JP2018189305A - Bath hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a tepid bath gives discomfort to a person when the person has to take a bath because bath temperature further falls down while the person washes his/her body after entering a bathroom if the bathroom temperature has already fallen down when the person enters the bathroom because a pump is unconditionally stopped when it is determined that the person enters the bathroom regardless of the temperature of hot water of a bath.SOLUTION: If entrance determination means 35 determines entrance of a person during reheating operation, temperature change means 30 lowers a preset reheating target temperature, and reheating control means 29 continues reheating operation in the case that bath temperature is lower than the reheating target temperature, and stops the reheating operation in the case that the bath temperature is higher than the reheating target temperature.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a bath water heater, and more specifically to a bath water heater with a built-in bath heater that automatically repels water (hot water) stretched in a bathtub.

  Conventionally, in bath water heaters that detect human bathing by changing the pressure of this type of water level sensor, even if a person bathes in a bathtub while the pump is operating, the pressure by the pump driving is detected by the water level sensor. However, there is a problem that an accurate bathing determination cannot be made, but there is an entrance detection unit that detects that the bather has entered the bathroom and a circulation path that can circulate hot water in the bathtub. Is detected by detecting the water level based on the stop signal after stopping the pump for circulating through the circulation path (see Patent Document 1). .

JP2015-137818A

  However, since Patent Document 1 stops the pump unconditionally when a person enters the room regardless of the bath temperature in the bathtub, if the bath temperature has already dropped when the person entered the room, While washing the body and the like, the bath temperature dropped further, and there was a problem that when a person took a bath, the person gets an uncomfortable feeling by the warm bath.

  In order to solve the above problems, the present invention provides a reheating control for performing a reheating operation in which the temperature is raised to a reheating target temperature set in advance by a remote controller provided in the bathroom or outside the bathroom when the bath temperature of the bathtub is lowered to a predetermined temperature. Bath water heater provided with a means and a human sensor for detecting the presence or absence of a person in the bathroom, and an entrance determination means for determining whether a person has entered the room based on the detection result of the human sensor The temperature change means includes a temperature change means for changing the reheating target temperature according to the determination of the room entry determination means, and when the room entry determination means determines that a person has entered during the retreat operation, The reheating control means lowers the preset reheating target temperature, and the reheating control means continues the reheating operation when the bath temperature is lower than the reheating target temperature. If the bath temperature is higher than the target temperature was set to terminating the reheating operation.

  A water level sensor that detects a water level from a pressure change in the bathtub; and a bathing determination unit that determines whether or not a person has bathed based on the pressure change detected by the water level sensor. When bathing is determined, the reheating target temperature is returned to the preset reheating target temperature.

  According to the present invention, it is not possible to make a bathing determination because the bath circulation pump is driven by ending the chasing operation relatively quickly by reducing the chasing target temperature of the chasing operation by entering the room. The time can be shortened, the bath temperature can be prevented from excessively decreasing, and bathing can be determined without impairing comfort during bathing.

Schematic explanatory diagram of the first embodiment of the present invention The flowchart showing the switching operation of the reheating target temperature of this invention The flowchart showing the operation of the chasing operation of this invention Time chart showing the state of the person of the present invention, the chasing operation and the movement of the bath temperature

Next, a first embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water, 2 is a heat pump unit as a heating means for heating the hot water, and 3 is a bathtub.

  Reference numeral 4 denotes a heating circulation circuit that connects the hot water storage tank 1 and the heat pump unit 2 so that they can circulate, and has a heating circulation pump 5 connected to the lower part of the hot water storage tank 1 and the heat pump return connected to the upper part of the hot water storage tank 1. The hot water in the lower part of the hot water storage tank 1 is heated by the heat pump unit 2 through the heat pump outgoing pipe, and the heated hot water is returned to the upper part of the hot water storage tank 1 by the heat pump return pipe and is heated in the hot water storage tank 1 The hot water is stored. A hot water storage temperature sensor 6 is provided on the outer peripheral surface of the hot water storage tank 1, and the hot water storage temperature sensor 6 detects a hot water storage amount by detecting a predetermined temperature or higher.

  7 is a water supply pipe that supplies water to the hot water storage tank 1, 8 is a hot water discharge pipe that discharges hot water in the hot water storage tank 1, 9 is a water supply bypass pipe that branches off from the water supply pipe 7 and bypasses the hot water storage tank 1, and 10 is a water supply bypass A hot water supply mixing valve for mixing cold water from the pipe 9 and hot water from the hot water discharge pipe 8 so as to reach a set temperature, 11 is a hot water supply pipe for supplying hot water having a mixed set temperature, and 12 is provided at the end of the hot water supply pipe 11. It is a hot water tap. Reference numeral 13 denotes a hot water supply temperature sensor provided downstream of the hot water supply mixing valve 10, and reference numeral 14 denotes a hot water supply flow rate sensor for counting the amount of hot water supply. In addition, 15 is a pressure reducing valve for reducing the water pressure to a predetermined pressure, and 16 is a pressure relief valve for releasing overpressure caused by heating.

  Reference numeral 17 denotes a bath circulation circuit, which includes a bath heat exchanger 18 and a bathtub 3 for exchanging heat between the hot water in the hot water storage tank 1 and the hot water in the circulating bath, and a bath outlet pipe 17a from the bathtub 3 to the bath heat exchanger 18 and A bath return pipe 17b from the bath heat exchanger 18 toward the bathtub 3 is connected to be circulated.

  19 is a bath circulation pump provided in the bath circulation circuit 17, 20 is a running water sensor that detects the presence or absence of running water, 21 is a bath temperature sensor that detects the temperature of the bath flowing through the bath circulation circuit 16, and 22 is a bathtub based on the water pressure of hot water. 3 is a water level sensor that detects the water level in the bath 3 and is provided upstream of the bath circulation pump 19 in the middle of the bath circulation circuit 17.

  23 is a hot water supply pipe branched from the middle of the hot water supply pipe 11 and connected to the bath circulation circuit 17 for performing hot water filling to the bathtub 3, and 24 is provided in the hot water filling pipe 23 to start the hot water filling to the bathtub 3. A hot water filling valve 25 for stopping is a bath flow sensor for counting the amount of hot water filling to the bathtub 3. In addition, 26 is a two-way valve provided between the hot water filling pipe 23 and the water level sensor 22, and when the hot water is filled, the valve is temporarily opened to perform air purge of the piping from the hot water filling pipe 23 of the bath return pipe 17b to the bathtub 3. After that, the valve is closed so that the water level can be filled while the water level sensor 22 monitors the accurate water level.

  Reference numeral 27 denotes a heating control unit that controls the heating of the heat pump unit 2, and reference numeral 28 denotes a control device that controls hot water supply and a bath. The control device 28 includes a reheating operation control means 29 for controlling the operation during reheating operation, a reheating target temperature A which is a target temperature for reheating operation, and a renewal target temperature B which is lower than that. Temperature changing means 30 is provided which changes the conditions according to the conditions of the flowchart.

  31 is a remote controller in the bathroom that is communicable with the control device 28 and is provided in the bathroom, and an operation unit for setting a reheating target temperature A that is a target temperature for reheating operation and a bath setting hot water amount that is a target hot water amount. 32, a display unit 33 for displaying the setting content, and a human sensor 34 for detecting the presence or absence of a person in the bathroom.

  The human sensor 34 is a pyroelectric sensor that detects the temperature change amount of the heat source in the detection area, and detects that there is a person in the bathroom. Specifically, the human sensor 34 detects whether or not a person is present in the bathroom by detecting a temperature change in a detection area when the person moves or moves a limb or the like. Based on the detection result of the human sensor 34, the entrance determination unit 35 provided in the control device 28 determines whether to enter the bathroom or to leave the bathroom.

  Further, the control device 28 is provided with a bath determination means 36 for determining whether a person has bathed in the bathtub 3 or whether a person has bathed from the bathtub 3. Specifically, the bathing determination means 36 detects, with the water level sensor 22, a pressure change that occurs during bathing when the bath circulation pump 19 is stopped or when a person bathes in or out of the bathtub 3. Then, based on the detection result, a person's bathing or bathing is determined. Furthermore, when the bath circulation pump 19 is driven and it is difficult to detect the water level as in the reheating operation described later, it is determined whether a person is bathing or taking a bath from the difference in water level before the start of the reheating operation and after the completion of the reheating operation. ing.

  37 is a remote controller outside the bathroom that is communicable with the control device 28 and is provided in the bathroom. Like the remote controller 31 in the bathroom, the remote controller 37 has an operation unit 32 and a display unit 33. The remote control is not equipped.

Next, the boiling operation will be described.
When there is a boiling request, the control device 28 drives the heating circulation pump 5 in the middle of the pipe connecting the hot water storage tank 1 and the heat pump unit 2, draws water from the lower part of the hot water storage tank 1, and warms it with the heat pump unit 2. By continuing the operation of returning to the upper part of the hot water storage tank 1, the water in the hot water storage tank 1 gradually rises to high temperature water.

Next, the hot water supply operation will be described.
When the hot water tap 12 is opened, water is supplied from the water supply pipe 7 and flows into the lower part of the hot water storage tank 1, passes through the water supply bypass pipe 9, and the hot water pushed out from the upper part of the hot water storage tank 1 and the water supply of the water supply bypass pipe 9 Hot water that has been mixed at 10 and adjusted so that the set temperature of hot water supply and the temperature detected by the hot water supply thermistor 13 are the same is supplied from the hot water tap 12.

The hot water filling operation will be described.
When the hot water filling switch of the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom is pressed, the control device 28 opens the hot water filling valve 24, supplies water from the water supply pipe 7, flows into the lower part of the hot water storage tank 1, and the water supply bypass pipe The hot water pushed out from the upper part of the hot water storage tank 1 and the feed water of the feed water bypass pipe 9 are mixed by the hot water mixing valve 10 so that the bath set temperature and the temperature detected by the bath temperature sensor 21 are the same. The hot water filling is started by flowing the hot water into the bathtub 3. Then, the flow rate detected by the bath flow rate sensor 25 is detected, and when the total integrated value of the flow rate has flowed by the set amount of hot water filling, the control device 28 closes the hot water filling valve 24 to complete the hot water filling. .

  Then, after the hot water filling operation is completed, the time is counted, and the bath circulation pump 19 is driven every time a predetermined interval time elapses, and the bath temperature detected by the bath temperature sensor 21 is monitored. When the temperature becomes lower than the soaking start temperature, the hot water in the bathtub 3 and the bath heat exchanger 18 in the hot water storage tank 1 are circulated through the bath circulation circuit 17, and the bath temperature is preliminarily set in the bathroom remote control 31 and the bathroom remote control 37. The temperature is raised to the reheating target temperature A set in. This operation is performed every time a predetermined interval time elapses for a predetermined period (about 3 hours in this case) set in advance by the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom after completion of the hot water filling. Let's drive.

  The operation of the present embodiment is started by the operation of the reheating control means 29, the temperature changing means 30, the entrance determination means 35, and the bathing determination means 36 by starting the heat insulation operation after the hot water filling operation is completed. When the remote controller 31 in the bathroom or the remote controller 37 outside the bathroom provided outside the bathroom is turned off, or the warming operation for a predetermined period is completed, the reheating control means 29 and the temperature changing means 30 The operation of the present embodiment is stopped by the operations of the entrance determination means 35 and the bath determination means 36. Moreover, you may make it start or cancel | release arbitrarily the heat retention driving | operation by a chasing driving | operation by operation in the bathroom remote control 31 and the bathroom remote control 37.

Next, switching between the reheating target temperature A set in advance by the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom and the reheating target temperature B lower than the reheating target temperature A by a predetermined temperature (here, 2 ° C.) is shown in FIG. This will be described in detail based on this flowchart.
First, after the hot water filling operation is completed, the chasing control means 29 determines the chasing target temperature as the chasing target temperature A set in advance by the bathroom remote controller 31 and the bathroom remote controller 37 (S1). Then, when the human sensor 34 detects the movement of a person in the bathroom, and the entrance determination unit 35 determines that there is an entrance based on the detection result of the human sensor 34 (Yes in S2), the reheating control unit 29 Entry flag: F1 = 1 is stored (S3), and based on the stored information, the temperature changing means 30 has a temperature lower than the reheating target temperature A set in advance by the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom. The reheating target temperature is changed to the reheating target temperature B (S4).

  If the bathing determination unit 36 does not determine that the bathing is performed as it is, but the entrance determination unit 35 determines that the person has left the bathroom (Yes in S5), the retreat control unit 29 stores the entrance flag: F1 = 0. (S6) Based on the stored information, the temperature changing means 30 returns the target temperature B to the target temperature A (S7).

  In addition, when the entrance determination unit 35 does not determine that the user has left the room (S5 is No) and the bathing determination unit 36 determines that the bathing is performed (S8 is Yes), the retreat control unit 29 determines that the entrance flag: F1 = 1 and the bathing flag : F2 = 1 is stored (S9), and based on the stored information, the temperature changing means 30 returns the target temperature B to the target temperature A (S10).

  Thereafter, when the entrance determination means 35 determines that the person has left the bathroom (S11 is Yes), the retreat control means 29 stores the entrance flag: F1 = 0 and the bathing flag: F2 = 0 (S12), and goes to S1. Return. Then, the same operation is repeated. This repetitive operation continues for a predetermined period (three hours in this case) after the hot water filling is completed or until the remote control 31 in the bathroom and the remote control 37 outside the bathroom are turned off.

Next, the operation of the chasing operation will be described in detail based on the flowchart of FIG.
After completion of the hot water filling operation, the reheating control means 29 detects the current water level with the water level sensor 22 when a predetermined interval time has elapsed (S13 is Yes), and the reheating control means 29 stores the detection result. (S14), the bath circulation pump 19 is driven (S15). When the bath circulation pump 19 is driven, bath water in the bath is sent to the bath temperature sensor 21 to detect the bath temperature. When the detected bath temperature is lowered to the reheating start temperature (S16 is Yes), the reheating operation is started and the heat retaining operation is started (S17).

  At this time, the temperature changing means 30 confirms the information of the entrance flag F1 and the bathing flag F2 stored in the chase control means 29 based on the flowchart of FIG. 2, and the entrance flag: F1 = 1 and the bathing flag: F2 =. If it is 0 (Yes in S18), the reheating target temperature is set as the reheating target temperature B, the renewal operation is continued until the reheating target temperature B is reached, and the reheating target temperature B is reached (S19 is Yes). Then, the driving of the bath circulation pump 19 is stopped, the chasing operation is ended, and a predetermined interval time is reset. (S21).

  The information of the entrance flag F1 and the bathing flag F2 stored in the reheating control means 29 is continuously checked until the renewal operation is completed. However, if a person takes a shower and leaves the bathroom as it is, an entry flag: F1 = 0 and a bathing flag: F2 = 0, the temperature changing means 30 changes the temperature to the target temperature A. Continue chasing driving.

  In this way, the entrance flag: F1 = 1 and the bathing flag: F2 = 0, in other words, in the state of entering the room and in the state where bathing in the entrance state has not yet been performed, the reheating target temperature is lowered. The bath circulation pump 19 is driven so that the time during which bathing determination cannot be performed can be shortened, the bath temperature can be prevented from excessively decreasing, and the comfort of bathing is not impaired. Judgment can be made.

  When the state of the entrance flag F1 and the bathing flag F2 stored in the chasing control means 29 is other than the pausing flag: F1 = 1 and the bathing flag: F2 = 0 (No in S18), the chasing target The temperature is set as the reheating target temperature A, and the reheating operation is continued until the reheating target temperature A is reached. When the reheating target temperature A is reached (S20 is Yes), the driving of the bath circulation pump 19 is stopped and the reheating operation is performed. Is finished, and a predetermined interval time is reset. (S21).

  The information of the entrance flag F1 and the bathing flag F2 stored in the reheating control means 29 is continuously checked until the reheating operation is completed, and the reheating operation is being performed at the reheating target temperature A. However, if a person enters the bathroom and the entrance flag: F1 = 1 and the bathing flag: F2 = 0, the temperature changing means 30 changes to the target temperature B and continues the driving operation. And do it.

  Then, when the reheating control means 29 completes the reheating operation at the reheating target temperature that matches the state of the entrance flag F1 and the bathing flag F2, the bathing determination means 36 performs the water level and renewal operation after completion of the reheating operation. The water level immediately before the start is compared (S22), and it is determined whether a person has taken a bath during the chasing operation from the water level change (S23).

  In this way, even when bathing during the chasing operation to the chasing target temperature, since the chasing target temperature has been changed to a low temperature, the chasing operation is completed relatively quickly, The opportunity to determine whether or not there was a bath during the operation of the bath circulation pump 19 by comparing the water level after completion of the chasing operation and the water level before starting the chasing operation will come soon, and the actual bathing and bathing judgment The time lag can be shortened.

  When the bath temperature detected by the bath temperature sensor 21 has not decreased to the reheating start temperature (No in S16), the bath circulation pump 19 is stopped and the predetermined interval time is reset (S24). If the determination means 36 determines that a person has bathed based on the detection result of the water level sensor 22 (S23 is Yes), it checks whether or not the reheating target temperature has been reached and the target temperature A has not been reached (S26). If not (S26 is Yes), the reheating operation is started at the reheating target temperature A set in advance by the remote controller 31 in the bathroom and the remote control 37 outside the bathroom (S27). Yes), the bath circulation pump 19 is stopped, the chasing operation is ended, the count of a predetermined interval time is reset (S29), and the process returns to S13.Then, the same operation is repeated. This repetitive operation continues for a predetermined period (three hours in this case) after the hot water filling is completed or until the remote control 31 in the bathroom and the remote control 37 outside the bathroom are turned off.

  In this way, after the reheating operation at the reheating target temperature B, when the bathing determination is performed, the reheating target temperature is returned to A and the reheating operation is performed, so that the reheating operation performed when the bathing is determined is Since it is heated at a temperature higher than that at the start of bathing, the warming feeling of the bather can be improved and the comfort can be improved.

  Here, if you are immersed in a hot bath during the first bathing, there is a concern that blood pressure will rise rapidly and cause a heat shock, but in this example, the bath temperature from entering the room to bathing should be modest. Thus, by reducing the difference between the temperature in the bathroom and the bath temperature, it is possible to suppress blood pressure fluctuations during the first bathing accompanying bathing and to prevent heat shock. Furthermore, since the body is already used to hot water after the second bathing, the risk of heat shock is reduced, and the target temperature is set back to the original high temperature to improve comfort. ing.

  In addition, since the reheating target temperature is not changed when entry detection is not performed, the bathroom can be effectively warmed up and a heat shock accident accompanying bathing can be prevented.

Next, the state of the person, the chasing operation and the movement of the bath temperature will be described in detail based on the time chart of FIG.
The upper diagram of FIG. 4 is a time chart in the case where the person has actually taken a bath after reaching the retreat target B. When a person enters the bathroom during the chasing operation, the temperature changing means 30 changes the chasing target temperature A to the chasing target temperature B and performs the chasing operation. When the reheating target temperature B is reached, the bath circulation pump 19 is stopped and the reheating operation is terminated.

  At this time, since the chasing operation up to the chasing target temperature B is completed and the bath circulation pump 19 is stopped, the temperature is higher than the temperature at which a person feels lukewarm when taking a bath, thereby preventing discomfort. In addition, it is possible to prevent the water level sensor 22 from detecting the pressure due to the driving of the bath circulation pump 19 and the bathing determination means 36 from making an accurate bathing determination.

  When the bathing determination unit 36 determines that a person is bathing in the bathtub 3, the temperature changing unit 30 changes the reheating target temperature B to the reheating target temperature A, and the renewal control unit 29 performs the reheating operation. When the reheating target temperature A is reached, the bath circulation pump 19 is stopped and the reheating operation is terminated.

  As described above, after it is determined that the person has bathed after the chasing operation at the chasing target temperature B, the chasing target temperature is returned to A, and the chasing operation is performed when the bathing is determined. The whirling operation warms the bather at a temperature higher than that at the start of bathing, so that the warming feeling of the bather can be improved and the comfort can be improved.

  Further, the lower diagram of FIG. 4 is a time chart in the case where the person actually takes a bath before reaching the catching target B. When a person enters the bathroom during the chasing operation, the temperature changing means 30 changes the chasing target temperature A to the chasing target temperature B and performs the chasing operation. When the reheating target temperature B is reached, the bath circulation pump 19 is stopped and the reheating operation is terminated.

  However, when a person bathes during this chasing operation, the water level sensor 22 cannot accurately detect the pressure due to the driving of the bath circulation pump 19 because the chasing operation is being performed, but the chasing target temperature B is Since the temperature is lower than the reheating target temperature A, the renewal operation ends relatively quickly, and the water level sensor 22 immediately compares the water level difference between the water level after completion of the renewal operation and the water level before the start of the renewal operation. By doing so, bathing determination is possible, and the time lag from the actual bathing time point until the bathing determination of the bathing determination means 36 is completed can be shortened.

  When the bathing determination unit 36 determines that a person is bathing in the bathtub 3, the temperature changing unit 30 changes the reheating target temperature B to the reheating target temperature A, and the renewal control unit 29 performs the reheating operation. When the reheating target temperature A is reached, the bath circulation pump 19 is stopped and the reheating operation is terminated.

  As described above, after it is determined that the person has bathed after the chasing operation at the chasing target temperature B, the chasing target temperature is returned to A, and the chasing operation is performed when the bathing is detected. The whirling operation warms the bather at a temperature higher than that at the start of bathing, so that the warming feeling of the bather can be improved and the comfort can be improved.

  In addition, this invention is not limited to a present Example, It does not prevent changing in the range which does not change a summary, For example, although this time demonstrated using the heat pump type hot water storage hot water supply machine, the hot water storage tank 1 It may be a heater provided with a heater or a water heater that heats hot water with a heat source such as a burner.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 3 Bathtub 17 Bath circulation circuit 18 Bath heat exchanger 21 Bath temperature sensor 28 Controller 29 Reheating control means 30 Temperature change means 31 Bathroom remote control 34 Human sensor 35 Entrance determination means 36 Bathing determination means 36

Claims (2)

When the bath temperature of the bathtub is lowered to a predetermined temperature, a reheating control means for performing a reheating operation for raising the temperature to a reheating target temperature set in advance by a remote controller provided in the bathroom or outside the bathroom;
A human sensor for detecting the presence or absence of a person in the bathroom,
In a bath hot water supply device comprising an entrance determination means for determining whether a person has entered a room based on the detection result of the human sensor,
According to the determination by the entry determination means, the temperature change means for changing the reheating target temperature is provided.When the entry determination means determines that a person has entered during the retreat operation, the temperature changing means Lowering the preset reheating target temperature, the reheating control means continues the reheating operation when the bath temperature is lower than the reheating target temperature, and the bath temperature is higher than the reheating target temperature. In such a case, the bath water heater is configured to end the chasing operation. A water level sensor that detects a water level from a pressure change in the bathtub, and a bathing determination unit that determines whether or not a person has bathed based on the pressure change detected by the water level sensor, wherein the bathing determination unit is a human bathing The bath hot-water supply apparatus according to claim 1, wherein when the determination is made, the reheating target temperature is returned to the preset reheating target temperature.

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