JP6225815B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system.

  A hot water supply system having a function of chasing a bathtub is widely used by providing a bath heat exchanger that heats bathtub water guided from the bathtub (see, for example, Patent Document 1). In general, in such a hot water supply system, the temperature of the bath water on the inlet side of the bath heat exchanger is detected during the reheating operation, and the reheating operation is stopped when the temperature exceeds a target temperature. It is configured.

JP 2008-164247 A

  During chasing operation, when the temperature in the bathtub is uneven, or when the circulation port of the bathtub for introducing and deriving the bath water is covered with the body of the bather, etc. is there. In such a case, in the above-described conventional technology, a part of the bathtub water that has been heated in the bathtub has a low temperature region, and the temperature of the entire bathtub is not sufficiently increased. Is sent to the bath heat exchanger, and its temperature is detected on the inlet side to the bath heat exchanger, whereby the chasing operation may be stopped.

  The present invention has been made in order to solve the above-described problems, and in the case of a chasing operation, if the temperature in the bathtub is uneven, or the circulation port of the bathtub is temporarily in the body of the bather, etc. An object of the present invention is to provide a hot water supply system capable of raising the temperature of the entire interior of the bathtub even when the interior of the bathtub is difficult to be agitated.

A hot water supply system according to the present invention includes a bath water led from a bath and a heat exchanger for a bath that performs heat exchange with a heat source fluid, a bath circulation pump that circulates the bath water to the bath heat exchanger, and a heat source fluid A heat source side pump that circulates water in the bath heat exchanger, bath return temperature detection means that detects the temperature of the bath water on the inlet side of the bath heat exchanger, and control means that controls the bath circulation pump and the heat source side pump. The control means includes a heat source when the detected temperature of the return temperature detecting means reaches the first target temperature during a reheating operation for driving both the rotary circulation pump and the heat source side pump. The heat exchanger cooling operation for the bath that stops driving the side pump and drives the bath circulation pump is performed, and when the heat exchanger cooling operation for the bath is performed, the detected temperature of the bath return temperature detecting means is the first. Second target temperature lower than target temperature When below is carried out reheating operation again, the control means is for limiting the number of times to carry out the reheating operation again.

  According to the present invention, during the chasing operation, when the temperature in the bathtub is uneven, or when the circulation port of the bathtub is temporarily covered with the body of the bather, etc., the inside of the bathtub is difficult to be stirred, etc. However, it becomes possible to raise the temperature in the entire bathtub.

It is a block diagram which shows the hot water supply system of Embodiment 1 of this invention. It is a flowchart which shows an example of the control performed by the control part in Embodiment 1 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water supply system according to Embodiment 1 of the present invention. As shown in FIG. 1, a hot water supply system 1 according to the first embodiment includes a hot water storage tank 2, a heat source fluid circulation circuit 3, a heat source side pump 4, a bath water circulation circuit 5, a bath circulation pump 6, a bath heat exchanger 7, A bath return temperature detection means 8, a bath temperature detection means 9, a control unit 10 and a remote controller 11 are provided.

  The hot water storage tank 2 stores high-temperature water used as a heat source fluid in a reheating operation for heating the bathtub 20. The heat source fluid circulation circuit 3 connects the upper part of the hot water storage tank 2 and the heat source fluid inlet of the bath heat exchanger 7, and connects the heat source fluid outlet of the bath heat exchanger 7 and the lower part of the hot water storage tank 2. Between the heat source fluid outlet of the bath heat exchanger 7 and the lower part of the hot water storage tank 2, a heat source side pump 4 that sends the heat source fluid is disposed. The heat source side pump 4 may be arranged between the upper part of the hot water storage tank 2 and the heat source fluid inlet of the bath heat exchanger 7 instead of the illustrated configuration. By driving the heat source side pump 4, the heat source fluid circulation circuit 3 can circulate hot water as a heat source fluid to the bath heat exchanger 7.

  The bathtub water circulation circuit 5 is connected to the bathtub 20. The bathtub water circulation circuit 5 connects the circulation port 21 attached to the bathtub 20 and the bathtub water inlet of the bath heat exchanger 7, and connects the bathtub water outlet of the bath heat exchanger 7 and the circulation port 21 of the bathtub 20. Connecting. A bath circulation pump 6 for sending bath water is disposed between the circulation port 21 of the bath 20 and the bath water inlet of the bath heat exchanger 7. The bath circulation pump 6 may be disposed between the bath water outlet of the bath heat exchanger 7 and the circulation port 21 of the bath 20 instead of the illustrated configuration. By driving the bath circulation pump 6, the bath water circulation circuit 5 circulates the bath water led out from the bath 20 so as to return to the bath 20 via the bath heat exchanger 7.

  The bathtub water circulation circuit 5 includes a bath return temperature detecting means 8 for detecting the temperature of the bath water on the inlet side of the bath heat exchanger 7 and a bath for detecting the temperature of the bath water on the outlet side of the bath heat exchanger 7. Outward temperature detection means 9 is provided.

  The control unit 10 includes, for example, a microcomputer, a storage unit including a ROM, a RAM, a nonvolatile memory, and the like, an arithmetic processing device (CPU) that executes arithmetic processing based on a program stored in the storage unit, Control means comprising an input / output port for inputting / outputting external signals to / from the arithmetic processing unit. The control unit 10 is electrically connected to various actuators including the heat source side pump 4 and the bath circulation pump 6 and various sensors including the bath return temperature detection means 8 and the bath temperature detection means 9. . The control unit 10 controls the operation of the hot water supply system 1.

  The remote controller 11 is communicably connected to the control unit 10 and functions as a user interface. The remote controller 11 is installed in a kitchen or bathroom. The remote controller 11 is provided with a display unit that displays information such as a bath temperature and an operation unit such as a button. The user can instruct the chasing of the bathtub 20 by operating the remote controller 11.

  Although illustration is omitted, the hot water supply system 1 includes a heating device that heats water. The water heated by this heating device is stored in the hot water storage tank 2. This heating device may have any configuration such as a heat pump, a boiler, and an electric heater.

  The control unit 10 controls the follow-up operation and the bath heat exchanger cooling operation described below.

(Driving operation)
When the user operates the remote controller 11 to instruct the chasing of the bathtub 20, the control unit 10 first drives the bath circulation pump 6 to circulate the bathtub water in the bathtub water circulation circuit 5. Thereby, the temperature of the bath water in the bathtub 20 is measured by the bath return temperature detection means 8 by drawing the bath water in the bathtub 20 into the bath return temperature detection means 8. The control unit 10 sets, for example, a temperature 2 ° C. higher than the temperature measured by the return temperature detection means 8 as the first target temperature. Next, the control unit 10 drives the heat source side pump 4 to circulate the hot water in the hot water storage tank 2 to the heat source fluid circulation circuit 3 as a heat source fluid. In this way, the reheating operation in which both the heat source side pump 4 and the bath circulation pump 6 are driven is started. In the reheating operation, the heat source fluid of the heat source fluid circulation circuit 3 and the bathtub water of the bathtub water circulation circuit 5 exchange heat with the bath heat exchanger 7, and the bathtub water heated is supplied to the bathtub 20. The chasing operation continues until the temperature measured by the return temperature detecting means 8 reaches the first target temperature.

(Cooling operation of heat exchanger for bath)
The bath heat exchanger cooling operation is performed as an end operation after the temperature measured by the bath return temperature detecting means 8 in the reheating operation reaches the first target temperature. When the temperature measured by the return temperature detecting means 8 in the follow-up operation reaches the first target temperature, the control unit 10 stops the heat-source side pump 4 to end the follow-up operation. Thereafter, the controller 10 continues to drive only the bath circulation pump 6. Thus, the state where the heat source side pump 4 is stopped and the bath circulation pump 6 is driven is the bath heat exchanger cooling operation. The control unit 10 constantly measures the temperature of the bath water led out from the bathtub 20 by the bath return temperature detection means 8 during the bath heat exchanger cooling operation. When the temperature of the bath water measured by the bath return temperature detecting means 8 is lower than the second target temperature, the control unit 10 drives the heat source side pump 4 again to perform the chasing operation again. The second target temperature is a temperature lower than the first target temperature (for example, a temperature lower by 1 ° C. than the first target temperature).

  On the other hand, even if a predetermined standby time (for example, several tens of seconds to several minutes) elapses after the start of the bath heat exchanger cooling operation, the bath water temperature measured by the bath return temperature detecting means 8 is the second temperature. When the temperature does not fall below the target temperature, the bath circulation pump 6 is stopped to end the bath heat exchanger cooling operation. Thereby, the chasing of the bathtub 20 is completed.

  In the first embodiment, there is a limit on the number of times that the re-chase operation is performed again. In the first embodiment, the control unit 10 limits the number of re-chase operations to a predetermined upper limit number for a single re-chase instruction received from the remote controller 11. As a result, it is possible to reliably prevent the time until the chasing operation and the bath heat exchanger cooling operation are completed longer than necessary. That is, it is possible to reliably prevent the heat source side pump 4 and the bath circulation pump 6 from being driven for a longer time than necessary.

  Next, a specific example of control according to the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart illustrating an example of control executed by the control unit 10 in the first embodiment. When the control unit 10 receives an instruction for chasing the bathtub 20 from the remote controller 11, it first starts driving the bath circulation pump 6 (step S1). Thereby, the circulation of the bathtub water in the bathtub water circulation circuit 5 is started, and the bathtub water in the bathtub 20 is drawn into the return temperature detecting means 8. Next, the control unit 10 sets a first target temperature and a second target temperature (step S2). Here, the control unit 10 measures the temperature of the bath water by the bath return temperature detecting means 8, and sets the measured temperature, that is, a temperature higher by a predetermined temperature (for example, 2 ° C.) than the temperature of the bath 20 before reheating. Set as one target temperature. Further, the control unit 10 sets the second target to a temperature that is higher than the temperature measured by the return temperature detecting means 8, that is, the temperature of the bathtub 20 before reheating, and lower than the first target temperature by a predetermined temperature (eg, 1 ° C.). Set as temperature.

  Subsequently, the control unit 10 starts driving the heat source side pump 4 (step S3). Thus, the chasing operation is started, the heat source fluid of the heat source fluid circulation circuit 3 and the bathtub water of the bathtub water circulation circuit 5 exchange heat with the bath heat exchanger 7, and the heated bathtub water is supplied to the bathtub 20. Is done. During the follow-up operation, the controller 10 determines whether or not the temperature measured by the return temperature detecting means 8 has reached the first target temperature (step S4). If the temperature measured by the return temperature detecting means 8 in step S4 does not reach the first target temperature, the control unit 10 continues the chasing operation. When the temperature measured by the return temperature detecting means 8 in step S4 reaches the first target temperature, the control unit 10 stops the heat source side pump 4 and ends the chasing operation (step S4). S5).

  By stopping the heat source side pump 4 in step S5, the bath heat exchanger cooling operation state in which only the bath circulation pump 6 continues to drive is brought into a state. The control unit 10 performs the bath heat exchanger cooling operation with a predetermined waiting time (for example, several tens of seconds to several minutes) as a limit. The control unit 10 measures the temperature of the bath water by the bath return temperature detecting means 8 during the bath heat exchanger cooling operation, and determines whether or not the measured temperature is higher than the second target temperature ( Step S6).

  In step S6, when the temperature of the bathtub water measured by the bath return temperature detecting means 8 is equal to or lower than the second target temperature, the temperature in the bathtub 20 is not uniform for some reason, and the bathtub 20 It can be determined that there is a region where the temperature has not increased. In this case, it is preferable to perform the chasing operation again in order to raise the temperature in the entire bathtub 20. For this reason, in step S6, when the temperature of the bathtub water measured by the bath return temperature detecting means 8 becomes equal to or lower than the second target temperature, the control unit 10 first sets the upper limit of the number of re-chase operations. It is determined whether or not the number of times (for example, 3 times) has been reached (step S7). If the number of re-chase operations has not reached the upper limit number in step S7, the control unit 10 returns to step S3 and restarts the drive of the heat source side pump 4, thereby re-implementing the chase operation. As described above, when the chasing operation is performed again by returning from step S7 to step S3, the control unit 10 counts the number of times as the number of chasing operations.

  On the other hand, even if the waiting time has elapsed since the start of the heat exchanger cooling operation for the bath, the temperature of the bath water measured by the bath return temperature detecting means 8 did not become lower than the second target temperature in step S6. In the case, there is no region where the temperature is not increased in the bathtub 20, and it can be determined that the temperature in the entire bathtub 20 is increased. For this reason, the controller 10 determines that the temperature of the bath water measured by the bath return temperature detecting means 8 is the second target in step S6 even if the standby time has elapsed since the start of the bath heat exchanger cooling operation. If the temperature does not fall below the temperature, the bath circulation pump 6 is stopped to end the bath heat exchanger cooling operation (step S8). Thereby, the chasing of the bathtub 20 is completed.

  Moreover, the control part 10 is the case where the temperature of the bathtub water measured by the bath return temperature detection means 8 at step S6 becomes below 2nd target temperature, and the frequency | count of a re-chase operation is step S7. If the maximum number of times has been reached, the reheating operation is not performed again, and the flow goes to step S8 to stop the recirculation pump 6, thereby terminating the refrigerating heat exchanger cooling operation, and the additional bath 20 Complete the whisper. In this case, since the upper limit number of re-challenging operations has been carried out, the purpose of preventing the prolonging of the chasing operation due to the infinite circulation of this flow is set in step S6. Even if the temperature of the bath water measured in this step is lower than the second target temperature, the chasing may be completed.

  As described above, according to the first embodiment, when the temperature of the bath water measured by the bath return temperature detecting means 8 during the bath heat exchanger cooling operation is lower than the second target temperature. The chasing operation is performed again. For this reason, even when the temperature in the bathtub 20 is uneven, or when the circulation port 21 of the bathtub 20 is temporarily covered with a bather's body or the like, the inside of the bathtub 20 is difficult to be stirred. The entire temperature can be reliably increased.

  The hot water supply system 1 according to the first embodiment includes notification means for notifying the user that the reheating operation is being performed, for example, as follows. When the control unit 10 returns to step S3 from step S7 in FIG. 2 and performs the chasing operation again, a message or mark indicating that the chasing operation is performed again on the display unit of the remote controller 11 Is displayed or a voice notification is given from the speaker of the remote controller 11 that the chasing operation is being performed again. By doing so, it is possible to reliably prevent the user from misunderstanding that it is a malfunction when the re-running operation is performed again.

  In the present invention, the method for determining the first target temperature and the second target temperature is not limited to the method described above. For example, the first target temperature and the second target temperature may be determined based on the bathtub temperature set by the user using the remote controller 11.

  In Embodiment 1, the control when the user starts chasing the bathtub 20 by operating the remote controller 11 has been described. However, the present invention is not limited to such a case. The present invention can also be applied to control when the hot water supply system 1 automatically detects a temperature drop of 20 and starts chasing.

1 hot water supply system, 2 hot water storage tank, 3 heat source fluid circulation circuit, 4 heat source side pump, 5 bath water circulation circuit, 6 bath circulation pump, 7 bath heat exchanger, 8 bath return temperature detection means, 9 bath going temperature detection means, 10 control unit, 11 remote control, 20 bathtub, 21 circulation port

Claims (2)

A bath heat exchanger that performs heat exchange between the bath water led from the bath and the heat source fluid;
A bath circulation pump for circulating the bath water to the bath heat exchanger;
A heat source side pump that circulates the heat source fluid to the bath heat exchanger;
A bath return temperature detecting means for detecting the temperature of the bath water on the inlet side of the bath heat exchanger;
Control means for controlling the bath circulation pump and the heat source side pump;
With
When the detected temperature of the bottom return temperature detecting means reaches a first target temperature when the recirculation operation for driving both the bottom circulation pump and the heat source side pump is performed, Detection of the return temperature detection means when the heat exchanger cooling operation for the bath for driving the bath circulation pump is stopped by stopping the driving of the heat source side pump, and the heat exchanger cooling operation for the bath is performed. When the temperature falls below the second target temperature lower than the first target temperature, the chasing operation is performed again ,
The said control means is a hot water supply system which restrict | limits the frequency | count of implementing the said chasing operation again . Hot water supply system according to claim 1, further comprising an informing means for informing the user that has conducted the reheating operation again.

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