CN111912092B - Hot water supply system and water heater - Google Patents
Hot water supply system and water heater Download PDFInfo
- Publication number
- CN111912092B CN111912092B CN202010331852.4A CN202010331852A CN111912092B CN 111912092 B CN111912092 B CN 111912092B CN 202010331852 A CN202010331852 A CN 202010331852A CN 111912092 B CN111912092 B CN 111912092B
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- Prior art keywords
- hot water
- water
- water supply
- pipe
- heat exchanger
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 337
- 230000002265 prevention Effects 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims description 18
- 230000003449 preventive effect Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 abstract description 20
- 230000008014 freezing Effects 0.000 abstract description 9
- 238000007710 freezing Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
Provided are a hot water supply system and a water heater which can save energy, reduce costs, and reduce the uncomfortable freezing prevention caused by the operation sound of a circulating pump. The hot water supply system (S) comprises: a water heater (1) having a burner (4), a heat exchanger (5), a water supply pipe (18) connected to the heat exchanger (5), a hot water outlet pipe (19) connected to the heat exchanger (5), and a water return pipe (26) connected to the water supply pipe (18) and having a circulation pump (27); an external pipe (30) connected to the hot water outlet pipe (19) and the return pipe (26) to form a circulation path; a hot water supply plug (31) connected to the external pipe (30); and a controller (35) for controlling the burner unit (4) and the circulation pump (27), wherein an outside air temperature sensor (17) for detecting whether or not the heat transfer pipe of the heat exchanger (5) has a condition required for freeze prevention is provided, and the controller (35) causes the circulation pump (27) to operate until the water in the heat transfer pipe is replaced when the detected temperature of the outside air temperature sensor (17) is reduced to a predetermined temperature.
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, the water heater is installed outdoors or, even if installed indoors, external air is sucked through the exhaust pipe by negative pressure in the combustion chamber generated by the operation of the ventilation fan, and water in the piping of the heat exchanger or the like may be frozen in winter or in cold regions.
In order to prevent freezing, a measure is taken to heat the pipe by using a heater or to circulate water by operating a circulation pump and to raise the water temperature by using the waste heat of the circulation pump. Further, when the circulation pump is used, a long operation is required, and thus not only does the cost increase occur, but also the working sound may give a sense of discomfort to the user.
Accordingly, an object of the present invention is to provide a hot water supply system and a water heater capable of preventing freezing, which are energy-saving and low-cost, and which reduce the uncomfortable feeling caused by the operation sound of a circulation pump.
[ 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 pipe connected between the hot water outlet pipe and the water supply pipe, forming a circulation path for returning the hot water flowing out of the hot water outlet pipe to the water supply pipe and reaching the heat exchanger, and connecting the hot water supply plug; and a circulation pump provided in the circulation path and controlled by the control unit, wherein the hot water supply system includes: and a preventive condition detection means for detecting whether or not a predetermined portion in the circulation path has a condition required for freeze prevention, wherein the control means executes freeze prevention control for operating the circulation pump until water in the predetermined portion is replaced when the preventive condition detection means detects that the condition required for freeze prevention is satisfied.
In the invention according to claim 2, in the structure according to claim 1, the operation of the circulation pump associated with the detection by the preventive condition detection means is preset, and only the time required for completion of the replacement of the water in the predetermined portion is performed.
In order to achieve the above object, according to the invention of claim 3, there is provided a water heater including 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, wherein the control unit is capable of performing freeze prevention control in a state in which the water heater is incorporated in the hot water supply system of claim 1 or claim 2.
In the invention according to claim 4, in the structure according to claim 3, a water return pipe having one end connectable to a water supply pipe and the other end connectable to an external pipe is provided in the housing of the water heater, and the circulation pump is provided in the water return pipe.
[ Effect of the invention ]
According to the present invention, when the prevention condition detection means detects that the condition required for freeze prevention is satisfied, the control means causes the circulation pump to operate until the water in the predetermined portion is replaced, so that the burner is not burned, and freeze prevention can be performed by simply causing the circulation pump to operate for a short period of time. Therefore, it is possible to perform freeze prevention with energy saving and low cost, and also with reduced uncomfortable feeling caused by the operation sound of the circulation pump.
According to the invention of claim 2, in addition to the above-described effects, since the operation of the circulation pump in association with the detection by the preventive condition detection means is preset and only the time required for completion of the replacement of water in the predetermined portion is performed, the replacement of water can be reliably performed with the minimum required operation time.
According to the invention of claim 4, in addition to the above effects, the water return pipe and the circulation pump are provided in the housing of the water heater, so that the hot water supply system can be easily constructed.
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: 湯はり) 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 4 … … 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 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 31 … …. 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 outside air temperature sensor 17 is further provided to detect whether or not the heat transfer pipe of the heat exchanger 5 in the circulation path has a condition required for freeze prevention, and when the outside air temperature sensor 17 detects that the air temperature has fallen to a predetermined temperature in a state in which the water passage through the circulation path is stopped by the water side opening/closing valve 21 (water blocking means) during the hot water discharge control, the controller 35 can execute freeze prevention control for operating the circulation pump 27 until the water in the heat transfer pipe is replaced, and when the freeze prevention control is completed, the water side opening/closing valve 21 is opened, the water passage state of the circulation path is checked by the water amount sensor 23 (water passage detecting means), and when the water passage is not checked, the circulation pump 27 is operated, and the water side opening/closing valve 21 is closed, and when the water passage is checked, 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.
(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 (4)
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 controlling the burner;
an external pipe connected between the hot water outlet pipe and the water supply pipe, forming a circulation path for returning the hot water flowing out of the hot water outlet pipe to the water supply pipe and reaching the heat exchanger, and connected to a plurality of hot water supply plugs including a hot water discharge plug for supplying the hot water to the bathtub;
a circulation pump provided in the circulation path and controlled by the control unit;
a water-passing detection unit that detects water passing accompanying opening of each of the hot water supply plugs; and
A water stop unit that stops water passage through the circulation path,
The control means can control 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 supply control in which the water supply to the circulation path is stopped by the water stop means,
The hot water supply system is characterized by comprising:
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 control means detects that the required condition for freeze prevention is satisfied after a predetermined amount of hot water is supplied to the bathtub, the prevention condition detection means releases the stop of the water passage through the circulation path by the water stop means, and when the water passage detection means detects that water is not being passed, the control means performs freeze prevention control for operating the circulation pump until the water in the heat exchanger is replaced.
2. The hot water supply system according to claim 1, wherein,
The operation of the circulation pump in association with the detection by the preventive condition detection means is preset, and only the time required for completion of replacement of the water in the predetermined portion is performed.
3. 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 freeze prevention control in a state where the water heater is assembled in the hot water supply system according to claim 1 or 2.
4. A water heater according to claim 3, wherein,
A water return pipe, one end of which can be connected to the water supply pipe and the other end of which can be connected to the external pipe, is provided in the housing of the water heater, and the circulation pump is provided in the water return pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-089146 | 2019-05-09 | ||
| JP2019089146A JP7315201B2 (en) | 2019-05-09 | 2019-05-09 | Hot water system and water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111912092A CN111912092A (en) | 2020-11-10 |
| CN111912092B true CN111912092B (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010331852.4A Active CN111912092B (en) | 2019-05-09 | 2020-04-24 | Hot water supply system and water heater |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7315201B2 (en) |
| CN (1) | CN111912092B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06249512A (en) * | 1993-02-26 | 1994-09-06 | Toto Ltd | Circulation and heat insulation type hot water supply device |
-
2019
- 2019-05-09 JP JP2019089146A patent/JP7315201B2/en active Active
-
2020
- 2020-04-24 CN CN202010331852.4A patent/CN111912092B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06249512A (en) * | 1993-02-26 | 1994-09-06 | Toto Ltd | Circulation and heat insulation type hot water supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020183846A (en) | 2020-11-12 |
| JP7315201B2 (en) | 2023-07-26 |
| CN111912092A (en) | 2020-11-10 |
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