JP7052468B2 - Heating heat source device - Google Patents

Description

The present invention relates to a heating heat source device, and more specifically to a heating heat source device having a heating function and a reheating function.

As one aspect of the heat source device, Japanese Patent Application Laid-Open No. 2016-6358 (Patent Document 1) discloses a hot water supply device having a reheating function for heating hot water in a bathtub. In Patent Document 1, when bathing from the bathtub of the user is detected, a bath heat recovery operation for lowering the temperature of the hot water for the bathtub is executed, and after the execution of the bath heat recovery operation is started, the bathtub is moved into the bathtub of the user. When bathing is detected, a reheating operation is performed in which the temperature of the hot water for bathtub is raised to the target temperature. By reducing the temperature difference between the bathroom and the bathtub hot water when the user bathes in the bathtub, the physical burden on the user due to the temperature difference before and after bathing can be reduced.

As another aspect of the heat source device, Japanese Patent Application Laid-Open No. 2014-25687 (Patent Document 2) has a heating function by passing a heat medium through a circulation path formed between the heat source device and the heating terminal. A device having a reheating function by branching a bypass path including a bath heat exchanger from the circulation path (hereinafter, also referred to as a heating heat source device) is disclosed. In the heating heat source device described in Patent Document 2, by passing a part of the heat medium through the circulation path and the bypass path, the heating function and the reheating function can be exhibited at the same time.

Japanese Unexamined Patent Publication No. 2016-6358 Japanese Unexamined Patent Publication No. 2014-25687

In the heating heat source device described in Patent Document 2, when the user's bathing in the bathtub is detected during the heating operation, the heating operation and the reheating operation for raising the temperature of the hot water in the bathtub are simultaneously executed. become. In such a case, since the flow rate of the heat medium flowing through the bypass path is smaller than that during the non-execution of the heating operation, there is a concern that the reheating ability may be reduced. As a result, it may take some time from the time the user bathes in the bathtub until the temperature of the hot water in the bathtub reaches the target temperature, which may lead to a decrease in the comfort of the user.

The present invention has been made to solve such a problem, and an object of the present invention is to detect bathing in a bathtub during heating operation of a heating heat source device having a heating function and a reheating function. , The temperature of the hot water in the bathtub is to be raised quickly.

In one aspect of the present invention, the heating heat source device performs a heating operation in which a heat medium is circulated and supplied to the heating terminal, and a bath heat retention operation in which the hot water in the bathtub is kept at a target temperature by a reheating operation. The heating heat source device is a heat medium circulation path for circulating the heat medium between the heating terminal and the heating terminal during heating operation, and a heating heat exchanger for heating the heat medium on the heat medium circulation path by the amount of heat from the heat source. The bypass path and the bypass path, which are branched from the heat medium circulation path and are configured so that the heat medium passes through the heat exchanger for heating without passing through the heating terminal and then joins the heat medium circulation path again. It is provided with a bypass control valve for controlling formation and shutoff, and a reheating circulation path including a bath heat exchanger for circulating and heating hot water in the bath during reheating operation. The bath heat exchanger is configured to heat the hot water flowing through the reheating circulation path by the amount of heat of the heat medium flowing through the heat medium circulation path. The heat medium circulation path is configured to pass the heat medium through the bath heat exchanger when the bypass path is formed by opening the bypass control valve. The heating heat source device sets a bathing sensor that detects a person's bathing in the bathtub and a target temperature to the first temperature when the bathing sensor does not detect bathing during the bath heat retention operation, and when bathing is detected. Further, a control device configured to perform a reheating operation by setting the target temperature to a second temperature higher than the first temperature is provided. When bathing is detected during the simultaneous operation of the heating operation and the bath heat insulation operation, the control device temporarily reduces the flow rate of the heat medium supplied to the heating terminal as compared with the case where the bathing is not detected.

According to the above-mentioned heating heat source device, when the bath heat insulation operation and the heating operation are executed at the same time, when it is detected that a person has taken a bath in the bathtub, the bypass route is passed as compared with the case where the bath is not detected. The flow rate can be increased. As a result, when bathing is detected, the amount of heat supplied by the bath heat exchanger to the hot water in the reheating circulation route can be increased, so that the bathtub hot water temperature can be quickly increased.

In the heating heat source device, preferably, the control device is supplied to the heating terminal until the hot water in the bathtub reaches the second temperature when bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation. Reduce the flow rate of the heat medium.

In this way, when the bath heat retention operation and the heating operation are executed at the same time and it is detected that a person has taken a bath in the bathtub, the temperature of the hot water in the bathtub is quickly raised to the second temperature. Can be done.

In the heating heat source device, preferably, the control device reduces the flow rate of the heat medium supplied to the heating terminal for a specified time when bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation.

In this way, when the bath heat retention operation and the heating operation are executed at the same time and it is detected that a person has taken a bath in the bathtub, the temperature of the hot water in the bathtub is raised to the second temperature within the specified time. It can be raised quickly.

In the heating heat source device, preferably, the control device temporarily reduces the flow rate of the heat medium supplied to the heating terminal to zero when bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation. ..

In this way, when the bath heat insulation operation and the heating operation are executed at the same time, when it is detected that a person has taken a bath in the bathtub, the flow rate of the bypass route is increased as compared with the time when the bath is not detected. Therefore, the temperature of the hot water in the bathtub can be raised quickly.

In the heating heat source device, the heating terminal preferably includes at least one low temperature heating terminal. The heat medium circulation path is a first output path leading to a heat medium discharge port connected to at least one low-temperature heating terminal on the inlet side of the heating heat exchanger, and a first passing through at least the heating heat exchanger. A branch portion that branches off the circulation path of the above and at least one low-temperature heating terminal are provided corresponding to each, and the heat medium flows from the first output path to the corresponding heating terminal by being opened during the heating operation. It further comprises at least one first on-off valve configured to allow. The control device closes at least a part of at least one first on-off valve when bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation.

In this way, when the bath heat retention operation and the heating operation of the low temperature heating terminal are executed at the same time, when it is detected that a person has taken a bath in the bathtub, the bypass route is compared with the case where the bath is not detected. The flow rate can be increased. As a result, when bathing is detected, the amount of heat supplied by the bath heat exchanger to the hot water in the reheating circulation route can be increased, so that the temperature of the hot water in the bathtub can be quickly increased.

In the heating heat source device, the heating terminal preferably includes a high temperature heating terminal. The heat medium circulation path is branched from the second output path, which is branched from the bypass path to the heat medium discharge port connected to the high temperature heating terminal, and the second output path on the outlet side of the heating heat exchanger. A second circulation path configured to join the heat medium circulation path without passing through the high temperature heating terminal, and a second on-off valve for controlling the formation and blocking of the second circulation path. Further included. The control device temporarily opens the second on-off valve when bathing is detected during the simultaneous operation of the heating operation and the bath heat insulation operation.

According to this, when the bath heat insulation operation and the heating operation of the high temperature heating terminal are executed at the same time, when it is detected that a person has taken a bath in the bathtub, the bypass route is passed as compared with the case where the bath is not detected. The temperature of the flowing heat medium can be raised. As a result, in the bath heat exchanger, the amount of heat supplied to the hot water in the reheating circulation path can be increased, so that the temperature of the hot water in the bathtub can be quickly increased.

According to the present invention, it is possible to quickly raise the temperature of the hot water in the bathtub when bathing in the bathtub is detected during the heating operation of the heating heat source device having the heating function and the reheating function.

It is a schematic block diagram of the hot water supply system to which the heating heat source apparatus according to the embodiment of this invention is applied. It is a block diagram for demonstrating the flow path of a heat medium in a heating circuit. It is a figure which shows an example of the temporal change of the hot water temperature in a bathtub at the time of a bath heat insulation operation. It is a figure explaining the control of the on-off valve at the time of the detection of bathing. It is a flowchart explaining the processing procedure of the operation control of a hot water supply system at the time of simultaneous execution of heating operation and bath heat insulation operation. It is a flowchart explaining the processing procedure of the change example of the operation control of the hot water supply system at the time of simultaneous execution of heating operation and bath heat insulation operation. It is a figure which shows an example of the temporal change of the hot water temperature in a bathtub at the time of a bath heat insulation operation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the same or corresponding parts in the figure will be labeled with the same reference numerals and the explanation will not be repeated in principle.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram of a hot water supply system 100 to which a heating heat source device according to an embodiment of the present invention is applied.

With reference to FIG. 1, the hot water supply system 100 according to the first embodiment heats and circulates a hot water supply circuit 101 for discharging hot water when opening a hot water tap such as a curan 105 or a shower (not shown) and hot water in a bathtub (not shown). It is provided with a reheating circuit 102 for the purpose, a heating circuit 103 for circulating and supplying hot water as a heat medium of liquid to a plurality of heating terminals (not shown), and a controller 300. The controller 300 is configured by, for example, a microcomputer and corresponds to one embodiment of the "control device".

The reheating circuit 102 is configured to form a reheating circulation path for heating and circulating hot water in the bathtub between the suction port 191 and the discharge port 192. The suction port 191 and the discharge port 192 are each connected to an opening provided in a bathtub adapter (not shown) arranged in the bathtub via a pipe. The heating terminal that receives the heat medium from the heating circuit 103 is connected between the heating return port 302 and the heating output port (low temperature) 304, or between the heating return port 302 and the heating output port (high temperature) 306.

Hereinafter, the configurations of the hot water supply circuit 101, the reheating circuit 102, and the heating circuit 103 will be described in order.

The hot water supply circuit 101 includes a primary heat exchanger 11a, a secondary heat exchanger 21a, and a combustion burner 30a housed in the can body 10a. The hot water supply circuit 101 further includes a water inlet pipe 50, a bypass pipe 60, and a hot water outlet pipe 70.

Tap water or the like is supplied to the water inlet pipe 50. A bypass pipe 60 is arranged between the water inlet pipe 50 and the hot water outlet pipe 70. A distribution valve 80 for controlling the diversion to the bypass pipe 60 is inserted and connected to the water inlet pipe 50. A part of the water supply amount is diverted from the water inlet pipe 50 to the bypass pipe 60 according to the opening degree of the distribution valve 80. The ratio of the diversion to the total water supply amount is controlled according to the opening degree of the distribution valve 80.

Further, a temperature sensor 110 and a flow rate sensor 150 are arranged in the water pipe 50. The temperature sensor 110 detects the incoming water temperature Tw. The flow rate sensor 150 is arranged on the downstream side (can body side) of the distribution valve 80. Therefore, the flow rate Q detected by the flow rate sensor 150 indicates the flow rate (can body flow rate) passing through the can body 10a. The flow rate sensor 150 is typically composed of an impeller type flow rate sensor.

The water in the water inlet pipe 50 is first preheated by the secondary heat exchanger 21a and then mainly heated by the primary heat exchanger 11a. The hot water heated to a predetermined temperature by the primary heat exchanger 11a and the secondary heat exchanger 21a is discharged from the hot water outlet pipe 70.

The hot water outlet pipe 70 is connected to the bypass pipe 60 at the confluence portion 75. Therefore, from the hot water supply system 100, hot water at an appropriate temperature, which is a mixture of high-temperature hot water output from the can body 10a and water from the bypass pipe 60, is used as a hot water pouring circuit for hot water taps in kitchens and bathrooms and baths (not shown). It is supplied to the specified hot water supply points such as.

The hot water outlet pipe 70 is provided with a flow rate adjusting valve 90 and temperature sensors 120 and 130. The temperature sensor 120 is arranged on the upstream side (can body side) of the confluence portion 75 of the hot water discharge pipe 70 with the bypass pipe 60, and detects the output hot water temperature from the can body 10a. The temperature sensor 130 is provided on the downstream side (hot water discharge side) of the confluence portion 75, and detects the hot water discharge temperature Th after the water from the bypass pipe 60 is mixed. The flow rate adjusting valve 90 is provided to control the flow rate of hot water. The temperature sensors 110, 120, 130 are configured by, for example, a thermistor.

In the can body 10a, the combustion burner 30a outputs a mixture of the fuel gas and the combustion air supplied by the blower fan 40. When the air-fuel mixture is ignited by an ignition device (not shown), the fuel gas is burned and a flame is generated. The combustion heat generated by the flame from the combustion burner 30a is given to the primary heat exchanger 11a and the secondary heat exchanger 21a in the can body 10a.

The primary heat exchanger 11a heats the incoming water by heat exchange by the actual heat (combustion heat) of the combustion gas by the combustion burner 30a. The secondary heat exchanger 21a heats the water passed by the latent heat of the combustion exhaust gas from the combustion burner 30a by heat exchange. An exhaust path 15 for discharging the exhaust gas after heat exchange is provided on the downstream side of the can body 10a in the flow direction of the combustion gas. As described above, in the can body 10a, the water supplied from the water inlet pipe 50 is heated by the primary heat exchanger 11a and the secondary heat exchanger 21a by the amount of heat generated by the combustion in the combustion burner 30a.

A source gas solenoid valve 32, a gas proportional valve 33, and a capacity switching valve 35 are arranged in the gas supply pipe 31 to the combustion burner 30a. The original gas solenoid valve 32 has a function of turning on / off the supply of fuel gas to the combustion burner 30a. The gas flow rate of the gas supply pipe 31 is controlled according to the opening degree of the gas proportional valve 33.

The capacity switching valve 35 is controlled to open and close in order to switch the number of burners (the number of burners burned) to which the fuel gas is supplied among the plurality of combustion burners 30a. The amount of heat generated in the can body 10a is proportional to the amount of gas supplied to the entire combustion burner 30a, which is determined by the combination of the number of burners and the gas flow rate. Therefore, it is possible to create in advance a setting map that determines the combination of the opening / closing pattern (the number of burners burned) of the capacity switching valve 35 and the opening degree (gas flow rate) of the gas proportional valve 33 according to the required amount of heat generated.

Next, a configuration related to hot water supply to the bathtub 700 in the hot water supply system 100 including the reheating circuit 102 will be described. In the following, hot water supply to the bathtub 700 will be referred to as “hot water pouring”, while hot water supply to hot water taps (Karan 105, etc.) other than the bathtub 700 will be simply referred to as “hot water supply”.

The hot water supply system 100 further includes a hot water injection pipe 180 for branching from the hot water discharge pipe 70 and supplying hot water to the bathtub 700. The hot water injection pipe 180 is branched from the hot water discharge pipe 70 via the flow rate adjusting valve 90. Further, a pouring solenoid valve 210 and a check valve 220 are inserted and connected to the pouring pipe 180. The pouring pipe 180 is connected to the bath return pipe 190, which will be described later, at the confluence portion 185.

By controlling the opening and closing of the hot water pouring solenoid valve 210 by the controller 300, it is possible to control the formation / blocking of the path for pouring hot water from the hot water supply circuit 101 to the bathtub 700.

The reheating circuit 102 includes a bath return pipe 190, a bath going pipe 195, a reheating circulation pump 400, and a bath heat exchanger 410.

The bath return pipe 190 is provided between the suction port 191 from the bathtub 700 and the suction port of the reheating circulation pump 400. The discharge side of the reheating circulation pump 400 is connected to one end of the bath heat exchanger 410. The other end of the bath heat exchanger 410 is connected to the discharge port 192 to the bathtub 700 by the bath going pipe 195.

During the reheating operation, the reheating circulation pump 400 operates to suck the hot water in the bathtub 700 from the suction port 191 to the hot water supply system 100. Then, a reheating circulation path is formed in which the sucked hot water is returned from the discharge port 192 to the bathtub 700 via the bath return pipe 190, the reheating circulation pump 400, the bath heat exchanger 410, and the bath going pipe 195. Will be done. In the reheating circulation path, temperature sensors 374 and 375 are provided on the input side and the output side of the bath heat exchanger 410, respectively.

The temperature sensor 374 detects the temperature of the hot water in the bathtub 700 (hereinafter, also referred to as “bathtub hot water temperature”) by detecting the temperature of the hot water flowing through the bath return pipe 190. The temperature sensors 374 and 375 are configured by, for example, a thermistor.

During the reheating operation, the thermal valve 330 of the heating circuit 103 is opened. As a result, the heat medium heated by the heating circuit 103, which will be described later, passes through the bath heat exchanger 410. As a result, the hot water in the reheating circulation path is heated by the bath heat exchanger 410, so that the temperature of the hot water in the bathtub can be raised.

Further, the bath return pipe 190 is connected to the hot water pouring pipe 180 at the confluence portion 185. As a result, when the hot water pouring solenoid valve 210 is opened, hot water from the hot water supply circuit 101 is supplied to the confluence portion 185 via the hot water pouring pipe 180. Since the reheating circulation pump 400 is stopped during the hot water pouring operation, the supplied hot water is sent from both the suction port 191 and the discharge port 192 via the bath return pipe 190 and the bath going pipe 195, respectively. Supplied within 700.

A water level sensor 412 is connected to the bath return pipe 190. The water level sensor 412 detects the water level of the hot water in the bathtub 700 based on the water pressure of the hot water circulating in the reheating circuit 102. The water level sensor 412 is, for example, a pressure sensor, and is configured to output an analog voltage to the controller 300 as a signal corresponding to the water level (water pressure). The water level sensor 412 also has a "bathing sensor" for detecting that a person has taken a bath in the bathtub 700.

The controller 300 determines whether a person has entered the bathtub 700 (has taken a bath) or has left the bathtub 700 (has left the bath) based on the analog voltage transmitted from the water level sensor 412. Specifically, the controller 300 determines that a person has entered the bathtub 700 (that is, a person has taken a bath) when the amount of water level rise per unit time exceeds the reference value based on the input analog voltage. .. Further, the controller 300 determines that the person has left the bathtub 700 (that is, the person has left the bathtub) when the amount of water level drop per unit time falls below the reference value based on the input analog voltage.

Next, the heating circuit 103 in the hot water supply system 100 will be described. The heating circuit 103 is provided with a heat medium (representative) between the heating return port 302 and the heating output port (low temperature) 304 and between the heating return port 302 and the heating output port (high temperature) 306 during the heating operation. It is configured to form a circulation path for hot water).

The heating circuit 103 includes a primary heat exchanger 11b, a secondary heat exchanger 21b, and a combustion burner 30b. The primary heat exchanger 11b, the secondary heat exchanger 21b, and the combustion burner 30b are housed in the can body 10b. The primary heat exchanger 11b, the secondary heat exchanger 21b, and the combustion burner 30b may be housed in a can body common to the primary heat exchanger 11a, the secondary heat exchanger 21a, and the combustion burner 30a of the hot water supply circuit.

The primary heat exchanger 11b heats the incoming water by heat exchange by the manifest heat (combustion heat) of the combustion gas by the combustion burner 30b. The secondary heat exchanger 21b heats the water passed by the latent heat of the combustion exhaust gas from the combustion burner 30b by heat exchange. By controlling the opening / closing of the capacity switching valve 36, the number of burners to be supplied with fuel gas (the number of burners burned) among the plurality of combustion burners 30b is switched. Fuel gas is supplied to the combustion burner 30b via the gas supply pipe 31, the original gas solenoid valve 32, and the gas proportional valve 33, which are common to the combustion burner 30a.

Further, the heating circuit 103 includes a heating circulation pump 310, a heating expansion tank 320, a thermal valve 330, pipes 350, 360, 370, 380, 390, an on-off valve 610, a bypass on-off valve 365, and a temperature sensor. 382,384 and the like.

The pipe 350 connects the heating output port (low temperature) 304 and one end of the primary heat exchanger 11b. The pipe 360 is arranged between the other end of the primary heat exchanger 11b and the pipes 362 and 370.

The pipe 380 connects the heating return port 302 and one end (entrance side) of the secondary heat exchanger 21b. The pipe 390 connects the other end (outside side) of the secondary heat exchanger 21b and the heating expansion tank 320. The suction port 311 of the heating circulation pump 310 is connected to the heating expansion tank 320. The discharge port 312 of the heating circulation pump 310 is connected to the branch portion 355 of the pipe 350.

The heating expansion tank 320 is connected to the suction port 311 of the heating circulation pump 310. The heating expansion tank 320 temporarily stores the heat medium circulating in the heating circuit 103. When the water level of the heating expansion tank 320 drops, water can be supplied from the pipe 51 by opening the water supply valve 305.

The pipe 360 is branched into a pipe 362 and a pipe 370. Therefore, the heat medium output from the primary heat exchanger 11b and flowing through the pipe 360 is divided into a path output to the heating output port 306 (high temperature) by the pipe 370 and a path circulated via the pipe 362. Be done. The pipe 370 is further branched into a pipe 371 leading to the pipe 390 via the bypass on-off valve 365 and a pipe 372 leading to the heating output port (high temperature) 306. The pipe 371 is connected to the pipe 390 at the confluence portion 395. The pipe 371 forms a path for circulating the heat medium heated by the primary heat exchanger 11b to the heating expansion tank 320 via the pipe 390.

On the output side of the primary heat exchanger 11b, a temperature sensor 384 for detecting the output temperature (the temperature on the exit side of the can body) from the can body 10b in the heating circuit 103 is arranged. On the other hand, a temperature sensor 382 for detecting the temperature of hot water in the tank is arranged in the heating expansion tank 320. The temperature detected by the temperature sensor 382, Thi, corresponds to the temperature of the heat medium supplied from the heating outlet (low temperature) 304. The temperature sensors 382 and 384 are configured by, for example, a thermistor.

A thermal valve 330 is inserted and connected to the pipe 362. The opening and closing of the thermal valve 330 is controlled according to an opening / closing command from the controller 300. When the thermal valve 330 is opened, the heat medium heated by the primary heat exchanger 11b passes through the bath heat exchanger 410. That is, when the heat valve 330 is opened, there is a path for circulating the heat medium output from the primary heat exchanger 11b to the secondary heat exchanger 21b via the bath heat exchanger 410, the confluence portion 385, and the pipe 380. , Further formed.

With reference to FIG. 1 again, the controller 300 receives an output signal (detection value) from each sensor and a user operation, and generates a control command to each device in order to control the overall operation of the hot water supply system 100. .. User operations include operation on / off commands for the hot water supply system 100 and set hot water temperature commands. For example, user operations are input to a remote controller (not shown).

The control command includes an opening / closing command for each valve, an opening command, and the like. The operation on / off command includes each on / off command of the hot water supply operation and the hot water injection operation by the hot water supply circuit 101, the reheating operation by the reheating circuit 102, and the heating operation by the heating circuit 103. Regarding the heating operation, the heating operation in the hot water supply system 100 may be automatically turned on in response to an on command for the heating terminals 500, 600 (FIG. 2). It is preferable that the set hot water temperature is set separately for each of the hot water supply operation, the hot water pouring operation and the reheating operation. In the heating operation, it is general that the set temperature is not directly input.

During the hot water supply operation and the hot water injection operation, the low temperature water in the water inlet pipe 50 is heated by the combustion in the combustion burner 30a of the hot water supply circuit 101 and output to the hot water outlet pipe 70. The controller 300 calculates the required heat generation amount P * by the combustion burner 30a during the hot water supply operation and the hot water injection operation. The required heat generation amount P * is based on the flow rate detected by the flow rate sensor 150, the incoming water temperature detected by the temperature sensor 110, and the can body outlet side temperature in the hot water supply circuit 101 detected by the temperature sensor 120. Therefore, the detected value of the temperature on the exit side of the can body is calculated so as to be controlled to the target value. The target value of the can body outlet side temperature can be set based on the set temperature during the hot water supply operation and the hot water pouring operation set by the user and the diversion rate of the bypass pipe 60 (opening of the distribution valve 80).

During the reheating operation and the heating operation, the heat medium circulating in the heat medium circulation path formed by driving the heating circulation pump 310 is heated by combustion in the combustion burner 30b. The controller 300 calculates the required heat generation amount P * by the combustion burner 30b so that the detected value of the output temperature (can body outlet temperature) of the primary heat exchanger 11b detected by the temperature sensor 384 is controlled to the target value. do. That is, the required heat generation amount P * by the combustion burner 30b is set to the can body target temperature (Tht *) in the heating circuit 103 and the detection temperature (tank in-hot water temperature Thi, can body outlet temperature Tht) by the temperature sensors 382,384. Based on this, it can be calculated. Typically, the required heat generation amount P * is a deviation between the target temperature rise amount ΔT (ΔT = Tht * -Thi) and the can body exit side temperature in the can body 10b within a range not exceeding the set upper limit value Pmax. It can be calculated based on ΔTht (ΔTht = Tht * −Tht).

The controller 300 calculates the amount of gas supplied to the combustion burners 30a and 30b according to the calculated required heat generation amount P * in each of the hot water supply operation, the hot water injection operation, the heating operation and the reheating operation. Further, the controller 300 determines the combination of the number of burners burned and the gas flow rate among the burners 30a and 30b so as to realize this supply gas amount, and the determined number of burners and the gas flow rate are realized. As described above, the opening and closing of the gas proportional valve 33 and the opening and closing of the capacity switching valves 35 and 36 are controlled.

Further, the controller 300 sets the rotation speed of the blower fan 40 so that the ratio (air-fuel ratio) of the blown amount by the blower fan 40 to the calculated supply gas amount becomes a predetermined value (for example, the ideal air-fuel ratio). Control.

Next, the flow path in the heating circuit 103 of the hot water supply system 100 will be described in more detail.
FIG. 2 is a block diagram for explaining a flow path of a heat medium in the heating circuit 103.

With reference to FIG. 2, a high temperature heating terminal 500 and an on-off valve 510 are connected between the heating return port 302 and the heating output port (high temperature) 306. The opening and closing of the on-off valve 510 is controlled by a controller (not shown) of the high-temperature heating terminal 500.

The on-off valve 510 is opened when the high temperature heating terminal 500 is operated. When the on-off valve 510 is opened, a circulation supply path for the heat medium is formed between the high temperature heating terminal 500 and the heating circuit 103 via the heating return port 302 and the heating output port (high temperature) 306. For example, the high temperature heating terminal 500 is configured by a room heater that outputs hot air heated by a heat medium from the heating circuit 103.

A plurality of low temperature heating terminals 600 are connected between the heating return port 302 and the heating output port (low temperature) 304. An on-off valve 610 is arranged in the path from the pipe 350 to the heating output port (low temperature) 304. The on-off valve 610 is typically configured by a thermal valve. The on-off valve 610 corresponds to one embodiment of the "first on-off valve".

When the on-off valve 610 is opened, a circulation supply path for the heat medium is formed between the corresponding low temperature heating terminal 600 and the heating circuit 103 via the heating return port 302 and the heating output port (low temperature) 304. For example, the low temperature heating terminal 600 is composed of a hot water panel for floor heating through which a heat medium from a heating circuit 103 is passed.

The opening / closing of the on-off valve 610 is controlled by the controller 300 for each heating terminal 600. Each on-off valve 610 is opened when the corresponding low temperature heating terminal 600 is activated. Since the plurality of low-temperature heating terminals 600 are connected in parallel to the heating circuit 103, the operation and stop of each low-temperature heating terminal 600 can be controlled by opening and closing each on-off valve 610. Hereinafter, the high temperature heating terminal 500 and the low temperature heating terminal 600 are also collectively referred to as “heating terminals”.

When the heating circulation pump 310 is activated, the hot water supply system 100 passes through the heating return port 302 and the heating output port (low temperature) 304 and / or the heating output port (high temperature) 306 to the high temperature heating terminal 500 and / or low temperature. A heat medium (hot water) is circulated and supplied to the heating terminal 600. That is, by driving the heating circulation pump 310, a heat medium circulation path is formed in the hot water supply system 100 between the heating return port 302, the heating output port (low temperature) 304, and the heating output port (high temperature) 306. To. Hereinafter, the details of the heat medium circulation path will be described.

By driving the heating circulation pump 310, the suction path 540 from the heating return port 302 to the suction port 311 of the heating circulation pump 310 via the pipe 380, the secondary heat exchanger 21b, the pipe 390, and the heating expansion tank 320. Is formed. The heat medium sucked from the heating expansion tank 320 into the heating circulation pump 310 is output from the discharge port 312 to the branch portion 355 of the pipe 350.

The heat medium from the heating circulation pump 310 is branched into an output path 550 reaching the heating output port (low temperature) 304 and a path 560 passing through the primary heat exchanger 11b at the branch portion 355 of the pipe 350. The path 560 includes an output path 561 that outputs a heat medium from the heating output port (high temperature) 306 after passing through the primary heat exchanger 11b, and a circulation path 562 that returns to the pipe 390 again after passing through the bath heat exchanger 410. ..

The circulation path 562 is a path formed when the thermal valve 330 is opened, and is a path formed after passing through the secondary heat exchanger 21b via the bath heat exchanger 410, the merging portion 385, and the pipe 390, and then the pipe. Return to 390. The circulation path 562 does not pass through the heating terminals (low temperature heating terminal 600 and high temperature heating terminal 500), passes through the primary heat exchanger 11b and the bath heat exchanger 410, and then passes through the heating expansion tank 320 for heating circulation. It is configured to return to the suction port 311 of the pump 310.

The output path 561 includes an output path 561a leading to the heating output port (high temperature) 306 and a circulation path 561b returning to the pipe 390 at the merging portion 395 via the pipe 371 provided with the bypass on-off valve 365. The circulation path 561b is formed when the bypass on-off valve 365 is opened. The bypass on-off valve 365 is typically configured by a thermal valve.

As described above, the circulation path 562 and the circulation path 561b are configured to return to the suction port 311 of the heating circulation pump 310 via the heating expansion tank 320 after passing through at least the primary heat exchanger 11b.

The diversion ratio between the output path 550 and the path 560 in the branch portion 355 is determined by the equivalent pressure drop of the path 560. Therefore, the distribution ratio is determined by opening and closing the thermal valve 330 and the bypass on-off valve 365.

In the configuration of FIG. 2, the output path 550 corresponds to the "first output path" and the path 560 corresponds to the "first circulation path". Further, the branch portion 355 corresponds to a "branch portion" that branches the "first output path" and the "first circulation path".

Further, the primary heat exchanger 11b corresponds to the "heat exchanger for heating", and the combustion burner 30b (FIG. 1) corresponds to the "heat source". Further, the suction path 540, the output path 550, and the path 560 (including the output path 561 and the circulation path 562) form a "heat medium circulation path" in the hot water supply system 100. Further, the heating return port 302 corresponds to the "heat medium return port", and the heating output ports 304 and 306 correspond to the "heat medium discharge port".

Further, the heat medium circulation flow rate by driving the heating circulation pump 310 changes depending on the pressure loss of the heat medium circulation path. Specifically, when the thermal valve 330 is opened, the circulation path 562 is formed, so that the heat medium circulation flow rate in the hot water supply system 100 also increases. Hereinafter, the circulation route 562 is also referred to as a “bypass route”. The thermal valve 330 corresponds to a "bypass control valve" that controls the formation and blocking of a "bypass path". Further, the output path 561a corresponds to the "second output path", the circulation path 561b corresponds to the "second circulation path", and the bypass on-off valve 365 corresponds to one embodiment of the "second on-off valve". do.

As can be understood from the configuration of FIG. 2, the high temperature heating terminal 500 is supplied with high temperature water that has passed through the primary heat exchanger 11b via the on-off valve 510 from the heating output port 306 (high temperature). .. That is, the temperature of the heat medium supplied to the high-temperature heating terminal 500 can be controlled by the can body target temperature Tht * of the heating circuit 103. On the other hand, to the low temperature heating terminal 600, hot water in the heating expansion tank 320 is supplied from the heating output port 304 (low temperature) via the on-off valve 610.

Further, during the reheating operation in which the hot water temperature of the bathtub 700 is raised by the reheating circuit 102 shown in FIG. 1, the reheating circulation path 570 is formed by driving the reheating circulation pump 400 shown in FIG. Further, the thermal valve 330 is opened, and the heat medium heated by the heating circuit 103 passes through the bath heat exchanger 410, so that the hot water circulating in the reheating circulation path 570 is heated and the bathtub hot water temperature is raised. Will be raised.

Next, the reheating operation in the hot water supply system 100 will be described with reference to FIG.
The reheating operation is performed by automatic boiling to the target temperature after the completion of hot water filling, automatic boiling to keep the hot water in the bathtub 700 at the target temperature, or boiling based on the reheating operation command from the remote controller. It will be started.

FIG. 3 is a diagram showing an example of a temporal change in the hot water temperature in the bathtub 700 during the bath heat insulation operation. The horizontal axis of FIG. 3 shows the time, and the vertical axis shows the bathtub hot water temperature detected by the temperature sensor 374 and the bathing and bathing detection signals based on the analog voltage input from the water level sensor 412 (bathing sensor). .. The detection signal is a signal that transitions to the H (logical high) level when a person bathes in the bathtub 700, and transitions to the L (logical low) level when a person leaves the bathtub 700. ..

In the example of FIG. 3, it is assumed that the "bath automatic mode" is instructed from the remote controller, and the hot water filling is completed before the time t0 by executing the hot water pouring operation. By performing the reheating operation after the completion of the hot water filling, the bathtub hot water temperature rises to the first temperature Tb1, which is the target temperature. In the automatic bath mode, after the hot water filling is completed, a bath heat insulating operation for keeping the hot water in the bathtub 700 at the target temperature is performed.

In the bath heat insulation operation, if the bathtub hot water temperature detected by the temperature sensor 374 is equal to or less than the heat insulation lower limit temperature Tb1L, the reheating operation is executed. Specifically, the controller 300 drives the reheating circulation pump 400 at each time interval D1 to circulate the hot water in the bathtub 700 in the reheating circulation path 570. The controller 300 determines the bathtub hot water temperature based on the hot water temperature of the bath return pipe 190 detected by the temperature sensor 374. The controller 300 stops the reheating circulation pump 400 when the bathtub hot water temperature is higher than the heat retention lower limit temperature Tb1L.

On the other hand, if the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb1L, the controller 300 executes the reheating operation. In FIG. 3, the reheating operation is started at the time t1 after the time t0. The controller 300 drives the reheating circulation pump 400 to circulate the hot water in the bathtub 700 to the reheating circulation path 570. Further, the controller 300 heats the heat medium circulating in the heat medium circulation path formed by driving the heating circulation pump 310 by burning with the combustion burner 30b. The controller 300 further opens the thermal valve 330 and allows the heat medium heated by the heating circuit 103 to pass through the bath heat exchanger 410. As a result, the hot water circulating in the reheating circulation path 570 is heated, and the temperature of the hot water in the bathtub rises. When the bathtub hot water temperature detected by the temperature sensor 374 reaches the first temperature Tb1 (time t2), the controller 300 ends the reheating operation.

Here, the hot water supply system 100 according to the present embodiment has a second temperature Tb2, which is a set hot water temperature based on an input setting operation by a user or the like from a remote controller as a target temperature of the hot water temperature in the bathtub 700 in the bath heat retention operation. And a first temperature Tb1 lower than the set hot water temperature. The first temperature Tb1 is set to, for example, a temperature about 2 ° C. lower than the set hot water temperature (second temperature Tb2). The controller 300 sets the target temperature to the first temperature Tb1 when the detection signal of the water level sensor 412 does not detect the bathing of a person in the bathtub 700, and sets the target temperature to the second temperature Tb2 when the bathing is detected. do.

According to this, in the example of FIG. 3, the bathtub water temperature after the completion of hot water filling is kept at the first temperature Tb1 by the reheating operation. Here, it is assumed that it is detected that a person has taken a bath in the bathtub 700 based on the transition of the detection signal based on the analog voltage from the water level sensor 412 from the L level to the H level at time t3. ..

When bathing is detected at time t3, the controller 300 executes a reheating operation in order to raise the bathtub hot water temperature to the second temperature Tb2 (set hot water temperature). When the bathtub hot water temperature rises by this reheating operation and reaches the second temperature Tb2 (time t4), the controller 300 ends the reheating operation.

While a person is bathing in the bathtub 700, the controller 300 intermittently executes a reheating operation in order to keep the bathtub hot water temperature at the second temperature Tb2. In the example of FIG. 3, the controller 300 drives the reheating circulation pump 400 at each time interval D1 after the time t4, and detects the bathtub hot water temperature by the temperature sensor 374. When the detected bathtub water temperature is higher than the heat retention lower limit temperature Tb2L, the reheating circulation pump 400 is stopped.

On the other hand, if the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb2L, the controller 300 executes the reheating operation. In FIG. 3, the reheating operation is started at time t5 after the time t4, and when the bathtub water temperature reaches the second temperature Tb2 again (time t6), the reheating operation is terminated.

In FIG. 3, the second temperature Tb2 is set to a temperature higher than the first temperature Tb1, and the heat retention lower limit temperature Tb2L is set to a temperature higher than the heat retention lower limit temperature Tb1L. The lower limit temperature for heat retention Tb2L is set to be higher than the first temperature Tb1, but the lower limit temperature Tb2L for heat retention may be set to a temperature equal to or lower than the first temperature Tb1.

Next, at time t7, when it is detected that a person has left the bathtub 700 based on the transition of the detection signal based on the analog voltage from the water level sensor 412 from the H level to the L level, the controller The 300 again executes a reheating operation in order to keep the bathtub hot water temperature at the first temperature Tb1. As shown in FIG. 3, when the bathtub water temperature drops after time t7 and becomes the heat retention lower limit temperature Tb1L or less, the controller 300 executes the reheating operation.

Further, when the next person's bathing is detected at time t8 after time t7, the controller 300 executes a reheating operation in order to raise the bathtub water temperature to the second temperature Tb2, and the bathtub water is heated. When the temperature reaches the second temperature Tb2 (time t9), the reheating operation is terminated.

In this way, the hot water supply system 100 performs a reheating operation so as to keep the bathtub hot water temperature at the first temperature Tb1 lower than the set hot water temperature (second temperature Tb2) after the hot water filling is completed at the time of executing the bath heat retaining operation. After a person bathes in the bathtub 700, the bathtub water temperature is raised to the set hot water temperature (second temperature Tb2) by a reheating operation. According to this, it is possible to reduce the burden on the bather's body due to the sudden temperature change that occurs in a series of actions from the room to the dressing room and then bathing, so that the bather feels comfortable. Can be given.

In addition, when a person leaves the bathtub 700 and there is no person in the bathtub 700, the person takes a bath by keeping the bathtub water temperature lower than when the person is bathing in the bathtub 700. It is possible to prevent the bathtub water temperature from becoming too low while suppressing energy consumption while not doing so.

In the example of FIG. 3, the time interval D1 for driving the reheating circulation pump 400 when there is no person in the bathtub 700 and the reheating circulation pump 400 for driving the reheating circulation pump 400 when a person is bathing in the bathtub 700. The time interval D1 is set to be the same length, but these two time intervals may be set to different lengths. For example, when there is no person in the bathtub 700, the opportunity to drive the reheating circulation pump 400 is reduced by lengthening the time interval D1 as compared with the time when a person is bathing in the bathtub 700, which consumes energy. Can be further suppressed.

Here, in order to enhance the comfort of the bather, when it is detected that a person has taken a bath in the bathtub 700 (corresponding to time t3 and t8 in FIG. 3), the bathtub water temperature is changed from the first temperature Tb1 to the first. It is required to quickly raise the temperature to 2 temperature Tb2 (set hot water temperature). For example, it is stipulated that the reheating operation is completed within a specified time after bathing is detected. The specified time is set to, for example, 10 minutes.

For example, when bathing is detected by the water level sensor 412, the target temperature of the can body exit temperature Tht (can body target temperature Tht *) is set higher than that when bathing is not detected, so that the combustion burner can be used. It is conceivable to increase the required heat generation amount P * by 30b. According to this, since the amount of heat given from the combustion burner 30b to the primary heat exchanger 11b increases, the temperature on the outlet side of the can body rises, and as a result, the temperature of the heat medium flowing through the bypass path 562 also rises. It will be. Then, when this high-temperature heat medium passes through the bath heat exchanger 410, the hot water circulating in the reheating circulation path 570 is heated, and the bathtub hot water temperature can be quickly raised.

However, when the reheating operation and the heating operation are simultaneously executed in the hot water supply system 100, in the heat medium circulation path shown in FIG. 2, in addition to the bypass path 562, the output paths 550 and / or 561 are arranged in parallel. Therefore, the flow rate of the bypass path 562 is smaller than that in the case where only the reheating operation is executed. Therefore, since the amount of heat of the heat medium flowing through the bath heat exchanger 410 is reduced as compared with the non-execution of the heating operation, there is a concern that it will be difficult to quickly raise the hot water temperature of the reheating circulation path 570. Will be done.

Further, since the output path 550 is formed in parallel with the path 560 during the heating operation of the low temperature heating terminal 600, the flow rate of the primary heat exchanger 11b is smaller than that during the non-execution of the heating operation. Therefore, as described above, when the required amount of heat P * generated by the combustion burner 30b is increased to increase the amount of heat given from the combustion burner 30b to the primary heat exchanger 11b, the flow rate of the primary heat exchanger 11 is increased. Due to its small size, the can body outlet temperature Tht may rise excessively. As a result, there is concern that combustion will be forced to stop frequently.

Therefore, in the first embodiment, when the bath heat retention operation and the heating operation are executed at the same time and it is detected that a person has taken a bath in the bathtub 700, the on-off valve 610 is temporarily closed. , The output path 550 is blocked.

Specifically, referring to FIG. 3, when the bath heat retention operation and the heating operation of the low temperature heating terminal 600 are executed at the same time, the on-off valve 610 is opened (on) (time t0). Therefore, the hot water supply system 100 circulates and supplies a heat medium (hot water) to the low temperature heating terminal 600 via the output path 550, the on-off valve 610, and the heating output port (low temperature) 304 by driving the heating circulation pump 310. ..

When it is detected that a person has bathed in the bathtub 700 during the heating operation (time t3), the controller 300 temporarily closes (turns off) the on-off valve 610. As a result, after the time t3, the output path 550 is cut off, and the reheating operation is executed with the low-temperature heating terminal 600 stopped.

Since the output path 550 is cut off, the flow rate of the primary heat exchanger 11b increases as compared with the time when bathing is not detected before the time t3, so that the flow rate of the bypass path 562 also increases. As a result, in the bath heat exchanger 410, the amount of heat supplied to the hot water of the reheating circulation path 570 can be increased, and as a result, the hot water temperature of the reheating circulation path 570 can be rapidly increased.

Here, in the example of FIG. 3, when the bathtub hot water temperature reaches the second temperature Tb2 and the reheating operation is completed (time t4), the controller 300 opens the on-off valve 610 and forms the output path 550 again. .. In other words, the controller 300 is configured to temporarily close the on-off valve 610 from the time when it is detected that a person has bathed in the bathtub 700 until the temperature of the bathtub reaches the second temperature Tb2. ..

When a plurality of low-temperature heating terminals 600 are connected to the hot water supply system 100 as in the present embodiment, as shown in FIG. 4, each of them is connected to at least one low-temperature heating terminal 600 in operation. The corresponding at least one on-off valve 610 may be closed.

Specifically, FIG. 4A shows a state in which all of the plurality of low temperature heating terminals 600 are operating by opening all of the plurality of on-off valves 610. In such a state, when bathing is detected by the detection signal from the water level sensor 412, the controller 300 can stop all the plurality of low temperature heating terminals 600 by closing all the plurality of on-off valves 610. can. As a result, the flow rate of the output path 550 becomes zero, so that all the heat medium output from the discharge port 312 of the heating circulation pump 310 passes through the primary heat exchanger 11b. After that, when the bathtub hot water temperature reaches the second temperature Tb2, the controller 300 ends the reheating operation and opens all the plurality of on-off valves 610. As a result, the output path 550 is formed, and the plurality of low temperature heating terminals 600 are operated again.

On the other hand, in FIG. 4B, when the plurality of on-off valves 610 are all opened and the plurality of low-temperature heating terminals 600 are all operating, bathing is detected by the detection signal of the water level sensor 412. , The controller 300 closes a part of the on-off valves 610 out of the plurality of on-off valves 610. Therefore, some low-temperature heating terminals 600 corresponding to some on-off valves 610 are stopped. In this case, the flow rate of the output path 550 is reduced as compared with the time when bathing is not detected, so that the flow rate of the primary heat exchanger 11b is increased. After that, when the bathtub hot water temperature reaches the second temperature Tb2, the controller 300 ends the reheating operation and opens a part of the on-off valve 610. As a result, the output path 550 returns to the original flow rate, and some low-temperature heating terminals 600 operate again.

As described above, in the control of the on-off valve 610 shown in FIG. 4 (A), when bathing is detected, the flow rate of the bath heat exchanger 410 is increased as compared with the time when bathing is not detected, and the bathtub water temperature is changed. The temperature can be raised to 2 temperature Tb2 quickly, but on the other hand, since the plurality of low temperature heating terminals 600 are temporarily stopped, there is a concern that the room temperature of each room may be temporarily lowered.

On the other hand, in the control of the on-off valve 610 shown in FIG. 4 (B), the flow rate of the bath heat exchanger 410 when bathing is detected is reduced as compared with FIG. 4 (A), but it is a part. The heating operation can be continued for the low temperature heating terminal 600 of the above. Therefore, the room temperature of the room in which the part of the low-temperature heating terminal 600 is installed can be maintained.

In FIG. 4B, which on-off valve 610 should be closed when bathing is detected can be determined according to a preset priority. This priority can be stored as a table in, for example, a memory built in the controller 300. When bathing is detected, the controller 300 refers to this table and closes the on-off valve 610 corresponding to some of the low-temperature heating terminals 600 having a relatively low priority among the operating low-temperature heating terminals 600. , The part of the low temperature heating terminal 600 is stopped. Then, after the reheating operation is completed, the controller 300 operates the low-temperature heating terminal 600 again by opening some of these on-off valves 610. According to this, it is possible to maintain the comfort of the user in the room in which the low-temperature heating terminal 600 is installed, while ensuring the comfort of the bather.

FIG. 5 is a flowchart illustrating a processing procedure of operation control of the hot water supply system 100 at the time of simultaneous execution of heating operation and bath heat insulation operation. The control process according to the flowchart shown in FIG. 5 is repeatedly executed by the controller 300 shown in FIG.

With reference to FIG. 5, the controller 300 determines in step S01 whether or not the heating operation is in progress. The determination in step S01 can be executed based on the user's switch operation on the remote controller (not shown).

During the heating operation (when YES is determined in S01), the controller 300 keeps the on-off valve 610 in the open state by step S02, and proceeds to the process in step S03 to determine whether or not the bath heat insulation operation is in progress. do. The determination in step S03 can be executed based on a user's switch operation on a remote controller (not shown). The controller 300 ends the process while the heating operation is not being executed (when NO is determined in S01) or when the heating operation is being performed but the bath heat retention operation is not being executed (when NO is determined in S03).

On the other hand, when the controller 300 is in the heating operation and is in the bath heat insulating operation (when YES is determined in S03), the process proceeds to step S04 to determine whether or not a person has bathed in the bathtub 700. Is determined. The determination in step S04 can be executed based on the detection signal based on the analog voltage from the water level sensor 412.

When the bathing of a person in the bathtub 700 is not detected (NO determination in S04), the controller 300 proceeds to step S17 and sets the target temperature in the bath heat insulating operation to the first temperature Tb1. Subsequently, the controller 300 determines in step S18 whether or not the bathtub hot water temperature is equal to or lower than the heat retention lower limit temperature Tb1L. The determination in step S18 can be executed based on the hot water temperature of the bath return pipe 190 detected by the temperature sensor 374 when the reheating circulation pump 400 is driven at each time interval D1.

If the bathtub water temperature is higher than the heat retention lower limit temperature Tb1L (at the time of NO determination in S18), the controller 300 ends the process. On the other hand, when the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb1L (when YES is determined in S18), the controller 300 advances the process to step S19 and executes the reheating operation. In step S19, the controller 300 opens the thermal valve 330 (bypass control valve), so that the heat medium heated by the heating circuit 103 passes through the bath heat exchanger 410. The controller 300 further drives the reheating circulation pump 400 to heat the hot water circulating in the reheating circulation path 570 by the bath heat exchanger 410.

During the reheating operation, the controller 300 determines in step S20 whether or not the bathtub water temperature is equal to or higher than the first temperature Tb1. When the bathtub water temperature is lower than the first temperature Tb1 (at the time of NO determination in S20), the controller 300 returns the process to step S19 and continues the reheating operation. On the other hand, when the bathtub water temperature becomes the first temperature Tb1 or higher (when YES is determined in S20), the controller 300 advances the process to step S21 and stops the reheating operation.

On the other hand, when it is detected that a person bathes in the bathtub 700 (when YES is determined in S04), the controller 300 sets the target temperature in the bath heat retention operation to the second temperature Tb2 in step S05. Subsequently, the controller 300 determines in step S06 whether or not the bathtub hot water temperature is equal to or lower than the heat retention lower limit temperature Tb2L. The determination in step S06 can be executed based on the hot water temperature of the bath return pipe 190 detected by the temperature sensor 374 when the reheating circulation pump 400 is driven at each time interval D1.

When the bathtub water temperature is higher than the heat retention lower limit temperature Tb2L (at the time of NO determination in S06), the controller 300 ends the process. On the other hand, when the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb2L (when YES is determined in S06), the controller 300 advances the process to step S07, closes the on-off valve 610, and reheats in step S08. Perform a drive.

During the reheating operation, the controller 300 determines in step S09 whether or not the bathtub water temperature is equal to or higher than the second temperature Tb2. When the bathtub water temperature is lower than the second temperature Tb2 (NO determination in S09), the controller 300 returns the process to step S07 and continues the reheating operation while keeping the on-off valve 610 in the closed state.

On the other hand, when the bathtub water temperature becomes the second temperature Tb2 or higher (when YES is determined in S09), the controller 300 advances the process to step S10, opens the on-off valve 610, and stops the reheating operation in step S11. do. After that, the controller 300 intermittently executes the reheating operation in order to keep the bathtub hot water temperature at the second temperature Tb2.

Specifically, the controller 300 determines whether or not a person has left the bathtub 700 in step S12. The determination in step S12 can be executed based on the detection signal from the water level sensor 412.

When a person has not left the bathtub 700 (NO determination in S12), the controller 300 proceeds to step S13 to determine whether or not the bathtub hot water temperature is equal to or lower than the heat retention lower limit temperature Tb2L. If the bathtub water temperature is higher than the heat retention lower limit temperature Tb2L (at the time of NO determination in S13), the controller 300 ends the process. On the other hand, when the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb2L (when YES is determined in S13), the controller 300 advances the process to step S14 and executes the reheating operation. During the reheating operation, the controller 300 determines in step S15 whether or not the bathtub hot water temperature is equal to or higher than the second temperature Tb2, and when the bathtub hot water temperature is lower than the second temperature Tb2 (when NO determination in S15). The process is returned to step S14, and the reheating operation is continued. On the other hand, when the bathtub water temperature becomes the second temperature Tb2 or higher (when YES is determined in S15), the controller 300 advances the process to step S16 and stops the reheating operation.

On the other hand, when returning to step S12 and detecting the withdrawal of a person from the bathtub 700 (when YES is determined in S12), the controller 300 advances the process to step S17 and advances the process to the target temperature in the bath heat insulation operation. Is set to the first temperature Tb1, and it is determined in step S18 whether or not the bathtub hot water temperature is equal to or less than the heat retention lower limit temperature Tb1L.

When the bathtub water temperature is equal to or lower than the heat retention lower limit temperature Tb1L (when YES is determined in S18), the controller 300 advances the process to step S19 and executes the reheating operation. During the reheating operation, the controller 300 determines whether or not the bathtub hot water temperature is equal to or higher than the first temperature Tb1 by step S20, and when the bathtub hot water temperature is lower than the first temperature Tb1 (when NO is determined in S20). Returns the process to step S19 and continues the reheating operation. On the other hand, when the bathtub water temperature becomes the first temperature Tb1 or higher (when YES is determined in S20), the controller 300 advances the process to step S21 and stops the reheating operation.

As for closing the on-off valve 610 in step S07, as shown in FIG. 4 (A), all the on-off valves 610 corresponding to the operating low-temperature heating terminal 600 may be closed, or FIG. 4 (B). As shown in the above, the on-off valve 610 corresponding to a part of the low-temperature heating terminal 600 in operation may be closed.

Further, the on-off valve 610 may be opened in step S10 based on the elapsed time from closing the on-off valve 610 in step S07, regardless of the detection value of the bathtub hot water temperature by the temperature sensor 374. For example, the controller 300 may control to close the on-off valve 610 for a predetermined predetermined time (for example, 10 minutes) when it is detected that a person has bathed in the bathtub 700.

In this control, the controller 300 closes the on-off valve 610 and starts measuring the elapsed time from the time when bathing is detected using the timer (time t3 in FIG. 3). Then, when the measurement time of the timer reaches the specified time, the controller 300 opens the on-off valve 610. According to this, since the bath heat exchanger 410 can increase the amount of heat supplied to the hot water of the reheating circulation path 570 within the specified time, it is possible to quickly raise the hot water temperature of the reheating circulation path 570. Become.

FIG. 6 is a flowchart illustrating a processing procedure of a change example of the operation control of the hot water supply system 100 at the time of simultaneous execution of the heating operation and the bath heat insulation operation. The control process according to the flowchart shown in FIG. 6 is repeatedly executed by the controller 300 shown in FIG.

In the operation control according to the present modification with reference to FIG. 6, it is determined whether or not to open the on-off valve 610 by step S09A instead of step S09 in the flowchart shown in FIG. Since the processes other than step S09A are the same as those in FIG. 5, the description will not be repeated.

In step S09A, the controller 300 determines whether or not the elapsed time from the detection of bathing in step S04 has reached the specified time. When the elapsed time has not reached the specified time (NO determination in S09A), the controller 300 returns the process to step S07 and continues the reheating operation. On the other hand, when the elapsed time reaches the specified time (when YES is determined in S09A), the controller 300 advances the process to step S10, opens the on-off valve 610, and stops the reheating operation in step S11.

As described above, according to the heating heat source device according to the first embodiment, when the bath heat retention operation and the heating operation are performed at the same time and it is detected that a person has taken a bath in the bathtub, the on-off valve 610 By temporarily closing the above and temporarily reducing the flow rate of the heat medium supplied to the low temperature heating terminal 600, the flow rate of the bypass path 562 can be increased as compared with the time when bathing is not detected. .. As a result, when bathing is detected, the amount of heat supplied by the bath heat exchanger 410 to the hot water in the reheating circulation path 570 can be increased, so that the bathtub hot water temperature can be quickly increased.

[Embodiment 2]
With reference to FIGS. 1 and 2 again, in the hot water supply system 100, in the heating operation, the low temperature heating terminal 600 is operated and the high temperature heating is performed except when both the low temperature heating terminal 600 and the high temperature heating terminal 500 are operating. There are cases where the terminal 500 is stopped, or the low-temperature heating terminal 600 is stopped and the high-temperature heating terminal 500 is operating.

At least when the low-temperature heating terminal 600 is operating, it is supplied to the low-temperature heating terminal 600 by controlling the on-off valve 610 described in the first embodiment at the time of simultaneous execution of the heating operation and the bath heat insulation operation. By temporarily reducing the flow rate of the heat medium, the temperature of the hot water in the bathtub can be quickly increased when bathing is detected.

On the other hand, at least when the high temperature heating terminal 500 is operating, it is also possible to execute a control for temporarily reducing the flow rate supplied to the high temperature heating terminal 500 at the time of simultaneous execution of the heating operation and the bath heat insulation operation. , The same action and effect as in the first embodiment can be obtained. In particular, when both the low-temperature heating terminal 600 and the high-temperature heating terminal 500 are operating, in addition to controlling the on-off valve 610, control for temporarily reducing the flow rate of the heat medium supplied to the high-temperature heating terminal 500. By executing the above, the temperature of the hot water in the bathtub can be raised more quickly. According to this, the comfort of the bather can be improved and the time when the heating terminal is stopped can be shortened, so that the comfort of the user in the room can be maintained.

In the second embodiment, the control of the flow rate of the high temperature heating terminal 500 at the time of simultaneous execution of the heating operation and the bath heat insulation operation will be described. In the second embodiment, the configuration and control other than the control of the high temperature heating terminal 500, including the configuration of the hot water supply system 100, are the same as those in the first embodiment.

FIG. 7 is a diagram showing an example of a temporal change in the hot water temperature in the bathtub 700 during the bath heat insulation operation, and is a diagram to be compared with FIG. The horizontal axis of FIG. 7 indicates time, and the vertical axis represents the bathtub hot water temperature detected by the temperature sensor 374 and the bathing / leaving detection signal based on the analog voltage input from the water level sensor 412 (bathing sensor). show.

In the example of FIG. 7, similarly to FIG. 3, the remote co-controller indicates the "bath automatic mode", and it is assumed that the hot water filling is completed before the time t0 by executing the hot water pouring operation. do. The bathtub water temperature rises to the first temperature Tb1 by performing the reheating operation after the completion of the hot water filling. The controller 300 drives the reheating circulation pump 400 at each time interval D1 to circulate the hot water in the bathtub 700 in the reheating circulation path 570. If the hot water temperature (bathtub hot water temperature) of the bath return pipe 190 detected by the temperature sensor 374 is equal to or less than the heat retention lower limit temperature Tb1L, the controller 300 executes the reheating operation. When the bathtub water temperature reaches the first temperature Tb1, the reheating operation is terminated.

Here, it is assumed that in the hot water supply system 100, the bath heat retention operation and the heating operation of the high temperature heating terminal 500 are executed at the same time, and the bypass on-off valve 365 is closed (off).

During the heating operation, the hot water supply system 100 is driven by the heating circulation pump 310 to heat the high temperature heating terminal 500 via the path 560, the output path 561,561a, the heating output port (high temperature) 306 and the on-off valve 510. (Hot water) is circulated and supplied.

When it is detected that a person has bathed in the bathtub 700 at time t3, the controller 300 temporarily opens (turns on) the bypass on-off valve 365. As a result, after the time t3, the reheating operation is executed with the circulation path 561b formed. Due to the formation of the circulation path 561b, the flow rate of the output path 561a is reduced as compared with the time when the bathing is not detected before the time t3, while the high temperature heat medium passes through the pipe 371 and joins the merging portion 395. By forming the circulation path 561b returning to the pipe 390, the temperature of the heat medium passing through the pipe 390 can be raised. Then, by heating this heat medium with the primary heat exchanger 11b, the temperature of the heat medium passing through the bypass path 562 is raised. As a result, the amount of heat of the heat medium of the bath heat exchanger 410 increases, so that the hot water in the reheating circulation path 570 can be quickly heated.

As described above, according to the heating heat source device according to the second embodiment, when the bath heat retention operation and the heating operation are performed at the same time and it is detected that a person has taken a bath in the bathtub 700, the bypass is opened and closed. By temporarily opening the valve 365 to temporarily reduce the flow rate of the heat medium supplied to the high temperature heating terminal 500, the heat medium passing through the bypass path 562 is compared with the case where bathing is not detected. The temperature can be raised. As a result, in the bath heat exchanger 410, the amount of heat supplied to the hot water in the reheating circulation path 570 can be increased, so that the bathtub hot water temperature can be quickly increased.

The control of the bypass on-off valve 365 according to the second embodiment may be executed in combination with the control of the on-off valve 610 according to the first embodiment. That is, when bathing is detected, the on-off valve 610 may be closed and the bypass on-off valve 365 may be opened. According to this, it is possible to increase the flow rate of the heat medium passing through the bypass path 562 and to raise the temperature of the heat medium. Therefore, the bathtub water temperature can be raised more quickly.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10a, 10b can body, 11a primary heat exchanger (hot water supply circuit), 11b primary heat exchanger (heating circuit), 15 exhaust path, 21a secondary heat exchanger (hot water supply circuit), 21b secondary heat exchanger (heating circuit) ), 30a burner (hot water supply circuit), 30b burner (heating circuit), 31 gas supply pipe, 32 source gas electromagnetic valve, 33 gas proportional valve, 35 capacity switching valve (hot water supply circuit), 36 capacity switching valve (heating circuit), 40 blower fan, 50 water inlet pipe, 51 pipe, 60 bypass pipe, 70 hot water outlet pipe, 75 confluence (bypass pipe), 80 distribution valve, 90 flow control valve, 100 hot water supply system, 101 hot water supply circuit, 102 reheating circuit, 103 Heating circuit, 105 callan, 106 drain plug, 110, 120, 130 temperature sensor (hot water supply circuit), 150 flow sensor, 180 pouring pipe, 185 confluence (pouring pipe), 190 bath return pipe, 191 suction port (bath) ), 192 Discharge port (bath), 195 Bath going pipe, 210 Hot water pouring electromagnetic valve, 220 check valve, 300 controller, 302 heating return port, 304 heating output port (low temperature), 306 heating output port (high temperature), 305 Water supply valve, 310 heating circulation pump, 327 overflow tank, 330 thermal valve, 350, 360, 361, 362, 370, 380, 390 piping (heating circuit), 355 branch part, 365 bypass on-off valve, 374, 375 temperature sensor (Reheating circuit), 385,395 confluence (heating circuit), 400 reheating circulation pump, 410 bath heat exchanger, 412 water level sensor, 500 high temperature heating terminal, 510 on-off valve, 540 suction path (heat medium circulation path) 550, 561,561a Output path (heat medium circulation path), 562 circulation path (bypass path), 561b circulation path (heat medium circulation path), 560 path (heat medium circulation path), 570 reheating circulation path, 600 low temperature Heating terminal, 610 on-off valve, 700 tub.

Claims (6)

It is a heating heat source device that executes a heating operation that circulates and supplies a heat medium to the heating terminal and a bath heat retention operation that keeps the hot water in the bathtub at the target temperature by reheating operation.
A heat medium circulation path for circulating the heat medium between the heating terminal and the heating terminal during the heating operation.
A heating heat exchanger for heating the heat medium on the heat medium circulation path by the amount of heat from the heat source, and
A bypass path that is branched from the heat medium circulation path and is configured so that the heat medium passes through the heating heat exchanger without passing through the heating terminal and then rejoins the heat medium circulation path.
A bypass control valve for controlling the formation and blocking of the bypass path, and
It is provided with a reheating circulation path including a bath heat exchanger for circulating and heating the hot water in the bathtub during the reheating operation.
The bath heat exchanger is configured to heat hot water flowing through the reheating circulation path by the amount of heat of the heat medium flowing through the heat medium circulation path.
The heat medium circulation path is configured to allow the heat medium to flow through the bath heat exchanger when the bypass path is formed by opening the bypass control valve.
A bathing sensor that detects a person's bathing in the bathtub,
During the bath heat retention operation, when bathing is not detected by the bathing sensor, the target temperature is set to the first temperature, and when the bathing is detected, the target temperature is set to a second temperature higher than the first temperature. Further equipped with a control device configured to perform the reheating operation by setting to
When the bathing is detected during the simultaneous operation of the heating operation and the bath heat retaining operation, the control device temporarily reduces the flow rate of the heat medium supplied to the heating terminal rather than when the bathing is not detected. A heating heat source device that reduces the number of heat sources. When the bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation, the control device is supplied to the heating terminal until the hot water in the bathtub reaches the second temperature. The heating heat source device according to claim 1, which reduces the flow rate of the heat medium. The control device claims that when the bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation, the flow rate of the heat medium supplied to the heating terminal is reduced for a specified time. The heating heat source device according to 1. The control device claims that when the bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation, the flow rate of the heat medium supplied to the heating terminal is temporarily set to zero. The heating heat source device according to any one of Items 1 to 3. The heating terminal includes at least one low temperature heating terminal.
The heat medium circulation path is
On the entrance side of the heating heat exchanger, a first output path to the heat medium discharge port connected to the at least one low-temperature heating terminal and a first circulation path passing through at least the heating heat exchanger. The branch part that branches off from
At least one is provided corresponding to the at least one low-temperature heating terminal and is configured to allow the heat medium to flow from the first output path to the corresponding heating terminal by being opened during the heating operation. Further equipped with one first on-off valve,
Claims 1 to 3 that the control device closes at least a part of the at least one first on-off valve when the bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation. The heating heat source device according to any one of the above items. The heating terminal includes a high temperature heating terminal.
The heat medium circulation path is
On the exit side of the heating heat exchanger, a second output path branched from the bypass path to the heat medium discharge port connected to the high temperature heating terminal, and a second output path.
A second circulation path that is branched from the second output path and is configured to join the heat medium circulation path without passing through the high temperature heating terminal.
Further includes a second on-off valve for controlling the formation and blocking of the second circulation path.
Any one of claims 1 to 5, wherein the control device temporarily opens the second on-off valve when the bathing is detected during the simultaneous operation of the heating operation and the bath heat retention operation. The heating heat source device described in the section.

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