JP2015083906A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a failure when required temperature is changed from a high temperature side to a low temperature side.SOLUTION: A water heater includes: a tank; a hot water tapping path for feeding hot water from the tank to a heat source; a hot water supply path for feeding the hot water from the heat source to a hot water supply place; a bypass path for feeding the hot water from the hot water tapping path to the hot water supply path; a water supply path for supplying water to the hot water tapping path; a plurality of valves for adjusting a flow rate of each path respectively; a temperature sensor provided at the hot water tapping path or the hot water supply path; and a controller for controlling the heat source and the plurality of valves so that measured temperature by the temperature sensor becomes required temperature of a user. The controller, under a predetermined condition, stores a high/low switching flag when the required temperature is changed from the high temperature side to the low temperature side by striding over predetermined temperature, and while it stores the high/low switching flag, even when hot water of the temperature equal to or higher than the required temperature exists in the tank, it controls the plurality of valves and inhibits all the hot water tapped from the tank from being fed to the hot water supply path by passing through the bypass path.

Description

  The technology disclosed here relates to a hot water supply apparatus, and more particularly, to a hot water supply apparatus including a tank for storing hot water.

  Patent Document 1 discloses a hot water supply device. This hot water supply device has a tank for storing hot water, a hot water path connected to the tank at one end, a heat source connected to the other end of the hot water path, and a hot water source for heating the hot water from the tank, A path, a bypass path that bypasses the heat source from the hot water supply path to the hot water supply path, sends hot water, a water supply path that supplies water to the hot water supply path upstream of the connection between the hot water discharge path and the bypass path, and a hot water supply path from the tank The temperature of the hot water flowing through the hot water supply path or hot water supply path, and a plurality of valves for adjusting the flow rate from the hot water supply path to the heat source, from the hot water supply path to the bypass path, and from the water supply path to the hot water supply path, respectively A temperature sensor for measuring the temperature, a required temperature setting means for the user to set the required temperature for hot water supply, and a controller for controlling the heat source and the plurality of valves so that the temperature measured by the temperature sensor becomes the set required temperature. And a roller.

JP 2010-210178 A

  In the hot water supply apparatus having the above configuration, when the required temperature of hot water supply is changed from the high temperature side to the low temperature side, hot water having a temperature higher than the changed required temperature may be supplied. The present specification provides a technique that can solve or reduce this problem.

  If hot water above the required temperature is present in the tank, auxiliary heating with a heat source is usually not required. Therefore, in such a case, in the conventional hot water supply apparatus, all of the hot water discharged from the tank may be sent as it is to the hot water supply path through the bypass path. However, immediately after the required temperature of hot water supply is changed from the high temperature side to the low temperature side, high temperature hot water adjusted to the required temperature before the change remains in the hot water supply route or the bypass route. In this state, when all of the hot water discharged from the tank is sent to the hot water supply route through the bypass route, the hot water remaining in the hot water supply route and the bypass route is also sent to the hot water supply route as it is. As a result, hot water having a temperature higher than the changed required temperature is supplied.

  Based on the above findings, in the technology disclosed in the present specification, the required temperature is changed from the high temperature side to the low temperature side across the predetermined temperature in a situation where high temperature hot water can remain in the hot water supply route or the bypass route. Sometimes, even when hot water above the required temperature exists in the tank, the hot water and water flow (that is, a plurality of hot water discharged from the tank is not sent to the hot water supply path through the bypass path). Control). Thereby, at least a part of the hot water remaining in the hot water supply path or the bypass path is sent to the heat source, and is prevented from being sent to the hot water supply path as it is. Therefore, it is possible to prevent or reduce the problem that hot water having a temperature higher than the required temperature after the change is supplied.

  According to one aspect of the technology described above, the present specification discloses a hot water supply apparatus. This hot water supply device has a tank for storing hot water, a hot water path connected to the tank at one end, a heat source connected to the other end of the hot water path, and a hot water source for heating the hot water from the tank, Path, bypass path for sending hot water by bypassing the heat source from the hot water supply path to the hot water supply path, water supply path for supplying water to the hot water supply path, flow rate from the tank to the hot water supply path, flow rate from the hot water supply path to the heat source, hot water supply path A plurality of valves for adjusting the flow rate from the water supply path to the bypass route and the flow rate from the water supply route to the hot water supply route, a temperature sensor for measuring the temperature of hot water flowing through the hot water supply route or the hot water supply route, And a controller for controlling the heat source and the plurality of valves so that the temperature measured by the temperature sensor becomes the set required temperature.

  The controller stores a high / low switching flag when the required temperature is changed from the high temperature side to the low temperature side across the predetermined temperature under a predetermined condition. When the controller stores the high / low switching flag, the controller controls at least one of the plurality of valves even when hot water having a temperature higher than the required temperature exists in the tank so that all of the hot water discharged from the tank is It is prohibited to pass through the bypass route and be sent to the hot water supply route.

  According to the hot water supply apparatus described above, even when the required temperature is changed from the high temperature side to the low temperature side over the predetermined temperature, the hot water remaining in the hot water supply path or the bypass path is prohibited from being supplied as it is. Therefore, it is possible to prevent or reduce the problem that hot water having a temperature higher than the required temperature after the change is supplied.

  The above-mentioned predetermined conditions can be determined as appropriate in consideration of the configuration of the hot water supply apparatus and the like, so that high temperature hot water can remain in the hot water supply path and the bypass path. As an example, such a condition may be satisfied when the hot water supply operation is being performed at a required temperature higher than the predetermined temperature, or when the high temperature hot water supply operation is within a first predetermined time since the stop of the high temperature hot water supply operation. However, as another measure, the temperature of hot water remaining in the hot water supply route or the bypass route is actually measured, and when the measured temperature is within a predetermined range, the controller may be determined to be under a predetermined condition. .

  The controller stores when the first predetermined time has elapsed from the stop of the hot water supply operation or when the low temperature hot water supply operation at the required temperature lower than the predetermined temperature is continued for the second predetermined time. It is preferable to delete the high / low switching flag. Under such conditions, since the influence of the high temperature hot water supply operation has already disappeared, it is preferable to perform the normal hot water supply operation by deleting the high / low switching flag.

The figure which shows the structure of the hot water supply apparatus of Examples 1-3. The flowchart which shows the process which concerns on the memory | storage and deletion of the high / low switching flag which a controller performs in Examples 1-3. The flowchart which shows the process which concerns on the hot water supply operation which a controller performs in Example 1 with FIG. The flowchart which shows a part (common part) of the process which concerns on the hot water supply operation which a controller performs in Examples 1-3. The flowchart which shows the process which concerns on the hot water supply operation which a controller performs in Example 2 with FIG. The flowchart which shows the process which concerns on the hot water supply operation which a controller performs in Example 3 with FIG.

  In one embodiment of the present technology, when the controller stores the high / low switching flag, a plurality of hot water discharged from the tank passes through the heat source in a state where the operation of the heat source is stopped. It is preferable to control the valve. According to such a configuration, the hot water remaining in the hot water path is cooled while passing through the heat source. And the hot water remaining in the bypass route is not supplied as it is by joining the hot water cooled by the heat source.

  In an embodiment of the present technology, when the controller stores the high / low switching flag, the plurality of valves are set such that all of the hot water discharged from the tank passes through the heat source in a state where the operation of the heat source is stopped. May be controlled. According to such a configuration, all of the hot water remaining in the hot water path is cooled while passing through the heat source. Further, the hot water remaining in the bypass path does not join the hot water supply path. Therefore, the temperature of the hot water supplied to the hot water supply location can be further reduced.

  In one embodiment of the present technology, when the controller stores the high / low switching flag, a plurality of hot water from the tank is prohibited and only water supplied from the water supply path to the hot water path passes through the heat source. It is preferable to control the valve. According to such a configuration, when hot water remains in the hot water supply route or the bypass route, only hot water heated from the water by the heat source is supplied to the hot water supply location without using the hot water in the tank. As a result, it is possible to avoid the hot water remaining in the hot water supply path or the bypass path from being supplied as it is.

  In one embodiment of the present technology, when the controller stores a high / low switching flag and there is no hot water at a required temperature or higher in the tank, at least part of the hot water discharged from the tank passes through the bypass path. It is preferable to control the plurality of valves so as to pass through and be supplied to the hot water supply path. When the hot water in the tank is exhausted, it is assumed that the heat source was used in the high temperature hot water supply operation before changing the required temperature of the hot water supply. In this case, hot water higher than the required temperature may remain in the heat source and the hot water supply path extending from the heat source. Therefore, at least a part of the low temperature hot water from the tank may be supplied from the bypass path to the hot water supply path and merged with the remaining high temperature hot water. Thereby, it is possible to avoid the hot water remaining in the heat source or the hot water supply path from being supplied as it is.

  With reference to the drawings, a hot water supply apparatus 10 of Example 1 will be described. The hot water supply device 10 is a device that supplies hot water to hot water supply locations such as currants and bathtubs, and is particularly a so-called hot water storage type hot water supply device.

  As shown in FIG. 1, the hot water supply apparatus 10 includes a heat pump 20 and a tank 30 that stores hot water heated by the heat pump 20. The heat pump 20 is a first heat source of the hot water supply apparatus 10. The heat pump 20 and the tank 30 are connected to each other via a heat storage circulation path 22. The heat storage circulation path 22 is a conduit for circulating hot water between the heat pump 20 and the tank 30. A heat storage pump 24 is provided in the heat storage circulation path 22. The hot water in the tank 30 is sent to the heat pump 20, heated, and returned to the tank 30 again. The heat pump 20 and the heat storage pump 24 are electrically connected to a controller 100 described later, and the operation is controlled by the controller 100. The heat pump 20 is an example of a heat source that heats the hot water in the tank 30 and may be another heat source (for example, a combustion device, an electric heater, a generator, solar heat, geothermal heat, or the like). In addition, the tank 30 may store hot water supplied from the outside, and in this case, the hot water supply apparatus 10 does not need the heat pump 20 or another heat source replacing it.

  A plurality of tank temperature sensors 32 are provided in the tank 30 along the height direction. Each tank temperature sensor 32 measures the temperature of the hot water in the tank 30 at each height position. The plurality of tank temperature sensors 32 are electrically connected to the controller 100, and their output signals are input to the controller 100. The controller 100 can grasp the amount of hot water stored in the tank 30 based on the output signals of the plurality of tank temperature sensors 32. As the tank temperature sensor 32, a thermistor can be employed as an example.

  The hot water supply apparatus 10 includes a hot water supply path 40, a tank water supply path 34, and a hot water control valve 36. The hot water discharge path 40 is a pipe for discharging hot water in the tank 30, and its upstream end 40 a is connected to the upper part of the tank 30. The tank water supply path 34 is a pipeline that supplies tap water to the tank 30, and is connected to the lower part of the tank 30. The hot water control valve 36 is provided in the tank water supply path 34. The hot water control valve 36 can adjust the flow rate of the hot water discharged from the tank 30 to the hot water supply route 40 by adjusting the flow rate from the tank water supply route 34 to the tank 30. The hot water control valve 36 is electrically connected to the controller 100, and its operation is controlled by the controller 100.

  The hot water supply device 10 includes a combustion unit 50. The combustion unit 50 includes a combustion device 52 and a heating flow rate valve 54. The combustion device 52 is a second heat source of the hot water supply device 10 and includes a burner 52a that burns combustible gas, a sensible heat exchanger 52b, and a latent heat exchanger 52c. The combustion device 52 is connected to the downstream end 40 b of the hot water discharge path 40 and heats the hot water discharged from the tank 30. The heating flow rate valve 54 is provided in the hot water path 40 in the combustion unit 50, and can adjust the flow rate to the combustion device 52 through the hot water path 40. The heating flow rate valve 54 may be anything that can adjust the flow rate to the combustion device 52, and may be provided outside the combustion unit 50 in the hot water discharge path 40. The combustion device 52 and the heating flow rate valve 54 are electrically connected to the controller 100, and their operations are controlled by the controller 100. Combustion device 52 is an example of a heat source that heats hot water from tank 30, and may be another heat source (for example, a heat pump, an electric heater, a generator, or the like).

  The hot water supply apparatus 10 includes a hot water supply path 60, a bypass path 66, and a bypass valve 68. The hot water supply path 60 is a pipeline that sends hot water from the combustion device 52 to the hot water supply location, and extends from the combustion device 52 to the hot water supply location. The bypass path 66 is a pipe line that connects the hot water supply path 40 and the hot water supply path 60 to each other, and sends hot water by bypassing the combustion device 52 from the hot water supply path 40 to the hot water supply path 60. The bypass valve 68 is provided in the bypass path 66 and can adjust the flow rate of the bypass path 66. The bypass valve 68 is electrically connected to the controller 100, and its operation is controlled by the controller 100. The controller 100 controls both the heating flow rate valve 54 and the bypass valve 68 to adjust the ratio of the flow rate from the hot water route 40 to the combustion device 52 and the flow rate from the hot water route 40 to the bypass route 66. it can.

  The hot water supply apparatus 10 includes a mixed water supply path 70, a water control valve 72, and a flow rate sensor 38. The mixed water supply path 70 is a pipe that supplies water to the hot water supply path 40, branches from the tank water supply path 34, and is connected to the hot water supply path 40. The water control valve 72 is provided in the mixed water supply path 70, and can adjust the flow rate from the mixed water supply path 70 to the hot water supply path 40. The water control valve 72 is electrically connected to the controller 100, and its operation is controlled by the controller 100. The flow rate sensor 38 is provided in a common pipe line between the tank water supply path 34 and the mixed water supply path 70. The flow rate sensor 38 measures the flow rate of water supplied to the hot water supply device 10, that is, the flow rate of hot water supplied to the hot water supply location by the hot water supply device 10. The flow sensor 38 is electrically connected to the controller 100, and its output signal is input to the controller 100.

  The hot water supply device 10 includes a hot water temperature sensor 42, a hot water temperature sensor 62, and a flow rate sensor 38. The hot water temperature sensor 42 is provided in the hot water path 40 and measures the temperature of hot water flowing through the hot water path 40. The hot water temperature sensor 42 is disposed downstream of the connection position of the hot water supply path 40 and the mixed water supply path 70 and upstream of the connection position of the hot water supply path 40 and the bypass path 66. The hot water supply temperature sensor 62 is provided in the hot water supply path 60 and measures the temperature of the hot water flowing through the hot water supply path 60. The hot water supply temperature sensor 62 is disposed downstream of the connection position between the hot water supply path 60 and the bypass path 66. The hot water temperature sensor 42 and the hot water temperature sensor 62 are electrically connected to the controller 100, and their output signals are input to the controller 100.

  The hot water supply apparatus 10 includes a controller 100 and a remote controller 110. The remote controller 110 is a user interface and is connected to the controller 100. The remote controller 110 is an example of a required temperature setting unit, and the user can operate the remote controller 110 to set the required temperature for hot water supply. Although it is an example, in the hot water supply apparatus 10 of a present Example, the user can set the value to 38 degrees C-60 degrees C as the required temperature of hot water supply. The controller 100 controls the combustion device 52 and the valves 36, 54, 68, and 72 so that the temperature measured by the hot water temperature sensor 42 or the hot water supply temperature sensor 62 becomes the required temperature set by the remote controller 110.

  In the hot water supply device 10 configured as described above, immediately after the user changes the required temperature of hot water supply from the high temperature side to the low temperature side, the hot water adjusted to the required temperature before the change is supplied to the hot water supply path 40, the combustion device 50, The hot water supply path 60 and the bypass path 66 may remain. In such a case, if the same hot water supply operation as usual is performed, the remaining high temperature hot water is supplied as it is, and as a result, hot water higher than the changed required temperature is supplied.

  Regarding the above point, in the hot water supply apparatus 10 of the present embodiment, when the required temperature is changed from the high temperature side to the low temperature side over a predetermined temperature (for example, 55 degrees Celsius) under a predetermined condition, The controller 100 stores a “high / low switching flag” to that effect. Then, the controller 100 executes a hot water supply operation different from the normal time (that is, when the high / low switching flag is not stored) while the high / low switching flag is stored. As a result, hot water remaining in the hot water supply path 40 and the bypass path 66 is prevented from being supplied as it is.

  First, with reference to FIG. 2, a process related to storing and erasing the high / low switching flag will be described. For example, when the user opens the currant and the flow rate measured by the flow sensor 38 exceeds a predetermined value (for example, 2.7 liters per minute), the controller 100 starts a hot water supply operation. When the flow rate measured by the flow rate sensor 38 falls below the predetermined value, the controller 100 stops the hot water supply operation. The controller 100 executes the process related to the high / low switching flag shown in FIG. 2 in parallel with the process related to the hot water supply operation.

  As shown in FIG. 2, the controller 100 is in a hot water supply operation (YES in S10) and when the required temperature set by the remote controller 110 is higher than a predetermined temperature (for example, 55 degrees Celsius) (in S12). YES), “high temperature hot water supply flag” is stored (S14). That is, when a hot water supply at a required temperature higher than a predetermined temperature (hereinafter referred to as a high temperature hot water supply) is actually performed, a high temperature hot water supply flag is stored. If the controller 100 has already stored the high / low switching flag, the controller 100 deletes the stored high / low switching flag (S16).

  When the controller 100 is in the hot water supply operation (YES in S10) and the set required temperature is lower than the predetermined temperature (NO in S12), the controller 100 checks whether or not a high temperature hot water supply flag is stored ( S18). And if the controller 100 has memorize | stored the high temperature hot water supply flag (it is YES at S18), it will memorize | store a high / low switching flag in principle (it is YES at S20) (S22). However, when hot water supply at a required temperature lower than the predetermined temperature (hereinafter referred to as low temperature hot water supply) continues for two minutes (NO in S20), the stored high temperature hot water supply flag and high / low switching flag are erased. (S24, S26). Here, the above-mentioned time of two minutes is an example of the second predetermined time, and can be changed as appropriate.

  Even when the controller 100 is not in the hot water supply operation (NO in S10), when the high temperature hot water supply flag is stored (YES in S28), the controller 100 executes the process related to the high / low switching flag. That is, the controller 100 continues to hold the stored high temperature hot water supply flag until eight minutes have passed since the hot water supply was stopped (NO in S30). When the required temperature is set lower than the predetermined temperature (YES in S32), the controller 100 stores a high / low switching flag (S22). On the other hand, when eight minutes have passed since the hot water supply stop, the stored high temperature hot water supply flag and high / low switching flag are deleted (S24, S26). Here, the time of eight minutes is an example of the first predetermined time, and can be changed as appropriate.

  When the required temperature is changed from the high temperature side to the low temperature side in the middle of the high temperature hot water supply operation or for 8 minutes after the high temperature hot water supply operation is stopped by the above processing, the controller 100 switches between high and low. Remember the flag. That is, the high / low switching flag indicates that the required temperature has been changed as described above under a condition in which high-temperature hot water can remain in the hot water supply route 40 and the bypass route 66. The stored high / low switching flag is erased when eight minutes (first predetermined time) has elapsed since the hot water supply operation was stopped, or when low temperature hot water supply operation was continued for two minutes (second predetermined time). Until then. That is, the high / low switching flag remains in effect even after the hot water supply operation is stopped while hot water can remain in the hot water supply route 40, the combustion device 50, the hot water supply route 60, the bypass route 66, etc. Retained.

  Next, with reference to FIGS. 3 and 4, processing related to the hot water supply operation executed by the controller 100 will be described. As described above, the controller 100 changes the content of the hot water supply operation according to whether or not the high / low switching flag is stored. When the flow rate measured by the flow sensor 38 exceeds a predetermined value (for example, 2.7 liters per minute), the controller 100 starts the hot water supply operation (YES in S40).

  If hot water above the required temperature exists in the tank 30 (YES in S42) and the high / low switching flag is not stored (NO in S44), the controller 100 fully opens the bypass valve 68 (S46), and the heating flow rate The valve 54 is closed (S48), and the operation of the combustion device 52 is prohibited (S50). That is, the controller 100 controls the valves 54 and 68 so that all the hot water discharged from the tank 30 is sent to the hot water supply path 60 through the bypass path 66. Since it is not necessary to heat the hot water in the tank 30, the combustion device 52 is not used. Then, the controller 100 controls the hot water control valve 36 and the water control valve 72 so that the temperature measured by the hot water temperature sensor 42 becomes equal to the required temperature, and the hot water from the tank 30 and the water from the mixed water supply path 70. The mixing ratio is adjusted (S52). Such a hot water supply operation is conventionally known and is not particularly limited.

  On the other hand, when hot water at the required temperature or higher exists in the tank 30 (YES in S42) and the high / low switching flag is stored (YES in S44), the controller 100 sets the bypass valve 68 half open (S102), The heating flow valve 54 is opened (S104), and the operation of the combustion device 52 is prohibited (S106). That is, the controller 100 controls the valves 54 and 68 so that a part of the hot water discharged from the tank 30 is sent to the combustion device 52 from the hot water discharge path 40 even if the temperature is higher than the required temperature. The hot water sent to the stopped combustion device 52 is dissipated and becomes low temperature, and joins the hot water from the bypass path 66 in the hot water supply path 60. Thereafter, the controller 100 controls the hot water control valve 36 and the water control valve 72 so that the temperature measured by the hot water supply temperature sensor 62 becomes equal to the required temperature (S108). The mixing ratio between the hot water from the tank 30 and the water from the mixed water supply path 70 is adjusted by the hot water control valve 36 and the water control valve 72.

  If there is no hot water above the required temperature in the tank 30 (NO in S42) and the high / low switching flag is not stored (NO in S56), the controller 100 closes the bypass valve 68 (S58) and heats up. The flow valve 54 is opened (S60), and the operation of the combustion device 52 is started (S62). That is, the controller 100 controls the valves 54 and 68 so that all the hot water discharged from the tank 30 is sent from the hot water path 40 to the combustion device 52. Hot water or water sent to the combustion device 52 is heated in the combustion device 52 and supplied through the hot water supply path 60. Then, the controller 100 controls the combustion device 52 so that the temperature measured by the hot water supply temperature sensor 62 becomes equal to the required temperature (S64). Such a hot water supply operation is conventionally known and is not particularly limited.

  On the other hand, when there is no hot water above the required temperature in the tank 30 (NO in S42) and the high / low switching flag is stored (YES in S56), the controller 100 sets the bypass valve 68 half open (S110). Then, the heating flow rate valve 54 is opened (S112), and the operation of the combustion device 52 is started (S114). That is, the controller 100 controls the valves 54 and 68 so that a part of the hot water discharged from the tank 30 is sent from the bypass path 66 to the hot water supply path 60 even if the temperature is lower than the required temperature. When there is no hot water above the required temperature in the tank 30, it is presumed that the combustion device 52 was used in the previous high-temperature hot water supply operation. In this case, hot water higher than the current required temperature may remain in the combustion device 52 and the hot water supply path 60 extending therefrom. Therefore, the controller 100 sends at least a part of the low temperature hot water from the tank 30 to the hot water supply path 60 from the bypass path 66 and joins the remaining high temperature hot water. Thereafter, the controller 100 controls the combustion device 52 and the bypass valve 68 so that the temperature measured by the hot water supply temperature sensor 62 becomes equal to the required temperature (S116).

  The controller 100 continues the hot water supply operation by the processing shown in FIGS. 3 and 4 until the measured flow rate by the flow sensor 38 falls below the predetermined value (NO in S54), and the hot water supply operation when the measured flow rate falls below the predetermined value. Is stopped (YES in S54).

  As described above, the hot water supply apparatus 10 according to the present embodiment changes the content of the hot water supply operation depending on whether or not the high / low switching flag is stored when hot water having a temperature higher than the required temperature exists in the tank 30 (see FIG. 3). ). That is, during normal times (when the high / low switching flag is not stored), if hot water having a temperature higher than the required temperature exists in the tank 30, all the hot water discharged from the tank 30 is bypassed as in the conventional hot water supply device. 66 is supplied to hot water supply path 60. This is because it is not necessary to heat with the combustion device 52. On the other hand, when the high / low switching flag is stored, all hot water discharged from the tank 30 is prohibited from passing through the bypass path 66 and being sent to the hot water supply path 60. Specifically, a part of the hot water discharged from the tank 30 is supplied to the stopped combustion device 52. At this time, the combustion device 52 is used not as a heat source for heating hot water but as a radiator. The low temperature hot water from the combustion device 52 is mixed with the high temperature hot water remaining in the hot water discharge path 40 and the bypass path 66 to prevent the high temperature hot water remaining in the apparatus from being supplied as it is.

  Similarly, the hot water supply apparatus 10 of the present embodiment changes the content of the hot water supply operation depending on whether or not the high / low switching flag is stored even when there is no hot water at the required temperature or higher in the tank 30 (see FIG. 4). . That is, during normal times (when the high / low switching flag is not stored), if no hot water above the required temperature exists in the tank 30, all the hot water discharged from the tank 30 is discharged as in the conventional hot water supply device. Supply from the path 40 to the combustion device 52. This is because sufficient heating is performed by the combustion device 52. On the other hand, when the high / low switching flag is stored, a part of the hot water discharged from the tank 30 is supplied from the bypass path 66 to the hot water supply path 60 without being sent to the combustion device 52. At this time, hot water having a temperature lower than the required temperature flows through the bypass path 66, unlike the original. The low temperature hot water from the bypass path 66 is mixed with the high temperature hot water remaining in the combustion device 52 and the hot water supply path 60 to prevent the high temperature hot water remaining in the apparatus from being supplied as it is.

  With reference to FIG. 5, the hot-water supply apparatus of Example 2 is demonstrated. Since the hot water supply apparatus according to the second embodiment has the configuration shown in FIG. 1 as in the first embodiment, a duplicate description is omitted here. In the hot water supply apparatus according to the second embodiment, a part of the process related to the hot water supply operation executed by the controller 100 is changed as compared with the first embodiment. In the following, in the processing shown in FIG. 5, the changed part will be mainly described, and the description of the common part to which the same reference numerals as those in FIG.

  As shown in FIG. 5, in the hot water supply apparatus of the second embodiment, when there is hot water at the required temperature or higher in the tank 30 (YES in S42) and a high / low switching flag is stored (YES in S44), the controller 100 closes the bypass valve 68 (S122), opens the heating flow valve 54 (S124), and prohibits the operation of the combustion device 52 (S126). That is, the controller 100 controls the valves 54 and 68 so that all the hot water discharged from the tank 30 is sent from the hot water path 40 to the stopped combustion device 52. Since the bypass valve 68 is closed, the hot water remaining in the bypass path 66 remains in place. The hot hot water remaining in the hot water supply path 40 is sent to the stopped combustion device 52. The hot water sent to the stopped combustion device 52 is supplied with heat through the hot water supply path 60 after radiating heat and becoming low temperature. Thereby, it is possible to prevent the hot water remaining in the hot water supply path 40 and the bypass path 66 from being supplied as it is.

  As in the first embodiment, when the hot water supply apparatus of the second embodiment stores the high / low switching flag, even when hot water having a temperature higher than the required temperature exists in the tank 30, all of the hot water discharged from the tank 30 is The situation where the hot water supply route 60 is sent through the bypass route 66 is prohibited. In particular, in the hot water supply apparatus according to the second embodiment, all the hot water discharged from the tank 30 is sent to the stopped combustion apparatus 52. Even with such a configuration, it is possible to prevent the hot water remaining in the hot water supply path 40 and the bypass path 66 from being supplied as it is.

  In the case where there is no hot water at the required temperature or higher in the tank 30, the processing shown in FIG. 4 is executed according to whether or not the high / low switching flag is stored, as in the first embodiment. The same applies to Example 3 described later.

  With reference to FIG. 6, the hot water supply apparatus of Example 3 is demonstrated. Since the hot water supply apparatus according to the third embodiment has the configuration illustrated in FIG. 1 as in the first embodiment, a duplicate description is omitted here. In the hot water supply apparatus according to the third embodiment, a part of the process related to the hot water supply operation executed by the controller 100 is changed as compared with the first embodiment. In the following, in the processing shown in FIG. 6, the changed part is mainly described, and the description of the common part to which the same reference numeral as that in FIG. 3 is given is omitted.

  As shown in FIG. 6, in the hot water supply apparatus of the third embodiment, when there is hot water at the required temperature or higher in the tank 30 (YES in S42) and the high / low switching flag is stored (YES in S44), the controller 100 closes the hot water control valve 36 and fully opens the water control valve 72 (S130), closes the bypass valve 68 (S132), opens the heating flow valve 54 (S134), and starts the operation of the combustion device 52. (S136). That is, the controller 100 prohibits the hot water from the tank 30 and controls the valves 36, 54, 68 and 72 so that only the water from the mixed water supply path 70 is sent to the combustion device 52. Then, the controller 100 controls the combustion device 52 so that the temperature measured by the hot water supply temperature sensor 62 becomes equal to the required temperature (S138).

  As in the first embodiment, the hot water supply apparatus according to the third embodiment bypasses all the hot water discharged from the tank 30 even when hot water having a temperature higher than the required temperature exists in the tank 30 when the high / low switching flag is stored. The situation of passing through the route 66 and being sent to the hot water supply route 60 is prohibited. In particular, the hot water supply apparatus according to the third embodiment is characterized in that hot water from the tank 30 is prohibited and only water from the mixed water supply path 70 is heated by the combustion apparatus 52 to supply hot water. According to such a configuration, the hot water remaining in the hot water supply path 40 or the bypass path 66 remains as it is or passes through the combustion device 52 and passes through the bypass path 66 and is supplied as it is. Absent.

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  For example, in each of the above-described embodiments, the content of the hot water supply operation is changed depending on whether or not the high / low switching flag is stored, whether or not hot water at the required temperature or higher exists in the tank 30. However, as another embodiment, the hot water supply operation is changed depending on whether or not the high / low switching flag is stored only when hot water at a required temperature or higher is present in the tank 30 or only when the hot water is not present. It is good also as a structure.

  The technical elements described in this 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 can achieve a plurality of objects at the same time, and achieving one of the objects itself has technical utility.

DESCRIPTION OF SYMBOLS 10: Hot water supply apparatus 20: Heat pump 30: Tank 36: Hot water control valve 40: Hot water supply path 42: Hot water supply temperature sensor 52: Combustion apparatus 54: Heating flow rate valve 60: Hot water supply path 62: Hot water supply temperature sensor 66: Bypass path 68: Bypass valve 70: Mixed water supply path 72: Water control valve 100: Controller 110: Remote control

Claims (6)

A tank for storing hot water,
A hot water path with one end connected to the tank,
Connected to the other end of the hot water path, a heat source for heating hot water from the tank,
A hot water supply route for sending hot water from a heat source to a hot water supply location;
A bypass route that bypasses the heat source from the hot water supply route to the hot water supply route and sends hot water;
A water supply path for supplying water to the hot water supply path upstream of the connection between the hot water supply path and the bypass path;
A plurality of valves for adjusting the flow rate from the tank to the hot water route, the flow rate from the hot water route to the heat source, the flow rate from the hot water route to the bypass route, and the flow rate from the water supply route to the hot water route,
A temperature sensor for measuring the temperature of hot water flowing through the hot water supply path or hot water supply path;
A required temperature setting means for the user to set the required temperature for hot water supply;
A controller that controls the heat source and the plurality of valves so that the temperature measured by the temperature sensor becomes the set required temperature,
The controller is
When the required temperature is changed from the high temperature side to the low temperature side across the predetermined temperature under a predetermined condition, the high / low switching flag is stored,
When the high / low switching flag is stored, even when hot water above the required temperature exists in the tank, at least one of the valves is controlled so that all of the hot water discharged from the tank passes through the bypass path. And prohibit it from being sent to the hot water supply route,
Hot water supply device.   2. The hot water supply apparatus according to claim 1, wherein the predetermined condition is during a high temperature hot water supply operation at a required temperature higher than the predetermined temperature, or within a first predetermined time from the stop of the high temperature hot water supply operation.   The controller stores when the first predetermined time has elapsed from the stop of the hot water supply operation or when the low temperature hot water supply operation at the required temperature lower than the predetermined temperature is continued for the second predetermined time. The hot water supply device according to claim 1 or 2, wherein the high / low switching flag is erased.   When the controller stores the high / low switching flag, the controller controls at least one of the plurality of valves so that at least part of the hot water discharged from the tank passes through the heat source while the operation of the heat source is stopped. The hot water supply device according to any one of claims 1 to 3.   When the controller stores the high / low switching flag, the controller controls at least one of the plurality of valves so that all of the hot water discharged from the tank passes through the heat source in a state where the operation of the heat source is stopped. The hot water supply device according to any one of claims 1 to 4.   When the controller stores the high / low switching flag, the hot water from the tank is prohibited, and at least one of the plurality of valves is controlled so that only water supplied from the water supply path to the hot water path passes through the heat source. The hot water supply device according to any one of claims 1 to 3.

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