JP4035554B2 - Bathtub water filtration device - Google Patents

Description

  The present invention relates to a bathtub water filtration device that circulates and purifies water in a bathtub, and in particular, means capable of thermally sterilizing a filtration tank by flowing hot water at a predetermined temperature or more into a filtration tank provided in the apparatus. It is related with the bathtub water filtration apparatus provided with.

  Conventionally, there is a bathtub water filtration device that circulates and filters water in a bathtub (hereinafter referred to as bathtub water). The bathtub water is guided to the circulation path of the bathtub water filtration device, passes through the filtration tank provided in the circulation path, is purified by the filtration tank, and then returned to the bathtub.

  This filter tank is made of, for example, a filter that captures hair or dust circulating with the bath water, or a filter medium such as activated carbon for adsorbing human sweat, fat, or other organic matter such as ammonia contained in hot water. I have.

In this way, the bathtub water circulating in the circulation path is purified by passing through the filtration tank provided in the circulation path and returned to the bathtub again. Adhesion of scale is prevented, and the inside of the bathtub can be maintained hygienically. Such a filtration tank is described in the following prior art.
Japanese Patent Laid-Open No. 04-7007 Japanese Patent Laid-Open No. 02-275241 Japanese Utility Model No. 02-38043 microfilm

  On the other hand, since garbage and organic matter captured and adsorbed by filtration adhere to the filtration tank, various germs easily propagate there. Among miscellaneous bacteria, there are malignant bacteria having harmful effects on the human body, such as Legionella spp., So it is necessary to periodically sterilize the filtration tank and maintain it hygienically. The filter tank is generally sterilized by chemicals such as chlorine or heat sterilized by hot water.

  In order to perform sterilization treatment with chemicals, specialized knowledge is required for handling chemicals such as chlorine, and the cost of the chemicals is high, so that maintenance is troublesome.

  The heat sterilization treatment of the filtration tank is performed by passing hot water having a temperature equal to or higher than the predetermined temperature supplied to the circulation path from an external hot water generating means connected to the circulation path of the bathtub water filtration device. At this time, conventionally, the hot water used for the heat sterilization has been drained after the heat sterilization.

  However, since this hot water is hot water used for sterilization treatment, no germs are propagated in the hot water, and it is inherently sanitary hot water. Therefore, draining hot water used for sterilization is not preferable from the viewpoint of energy saving and water saving, and is also contrary to the purpose of energy saving and water saving, which are the purposes of the bathtub water filtration device.

  Then, the objective of this invention is providing the bathtub water filtration apparatus which can reuse the hot water utilized for the heat sterilization to the hot water of a bathtub.

  Furthermore, an object of the present invention is to provide a bathtub water filtration device that makes it possible to raise or keep the temperature of hot water in a bathtub by using the amount of heat used for thermal sterilization by returning the hot water used for heat sterilization into the bathtub. It is to provide.

  Furthermore, the object of the present invention is to return the hot water used for heat sterilization into the bathtub so that the temperature of the bathtub greatly exceeds the set temperature, or the bathtub becomes full and the hot water overflows. It is in providing the bathtub water filtration apparatus which can prevent.

  In order to achieve the above object, the present invention first heats the filtration tank by flowing hot water having a temperature higher than that necessary for heat sterilization generated by the hot water generating means to the filtration tank for the time required for heat sterilization. Sterilize. And when the bathtub temperature when the hot water flowing through the filtration tank is returned to the bathtub is within the vicinity of the set temperature, the hot water is returned to the bathtub and used for raising the temperature of the bathtub. Alternatively, high-temperature hot water in such an amount that the temperature of the bathtub does not exceed the vicinity of the set temperature is poured into the filtration tank and returned to the bathtub. The hot water exceeding that temperature is drained to prevent the bath temperature from becoming excessively high.

  2ndly, this invention returns the said hot water to a bathtub, and uses it as additional hot water, when the bathtub does not become full when the hot water utilized for heat sterilization is returned to a bathtub. Alternatively, an amount of hot water that does not fill the bathtub is poured into the filtration tank and returned to the bathtub. The hot water that exceeds that temperature is drained to prevent the bathtub from becoming full and overflowing.

  Third, when the bathtub temperature when the hot water flowing through the filtration tank is returned to the bathtub exceeds the set temperature, the hot water that has passed through the filtration tank is cooled or mixed with cold water. Return to the bathtub. As a result, the temperature of the bathtub can be prevented from becoming excessively high.

  The present invention has a circulation path whose both ends are connected to a bathtub and circulates water in the bathtub, a filtering means provided in the circulation path, and hot water generating means for supplying hot water to the circulation path, In a bathtub water filtration apparatus for performing heat sterilization of the filtering means by exposing the filtering means to high temperature hot water having a temperature necessary for heat sterilization supplied from the hot water generating means, the high temperature hot water supplied from the hot water generating means When the bath temperature when the filtering means is passed for the time necessary for sterilization and the high temperature hot water passed through the bath is not exceeded the set temperature or the vicinity thereof, the high temperature hot water passed through It is characterized by injecting.

  Furthermore, the present invention has a circulation path whose both ends are connected to the bathtub and circulates the water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path. In a bathtub water filtration device that performs thermal sterilization of the filtering means by exposing the filtering means to high-temperature hot water having a temperature necessary for thermal sterilization supplied from the hot water generating means, the hot water generating means supplies the When the hot water in the bathtub does not overflow when the filtered hot water is passed through the hot water for a time necessary for sterilization and the hot water passed through the hot water is poured into the bathtub, the hot water passed through is poured into the bathtub. It is characterized by.

  Furthermore, the present invention has a circulation path whose both ends are connected to the bathtub and circulates the water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path. In a bathtub water filtration device that performs thermal sterilization of the filtering means by exposing the filtering means to high-temperature hot water having a temperature necessary for thermal sterilization supplied from the hot water generating means, the hot water generating means supplies the The high temperature hot water is allowed to pass through the filtering means for the time required for sterilization, and the hot water that has passed is poured into the bathtub within a range where the bath temperature does not exceed the set temperature or the vicinity thereof.

  Furthermore, the present invention has a circulation path whose both ends are connected to the bathtub and circulates the water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path. In a bathtub water filtration device that performs thermal sterilization of the filtering means by exposing the filtering means to high-temperature hot water having a temperature necessary for thermal sterilization supplied from the hot water generating means, the hot water generating means supplies the The high temperature hot water is allowed to pass through the filtering means for a time required for sterilization, and the hot water passed through the hot water is poured into the bathtub as long as the hot water in the bathtub does not overflow.

  Furthermore, the present invention has a circulation path whose both ends are connected to the bathtub and circulates the water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path. In a bathtub water filtration device that performs thermal sterilization of the filtering means by exposing the filtering means to high-temperature hot water having a temperature necessary for thermal sterilization supplied from the hot water generating means, the hot water generating means supplies the The high temperature hot water is passed through the filtering means for a time required for sterilization, and the high temperature hot water that has passed is cooled and poured into the bathtub.

  In said invention, the hot water which passed the filtration tank can be returned to a bathtub so that the temperature of a bathtub may not become high too much. Furthermore, it can return so that hot water may not overflow from a bathtub.

  As described above, according to the present invention, high-temperature hot water necessary for heat sterilization from an external hot water supply means can be supplied to the circulation path provided with the filter tank, and the filter tank can be heat-sterilized. The hot water for sterilization can be returned to the bathtub so that the bathtub temperature does not exceed the set temperature or the hot water does not overflow from the bathtub. Therefore, an energy-saving and water-saving bathtub water filtration device can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to the embodiment.

  FIG. 1 is a configuration diagram of a bathtub water filtration device according to an embodiment of the present invention. According to FIG. 1, both ends of a circulation path 20 through which bathtub water circulates are connected to the bathtub 10, and the bathtub water drawn from one end 20 a of the circulation path 20 is circulated by a pump 21 provided in the circulation path 20. It flows in the direction of arrow A in the channel 20 and is injected into the bathtub 10 again from the other end 20b of the circulation channel 20. The circulation path 20 on the downstream side of the pump 21 is provided with a filtration tank 22 for filtering the circulating water and a temperature sensor 23 for detecting the temperature of the water flowing out from the filtration tank 22. In addition, a heater 24 for heating the circulating water and a water amount sensor 25 for detecting the amount of the circulating water are provided in the circulation path 20.

  Further, a three-way valve K and a four-way valve M are provided in order in the circulation direction A in the circulation path 20 downstream from the pump 21 and upstream from the filtration tank 22, and further downstream from the temperature sensor 23. A four-way valve Y is provided in the circulation path 20.

  Moreover, the bathtub water filtration apparatus of the present embodiment includes a control unit (not shown) such as a microcomputer, and the filtration operation and the heat sterilization process described below are performed under the control of the control unit. .

  In the bathtub water filtration device, when the bathtub water is filtered by a normal filtration operation, the water that has passed through the pump 21 flows from the inlet / outlet 1 of the three-way valve K to the inlet / outlet 2, and from the inlet / outlet 1 of the four-way valve M to the inlet / outlet 2. Through the filter tank 22. The hot water flowing through the filtration tank 22 flows out of the filtration tank 22 as purified hot water from which dust and organic substances are removed by the filtering material in the filtration tank 22. And the hot water purified through the filtration tank 22 is returned to the bathtub 10 through the inlet / outlet 2 from the inlet / outlet 1 of the three-way valve Y. Moreover, the hot water flowing through the circulation path is heated by the heater 24, and the hot water in the bathtub is kept near the set temperature.

  Moreover, the bathtub water filtration apparatus in this Embodiment is provided with the reverse washing circuit 30 for washing away the dust etc. which adhere to the filtration tank 22 when bathtub water flows through the filtration tank 22 as mentioned above, and discharging | emitting. . When the filtration tank 22 is washed using the back washing circuit 30, first, the flow path in the four-way valve M is set in the direction from the inlet / outlet 1 to the inlet / outlet 4, and hot water flowing through the circulation path 20 is guided to the back washing circuit 30. . And the hot water which flows through the back washing circuit 30 in the arrow B direction flows from the inlet / outlet 4 of the three-way valve Y to the inlet / outlet 1 and flows into the filter tank 22 in the arrow C direction. And, when hot water flows in the opposite direction (arrow C) to the normal circulation direction (arrow D) for purifying the bathtub water in the filter tank 22, dust attached to the filter tank 22 is washed, It flows out from the filtration tank 22 in the direction of arrow C. At this time, the flow path of the four-way valve M is set in the direction from the inlet / outlet 2 to the inlet / outlet 3 of the four-way valve M, and hot water flowing out from the filtration tank 22 passes through the inlet / outlet 3 from the inlet / outlet 2 of the four-way valve M to the drainage channel. 31 is drained.

  By such backwashing in which the water in the opposite direction (arrow C) flows into the filtration tank 22 to wash the filtration tank 22, most of the dust and organic matter adhering to the filtration tank 22 is removed. The malignant bacteria that have propagated in are not removed. Therefore, the bathtub water filtration apparatus according to the present embodiment further includes a hot water heat source 40 that is a hot water generating means for supplying hot water for heat sterilizing these malignant bacteria to the filtration tank 22. Is provided.

  Hot water (hereinafter referred to as sterilizing hot water) of a predetermined temperature (for example, 65 ° C.) or higher necessary for heat sterilization generated by the hot water heat source device 40 passes through the hot water supply path 41 provided with the open / close valve V to the circulation path 20. Supplied. The hot water supply path 41 is connected to the inlet / outlet 3 of the three-way valve K, and hot water flowing into the hot water supply path 41 is supplied from the inlet / outlet 3 of the three-way valve K through the inlet / outlet 2 into the circulation path 20. The sterilizing hot water flowing out from the inlet / outlet 2 of the three-way valve K flows through the inlet / outlet 2 of the four-way valve M through the inlet / outlet 2 in the filtration tank 22. And, for a predetermined time required for heat sterilization (for example, when the hot water temperature is 65 ° C. or higher, for example, 10 minutes or longer), hot water for sterilization continues to be supplied from the hot water heat source unit 40 and the filter tank 22 is exposed to the hot water for sterilization. As a result, the filter tank 22 is sterilized.

  Here, conventionally, since the flow path of the four-way valve Y is set in the direction from the inlet / outlet 1 to the inlet / outlet 3 at the time of the heat sterilization treatment, the sterilizing hot water flowing out from the filtration tank 22 passes through the drainage channel 31 and is drained. It had been. However, as described above, the sterilizing hot water that has flowed through the filter tank 22 is hot water that does not have any sanitary problems, so it is not preferable to drain it from the viewpoint of energy saving and water saving.

  Therefore, in the embodiment of the present invention, during the heat sterilization treatment, the flow path of the four-way valve Y is set in the direction from the inlet / outlet 1 to the inlet / outlet 2 which is the same as the normal filtration operation. The hot water for sterilization used for sterilization is poured into the bathtub 10 without being drained. As a result, the sterilizing water can be reused as bath water, and water saving is achieved. And since new hot water is supplied to the bathtub 10, it is not necessary to add hot water, and a user's load (manual pouring) can be reduced. Moreover, since hot water having a temperature higher than a set temperature of general bath water (near 42 ° C.) is supplied, energy for heat retention is saved, and it can contribute to energy saving.

  By the way, as above-mentioned, when returning the sterilizing hot water utilized for heat sterilization to a bathtub to a bathtub, it is necessary to consider two things. First, sterilizing hot water is 65 ° C., which is higher than a normal set temperature (for example, 42 ° C.), and therefore simply returning to the bathtub may cause the temperature of the bathtub to exceed the set temperature or the vicinity thereof. Secondly, when the hot water generated in the hot water heat source unit 40 provided outside the circulation path 20 connected to the bathtub is returned to the bathtub, when the amount of water in the bathtub is large, the injected sterilizing hot water is the bathtub. May overflow.

  Considering these two problems, a method for returning the sterilizing hot water to the bathtub will be described in the following embodiment.

[First Embodiment]
FIG. 2 is a flowchart of the first embodiment. In the example of FIG. 2, before the heat sterilization process starts, the filtration tank 22 is back-washed while the hot water temperature from the hot water heat source unit 40 rises to a temperature necessary for sterilization. When the sterilizing water is allowed to flow into the filter tank 22 for the time required for sterilization after the sterilization temperature is reached, when the sterilizing water is returned to the bathtub and within the set temperature vicinity, the four-way valve Y is set to 1- When the temperature of the bathtub exceeds the set temperature, the four-way valve Y is set at the position of 1-3 and led to the drainage channel 31.

  Further, when the sterilizing water is returned to the bathtub, the bathtub does not become full, that is, when it does not overflow, the four-way valve Y is set to the 1-2 position and returned to the bathtub. The four-way valve Y is set to the position 1-3 and guided to the drainage channel 31.

  This will be described with reference to FIG. First, in step S10, it is a filtration operation in which bathtub water is circulated through the circulation path 20 and filtered in a filtration tank. That is, the valve K is set to the 1-2 position, the valve M is set to the 1-2 position, the valve Y is set to the 1-2 position, the valve V is closed, and the heater 24 is turned off. In this state, the pump 21 is driven, and the bathtub water circulates in the circulation path and is filtered in the filter tank.

  When the bath temperature TB becomes lower than the set temperature Ts (S11), the heater 24 is turned on (S12), and the heat retaining step is performed. In this heat retention step, the amount of water WB in the bathtub is calculated from the amount of heat input from the heater 24 and the change in the bathtub temperature TB. When the amount of water WB in the bathtub is obtained, the bathtub temperature Tx when the sterilizing hot water is returned to the bathtub later in the heat sterilization step can be obtained (S13). Or when hot water for sterilization is returned to a bathtub, it can be known whether hot water overflows from a bathtub.

  FIG. 3 is a graph showing changes in the temperature of the bathtub when the sterilizing water is returned to the bathtub. The example here shows the change in the temperature of the bathtub when the hot water at 65 ° C. is returned to the bathtub for 10 minutes at 5 liters per minute, divided by the amount of water in the bathtub. The above calorific value calculation is shown in a graph. For example, when the bath water amount is 180 liters and the bath temperature before thermal sterilization is 38 ° C., when the sterilizing water of 65 ° C. and 50 liters is returned to the bathtub, the bath temperature becomes 44 ° C. Therefore, since it is below the set temperature (42 ° C. + 2 ° C.) or lower, returning the sterilizing hot water to the bathtub is permitted.

  Eventually, the heat sterilization signal is instructed by the user from a remote controller (not shown), for example, or the timer of the control unit is timed up to automatically instruct heat sterilization (S14). At that time, when the heater 24 is on, the calculated bathtub water amount WB and bathtub temperature Tx are the latest values and can be used. However, when the heater 24 is off, the heater 24 is turned on again just in case. (S16), the bath water amount and the bath temperature Tx are calculated again (S17).

  Then, heating of the hot water heat source unit 40 is started, and the supplied hot water is caused to flow through the filtration tank 22 in the direction of the arrow C via the back washing path 30, and back washing is performed (S18). While the hot water from the hot water heat source unit 40 does not exceed the temperature required for heat sterilization, the hot water cannot be used as sterilizing hot water, and is used for back washing and drained from the drainage channel 31.

  Eventually, when the supplied hot water reaches a temperature required for heat sterilization (for example, 65 ° C.) (S19), the heat sterilization process is started. At that time, when the sterilizing hot water used for heat sterilization, for example, 65 ° C. hot water is flowed to the filter tank 22 at 5 liters per minute for 10 minutes, and the sterilizing hot water is returned to the bathtub, the bath temperature A check is made as to whether Tx does not exceed a preset temperature, for example, Ts + 2 ° C. (S20), or a check is made as to whether the bathtub is full (S21). And when satisfy | filling any conditions, the valve M is set to the position of 1-2, the valve Y is set to the position of 1-2, respectively, so that the hot water for sterilization flowed to the filtration tank 22 may be returned to the bathtub 10. (S22). If any of the conditions is not satisfied, the valve Y is set to the position 1-2, and the sterilizing hot water flowing through the filtration tank 22 is guided to the drainage channel 31 (S24).

  Then, the heat sterilization timer Tn starts counting (S23), and the filtration tank 22 is exposed to high-temperature sterilizing water for the time required for heat sterilization. In this example, it is exposed for 10 minutes. Eventually, when 10 minutes have passed (S25), the valve V is closed, the valve K is set to the 1-2 position, the valve Y is set to the 1-2 position, and the circuit is switched to the circuit for normal filtration operation ( S26).

  As a modification of the first embodiment described above, when the heat sterilization signal is received in step S14, the bath temperature Tx is within the vicinity of the set temperature when the sterilization water is poured into the baths in steps S20 and S21. Check whether or not it is full, and if both conditions are satisfied, perform the heat sterilization process of step S15 and below, and if either condition is not satisfied, cancel the heat sterilization process itself You can also wait for a certain time. In this case, hot water used for heat sterilization can always be poured into the bathtub, and energy saving and water saving can be realized.

[Second Embodiment]
FIG. 4 is a flowchart of the second embodiment. In the first embodiment, after receiving the heat sterilization signal, when the hot water temperature from the hot water heat source unit 40 reaches 65 ° C., when the hot water used for heat sterilization is returned to the bathtub, When it exceeded the preset temperature, or when the bathtub was full, it was drained without returning the sterilizing water to the bathtub. On the other hand, in the second embodiment, as long as the bath temperature does not reach the set temperature, the sterilizing water is returned to the bath. Alternatively, the sterilizing water is returned to the bathtub unless the bathtub is full.

  That is, steps S30 to S35 in FIG. 4 are different from the first embodiment in FIG. The rest is the same. That is, when the supplied hot water reaches 65 ° C. (S19), the valve is first switched to the heat sterilization path (S30). That is, the valve M is set to the 1-2 position and the valve Y is set to the 1-2 position so that the sterilizing hot water that has passed through the filtration tank 22 is returned to the bathtub 10. Therefore, the heat sterilization timer Tn is started (S31). Then, in steps S32 and S33, the sterilizing hot water that has passed through the filter tank 22 is returned to the bathtub unless the bathtub temperature exceeds the set temperature or the bathtub is full. When the bathtub temperature exceeds the set temperature or when the bathtub reaches full water, the valve y is switched to the position 1-3, and the sterilizing water that has passed through the filter tank 22 is led to the drainage channel 31 and drained. (S34).

  The determination in steps S32 and S33 is, for example, by detecting how many liters of hot water for sterilization are returned to the bathtub or exceeding the preset temperature or full by calculating the amount of heat in step S13 or S17. This can be realized by switching to the drainage channel when the amount is detected by the water amount sensor 25. Alternatively, it can be managed by time. Furthermore, a water level sensor can be provided to monitor whether or not the bathtub is full.

  In the above embodiment, as long as there is no problem in the temperature and water level of the bathtub, the sterilizing hot water that has passed through the filtration tank can be returned to the bathtub, so that finer energy saving and water saving can be realized.

[Third embodiment]
The third embodiment is a modification of the first embodiment. In the first embodiment, when the bathtub temperature Tx when the sterilizing water is returned to the bathtub exceeds the vicinity of the set temperature, the sterilizing water is drained, but in the third embodiment, in that case After cooling the sterilizing water, return it all to the bathtub. As a cooling method, there are a method of providing a heat radiating path in parallel with the circulation path 20 to be described later, dissipating the sterilizing hot water and returning it to the bathtub, and a method of mixing the cold water in the circulation path 20 and returning it to the bathtub. Conceivable.

  FIG. 5 is a flowchart of the third embodiment. The difference from FIG. 2 is that step S40 is added. That is, in the heat sterilization process, before switching to the heat sterilization path, if it is found that the bathtub temperature Tx obtained by calculation exceeds the vicinity of the set temperature, it is provided in parallel between the filtration tank 22 of the circulation path 20 and the bathtub 10. Switch the valve to the heat radiating path, cool the sterilizing water, and return it to the bathtub. Or the valve of the water supply path connected to the output side of the filtration tank 22 of the circulation path 20 is opened, cold water is mixed, and it returns to a bathtub.

  Therefore, it is avoided that the sterilizing water is drained because the bath temperature exceeds the vicinity of the set temperature.

[Fourth Embodiment]
FIG. 6 is a diagram illustrating a configuration of a bathtub water filtration device according to a fourth embodiment. In this example, compared with FIG. 1, the backwashing path, the heater, the water amount sensor, and the like are omitted. In addition, a heat radiation path 43 provided with heat radiation means 42 is provided in parallel with the circulation path 20 between the filtration tank 22 and the bathtub 10. The circulation path 20 is provided with a water level sensor 43 that detects the bathtub water level.

  FIG. 7 is a flowchart of the fourth embodiment. Step S50 is a normal filtration operation. The valve K is set to the 1-2 position, the valve M is set to the 1-2 position, and the valve Y is set to the 1-2 position. Hot water in the bathtub 10 is circulated in the circulation path 20 by the pump 21. Then, dust in the bathtub water, dead bodies of germs, and the like are filtered by the filter tank 22.

  When the heat sterilization signal is issued (S51), the hot water supply path 41 from the hot water heat source unit 40 is connected to the circulation path 20, and the valve K is set to the position 3-2. Further, the valve Y is set to the position 1-3 and set to the drainage channel 31 side. In addition, the valve V is opened. And it waits until the hot water temperature from the hot water heat source machine 40 becomes temperature required for heat sterilization, for example, 65 degreeC (S53). At this time, a backwash path as shown in FIG. 1 may be provided to backwash the filtration tank.

  Eventually, when the hot water temperature reaches 65 ° C. (S53), the valve Y is set at the position 1-2 and the valve M is set at the position 3-2. Is returned to the bathtub via S (S54). Then, the thermal sterilization timer Tn starts (S55). Then, heat sterilization is started.

  The sterilizing hot water supplied from the hot water heat source unit 40 passes through the filtration tank 22, is cooled by the heat radiating means 41, and is returned to the bathtub 10. At that time, the water level of the bathtub is monitored by the water level sensor 43. While the water level in the bathtub does not reach full water, the sterilizing water is cooled and returned to the bathtub. When full water is reached (S56), it is switched to a drainage channel and thermal sterilization is continued while draining (S57). When the heat sterilization for 10 minutes is completed (S58), the valve is switched to the circulation path and the valve V is closed (S59).

  In the fourth embodiment, the temperature of the bathtub is largely prevented from exceeding the set temperature by providing the heat dissipation path and cooling the sterilizing hot water that has passed through the filter tank 22. Therefore, there is no need to obtain the bathtub water amount by the calorific value calculation or the bath temperature Tx when the sterilizing hot water is returned in the heat retaining step.

[Fifth Embodiment]
FIG. 8 is a diagram illustrating a configuration of a bathtub water filtration device according to a fifth embodiment. In this example, a water supply path 44 capable of mixing cold water is connected between the input / output 2 of the filtration tank 22 of the circulation path 20 and the bathtub 10 as cooling means for sterilizing hot water. And the valve | bulb M is provided in front of the bathtub 10, and the thermistor 47 which detects mixing temperature is provided. The water supply path 44 is provided with a valve W, a water amount adjustment valve 45 and a check valve 46.

  FIG. 9 is a flowchart of the fifth embodiment. This flowchart is different from the flowchart of FIG. 7 in that step S60 is provided instead of step S54 of FIG.

  If it demonstrates according to the flowchart of FIG. 9, if a normal filtration driving | operation is performed by step S50 and a heat sterilization signal is output (S51), the valve K will be set to the position of 3-1, and the hot water supply path from the hot water heat source machine 40 will be described. 41 is connected to the circulation path 20, the valve Y is set to the position 1-3, and the valve V is opened. At that time, the valves M and W remain closed. And it waits until the hot water from the hot water heat source machine 40 becomes 65 degreeC. In the meantime, the filtration tank 22 may be back-washed as described above.

  Eventually, when it reaches 65 ° C., heat sterilization is started. The heat sterilization timer Tn is started (S55). As long as the water level of the bathtub detected by the water level sensor 43 does not become full (S56), the hot water from the hot water heat source unit 40 passes through the filtration tank 22 and passes through the valve M from the valve Y 1-2. Return to 10. Furthermore, the valve W is also opened and cold water is mixed. Furthermore, the opening degree of the water amount adjustment valve 45 is adjusted so that the water amount necessary for lowering the 65 ° C. sterilizing hot water to near the set temperature. Therefore, it is possible to avoid the temperature of the bathtub 10 from greatly exceeding the vicinity of the set temperature. When the water level sensor 43 detects that the bathtub is full, the filter tank is switched to the drainage channel and the filter tank is sterilized while being drained (S57).

  Eventually, when 10 minutes of the heat sterilization time has elapsed (S58), the valve V is closed, the valve K is set to the 1-2 position, the valve Y is set to the 1-2 position, the valve M is opened, It is switched to the circulation path of the filtration operation.

  In the above embodiment, by mixing cold water with sterilizing hot water, the temperature of the hot water returned to the bathtub does not greatly exceed the set temperature, and the temperature of the bathtub is prevented from becoming higher than the set temperature. In this example, the remaining water amount calculation or the like is not performed in the heat retaining step, as in the fourth embodiment.

It is a lineblock diagram of a bathtub water filtration device which is an example of an embodiment of the present invention. It is a flowchart figure of a 1st embodiment. It is a graph which shows the change of the temperature of the bathtub when the hot water for sterilization is returned to the bathtub. It is a flowchart figure of the 2nd example of an embodiment. It is a flowchart figure of the example of 3rd Embodiment. It is a figure which shows the structure of the bathtub water filtration apparatus of the example of 4th Embodiment. It is a flowchart figure of the example of a 4th embodiment. It is a figure which shows the structure of the bathtub water filtration apparatus of the example of 5th Embodiment. It is a flowchart figure of a 5th example of an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bath 20 Circulation path 22 Filtration tank 30 Back washing path 31 Drainage path 40 Hot water supply means, hot water heat source machine 41 Hot water supply path 42 Heat radiation means 43 Heat radiation path 44 Water supply path

Claims (4)

A circulation path having both ends connected to the bathtub and circulating water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path, from the hot water generating means In the bathtub water filtration apparatus for performing the heat sterilization of the filtration means by exposing the filtration means to high-temperature hot water having a temperature necessary for the supplied heat sterilization,
When the hot water supplied from the hot water generating means passes the filtering means for a time required for sterilization, and when the hot water passed through the hot water is poured into the bathtub, the hot water in the bathtub does not overflow and passes. When the bath temperature when hot water is poured into the bathtub does not exceed the set temperature or the vicinity thereof, the passed hot water is poured into the bath , and when it overflows or exceeds, the passed hot water is discharged. A bathtub water filtration device characterized by: In claim 1, based on the amount and temperature of water in the bathtub, whether the hot water in the bathtub overflows when the hot water passed through is poured into the bathtub, and whether the bathtub temperature exceeds a set temperature or the vicinity thereof A bathtub water filtration device characterized by checking whether or not in advance. A circulation path having both ends connected to the bathtub and circulating water in the bathtub, a filtering means provided in the circulation path, and a hot water generating means for supplying hot water to the circulation path, from the hot water generating means In the bathtub water filtration apparatus for performing the heat sterilization of the filtration means by exposing the filtration means to high-temperature hot water having a temperature necessary for the supplied heat sterilization,
Pass the filtering means through the hot water supplied from the hot water generating means for a time required for sterilization, and pass the hot water in the range where the hot water in the bathtub does not overflow and the bathtub temperature does not exceed the set temperature or the vicinity thereof. A hot water bath is poured into the bathtub, and the hot water that has passed through is discharged after the non-overflow range and the non-overflow range are poured into the bath. 4. The amount of water in the range in which the hot water in the bathtub does not overflow when the high temperature hot water passed through the bathtub is poured into the bathtub based on the amount and temperature of water in the bathtub, and the bathtub temperature exceeds a set temperature or the vicinity thereof. A bathtub water filtration device characterized in that the amount of water in a non-existing range is obtained in advance.

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