CN111912091B - Hot water supply system and water heater - Google Patents
Hot water supply system and water heater Download PDFInfo
- Publication number
- CN111912091B CN111912091B CN202010331844.XA CN202010331844A CN111912091B CN 111912091 B CN111912091 B CN 111912091B CN 202010331844 A CN202010331844 A CN 202010331844A CN 111912091 B CN111912091 B CN 111912091B
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- Prior art keywords
- hot water
- water
- water supply
- control
- circulation path
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
- F24H9/139—Continuous flow heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
A hot water supply system and a water heater are provided. Even in the case where the freeze prevention is required after the end of the hot water discharge in the hot water discharge control, the freeze prevention control can be reliably performed. When the water discharge control is performed by stopping the water passage through the water side on-off valve and the water discharge of the hot water is completed in S5, and it is determined in S25 that the freeze prevention is necessary in a state of waiting for the turning-off operation of the hot water discharge switch, the controller opens the water side on-off valve in S26, confirms the water passage state of the circulation path in S27, and operates the circulation pump in S28 when the water passage is not confirmed. When it is confirmed that water is supplied in S27, a notification is made in S9 to urge the hot water supply plug to close without operating the circulation pump, and the freeze prevention control is terminated.
Description
Technical Field
The present invention relates to a hot water supply system and a water heater used for the same, in which heat is preserved by circulating hot water between a heat exchanger of the water heater and an external pipe and heating the hot water, and instant hot water supply can be performed from a hot water supply plug of the external pipe.
Background
As a water heater, a water heater having an instant water heating function by connecting a water return pipe having a circulation pump to a water supply pipe connected to a heat exchanger is known (for example, refer to patent document 1). In this water heater having the instant water heating function, the hot water pipe and the return pipe are connected by the external pipe, and a circulation path is formed by the hot water pipe, the external pipe, the return pipe, and the water supply pipe, and the hot water is circulated by the circulation pump and heated by the heat exchanger in the circulation path, so that a hot water supply system capable of performing a heat-retaining operation is constructed. Therefore, when the hot water supply plug provided in the external pipe is opened, the instant hot water supply can be performed.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2004-286397
Disclosure of Invention
[ problem to be solved by the invention ]
In this hot water supply system, when hot water is discharged from the bathtub, when a hot water discharge switch of a remote controller is pressed in a state in which a user opens a hot water supply plug for the bathtub, a controller serving as a control means burns a burner to start hot water supply to the bathtub, and when it is determined by a water amount sensor or the like that a set hot water amount is reached, an on-off valve provided in a circulation path is closed to stop hot water supply, and a notification to urge the user to close the hot water supply plug is made via the remote controller to release water stop by the on-off valve.
On the other hand, since the water heater is installed outdoors or even indoors, there is a possibility that water in a pipe of a heat exchanger or the like in winter or cold regions freezes due to suction of outside air through an exhaust pipe by negative pressure in a combustion chamber generated by operation of a ventilation fan.
In order to prevent such freezing, in the hot water supply system, it is preferable to perform freezing prevention control of operating the circulation pump in parallel to replace water in a portion where freezing is likely to occur if freezing prevention is necessary if the condition required for freezing prevention is detected by providing an outside air temperature sensor or the like at the suction port of the fan.
However, when the freeze prevention control is required in a state where the user forgets to close the hot water supply plug after the hot water discharge is completed and the hot water supply is stopped in the hot water discharge control, the freeze prevention cannot be performed by replacing the water since the water is stopped by the on-off valve even if the circulation pump is operated. In order to avoid such a situation, the on-off valve is opened in addition to the operation of the circulation pump, and hot water flows out from the hot water supply plug, so that freeze prevention is not performed in the end.
Accordingly, an object of the present invention is to provide a hot water supply system and a water heater capable of reliably performing freeze prevention control even when freeze prevention is required after the hot water discharge is completed in hot water discharge control.
[ means for solving the problems ]
In order to achieve the above object, according to the invention of claim 1, a hot water supply system includes:
a water heater having a burner, a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water outlet pipe connected to the heat exchanger, and a control unit for controlling the burner;
an external piping connected between the hot water outlet pipe and the water supply pipe, and forming a circulation path through which the hot water flowing out of the hot water outlet pipe returns to the water supply pipe and reaches the heat exchanger;
a circulation pump provided in the circulation path;
a hot water supply plug connected to an external pipe and capable of supplying hot water to the bathtub;
a water-passing detection unit that detects water passing accompanying the opening of the hot water supply plug; and
a water stop unit which stops the water passing through the circulation path,
the control unit can control the circulating pump and the water stopping unit, and when the water supply detecting unit confirms that the prescribed hot water amount is supplied to the bathtub through the opening of the hot water supply plug, the control unit can execute the hot water discharging control for stopping the water supply of the circulating path through the water stopping unit,
the hot water supply system further includes a preventive condition detection means for detecting whether or not a predetermined portion in the circulation path satisfies a condition required for freeze prevention,
when the prevention condition detection means detects that the necessary condition for freeze prevention is satisfied in the state where the water passage of the circulation path is stopped by the water stop means during the hot water discharge control, the control means can execute freeze prevention control for operating the circulation pump, and when the control is executed, the water passage of the circulation path by the water stop means is stopped, the water passage state of the circulation path is confirmed by the water passage detection means, and when the water passage is not confirmed, the circulation pump is operated, and when the water passage is confirmed, the water passage of the circulation path is stopped by the water stop means without operating the circulation pump, and the freeze prevention control is ended.
In order to achieve the above object, according to the invention of claim 2, the water heater has a burner, a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water outlet pipe connected to the heat exchanger, and a control unit that controls the burner, wherein the control unit is capable of performing hot water discharge control and freeze prevention control in a state in which the water heater is assembled in the hot water supply system of claim 1.
[ Effect of the invention ]
According to the present invention, when the freeze prevention control is executed in a state in which the water passage in the circulation path is stopped during the hot water discharge control, the water passage is stopped, the water passage state in the circulation path is determined by the water passage detection means, and the circulation pump is operated when the water passage is not confirmed, and the water passage is stopped and the freeze prevention control is ended without operating the circulation pump when the water passage is confirmed, so that the replacement of water by the operation of the circulation pump can be performed when the hot water supply plug is closed, and the replacement of water by the water passage in place of the operation of the circulation pump can be performed when the hot water supply plug is not closed, and therefore, the freeze prevention can be performed in any case. Therefore, even when the freeze prevention is required after the hot water discharge is completed in the hot water discharge control, the freeze prevention control can be reliably performed.
Drawings
Fig. 1 is a schematic view of a hot water supply system.
Fig. 2 is a flowchart of the hot water discharge control (japanese: ) and the freeze prevention control.
Fig. 3 is an explanatory diagram of a monitor display of the portable terminal in the hot water discharge control.
Fig. 4 is a schematic diagram showing a modification of the hot water supply system.
Description of the reference numerals:
1·water heater, 2·frame, 3·combustion chamber, 4·burner unit, 5·heat exchanger, 6·exhaust hood, 7·gas connection port, 8·water supply port, 9·hot water supply port, 10·return water connection port, 11·air pipe, 16·fan, 17·outside air temperature sensor, 18·water supply pipe, 19·hot water outlet pipe, 21·water side opening and closing valve, 22·water inlet temperature sensor, 23·water volume sensor, 24·outlet temperature sensor, 25·hot water outlet temperature sensor, 26·return pipe, 27·circulation pump, 30·external piping, 31 (31A) ·hot water supply plug, 32·bathtub, 35·controller, 36·remote controller, 40·portable terminal, 41·monitor, S hot water supply system.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Structure of Hot Water supply System)
Fig. 1 is a schematic diagram illustrating an example of the hot water supply system S. The hot water supply system S is configured as a hot water supply system having the water heater 1 and the circulation external piping 30 connected to the water heater 1.
First, in the water heater 1, a combustion chamber 3 having 3 burner units 4, a heat exchanger 5, and an exhaust hood 6 is provided in a housing 2 from below. A gas connection port 7 connected to an external gas pipe, a water supply connection port 8 connected to an external water supply pipe, a hot water supply connection port 9 connected to an external hot water supply pipe, and a return water connection port 10 are provided on the bottom surface of the housing 2.
The burner units 4 and … … are composed of a plurality of burners having different numbers, and the gas connection port 7 is connected to a gas pipe 11 having an original solenoid valve 12 (japanese: basic electromagnetic standard) and a proportional control valve 13, and each burner unit 4 is connected to branch pipes 14 and 14 … … branched from the gas pipe 11 via an on-off valve 15. An external air temperature sensor 17 such as a fan 16 for supplying combustion air to the burner unit 4 and a thermistor for detecting the temperature of the outside air sucked into the fan 16 is provided at the lower portion of the combustion chamber 3.
The heat exchanger 5 is a fin tube (fin tube) having a heat transfer tube penetrating in a serpentine manner through a plurality of fins arranged in parallel at predetermined intervals in the thickness direction, and has a water supply pipe 18 connected to the water supply connection port 8 at an inlet side end portion of the heat transfer tube and a hot water outlet pipe 19 connected to the hot water supply connection port 9 at an outlet side end portion of the heat transfer tube. A bypass pipe 20 for bypassing the heat exchanger 5 is connected between the water supply pipe 18 and the hot water discharge pipe 19.
Further, in the water supply pipe 18, a water side on-off valve 21, a water intake temperature sensor 22 such as a thermistor for detecting a water intake temperature, and a water amount sensor 23 for detecting a water amount are provided upstream of the connection portion of the bypass pipe 20. Further, an outlet temperature sensor 24 such as a thermistor for detecting the outlet temperature from the heat exchanger 5 is provided in the hot water outlet pipe 19 on the upstream side of the connection portion of the bypass pipe 20, and a hot water outlet temperature sensor 25 such as a thermistor for detecting the hot water temperature is provided on the downstream side of the connection portion.
A return pipe 26 is connected between the return water connection port 10 and the water supply pipe 18 on the upstream side of the water quantity sensor 23, and the return pipe 26 has a circulation pump 27 and a check valve 28 on the discharge side thereof.
The external pipe 30 is connected between the hot water supply connection port 9 and the return water connection port 10, and has a plurality of hot water supply plugs 31 and … …. One of the hot water supply pins 31 is used to supply hot water to the bathtub 32 (hereinafter, when distinguished from other hot water supply pins 31, it is referred to as "hot water supply pin 31A").
Thereby, the hot water flowing out of the hot water outlet pipe 19 returns to the return pipe 26 through the external pipe 30, reaches the heat exchanger 5 through the water supply pipe 18, and flows out of the hot water outlet pipe 19 again.
In the hot water supply system S configured as described above, when the operation switch provided in the controller 35 or the remote controller 36 is pushed, the controller 35 operates the circulation pump 27 to circulate the hot water in the circulation path. At the same time, the original solenoid valve 12 and the on-off valve 15 are opened to supply fuel gas to the burner unit 4, and the fan 16 is driven to perform ignition control to burn the burner unit 4. The controller 35 controls the opening degree of the proportional control valve 13 and the rotation speed of the fan 16 to perform the warm-up operation so as to be set to the set temperature by the controller 35 or the remote controller 36. Therefore, when any one of the hot water supply pins 31 is opened, the instant hot water supply at the set temperature can be performed.
On the other hand, when the controller 35 presses a hot water discharge switch provided in the controller 35 and the remote controller 36 to open the hot water supply plug 31A, the burner unit 4 is burned, and automatic hot water discharge control is performed so that the hot water at the set temperature is supplied to the bathtub 32 until the amount of water detected by the water amount sensor 23 becomes the set hot water amount.
The controller 35 monitors the temperature detected by the outside air temperature sensor 17, and when it is determined that the water in the heat transfer pipe of the heat exchanger 5 may be frozen due to the cool air flowing in from the exhaust hood 6, can perform freezing prevention control of operating the circulation pump 27 so that the water having the same displacement amount as the water stored in the heat transfer pipe circulates in the circulation path. The automatic hot water discharge control and the freeze prevention control will be described below with reference to the flowchart of fig. 2.
(description of automatic Hot Water discharge control)
In step (hereinafter, simply referred to as "S") 1, when a pressing operation (ON operation) of the hot water discharge switch is confirmed, it is determined in S2 whether or not water passage due to opening of the hot water supply plug 31A is detected by the water amount sensor 23. When water is detected, in S3, the controller 35 starts to fire the burner unit 4 to supply hot water of a set temperature from the hot water supply plug 31A to the bathtub 32. When it is confirmed that the set hot water amount is reached in S4, the water-side opening/closing valve 21 is closed in S5, the hot water discharge is terminated, the hot water discharge switch is blinked, and the pressing operation (OFF operation) of the hot water discharge switch is determined in S6. Here, if the hot water discharge switch is pressed, the water side opening/closing valve 21 is opened in S7, and the presence or absence of water passage is checked by the water amount sensor 23 in S8. If the user closes the hot water supply plug 31A together with the off operation of the hot water discharge switch, water passage is not confirmed (NO in S8), and therefore automatic hot water discharge control (END) is ended with the water side on-off valve 21 kept open, but if the user forgets to close the hot water supply plug 31A, a notification prompting confirmation of the hot water supply plug is made by sound in S9 because water passage is confirmed.
Thereafter, whether or not water is supplied is checked again in S10, and if water supply is not checked, the automatic hot water discharge control is ended, but the water supply state is maintained, and when it is checked in S11 that a predetermined time (for example, 90 seconds) has elapsed, the water-side opening/closing valve 21 is closed in S12, and a notification is made to urge the opening operation of the hot water discharge switch. In S13, if the hot water drain switch is turned off, the automatic hot water drain control ends.
(description of display Screen of Portable terminal)
In the hot water supply system S, by installing application software capable of Wi-Fi communication via the remote controller 36 in the mobile terminal 40 such as a smart phone, confirmation of control and predetermined remote operation can be performed in the mobile terminal 40. Hereinafter, an operation of the portable terminal 40 in automatic hot water discharge control and a display screen of the monitor 41 will be described.
Fig. 3 (a) is a main screen of the application software displayed on the monitor 41, and an icon 42 for automatically discharging hot water is displayed at the lower stage. When the icon 42 is touched, the screen is switched to the screen (B) of fig. 3, and the standby state in which hot water is discharged is set. Since "start" shown here is the same function as the hot water drain switch, when a touch operation is performed on "start", it is YES in S1 of fig. 2, and the subsequent processing is executed. In S2, as shown in fig. 3 (C), a display is made to urge the faucet (here, the hot water supply plug 31A) to be opened, and water is detected, and after the faucet is opened, when a touch operation is performed on "OK" or 5 seconds elapse, hot water discharge is started in S3.
In the hot water discharging process, the current condition (hot water amount) is displayed by the scale 43 and the numerical value of the percentage as shown in (D) of fig. 3 according to the information from the controller 35 via the remote controller 36, and in S4, when the set hot water amount is reached, the numerical value of 100% is displayed as shown in (E) of fig. 3. When the touch operation is performed on "OK", the hot water discharge is terminated in S5, and a display for confirming the closing of the faucet is performed as shown in fig. 3 (F) (S6). When the hot water supply plug 31A is closed and the "yes" is touched, a hot water discharge completion screen of fig. 3 (G) is displayed, the water-side on-off valve 21 is opened in S7, and water passage is detected in S8.
Here, if no water is detected, the main screen is returned, but if water is detected, a screen urging the closing of the faucet is displayed as shown in fig. 3 (H) in S9. If the hot water supply key 31A is closed and the "OK" is touched, a hot water discharge completion screen of fig. 3 (G) is displayed, and if water is not detected, the main screen is returned.
On the other hand, when the predetermined time has elapsed while the detection of water is maintained (S11) without the touch operation of "OK", the water-side opening/closing valve 21 is closed (S12), and the display of fig. 3 (H) is continued (S13). Therefore, unless the hot water supply plug 31A is closed and no water passage is detected, the main screen is not returned.
When the screen of fig. 3 (D) is touched to stop during the hot water discharge, a screen for confirming the interruption of the hot water discharge and the closing of the hot water supply plug 31A is displayed as shown in fig. 3 (I), and when the screen is touched to yes, the hot water discharge interruption screen of fig. 3 (J) is displayed. Here, if no water is detected, the main screen is returned, but if water is detected, a screen urging the closing of the faucet is displayed as shown in fig. 3 (H), and unless water is not detected, the main screen is not returned.
(description of freezing prevention control)
First, the freeze prevention control is executed in a state where the hot water discharge switch is not turned on in S1. In the determination at S21, if the temperature detected by the outside air temperature sensor 17 has fallen to a predetermined temperature, freeze prevention is required, and the circulation pump 27 is operated at S22. Next, in S23, when it is confirmed that the replacement with the water in the heat transfer pipe is completed, in S24, the operation of the circulation pump 27 is stopped and the flow returns to S1. The time required for the replacement of the entire amount of water in the heat transfer pipe is calculated in advance based on the capacity of the circulation pump 27 and the amount of water in the heat transfer pipe, and the completion of the replacement is confirmed based on the elapse of the calculated time.
This transfers water in other parts of the circulation path to the heat transfer pipe, thereby preventing freezing.
In addition, in the automatic hot water discharge control, the freeze prevention control is also performed in a standby state in which the hot water discharge is stopped in S5 and the turning-off operation of the hot water discharge switch is waited in S6. That is, if the temperature detected by the outside air temperature sensor 17 decreases to the predetermined temperature by the determination at S25 in the hold standby state, freeze prevention is required, and the water-side opening/closing valve 21 is opened at S26. If the presence or absence of water is checked in S27, the circulation pump 27 is operated in S28, and when the completion of the replacement with water in the heat transfer pipe is checked in S29, the operation of the circulation pump 27 is stopped in S30 and the flow returns to S1.
On the other hand, if the determination at S27 is yes, that is, if the water passage is confirmed, the operation of the circulation pump 27 is not performed, and the process goes to S9 to notify and the processes at S10 to S13 are performed. By these treatments, since the state in which the hot water supply plug 31A is opened is continued to some extent, the water in the heat transfer pipe is transferred to the circulation path, and the water in the other portion is transferred to the heat transfer pipe, thereby performing substantial replacement. If the determination at S13 is no, that is, if the standby state is a state in which the hot water discharge switch is not turned off, the flow proceeds to S25, and if freeze prevention is required, the subsequent processing is executed.
(effects of the invention relating to freezing prevention control)
According to the hot water supply system S and the water heater 1 of the above-described embodiments, when the outside air temperature sensor 17 (prevention condition detection means) detects a decrease to a predetermined temperature (a condition required for freeze prevention is satisfied), the controller 35 (control means) operates the circulation pump 27 until the water in the heat transfer pipe (predetermined portion) of the heat exchanger 5 is replaced, and thus freeze prevention can be performed only by operating the circulation pump 27 for a short period of time without burning the burner unit 4. Therefore, it is possible to realize freeze prevention that is energy-saving and low-cost, and also reduces the uncomfortable feeling caused by the operation sound of the circulation pump 27.
In particular, since the operation of the circulation pump 27 in response to the detection of the outside air temperature sensor 17 is preset, and only the time required for the completion of the replacement of water in the heat transfer pipe of the heat exchanger 5 is performed, the replacement of water can be reliably performed with the minimum required operation time.
Further, since the water heater 1 has the return pipe 26 and the circulation pump 27 in the housing 2, the hot water supply system S can be easily constructed.
In the above embodiment, the outside air temperature sensor is provided to the fan, but the outside air temperature sensor may be provided at another location or at a plurality of locations. Of course, instead of detecting the outside air temperature, a sensor may be directly provided at a portion where freeze prevention is required to detect the temperature.
Further, the operation of the circulation pump may be performed every time the required conditions such as temperature decrease are satisfied, and the time required for the next replacement may be calculated by detecting the water temperature at the predetermined portion after the replacement of the water, thereby periodically performing the operation of the circulation pump.
Further, in the above-described aspect, a case is assumed in which the entire system is installed in the room and cool air is sucked from the exhaust hood, and therefore, the heat transfer pipe of the heat exchanger is the object of replacement of water, but in the hot water supply system in which the water heater is located outdoors and the external piping is located indoors, the entire water heater is the object of replacement of water.
(effects of the invention related to control of freezing prevention after the end of Hot Water discharge)
According to the hot water supply system S of the above-described aspect, the hot water supply system S further includes the outside air temperature sensor 17, the outside air temperature sensor 17 detects whether or not the heat transfer pipe of the heat exchanger 5 in the circulation path satisfies the condition required for freeze prevention, and when the outside air temperature sensor 17 detects that the temperature is lowered to a predetermined temperature in a state where the water passage through the circulation path is stopped by the water side on-off valve 21 (water stop means) during the hot water discharge control, the controller 35 can execute freeze prevention control for operating the circulation pump 27, and when the freeze prevention control is completed, the water side on-off valve 21 is opened and the water passage state of the circulation path is checked by the water amount sensor 23 (water passage detection means), and when the water passage is not checked, the circulation pump 27 is operated, and when the water passage is checked, the water side on-off valve 21 is closed, and the freeze prevention control is completed.
Thus, when the hot water supply plug 31A is closed, water is replaced by the operation of the circulation pump 27, and when the hot water supply plug 31A is not closed, water is replaced by the water flowing in place of the operation of the circulation pump 27, and in any case, freezing prevention can be performed. Therefore, even in the case where the freeze prevention is required after the end of the hot water discharge in the hot water discharge control, the freeze prevention control can be reliably performed.
As the water stop means, an on-off valve provided in the hot water outlet pipe may be used.
When the flow chart in fig. 2 is shifted from the time when it is determined that freeze prevention is necessary, the predetermined time in S11 from the time when water is detected in S10 to the time when the water-side opening/closing valve is closed again may be longer corresponding to the time when water replacement is completed.
Further, in the above embodiment, the freeze prevention control is performed until the water in the predetermined portion of the heat transfer pipe or the like is replaced, but the invention related to the freeze prevention control after the hot water discharge is completed is not limited to this, and the circulation pump may be operated for a long period of time.
(effects of the invention related to forgetting to close the notification)
According to the hot water supply system S and the water heater 1 of the above-described embodiment, after execution of the hot water discharge control, the controller 35 releases the water supply stop of the circulation path by the water side opening/closing valve 21 (water stop means) (S7), confirms the water supply state of the circulation path by the water amount sensor 23 (water supply detection means) (S8), and when water supply is not confirmed, maintains the released state of the water supply stop (END), and when water supply is confirmed, notifies that the hot water supply plug 31A has forgotten to be closed (S9), and therefore, can reliably notify the user that the hot water supply plug 31A has forgotten to be closed, and perform the closing operation. Therefore, convenience in automatically discharging hot water is improved.
In particular, here, the controller 35 stops the water flow in the circulation path by the water-side opening/closing valve 21 together with the notification that the hot water supply plug 31A has forgotten to be closed, and thus unnecessary water use due to forgetting to close can be prevented.
Further, the portable terminal 40 is further provided with an application software capable of wireless communication with the remote controller 36 having a wireless communication function, and when the water supply sensor 23 detects water supply after execution of the hot water discharge control, the controller 35 notifies the portable terminal 40 that the hot water supply plug 31A has forgotten to be closed via the application software (fig. 3 (H)), whereas the portable terminal 40 releases the notification of forgetting to close only when the confirmation of closing the hot water supply plug 31A is received from the controller 35 (fig. 3 (G)), and can reliably notify the user that the hot water supply plug 31A has forgotten to be closed and perform the closing operation via the portable terminal 40.
In addition to the notification of forgetting to turn off the hot water supply plug of the portable terminal by the screen display, an electronic sound, a synthesized voice, or the like may be performed together.
In addition, in a state where the application software is not started, notification that the hot water supply plug has been forgotten to be closed may be made by a push notification. By performing such push notification, it is possible to reliably notify the user using the mobile terminal.
Further, in the above embodiment, the remote controller has a wireless communication function with the mobile terminal, but the controller may have a wireless communication function regardless of the presence or absence of the remote controller. Even if there are a plurality of mobile terminals, the same application software can perform an operation of automatically discharging hot water and forget to turn off the mobile terminals, but when the timing of performing the operation is different, it is necessary to send the latest state of control to each mobile terminal and share the same information.
In addition, the configuration of the water heater is not limited to the above-described mode, and the number of burner units can be increased or decreased, or the invention can be applied even if the water heater has a latent heat recovery type or the like of the sub heat exchanger.
In the above embodiment, the water return pipe and the circulation pump are provided in the housing and connected to the external pipe, but as shown in fig. 4, the circulation path may be formed by connecting the external pipe 30 to the water pipe 33 connected to the water supply pipe 18 without the water return pipe, and the circulation pump 27 and the check valve 28 may be provided in the external pipe 30. In this case, the circulation pump 27 may be provided in the water pipe 33 or in the water supply pipe 18 on the upstream side of the water amount sensor 23.
Claims (2)
1. A hot water supply system, the hot water supply system comprising:
a water heater having a burner, a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water outlet pipe connected to the heat exchanger, and a control unit for controlling the burner;
an external pipe connected between the hot water outlet pipe and the water supply pipe, and forming a circulation path through which the hot water flowing out of the hot water outlet pipe returns to the water supply pipe and reaches the heat exchanger;
a circulation pump provided in the circulation path;
a hot water supply plug connected to the external pipe and capable of supplying hot water to the bathtub;
a water-passing detection unit that detects water passing accompanying the opening of the hot water supply plug; and
a water stop unit that stops water passage through the circulation path,
the control means can control the circulation pump and the water stop means, and when the water supply detection means confirms that a predetermined amount of hot water is supplied to the bathtub by opening the hot water supply plug, can perform hot water discharge control in which water supply to the circulation path is stopped by the water stop means,
it is characterized in that the method comprises the steps of,
the hot water supply system further includes a preventive condition detection means for detecting whether or not a predetermined portion in the circulation path has a condition required for freeze prevention,
when the required condition for meeting freeze prevention is detected by the preventive condition detection means in a state in which the water passage through the circulation path is stopped by the water stop means in the hot water discharge control, the control means can execute freeze prevention control in which the circulation pump is operated without operating the burner, and when the freeze prevention control is executed, stop of the water passage through the circulation path by the water stop means is released, the water passage state of the circulation path is confirmed by the water passage detection means, and when the water passage is not confirmed, the circulation pump is operated until completion of replacement of the water at the predetermined position in the circulation path is confirmed; when the water supply is confirmed, the circulation pump is not operated, a notification is made that the hot water supply plug is forgotten to be closed, whether the water supply is to be performed is confirmed again, and when a predetermined time has elapsed while the water supply is still maintained, the water supply to the circulation path is stopped by the water stop means, and the freeze prevention control is ended.
2. A water heater having a burner, a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water outlet pipe connected to the heat exchanger, and a control unit controlling the burner, characterized in that,
the control unit is capable of performing the hot water discharge control and the freeze prevention control in a state where the water heater is assembled in the hot water supply system of claim 1.
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| JP2019-089147 | 2019-05-09 | ||
| JP2019089147A JP7226788B2 (en) | 2019-05-09 | 2019-05-09 | Hot water system and water heater |
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| JPS63254332A (en) * | 1987-04-09 | 1988-10-21 | Rinnai Corp | Hot water supply piping system |
| JPH06249512A (en) * | 1993-02-26 | 1994-09-06 | Toto Ltd | Circulation and heat insulation type hot water supply device |
| JP5295065B2 (en) * | 2009-09-30 | 2013-09-18 | 東京瓦斯株式会社 | Hot water system |
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| JP2011242093A (en) * | 2010-05-21 | 2011-12-01 | Corona Corp | Water heater |
| CN104654551A (en) * | 2014-12-18 | 2015-05-27 | 珠海格力电器股份有限公司 | Water heater as well as control method and control device thereof |
| JP2017067332A (en) * | 2015-09-29 | 2017-04-06 | 株式会社コロナ | Water heater |
| CN107367065A (en) * | 2016-05-12 | 2017-11-21 | 青岛经济技术开发区海尔热水器有限公司 | A kind of gas heater antifreeze using water pump and method |
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| JP7226788B2 (en) | 2023-02-21 |
| CN111912091A (en) | 2020-11-10 |
| JP2020183847A (en) | 2020-11-12 |
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