JP5050000B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage hot water supply system including a hot water storage tank for storing hot water.

  In the hot water storage type hot water supply system, heated hot water is stored in a hot water storage tank, and hot water stored in the hot water storage tank is supplied as needed. Such a hot water supply system is employed in, for example, a cogeneration system that uses generated heat generated by power generation as a heat source for hot water supply. In the hot water storage hot water supply system, city water is supplied from a city water supply port to a hot water storage tank, and hot water obtained by heating the city water to a heat source is stored in the hot water storage tank.

  When a disaster such as a fire or earthquake occurs, or when water pipe construction is performed, the city water supply is stopped. Patent Documents 1 and 2 disclose a hot water storage type hot water supply system that employs a technique for water cutoff.

JP 2007-255753 A JP 2007-120732 A

  Patent Documents 1 and 2 do not describe how city water is supplied to the hot water tank after returning from water outage. It is expected that city water will be supplied to the hot water tank immediately after returning from the water outage. Usually, the city water supplied immediately after the return of water supply is muddy water mixed with rust of piping and sludge mixed during construction. Once muddy water flows into the hot water tank, even if clean city water is supplied to the hot water tank, rust, sludge, etc. in the muddy water will accumulate in the lower part of the hot water tank, and there is a high possibility that they will not flow out. Therefore, it is necessary to drain all water from the hot water tank and clean the inside.

  In this specification, the technique which prevents that muddy water flows into a hot water storage tank at the time of a water return reset is provided.

  The hot water storage hot water system disclosed in this specification includes a hot water storage tank, a water supply path that communicates with a city water supply port and supplies water to the hot water storage tank, a hot water supply path that supplies hot water from the hot water storage tank, a supply port, and a hot water storage tank. A first opening / closing means for opening and closing the water supply path, a water cutoff detection means for detecting water cutoff, and a first opening / closing means for closing the water supply path when the water cutoff detection means detects water cutoff. Opening / closing control means for controlling and drainage means for draining a predetermined amount of city water supplied from the supply port in a state where the water supply path is closed. In addition, the above-mentioned “when the water-stop detection unit detects water-stop” may be “when the start of water-stop is detected” or “when it is detected that the water has stopped”. However, it may be “when the end of water shutoff is detected”.

  The hot water storage type hot water supply system described above can shut off the supply of city water to the hot water storage tank by controlling the first opening / closing means so as to close the water supply path when water outage is detected. In a state where city water is not supplied to the hot water storage tank, it is possible to drain a predetermined amount of city water that is likely to be muddy water. Thereby, it is possible to prevent turbid water from flowing into the hot water storage tank when the water supply is restored.

  Said hot water storage type hot-water supply system may further comprise a notifying means for notifying that the drain means is being drained. According to this hot water storage type hot water supply system, the user can know that it is draining.

  The hot water storage type hot water supply system may further include an operation unit that is operated by a user. The drainage unit may stop draining before draining the predetermined amount of city water when the first operation is performed in the operation unit during draining of the predetermined amount of city water. According to this hot water storage type hot water supply system, the user can stop the drainage by executing the first operation when determining that the city water being drained is not muddy water.

  The hot water storage type hot water supply system may further include an operation unit that is operated by a user. The drainage means may further drain the city water supplied from the supply port after the predetermined amount of city water is drained when the second operation is executed by the operation means. According to this hot water storage type hot-water supply system, when the user confirms that muddy water is drained even when the drainage is completed, the user can drain a predetermined amount or more of city water.

  The hot water storage hot water supply system may further include a drainage path connected to the water supply path and a second opening / closing means for opening and closing the drainage path. The drainage means may drain the predetermined amount of city water by controlling the second opening / closing means to open the drainage path. According to this hot water storage type hot water supply system, the city water supplied from the supply port can be drained while the first opening / closing means is closed.

  Said hot water storage type hot-water supply system may increase the said predetermined amount, so that the period from the start to the end of water stop becomes long. There is a possibility that rust, sludge, etc. are mixed in many city waters that are supplied after the stoppage of the water stop as the water stop time is longer. Therefore, in the hot water storage type hot water supply system described above, the amount of drainage is increased as the water cutoff time becomes longer. Therefore, inflow of muddy water to the hot water tank can be prevented more reliably.

The schematic of the hot water storage type hot-water supply system of an Example is shown. The flowchart which a controller performs is shown. FIG. 3 is a flowchart continued from FIG. 2. FIG. FIG. 3 is a flowchart continued from FIG. 2. FIG.

A part of the technology disclosed in the embodiments described below will be described.
(Characteristic 1) The water stop detection means may detect the start of water stop. The opening / closing control means may control the first opening / closing means so as to close the water supply path when the start of water shutoff is detected.
(Characteristic 2) The above-described hot water storage type hot water supply system may further include heating means and a heating path for sending city water from the hot water storage tank to the heating means and returning the city water heated by the heating means to the hot water storage tank. Good.
(Characteristic 3) The opening / closing control means may resume the supply of city water to the hot water storage tank by controlling the first opening / closing means to open after draining the predetermined amount of city water.
(Characteristic 4) The above water supply path has one end connected to the supply port and the other end connected to the first opening / closing means, and one end connected to the first opening / closing means. And a second path having the other end connected to the hot water storage tank.
(Feature 5) In the feature 5, the hot water storage type hot water supply system may further include a third path having one end connected to the first opening / closing means and the other end connected to the hot water supply path. The first opening / closing means may change the ratio of the amount of city water supplied to the second path and the amount of city water supplied to the third path. The hot water storage hot water supply system may further include a hot water supply temperature setting unit that allows a user to set the temperature of hot water supplied from the hot water supply path. The open / close control means controls the above ratio to mix the hot water supplied from the hot water tank to the hot water supply route and the city water supplied to the third route, and use the hot water at the temperature set by the user. You may supply to a location. Further, the opening / closing control means controls the first opening / closing means so that the ratio of the city water amount supplied to the second route and the city water amount supplied to the third route becomes 0: 1, thereby providing the water supply route. May be closed. In this case, a 3rd path | route will be opened and the city water supplied from a supply port may be drained to a hot-water utilization location via a 3rd path | route and a hot-water supply path | route. That is, in this embodiment, the drainage path is constituted by a part of the third path and the hot water supply path. In this form, it can also be said that the third path for mixing city water with warm water also serves as a drainage path.
(Characteristic 6) In the characteristic 4, the drainage path may be connected to the hot water supply path on the supply port side from the first opening / closing means. In this case, the drainage path may drain into a tank disposed in the heating path.

  Embodiments will be described with reference to the drawings. FIG. 1 shows a schematic diagram of a hot water storage type hot water supply system 2 of the present embodiment. The hot water storage hot water supply system 2 includes a city water supply port 100, a heat load 400, a hot water storage unit 500, a remote controller 600, an exhaust heat recovery unit 700, and the like.

  The thermal load 400 includes a heating terminal 410, a bathtub 420, a hot water tap 430, and the like. Examples of the heating terminal 410 include an air-conditioning heater, floor heating, and road heating. The hot water tap 430 is installed in a kitchen, a washroom, a bathroom shower, a currant, and the like. In addition, hot water taps 430 are also installed at places where hot water is used such as a drain plug of a toilet (not shown) and an outdoor outlet.

  The exhaust heat recovery unit 700 includes a power generation unit (not shown), a fuel cell, a reformer, a heat recovery heat exchanger, and the like. The fuel cell generates power by reacting hydrogen gas generated in the reformer with oxygen in the air. Generated heat is generated with the power generation, and the heat medium in the heat medium circulation path in the exhaust heat recovery unit 700 is heated by the generated heat. The heat of the heat medium in the heat medium circulation path is input to the heat recovery heat exchanger. A path 702 extending from the lower part of the hot water tank 300 to the exhaust heat recovery unit 700 passes through the heat exchanger for heat recovery. Thereby, the water in the path 702 is heated. The heated water is returned to the hot water tank 300 through a path 704 extending from the exhaust heat recovery unit 700 to the upper part of the hot water tank 300.

  The hot water storage unit 500 includes a path 90 connected to the city water supply port 100. A pressure switch 10, a pressure reducing valve 12, a water supply thermistor 14, a water supply amount sensor 16, a water supply amount servo 18, and a mixing unit 200 are interposed in the path 90. The pressure switch 10 outputs an ON signal when the water pressure supplied from the supply port 100 is equal to or higher than the specified pressure, and outputs an OFF signal when the water pressure falls below the specified pressure. The pressure reducing valve 12 adjusts the water supply pressure, and opens when the pressure on the downstream side of the pressure reducing valve 12 decreases, and maintains the water pressure at a predetermined pressure regulation value. For this reason, when the hot water in the hot water storage tank 300 decreases or the mixing unit 200 is opened, city water is supplied by the action of the pressure reducing valve 12. The water supply thermistor 14 detects the temperature of the city water supplied. The water supply amount sensor 16 detects the flow rate of city water to be supplied. The water supply servo 18 adjusts the flow rate of city water to be supplied. One end of the path 92 and one end of the path 96 are connected to the mixing unit 200. The other end of the path 92 is connected to a path 94 described later. The other end of the path 96 is connected to the lower part of the hot water tank 300. The mixing unit 200 can change the ratio of the amount of city water supplied to the path 92 and the amount of city water supplied to the path 96.

  The hot water storage unit 500 further includes a path 94 having one end connected to the top of the hot water storage tank 300. The other end of the path 94 is connected to the hot water tap 430. In the path 94, a tank thermistor 56, a tank solenoid valve 30, and a hot water thermistor 32 are interposed. The tank thermistor 56 measures the temperature of the hot water supplied from the hot water tank 300. The tank solenoid valve 30 opens and closes the path 94. The hot water thermistor 32 measures the temperature of the hot water after the hot water supplied from the hot water tank 300 and the city water supplied from the path 92 are mixed.

  One end of the path 22 is connected to the path 94. The other end of the path 22 is connected to the path 24. A hot water filling valve 34 and a hot water filling amount sensor 36 are interposed in the path 22. The hot water filling valve 34 opens and closes the path 22. The hot water amount sensor 36 measures the amount of water in the path 22. Both one end and the other end of the path 24 are connected to the bathtub 420. A bath circulation pump 38 is interposed in the path 24. The bath circulation pump 38 is a pump for returning the water in the bathtub 420 back to the bathtub 420 via the path 24. The path 24 passes through the bath heat exchanger 40.

  The user can set the hot water supply temperature of the hot-water tap 430 or the bathtub 420 by using a remote controller 600 described later. Based on the measured values of the water supply thermistor 14 and the tank thermistor 56, the controller 800 sets the ratio of the opening degree on the path 92 side and the path 94 side in the mixing unit 200 so that hot water at the set hot water temperature is obtained. adjust. When the hot water tap 430 is opened by the user, hot water at the set hot water temperature is supplied to the hot water tap 430. Moreover, when the controller 800 opens the hot water filling valve 34, hot water having a set hot water supply temperature is supplied to the bathtub 420. Note that the controller 800 monitors that the amount of water set by the user is supplied to the bathtub 420 based on the measurement value of the hot water amount sensor 36. When the set amount of water is supplied to the bathtub 420, the controller closes the filling valve 34.

  The hot water storage unit 500 further includes a path 50, a path 52, and a path 20. One end of the path 50 is connected to the top of the hot water tank 300. The other end of the path 50 is connected to one end of the path 52 and one end of the path 20. A circulation inlet thermistor 76, a circulation pump 78, a circulating water amount sensor 80, a circulating water amount servo 82, a burner 84, and a circulation outlet thermistor 72 are interposed in the path 50. The circulation inlet thermistor 76 measures the temperature of the hot water supplied from the hot water tank 300. The circulating water amount sensor 80 measures the amount of water in the path 50. The circulating water amount servo 82 adjusts the amount of water in the path 50. The burner 84 heats the water in the path 50. The circulation outlet thermistor 72 measures the water temperature in the path 50 after passing through the burner 84. The other end of the path 20 is connected to the top of the hot water tank 300. An electromagnetic valve 98 is interposed in the path 20. The electromagnetic valve 98 opens and closes the path 20.

  For example, when the water temperature in the hot water tank 300 is low, the water in the hot water tank 300 can be raised using the path 50 and the path 20. The controller 800 opens the solenoid valve 98 and drives the circulation pump 78. Further, the controller 800 drives the burner 84. Thereby, the water sent out from the hot water tank 300 to the path 50 is heated by the burner 84 and returns to the hot water tank 300 through the path 20.

  The other end of the path 52 is connected to the path 20. The path 52 passes through the heating heat exchanger 64. A heating heat exchanger outlet thermistor 58 and a solenoid valve 86 are interposed in the path 52. The heating heat exchanger outlet thermistor 58 measures the water temperature in the path 52 after passing through the heating heat exchanger 64. The electromagnetic valve 86 opens and closes the path 52.

  Hot water storage unit 500 further includes a path 54 having one end connected to path 52. The other end of the path 54 is connected to the path 50. An electromagnetic valve 74 is interposed in the path 54. The electromagnetic valve 74 opens and closes the path 54.

  The hot water storage unit 500 further includes a path 55 that passes through the heating terminal 410. The path 55 passes through the heating heat exchanger 64. In the path 55, a cistern 60, a heating pump 62, and a heating thermistor 66 are interposed. The cistern 60 is a tank that stores water. A cistern drain valve 88 is disposed below the cistern 60. Further, one end of a path 27 in which a cistern water supply valve 70 is interposed is connected to the cistern 60. The other end of the path 27 is connected to the path 90 on the supply port 100 side from the mixing unit 200. The heating thermistor 66 measures the water temperature in the path 55 after passing through the heating heat exchanger 64.

  The hot water storage unit 500 further includes a path 57 whose both ends are connected to the path 55. The path 57 passes through the bath heat exchanger 40. A memorial heat valve 68 is interposed in the path 57. The memorial thermal valve 68 opens and closes the path 57.

  The controller 800 supplies heat to the heating terminal 410 as follows. The controller 800 opens the solenoid valve 86 with the solenoid valve 98 and the solenoid valve 74 closed, and drives the circulation pump 78. Thereby, the hot water in the hot water storage tank 300 passes through the heating heat exchanger 64 via the path 50 and the path 52. The hot water that has passed through the heating heat exchanger 64 returns to the hot water tank 300 through the path 52 and the path 20. The controller 800 further drives the heating pump 62. Thereby, the water circulates in the path 55. The water in the path 55 is heated by the heating heat exchanger 64. As a result, heat is supplied to the heating terminal 410. When the water temperature in the hot water storage tank 300 is low, the controller 800 opens the electromagnetic valve 74 with the electromagnetic valve 98 and the electromagnetic valve 86 closed, and drives the circulation pump 78. Since the solenoid valve 98 is closed, water is not sent from the hot water tank 300 to the path 50. However, since the electromagnetic valve 74 is opened, water circulates through the path 52, the path 54, and the path 50. The controller 800 drives the burner 84. Thereby, the hot water heated by the burner 84 passes through the heating heat exchanger 64.

  In addition, the controller 800 performs a bath retreat as follows. The point that the hot water is controlled to pass through the heating heat exchanger 64 is the same as described above. The controller 800 further opens the remnant thermal valve 68 and drives the heating pump 62. Thereby, water circulates through the path 57. The hot water heated by the heating heat exchanger 64 passes through the bath heat exchanger 40. The controller 800 further drives the bath circulation pump 38. Thereby, the water in the bathtub 420 circulates through the path 24. As a result, the water in the path 24 is heated by the bath heat exchanger 40.

  The hot water storage unit 500 further includes a controller 800. The controller 800 stores a control program and controls various pumps, servos, thermistors, valves, and the like. A remote controller 600 is connected to the controller 800. The remote controller 600 includes a water cutoff treatment release switch 610, a water cutoff treatment switch 620, a display 630, an automatic return mode switch 640, and the like. The remote controller 600 is disposed in a bathroom, a washroom, a kitchen, or the like. By operating the remote controller 600, the user can make a request for using the heating terminal 410, filling or refilling the bathtub 420, using the hot water tap 430, setting the hot water supply temperature, and the like. Various information is displayed on the display 630. For example, information related to the hot water supply temperature, the hot water temperature of the bathtub, the hot water time set by the user is displayed. Furthermore, information indicating that the water is being stopped, information indicating that the water is being drained after the water is shut off, information indicating the selection state of the automatic return mode after the water is shut off, information on the required drainage amount during the water shutoff process, and the like are displayed.

  Then, the water stop process which the controller 800 performs is demonstrated. 2 to 4 show flowcharts of the water cutoff process executed by the controller 800. FIG. The controller 800 receives an output signal from the pressure switch 10. Based on the output signal from the pressure switch 10, the controller 800 determines whether or not water shutoff has been started (S2). When it is not in a water shut-off state, the water pressure in the path 90 is equal to or higher than the specified pressure, and the pressure switch 10 outputs an ON signal. In this case, the controller 800 determines NO in S2. On the other hand, when the water is cut off, the water pressure in the path 90 is equal to or lower than the specified pressure, and the pressure switch 10 outputs an off signal. In this case, the controller 800 determines YES in S2.

  If YES in S2, the controller 800 fully opens the valve on the path 92 side of the mixing unit 200 and fully closes the valve on the path 96 side (S4). Thereby, the inflow of city water to the hot water tank 300 is blocked. The controller 800 starts a water cutoff integration timer (S6). Next, the controller 800 outputs information indicating that the water cutoff process is being performed to the remote controller 600 (S8). As a result, for example, the remote controller 600 causes the display 630 to display a character indicating that the water is currently being stopped and draining is performed after the water stop. Note that the remote controller 600 may output a sound such as a predetermined buzzer or voice instead of or together with the display. In addition, the remote controller 600 may display the time during which water has been stopped, the amount of drainage required after the water is stopped, and the like. The display in S8 is continued until it is cleared in S20 in FIG. Therefore, the display is continued even during drainage between S14 and S18 in FIG. For this reason, the user can know that the water cutoff treatment is being performed. In addition, you may display the character which shows in draining between S14-S18 of FIG.

  When S8 ends, the controller 800 waits until the normal state is restored from the water cutoff state (S10). When the water cutoff is completed, city water is supplied from the supply port 100 to the path 90, and the water pressure in the path 90 becomes equal to or higher than the specified pressure. In this case, the output signal from the pressure switch 10 is switched from the off signal to the on signal. When the output signal from the pressure switch 10 becomes an ON signal, the controller 800 determines YES in S10.

  By operating the automatic return mode switch 640 of the remote controller 600, the user can select whether or not to automatically drain water after the end of a water stop. This operation timing may be, for example, the timing when the water stop is notified in S8, may be before the start of the water stop, or may be the timing when the water stop is completed. If the automatic draining is selected, the controller 800 determines YES in S12 and proceeds to S14 in FIG. On the other hand, if it is not selected to automatically drain, the controller 800 determines NO in S12 and proceeds to S26 in FIG.

  In S14 of FIG. 3, the controller 800 opens the filling valve 34. As a result, the city water supplied from the supply port 100 is drained to the bathtub 420 via the route 90, the route 92, the route 94, the route 22, and the route 24. The controller 800 calculates the cumulative amount of water drained into the bathtub 420 based on the measurement value of the water supply amount sensor 16 (or sensor 36). When the accumulated water amount exceeds the predetermined amount, the controller 800 determines YES in S16 and closes the hot water filling valve 34 (S18). Thereby, drainage is completed.

  It should be noted that the controller 800 displays on the display 630 of the remote controller 600 the accumulated water amount drained into the bathtub 420, the predetermined amount serving as the determination criterion in S16, the remaining drainage amount, and the like while city water is being drained. You may let them. Furthermore, in the present embodiment, the predetermined amount serving as the determination criterion in S16 is determined according to the water shutoff time (the time during which the water shutoff has continued). The controller 800 increases the predetermined amount as the water cutoff time is longer. The timer started in S2 of FIG. 2 is stopped when YES is determined in S10. The timer value at this time is the water shut-off time. The controller 800 sets the predetermined amount to 50 liters when the water shut-off time is less than 6 hours, sets the predetermined amount to 100 liters when the water shut-off time is 6 to 12 hours, and sets the water shut-off time to 12 to 24 hours. The predetermined amount is 200 liters, and when the water shutoff time is 24 to 48 hours, the predetermined amount is 400 liters.

  The controller 800 instructs the remote controller 600 to end the display (S20). At this time, the remote controller 600 may notify the end of the water shutoff process by a sound such as a display and / or a buzzer or a sound. Subsequently, the controller 800 releases the fully closed state of the valve on the path 96 side of the mixing unit 200 (S12). As a result, the city water supply from the supply port 100 to the hot water tank 300 is resumed.

  In the present embodiment, when the bathtub 420 is in use, or when it is desired to effectively use the muddy water after returning from the water stoppage in the toilet drainage or outdoors, the user can perform a manual drainage treatment. When the user does not choose to automatically drain the water using the remote controller 600, the controller 800 determines NO in S12, and executes the processes after S26 in FIG.

  In S26, the controller 800 waits until the hot water tap 430 is opened in the mixing unit 200 with the path 92 side fully opened and the path 96 side fully closed. When the hot-water tap 430 is opened, the water supply amount sensor 16 becomes 2.7 liters / min or more, and the controller 800 determines YES in S26. Next, the controller 800 monitors that the amount of drainage exceeds the predetermined amount (S28). If YES in S28, the process proceeds to S20 in FIG.

  On the other hand, in the state of NO in S28, the controller 800 monitors the operation of the water cutoff treatment release switch 610 of the remote controller 600 (S30). Even if the amount of drainage from the hot water tap 430 does not reach the above-mentioned predetermined amount, the user can operate the water cutoff treatment release switch 610 when the drainage treatment is visually judged from the degree of turbidity of city water. it can. In this case, the controller 800 determines YES in S30, and proceeds to S20 in FIG. As a result, the drainage treatment is finished before the predetermined amount is drained.

  Further, the controller 800 monitors the operation of the water cutoff switch 620 of the remote controller 600 (S32). When the user determines that further drainage treatment is necessary from the degree of turbidity of city water by visual inspection during drainage from the hot water tap 430, the user can operate the water cutoff treatment switch 620. In this case, the controller 800 determines YES in S32, and resets the amount of water drained so far (integrated water amount) (S34). As a result, more city water than the predetermined amount is drained.

  In the present embodiment, even when the pressure switch 10 does not detect the occurrence of water breakage, the user can execute the wastewater treatment by operating the water breakage treatment switch 620 when the user feels the necessity of drainage. . In this case, the controller 800 determines YES in S40 of FIG. 2, and executes the process of S42. The process of S42 is the same as the process of S4. Next, similarly to S8, the controller 800 outputs information indicating that the water cutoff process is being performed to the remote controller 600 (S44). When S44 ends, the controller 800 executes the processes after S12 described above. In this case, the amount of city water drained (that is, the above-mentioned predetermined amount) cannot be determined from the water shutoff time, and thus is set to a predetermined fixed value. However, you may comprise so that a user can select the quantity of the city water drained.

  The hot water storage type hot water supply system 2 of the present embodiment has been described in detail. According to the present embodiment, the city water can be automatically drained into the bathtub 420 without causing the city water to flow into the hot water tank 300 when the water supply is restored (YES in S12 of FIG. 2). The inflow of muddy water to the hot water tank 300 can be prevented. Further, according to the present embodiment, when the water supply is restored, the city water can be drained from the hot water tap 430 without causing the city water to flow into the hot water storage tank 300 (NO in S12 of FIG. 2). In this case, unlike the case where water is automatically drained into the bathtub 420, the user needs to open the hot-water tap 430. However, the city water can be drained without flowing into the hot water tank 300. The user can select a hot water tap 430 as a drain destination.

  Furthermore, in this embodiment, the drainage can be terminated before the predetermined amount of drainage is performed (YES in S30 of FIG. 4). Further, in this embodiment, the drainage can be continued even if the predetermined amount is exceeded (YES in S32 of FIG. 4). In this embodiment, the longer the drainage time, the greater the amount of city water drained (the predetermined amount). The inflow of muddy water to the hot water tank 300 can be prevented more reliably. In the flowcharts of FIGS. 2 to 4 of the present embodiment, in the processing after S14 that is executed in the case of YES in S12 of FIG. 2, the drainage treatment release switch 610 and the drainage treatment switch 620 are operated to operate the drainage. It cannot be forcibly terminated or extended. However, in the case of NO in S16, the controller 800 may monitor the operation of the water cutoff treatment release switch 610 and the water cutoff treatment switch 620. If the water cutoff treatment release switch 610 is operated before YES is determined in S16, the controller 800 may proceed to S18 and end the drainage. In addition, if the water cutoff treatment switch 620 is operated before YES is determined in S16, the controller 800 may reset the accumulated water amount.

  As described above, the route 90 of the present embodiment is an example of a water supply route, the route 94, the route 22, and the route 24 are examples of a hot water supply route, and the mixing unit 200 is an example of a first opening / closing means. . Moreover, the pressure switch 10 is an example of a water cutoff detection means. In addition, when the user knows that the water stop is performed, the user can cause the water stop processing to be executed by operating the water stop processing switch 620 (YES in S40 of FIG. 2). Accordingly, the water cutoff treatment switch 620 is also an example of the water cutoff detection means. The processing of S4 and S42 executed by the controller 800 is an example of processing executed by the opening / closing control means. Moreover, the process of S14-S22 and the process of S26-S34 which the controller 800 performs are examples of the process which a drainage means performs. Furthermore, the operation of the water cutoff treatment release switch 610 is an example of the first operation, and the operation of the water cutoff treatment switch 620 is an example of the second operation. Further, the path 92, the path 94, the path 22, and the path 24 are examples of the drainage path, and the hot water filling valve 34 is an example of the second opening / closing means.

  Subsequently, a second embodiment will be described. In this embodiment, as shown in FIG. 1, a water stop valve 220 is interposed in the path 96. Furthermore, one end of a path 25 in which a drain valve 210 is interposed is connected to the path 96 on the supply port 100 side from the water stop valve 220. The other end of the path 25 is connected to, for example, a sewer or a water outlet. During normal use, the water stop valve 220 is opened, the drain valve 210 is closed, and water is supplied from the supply port 100 to the hot water tank 300.

  When water cutoff is detected by a signal from the pressure switch 10 or an operation of the water cutoff treatment switch 620, the controller 800 fully closes the water stop valve 220 and fully opens the drain valve 210. As a result, the city water sent from the supply port 100 after returning from the water stop can be drained to the path 25. The controller 800 determines the predetermined amount using the same method as in the first embodiment. When the predetermined amount of city water is drained, the controller 800 fully opens the water stop valve 220 and fully closes the drain valve 210.

  In the present embodiment, a predetermined amount of city water can be automatically drained from the path 25 without causing city water to flow into the hot water tank 300. The inflow of muddy water to the hot water tank 300 can be prevented. As in the first embodiment, drainage can be stopped or extended by user operation. Furthermore, it is also possible to perform drainage from the path 25 in the present embodiment together with drainage in the bathtub 420 and the hot water tap 430 in the first embodiment. In this case, the wastewater treatment time can be shortened. The water stop valve 220 is an example of a first opening / closing means, the path 25 is an example of a drainage path, and the drainage valve 210 is an example of a second opening / closing means.

  Subsequently, a third embodiment will be described. The controller 800 fully closes the valve on the path 96 side of the mixing unit 200 and opens the cistern water supply valve 70 and the cistern drainage valve 88 when the water supply is restored. Thereby, the city water sent from the supply port 100 can be drained to the cistern 60 after the water supply is restored. The controller 800 determines the predetermined amount using the same method as in the first embodiment. When the predetermined amount of city water is drained, the controller 800 closes the cistern water supply valve 70 and the cistern drainage valve 88 and releases the fully closed valve on the path 96 side of the mixing unit 200.

  In the present embodiment, a predetermined amount of city water can be automatically drained to the systern 60 without causing city water to flow into the hot water tank 300. As in the first embodiment, drainage can be stopped or extended by user operation. Further, in addition to the drainage from the bathtub 420 and the hot water tap 430 in the first embodiment and / or the drainage from the path 25 in the second embodiment, the drainage at the systern 60 in this embodiment can also be performed. is there. In this case, the wastewater treatment time can be shortened.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
Further, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2 Hot water storage type hot water supply system 10 Pressure switch 12 Pressure reducing valve 14 Water supply thermistor 16 Water supply sensor 18 Water supply servo 20 Path 22 Path 24 Path 25 Path 27 Path 30 Tank solenoid valve 32 Hot water thermistor 34 Hot water valve 36 Hot water sensor 38 Pump 40 Bath heat exchanger 56 Tank thermistor 58 Heating heat exchanger outlet thermistor 60 Sistern 62 Heating pump 64 Heating heat exchanger 66 Heating thermistor 68 Heating valve 70 for commemoration Heating valve 72 Circulating water thermistor 74 Solenoid valve 76 Circulating inlet thermistor 78 Circulating pump 80 Circulating water volume sensor 82 Circulating water volume servo 84 Burner 86 Solenoid valve 88 Sisturn drain valve 90 Path 92 Path 94 Path 96 Path 98 Solenoid valve 100 Supply port 200 Mixing unit 210 Drain valve 220 Stop valve 300 Hot water storage 400 heat load 410 heating terminal (heating radiator, etc.)
420 Bathtub 430 Hot-water tap 500 Hot-water storage unit 600 Remote control 610 Water-dissipation release switch 620 Water-dissipation treatment switch 630 Display 700 Waste heat recovery unit 702 Route 704 Route 800 Controller

Claims (6)

A hot water tank,
A water supply route that communicates with the city water supply port and supplies water to the hot water tank,
A hot water supply route for supplying hot water from a hot water tank,
A first opening / closing means disposed between the supply port and the hot water storage tank for opening and closing the water supply path;
A water outage detecting means for detecting water outage;
An opening / closing control means for controlling the first opening / closing means so as to close the water supply path when the water interruption detecting means detects water interruption;
A drainage means for draining a predetermined amount of city water supplied from the supply port in a state where the water supply path is closed;
A hot water storage hot water system.   The hot water storage hot water supply system according to claim 1, further comprising notification means for notifying that the drainage means is draining. It further comprises an operation means for performing an operation by the user,
The drainage means stops drainage before draining the predetermined amount of city water when a first operation is performed in the operation means during drainage of the predetermined amount of city water. The hot water storage type hot water supply system according to 1 or 2. It further comprises an operation means for performing an operation by the user,
The drainage means further drains the city water supplied from the supply port after the predetermined amount of city water is drained when the second operation is executed by the operation means. The hot water storage type hot water supply system according to any one of items 1 to 3. A drainage channel connected to the water supply channel;
A second opening / closing means for opening and closing the drainage path;
Further comprising
The hot water storage hot water supply system according to any one of claims 1 to 4, wherein the drainage means drains the predetermined amount of city water by controlling the second opening / closing means so as to open the drainage path. .   The hot water storage type hot water supply system according to any one of claims 1 to 5, wherein the predetermined amount increases as a period from the start to the end of water interruption increases.

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