JP4462381B1 - Hot water storage water heater - Google Patents

Abstract

An object of the present invention is to provide a hot water storage type hot water heater that suppresses unnecessary temperature drop of a bath and highly sets the temperature of hot water in a bathtub according to a person entering the room.
A hot water storage water heater of the present invention includes a hot water storage tank 3 for storing high temperature water, a bathtub 5, a bath temperature detecting means 67 for detecting the temperature of hot water in the bathtub 5, and a hot water in the hot water storage tank 3. And a reheating heat exchanger 6 for exchanging heat with the hot water in the bathtub 5 and a human body detecting means 93 for detecting a person in the bathroom. When the human body detecting means 93 detects a person, the hot water in the bathtub 5 is detected. When the hot water storage type hot water supply apparatus performs a reheating operation and detects a person, the heating capacity of the reheating heat exchanger 6 is increased according to the temperature detected by the bathtub temperature detecting means 67. change.
[Selection] Figure 1

Description

  The present invention relates to a hot water storage type hot water heater having a function of filling a bathtub with hot water.

  Conventionally, there are various types of water heaters of this type, such as those that instantaneously heat using the combustion heat of gas and oil, and those that have a hot water storage tank and heat with an electric heater or heat pump unit. In any of the types, many of them have an automatic hot water filling function that automatically pours a preset temperature and amount of hot water into a bathtub and then keeps the temperature of the bathtub constant (for example, Patent Document 1).

  FIG. 7 is a configuration diagram of a conventional hot water storage type water heater having a bath reheating function. In addition, although the heating means for boiling the hot water in the hot water storage tank is not shown in FIG. 7, a heater or a heat pump unit is used as the heating means.

  As shown in FIG. 7, a conventional hot water storage type hot water heater has a hot water storage tank 101 that stores high-temperature water, and is configured to send hot water in the hot water storage tank 101 to a bathtub 102. That is, an electromagnetic valve 103 is provided between the hot water storage tank 101 and the bathtub 102, and the hot water from the hot water storage tank 101 becomes hot water at an appropriate temperature by the mixing valve 104 by opening the electromagnetic valve 103 and is supplied to the bathtub 102.

  And when starting the filling operation, if the user starts the filling operation manually, or if the hot water filling operation is reserved and set in advance, the filling operation is automatically performed at the set time. Start. When the hot water filling operation is started, hot water of a set temperature is poured into the bathtub 102 by a set amount.

In addition, the hot water storage type water heater shown in FIG. 7 has a reheating heat exchanger 105 that enables a reheating operation by exchanging heat between the hot water in the hot water storage tank 101 and the hot water in the bathtub 102, and the hot water storage tank 101. A reheating pump 106 that repels the high-temperature water in the interior and transports it to the heat exchanger 105, and a bathtub 102
It has a bath pump 107 that replenishes hot water in the inside and conveys it to the heat exchanger 105. Moreover, the water level sensor 108 for detecting the water level in the bathtub 102, and the temperature sensor 109 for detecting the temperature of the hot water in the bathtub 102 are provided.

  At the time of reheating operation, the reheating pump 106 is driven to send high temperature water in the hot water storage tank 101 to the reheating heat exchanger 105, and the bath pump 107 is driven to regenerate hot water in the bathtub 102. The hot water after the heat exchange and the heat exchange is returned to the bathtub 102 again.

  In addition, the conventional hot water storage type hot water heater has a function of automatic chasing operation. FIG. 8 is a flowchart at the time of the conventional automatic chasing operation. As shown in FIG. 8, after the hot water filling operation is completed, the bath pump 107 is driven every predetermined time La (for example, every 15 minutes), and the temperature of the hot water in the bathtub 102 is detected by the temperature sensor 109.

  When the bath temperature detected by the temperature sensor 109 decreases to the reheating start temperature, the reheating pump 106 and the bath pump 107 are driven until the hot water in the bathtub 102 reaches the set temperature (reheating stop temperature). A reckless driving is performed automatically.

Moreover, the conventional hot water storage type water heater has an automatic hot water supply function. When the water level sensor 108 detects that the hot water level in the bathtub 102 is lower than the set water level by a predetermined level, the solenoid valve 103 is opened and hot water having a set temperature is poured up to the set water level. It's something that makes hot water.
JP 2008-82635 A

  However, in the conventional hot water storage type water heater, the bath pump 107 is driven every predetermined time La as shown in FIG. The temperature of hot water in 102 is detected. As a result, every time the bath pump 107 is driven, the cold hot water in the hot water supply pipe connecting the bathtub 102 and the reheating heat exchanger 105 enters the bathtub 102, and the bath temperature is unnecessarily high. Had the problem of lowering.

  And if the bath temperature does not drop to the boiling start temperature, the chasing operation will not be performed, so if the user takes a bath just before the chasing operation starts, it will feel very warm and uncomfortable Could give.

  The present invention solves the above-mentioned conventional problems, and suppresses unnecessary temperature drop of the bath, and has a high usability hot water storage type hot water heater that optimally sets the temperature of hot water in the bathtub according to a person entering the room. The purpose is to provide. It is another object of the present invention to provide a water heater that improves usability and reduces energy consumption.

In order to solve the above-described conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank for storing high-temperature water, a bathtub, a bathtub temperature detection means for detecting the temperature of the hot water in the bathtub, and the hot water storage tank. Reheating heat exchanger for exchanging heat between hot water in the bathtub and hot water in the bathtub, human body detecting means for detecting the presence of a person in the bathroom , and temperature setting means for setting the temperature of the hot water in the bathtub, In the reheating operation of hot water in the bathtub that is performed when the human body detecting means detects a person, the temperature of the hot water in the bathtub detected by the bathtub temperature detecting means is the temperature setting. When the predetermined temperature rises from the reheating start temperature lower than the temperature set by means, the reheating
By changing the heating capacity in the heat exchanger small , the hot water in the bathtub is set to a comfortable setting according to the person entering the room, so the timing of bathing can be matched with the timing of chasing operation. It does not give discomfort, reduces the timing to detect the bath temperature, suppresses unnecessary decrease in bath temperature, and can perform a very energy-saving reheating operation. The heating capacity of the reheating heat exchanger is changed accordingly, so that both comfort and energy saving can be achieved.

  INDUSTRIAL APPLICABILITY The present invention can provide a hot water storage type hot water heater that suppresses unnecessary temperature drop of a bath and that sets the temperature of hot water in a bathtub optimally according to a person entering the room.

A hot water storage type water heater according to a first aspect of the present invention includes a hot water storage tank for storing high temperature water, a bathtub, bath temperature detecting means for detecting the temperature of the hot water in the bathtub, hot water in the hot water storage tank, and the bathtub. A reheating heat exchanger for exchanging heat with hot water, human body detecting means for detecting the presence of a person in the bathroom , temperature setting means for setting the temperature of hot water in the bathtub, and a control device , In the reheating operation of hot water in the bathtub performed when the human body detecting means detects a person, the temperature of the hot water in the bathtub detected by the bathtub temperature detecting means is lower than the temperature set by the temperature setting means. When the predetermined temperature rises from the start temperature, the heating capacity in the reheating heat exchanger is changed to a small value, so that the hot water in the bathtub is set to a comfortable setting according to the person entering the room. Driving It can be combined with imming, does not give the bather an uncomfortable feeling, reduces the timing of detecting the bath temperature, and performs a very energy-saving reheating operation to suppress unnecessary decrease in the bath temperature Furthermore, since the heating capacity in the reheating heat exchanger is changed according to the temperature of the hot water in the bathtub, both comfort and energy saving can be achieved.

Moreover, if the temperature of the hot water in a bathtub is low when a person enters a bathroom, the temperature of the hot water in a bathtub can be raised in a short time, and energy-saving property can be improved more.

Also, if the temperature of the hot water in the bathtub is low when a person enters the bathroom, the temperature of the hot water in the bathtub can be raised in a short time, and if the temperature rises to some extent, the heating capacity is lowered to retreat Therefore, energy saving can be improved.

The hot water storage type water heater of the second invention is the first invention, in particular, when the human body detecting means does not detect a person, the temperature of the hot water in the bathtub is detected by the bathtub temperature detecting means every predetermined time, By performing the reheating operation when the temperature of the hot water in the bathtub is lower than the reheating start temperature, the heating capacity in the reheating heat exchanger is not changed according to the temperature detected by the bathtub temperature detecting means. In the reheating operation when no person is detected, the reheating operation is performed with a low heating capacity, so that the use of high-temperature water in the hot water storage tank can be reduced and the energy saving performance can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot-water storage type water heater with a bath reheating function according to the present embodiment. In FIG. 1, the hot water storage type water heater of the present embodiment includes a tank unit 1 and a heat pump unit 2, and heat pump unit 2 stores high-temperature water stored in a hot water storage tank 3 disposed in the tank unit 1. It is generated by. In the present embodiment, a heat pump is used as the heating means. However, the present invention is not limited to this. For example, there is no problem even if an electric heater is provided in the tank for heating. Moreover, the solid line arrow has shown the direction through which the fluid flows.

  Next, the configuration of the heat pump unit 2 will be described. The heat pump unit 2 is configured by sequentially connecting a water-refrigerant heat exchanger 24, a compressor 25, an evaporator 26, and an expansion valve 27 in an annular manner through a refrigerant pipe, and uses carbon dioxide as a refrigerant. Since the high pressure side exceeds the critical pressure, the water flowing through the water / refrigerant heat exchanger 24 is deprived of heat and does not condense even if the temperature is lowered. A difference is easily formed, high-temperature hot water can be obtained, and heat exchange efficiency can be increased.

  In addition, since carbon dioxide, which is relatively inexpensive and stable, is used as the refrigerant, the product cost can be reduced and the reliability can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  Further, in the heat pump unit 2, the refrigerant is compressed by the compressor 25, the refrigerant discharged from the compressor 25 radiates heat by the water refrigerant heat exchanger 24, is decompressed by the expansion valve 27, and then is discharged from the air by the evaporator 26. The heat is absorbed and sucked into the compressor 25 again in a gas state. The compressor capacity control and the expansion valve 27 opening control are performed so that the temperature of the discharged refrigerant detected by a thermistor (not shown) provided on the discharge side of the compressor 25 is maintained at a preset temperature. Controlled. The hot water in the hot water storage tank 3 flows into the water / refrigerant heat exchanger 24 by the operation of the water pump 28, exchanges heat with the refrigerant, returns to the hot water storage tank 3 again, and in the stacked state, Hot water is stored at the top.

  Next, the configuration of the tank unit 1 will be described. As described above, the tank unit 1 has the hot water storage tank 3, and a water supply pipe 31 for supplying low temperature water from a water supply source is connected to the bottom of the hot water storage tank 3, so that the water supply pressure is constantly in the tank. It is in a hanging state. In addition, a hot water discharge pipe 32 for discharging hot water in the hot water storage tank 3 is connected to an upper portion of the hot water storage tank 3 so that high temperature water can be supplied to a hot water supply terminal and a bathtub.

  Next, a hot water supply circuit for supplying hot water to the hot water supply terminal will be described.

  The hot water supply circuit in the present embodiment is configured such that hot water having a desired temperature can be generated by connecting the terminal water supply pipe 33 branched from the water supply pipe 31 and the hot water discharge pipe 32 with the electric mixing valve 4. The mixing ratio of the electric mixing valve 4 is changed so that the temperature detected by the temperature sensor 41 provided on the downstream side of the electric mixing valve 4 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Is done. Then, the hot water mixed at a desired temperature is supplied to the hot water supply terminal 42.

  Next, a hot water filling circuit and a reheating circuit for the bathtub 5 will be described.

  In the present embodiment, the hot water in the bathtub 5 and the high-temperature water in the hot water storage tank 3 exchange heat with the heat exchanger 6 and have a reheating function for reheating the hot water in the bathtub. . Therefore, the high temperature side circuit of the reheating heat exchanger 6 is configured to be supplied with the high temperature water in the hot water storage tank 3, and is configured to return the hot water after heat exchange to the lower part of the hot water storage tank 3. Has been. Moreover, the low temperature side circuit of the reheating heat exchanger 6 is configured to be supplied with hot water in the bathtub 5, and is configured to return the bathtub water after the heat exchange to the bathtub 5 again. .

  In the high temperature side circuit, a temperature sensor 71 as a high temperature side outlet temperature detecting means is disposed downstream of the reheating pump 7 and the reheating heat exchanger 6, and the reheating pump 7 is driven to drive the hot water storage tank. The hot water in 3 is conveyed to the reheating heat exchanger 6.

  And the adapter 51 of the bathtub 5 and the tank unit 1 are connected by the return connection pipe 61 and the forward connection pipe 62 in the connection parts 60a-60d. The return connection pipe 61 and the forward connection pipe 62 are connected to the reheating heat exchanger 6 by a return pipe 63 and a forward pipe 64, respectively. The bathtub 5, the return connection pipe 61, the return pipe 63, The reheating heat exchanger 6, the outgoing pipe 64, and the outgoing connecting pipe 62 are sequentially connected to constitute a reheating circuit.

  The hot water filling circuit for supplying hot water from the hot water storage tank 3 to the bathtub 5 includes a bath hot water supply pipe 34 branched from the hot water supply pipe 32 and a bath water supply pipe 35 branched from the water supply pipe 31 to the electric mixing valve 8. And hot water having a desired temperature can be generated. The mixing ratio of the electric mixing valve 8 is changed so that the temperature detected by the temperature sensor 81 provided on the downstream side of the electric mixing valve 8 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Is done. Then, the hot water mixed at a desired temperature is supplied to the bathtub 5.

  Moreover, the flow rate sensor 82 is provided in the hot water filling circuit, and the amount of hot water supplied to the bathtub 5 is measured. Further, a two-way electromagnetic valve 83 is provided, and at the start of hot water filling, the supply of hot water to the bathtub 5 is started simultaneously with opening of the electromagnetic valve 83. After the electromagnetic valve 83 is opened, hot water filling is performed from two directions of the return pipe 63 and the forward pipe 64 to the bathtub 5. In addition, a check means 84 is provided for preventing the backflow of sewage.

  The return pipe 63 includes a bath pump 65 that is a conveying means for circulating hot water in the bathtub 5, a water level sensor 66 that detects the water level in the bathtub 5, and a bath temperature that detects the temperature of hot water in the bathtub 5. A temperature sensor 67 as a detection means is provided, and when the bath pump 65 is driven, hot water in the bathtub 5 is sucked into the return pipe 63 and flows into the forward pipe 64 via the reheating heat exchanger 6. It is returned to the bathtub 5 again. In addition, a flow switch 68 is provided between the bath pump 65 and the reheating heat exchanger 6 so that the flow of water can be detected when turned on.

  In addition, a remote control device 9 is installed in the bathroom, which is an operation means that can operate the hot water storage type hot water heater, and is a temperature setting means for setting the temperature of hot water in the bathtub 5, and the remote control device 9 is operated. Then, set the temperature of the hot water, fill the bath, and perform the trial run after installation. The remote control device 9 has a display unit 91 for displaying information and an operation unit 92 for performing operations.

  Further, the hot water storage type water heater of the present embodiment also has a control device 94 that receives an instruction from the remote control device 9 and commands each control device. The control device 94 is composed of a microcomputer and its electronic control parts, and sends commands to the devices (such as the bath pump 65 and the reheating pump 7) that constitute the tank unit 1.

  Furthermore, the remote control device 9 of the present invention is provided with a human body detection means 93 so that it can detect that a person has entered the bathroom. The human body detecting means 93 can be various sensors such as an infrared sensor, an illuminance sensor that detects the illuminance in the bathroom, and an impact (vibration) sensor that detects the vibration of the occupant and the opening and closing of the door. Is not specified.

  For example, in the case of an infrared sensor, it is recognized that a person has been detected if there is a temperature change from the surrounding temperature situation, and in the case of an illuminance sensor, if the illuminance of bathroom lighting is detected, the person In the case of an impact sensor, if an output from the impact sensor is detected for a predetermined time, it is determined that there is a person entering the room. It is also possible to combine a plurality of these sensors.

  Further, in the case of the present embodiment, the human body detecting means 93 is provided in the remote control device 9, but the present invention is not limited to this. For example, in the case of an impact sensor, a dressing room adjacent to the bathroom. When it is installed behind the floor or installed on the door surface of the bathroom to detect vibrations, and when the bathroom lighting switch is used as a human body detection means, the bathroom lighting switch is turned on. It is good also as what detects a human body when it makes it.

  Further, in the present embodiment, the control device 94 has a heating capability setting means for changing the heating capability of hot water in the bathtub 5 by the reheating heat exchanger 6, and the heat retention temperature set by the remote control device 9 is changed. The heating capacity is set by the heating capacity setting means in accordance with the temperature of the hot water in the bathtub 5. In the present embodiment, three types of “large”, “medium”, and “small” are set as the heating capacity in the reheating heat exchanger 6 when the function of the human body detecting means 93 is on.

  When the heating capacity in the reheating heat exchanger 6 is set to “high”, the temperature detected by the temperature sensor 71 becomes the hot water temperature in the bathtub 5 detected by the temperature sensor 67 + 10 ° C. Thus, when the reheating pump 7 is driven and the heating capacity is set to “medium”, the temperature detected by the temperature sensor 71 is the hot water temperature in the bathtub 5 detected by the temperature sensor 67 +6. When the reheating pump 7 is driven so that the temperature becomes 0 ° C., and the heating capacity is set to “small”, the temperature detected by the temperature sensor 71 is the temperature in the bathtub 5 detected by the temperature sensor 67. The reheating pump 7 is driven so that the hot water temperature becomes + 3 ° C.

  The setting of the heating capacity is not limited to three types of “large”, “medium”, and “small” as in the present embodiment, and the three types may be further subdivided, or “large” “ “Small” may be used. Further, a relational expression between the heating capacity and the hot water temperature in the bathtub 5 may be provided, and the heating capacity may be changed and determined steplessly according to the relational expression.

  In the hot water storage type water heater configured as described above, first, the hot water filling operation of the hot water storage type water heater will be described.

  When the user operates the remote control device 9 to start the hot water filling operation, or when the hot water filling operation is reserved in advance, the hot water filling operation is started at the set time. When the hot water filling operation is started, the electromagnetic valve 83 is opened, and high temperature water from the hot water storage tank 3 is mixed by the electric mixing valve 8 so as to reach a set temperature, and supplied to the bathtub 5.

  Hot water discharged from the electric mixing valve 8 is branched in two directions, a return pipe 63 and an outgoing pipe 64, and hot water is supplied to the bathtub 5. Further, the amount of hot water filling is detected by the flow rate sensor 82, and when the set amount of hot water is detected by the flow rate sensor 82, the electromagnetic valve 83 is closed and the hot water filling operation is terminated.

  Note that the temperature of the hot water mixed by the electric mixing valve 8 during the hot water filling operation may be several degrees higher than the temperature of the hot water set by the remote control device 9. This is because the hot water mixed by the electric mixing valve 8 dissipates heat when flowing through the hot water supply pipe until it goes to the bathtub 5, and when the hot water is poured into the bathtub 5, the temperature may decrease. It is. For this reason, by setting the temperature of the hot water mixed by the electric mixing valve 8 to be higher than the set temperature, it is possible to perform a hot water filling operation in consideration of heat radiation in the piping.

  Next, the remote control device 9 of the hot water storage type hot water heater of the present invention is provided with the human body detecting means 93, and after the hot water filling operation is completed, when the automatic chasing operation using the human body detecting means 93 is performed, There are cases in which the function of the detecting means 93 is turned off to perform an automatic chasing operation. First, the automatic chasing operation in which the function of the human body detecting means 93 is turned off will be described.

  In the present embodiment, when the function of the human body detecting means 93 is turned off, the automatic chasing operation is performed after the hot water filling operation. In the automatic reheating operation, the bath pump 65 is driven and the hot water in the bathtub 5 is circulated through the return pipe 63 and the forward pipe 64 every time the first predetermined time (ΔL1) has elapsed since the end of the hot water filling operation. Thus, the temperature sensor 67 detects the temperature of the hot water in the bathtub 5. For example, if the first predetermined time (ΔL1) is set to 15 minutes, the bath pump 65 is driven every 15 minutes after the hot water filling operation is completed to detect the temperature.

  Then, as a result of detecting the temperature of the hot water in the bathtub 5 by driving the bath pump 65 for a predetermined time α (for example, 45 seconds) every first predetermined time, the temperature of the hot water in the bathtub 5 is a predetermined temperature. When it is detected that the temperature is equal to or lower than Ts (reheating start temperature), the reheating operation is started, the reheating pump 7 and the bath pump 65 are driven, and the reheating heat exchanger 6 causes the high temperature in the hot water storage tank 3 to rise. The water and hot water in the bathtub 5 exchange heat, and replenish the hot water in the bathtub 5. Then, when the temperature of the hot water in the bathtub 5 reaches the set temperature (reheating stop temperature), the reheating operation is stopped and the reheating operation is completed.

  FIG. 2 is a flowchart of the reheating operation at the normal time. As shown in FIG. 2, after the chasing operation is finished, the bath pump 65 is first driven at the time Lma when the first predetermined time (ΔL1) has elapsed, and the temperature of the hot water in the bathtub 5 is detected. In the case of FIG. 2, since the temperature of the hot water in the bathtub 5 has not yet fall below the predetermined temperature Ts at the time Lma, the bath pump 65 is driven again at the time Lmb when the first predetermined time (ΔL1) has passed. The temperature of hot water in the bathtub 5 is detected. As a result, since it is below the predetermined temperature Ts at time Lmb, the driving of the reheating pump 7 is started, and the reheating pump 7 and the bath pump 65 are driven to start the reheating operation of the hot water in the bathtub 5.

  Then, when the temperature of the hot water in the bathtub 5 reaches a predetermined temperature Tw (reheating end temperature), the reheating operation is ended. In the case of FIG. 2, the chasing operation is performed until the time Lmc, and after the chasing operation, the temperature of the hot water in the bathtub 5 is detected every first predetermined time from the time Lmc. . At this time, the predetermined temperature Tw set as the reheating end temperature is set to a temperature slightly higher than the heat retention temperature T1 set by the remote control device 9, and in this embodiment, the predetermined temperature Tw = the heat retention temperature T1 + 0. It has a relationship of 5 ° C.

  In the automatic chasing operation in which the function of the human body detecting means 93 is turned off, the temperature is decreased every first predetermined time (time Lma, time Lmb, time Lmd, time Lme) as shown in FIG. This is because the hot water in the return connection pipe 61, the forward connection pipe 62, the return pipe 63, and the forward pipe 64 is supplied to the bathtub 5 by driving the bath pump 65. Therefore, in addition to simple heat radiation from the bathtub 5, by driving the bath pump 65 to detect the temperature of the hot water in the bathtub 5, the cold water is supplied into the bathtub 5 and the temperature of the hot water in the bathtub 5 is detected. Is reduced.

  Next, the automatic chasing operation function when the function of the human body detection means 93 is turned on will be described. The function of the human body detecting means 93 can be switched on and off by performing a predetermined operation with the remote control device 9.

  FIG. 3 is a flowchart of the chasing operation in the absence when the function of the human body detecting means 93 is turned on. As shown in FIG. 3, even when the function of the human body detection means 93 is turned on, the bath temperature is detected every second predetermined time after the hot water filling operation is completed. If the bath temperature is not detected regularly, the temperature drop of the hot water in the bathtub 5 progresses with time, and the hot water in the bathtub 5 is set even though the user has set the automatic reheating operation. This is because it may cool down and become water.

  In the present invention, the bath temperature is detected by driving the bath pump 65 for a predetermined time α (for example, 45 seconds) every second predetermined time (ΔL2). However, the second predetermined time (ΔL2) is set to be longer than the first predetermined time (ΔL1) at the timing of driving the bath pump 65 in the chasing operation when the function of the human body detecting means 93 is turned off. is doing. In order to compare the first predetermined time and the second predetermined time, FIG. 3 also shows the flow of the automatic chasing operation when the function of the human body detecting means 93 is turned off by a two-dot chain line. .

  For example, by setting 15 minutes for the first predetermined time (ΔL1) and setting 30 minutes for the second predetermined time (ΔL2), the bath pump when the function of the human body detecting means 93 is off is set. Since the number of times the bath pump 65 is driven when the function of the human body detecting means 93 is turned on can be reduced from the number of times the 65 is driven, the number of times cold water remaining in the pipe is put into the bathtub 5 can be reduced. Can do. The time set for the first predetermined time (ΔL1) and the second predetermined time (ΔL2) is not limited to 60 minutes and 15 minutes shown in the present embodiment.

  Even when the function of the human body detecting means 93 is turned on, the bath temperature is detected to be equal to or lower than the predetermined temperature Ts (reheating start temperature) as a result of detecting the bath temperature every second predetermined time (ΔL2). When this happens, the bath pump 65 and the reheating pump 7 are driven so that the heating capacity is set to “small” until the predetermined temperature Tw (reheating end temperature) and the hot water in the bathtub 5 is reheated. And

  The flow of the chasing operation in the absence when the function of the human body detecting means 93 is turned on will be described with reference to FIG. After the chasing operation, the bath pump 65 is driven every second predetermined time (ΔL2) to detect the temperature in the bathtub 5. In FIG. 3, after completion of the hot water filling operation, the bath pump 65 is driven at the time Lua when the second predetermined time (ΔL2) has elapsed, and the temperature of the hot water in the bathtub 5 is detected, and the predetermined temperature Tw (end of reheating) is reached. (Temperature).

  In the present embodiment, the bath pump 65 is driven every second predetermined time (ΔL2) when the function of the human body detecting means 93 is on, and the person is absent. The temperature of the hot water is detected and the reheating operation is performed when the temperature is lower than the predetermined temperature Ts. At this time, the reheating pump is always used regardless of the temperature of the hot water in the bathtub 5. 7 may be driven so that the temperature of the hot and cold water in the bathtub 5 is changed to a predetermined temperature Tw (reheating end temperature). This is because the temperature of the hot water in the bathtub 5 is expected to decrease to some extent due to heat dissipation, although the number of times of driving the bath pump 65 is smaller than when the function of the human body detection means 93 is off.

  In the present embodiment, the bath pump 65 is driven every second predetermined time (ΔL2) to detect the temperature in the bathtub 5, but the second predetermined time (ΔL2) is constant. In addition to setting time, it may be set by learning control or the like.

  As described above, when there is no person in the bathroom, the number of times that the bath pump 65 is driven is smaller than when the function of the human body detection means 93 is turned off. The number of times that the temperature of the hot water in the bathtub 5 is lowered by being supplied to the bathtub 5 is reduced, and the number of chasing operations is also reduced, so that the hot water in the hot water storage tank 3 is not wasted.

In addition, if there is no person in the bathroom, the hot water in the bathtub 5 is not immediately increased to the end temperature Tw, and it does not impair the comfort of the bather, but quickly increases to the end temperature Tw. Therefore, even if the temperature of the hot water in the bathtub 5 is any number of times, the heating capacity is not changed, and in this embodiment, the heating capacity is set to “low” with the lowest heating capacity. The hot water in the hot water storage tank 3 is returned to the bottom of the hot water storage tank 3 after being lowered to a low temperature by the reheating heat exchanger 6, so that when the heat pump is used as the heating means, the boiling efficiency is very high. Can be improved.

  Next, the chasing operation when the bather enters the bathroom will be described.

  When the human body detecting means 93 detects that the bather has entered the bathroom, the bath pump 65 is first driven for a predetermined time β (for example, 2 seconds), and then the reheating pump 7 is immediately driven to retreat. Do the driving. At this time, the predetermined time β has a relationship of the above-mentioned predetermined time α and the predetermined time α> predetermined time β. The bath switch 65 is moved by the predetermined time β in the bathtub 5 by the flow switch 68. This is to determine whether there is hot water. The difference from the case where the function of the human body detecting means 93 is turned off is that the timing of starting the chasing is different.

  In the chasing operation when the function of the human body detection means 93 is turned off, the bath pump 65 is moved by a predetermined time α every first predetermined time (ΔL1), and the temperature of hot water in the bathtub 5 is first detected. . Then, it is determined whether or not the detected temperature of the hot water in the bathtub 5 is lower than the predetermined temperature Ts. When the detected temperature is lower than the predetermined temperature Ts, the reheating pump 7 is driven to start the reheating operation.

  In the present embodiment, the predetermined time α is set to 45 seconds, and the bath pump 65 is driven during the predetermined time α. This is because the cold water in the pipe and the hot water in the bathtub 5 are mixed and the hot water in the pipe and the bathtub 5 is circulated until the temperature in the bathtub 5 is stabilized. Judging whether to start.

  On the other hand, when the function of the human body detecting means 93 is turned on and the human body detecting means 93 detects entry into the bathroom, the bath pump 65 is moved by β for a predetermined time, so that there is first hot water in the bathtub 5. Whether it is detected by the flow switch 68. Then, before detecting the temperature of the hot water in the bathtub 5, the reheating pump 7 is driven to start the reheating operation. This detects the entry into the bathroom, and it is expected that the occupant will enter the bathtub 5 soon. Therefore, as long as it can be confirmed that there is hot water in the bathtub 5, the reheating pump 7 is immediately driven to follow. This is because it is necessary to start hot water and chase the hot water in the bathtub 5 as soon as possible.

  In the present embodiment, the predetermined time β is set to 2 seconds, and the bath pump 65 is driven for the predetermined time β. The reason why the predetermined time β is made shorter than the predetermined time α is that it is sufficient that the flow switch 68 can confirm that there is water. In this case, the temperature in the bathtub 5 is determined while driving the reheating pump 7, but the temperature of the hot water in the bathtub 5 can be increased more quickly. As described above, the relationship of the predetermined time α> the predetermined time β is established.

  FIG. 4 is a flowchart of the chasing operation when the function of the human body detecting means 93 is turned on. It should be noted that the automatic operation when the function of the human body detecting means 93 is on and no person is present in the bathroom so that it can be compared with the flowchart of the chasing operation in the absence when the function of the human body detecting means 93 is on. The chart of the chasing operation is shown by a one-dot chain line.

  As shown in FIG. 4, when the bathroom is entered at time Lna before the second predetermined time (ΔL2) elapses, the bath pump 65 is first moved by β for a predetermined time at time Lna. Thereafter, the reheating pump 7 is driven to start the reheating operation. Here, whether or not there is hot water in the bathtub 5 is confirmed by the flow switch 68 during the predetermined time β. Then, the driving operation is performed from time Lna to time Lnb.

Thereafter, the bath pump 65 is driven every third predetermined time (ΔL3) from the time Lnb to detect the temperature of the hot water in the bathtub 5. During bathing, the bath pump 65 is driven every third predetermined time (ΔL3) to detect the temperature of the hot water in the bathtub 5 and when the temperature falls below the predetermined temperature Ts (starting temperature), the bath pump 65 is driven. I'm trying to resume whispering. This is a chasing drive that does not impair the comfort of the bather. Therefore, the third predetermined time (ΔL3) is shorter than the second predetermined time (ΔL2).

  In FIG. 4, after the hot water in the bathtub 5 is chased up to the predetermined temperature Tw (reheating end temperature) at the time Lnb, the bath pump is used at the time Lnc when the third predetermined time (ΔL3) elapses from the time Lnb. 65 is driven for a predetermined time to detect the temperature of the hot water in the bathtub 5. As a result, if the temperature is lower than the predetermined temperature Ts, the chasing operation is started, and if not, the chasing operation is not started. In FIG. 4, since the temperature is not lower than the predetermined temperature Ts, the chasing operation is not performed.

  Then, the bath pump 65 is again driven for a predetermined time α at a time Lnd at which a third predetermined time (ΔL3) elapses from the time Lnc, and the temperature of the hot water in the bathtub 5 is detected. In the case of FIG. 4, as a result of detecting the temperature of the hot water in the bathtub 5 at the time Lnd, the temperature is lower than the predetermined temperature Ts, so the reheating pump 7 is driven and the temperature of the hot water in the bathtub 5 is increased. The chasing operation is performed until the predetermined temperature Tw is reached.

  The human body detection means 93 detects the movement of the person and determines that there is a person in the bathroom. Therefore, when the time when the human body detection means 93 does not detect a person passes a predetermined time γ (for example, 5 minutes), the absence of the person is determined and it is determined that there is no person in the bathroom. When the absence of the person is confirmed, the operation returns to the chasing operation in the absence when the function of the human body detecting means 93 shown in FIG. 3 is turned on.

  Next, a chasing operation from time Lna to time Lnb will be described. FIG. 5 shows an enlarged view of a portion K surrounded by a dotted line in FIG.

  In FIG. 5, when a human body is detected by the human body detection means 93 at time Lna, the bath pump 65 is driven for a predetermined time β to confirm the presence of hot water in the bathtub 5. If the presence of hot water in the bathtub 5 can be confirmed during the predetermined time β, the reheating pump 7 is driven to start reheating hot water in the bathtub 5.

  In the present embodiment, in addition to the normal reheating start temperature Ts and reheating end temperature Tw, the heat retention temperature T1 set by the remote controller 9 and the intermediate temperature T2 between the heat retention temperature T1 and the reheating start temperature Ts are set. Provided.

  When the human body is detected and the reheating operation is started, the heating capacity of the reheating heat exchanger 6 is forcibly set for a certain time (for example, 30 seconds) until the temperature in the bathtub 5 is determined. Carry out driving to become “large”.

  If the temperature Ti of the hot water in the bathtub 5 detected by the temperature sensor 67 is between Ts and T2 (when Ts <Ti <T2) as a result of detecting the temperature in the bathtub 5, a reheating heat is generated. The reheating operation is started so that the heating capacity in the exchanger 6 becomes “high”. In FIG. 5, from the time Lna to the time Lna1, the heating capacity is set to “high” and the reheating operation is performed.

  Then, when the temperature Ti of the hot water in the bathtub 5 detected by the temperature sensor 67 exceeds the intermediate temperature T2, the reheating operation is performed up to the heat retention temperature T1 so that the heating capacity becomes “medium”. Therefore, the heat exchange efficiency in the reheating heat exchanger 6 can be increased, and the high-temperature water in the hot water storage tank 3 can be efficiently used for reheating operation. In FIG. 5, from the time Lna1 to the time Lna2, the heating capability is set to “medium” and the reheating operation is performed.

  Furthermore, when the temperature Ti of the hot water in the bathtub 5 detected by the temperature sensor 67 exceeds the heat retention temperature T1, the reheating operation is performed up to a predetermined temperature Tw (reheating end temperature) so that the heating capacity becomes “small”. . As a result, the high-temperature water in the hot water storage tank 3 can be efficiently used for the reheating operation, and the temperature of the hot water returned to the hot water storage tank 3 can be lowered, thereby improving the boiling efficiency of the heat pump. be able to. In FIG. 5, from the time Lna2 to the time Lnb, the heating capacity is set to “small” and the reheating operation is performed.

  As described above, when the operation is performed with the heating capacity set to “large”, the medium temperature water is returned to the bottom of the hot water storage tank 3, but a short time until the person is immersed in the bathtub 5 is effectively utilized. It can quickly catch up to a certain temperature. Therefore, the comfort can be greatly improved.

  And if it raises to a comfortable temperature to some extent, the temperature of the hot water returned to the bottom part of the hot water storage tank 3 can be set low by setting the heating capacity to “medium” and “small”. In particular, when a heat pump is used as the heating means, hot water is sent to the heat pump from the bottom of the hot water storage tank 3, so the lower the temperature of the hot water at the bottom of the hot water storage tank 3, the better, as in this embodiment. By changing the heating capacity, the temperature of the hot water returned to the hot water storage tank 3 can be lowered and the boiling efficiency can be increased, so that a hot water storage type hot water heater having a very high boiling efficiency can be realized.

  Further, in the present embodiment, during the fourth predetermined time (ΔL4) after the chasing operation by the human body detecting means 93, the chasing operation is performed even if the human body detecting means 93 detects the human body again. Not going to be. It is determined that the temperature has not decreased so much during the fourth predetermined time (ΔL4) after the chasing operation is performed, and the chasing operation is performed every time the human body detecting means 93 detects the human body. This is because the high-temperature water in the hot water storage tank 3 may be wasted.

  FIG. 6 is a flowchart of the chasing operation for explaining the fourth predetermined time. In FIG. 6, the chasing operation by the human body detection means 93 is completed at time Lnb, and then the heat is dissipated with the passage of time and the temperature of the hot water in the bathtub 5 is decreased.

  It is assumed that the human body detecting unit 93 detects the human body again at a time Lnb1 from the completion of the chasing operation by the human body detecting unit 93 to the elapse of the fourth predetermined time (ΔL4). In the chasing operation by the normal human body detection means 93, the chasing operation is started immediately, but since it is within the fourth predetermined time, the chasing operation is not started.

  On the other hand, it is assumed that the human body is detected again by the human body detection means 93 at time Lnb2 after the fourth predetermined time has elapsed. As a result, even if a human body is detected, the chasing operation is started immediately.

  In this way, it is determined that the temperature of the hot water in the bathtub 5 has not decreased so much until the fourth predetermined time has elapsed after the human body detection and the chasing operation, and within the fourth predetermined time. Has been stopped. Further, after the fourth predetermined time has elapsed, it is determined that the temperature of the hot water in the bathtub 5 has decreased, and if there is a human body detection, the chasing is started and the bather's feeling of bathing is not impaired. I am doing so.

  As described above, by providing the fourth predetermined time, unnecessary chasing operation can be stopped, so that high-temperature water in the hot water storage tank 3 is not wasted and the energy saving performance is greatly improved. Can be made.

  Further, since it is possible to detect the human body by the human body detection means 93, it is not only associated with the bathing operation, but may be linked with the on / off of the display unit 91 of the remote control device 9. In particular, the frequency of entry into the bathroom and the time of day, depending on the individual lifestyle, are often concentrated in a limited time of 24 hours a day (from evening to night). In this case, even if the remote control device 9 in the bathroom is forgotten to be turned off, if the absence of a person can be confirmed by the human body detection means 93, the display unit 91 is turned off, thereby further reducing power consumption.

  Moreover, in this Embodiment, the heat pump unit is used as a heating means. As described above, this can be efficiently boiled, but on the other hand, when medium-temperature water or the like is boiled, the efficiency is lowered. However, reducing the number of detections of the bath temperature as in the present invention results in a reduction in the reheating operation time, resulting in a reduction in the amount of medium temperature water generated during the reheating operation. Therefore, the amount of medium-temperature water stored at the bottom of the hot water storage tank 3 is reduced, and the boiling efficiency in the heat pump unit can be increased.

  In addition, by changing the heating capacity during the reheating operation, the amount of medium-temperature water can be reduced, and the boiling efficiency can be improved.

  The hot water storage type hot water heater according to the present invention includes an integrated heat pump type hot water heater in which a heat pump cycle and a hot water supply cycle are integrated, a separate heat pump type hot water heater configured separately, and hot water heated by a heat exchanger for hot water supply. It can be applied to various heat pump water heaters such as a direct hot water heat pump type hot water heater that can discharge hot water as it is.

The block diagram of the hot water storage type water heater in embodiment of this invention Flowing operation flowchart when the human body detection function is off in the same form Flowing operation flowchart when the human body detection function is on in the same form Flowing operation flowchart when the human body detection function is on in the same form Flowing operation flowchart when the human body detection function is on in the same form Flowing operation flowchart when the human body detection function is on in the same form Configuration diagram of a conventional hot water storage water heater Conventional reheating operation flowchart

DESCRIPTION OF SYMBOLS 1 Tank unit 2 Heat pump unit 3 Hot water storage tank 5 Bathtub 6 Reheating heat exchanger 7 Reheating pump 9 Remote control device 28 Water pump 60a-60d Connection part 61 Return connection pipe 62 Outward connection pipe 63 Return pipe 64 Outward pipe 65 Bath pump 93 Human body detection means

Claims (2)

Hot water storage tank for storing hot water, bathtub, bathtub temperature detecting means for detecting the temperature of hot water in the bathtub, reheating heat exchange in which the hot water in the hot water tank and hot water in the bathtub exchange heat And a human body detecting means for detecting the presence of a person in the bathroom , a temperature setting means for setting the temperature of the hot water in the bathtub, and a control device, which are performed when the human body detecting means detects a person. In the reheating operation of the hot water in the bathtub, when the temperature of the hot water in the bathtub detected by the bathtub temperature detecting means rises by a predetermined temperature from the reheating start temperature lower than the temperature set by the temperature setting means, A hot water storage type water heater characterized by changing the heating capacity of the reheating heat exchanger small . When the human body detecting means does not detect a person, the bath temperature detecting means detects the temperature of the hot water in the bathtub every predetermined time, and when the temperature of the hot water in the bathtub is lower than the reheating start temperature, it is followed up. The hot water storage type hot water supply apparatus according to claim 1, wherein the heating capacity in the reheating heat exchanger is not changed in accordance with the temperature detected by the bathtub temperature detecting means while performing the burning operation.