JP5148644B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater capable of discharging water to a bathtub.

With the recent increase in awareness of environmental protection, there is an increasing activity in the field of hot water heaters to reduce fuel gas consumption as much as possible.
Various means are conceivable as means for suppressing the consumption amount of the fuel gas. For example, a normal hot water supply circuit in which a heat exchanger is inserted and a dedicated circulation circuit for heating and circulating the heat medium are provided. The water heater has a means (liquid-liquid heat exchanger) for exchanging heat between the hot water in the circulation circuit and the hot water in the hot water circuit, and transfers the heat of the heat medium in the circulation circuit to the hot water in the hot water circuit. A method of making it possible is conceivable.

  Examples of the water heater provided with this type of liquid-liquid heat exchanger include a configuration in which heat can be exchanged between the downstream side of the heat exchanger of the hot water supply circuit and the circulation circuit by the liquid-liquid heat exchanger. (See Patent Publication 1).

JP 2007-187325 A

  In the technique described above, the heat of the combustion gas is transferred to the hot water in the hot water supply circuit, and then the heat of the heat medium in the circulation circuit is further transferred by the liquid-liquid heat exchanger. Although it has the effect of stabilizing the gas, it is difficult to say that it contributes to the suppression of gas consumption. This is because it is necessary to constantly heat and circulate the heat medium in the dedicated circulation circuit, which is not desirable from the viewpoint of energy saving.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a water heater that can effectively increase the water temperature on the hot water supply circuit side while suppressing energy consumption as much as possible. It is.

  In order to solve the above-described problem, the first configuration is a channel that circulates the supplied water and supplies water to a predetermined water supply location, and a water flow channel in which a part of the channel is a heating channel that is heated from the outside. And a circulation path that is connected to the bathtub and is capable of circulating hot water between the bathtub, a circulation pump that circulates the hot water stored in the bathtub between the bathtub and the circulation path, and In the water passage, heat exchange means for exchanging heat between water flowing upstream from the heating path and hot water flowing in the circulation path, and circulating the hot water stored in the bathtub by operating the circulation pump And a transmission control means for transmitting the heat of the hot water flowing through the circulation path to the water flowing through the water passage via the heat exchange means.

  If it is a water heater configured in this way, by circulating hot water stored in the bathtub to the circulation path, by performing heat exchange between this hot water and water supplied through the water passage, After preheating the water in the water passage, it is heated in the heating path. Therefore, when the hot water after use exists in the bathtub, the heat of the hot water after use is transferred to the water in the water channel, and the water temperature on the water channel side can be preheated.

In this way, heat after use in the bathtub that has conventionally been wasted can be used effectively, and energy consumption for heating the water flowing through the water passage can be suppressed.
Further, in this configuration, the timing for circulating the hot water stored in the bathtub is not particularly limited. However, from the viewpoint of energy saving, it is desirable to set the timing at which water actually flows through the water passage.

For this purpose, it is preferable to make the second configuration shown below the structure.
In a 2nd structure, the water supply detection means which detects the water supply to the said water supply location by the said water flow path is provided. And the said transmission control means operates the said circulation pump during the detection of the water supply by the said water supply detection means, and circulates the water stored by the said bathtub.

  With this configuration, water is actually supplied to the water passage, and the water in the bathtub is circulated through the circulation passage at a timing at which heat can be absorbed from the circulation passage through the heat exchange means. Suitable for minimizing the energy required to operate the pump.

Further, in the above respective configurations, it may be a third as configuration shown below.
The third configuration includes a water supply side water temperature detecting means for detecting the temperature of water flowing through the water passage, and a circulation side water temperature detecting means for detecting the temperature of hot water flowing through the circulation path or hot water stored in the bathtub. And. The transmission control means is configured to provide the circulation pump in the water supply through the water passage on the condition that the water temperature detected by the circulation side water temperature detection means is higher than the water temperature detected by the water supply side water temperature detection means. Is activated.

  With this configuration, heat exchange between the hot water flowing through the circulation path and the water flowing through the flow path is performed only when the hot water flowing through the circulation path is at a higher temperature than the water flowing through the circulation path. Therefore, it is possible to prevent the heat from being exchanged when the reverse relationship is established and the temperature of the water flowing through the water passage from being lowered.

  In this configuration, when detecting the temperature of hot water flowing through the circulation path, the temperature is detected by operating the circulation pump in advance and temporarily circulating hot water stored in the bathtub to the circulation path. In this case, after the temperature is detected in this way, the circulation pump is operated (continued) depending on whether the condition is satisfied.

Moreover, in the said structure, it was stored in the said bathtub by performing the heating of the circulating heating means which heats the hot water which distribute | circulates the said circulation path, the heating by the said circulating heating means, and the action | operation of the said circulating pump intermittently. If it is provided with heat insulation control means for hot water heat retention, a, it is preferable to the fourth as configuration shown below.

  In the fourth configuration, the transmission control means operates the circulation pump during detection of the water supply by the water supply detection means on condition that the hot water is not kept warm by the heat retention control means.

  In this configuration, even when hot water stored in the bathtub is kept warm, even if water supply in the water passage is detected, heat exchange between the hot water flowing through the circulation path and the water flowing through the water passage is not actively performed. I am doing so.

  Specifically, when the hot water stored in the bathtub is kept warm, the water is circulated intermittently between the circulation path and the bathtub. Heat exchange with flowing water is also performed intermittently. On the other hand, when warming the hot water stored in the bathtub, it can be said that heat exchange between hot water flowing through the circulation path and water flowing through the water passage is not performed, In terms of increasing the water temperature on the water channel side, it is considered that even during periods when heat exchange is not performed, hot water is circulated between the circulation path and the bathtub by operating the circulation pump to promote active heat exchange. It is done.

  However, such an active heat exchange acts to lower the temperature of the hot and cold water stored in the bathtub, and thus goes against the essential function of “heat retention”. Therefore, in the fourth configuration, even when the water supply in the water passage is detected when the hot water stored in the bathtub is kept warm, the heat exchange between the hot water flowing in the circulation path and the water flowing in the water passage is performed. It is possible not to perform it actively, so that heat retention can be given priority.

Further, the above arrangement may be like the fifth configuration shown below.
The fifth configuration includes a flow path for a bath that branches from the water flow path to the bathtub, a heat flow path that allows hot water heated by a solar light heater to flow through the water flow path, and the heat path from the heat path. A water passage valve that is provided in a path leading to the bathtub via a flow path for a bath, and that opens and closes the path to allow water to flow from the thermal path to the bathtub; Water flow control means for controlling the opening degree of the water flow valve during water flow to the water flow path to allow hot water from the heat path to flow into the bathtub.

If it is this structure, the hot water heated by the solar water heater can be dropped in a bathtub, and the heat of the warm water dropped in this way can be transmitted to the water which distribute | circulates a water channel.
Moreover, since the hot water heated by the solar heater can be stored in the bathtub, a dedicated reserve tank that is normally required in the solar heater is not required.

Further, in this configuration, the reservation setting means for setting the reservation time and the reservation temperature in response to a user operation, and the reserved temperature water set in the bathtub by the reservation time set by the reservation setting means. If you are provided a reservation operation means for performing a booking operation for storing, the can may be like the sixth configuration shown below.

  In the sixth configuration, the water flow control means passes hot water from the heat path to the bathtub before the reservation time arrives after the reservation time and the reservation temperature are set by the reservation setting means. Let water.

If it is this structure, by the arrival of reservation time, the heat of the warm water heated by the solar water heater can be dropped and stored in the bathtub.
Further, in this configuration, it is possible to pass hot water to the bathtub at any timing as long as the reservation time has arrived, but for example, to pass water at regular time intervals. It is possible to do.

For this purpose, it may be like the seventh configuration shown below the structure.
In this configuration, the water flow control means, after the reservation time and the reservation temperature are set by the reservation setting means, before the reservation time arrives, the hot water from the thermal path is supplied at regular intervals. Allow water to pass through.

With this configuration, water can be allowed to flow at regular time intervals before the reserved time arrives.
Further, in this configuration, it may be like the eighth configuration described below.

  In the eighth configuration, a hot water temperature detecting means for detecting the temperature of the hot water from the solar water heater is provided. And the said water flow control means allows the warm water from the said heat path to flow to the said bathtub at the time interval of the length according to the temperature detected by the said thermal side water temperature detection means.

With this configuration, it is desirable that the hot water from the solar water heater is passed through the hot water from the hot path to the bathtub in a shorter time interval as the temperature of the hot water is higher.
Because, the higher the temperature of the hot water from the solar heater, the shorter the time required to generate the hot water on the solar heater side. This is because, even if the time interval between the next and the next water flow is shortened, hot water having a sufficiently high temperature is generated until the next water flow is performed.

  In this case, while increasing the temperature of the hot water dropped into the bathtub from the solar heater by opening the water valve at a short time interval according to the temperature of the hot water from the solar heater. A lot of hot water can be stored in the bathtub in a shorter time.

Further, as described above, in the structure to be passed through a by controlling the opening of the water passage valve into the bathtub with hot water from the heat path, may be like the ninth configuration shown below.
In the ninth configuration, the water flow control means opens the water flow valve with a degree of opening less than a certain amount after the reservation time arrives after the reservation time and the reservation temperature are set by the reservation setting means. By doing, the warm water from the said heat path is made to flow into the said bathtub.

  If it is this structure, compared with the case where a water flow valve is fully opened, the amount of the warm water flowed from a solar water heater will decrease, and the time which water will stop at a solar water heater will be prolonged. For this reason, the temperature of the hot water dropped into the bathtub can be further increased.

Further, this configuration may be like the tenth configuration shown below.
The 10th structure is provided with the warm side water temperature detection means which detects the temperature of the warm water from the said solar heater. And the said water flow control means opens the water flow valve by the opening degree according to the temperature detected by the said thermal side water temperature detection means, and allows the hot water from the said heat path to flow into the said bathtub. .

If it is this structure, the temperature of the hot water from a solar water heater will be high, and the water flow from a heat path to a hot water bathtub will be performed in the state which enlarged the opening degree of the water flow path.
The higher the hot water from the solar water heater, the shorter the time it takes to generate the hot water on the solar water heater side. Even if the water flow is terminated, warm water having a sufficiently high temperature is generated until the next water flow.

Therefore, in this configuration, hot water having a high temperature can be stored in the bathtub in a shorter time by opening the water passage valve at an opening degree corresponding to the temperature of the hot water from the solar water heater.
Further, in each of the above configurations, a water supply heating means for heating the water flowing through the water passage, a water amount detecting means for detecting the amount of water flowing through the water passage, and a water amount detected by the water amount detection means are predetermined. while the is equal to or greater than the threshold value, when said includes a heating control means for heating the water, a by feedwater heating means, it is preferable to the 11th as Configuring shown below.

In the eleventh configuration, the water flow control means opens the water flow valve at an opening at which the amount of water on the path from the thermal path to the water path is less than the threshold value.
If it is this structure, it can prevent that the unnecessary heating by a feed water heating means will be implemented with the quantity of the water flowed from a heat path to a water flow path.

The figure which shows the whole structure of a water heater Flow chart showing first manual hot water supply operation Flow chart showing bath hot water operation Flow chart showing reserved operation Flow chart showing second manual operation The flowchart which shows the reservation driving | operation operation | movement in another embodiment. The flowchart which shows the hot water supply determination operation in another embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
(1) Overall configuration As shown in FIG. 1, the hot water heater has a hot water supply unit 1 that heats and supplies hot water, a warming unit 3 that keeps hot water stored in the bathtub 100, and the operation of each unit. And a control unit 5 for controlling.

  The hot water supply unit 1 includes a water passage 11 through which water supplied from the outside to the hot water outlet, a hot water supply side heat exchanger 13 inserted in the middle of the water passage 11, and a hot water supply side heat exchanger 13 in the water passage 11. The gas burner 15 etc. which heat the provided path | route (heating path) are comprised. In addition, in this embodiment, the bathtub 100 and the hot water tap 200 just below are hot water outlet locations.

  Among these, the water passage 11 is provided with an incoming water temperature detection sensor 17 for detecting the temperature of water supplied from the outside (water supply side water temperature) upstream of the hot water supply side heat exchanger 13, and downstream of the same path. Heating temperature detection sensors 19 for detecting the temperature of hot water heated through this path are provided at two locations on the side.

  Further, in the water passage 11, in order from the upstream side (water supply side), a strainer 21 that filters the supplied water, a water amount sensor 23 that detects the amount of water supplied, and a water amount control that controls the amount of water in the water passage 11. A valve 25 is provided.

  In addition, on the downstream side of the water passage 11 (on the side of the hot water location), a bath passage 27 leading to the bathtub 100 is branched, and the bath passage 27 is opened and closed. A dropped water amount sensor 29 is provided for detecting the amount of water (total amount) supplied to the bathtub 100 side through the bath-side water passage valve 28 for controlling the water flow and the flow path 27 for the bath.

  The water passage 11 is connected not only to a normal water supply source (water pipe) but also to a heat passage 310 for receiving water supplied from the solar heater 300, and a solar-side passage provided in the heat passage 310. By adjusting the opening of the water valve 312, the solar water heater 300 can selectively receive water. In addition, this heat path 310 is provided with a solar temperature detection sensor 314 that detects the temperature of the hot water supplied from the solar water heater 30 (solar water temperature).

  The heat retaining unit 3 is a circulation path 31 connected to the bathtub 100 as a path capable of circulating hot water between the bathtub 100 and a circulation pump that circulates the hot water stored in the bathtub 100 between the bathtub 100 and the circulation path 31. 33, from a heat retaining side heat exchanger 35 provided on the outer periphery of a partial path in the circulation path 31, a gas burner 37 for heating the path in the circulation path 31 provided with the heat retaining side heat exchanger 35, and a heating path of the water passage 11 The liquid-liquid heat exchanger 41 etc. which perform heat exchange between the water which distribute | circulates an upstream, and the hot water which distribute | circulates the circulation path 31 are comprised.

Among these, the circulation pump 33 is provided on the upstream side of the path through which hot water circulates in the circulation path 31, specifically, between the heat retaining side heat exchanger 35 and the bathtub 100.
The circulation path 31 is provided with a bathtub temperature detection sensor 45 for detecting the temperature of the hot water stored in the bathtub 100 (circulation side water temperature) on the upstream side of the path through which the hot water circulates, and downstream of the path. In addition, a heating temperature detection sensor 47 is provided for detecting the temperature of hot water heated via the path provided with the heat retaining side heat exchanger 35.

  The circulation path 31 is connected to the upstream side of the path through which hot water circulates, specifically, between the bathtub 100 and the circulation pump 33, and is supplied from the bathroom-bound path 27. The water to be discharged is dropped into the bathtub 100 through the circulation path 31 from this connection portion.

  In addition, the circulation path 31 has an upstream side of a path through which hot water circulates, specifically, a path between the circulation pump 33 and the heat retaining side heat exchanger 35 extends to the upstream side of the heating path of the water passage 11. The liquid-liquid heat exchanger 41 is disposed on the downstream side.

The control unit 5 includes a controller 51 that controls the operation of each unit using a built-in microcomputer, a main remote controller 53 that receives user operations outside the bathroom, a sub-remote controller 55 that receives user operations inside the bathroom, and the like. Among these, the sub remote controller 55 is provided with an outside air temperature detection sensor 57 that detects the outside air temperature around the bathtub 100.
(2) Operation of Water Heater The above-described water heater performs various operations described below by the controller 51 controlling the operation of each unit when receiving a user operation. The following operation is performed under the condition that the standby state (power on) is set.
(2-1) First Manual Hot Water Supply Operation First, the procedure of the first manual hot water supply operation started by opening the hot water tap 200 will be described with reference to FIG. The first manual hot water supply operation is a hot water supply operation performed when the first manual hot water supply mode for performing the first manual hot water supply operation is set by a specific operation on the main remote controller 53 or the sub remote controller 55.

  First, the controller 51 monitors the amount of water in the water passage 11 detected by the water amount sensor 23 and enters a standby state until the amount of water reaches a certain level (s130: NO). The “a certain amount or more” of water here is predetermined as the amount of water sufficient to heat the supplied water, as will be described below.

  When the amount of water detected by the water amount sensor 23 becomes equal to or greater than a certain level (s130: YES), the controller 51 starts heating the water passage 11 by the gas burner 15 (s140). The heating at this time is controlled so that the temperature detected by the heating temperature detection sensor 19 is maintained near a preset temperature.

  Thereafter, the controller 51 continues heating the water passage 11 by the gas burner 15 while the amount of water detected by the water amount sensor 23 is not less than a certain amount (s150: NO), and when the amount of water becomes less than a certain amount (s150: YES), the heating is stopped (s160).

The operation so far is repeated while the water heater is in a standby state (s130 to s160).
In addition, when the standby state of the water heater is released (power off), the heating of the water passage 11 by the gas burner 15 is stopped, and the first manual hot water supply operation is immediately terminated.
(2-2) Bath Hot Water Supply Operation Subsequently, the user starts the hot water supply to the main remote controller 53 or the sub-remote controller 55 by performing an operation (for example, a specific switch operation) for supplying hot water to the bathtub 100. The operation procedure will be described with reference to FIG.

First, the controller 51 forms a path from the water passage 11 to the bathtub 100 by opening the bath-side flow passage 27 in the bath-side water passage valve 28 (s210).
Next, the controller 51 operates the water amount control valve 25 to start entering water with a constant amount of water into the water passage 11 (s220).

  Thus, when the water flow into the water passage 11 is started, the controller 51 is in a standby state until the water amount detected by the water amount sensor 23 becomes equal to or higher than a certain level (s230: NO). YES), the controller 51 starts heating the water passage 11 by the gas burner 15 (s240). The heating at this time is controlled so as to be maintained near the set temperature as described above.

As a result, the hot water is discharged from the water passage 11 to the bathtub 100 via the bath-bound flow passage 27 and a part of the circulation passage 31.
Thereafter, the controller 51 continues heating the water passage 11 by the gas burner 15 until the total amount of water detected by the dropped water amount sensor 29 reaches a preset water amount (s250: NO). When the total amount of water reaches the set water amount (s250: YES), the heating is stopped (s260).

Next, the controller 51 stops the water entry into the water passage 11 by operating the water amount control valve 25 (s270).
Next, the controller 51 closes the path from the water flow path 11 to the bathtub 100 by closing the bath-side flow path 27 with the bath-side water flow valve 28 (s280).

  Thus, water entry into the water passage 11 is stopped (s270), the passage from the water passage 11 to the bathtub 100 is closed (s280), and heating of the water passage 11 by the gas burner 15 is stopped (s260). The bath water supply operation ends.

  Next, the controller 51 checks whether or not it is set to a “heat retention mode” in which the hot water stored in the bathtub 100 is kept warm (s310). The heat retention mode is an operation mode for retaining the hot water stored in the bathtub 100, and is set or canceled by a specific operation on the main remote controller 53 or the sub remote controller 55.

If the “heat retention mode” is not set (s310: NO), the bath hot water supply operation is terminated.
On the other hand, when the “heat retention mode” is set (s310: YES), the controller 51 monitors the temperature detected by the bathtub temperature detection sensor 45 and waits while the temperature is equal to or higher than the set temperature. (S320: YES, s330: NO). If the “warming mode” is canceled in this standby state (s330: YES), heating of the circulation path 31 by the gas burner 37 is terminated (s392), and the circulation of the hot water is stopped by stopping the circulation pump 33. (S394), the bath hot water supply operation ends. Note that the heating of the circulation path 31 (s392) and the hot water circulation stop (s394) are performed only when the heating of the circulation path 31 and the circulation of the hot water are started.

  On the other hand, when the temperature detected by the bathtub temperature detection sensor 45 is lower than the set temperature (s320: NO), the controller 51 starts the circulation of the hot water stored in the bathtub 100 by operating the circulation pump 33. At the same time (s340), heating of the circulation path 31 by the gas burner 37 is started (s350). The heating at this time is controlled so that the temperature detected by the heating temperature detection sensor 47 is maintained near the set temperature.

  Thus, while the temperature detected by the heating temperature detection sensor 47 is lower than the set temperature (s360: YES, s370: NO), the controller 51 circulates the hot water by the circulation pump 33 and the circulation path by the gas burner 37. Continue heating 31. If the “warming mode” is canceled while the heating is continued (s370: YES), the heating of the circulation path 31 by the gas burner 37 is terminated (s392), and the circulation of the hot water is stopped by stopping the circulation pump 33. After being made (s394), the bath hot water supply operation is terminated.

  When the temperature detected by the heating temperature detection sensor 47 becomes equal to or higher than the set temperature while the heating of the circulation path 31 by the gas burner 37 is continued (s360: NO), the controller 51 heats the circulation path 31 by the gas burner 37. While stopping (s380), circulation of the hot water by the circulation pump 33 is stopped (s390).

The heating start and stop of the circulation path 31 performed so far are repeated until the “warming mode” is canceled (s320 to s390).
If the hot water supply is released from the standby state during the hot water circulation and the heating of the circulation path 31, the circulation of the hot water by the circulation pump 33 and the heating of the circulation path 31 by the gas burner 37 are stopped. Immediately, the bath water supply operation ends.
(2-3) Reserved Driving Operation Next, a procedure of a reserved driving operation that is started when an operation for instructing a reserved driving is performed on the main remote controller 53 or the sub-remote controller 55 will be described with reference to FIG. This “operation for instructing reservation operation” is an operation for arbitrarily designating a reservation time and a reservation temperature and instructing that hot water at the reservation temperature should be stored in the bathtub 100 at the reservation time.

  First, the controller 51 sets (stores in the built-in memory) the designated reserved time and reserved temperature as parameters (set time and set temperature) for reserved operation (s400). Hereinafter, the reservation time and the reservation temperature set in this way are referred to as “set time” and “set temperature”.

  Next, the controller 51 checks the remaining time until the set time (s410), and if the remaining time is equal to or less than the threshold value (s410: YES), the same hot water supply operation as described above is performed. After (s420), the reserved driving operation is terminated.

  This “threshold value” is a value determined as the time required to store a set amount of hot water in the bathtub 100. Specifically, hot water at a set temperature is stored by the set time in the bath water supply operation. It is the time required to do.

  On the other hand, if the remaining time is longer than a predetermined threshold value (s410: NO), the controller 51 forms a water passage for passing hot water from the solar water heater 300 to the bathtub 100 (s430). Here, a path from the solar water heater 300 to the bathtub 100 is formed by opening the bath-side flow path 27 in the bath-side water valve 28 and opening the thermal path 310 in the sun-side water valve 312. At this time, water supply from a normal water supply source is configured to be blocked by a valve (not shown).

  Next, the controller 51 specifies the temperature (solar side water temperature) detected by the solar temperature detection sensor 314 (s440), and determines the control pattern of the water amount control valve 25 according to the temperature (s450).

  Here, for example, control such as a control pattern that repeatedly opens and closes the water amount control valve 25 at short time intervals according to the solar water temperature, a control pattern that opens the water amount control valve 25 at an opening degree according to the solar water temperature, and the like. A pattern is determined.

  These control patterns are patterns for continuously controlling the sun-side water valve 312 until the remaining time until the set time reaches a threshold value. After the control by this control pattern is performed, The remaining time until the set time is adjusted to be below the threshold.

  In the control pattern determined here, the water flow along the path from the heat path 310 to the water passage 11 is less than the amount of water at which the water passage 11 starts to be heated in the first and second manual hot water supply operations. The maximum opening in each water flow valve and the water amount control valve 25 is set.

Next, after performing the control of the water amount control valve 25 according to the control pattern determined as described above (s460), after performing the bath hot water operation similar to that described above (s420), the reserved operation is terminated. .
(2-4) Second Manual Hot Water Supply Operation Next, the procedure of the second manual hot water supply operation started by opening the hot water tap 200 will be described with reference to FIG. This second manual hot-water supply operation is a hot-water supply operation that is performed when the second manual hot-water supply mode for performing the second manual hot-water supply operation is set by a specific operation on the main remote controller 53 or the sub-remote controller 55.

  The second manual hot water supply operation is an operation prepared to be performed when hot water heated in the bath 100 is stored in the bath hot water operation described above and there is remaining hot water after using the hot water. The user performs the specific operation when the remaining hot water is present in the bathtub 100 after using the hot water stored in the bathtub 100.

  First, the controller 51 monitors the amount of water in the water passage 11 detected by the water amount sensor 23 and enters a standby state until water supply into the water passage 11 is started (s510: NO). If the water supply to is started (s510: YES), it is checked whether or not the amount of water related to the water supply is below a certain level (s520). The “less than a certain amount” of water here is predetermined as a value below the amount of water sufficient to heat the supplied water.

  Here, when the amount of water related to the water supply is greater than or equal to a certain value (s520: NO), the controller 51 starts the heating of the water passage by the gas burner in the first manual hot water supply operation (s140), and waits until the amount of water becomes less than a certain value. (S150: NO) After performing the same operation as the subsequent stop of heating by the gas burner (s160) (s640 to s660), the process returns to the check that the water supply into the water passage 11 is started ( s660 → s510).

Further, when the amount of water related to the water supply is less than a certain amount (s520: YES), the controller 51 checks whether or not the above-described “heat retention mode” is set (s530).
Here, when it is set to the “heat retention mode” (s530: YES), similarly to the above, heating of the water passage by the gas burner (s640), standby until the amount of water becomes below a certain level (s650: NO), and thereafter After stopping the heating by the gas burner (s660), the process returns to the check that the water supply into the water passage 11 is started (s660 → s510).

  Further, when the “heat retention mode” is not set (s530: NO), the controller 51 starts circulation of the hot water stored in the bathtub 100 by operating the circulation pump 33 (s540). In this way, hot water stored in the bathtub 100 circulates between the hot water and the circulation path 31, so that heat is exchanged between the hot water and water supplied through the water passage 11 in the liquid-liquid heat exchanger 41. It becomes like this.

  Thus, after the circulation of the hot water stored in the bathtub 100 is started, the controller 51 monitors the circulation side water temperature detected by the bathtub temperature detection sensor 45 and the water supply side water temperature detected by the incoming water temperature detection sensor 17. Then, it is checked whether or not the relationship between the two temperatures satisfies a circulation continuation condition defined as a condition for continuing the circulation of the hot water (s550). Here, the circulation continuation condition is satisfied when the circulation side water temperature is higher than the water supply side water temperature.

  When the circulation continuation condition is not satisfied (s550: NO), the controller 51 stops the circulation of the hot water stored in the bathtub 100 by stopping the operation of the circulation pump 33 (s560). Returning to the check that the water supply into the water passage 11 is started (s560 → s510).

  On the other hand, when the circulation continuation condition is satisfied (s550: YES), the controller 51 monitors the amount of water in the water passage 11 detected by the water amount sensor 23, and water supply into the water passage 11 is continued. It is checked whether or not there is (s570).

  Here, if the water supply into the water passage 11 is not continued (s570: NO), the controller 51 circulates the hot water stored in the bathtub 100 by stopping the operation of the circulation pump 33 as described above. After stopping (s560), it returns to the check that the water supply into the water passage 11 is started (s560 → s510).

  On the other hand, if the water supply into the water passage 11 is continued (s570: YES), the controller 51 monitors the water amount in the water passage 11 detected by the water amount sensor 23, and whether the water amount becomes a certain level or more. It is checked whether or not (s580). The “a certain amount or more” of water here is predetermined as the amount of water sufficient to heat the supplied water.

Here, if the amount of water related to the water supply is less than a certain value (s580: NO), the process returns to the check of whether or not the water supply into the water passage 11 is continued (s580 → s570).
Thereafter, the circulation continuation condition is satisfied (s550 “YES”), the water supply is continued (s570 “YES”), and the amount of water related to the water supply is less than a certain level (s580 “NO”), The operation of the circulation pump 33, that is, the heat exchange between the hot water flowing through the circulation path 31 and the water supplied through the water passage 11 is continued.

  Thereafter, when the amount of water related to the water supply becomes equal to or greater than a certain level (s580: YES), the controller 51 starts the heating of the water passage using the gas burner (s640) and waits until the amount of water becomes less than a certain level (s650: NO). ), And then the heating is stopped by the gas burner (s660).

Thereafter, the controller 51 stops the circulation of the hot water stored in the bathtub 100 by stopping the operation of the circulation pump 33 (s590), and checks that the water supply into the water passage 11 is started. Return (s590 → s510).
(3) Action and Effect With the water heater configured as described above, the hot water stored in the bathtub 100 is circulated through the circulation path 31 so that the hot water and the water supplied through the water passage 11 are exchanged. By performing heat exchange between them, the water in the water passage 11 is preheated and then heated in the heating path. Therefore, when hot water after use exists in the bathtub 100, the heat of the hot water after use is transferred to the water in the water passage 11, and the water temperature on the water passage 11 side is preheated and raised. be able to.

Thus, it is possible to effectively use the heat of the hot water after use in the bathtub, which has been discarded in the past, and to suppress energy consumption for heating the water flowing through the water passage.
Moreover, in the said embodiment, the water supply to the water flow path 11 is actually performed, and the hot water of the bathtub 100 is circulated at the timing which can absorb the heat from the circulation path 31 side via the liquid-liquid heat exchanger 41. Since it is circulated through the passage 31 (s510 to s540 in FIG. 5), it is suitable for minimizing the energy required for operating the circulation pump 33.

  Moreover, in the said embodiment, only when the hot water which distribute | circulates the circulation path 31 has a higher temperature than the water which distribute | circulates the water flow path 11, the water which flows through the circulation path 31, and the water which flows through the water flow path 11 are used. Since heat exchange is performed (s550 “YES” in FIG. 5), the heat exchange is performed when the reverse relationship is established, and the temperature of water flowing through the water passage 11 is prevented from being lowered. can do.

  Moreover, in the said embodiment, even if the water supply in the water flow path 11 is detected when the hot water stored in the bathtub 100 is kept warm in the heat retention mode, the hot water flowing through the circulation path 31 and the water flow path 11 flow. We do not actively exchange heat with water.

  Specifically, when the hot water stored in the bathtub 100 is kept warm, the hot water is circulated intermittently between the circulation path 31 and the bathtub 100 (s320 to s394 in FIG. 3). ), Heat exchange between hot water flowing through the circulation path 31 and water flowing through the water passage 11 is also intermittently performed. On the other hand, when the hot water stored in the bathtub 100 is kept warm, the heat exchange between the hot water flowing through the circulation path 31 and the water flowing through the water passage 11 is not performed intermittently. Therefore, in the sense of increasing the water temperature on the side of the water passage 11, the hot water is circulated between the circulation path 31 and the bathtub 100 by operating the circulation pump 33 even during a period in which heat exchange is not performed. It may be possible to promote heat exchange.

  However, such an active heat exchange acts to lower the temperature of the hot water stored in the bathtub 100, and thus goes against the essential function of “heat retention”. So, in the said embodiment, even if the water supply in the water flow path 11 is detected when the hot water stored in the bathtub 100 is insulated (s510 of FIG. 5), the hot water flowing through the circulation path 31 and the water flow path 11 are detected. Heat exchange with water flowing through the water is not actively performed (s530 “NO” → s640 in the same figure, and s540 to s590 are not performed), so that heat retention can be prioritized.

  Moreover, in the said embodiment, according to the remaining time until setting time, the hot water heated by the solar water heater 300 can be dropped into the bathtub 100 (s410-s460 of FIG. 4), and the heat of the hot water dropped in this way Can be transmitted to the water flowing through the water passage 11.

  Moreover, since the hot water heated by the solar water heater 300 can be stored in the bathtub 100, the dedicated reserve tank normally required in the solar water heater 300 becomes unnecessary.

  Moreover, in the said embodiment, the heat | fever of the hot water heated by the solar water heater 300 by the time of reservation time (set time) is reached by opening and closing the water amount control valve 25 by a fixed time interval or a fixed opening degree. Can be dropped into the bathtub 100 for storage.

  More specifically, in the case where the water amount control valve 25 is controlled with a control pattern that repeatedly opens and closes the water amount control valve 25 at short time intervals according to the solar water temperature, the hot water from the solar heater 300 is used. As the temperature is higher, the hot water from the heat path 310 is passed through the hot water bath at shorter time intervals.

  The higher the temperature of the hot water from the solar heater 300, the shorter the time required to generate the hot water on the solar heater 300 side. In this case, the water flow from the solar heater 300 Even if the time interval from the time when the water is passed to the next time the water is passed is shortened, hot water having a sufficiently high temperature is generated until the next time the water is passed.

  Therefore, the temperature of the hot water dropped into the bathtub from the solar heater 300 is increased by opening the solar water flow valve 312 at short time intervals according to the temperature of the hot water from the solar heater 300. However, much hot water can be stored in the bathtub in a shorter time.

  Further, when the water amount control valve 25 is controlled with a control pattern that opens the solar side water passage valve 312 with an opening degree corresponding to the solar side water temperature, the sun is simply compared with the case where the water amount control valve 25 is fully opened. Since the amount of hot water passed from the light heater 300 is reduced and the time during which the water is stopped and heated in the solar heater 300 is increased, the temperature of the hot water dropped into the bathtub 100 is further increased. be able to.

  Also, with this control pattern, the higher the temperature of the hot water from the solar water heater 300 is, the more water is passed from the heat path 310 to the hot water bath 100 with the water amount control valve 25 being opened. .

  The higher the temperature of the hot water from the solar water heater 300, the shorter the time required to generate hot water on the solar water heater 300 side. In this case, the opening degree of the water amount control valve 25 is increased. Even if the water flow is completed in a short time, hot water having a sufficiently high temperature is generated until the next water flow.

Therefore, the hot water having a high temperature can be stored in the bathtub 100 in a shorter time by opening the water amount control valve 25 at an opening degree corresponding to the temperature of the hot water from the solar heater 300.
Moreover, in the said embodiment, when performing the water flow from the solar water heater 300, the water flow of the path | route from the heat path 310 to the water path 11 is the heating of the water path 11 in the 1st, 2nd manual hot water supply operation | movement. The maximum opening degree in the water amount control valve 25 is set so as to be less than the water amount to be started (s450 and s460 in FIG. 4).

Therefore, it is possible to prevent unnecessary heating of the water passage 11 by the gas burner 15 due to the amount of water that flows from the heat passage 310 to the water passage 11.
(4) Modifications The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and can take various forms as long as they belong to the technical scope of the present invention. Needless to say.

  For example, in the embodiment described above, the outside air temperature around the bathtub 100 is directly detected by the outside air temperature detection sensor 57. However, the outside air temperature around the bathtub 100 may be estimated based on detection values of the bathtub temperature detection sensor 45, the heating temperature detection sensor 19, and the like, that is, may be detected indirectly.

  In the embodiment described above, the outside air temperature detection sensor 57 is provided in the sub-remote controller 55. However, the outside air temperature detection sensor 57 may be provided in components other than the sub-remote controller 55 or in the bathroom.

  Moreover, in the said embodiment, the circulating pump 33 is operated beforehand and the hot water stored in the bathtub 100 is temporarily circulated to the circulation path 31 (s540 of FIG. 5), and the hot water which distribute | circulates the circulation path 31 is obtained. The temperature (circulation side water temperature) is indirectly detected (s550 in the figure), and the operation of the circulation pump 33 is started according to the relationship between the circulation side water temperature and the water supply side water temperature (whether the circulation continuation condition is satisfied) ( Actually, it is continued) (s550 to s580 in the figure).

  However, if the circulation side water temperature can be directly detected, such as by providing a sensor near the connection point between the bathtub 100 and the circulation path 31, the operation of the circulation pump 33 is performed after checking whether the circulation continuation condition is satisfied. It may be started (s530 “YES” → s550 “YES” → s540).

  In the above embodiment, the second manual supply operation is performed when the second hot water supply mode is set. However, this second manual hot water supply operation is an operation until hot water from the solar water heater 300 is dropped into the bathtub 100 in the reserved operation regardless of whether or not the second hot water supply mode is set (FIG. 4). You may comprise so that it may be performed on condition that warm water is dropped into the bathtub 100 by s430-s460).

  For this purpose, first, in the reserved operation, when the dropping of the hot water from the solar heater 300 is completed (s430 to s460 in FIG. 4), “1” is set in the dropping end flag as shown in FIG. After that (s470), it waits until the remaining time is equal to or less than the threshold value (s480: NO), and after s480 or less (s480: YES), the process proceeds to s420. To. The “drop end flag” is a flag having an initial value “0”, and is returned to “0” even after the bath hot water supply operation is completed.

Further, as an operation performed when the second hot water supply mode is set, the following hot water supply determination operation is performed instead of the second manual hot water supply operation.
In this hot water supply determination operation, as shown in FIG. 7, the controller 51 first checks whether or not the bath hot water supply operation (FIG. 3) is performed (s710), and if the bath hot water supply operation is performed ( s710: YES), the process proceeds to the above-described first manual hot water supply operation (FIG. 2) (s720), but if the bath hot water supply operation is not performed (s710: NO), the solar cell heater 300 starts the reserved operation. It is determined based on the value of the dropping end flag described above whether or not the hot water has been dropped into the bathtub 100 (hot water has been filled) (s730).

  Here, if the hot water has not been dropped (s730: NO), the process proceeds to the first manual hot water supply operation (FIG. 2) described above (s720), while if it has been dropped (s730: YES), the second described above. The process proceeds to manual hot water supply operation (FIG. 5) (s740).

The hot water supply determination operation is performed in parallel with each of the first manual hot water supply operation and the second manual hot water supply operation, and whether or not the bath hot water supply operation is performed or whether or not the hot water has been dropped. Depending on the conditions such as, it may be configured to be switched from one of the first manual hot water supply operation and the second manual hot water supply operation to the other as appropriate.
(5) Correspondence with the present invention In the embodiment described above, the gas burner 15 is the feed water heating means in the present invention, the gas burner 37 is the circulating heating means in the present invention, the water flow valves 28, 312 and the water amount control valve. Reference numeral 25 denotes a water flow valve in the present invention, and the liquid-liquid heat exchanger 41 is a heat exchange means in the present invention.

  Moreover, s310-s394 of FIG. 3 is the heat retention control means in this invention, s410,440-s460 of FIG. 4 is the water flow control means in this invention, The figure s400 is the reservation setting means in this invention, S410 to s420 are reserved operation means in the present invention, s440 in FIG. 5 is a hot water temperature detecting means in the present invention, s540 to s590 in FIG. 5 are transmission control means in the present invention, s510, s570 is a water supply detection means in the present invention, s550 in the figure is a water supply side water temperature detection means and a circulation side water temperature detection means in the invention, and s580 and s650 are water quantity detection means in the invention, s640 in the figure. ˜660 is a heating control means in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply part, 3 ... Thermal insulation part, 5 ... Control part, 11 ... Water flow path, 13 ... Hot water supply side heat exchanger, 15 ... Gas burner, 17 ... Incoming water temperature detection sensor, 19 ... Heating temperature detection sensor, 21 ... Strainer, DESCRIPTION OF SYMBOLS 23 ... Water quantity sensor, 25 ... Water quantity control valve, 27 ... Bath flow path, 28 ... Bath side water flow valve, 29 ... Inflow water quantity sensor, 30 ... Solar water heater, 31 ... Circulation path, 33 ... Circulation pump, 35 Insulating side heat exchanger, 37 ... Gas burner, 41 ... Liquid-liquid heat exchanger, 45 ... Bathtub temperature detection sensor, 47 ... Heating temperature detection sensor, 51 ... Controller, 53 ... Main remote control, 55 ... Sub remote control, 57 ... Outside air temperature detection sensor, 100 ... tub, 200 ... hot water tap, 300 ... solar water heater, 310 ... heat path, 312 ... solar water passage valve, 314 ... solar temperature detection sensor.

Claims (13)

A water passage that circulates the supplied water and supplies water to a predetermined water supply location, and a water passage that is a heating route in which a part of the route is heated from the outside;
A circulation path that is connected to the bathtub and is capable of circulating hot water between the bathtub and
A circulation pump for circulating hot water stored in the bathtub between the bathtub and the circulation path;
Heat exchanging means for exchanging heat between water flowing upstream from the heating path in the water passage and hot water flowing through the circulation path;
Transmission control means for operating the circulation pump to circulate the water stored in the bathtub so as to transfer the heat of hot water flowing through the circulation path to the water flowing through the water passage via the heat exchange means. When,
Water supply detection means for detecting water supply to the water supply location through the water passage, and
The transmission control means operates the circulation pump during detection of water supply by the water supply detection means to circulate hot water stored in the bathtub,
further,
Circulation heating means for heating hot water flowing through the circulation path;
A heat retention control means for keeping warm the hot water stored in the bathtub by intermittently executing the operation of the circulation heating means and the operation of the circulation pump;
The water heater is characterized in that the transmission control means operates the circulation pump during detection of water supply by the water supply detection means on condition that the hot water is not kept warm by the heat retention control means . Water supply side water temperature detecting means for detecting the temperature of the water flowing through the water passage;
A circulating water temperature detecting means for detecting the temperature of the hot water flowing through the circulation path or the hot water stored in the bathtub, and
The transmission control means operates the circulation pump during water supply through the water passage on the condition that the water temperature detected by the circulation side water temperature detection means is higher than the water temperature detected by the water supply side water temperature detection means. The water heater according to claim 1 , wherein: A flow path for a bath that branches from the water passage to the bathtub,
A heat path for passing hot water heated by a solar water heater through the water path;
A water flow valve that is provided in a path from the thermal path to the bathtub via the flow path to the bath, and allows water to flow from the thermal path to the bathtub by opening and closing the path;
Water flow control means for controlling the opening degree of the water flow valve at the time of water flow from the heat path to the water flow path, thereby allowing hot water from the heat path to flow to the bathtub. The water heater according to claim 1 or 2 , characterized by the above. Feed water heating means for heating water flowing through the water passage;
Water amount detection means for detecting the amount of water flowing through the water passage;
Heating control means for heating water by the feed water heating means while the amount of water detected by the water quantity detection means is not less than a predetermined threshold,
The water flow control means of claim 3, wherein the amount of water path to the water passage from at least the thermal path to open the water passage valve in the open degree is less than the threshold value Water heater. A water passage that circulates the supplied water and supplies water to a predetermined water supply location, and a water passage that is a heating route in which a part of the route is heated from the outside;
A circulation path that is connected to the bathtub and is capable of circulating hot water between the bathtub and
A circulation pump for circulating hot water stored in the bathtub between the bathtub and the circulation path;
Heat exchanging means for exchanging heat between water flowing upstream from the heating path in the water passage and hot water flowing through the circulation path;
Transmission control means for operating the circulation pump to circulate the water stored in the bathtub so as to transfer the heat of hot water flowing through the circulation path to the water flowing through the water passage via the heat exchange means. When,
A flow path for a bath that branches from the water passage to the bathtub,
A heat path for passing hot water heated by a solar water heater through the water path;
A water flow valve that is provided in a path from the thermal path to the bathtub via the flow path to the bath, and allows water to flow from the thermal path to the bathtub by opening and closing the path;
A water flow control means for passing hot water from the heat path to the bathtub by controlling the opening of the water flow valve during water flow from the heat path to the water path;
Feed water heating means for heating water flowing through the water passage;
Water amount detection means for detecting the amount of water flowing through the water passage;
Heating control means for heating water by the feed water heating means while the amount of water detected by the water quantity detection means is not less than a predetermined threshold,
The water heater is characterized in that the water flow control means opens the water flow valve at an opening degree at which the amount of water in at least the path from the heat path to the water path is less than the threshold value . Water supply detection means for detecting water supply to the water supply location by the water passage,
The hot water heater according to claim 5 , wherein the transmission control means operates the circulation pump to circulate hot water stored in the bathtub during detection of water supply by the water supply detection means. Water supply side water temperature detecting means for detecting the temperature of the water flowing through the water passage;
A circulating water temperature detecting means for detecting the temperature of the hot water flowing through the circulation path or the hot water stored in the bathtub, and
The transmission control means operates the circulation pump during water supply through the water passage on the condition that the water temperature detected by the circulation side water temperature detection means is higher than the water temperature detected by the water supply side water temperature detection means. The water heater according to claim 5 or 6 , characterized in that: Circulation heating means for heating hot water flowing through the circulation path;
A heat retention control means for keeping warm the hot water stored in the bathtub by intermittently executing the operation of the circulation heating means and the operation of the circulation pump;
Said transmission control means, the condition that the hot water warming by heat keeping control means is not performed, claim 6 or claim, characterized in that operating the circulating pump in the water supply of the detection by the water supply detection means Item 8. A water heater according to item 7 . Reservation setting means for setting a reservation time and a reservation temperature in response to a user operation,
Reservation operation means for carrying out reservation operation for storing hot water of the set reservation temperature in the bathtub by the reservation time set by the reservation setting means,
The water flow control means allows hot water from the thermal path to flow into the bathtub before the reservation time arrives after the reservation time and the reservation temperature are set by the reservation setting means. The water heater according to any one of claims 3 to 8 . After the reservation time and the reservation temperature are set by the reservation setting means, the water flow control means passes hot water from the heat path to the bathtub at regular intervals before the reservation time arrives. The water heater according to claim 9 , wherein: A hot water temperature detecting means for detecting the temperature of hot water from the solar water heater,
The water flow control means is a length of the time interval in accordance with the temperature detected by the thermal-side coolant temperature detection means, according to claim 10, characterized in the hot water from the heat passage be passed through to the bath The water heater described in 1. After the reservation time and the reserved temperature are set by the reservation setting means, the water flow control means opens the water flow valve at an opening less than a certain amount before the reservation time arrives, thereby The hot water heater according to any one of claims 9 to 11 , wherein warm water from a road is passed through the bathtub. A hot water temperature detecting means for detecting the temperature of hot water from the solar water heater,
The water flow control means allows the hot water from the heat path to flow into the bathtub by opening the water flow valve at an opening degree corresponding to the temperature detected by the temperature side water temperature detection means. The water heater according to claim 12 , characterized in that

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