JP2022127897A - Heating heat source device - Google Patents

Abstract

To suppress unintended output of high temperature water to a bathtub during execution of a sterilization treatment, in a heating heat source device having a heating function by circulation of a heat medium and a reheating function and a sterilization function by circulation of bathtub water.SOLUTION: A heat medium circulation path 510 is formed in operation of a first circulation pump 310 to circulate and supply a heat medium to a heating terminal. A control valve 330 is disposed on the heat medium circulation path 510. A heat exchanger 410 has a primary-side path 411 for circulating the heat medium in opening the control valve 330. A reheating circulation path 520 is formed in operation of a second circulation pump 400 to return the bathtub water from the bathtub to the bathtub after circulating the same in a secondary-side path 412 of the heat exchanger 410. A sterilization lamp 610 is disposed on the reheating circulation path 520 to radiate a beam of light in a wavelength region having sterilization effect in lighting. In a sterilization operation, the controller operates the second circulation pump 400, lights the sterilization lamp 610, and closes the control valve 300.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a heating heat source device, and more particularly to a heating heat source device having a heating function by circulating a heat medium and a reheating function and a sterilization function by circulating bathtub water.

Japanese Patent Application Laid-Open No. 2018-54180 (Patent Document 1) describes a bath system that sterilizes bathtub circulating water with a sterilization lamp typified by a UV (Ultra Violet) lamp for irradiating ultraviolet rays. In the above bath system, the disinfection lamp is arranged in the reheating circulation path for circulating the bathtub water. The bathtub water flowing through the reheating circulation path formed by the operation of the circulation pump is sterilized by ultraviolet irradiation when the sterilization lamp is turned on.

Japanese Patent Application Laid-Open No. 2018-54180

As one aspect of the heating heat source device applied to the bath system, there is a device that has a heating function by circulating a heat medium and a reheating function by circulating bathtub water. In such a heating heat source device, the bath reheating operation is realized using the heat medium flowing through the heating circulation path. Specifically, when the heat medium in the heating circulation path flows through the liquid-liquid heat exchanger via the control valve, the bathtub water flowing through the reheating circulation path is heated, and the reheating operation is performed. done. Therefore, when the reheating operation is not executed in a state in which the heat medium flows through the heating circulation path due to the heating operation, the supply of the heat medium to the liquid-liquid heat exchanger is cut off by closing the control valve.

On the other hand, in the above-described heating heat source device, a heat medium having a temperature higher than normal is supplied to the heating terminal within a predetermined time at the start of the heating operation to rapidly warm the heating terminal (so-called hot dash operation). ) can be performed. In the hot dash operation, the control valve is opened for the purpose of ensuring the flow rate of the heating circulation path.

Therefore, when the hot dash operation is started during the sterilization operation, the heating circulation path is formed with the control valve opened. In this case, since the heated heat medium is supplied to the liquid-liquid heat exchanger, the bathtub water flowing through the reheating circulation path is heated. That is, when the sterilization operation and the hot dash operation are performed at the same time, the reheating operation is substantially performed even though the heating of the bathtub water is not assumed. There is a risk that the hot water that does not flow will be output to the bathtub.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems. To suppress unintended output of high-temperature water into a bathtub during execution of sterilization treatment in a heat source device.

In one aspect of the present invention, a heating heat source device includes a heating medium circulation path, a heat source, a control valve, a heat exchanger, a reheating circulation path, a sterilization lamp, and a controller. The heat medium circulation path is formed when the first circulation pump operates, and circulates and supplies the liquid heat medium to the heating terminals connected to the heating heat source device. The heat source heats the heat medium. The control valve is arranged to be included in the heat medium circulation path. The heat exchanger has a primary path through which the heat transfer medium flows when the control valve is open. The reheating circulation path is formed when the second circulation pump is activated, and returns bathtub water from the bathtub to the bathtub after flowing through the secondary side path of the heat exchanger. The sterilization lamp is arranged so as to be included in the reheating circulation path, and irradiates a light beam in a wavelength range having a sterilization effect when turned on. In the sterilization operation for sterilizing the bathtub water flowing through the reheating circulation path using the sterilization lamp, the controller operates the second circulation pump to light the sterilization lamp, and the control valve The second circulation pump, control valve and sterilization lamp are controlled to close the .

According to the present invention, in a heating heat source device having a heating function by circulating a heat medium, a reheating function by circulating bathtub water, and a sterilization function, unintended high-temperature water is output into the bathtub during the execution of sterilization processing. can be suppressed.

1 is a schematic configuration diagram of a heating heat source device according to an embodiment; FIG. FIG. 4 is a block diagram for explaining a flow path of a heat medium in a heating circuit; 4 is a flow chart explaining opening/closing control of a control valve in the heating heat source device according to the present embodiment. FIG. 4 is a conceptual waveform diagram for explaining opening/closing control of a control valve in the heating heat source device according to the present embodiment; 4 is a flowchart illustrating an example of HD control in heating operation of the heating heat source device; FIG. 10 is a flowchart illustrating another example of HD control in heating operation of the heating heat source device; FIG. 7 is a flowchart illustrating a modification of opening/closing control of the control valve in the heating heat source device according to the present embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

FIG. 1 is a schematic configuration diagram of a heating heat source device 100 according to an embodiment.
Referring to FIG. 1 , heating heat source device 100 includes hot water supply circuit 101 , reheating circuit 102 , heating circuit 103 and controller 300 . The hot water supply circuit 101 is configured to output hot water at an appropriate temperature controlled to a set temperature when a hot water valve such as a tap for a shower (not shown) or the like is opened. The reheating circuit 102 is configured to heat and circulate hot water in a bathtub (not shown). The heating circuit 103 is configured to circulate and supply high-temperature water, which is a liquid heat medium, to a heating terminal (not shown) connected to the heating heat source device 100 . Controller 300 is configured by, for example, a microcomputer. Controller 300 corresponds to one embodiment of "controller."

The reheating circuit 102 is configured to form a reheating circulation path for heating and circulating the hot water in the bathtub between the bathtub water inlet 191 and the bathtub water outlet 192 . The bathtub water inlet 191 and the bathtub water outlet 192 are connected via pipes to openings provided in a bathtub adapter (not shown) arranged in the bathtub.

A heating terminal (not shown) that receives the heat medium from the heating circuit 103 is located 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. connected to

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

Hot water supply circuit 101 includes a primary heat exchanger 11a, a secondary heat exchanger 21a, and a combustion burner 30a housed in boiler body 10 . 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 branch flow to the bypass pipe 60 is inserted and connected to the water inlet pipe 50 . A portion of the water supply is diverted from the water inlet pipe 50 to the bypass pipe 60 according to the opening degree of the distribution valve 80 .

Furthermore, a temperature sensor 110 and a flow rate sensor 150 are arranged in the water inlet pipe 50 . A temperature sensor 110 detects the incoming water temperature. The flow rate sensor 150 is arranged downstream (on the can body side) of the distribution valve 80 and detects the flow rate passing through the can body 10 (can body flow rate).

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 11 a and the secondary heat exchanger 21 a is discharged from the hot water discharge pipe 70 .

The tapping pipe 70 is connected to the bypass pipe 60 at a junction 75 . Therefore, from the heating heat source device 100, hot water of a suitable temperature obtained by mixing the high-temperature water output from the boiler body 10 and the low-temperature water from the bypass pipe 60 is supplied to hot water taps in the kitchen, bathroom, etc., or to a bath (not shown). It is supplied to a predetermined hot water supply point such as a hot water pouring circuit.

Hot water outlet pipe 70 is provided with a flow control valve 90 and temperature sensors 120 and 130 . The temperature sensor 120 is arranged on the upstream side (the can body side) of the junction 75 of the hot water outlet pipe 70 and the bypass pipe 60 to detect the hot water temperature output from the can body 10 . Temperature sensor 130 is provided on the downstream side (hot water outlet side) of junction 75 and detects the outlet hot water temperature after the water from bypass pipe 60 is mixed. A flow control valve 90 is provided to control the flow rate of discharged hot water.

In the can body 10 , the combustion burner 30 a outputs a mixture of fuel gas and 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 combusted to generate a flame. 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 within the can body 10. As shown in FIG.

The primary heat exchanger 11a heats the incoming water by heat exchange with the sensible heat (combustion heat) of the combustion gas generated by the combustion burner 30a. The secondary heat exchanger 21a heats water through heat exchange with the latent heat of the flue gas from the combustion burner 30a. An exhaust path 15 is provided on the downstream side of the can body 10 in the flow direction of the combustion gas for exhaust treatment of the combustion exhaust gas after heat exchange. Thus, in the can body 10, 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 combustion in the combustion burner 30a.

A source gas electromagnetic valve 32, a gas proportional valve 33, and capacity switching valves 35a to 35c are arranged in the gas supply pipe 31 to the combustion burner 30a. The source gas solenoid valve 32 has a function of turning on and 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 of the gas proportional valve 33 . The capacity switching valves 35a to 35c are controlled to open/close in order to switch the number of burners to which the fuel gas is supplied (burner combustion number) among the plurality of combustion burners 30a.

Next, a configuration related to hot water supply to the bathtub in the heating heat source device 100 including the reheating circuit 102 will be described. In the following description, the hot water supply to the bathtub will be referred to as "hot water supply", while the hot water supply to the hot water taps other than the bathtub (such as the faucet 105) will simply be referred to as "hot water supply".

Heating heat source device 100 further includes hot water supply pipe 180 branching from hot water supply pipe 70 for supplying hot water to a bathtub (not shown). The hot water pouring pipe 180 branches from the hot water outlet pipe 70 via the flow control valve 90 . Furthermore, a pouring open/close valve 210 and a check valve 220 are inserted and connected to the pouring pipe 180 . The hot water pouring pipe 180 is connected to a bath return pipe 194 to be described later at a junction 185 .

The controller 300 controls the opening/closing of the pouring open/close valve 210 to control formation/cutting of a path for pouring hot water from the hot water supply circuit 101 to the bathtub. A flow sensor 215 for detecting the pouring flow rate is arranged corresponding to the pouring open/close valve 210 .

The reheating circuit 102 includes a bath return pipe 194 , a bath going pipe 195 , a reheating circulation pump 400 , a bath heat exchanger 410 and a UV unit 600 .

Bath return pipe 194 connects between bathtub water suction port 191 and one end of the secondary side path of bath heat exchanger 410 . The reheating circulation pump 400 is inserted and connected to the bath return pipe 194 . The other end (bathtub side) of the secondary path of the bath heat exchanger 410 is connected to the bath water discharge port 192 by a bath going piping 195 .

During the reheating operation, the reheating circulation pump 400 is operated to suck the bathtub water in the bathtub from the bathtub water inlet 191 into the heating heat source device 100 . Then, the sucked hot water passes through the bath return pipe 194, the reheating circulation pump 400, the bath heat exchanger 410 (secondary side path), and the bath going pipe 195, from the bathtub water discharge port 192 into the bathtub. A reheating circulation path is formed to return to the In the reheating circulation path, temperature sensors 372 and 374 are provided on the input side and the output side of bath heat exchanger 410, respectively. The temperature sensors 372, 374 are configured by, for example, thermistors. Hereinafter, the temperature detected by temperature sensor 374 arranged on the output side of bath heat exchanger 410 is also referred to as outlet temperature Tch.

During the reheating operation, the control 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, flows through the bath heat exchanger 410 on the primary side. As a result, the hot water in the reheating circulation path passing through the secondary side path of the bath heat exchanger 410 is heated by liquid-liquid heat exchange with the heat medium passing through the primary side path of the bath heat exchanger 410. , the temperature of the hot water in the bathtub can be increased.

Note that the control valve 330 can typically be configured by a thermal valve that is controlled to open and close. Alternatively, in order to control the flow rate of the heat medium passing through the bath heat exchanger 410 (primary side path), the control valve 330 can be configured by a flow control valve whose degree of opening can be controlled.

Furthermore, the bath return pipe 194 is connected with the pouring pipe 180 at a junction 185 . As a result, when hot water supply opening/closing valve 210 is opened, hot water from hot water supply circuit 101 is supplied to junction 185 via hot water supply pipe 180 . Since the reheating circulation pump 400 is stopped during the hot water pouring operation, the supplied hot water passes through the bath return pipe 194 and the bath going pipe 195, respectively, to the bathtub water inlet 191 and the bathtub water outlet 192. Both feed into the tub. Thereby, a hot water pouring path from hot water supply circuit 101 to the bathtub is formed.

The UV unit 600 is arranged in the bath return pipe 194 so that bathtub water flows. The UV unit 600 incorporates a UV lamp 610 for irradiating the flowing bathwater with ultraviolet rays. That is, the UV lamp 610 is configured to irradiate a light beam (ultraviolet rays) in a wavelength range having a sterilizing effect when turned on, and corresponds to an example of a "sterilization lamp".

The UV lamp 610 is arranged so as to be included in the reheating circulation path into which the bathtub water is introduced by the operation of the reheating circulation pump 400 . The bathtub water passing through the UV unit 600 is sterilized by ultraviolet irradiation when the UV lamp 610 is turned on, thereby reducing the number of germs. The UV unit 600 containing the UV lamp 610 may be arranged anywhere on the reheating circulation path. In addition, in the present embodiment, the UV lamp 610 is exemplified as the “sterilization lamp”, but fluorescent lamps other than the UV lamp 610 may be used as long as they irradiate light rays in a wavelength range having a sterilization effect when lit. It is also possible to configure a "sterilization lamp" using a light-emitting diode (LED) or the like.

In heating heat source apparatus 100 according to the present embodiment, disposing UV unit 600 makes it possible to perform sterilization treatment on bathtub water flowing through the reheating circulation path. The sterilization process can be performed by operating the reheating circulation pump 400 and lighting the UV lamp 610 regardless of the presence or absence of heating by the bath heat exchanger 410, that is, even when the reheating operation is not performed.

Next, the heating circuit 103 in the heating heat source device 100 will be described.
In the heating circuit 103, during heating operation, a heat medium (representative Specifically, it is configured to form a circulation path for high temperature water).

A heating terminal (not shown) is connected between the heating return port 302 and the heating output port (low temperature) 304 . The heating terminal on the low temperature side is configured by, for example, a hot water panel for floor heating through which the heat medium from the heating circuit 103 flows. Similarly, a heating terminal (not shown) is connected between the heating return port 302 and the heating output port (high temperature) 306 . The heating terminal on the high temperature side is configured by, for example, a room heater that outputs warm air heated by a heat medium from the heating circuit 103 .

Heating circuit 103 includes primary heat exchanger 11b and secondary heat exchanger 21b, and combustion burner 30b. The primary heat exchanger 11b, the secondary heat exchanger 21b and the combustion burner 30b are housed in the boiler body 10 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 with the sensible heat (combustion heat) of the combustion gas generated by the combustion burner 30b. The secondary heat exchanger 21b heats water through heat exchange with the latent heat of the flue gas from the combustion burner 30b. By controlling the opening/closing of the capacity switching valves 36a and 36b, the number of burners to which the fuel gas is supplied (burner combustion number) among the plurality of combustion burners 30b is switched. Fuel gas is supplied to the combustion burner 30b via a gas supply pipe 31, a source gas solenoid valve 32, and a gas proportional valve 33, which are common to the combustion burner 30a.

Furthermore, the heating circuit 103 includes a heating circulation pump 310, a heating expansion tank 320, a control valve 330, pipes 350, 360, 370, 380, 390, a terminal thermal valve 305, and temperature sensors 382, 384. include.

One end of the pipe 350 is connected to one end (inlet side) of the primary heat exchanger 11b. The other end of the pipe 350 is connected to a plurality of heating output ports (low temperature) 304 via a plurality of terminal thermal valves 305 .

Pipe 360 is arranged between the other end (outlet side) of primary heat exchanger 11 b and pipe 380 . As will be described later, piping 360 is provided with bath heat exchanger 410 and control valve 330 . Pipes 360 and 370 are branched on the same side (exit side) of primary heat exchanger 11b, and pipe 370 connects the other end of primary heat exchanger 11b and heating output port 306 (high temperature). .

A pipe 380 connects between the heating return port 302 and one end (inlet side) of the secondary heat exchanger 21b. A pipe 390 connects between the heating expansion tank 320 and the other end (outlet side) of the secondary heat exchanger 21b.

A suction port 311 of the heating circulation pump 310 is connected to the heating expansion tank 320 . Discharge port 312 of heating circulation pump 310 is connected to branch 355 of pipe 350 .

Heating expansion tank 320 temporarily stores the heat medium circulating in heating circuit 103 . When the water level in the heating expansion tank 320 is low, water can be supplied from the pipe 51 by opening the water supply valve 327 . Also, when the water level rises, the heat medium can be discharged from the overflow tank 328 to the drain plug 106 via the pipe 325 . Although not shown, the drain (condensed water) generated inside the can body 10 is stored in a drain tank (not shown) and discharged to the outside after being neutralized.

A control valve (typically, a thermal valve) 330 whose opening and closing is controlled according to a command from the controller 300 is inserted and connected to the pipe 360 . When the control valve 330 is opened, the heat medium heated by the primary heat exchanger 11b is divided into a route that is output to the heating output port 306 (high temperature) through the pipe 370 and a route that is circulated through the pipe 360. be done. Therefore, when the control valve 330 is opened, the heat medium output from the primary heat exchanger 11b passes through the pipe 360, the bath heat exchanger 410 (primary side route), the junction 385, and the pipe 380 to the secondary heat. A route for circulation to the exchanger 21b is further formed. On the other hand, when the control valve 330 is closed, the heat medium output from the primary heat exchanger 11b is supplied only to the pipe 370 without passing through the bath heat exchanger 410 (primary side path).

A temperature sensor 384 is arranged on the output side of the primary heat exchanger 11b to detect the output temperature from the can body 10 in the heating circuit 103, that is, the heat medium temperature after heating. On the other hand, the heating expansion tank 320 is provided with a temperature sensor 382 for detecting the temperature of the heat medium inside the tank. The low temperature heat medium temperature detected by the temperature sensor 382 corresponds to the temperature of the heat medium supplied from the heating outlet (low temperature) 304 . The temperature sensors 382, 384 are composed of, for example, thermistors.

Controller 300 receives an output signal (detected value) from each sensor and a user's operation, and generates a control command to each device in order to control the overall operation of heating heat source device 100 . The user's operation includes a command to turn on/off the heating heat source device 100 and a set hot water temperature command. Furthermore, in the heating heat source device 100 equipped with the UV unit 600 , the user operation includes an ON/OFF command for disinfection operation using the UV lamp 610 . As for the sterilization operation, it is possible to provide a timer operation function that specifies the sterilization end time, assuming that the remaining hot water in the bathtub will be used for washing the next morning. In this case, the user operation includes the eradication end time. For example, these user operations are input to a remote controller (not shown).

The controller 300 sets the lighting time of the UV lamp 610 for sterilization according to user's operation. In the sterilization operation (timer sterilization operation) in which the sterilization end time is specified, the lighting time of the UV lamp 610 is set by the controller 300 so that the number of bacteria in the bathtub water is equal to or less than a predetermined value at the sterilization end time. Set automatically.

The control commands include opening/closing and opening degree commands for each valve, commands for the combustion burners 30a and 30b (combustion ON/OFF and generated heat quantity), ON/OFF commands for the heating circulation pump 310, and the like. The operation ON/OFF command includes ON/OFF commands for hot water supply operation and hot water pouring operation by hot water supply circuit 101 , reheating operation by reheating circuit 102 , and heating operation by heating circuit 103 . As for the heating operation, the heating operation in the heating heat source device 100 may be automatically turned on in response to an ON command to the heating terminal.

During the hot water supply operation and the hot water pouring operation, the low-temperature water in the water inlet pipe 50 is heated by combustion in the combustion burner 30 a of the hot water supply circuit 101 and is output to the hot water outlet pipe 70 . The controller 300 calculates the required amount of heat generated P* by the combustion burner 30a during the hot water supply operation and the hot water pouring operation. For example, the required amount of heat generated P* is calculated so that the detected value of the can body delivery side temperature is controlled to the target value. The target value of the boiler outlet side temperature can be set based on the set temperatures set by the user for the hot water supply operation and the hot water pouring operation and the flow diversion ratio of the bypass pipe 60 (opening degree of the distribution valve 80).

During the reheating operation and the heating operation, the heat medium circulating in the 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 quantity P* generated by the combustion burner 30b so that the output temperature of the primary heat exchanger 11b detected by the temperature sensor 384 (temperature sensor 384) is controlled to a target value.

The controller 300 calculates the amount of gas to be supplied to the combustion burners 30a and 30b according to the calculated required heat generation P* in each of the hot water supply operation, hot water pouring operation, heating operation, and reheating operation. Further, the controller 300 determines a combination of the number of combustion burners and the gas flow rate of the combustion burners 30a and 30b so as to realize this supply gas amount, and the determined number of combustion burners and gas flow rate are realized. , the opening degree of the gas proportional valve 33 and the opening/closing of the capacity switching valves 35a to 35c, 36a and 36b are controlled. Further, the controller 300 adjusts the rotation speed of the blower fan 40 so that the ratio of the amount of air blown by the blower fan 40 (air-fuel ratio) to the calculated supply gas amount becomes a predetermined value (for example, the ideal air-fuel ratio). Control.

During the sterilization operation, controller 300 generates a control signal for instructing operation and stop of reheating circulation pump 400 and a control signal for instructing lighting and extinguishing of UV lamp 610 . The reheating circulation pump 400 operates or stops according to the control signal. The UV lamp 610 is lit or extinguished according to the presence or absence of supply of power supply voltage according to the control signal.

Next, the flow paths in the heating circuit 103 of the heating heat source device 100 will be described in more detail.
FIG. 2 is a block diagram for explaining the flow path of the heat medium in the heating circuit 103. As shown in FIG.

Referring to FIG. 2, in heating circuit 103, heating circulation pump 310 and combustion burner 30b operate to form heat medium circulation path 510 described below, thereby circulating and heating the heat medium (hot water). That is, the heating circulation pump 310 corresponds to an embodiment of the "first circulation pump".

By the operation of the heating circulation pump 310, an intake path 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 drawn into heating circulation pump 310 from heating expansion tank 320 is output from outlet 312 to branch 355 of pipe 350 .

The heat medium discharged from the heating circulation pump 310 passes through an output path leading to the terminal thermal valve 305 and the heating output port (low temperature) 304 at the branch portion 355 of the pipe 350, and the primary heat exchanger 11b that receives heat from the combustion burner 30b. and a heating path passing through. The heating route includes an output route for outputting the heat medium from the heating output port (high temperature) 306 via the pipe 370 after passing through the primary heat exchanger 11b, and a pipe 360 and the bath after passing through the primary heat exchanger 11b. Heat exchanger 410 (primary side path 411 ) and return path to heating expansion tank 320 via junction 385 , piping 380 , secondary heat exchanger 21 b and piping 390 . The return path is formed when control valve 330 is open, and is not formed when control valve 330 is closed.

During heating operation, the heating circulation pump 310 and the combustion burner 30b are operated to form the heat medium circulation path 510, so that the heating terminal connected to the heating output port 306 (high temperature) is connected to the primary heat exchanger 11b. The hot heat transfer medium that has passed through is supplied. On the other hand, the heat medium in the heating expansion tank 320 is supplied to the heating terminal connected to the heating output port 304 (low temperature). Thereby, the heat medium is supplied from the heating heat source device 100 (heating circuit 103) to the heating terminal (not shown). Combustion burner 30b, primary heat exchanger 11b and secondary heat exchanger 21b constitute a "heat source".

During heating operation, the control valve 330 may be in either an open state or a closed state. On the other hand, the flow rate of the heat medium passing through the heat exchangers (secondary heat exchanger 21b and primary heat exchanger 11b) increases. Therefore, the temperature of the heat medium can be quickly increased by opening the control valve 330 to form the return path. For example, in the heating heat source device 100, a heat medium having a temperature higher than usual (that is, after the predetermined time has passed) is supplied to a specific heating terminal until a predetermined time has passed since the start of the heating operation. Then, so-called hot dash control (hereinafter also referred to as HD control) can be performed in order to quickly warm up the heating terminal. At this time, the above-described operation mode in which the control valve 330 is opened can be applied. For example, when HD control is executed, the temperature of the heat medium supplied from the heating output port to the low-temperature heating terminal is raised from approximately 60° C. at normal times to approximately 70° C. HD control corresponds to "rapid heating operation". HD control is not normally applied to high temperature heating terminals.

In the reheating circuit 102 , a reheating circulation path 520 including the secondary side path 412 of the bath heat exchanger 410 is formed between the bathtub 190 and the reheating circulation pump 400 by operating the reheating circulation pump 400 . During the reheating operation, the heat medium circulation path 510 is formed with the control valve 330 open, so that the bathtub water flowing through the reheating circulation path 520 is distributed to the primary side path 411 and the secondary side path 411 of the bath heat exchanger 410. It is heated by liquid-liquid heat exchange between the secondary passages 412 .

The reheating circulation path 520 is formed by the operation of the reheating circulation pump 400 also during execution of the sterilization operation. Further, the bathtub water flowing through the reheating circulation path 520 is sterilized by turning on the UV lamp 610 built in the UV unit 600 .

Here, in the heating heat source device 100, the heating of the bathtub water is not assumed by starting the HD control when the sterilization operation is executed. 310 and the operation of the combustion burner 30b form a heat medium circulation path 510 in some cases. In this case, since the heated heat medium flows through the primary-side path 411 of the bath heat exchanger 410, the bathtub water flowing through the reheating circulation path 520 flows through the primary-side path 411 of the bath heat exchanger 410 and It is heated by heat exchange between the secondary heat exchangers 412 . In other words, in the case where the sterilization operation and the HD control are executed at the same time, the reheating operation is substantially executed even though the bathtub water is not heated, resulting in an unintended high temperature. Water may be output to bathtub 190 .

Therefore, in heating heat source apparatus 100 according to the present embodiment, control valve 330 is closed and opening of control valve 330 is prohibited during execution of the sterilization operation according to the control process shown in FIG. However, even during the sterilization operation, the control valve 330 is opened during the reheating operation.

FIG. 3 is a flow chart illustrating opening/closing control of control valve 330 in heating heat source apparatus 100 according to the present embodiment. Control processing according to the flowchart shown in FIG. 3 is repeatedly executed by controller 300 shown in FIG.

Referring to FIG. 3, controller 300 determines in step S01 whether or not the sterilization operation is being performed. As described above, the determination in step S01 can be executed based on the user's switch operation on a remote controller (not shown).

During the sterilization operation (when determined as YES in S01), the controller 300 advances the process to step S02 and supplies power supply voltage to the UV lamp 610 to turn on the UV lamp 610. FIG.

The controller 300 determines whether or not the reheating operation is being performed in step S03. As described above, the determination in step S03 can be executed based on the user's switch operation on a remote controller (not shown).

When the controller 300 is in the sterilization operation and in the reheating operation (when determined as YES in S03), the process proceeds to step S08 and the control valve 330 is opened. On the other hand, when the sterilization operation is being performed and the reheating operation is not being executed (NO determination in S03), the process proceeds to step S04 and the control valve 330 is closed. That is, the controller 300 closes the control valve 330 during the sterilization operation except during the reheating operation. As shown in FIG. 2, by closing the control valve 330, in the heat medium circulation path 510, the heat medium that has passed through the primary heat exchanger 11b flows through the piping 360 and the bath heat exchanger 410 (primary side path 411). , junction 385, pipe 380, secondary heat exchanger 21b, and pipe 390, the return path to heating expansion tank 320 is not formed. Therefore, even if the heat medium circulation path 510 is formed by the operation of the heating circulation pump 310 and the combustion burner 30b during the sterilization operation, the bathtub water flowing through the reheating circulation path 520 will not flow through the bath heat exchanger. Heating due to liquid-liquid heat exchange between the primary side passage 411 and the secondary side passage 412 of 410 can be suppressed.

Returning to step S01, when the sterilization operation is not executed (NO determination in S01), the controller 300 stops the supply of the power supply voltage to the UV lamp 610 in step S06 to turn off the UV lamp 610. Turn off the light. Further, controller 300 permits opening of control valve 330 in step S06. That is, controller 300 permits the formation of the return path in heat medium circulation path 510 .

The controller 300 determines whether or not the reheating operation is being performed in step S07. As described above, the determination in step S07 can be executed based on the user's switch operation on a remote controller (not shown).

The controller 300 opens the control valve 330 in step S08 during the reheating operation (when determined as YES in S07). On the other hand, when the reheating operation is not being performed (NO in S07), the controller 300 proceeds to step S09 to determine whether HD control is being applied. HD control is executed at a predetermined time at the start of heating operation. The determination in step S09 can be executed based on whether the elapsed time from the start of the heating operation has exceeded a predetermined time.

During application of HD control (when determined as YES in S09), controller 300 opens control valve 330 in step S08. On the other hand, when the HD control is not applied (NO determination in S09), the controller 300 closes the control valve 330 in step S10.

FIG. 4 is a conceptual waveform diagram for explaining the opening/closing control of control valve 330 in heating heat source apparatus 100 according to the present embodiment. FIG. 4 shows operation waveforms of the control valve 330 depending on the presence or absence of the reheating operation, the sterilization operation, and the HD control.

Referring to FIG. 4, at time t0, heating heat source device 100 is in the reheating mode and is not in the heating mode. At this time, in the reheating circuit 102 , the reheating circulation path 520 ( FIG. 2 ) is formed by the operation (ON) of the reheating circulation pump 400 . In heating circuit 103, heat medium circulation path 510 (FIG. 2) is formed by operating heating circulation pump 310 and combustion burner 30b with control valve 330 open.

At time t1 during the reheating operation, when the sterilization operation is started according to the user's operation, in the reheating circuit 102, the UV lamp 610 is lit while the reheating circulation pump 400 is operated. The lighting time of the UV lamp 610 is set according to the user's operation. Since the reheating operation is being performed at time t1, the control valve 330 in the heating circuit 103 is not closed and is kept open. After time t1, in reheating circulation path 520, heating of bathtub water by bath heat exchanger 410 and sterilization of bathtub water by UV unit 600 are performed in parallel.

When the reheating operation is stopped at time t2, the heating heat source device 100 performs the sterilization operation alone. Therefore, the control valve 330 is closed. Further, in response to the stop of the reheating operation, in the heating circuit 103, the operation of the heating circulation pump 310 and the combustion burner 30b is stopped, so the heat medium circulation path 510 is not formed.

When the heating operation is started at time t3 during the sterilization operation, HD control is executed until time t5 when a certain period of time has elapsed since the start of the heating operation. Therefore, from the time t3 when the HD control starts to the time t4 when the sterilization operation ends, the HD control is executed simultaneously with the sterilization operation. During the period from time t3 to time t4, in heating circuit 103, heating circulation pump 310 and combustion burner 30b operate to form heating medium circulation path 510, but control valve 330 is closed. Therefore, formation of a return path for the heat medium that has passed through the primary heat exchanger 11b to reach the heating expansion tank 320 via the bath heat exchanger 410 (primary side path 411) is prevented. As a result, it is possible to suppress the bathtub water flowing through the reheating circulation path 520 from being heated by liquid-liquid heat exchange in the bath heat exchanger 410 .

When the sterilization operation ends at time t4, the control valve 330 is opened because opening of the control valve 330 is permitted. In the heating circuit 103, the heat medium circulation path 510 is formed with the control valve 330 open. In the reheating circuit 102, the reheating circulation pump 400 is stopped according to the end of the sterilization operation, and the reheating circulation path 520 is not formed.

When HD control ends at time t5, control valve 330 is closed in heat medium circulation path 510, and normal heating operation is performed. When the heating operation ends, heating circulation pump 310 and combustion burner 30b are stopped, and heat medium circulation path 510 is not formed.

When the heating operation is restarted at time t6 while the heating operation is stopped, HD control is executed until time t9 when a certain period of time has elapsed since the start of the heating operation. Since the sterilization operation is not being executed at this time, in the heating circuit 103, the heat medium circulation path 510 is formed with the control valve 330 opened.

When the timer sterilization operation is started at time t7 after the HD control is started, the lighting time of the UV lamp 610 is set repeatedly intermittently until the sterilization end time arrives. A set of a non-lighting time and a lighting time is regarded as one control cycle, and a plurality of control cycles are set by calculating backward so that the last lighting time ends at the sterilization end time.

When the lighting time of the UV lamp 610 is set during application of HD control, the control valve 330 is temporarily closed during the lighting time of the UV lamp 610 (period from time t7 to time t8). Since the formation of the above-described return path in heat medium circulation path 510 is prevented, it is possible to suppress the bathtub water flowing through reheating circulation path 520 from being heated by heat exchange in bath heat exchanger 410. can.

On the other hand, since the HD control is performed with the control valve 330 closed during the sterilization operation, there is concern that a rapid rise in the heat medium temperature may be suppressed. Therefore, in the present embodiment, when HD control is applied, the target temperature of the can body delivery side temperature Tht (can body target temperature Tht*) is changed according to the state of the control valve 330 . That is, the required amount of heat generated P* by the combustion burner 30b is changed according to the state of the control valve 330. FIG.

FIG. 5 is a flowchart illustrating an example of HD control in heating operation of the heating heat source device. The control process according to the flowchart shown in FIG. 5 is repeatedly executed by controller 300 while the heating operation is on.

Referring to FIG. 5, controller 300 determines in step S21 whether or not conditions for starting HD control are satisfied. The HD control start condition is satisfied, for example, when the heating operation is started. Even when the heating operation is started, if the temperature of the hot water in the heating expansion tank 320 detected by the temperature sensor 382 is higher than the predetermined temperature, the determination in step S21 may be NO.

Controller 300 performs a normal heating operation when the conditions for starting HD control are not satisfied (NO in S21). In this case, the can body target temperature Tht* is set to the predetermined value T0. For example, T0 is set so that the temperature of the heat medium output from the heating output port (low temperature) 304 is approximately 60.degree.

When the conditions for starting HD control are met (YES in S21), the controller 300 advances the process to S22 to determine whether the control valve 330 is open or closed. If control valve 330 is closed (YES in S22), controller 300 advances the process to S23 to determine whether opening of control valve 330 is permitted. When control valve 330 is closed by the control process according to the flowchart shown in FIG. 3 and opening of control valve 330 is prohibited (S04), a NO determination is made in step S23.

On the other hand, if the control valve 330 is open (NO determination in S22), the controller 300 sets the can body target temperature Tht* to the default value T1 in HD control (Tht*=T1) in step S26. . For example, T1 is set so that the temperature of the heat medium output from the heating output port (low temperature) 304 is about 80.degree.

On the other hand, when control valve 330 is closed and opening of control valve 330 is prohibited (NO in S23), controller 300 advances the process to step S27, The temperature Tht* is set to a predetermined value T2 higher than the default value T1 (T1<T2). For example, T2 is set so that the temperature of the heat medium output from the heating output port (low temperature) 304 is approximately 83°C. Thus, through steps S26 and S27, target can body temperature Tht* in HD control is set to T1 or T2 depending on whether control valve 330 is open or closed. In the process of FIG. 5, when the control valve 330 is in the closed state, the target temperature Tht* in the HD control is increased from the default value T1, so that the heat source (combustion burner 30b, primary heat exchanger 11b and secondary heat The amount of heating by the exchanger 21b) is increased.

In step S28, the controller 300 determines whether or not the conditions for ending the HD control are satisfied. For example, in step S28, it is determined whether or not the elapsed time from the HD control circuit has exceeded a predetermined time.

The controller 300 repeatedly executes the processes of steps S22 to S27 until the time elapsed from the start of HD control exceeds a predetermined time (NO determination in S28). On the other hand, when the elapsed time from the start of HD control exceeds the predetermined time (YES determination in S28), controller 300 advances the process to step S29 and ends HD control. Until the current heating operation is turned off, a NO determination is made in step S21 in the flowchart of FIG. 5, and the can body target temperature Tht*=T0 is set (S25). This makes it possible to apply the HD control only at the start of the heating operation.

FIG. 6 is a flowchart illustrating another example of HD control in the heating operation of the heating heat source device. The control process according to the flowchart shown in FIG. 6 is repeatedly executed by controller 300 while the heating operation is on. The flowchart of FIG. 6 replaces step S27 in the flowchart of FIG. 5 with step S30.

In FIG. 6, when the control valve 330 is closed and the opening of the control valve 330 is prohibited (NO determination in S23), the controller 300 advances the process to step S30 to Tht* is set to a predetermined value T3 lower than the default value T1 (T0<T3<T1). For example, T3 is set so that the temperature of the heat medium output from the heating output port (low temperature) 304 is approximately 77°C. In this way, through steps S26 and S30, target can body temperature Tht* in HD control is set to T1 or T3 depending on whether control valve 330 is open or closed.

In HD control, the amount of heat given from the combustion burner 30b to the primary heat exchanger 11b increases. Therefore, when the control valve 330 is closed, the flow rate of the primary heat exchanger 11b decreases. There is a concern that combustion will be forced to stop frequently due to an excessive increase in Tht. Therefore, in the process of FIG. 6, when the control valve 330 is in the closed state, the target body temperature Tht* in the HD control is lowered below the default value T1 so that the heat sources (the combustion burner 30b, the primary heat exchanger 11b and the secondary heat exchanger 11b) The amount of heating by the secondary heat exchanger 21b) is reduced.

As described above, according to the heating heat source device according to the present embodiment, in the operation mode in which the reheating circulation path is formed without heating the bathtub water, by closing the control valve 330, Even if the heat medium circulation path is formed in the bath, the heat medium heated by the heat source does not pass through the bath heat exchanger 410 (primary side path). As a result, the bathtub water flowing through the reheating circulation path is prevented from being heated by the heat exchange in the bath heat exchanger 410, so that unintended high-temperature bathtub water is prevented from being output to the bathtub. be able to.

In the above-described embodiment, the operation mode for forming the reheating circulation path without heating the bathtub water is the sterilization operation for sterilizing the bathtub water. Not limited to driving. For example, this operation mode is also applied to an operation in which bath water mixed with minute bubbles is sprayed into the bathtub (hereinafter also referred to as bubble operation).

In a bath apparatus having an air bubble operation function, a circulation adapter with an air bubble generating function is installed on the side wall of the bathtub in order to spray bathtub water mixed with air bubbles into the bathtub. The circulation adapter is connected to the reheating circulation path. As a result, it is possible to pour hot water into the bathtub and reheat the bathtub water via the circulation adapter. Further, by forming a reheating circulation path by operating the reheating circulation pump 400, it is also possible to output a jet water flow containing air bubbles in the bathtub.

Although not shown, the circulation adapter includes a reheating hot water outlet for introducing heated bath water into the bathtub, an air bubble hot water outlet for introducing bath water mixed with air bubbles into the bathtub, and a flow path. and a path switching mechanism. The channel switching mechanism opens the reheating hot water outflow channel and blocks the bubble hot water outflow channel to discharge normal hot water. It is configured to be switchable between a state in which bubbly hot water is jetted out.

During bubble operation, the jet water stream containing bubbles produces a body warming effect on the bather. However, when HD control is started during air bubble operation, heating of the bathtub water is not assumed, while control valve 330 is open and heat is generated by the operation of heating circulation pump 310 and combustion burner 30b. In some cases, a medium circulation path 510 is formed. In this case, the bubbling operation and the reheating operation are substantially performed at the same time even though the heating of the bathtub water is not assumed, and there is a risk that an unintended high-temperature jet water flow is output. .

Therefore, in heating heat source apparatus 100 according to the present embodiment, control valve 330 is closed and opening of control valve 330 is prohibited during execution of the air bubble operation according to the control process shown in FIG.

FIG. 7 is a flowchart illustrating a modification of the opening/closing control of control valve 330 in heating heat source device 100 according to the present embodiment. Control processing according to the flowchart shown in FIG. 7 is repeatedly executed by controller 300 shown in FIG.

Referring to FIG. 7, controller 300 determines in step S11 whether or not the air bubble operation is being performed. The determination in step S11 can be executed based on the user's switch operation on a remote controller (not shown).

The controller 300 advances the process to step S12 and closes the control valve 330 during operation of the air bubble treatment (when determined as YES in S11). As described above, by closing the control valve 330, in the heat medium circulation path 510, the heat medium that has passed through the primary heat exchanger 11b flows through the pipe 360, the bath heat exchanger 410 (primary side path 411), the confluence point 385, pipe 380, secondary heat exchanger 21b, and pipe 390, the return path to heating expansion tank 320 is not formed. Therefore, even if the heat medium circulation path 510 is formed by the operation of the heating circulation pump 310 and the combustion burner 30b during the bubble operation, the bathtub water flowing through the reheating circulation path 520 is Heating due to liquid-liquid heat exchange between the primary side passage 411 and the secondary side passage 412 can be suppressed.

Returning to step S01, when non-execution during bubble operation (NO determination in S11), controller 300 permits opening of control valve 330 in step S13. That is, controller 300 permits the formation of the return path in heat medium circulation path 510 .

The controller 300 determines whether or not the reheating operation is being performed in step S14. As described above, the determination in step S14 can be executed based on the user's switch operation on a remote controller (not shown).

The controller 300 opens the control valve 330 in step S15 during the reheating operation (when determined as YES in S14). On the other hand, when the reheating operation is not being executed (NO in S15), the controller 300 proceeds to step S16 to determine whether HD control is being applied. HD control is executed at a predetermined time at the start of heating operation. The determination in step S16 can be executed based on whether or not the elapsed time from the start of the heating operation has exceeded a predetermined time.

During application of the HD control (YES determination in S16), the controller 300 opens the control valve 330 from step S15. On the other hand, when the HD control is not applied (NO determination in S16), the controller 300 closes the control valve 330 in step S17.

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

100 heating heat source device, 300 controller, 310 heating circulation pump, 330 control valve, 400 reheating circulation pump, 410 bath heat exchanger, 411 primary side passage, 412 secondary side passage, 510 heat medium circulation passage, 520 reheating circulation Path, 610 UV lamp.

Claims (7)

A heating heat source device,
a heating medium circulation path for circulating and supplying a liquid heating medium to a heating terminal connected to the heating heat source device, which is formed when the first circulation pump is activated;
a heat source for heating the heat medium;
a control valve arranged to be included in the heat medium circulation path;
a heat exchanger having a primary passage through which the heat medium flows when the control valve is opened;
a reheating circulation path formed when the second circulation pump is activated, in which bath water from the bathtub is returned to the bathtub after flowing through the secondary side path of the heat exchanger;
a sterilization lamp disposed so as to be included in the reheating circulation path and emitting a light beam in a wavelength range having a sterilization effect when lit;
In the sterilization operation for sterilizing the bathtub water flowing through the reheating circulation path using the sterilization lamp, the second circulation pump is operated to light the sterilization lamp, and the A heating heat source apparatus comprising a controller that controls the second circulation pump, the control valve, and the sterilization lamp so as to close the control valve. In the reheating operation for heating the bathtub water, the heat exchanger heats the bathtub water flowing through the reheating circulation path by the heat amount of the heat medium flowing through the heat medium circulation path. configured as
2. The heating heat source apparatus according to claim 1, wherein said controller opens said control valve during simultaneous operation of said sterilization operation and said reheating operation. 3. The heating heat source device according to claim 1, wherein said controller permits opening of said control valve while said sterilization operation is not being performed. The controller has means for executing a rapid heating operation for raising the temperature of the heat medium with the control valve open during a period from the start of the heating operation to the elapse of a predetermined time. ,
4. The heating heat source apparatus according to any one of claims 1 to 3, wherein said controller prohibits opening of said control valve during simultaneous operation of said sterilization operation and said rapid heating operation. When executing the rapid heating operation with the control valve closed, the controller increases the amount of heating by the heat source more than when executing the rapid heating operation with the control valve open. The heating heat source device according to claim 4, wherein When executing the rapid heating operation with the control valve closed, the controller reduces the amount of heating by the heat source more than when executing the rapid heating operation with the control valve open. The heating heat source device according to claim 4, wherein It is connected to the reheating circulation path and forms a flow path for introducing the heated bathtub water into the bathtub during the reheating operation, while supplying the bathtub water with bubbles mixed in the bathtub during the bubble operation. Further comprising a channel switching means configured to form a channel for introducing,
2. The method according to claim 1, wherein in the bubble operation, the controller controls the second circulation pump and the control valve so as to operate the second circulation pump and close the control valve. Heating heat source equipment.

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