JP3897259B2 - Pipe line purification device in bath water circulation device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pipe purification apparatus in a bath water circulation apparatus that cleans a circulation pipe with hot water and discharges the purified water safely by reducing the temperature of the hot water without causing burns to the human body. In this specification, hot water refers to a hot water temperature of 70 degrees Celsius or higher.
[0002]
[Prior art]
In the conventional bath water circulating apparatus, since a microbial film may adhere to the apparatus main body and the pipe when used for a long period of time, it is necessary to sterilize and clean the apparatus every certain period in addition to the safety and health problem. Moreover, the method puts a disinfectant directly in the hot water in a bathtub, and circulates an apparatus.
[0003]
For this reason, (1) a large amount of detergent must be used to put the bactericide into the bathtub water, which is uneconomical. (2) Since there is a possibility that an operator may come into contact with sewage, a high-concentration disinfectant cannot be used, and the cleaning effect is limited. (3) At the time of washing, since sewage circulates in the bathtub, it takes time to rinse after washing. There were also hygiene problems. For this reason, it is particularly desired to solve these problems. In this regard, the applicant has developed an apparatus for hot water cleaning only the inside of the circulation pipe with hot water. However, when the hot water is discharged, there is a problem that it is easily accompanied by a risk of burns.
[0004]
[Means for Solving the Problems]
Therefore, the inventor aimed to solve the above-mentioned problems, and as a result of earnest and research, the inventor becomes a heater capable of heating the bath water sucked from the bathtub from a low temperature to a high temperature, and fine dust and dirt. A filter for filtering impurities from the bath water, and a circulation pump for circulating the bath water, wherein the circulation pump circulates the bath water so as to return from the bathtub to the bathtub; It consists of a connecting pipe that connects an appropriate part near the suction side and an appropriate part near the outflow side of the circulation pipe, and a drain pipe that has one end connected to the circulation pipe. Detected by the pipe temperature detecting means provided in the pipe, the bath water is circulated through the connecting pipe while being heated by the heater, and the circulating pipe is washed with hot water with hot water, Mixing hot water and bath water in the circulation line to lower the temperature, By using a pipe purification device, etc. in a bath water circulation device characterized by draining the water, the circulation pipeline can be washed with hot water with hot water. It can be safely discharged so as not to cause burns, etc., and solves the above-mentioned problems.
[0005]
[Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a bath water circulation apparatus mainly includes a heater 1 such as a sheathed heater for heating bath water from a low temperature to a high temperature, and fine dust. And a filter 2 that filters out impurities that are contaminated from the bath water, a sterilizer 3 that sterilizes the bath water, a circulation pump P for circulating the bath water, and the bath water from the bathtub 10 to the bathtub 10 by the circulation pump P. And the circulation line 5 that circulates so as to return to the center.
[0006]
The filter 2 is, as a type, a precision filter or a normal filter, and is used as an adsorbent filter material filter material filled with activated stone or activated carbon, or is made of a woven or non-woven fabric and made of a filter material. There is also. In any case, dust and dirt that are fine due to impurities are removed.
[0007]
The connecting line 6 connects the appropriate part near the suction side of the circulation line 5 and the appropriate part near the outflow side of the circulation line 5, so that the outflow side line 5 b of the circulation line 5 is connected. A closed loop is constituted by the circulation line 5 and the connection line 6 in which the circulation pump P, the heater 1, the filter 2, and the sterilizer 3 are arranged. In the circulation pipe 5, the suction side is referred to as a water supply side pipe 5 a and the outflow side is referred to as an outflow side pipe 5 b, respectively, with respect to the connecting portions with both ends of the connection pipe 6. The circulation pump P, the heater 1, the filter 2, and the sterilizer 3 are not provided on the water supply side pipe line 5a and the outflow side pipe line 5b. In addition, a sub-connecting line 7 is provided between an appropriate place of the circulating line 5 between the circulation pump P and the heater 1 and an appropriate place of the circulating line 5 between the sterilizer 3 and the connecting line 6. Is provided. A pre-filter 11 is provided at the suction port of the water supply side pipe line 5a, and a jet part 12 is provided at the outlet of the outflow side pipe line 5b so that a jet jet flows. Further, it is preferable that the connecting pipe 6 is provided as close to the prefilter 11 and the ejection portion 12 as possible.
[0008]
There are embodiments in which appropriate valves are provided. In the first embodiment, a first on-off valve V1, a second three-way valve V2, a drainage three-way valve V3, and a mixing three-way valve V4 are used. Specifically, the first on-off valve V1 is disposed in the middle of the water supply side pipe 5a, and the second three-way valve V2 is disposed at the joint between the connection pipe 6 and the outflow side of the circulation pipe 5 for drainage. The three-way valve V <b> 3 is provided in the middle of the outflow side pipe 5 b of the circulation pipe 5. One end of the drain pipe 8 is connected to the drain side of the three-way valve V3 for drainage, and the other end of the drain pipe 8 is configured to flow out of the bathtub 10. The mixing three-way valve V <b> 4 is provided at a coupling point between the sub-connecting pipe 7 and the circulation pipe 5 between the circulation pump P and the heater 1.
[0009]
When purifying the pipe line, the first on-off valve V1 is closed and the water supply side pipe line 5a is shut off, and the second three-way valve V2 is closed on the outflow side pipe line 5b, and the connection pipe line 6 and the circulation pipe line 5 Is in a communicating state and the flowing direction of the mixing three-way valve V4 is switched only to the pipeline circulation side. At this time, since bath water does not circulate through the three-way valve V3 for drainage, it may be switched in any direction. As a result, in the circulation line 5, the circulation line 5 in which the circulation pump P, the heater 1, the filter 2, and the sterilizer 3 are disposed in a state where the water supply side line 5 a and the outflow side line 5 b are closed. And the connecting pipe 6 constitute a closed loop, and the internal bath water is circulated by the operation of the circulation pump P.
[0010]
In the above configuration, when hot water pipe cleaning is performed manually, as shown in FIG. 1, a cleaning switch 15 for instructing the start of cleaning to perform hot water pipe cleaning, and a response to the cleaning switch 15. A cleaning measuring means 16 (simple timer or the like) for measuring the cleaning time and a pipe temperature detecting means 17 for detecting whether the temperature in the circulation pipe 5 is 70 degrees Celsius or less are provided.
[0011]
FIG. 3 is a hot water conduit cleaning flowchart according to the manual operation of the present invention, in which the bather periodically cleans the hot water conduit. First, it is determined whether or not pipe cleaning with hot water is to be started (see S11), and when starting, a cleaning switch 15 provided in the main body is input. Then, the cleaning mode is entered (see S12), the sterilization lamp of the sterilizer is turned off (see S13), the first on-off valve V1 is closed, and the flowing water directions of the second three-way valve V2 and the mixing three-way valve V4 are piped. Switch to the in-road circulation side only (see S14 to S16). At this time, the heater 1 is kept ON (see S17). And it is detected whether the temperature in the circulation line 5 is 70 degrees C or less via the pipe temperature detection means 17 (refer S18), and in the case of 70 degrees C or less, the heater 1 returns to an ON state. . When the temperature is 70 degrees Celsius or higher, the heater 1 is turned off (see S19). In this state, the bath water in the closed loop pipe is circulated by the pump pressure of the circulation pump P, and the pipe line cleaning operation is started (see S20). This state is as shown in FIG. In S21 and 22, the pipe cleaning time is set in advance, and the time is measured by the cleaning measuring means 16 such as a simple timer. It is determined whether or not a predetermined time for pipe cleaning has elapsed (see S23), and if it has elapsed, it is determined whether or not the pipe cleaning work has been completed (see S24).
[0012]
When it is determined that the cleaning is completed, the first on-off valve V1 is opened to put the bath water in the bathtub 10 into the circulation line 5 (see S25), and the second three-way valve V2 is in the direction of the circulation line 5 And the direction of the connecting pipeline 6 are switched to each other, that is, the pipeline is circulated and switched to the normal circulation side (see S26). Furthermore, the mixing three-way valve V4 is switched so that the hot water and the bath water from the circulation pump P flow into the sub-connect pipe 7 through the circulation in the pipe line, that is, the bath water and the hot water in the bathtub 10 are switched. , Switch to the mixing side for further mixing (see S27). Then, the flowing water direction of the three-way valve V3 for drainage is switched to the drainage side (see S28). In this way, hot water and bath water are mixed, and a high temperature water of a certain amount of hot water and bath water is fed back from the second three-way valve V2 and flows again to the circulation pump P side. In some cases, the mixed water of the dirty hot water and the bath water that has been subjected to pipe cleaning at 50 degrees Celsius or outside flows out from the drain pipe 8. This state is as shown in FIG. Then, it is determined whether or not the drainage is completed (S29), and if the drainage is confirmed, the flowing direction of the drainage three-way valve V3 is switched only to the normal circulation side (see S30). Then, the flow direction of each of the second three-way valve V2 and the mixing three-way valve V4 is switched to the normal circulation side (see S31 and S32), the heater 1 is turned on (see S33), and the sterilization lamp of the sterilizer is turned on ( (See S34). Then, it returns to (2) of the flowchart (refer FIG. 6) of a driving | operation of a normal bath water circulation apparatus. This state is as shown in FIG.
[0013]
Further, when the inside of the circulation pipeline is automatically operated, it is controlled by a block diagram as shown in FIG. That is, a central processing unit 20 (CPU) is provided, and a cleaning command means 21 for controlling the start and time of pipe cleaning, a valve control means 22 for controlling various valves, and a heater control means 23 are provided. ing. The cleaning command means 21 includes a time setting unit 21a for setting a cleaning start time for cleaning the inside of the circulation pipe, a time storage unit 21b for storing the set cleaning start time and the cleaning time, and a cleaning start time. And a time changing unit 21c for appropriately changing the cleaning time.
[0014]
In the valve control means 22, when pipe cleaning is performed, the first on-off valve V1 is shut off, and the flowing directions of the second three-way valve V2 and the mixing three-way valve V4 are switched to the in-pipe circulation side. Further, when the pipe cleaning is completed, as the drainage control, the first on-off valve V1 is opened, the second three-way valve V2 is switched to the circulation inside the pipe and to the normal circulation side, and the mixing three-way valve V4 is mixed. The flow direction of the three-way valve V3 for drainage is controlled to be switched to the drainage side. Further, when drainage is completed, the first on-off valve V1 is left as it is, and the second three-way valve V2, the mixing three-way valve V4, and the drainage three-way valve V3 are controlled so as to switch to normal circulation respectively. ing.
[0015]
FIG. 8 is a flowchart for cleaning the pipe line by the automatic operation of the present invention. In S41, it is determined whether or not to set the cleaning time in the pipe line. Etc.) is set (see S42). Then, a determination is made as to whether or not to change the cleaning time (see S43). If the cleaning time is not changed, the set time or the like as it is is stored in the time storage unit 21b (see S44). Then, the cleaning time is measured by the cleaning command means 21 (see S45). It is determined whether or not the set time for starting the cleaning is reached (see S46), and when the set time for starting the cleaning is reached, the pipe cleaning mode is set (see S47). The sterilization lamp of the sterilizer is turned off (see S48), the first on-off valve V1 is closed, and the flowing directions of the second three-way valve V2 and the mixing three-way valve V4 are switched only to the in-pipe circulation side (S49). To S51). At this time, the heater 1 is kept on (see S52). Then, whether or not the temperature in the circulation line 5 is 70 degrees Celsius or less is automatically detected via the line temperature detecting means 17 (see S53). If the temperature is 70 degrees Celsius or less, the heater 1 is turned on. Keep state. Further, when the bath water in the pipeline exceeds 70 degrees Celsius, the heater 1 is turned off (see S54). In this state, the bath water in the closed loop pipe is circulated by the pump pressure of the circulation pump P, and the pipe line cleaning operation is started (see S55). This state is as shown in FIG. The cleaning time of the pipeline is controlled by the cleaning command means 21 and the cleaning time is set in advance, and it is determined whether or not the cleaning of the pipeline has been completed after a predetermined time for cleaning the pipeline has passed. (See S56).
[0016]
When it is determined that the cleaning is completed, the first on-off valve V1 is opened and the bath water in the bathtub 10 is put into the circulation line 5 (see S57), and the second three-way valve V2 is arranged in the direction of the circulation line 5. Switching is made so that the direction of the connecting pipeline 6 is in a communicating state, that is, switching to the normal circulation side in the pipeline (see S58). Furthermore, the mixing three-way valve V4 is switched so that the hot water and the bath water from the circulation pump P flow into the sub-connect pipe 7 through the circulation in the pipe line, that is, the bath water and the hot water in the bathtub 10 are switched. , Switch to the mixing side for further mixing (see S59). Then, the flowing water direction of the drainage three-way valve V3 is switched to the drainage side (see S60). In this way, hot water and bath water are mixed, and a high temperature water of a certain amount of hot water and bath water is fed back from the second three-way valve V2 and flows again to the circulation pump P side. In some cases, the low-temperature mixed water of dirty hot water and bath water that has been subjected to pipe cleaning automatically flows out from the drain pipe 8. This state is as shown in FIG. Then, it is determined whether or not the drainage is completed (see S61). When the drainage is confirmed by the flow rate measuring means, the flow direction of the drainage three-way valve V3 is switched to the normal internal circulation side (see S62). . The first on-off valve V1 is left as it is, and the flowing direction of the second three-way valve V2 and the mixing three-way valve V4 is switched to the normal circulation side (see S63 and S64), and the heater 1 is turned on (see S65). The sterilization lamp of the sterilizer is turned on (see S66). Then, it returns to (2) of the flowchart (refer FIG. 6) of the normal operation of the bath water circulation device. This state is as shown in FIG.
[0017]
In the flowchart of the normal operation state of the bath water circulation device, as shown in FIG. 6, it is determined whether or not the bath water circulation device is driven (see S1). Is turned on (see S2), the circulation pump P is driven (see S3), the heater 1 is turned on (see S4), and the sterilization lamp of the sterilizer is turned on (see S5). Drive. At that time, it is determined whether or not pipe cleaning is performed (see S6), and if it is to be cleaned, the flowchart of the manual or automatic subroutine of (1) is obtained. If it is determined not to be washed, it is driven as it is, and it is determined whether or not to stop the bath water circulation device (see S7). If it is stopped, it is terminated. If not, the bath water circulation device is turned on. Return to the front.
[0018]
The second embodiment shown in FIG. 4 and FIGS. 5A and 5B is a type that is omitted from the sub-connecting conduit 7 and the three-way valve for mixing V4 in the first embodiment. The configuration is the same as that of the first embodiment shown in FIG. In this second embodiment type, S15, S26, and S31 are deleted from the manual flowchart (see FIG. 3), and S51, S59, and S64 are deleted from the automatic flowchart (see FIG. 8). The flowcharts are the same.
[0019]
In the embodiment shown in FIGS. 9 to 13, water other than the bath water of the bathtub 10 is mixed with hot water and discharged. FIG. 9 shows that a low-temperature water tank 25 for storing low-temperature water is provided in the middle of the outflow side pipe line 5b between the second three-way valve V2 and the drainage three-way valve V3. It is the same as FIG. At the time of drainage, hot water is mixed in the low-temperature water tank 25 and can be drained at a low temperature, thereby avoiding dangers such as burns to the human body. This flowchart is the same as the embodiment of FIG. FIG. 10 shows a case where a low-temperature water tank 25 in which low-temperature water is stored is provided in the middle of the drain pipe 8, and the other configuration is the same as FIG. At the time of drainage, hot water is mixed in the low-temperature water tank 25 and can be drained at a low temperature, thereby avoiding dangers such as burns to the human body. This flowchart is the same as the embodiment of FIG.
[0020]
In FIG. 11, a fifth three-way valve V5 is provided in the middle of the outflow side pipe line 5b between the second three-way valve V2 and the drainage three-way valve V3, and a pipe 26 is connected to the fifth three-way valve V5. Water is allowed to flow in from the water heater 27, and other configurations are the same as those in FIG. It becomes the structure into which the water from the water heater 27 flows in at the time of drainage. Thus, when draining, hot water can be mixed at the fifth three-way valve V5 and the temperature can be lowered and drained. FIG. 12 shows a water supply system 28 in place of the water heater 27 in the embodiment of FIG. 11, and allows tap water to flow from the water supply system 28 to the fifth three-way valve V5 via the pipe 26. The other configuration is the same as FIG. It becomes the structure into which the water from the water heater 27 flows in at the time of drainage.
[0021]
FIG. 13 shows that the sixth three-way valve V6 is provided in the circulation line 5 between the second three-way valve V2 and the sterilizer 3, and the low-temperature water tank 25 is provided at the end of the pipe 29 from the sixth three-way valve V6. In addition, a pipe 30 is provided between the low-temperature water tank 25 and the circulation pipe 5 again, and a seventh on-off valve V7 is provided in the middle of the pipe 30. Some cold water is added. Other configurations are the same as those in FIG. At the time of drainage, hot water is mixed in the low temperature water tank 25 and can be drained when the temperature is lowered, thereby avoiding dangers such as burns to the human body. This flowchart is the same as the embodiment of FIG.
[0022]
In the configuration of FIG. 4, the second three-way valve V2 and the connecting pipe 6 are removed, and instead, provided in the bathtub connecting pipe 13 (see the chain line in FIG. 4), both ends of the bathtub connecting pipe 13 are connected to each other. The pre-filter 11 and the ejection part 12 may be connected to each other. This is the configuration during pipe cleaning. During drainage, the direction of the drainage three-way valve V3 is set to the direction rotated 180 degrees in FIG. 4, and the other flowcharts are the same as those in FIG. 3 except S15, S26, and S31.
[0023]
【The invention's effect】
First, in the invention of claim 1, in particular, after the circulation pipe is washed with hot water with hot water, the hot water and the bath water are mixed in the circulation pipe to lower the temperature, and then passed through the drain pipe. By draining, safety can be secured for bathers by lowering the temperature when draining after hot water washing. In the invention of claim 2, the heater 1 that can heat the bath water from a low temperature to a high temperature, a filter 2 that filters fine dust and dirt impurities from the bath water, and a circulation pump P for circulating the bath water A circulation line 5 through which the bath water circulates back from the bathtub 10 to the bathtub 10 by the circulation pump P, an appropriate portion near the suction side of the circulation line 5, and an outflow side of the circulation line 5 It consists of a connecting pipe 6 that connects an appropriate portion close to the drain pipe 8, and a drain pipe 8 that is connected to the circulation pipe 5 at one end. When washing the pipe, It is possible to circulate through the connecting pipe 6 while maintaining a high temperature, and at the time of draining, the bath water in the bathtub 10 and the hot bath water in the circulation pipe 5 are mixed in the circulation pipe 5 to mix the bath 10. In the bath water circulation device, which can be discharged to the outside through the drain pipe 8. First, the waste water is mixed with the bath water in the bathtub 10 and the bath water purified in the circulation pipe, and the temperature is considerably lowered. The risk of burns can be avoided. In particular, since it is performed by hot water sterilization, not only Legionella bacteria but also Cryptosporidium bacteria can be killed, and it is extremely safe and hygienic. It is possible to easily and easily clean the pipeline, and thirdly, the worker can safely perform the cleaning work because there is no possibility of contact with the disinfectant and its drainage. The sewage that has been turned into hot water after switching by switching the circulation path is not directly drained into the bathtub, but is discharged to the drain through the drain pipe 8, so that there is no need to rinse the bathtub 10.
[0024]
In invention of Claim 3, the heater 1 which can heat bath water from low temperature to high temperature, the filter 2 which filters the impurities which become fine dust and dirt from bath water, The circulation pump P for circulating bath water, Circulation pipe 5 in which the bath water circulates back from bathtub 10 to bathtub 10 by circulation pump P, an appropriate location near the suction side of circulation pipe 5 and the outflow side of circulation pipe 5 A connecting pipe 6 for connecting an appropriate location, a first on-off valve V1 provided closer to the suction side than the connecting location of the connecting pipeline 6 in the circulation pipeline 5, and the connecting pipeline 6 and the circulation pipeline 5 The second three-way valve V2 provided at the connection location near the outflow side of the water and the drainage three-way valve V3 provided closer to the discharge side than the connection location of the connection pipeline 6 in the circulation pipeline 5 Occasionally, the bath water in the circulation line 5 is heated to a high temperature by the heater 1 by switching the valves. It is possible to circulate through the connecting pipe 6, and even when draining, the bath water in the bathtub 10 and the hot bath water in the circulation pipe 5 are mixed in the circulation pipe 5 by switching the valves. By adopting the pipe purification device in the bath water circulation device that can be discharged to the outside of the bathtub 10, the pipeline can be cleaned with hot water relatively easily by operating each valve, and the temperature can be lowered during drainage. Therefore, safety can be ensured for the bather, and the same effect as the invention of claim 2 can be obtained.
[0025]
According to a fourth aspect of the present invention, in the first, second, or third aspect, the cleaning switch 15 that commands the start of cleaning to further clean the pipeline, and the cleaning measuring means 16 that measures the cleaning time in response to the cleaning switch 15. With the pipe purification device in the bath water circulation apparatus comprising the above, the operation of each valve and equipment is manual, but when cleaning is started, the desired time (time that can be cleaned) is set as the cleaning time. The road can be washed.
[0026]
According to a fifth aspect of the present invention, in the second or third aspect, the cleaning command means 21 for starting and controlling the cleaning time at the time of pipe cleaning, and the valve control means 22 for controlling the pipe cleaning, drainage, etc. The cleaning command means 21 includes a time setting unit for setting the cleaning start time, and a time storage unit for storing the set cleaning start time and the cleaning time. By setting the start time, the cleaning time, etc. to be cleaned, it is possible to automatically clean the pipeline, and the valve control at this time allows the inside of the circulation pipeline to be cleaned. It is also possible to suitably drain water. In addition, the other effects can be obtained by the same effects as the invention of claim 2.
[Brief description of the drawings]
FIG. 1 is a schematic view of a first embodiment of the present invention. FIG. 2A is a schematic view of the first embodiment during drainage. FIG. 1B is a normal view of the first embodiment. Schematic diagram during operation [FIG. 3] Flow chart of pipe cleaning by manual operation [FIG. 4] Schematic diagram of the second embodiment of the present invention [FIG. 5] (A) is a diagram of the second embodiment. Schematic diagram during drainage (B) is a schematic diagram during normal operation of the second embodiment. FIG. 6 is a flowchart of normal operation of the bath water circulation device. FIG. 7 is a block diagram of pipe cleaning by automatic operation. FIG. 8 is a flowchart of protective tube cleaning by automatic operation. FIG. 9 is a schematic diagram of another embodiment of the present invention. FIG. 10 is a schematic diagram of another embodiment of the present invention. FIG. 12 is a schematic diagram of another embodiment of the present invention. FIG. 13 is a schematic diagram of still another embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Heater 2 ... Filter 5 ... Circulation pipe line 5a ... Water supply side pipe line 5b ... Outflow side pipe line 6 ... Connection pipe line 10 ... Bath 15 ... Cleaning switch 16 ... Cleaning measuring means 21 ... Cleaning command means 22 ... Valve control means P ... Circulation pump V1 ... First on-off valve V2 ... Second three-way valve V3 ... Three-way valve for drainage

Claims (5)

A heater capable of heating the bath water sucked from the bath from a low temperature to a high temperature, a filter for filtering fine dust and dirty impurities from the bath water, and a circulation pump for circulating the bath water; A circulation pipe that circulates so that the bath water returns from the bathtub to the bathtub, and a connecting pipe that connects an appropriate location near the suction side of the circulation pipeline and an appropriate location near the outflow side of the circulation pipeline And a drain pipe having one end connected to the circulation pipe,
At the time of washing the pipeline, it is detected by the pipeline temperature detecting means provided in the circulation pipeline, and the bath water is circulated through the connecting pipeline while being heated by the heater, and the circulation pipeline is heated with hot water. A pipe purification device in a bath water circulation apparatus , wherein after washing with water , the hot water and bath water are mixed in the circulation pipe to lower the temperature and drain through the drain pipe. A heater capable of heating the bath water from a low temperature to a high temperature, a filter for filtering fine dust and dirt impurities from the bath water, a circulation pump for circulating the bath water, and the bath water from the bathtub by the circulation pump A circulation line that circulates back to the bathtub, a connection line that connects an appropriate point near the suction side of the circulation line and an appropriate point near the outflow side of the circulation line, and the circulation line And a drain pipe with one end connected to
At the time of pipe cleaning, the bath water in the circulation pipe can be circulated through the connecting pipe while being heated by a heater, and at the time of drainage, the bath water in the bathtub and the hot bath water in the circulation pipe can be circulated. A pipe purification apparatus in a bath water circulation apparatus, wherein the pipe is mixed in the circulation pipe and can be discharged to the outside of the bathtub through the drain pipe. A heater capable of heating the bath water from a low temperature to a high temperature, a filter for filtering fine dust and dirt impurities from the bath water, a circulation pump for circulating the bath water, and the bath water from the bathtub by the circulation pump A circulation conduit that circulates back to the bathtub, a connection conduit that connects an appropriate location near the suction side of the circulation conduit and an appropriate location near the outflow side of the circulation conduit, and the circulation conduit A first on-off valve provided closer to the suction side than the connection line connection point, a second three-way valve provided at a connection point between the connection line and the outflow side of the circulation line, and the circulation line It consists of a three-way valve for drainage provided closer to the discharge side than the connecting pipe connection point,
At the time of pipe washing, the bath water in the circulation pipe can be circulated through the connection pipe while the temperature of the circulation pipe is increased by a heater by switching each valve. And a high-temperature bath water in the circulation pipe can be mixed in the circulation pipe and discharged to the outside of the bathtub.   4. The cleaning switch according to claim 1, further comprising a cleaning switch for instructing the start of cleaning for cleaning the pipeline, and cleaning measuring means for measuring a cleaning time in response to the cleaning switch. A pipe purification device in a bath water circulation device.   4. The cleaning command means according to claim 1, further comprising a cleaning command means for starting and controlling a cleaning time at the time of pipe cleaning, and a valve control means for controlling the pipe cleaning and drainage. Comprises a time setting unit for setting a cleaning start time, and a time storage unit for storing the set cleaning start time and the cleaning time.

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