JP2014070771A - Bath reheating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath reheating system capable of suppressing or preventing saprophyte propagation in a reheating circulation pipeline without impairing usability for a user when using hot water.SOLUTION: Control is started upon any one of completion of automatic bath control (Yes at S1), turning on of a cleansing switch (Yes at S2), and detection of rapid drainage at a rate higher than a predetermined rate (Yes at S3). Then, depending on hot water temperatures (piping temperatures) in pipes associated with hot water supply, cleansing is switched between pipe cleansing by injecting hot water as cleansing water into the reheating circulation pipeline (Yes at S4, S5), and pipe cleansing by injecting water (No at S4, S6). When the piping temperature is high, piping on the side of a water heater is also filled with hot water by injecting hot water. When the piping temperature is low, the piping on the side of the water heater is also filled with water by injecting water.

Description

  The present invention relates to a memorial system, and in particular, for memorial piping for chasing hot water in a bathtub, clean hot water is poured from the hot water supply device for cleaning after use of the bathtub to discharge residual water in the memorial piping. It is related to the technique for making it possible to suppress the propagation of miscellaneous bacteria.

  As a conventional technique, in Patent Document 1, in order to control a series of rinsing processes after the cleaning process, in the cleaning process, hot water in the bathtub is circulated in a circulation path by a circulation pump, and in the rinsing process, hot water in the bathtub is circulated. After discharging the water, normal temperature water is poured into the bathtub, and this water is circulated in the circulation path.

  Further, in Patent Document 2, a silver ion generator is provided in a pouring pipe for pouring water into a bathtub, and after all of the bath water has been discharged, hot water or water is circulated through the remedy circuit. It describes that silver ions having a high concentration (500 ppb or more) are mixed and dissolved in hot water or water from a silver ion generator to impart sterilization and antibacterial effects due to silver ions.

JP 2002-327957 A JP 2009-156470 A

  However, in the conventional memorial system, if silver ions are mixed / dissolved in hot water for cleaning, installation of the silver ion generator requires a considerably high cost, but some users may cause metal allergy. Conceivable. For this reason, it is necessary to be able to suppress the growth of germs by using hot water or water for cleansing without adding a sterilizing / antibacterial substance such as silver ions if possible.

  By the way, if the temperature in the remedy piping is maintained at a high temperature (for example, 35 ° C. to 40 ° C.), germs easily propagate in the remedy piping, so the temperature in the remedy piping is not used when the bathtub is not used. It may be desirable to maintain a lower temperature state. For this reason, it is considered that water is preferable to hot water as a target to be washed in the remedy pipe after use of the bathtub. For example, after using a bathtub for bathing, two kinds of water of 25 ° C. and 35 ° C. are poured into the memorial pipe and filled with each other, and the test is started for 24 hours. When the inventors investigated the growth rate of the bacteria after the lapse of time, when water at 25 ° C. was flowed, it slightly increased to 27 CFU / ml at the start of the test and 51 CFU / ml after 24 hours. In the case of flowing hot water at 35 ° C., it resulted in rapid growth of 27,700 CFU / ml after 24 hours from 27 CFU / ml at the start of the test.

  However, if water is used for washing and water is poured from the hot water supply device to the additional piping after using the bathtub, water will remain not only in the additional piping but also in the piping on the hot water supply side after cleaning. Become. In such a state, when the user opens the hot-water tap of the hot-water supply device and tries to use the hot-water supply, there is a concern that a situation in which the accumulated water first comes out from the hot-water tap and then hot water comes out. In other words, even though the user expects hot water at a set temperature to come out of the hot water tap, if the water comes out first, even if it is a small amount, there is a risk that the feeling of use for hot water use will be impaired. . In other words, it is desirable to inject water up to about 25 ° C into the memorial piping in order to suppress / prevent miscellaneous germs in the memorial piping, but doing so will impair the user's feeling in using hot water on the hot water supply side. May be incurred.

  The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to suppress and prevent the propagation of miscellaneous bacteria in the memorial pipe without impairing the user's feeling of using hot water.こ と に To provide a dredge system.

  In order to achieve the above object, in the invention according to claim 1, a recirculation circulation pipe comprising a hot water supply device, a bathtub, and a return path and a forward path connected to the bathtub to retreat hot water in the bathtub. And the following specific matters for a remedy system including a pipe cleaning control means for cleaning the inside of the remedy circulation pipe by flowing wash water from the hot water supply device into the remedy circulation pipe. did. That is, a pipe temperature sensor for detecting a hot water temperature of a portion related to hot water supply of the hot water supply apparatus is provided, and the temperature of the wash water is determined as the pipe cleaning control means according to the detected temperature detected by the pipe temperature sensor. The configuration is changed.

  In the case of the present invention, since the temperature of the washing water is changed according to the hot water temperature detected by the pipe temperature sensor, the temperature of the washing water is higher when the hot water temperature is higher, and the washing water is higher when the hot water temperature is lower. By changing the temperature of the water to be lower, even if the pipe cleaning is performed, the hot water of the same tendency as that before the pipe cleaning is filled in the portion related to the hot water supply of the hot water supply apparatus. As a result, even if hot water is used immediately after pipe cleaning, it is possible to avoid impairing the feeling of use without causing the user to feel uncomfortable with the use of hot water. Accordingly, it is possible to suppress / prevent propagation of germs in the memorial circulation pipe without impairing the user's feeling of using the hot water supply on the side of the hot water supply apparatus.

  In the invention which concerns on Claim 2, in order to chase the hot water supply apparatus, a bathtub, and the hot water in a bathtub, the memorial circulation piping which consists of the return path connected to the said bathtub, and an outward path, and this memorial circulation piping On the other hand, the following specific matters are provided for a remedy system provided with a pipe washing control means for washing the inside of the remedy circulation pipe by flowing washing water from the hot water supply device. That is, the outside air temperature sensor for detecting the outside air temperature is provided, and the pipe cleaning control means is configured to change the temperature of the washing water according to the detected temperature detected by the outside air temperature sensor.

  In the case of the present invention, since the temperature of the washing water is changed according to the detected temperature detected by the outside air temperature sensor, the washing water temperature is higher when the outside air temperature is low, and the washing water when the outside air temperature is high. By changing the temperature to a lower temperature, even if hot water is used immediately after pipe cleaning, it is possible to avoid impairing the feeling of use without causing the user to feel uncomfortable with the use of hot water. As a result, it is possible to suppress and prevent the propagation of various bacteria. In other words, in the low temperature period when the outside air temperature is low, the hot water of the hot water supply device is filled with hot water at a higher temperature, so that the user's feeling of use in hot water supply is enhanced, but more in the memorial circulation piping. It becomes possible to ensure the suppression of the growth of germs because the heat is released early and gets cold. On the other hand, in the high temperature period when the outside air temperature is high, it becomes possible to fill the memorial circulation piping with lower temperature water to ensure the suppression of the growth of miscellaneous bacteria. Can be filled with cooler water so as not to significantly impair the user's experience in hot water use.

  In the memorial system of the above invention, as the pipe cleaning control means, depending on the detected temperature, either cleaning water supplied to the hot water supply device or hot water heated to this cleaning water is used as the cleaning water. It can be configured to switch (claim 3). By doing in this way, it becomes possible to obtain the effect | action of this invention by more concrete and simple control.

  Further, in the memorial system of the present invention, as a pipe cleaning control means, it is determined whether or not the current time belongs to the night time zone, and if the current time belongs to the night time zone, the detection temperature depends on the detected temperature. Without changing the temperature of the washing water, it is possible to adopt a configuration in which the clean water supplied to the hot water supply device is poured into the remedy circulation piping as the washing water (claim 4). By doing in this way, there is almost no use of hot water at night such as late at night, and in the time zone when the interval until the next bathing is also considerably long, just a simple judgment is added, and the feeling of use in using hot water is reduced. It is possible to reliably execute pipe cleaning control that places greater emphasis on suppression of the growth of various bacteria than ensuring.

  Furthermore, in the remedy system of the present invention, a bath automatic operation control means for reheating through the remedy circulation pipe in order to maintain a constant temperature of the hot water filled in the bathtub is provided. The pipe cleaning control can be started upon completion of automatic bathing control by the automatic operation control means. By doing so, it is possible to grasp the start timing of pipe cleaning more reliably and execute pipe cleaning early.

  As described above, according to the remedy system according to the first aspect, the hot water temperature is higher when the hot water temperature is higher and the hot water temperature is lower according to the hot water temperature detected by the pipe temperature sensor. For example, by changing the temperature of the washing water to be lower, even if the pipe washing is performed, the hot water having the same tendency as that before the pipe washing can be filled in the portion related to the hot water supply of the hot water supply apparatus. As a result, even if hot water is used immediately after pipe cleaning, it is possible to avoid impairing the feeling of use without causing the user to feel uncomfortable with the use of hot water. Accordingly, it is possible to suppress / prevent propagation of germs in the memorial circulation pipe without impairing the user's feeling of using the hot water supply on the hot water supply apparatus side.

  According to the memory system according to claim 2, the temperature of the washing water is higher when the outside air temperature is low, and the temperature of the washing water is lower when the outside air temperature is high, according to the detected temperature detected by the outside air temperature sensor. By changing, even if hot water is used immediately after pipe cleaning, it is possible to avoid impairing the user's feeling of use without causing a sense of discomfort for the user to use hot water, and at the same time, breeding germs in the memorial circulation pipe Can be suppressed / prevented. In other words, in the low temperature period when the outside air temperature is low, the hot water of the hot water supply device is filled with hot water at a higher temperature, so that the user's feeling of use in hot water supply is enhanced, but more in the memorial circulation piping. Since it cools by releasing heat at an early stage, it becomes possible to guarantee the growth suppression of various germs. On the other hand, in the high temperature period when the outside air temperature is high, the inside of the memorial circulation piping can be filled with cooler water to ensure the suppression of the growth of germs, while for the part related to hot water supply of the water heater, Even if water with a low temperature is filled, it is possible to prevent a user's feeling of use in hot water supply from being greatly impaired.

  In particular, according to the remedy system of the third aspect, as the pipe cleaning control means, depending on the detected temperature, either clean water supplied to the hot water supply device or hot water heated from the clean water is used as the cleaning water. By configuring so as to switch between the two, the present invention can be made more specific and the effects of the present invention can be obtained by simple control.

  According to the remedy system of claim 4, the pipe cleaning control means determines whether or not the current time belongs to the night time zone. In addition, there is almost no use of hot water at night, such as late at night, with the configuration that the clean water supplied to the hot water supply device is poured into the recirculation piping without changing the temperature of the wash water. In the time zone when the interval until bathing becomes considerably long, it is possible to reliably execute pipe cleaning control that emphasizes the suppression of the growth of various bacteria rather than ensuring the feeling of use when using hot water supply, simply by making a simple judgment. it can.

  Further, according to the remedy system of claim 5, the tub automatic operation control means for retreating through the remedy circulation pipe in order to keep the temperature of the hot water filled in the bathtub constant, the pipe washing control means As described above, pipe cleaning control is started upon completion of automatic bath control by the automatic bath operation control means, so that the timing of pipe cleaning start can be grasped more reliably and pipe cleaning can be executed at an early stage. become.

It is a mimetic diagram of a memorial system concerning an embodiment of the present invention. It is a control block diagram which concerns on the operation control of the memorial system of FIG. It is a flowchart which concerns on the piping washing | cleaning control of 1st Embodiment. FIG. 2 is a diagram corresponding to FIG. 1, and shows a path through which cleaning hot water flows related to pipe cleaning control in bold lines. It is a flowchart which concerns on the piping washing | cleaning control of 2nd Embodiment. It is a flowchart which concerns on the piping washing | cleaning control of 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram of a memorial system according to an embodiment of the present invention. This remedy system includes a hot water supply device 2 that realizes a hot water supply function, a remedy device 3 that realizes a remedy function, and water injection or pouring for supplying hot water or water from the hot water supply device 2 to the remedy device 3 for hot water filling or the like. A hot water device 4 and a controller 5 for controlling the operation thereof are provided. In addition, although the thing of the figure has shown the thing of 1 can 2 water type, not only this but 2 can 2 water type thing can implement this invention. In addition, the example shown in the figure is configured as a latent heat recovery type as a heat exchanger that combines a primary heat exchanger that absorbs sensible heat of combustion gas and a secondary heat exchanger that recovers latent heat from combustion exhaust gas. Although the present invention is illustrated, the present invention is not limited to this, and the present invention can be carried out even without a secondary heat exchanger, and it is not essential to be a latent heat recovery type. In the following description, a combination of the primary heat exchanger and the secondary heat exchanger is simply indicated as a hot water supply heat exchanger 22 or a memorial heat exchanger 32.

  The hot water supply device 2 receives tap water or the like in the water supply passage 21 and causes the hot water supply heat exchanger 22 to discharge the hot water heated to a predetermined temperature by heat exchange heating with the combustion heat of the combustion burner 23 to the hot water supply passage 24. This hot water is supplied to the hot water taps 25 in various places such as a kitchen and a washroom. Between the water supply passage 21 and the hot water supply passage 24, a bypass passage 26 is provided to bypass the hot water supply heat exchanger 22 and allow the water supply from the water supply passage 21 to flow into the hot water supply passage 24, and the bypass valve 26a is opened. Communicate with each other. A flow rate sensor 27 and a feed water temperature sensor 28 for detecting the feed water temperature are interposed in the feed water passage 21, and a can outlet temperature for detecting the temperature of the hot water immediately after being heated by the hot water supply heat exchanger 22 in the hot water supply passage 24. A sensor 29 is interposed.

  The memorial device 3 includes a memorial circulation path 30 including a return path 30a and an outgoing path 30b piped between the bath 6 and the circulation adapter 61 in order to realize a chasing function. The stretched bath water can be reheated to a predetermined temperature and heated. That is, by the operation of the circulation pump 31, heat is exchanged by the heat of combustion of the combustion burner 33 in the reheating heat exchanger 32 from the bathtub 6 through the return path 30a, and the heated hot water is reheated. It is circulated so as to be supplied to the bathtub 6 and reheated to a predetermined boiling temperature. The circulation pump 31 is interposed in one of the return path 30a and the forward path 30b (return path 30a in the illustrated example). The return path 30a is provided with a water flow switch 34 that detects the flow and outputs it to the controller 5 described later, and a return temperature sensor 35 that detects the temperature of the bathtub hot water in the bathtub 6 returned by the return path 30a. A forward temperature sensor 36 for detecting the temperature of the bath water after reheating is interposed in the path 30b. Reference numeral 37 in FIG. 1 denotes a gas supply system for supplying fuel gas to the hot water supply combustion burner 23 and the combustion combustion burner 33.

  The water pouring / water pouring device 4 is provided with a pouring passage 41 that branches from the middle of the hot water passage 24 and is connected to the return passage 30 a of the recirculation circuit 30. Hot water (or water) flows into the return path 30a, and is divided into both sides to be poured into the bathtub 6 in a double-conveyance system that passes through the return path 30a and the outgoing path 30b. It can be stretched. The pouring channel 41 has a flow rate sensor 42, a pouring electromagnetic valve 43, a pair of check valves 44 for preventing backflow, and a backflow when negative pressure is generated on the upstream side in order from the upstream side that is the hot water supply channel 24 side. An edge cut-off valve 45 for preventing the generation is provided, and in addition, a pressure-type water level sensor 46 for detecting the water level in the bathtub 6 is provided in the vicinity of the junction with the tracking circuit 30.

  1 is an outside air temperature sensor, and this outside air temperature sensor 7 detects the outside air temperature by detecting the ambient temperature in the case. Reference numeral 8 denotes a drain processing device. The drain processing device 8 is a secondary heat exchanger included in the hot water supply heat exchanger 22 or the reheating heat exchanger 33. It is installed to collect drainage generated by cooling and condensing in exchange and draining it after, for example, neutralizing. That is, the drain treatment circuit 8 shown in the figure is configured to collect drainage from the neutralization tank 81 and the secondary heat exchangers included in the hot water supply heat exchanger 22 and the reheating heat exchanger 33 to neutralize the neutralization tank. A water collecting passage 82 that leads to 81 and a drainage passage 83 for draining the neutralized drain from the neutralization tank 81 to the outside of the system are configured.

  The hot water supply device 2, the renewal device 3 and the water / water pouring device 4 and the like are provided with an MPU, a memory, etc., and a controller 5 in which various control programs are stored. Based on the output from the remote controller 51 and the outputs from the various sensors described above, various operation controls such as hot water filling operation, automatic bathing operation that automatically controls hot water filling, memorialization, and heat retention, or pipe cleaning control, etc. It is supposed to be done. That is, as illustrated in FIG. 2, the controller 5 includes a hot water supply operation control unit 52, a bath automatic operation control unit 53, a pipe cleaning control unit 54, and the like.

  Hot water supply operation control by the hot water supply operation control unit 52 and automatic bathing control by the bath automatic operation control unit 53 will be briefly described. The hot water supply operation control is started when the user opens the hot water tap 25 and the flow sensor 27 detects a flow exceeding the minimum operating flow rate. First, the hot water supply combustion system including the hot water combustion burner 23 and the gas supply system 37 is controlled to be predetermined. In this combustion state, the supply water passing through the hot water supply heat exchanger 22 is subjected to heat exchange heating by receiving the combustion heat, and the hot water heated to the set temperature is supplied to the hot water tap 25 through the hot water supply passage 24. Will be. The bath automatic control is started when the user turns on the bath automatic switch of the remote controller 51. First, hot water from the hot water supply device 2 is filled in the bathtub 6 through the water pouring / hot water pouring device 4 and the additional circulation circuit 30. The The amount of hot water filling at this time is grasped and specified by integration of the water level sensor 46 or the pouring flow rate sensor 42, and the hot water is filled in the bathtub 6 to a predetermined water level. Next, the remedy combustion system including the remedy combustion burner 33 and the gas supply system 37 of the remedy device 3 and the circulation pump 31 are operated and controlled, and the remedy heat is received by receiving the combustion heat of the remedy combustion burner 33. The hot water in the bathtub 6 passing through the exchanger 32 is heat-exchanged and heated to a predetermined boiling temperature. When the remedy heating is finished, the set time (for example, 4 hours from the bath automatic switch ON) has elapsed for the heat insulation operation that intermittently performs the remedy control in order to keep the hot water temperature in the bathtub 6 constant. Until the bath automatic switch is turned off by the user.

<First Embodiment>
Next, a first embodiment of pipe cleaning control by the pipe cleaning control unit 54, which is a characteristic part, will be described with reference to FIG. Here, the pipe to be cleaned by the pipe cleaning control is the above-described recirculation circuit 30 (return path 30a and forward path 30b connecting the bathtub 6 and the heat exchanger 32 for renewal). That is, hot water (sewage) in the bathtub 6 that contains sebum and dirt on the body surface and the like by human bathing enters and stays in the memorial circuit 30 by memorial operation and heat insulation operation. Therefore, by flowing clean hot water or water into the memorial circuit 30, the hot water in the bathtub 6 remaining as residual water after use of the bathtub is pushed out into the bathtub 6 and drained. Then, the inside of the memorial circuit 30 is replaced with the clean hot water or water, thereby suppressing and preventing the propagation of miscellaneous bacteria.

  First, if the automatic bath control has been completed (YES in step S1), or if the pipe cleaning switch of the remote controller 51 has been turned ON by the user's ON operation (YES in step S2), the wastewater detection in step S3. The determination (determination of a rapid water level drop) is skipped, and piping control after step S4 is immediately started. On the other hand, if the automatic bath control has not ended (NO in step S1), or if the pipe cleaning switch remains OFF (NO in step S2), the process proceeds to step S3 to perform drainage detection determination. The drainage detection determination is to determine whether or not the hot water in the bathtub 6 has started to drain, for example, a predetermined head (for example, 2 cm) within a predetermined short time (for example, 2 minutes) from a predetermined reference water level +2 cm water level. If the water level drops by the amount of the head), it is determined that the wastewater has been detected. If it is not determined that the wastewater is detected (NO in step S3), the process returns to step S1 and the determinations in steps S1 to S3 are repeated. If it is determined that drainage is detected due to the sudden drop in the water level (YES in step S3), then the current pipe temperature is checked (step S4), and depending on how this pipe temperature is used, It is determined whether the pipe is washed (step S5) or the pipe is washed with water (step S6). The piping temperature here refers to the temperature in the hot water supply passage 24 and is grasped from the temperature detected by the can outlet temperature sensor 29.

  The principle of the above-described steps S4 to S6 is that if hot water supply passage 24 is hot water, hot water is supplied for cleaning, while if hot water supply passage 24 is water, water is supplied for cleaning. In this case, the temperature that remains in the substrate is set to the same temperature as before cleaning. Thereby, while performing washing on the side of the memorial circuit 30, the state in the hot water supply passage 24 after washing is made to be the same state as before washing, so that even if hot water use occurs, the user can use it. Try not to lose the feeling. Specifically, it is determined in step S4 whether or not the pipe temperature, which is the temperature detected by the can outlet temperature sensor 29, is equal to or higher than the set temperature Th (YES in step S4). The hot water solenoid valve 42 is opened and the hot water supply combustion burner 23 is combusted, and a predetermined amount (for example, set temperature) of hot water is poured into the recirculation circuit 30 through the water / water pouring device 4 by a predetermined amount (for example, 7 L). Hot water is supplied (step S5). On the other hand, if the temperature is lower than the set temperature Th (NO in step S4), the hot water supply combustion burner 23 is maintained in the non-combustion state, the hot water solenoid valve 42 is opened, and water is being supplied to the water supply passage 21 at present. A predetermined amount (for example, 7 L) of water is poured into the remedy circuit 30 through the water / water pouring device 4 without being heated by the hot water supply heat exchanger 22 (step S6). As the set temperature Th, for example, a value obtained by adding α (for example, 15 ° C.) to the water supply temperature to the water supply channel 21 may be set (Th = water supply temperature + α).

  The hot water poured in step S5 (see the thick line in FIG. 4) or the water poured in step S6 is divided into the return path 30a and the forward path 30b of the memorial circuit 30 and flows into the bathtub 6. Become. As a result, the sewage that has been convected in the remedy circulation path 30 is pushed out to the bathtub 6 by pouring or pouring water, and the hot water or water poured in place of the sewage is filled in the remedy circulation path 7. It will be replaced with sewage. Thereby, the cleaning of the memorial circuit 30 is completed. At the same time, the poured water or the poured hot water is filled and convected in the hot water supply path 24 in the same manner as the memorial circuit 30. For this reason, even if a user uses hot water supply immediately afterward, the user's usability in using hot water supply is not impaired.

  That is, even when the user opens the hot-water tap 25, the water or hot water that fills the hot-water supply path 24 first comes out of the hot-water tap 25, and then hot water having a set temperature that is hot-watered by the hot-water supply operation control unit 52. Will come out. In other words, if the pipe temperature is equal to or higher than the set temperature Th, the hot water supply has been used a little while ago, so that it can be determined that hot water at a predetermined temperature or more is staying in the hot water supply path 24. It is thought that if the user opens the water tap, the hot water will be discharged first. Therefore, by performing the pouring of the above-described step S5, the hot water supply passage 24 is filled with the hot water of the pouring hot water, and this will come out from the hot water tap 25 first when the next hot water is used. The hot water supply can be used comfortably without feeling uncomfortable. For this reason, under such conditions, the user's feeling of using the hot water supply is emphasized, hot water is poured for cleaning the memorial circuit 30 and the hot water supply passage 24 is filled with hot water. On the other hand, if the pipe temperature is lower than the set temperature Th, the hot water supply is not used for a while, so the hot water staying in the hot water supply passage 24 is also dissipated and becomes low temperature. Even if the user opens the hot-water tap and water comes out first, the user will not feel uncomfortable. For this reason, in such a case, emphasis is placed on suppressing the growth of germs in the memorial circuit 30 and water is poured for cleaning the memorial circuit 30. As a result, the inside of the memorial circuit 30 is surely filled with water at 25 ° C. or lower, and the growth of germs can be reliably suppressed / prevented. In steps S5 and S6, if the automatic drain plug 62 is provided in the bathtub 6, the automatic drain plug 62 is also switched to open simultaneously with pouring or water injection.

Second Embodiment
A second embodiment of the pipe cleaning control by the pipe cleaning control unit 54 will be described with reference to FIG. In the second embodiment, instead of determining the temperature condition in step S4 (see FIG. 3) of the first embodiment, it is determined whether the current outside air temperature (season) is present (see step S14 in FIG. 5). By switching between hot water and water injection, as in the first embodiment, washing for suppressing and preventing the growth of germs in the memorial circuit 30 is reliably performed without impairing the user's feeling of using hot water. It is what you want to do. Except for the determination in step S14, other controls are the same as in the first embodiment.

  First, if the automatic bath control has been completed (YES in step S11), or if the pipe cleaning switch of the remote controller 51 has been turned ON by the user's ON operation (YES in step S12), the wastewater detection in step S13. By skipping the determination (determination of a rapid water level decrease), the pipe control immediately after step S14 is started. On the other hand, if the automatic bath control has not ended (NO in step S11), or if the pipe cleaning switch remains OFF (NO in step S12), the process proceeds to step S13 and is described in the first embodiment. The same drainage detection determination is performed. If it is not determined that the wastewater is detected (NO in step S13), the process returns to step S11 again and the determinations in steps S11 to S13 are repeated. If it is determined that drainage is detected due to the sudden drop in the water level (YES in step S13), then the current outside air temperature is checked (step S14). It is determined whether the pipe is washed (step S15) or the pipe is washed by water injection (step S16). The outside air temperature here is grasped by the temperature detected by the outside air temperature sensor 7.

  In step S14, it is determined based on the temperature detected by the outside air temperature sensor 7 whether the current time is in a low temperature period (winter period or the like) or a high temperature period (summer period or the like). That is, if it is below determination temperature Ts (for example, 25 degreeC) (it is YES at step S14), it will determine with the present season being a low temperature period, and will perform piping washing | cleaning by pouring similarly to step S5 of 1st Embodiment. (Step S15). Conversely, if the outside air temperature is higher than the determination temperature Ts (NO in step S14), it is determined that the current season is in the high temperature period, and pipe cleaning by water injection is performed in the same manner as in step S6 of the first embodiment ( Step S16). At present, since the temperature is low and the temperature is low, the temperature of the accumulated water in the memorial circuit 30 is quickly lowered, and therefore, it is considered that germs hardly propagate in the memorial circuit 30. In other words, because the user is sensitive to temperature changes during the use of hot water supply because of the low temperature period when the air temperature is low, priority is given to the feeling of use of hot water supply and hot water is filled in the hot water supply path 24. Therefore, the pipe is washed by pouring in step S15. In other words, even if hot water is poured for washing the memorial circuit 30, the hot water filled in the memorial circuit 30 is lowered in temperature at an early stage and the proliferation of various bacteria is suppressed. Inconvenience does not occur. On the other hand, in the high temperature period when the temperature is high, it is an environment in which miscellaneous bacteria are likely to proliferate. It is done. For this reason, in the high temperature period, priority is given to suppression / prevention of the growth of miscellaneous bacteria in the memorial circuit 30 by performing pipe cleaning (step S16) by pouring water instead of pouring.

<Third Embodiment>
A third embodiment of pipe cleaning control by the pipe cleaning control unit 54 will be described with reference to FIG. In the third embodiment, before the temperature condition is determined in step S4 (see FIG. 3) of the first embodiment, it is determined whether the current time zone is daytime or nighttime (see step S24 in FIG. 6). In the daytime, switching between hot water injection or water injection is performed according to the same pipe temperature as in the first embodiment, and in the nighttime, the pipe cleaning by the water injection is immediately executed without determining whether the pipe temperature. It is what I did. Except for these points, other controls are the same as in the first embodiment. Note that the process of switching according to whether it is daytime or nighttime in step S24 of this embodiment is performed before any determination of the outside air temperature of the second embodiment (step S14 in FIG. 5). Also good.

  Specifically, first, if the automatic bath control has been completed (YES in step S21), or if the pipe cleaning switch of the remote controller 51 has been turned ON by the user's ON operation (YES in step S22). By skipping the drainage detection determination (determination of abrupt water level drop) in step S23, pipe control after step S24 is immediately started. On the other hand, if the automatic bath control has not ended (NO in step S21), or if the pipe cleaning switch remains OFF (NO in step S22), the process proceeds to step S23, and is described in the first embodiment. The same drainage detection determination is performed. If it is not determined that the wastewater is detected (NO in step S23), the process returns to step S21 again and the determinations in steps S21 to S23 are repeated. If it is determined that the water level has been drastically reduced and the drainage is detected (YES in step S23), it is then determined whether or not the current time zone is daytime (step S24). This time zone determination may be performed based on an electronic timepiece or the like built in the controller 5.

  If the current time is determined to be daytime (YES in step S24), the current piping temperature status is observed as in the first embodiment (step S25). Depending on the pipe temperature, it is determined whether the pipe is cleaned by pouring (step S26) or the pipe is cleaned by pouring (step S27). Conversely, if it is determined in step S24 that it is not daytime, pipe cleaning by water injection is immediately performed without determining the pipe temperature status in step S25 (NO in step S24, step S27). In other words, at night (midnight), the frequency of user bathing is not so high, the interval between bathing is relatively long, and the frequency of hot water usage is considered to be considerably low. Thus, the temperature in the memorial circuit 30 is kept lower to suppress / prevent proliferation of various germs.

<Other embodiments>
The present invention is not limited to the first to third embodiments, but includes other various embodiments. That is, a temperature other than the set temperature may be set as the pouring temperature in pipe cleaning by pouring in the first to third embodiments. In addition, the water injection temperature in the pipe washing by water injection is heated within a temperature range in which, for example, 25 ° C. is the upper limit temperature, which can be expected to suppress the growth of germs, depending on the temperature of water supplied to the water supply channel 21 It may be. That is, for example, in the low temperature period, the feed water temperature is in a low temperature state of 5 to 10 ° C., so that it is slightly heated within the temperature range with the upper limit of 25 ° C. You may make it inject water as water used for piping washing | cleaning in step S16 of embodiment, or step S27 of 3rd Embodiment. Thereby, it becomes possible to further improve the user's feeling of using hot water while suppressing / preventing the growth of germs in the memorial circuit 30.

  In any of the first to third embodiments, if the automatic bath control is complete (YES in steps S1, S11, or S21), the drainage detection determination in steps S3, S13, or S23 is skipped. The pipe control immediately after step S4, S14, or S24 is started. However, the present invention is not limited to this, and if the automatic bath control is finished, the drainage of step S3, S13, or S23 is performed. You may make it start piping control after step S4, S14, or S24 after determining detection.

  In the second embodiment, it is determined whether hot water or water is used as the cleaning water for the subsequent pipe cleaning by determining whether the present is the high temperature period or the low temperature period based on the temperature detected by the outside air temperature sensor. However, for example, the season may be determined more finely, such as in the high temperature period, the low temperature period, or in the spring / autumn period. In this case, the clean water supplied as cleaning water itself, slightly heated water of 25 ° C. or lower, or Alternatively, the hot water heated to a temperature higher than 25 ° C. may be switched in multiple stages. In the third embodiment, instead of determining the pipe temperature in step S25, the outside air temperature in step S14 may be determined as in the second embodiment, and switching based on the outside air temperature determination may be applied. . Furthermore, in the third embodiment, the current time zone is determined based on an electronic timepiece built in the controller 5, but the present invention is not limited to this, and the time (time zone) for the user to switch the time zone using the remote controller 51 or the like. The switching time for determination) may be changed and set, or the daily usage state of the user is learned by the controller 5, and the switching time for time zone determination is automatically set based on the learning result. Alternatively, the switching setting may be made automatically.

  Further, in the first embodiment or the third embodiment, instead of the temperature detected by the can outlet temperature sensor 29, the temperature detected by the temperature sensor installed at another position of the hot water supply channel 24 is used as the piping temperature. It may be. Furthermore, when performing pipe cleaning by water injection, water supplied from the water supply path 21 may be supplied to the water injection / hot water supply apparatus 4 through the bypass path 26.

2 Hot water supply device 3 Remembrance device 4 Water injection / pour water injection device 5 Controller (pipe cleaning control means)
6 Bath 7 Outside air temperature sensor 29 Can body outlet temperature sensor (pipe temperature sensor)
30 memorial circuit (memorial circulation piping)
31 Circulation pump 53 Automatic bath operation control unit (automatic bath operation control means)
54 Piping washing control section (piping washing control means)

Claims (5)

A hot water supply device, a bathtub, a supplementary circulation pipe composed of a return path and a forward path connected to the bathtub to replenish hot water in the bathtub, and wash water from the hot water supply apparatus to the supplementary circulation pipe In the memorial system provided with the pipe cleaning control means for cleaning the inside of the memorial circulation pipe by pouring,
A pipe temperature sensor for detecting a hot water temperature of a part related to hot water supply of the hot water supply device;
The pipe cleaning control means is configured to change the temperature of the cleaning water according to a detected temperature detected by the pipe temperature sensor.
A memorial system characterized by this. A hot water supply device, a bathtub, a supplementary circulation pipe composed of a return path and a forward path connected to the bathtub to replenish hot water in the bathtub, and wash water from the hot water supply apparatus to the supplementary circulation pipe In the memorial system provided with the pipe cleaning control means for cleaning the inside of the memorial circulation pipe by pouring,
It has an outside air temperature sensor that detects outside air temperature,
The pipe cleaning control means is configured to change the temperature of the cleaning water according to a detected temperature detected by the outside air temperature sensor.
A memorial system characterized by this. The memorial system according to claim 1 or 2,
The pipe cleaning control means is configured to switch between clean water supplied to the hot water supply device or hot water heated from the hot water as the cleaning water, depending on the detected temperature. , Memorial system. A memorial system according to any one of claims 1 to 3,
The pipe cleaning control means determines whether the current time belongs to the night time zone, and if the current belongs to the night time zone, without changing the temperature of the cleaning water according to the detected temperature, A remedy system configured to flow clean water supplied to the hot water supply apparatus into the remedy circulation pipe as cleaning water. A memorial system according to any one of claims 1 to 4,
In order to keep the temperature of the hot water filled in the bathtub constant, it comprises a bath automatic operation control means for reheating through a recirculation circulation pipe,
The pipe cleaning control means is configured to start pipe cleaning control upon completion of automatic bathing control by the bath automatic operation control means.

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