CN113465188A - Water heater backwater control system, water heater and backwater control method thereof - Google Patents
Water heater backwater control system, water heater and backwater control method thereof Download PDFInfo
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- CN113465188A CN113465188A CN202110882069.1A CN202110882069A CN113465188A CN 113465188 A CN113465188 A CN 113465188A CN 202110882069 A CN202110882069 A CN 202110882069A CN 113465188 A CN113465188 A CN 113465188A
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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
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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
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Abstract
The invention discloses a water heater backwater control system, a water heater and a backwater control method thereof, belonging to the technical field of heat energy, and comprising a circulating pump, a water heater main body, a heat accumulator, a water heater outlet, a first electric control throttle valve, a second electric control throttle valve and a third electric control throttle valve; the switching of multiple modes is realized by controlling the opening and closing of the plurality of electrically controlled throttle valves, the series working mode can quickly provide hot water, and the heat supplementing working mode can supplement heat for the heat accumulator while providing the hot water under the condition that the working capacity of a main machine of the water heater is sufficient, so that the hot water is sufficient when the next water is used; the full-circulation mode is suitable for the frequent condition of water consumption, can guarantee that hot water in the pipeline is sufficient, and the half-circulation mode is suitable for when the hot water demand is lower, can only circulate the heat accumulator, utilizes the good thermal insulation performance of heat accumulator, realizes low power circulation, has avoided the heat energy extravagant.
Description
Technical Field
The invention belongs to the technical field of heat energy, and particularly relates to a water heater backwater control system, a water heater and a backwater control method thereof.
Background
The water heater is a hot water unit which can realize water heating through gas or mainly realizes hot water supply to an indoor pipeline through pipeline communication, but in daily life, hot water in the pipeline of the water heater can mostly stay in the pipeline for cooling after stopping use, so that the pipeline at the far end needs to wait for a long time to realize hot water supply when water is discharged; in addition, although the prior art discloses the technical characteristics of providing the heat accumulator, how to efficiently and energy-efficiently replenish water to the heat accumulator, rather than using the heat accumulator as a water storage type water heater, is a problem to be solved in the art.
Chinese patent document CN101957053A discloses a control method for a water heater, so that a user can accurately know the temperature of hot water in the water heater and the amount of available hot water. Through the water heater, including pressure-bearing water tank, manual operator and detection controller with locate on the box temperature-sensing element is n, detect the controller including control circuit and display circuit, control circuit is including detection module, judge module and the module that the control unit started and stops, has realized can accurately sensing the inside temperature of box and available hot water volume, nevertheless when the in-service use, still has certain defect, if lack the return water control ability to water heater outlet pipe way, leads to the consumption of hydrothermal energy before the circulation easily, can not be fine satisfies the user demand.
Disclosure of Invention
The invention aims to: the water heater backwater control assembly, the water heater and the backwater control method are provided for solving the problem that the water heater is easy to consume heat energy before circulation due to the lack of backwater control capability of a water outlet pipeline of the water heater.
In order to achieve the purpose, the invention adopts the following technical scheme:
the water heater comprises a circulating pump, a water heater main body, a heat accumulator, a water heater outlet, a first electric control throttle valve S1, a second electric control throttle valve S2 and a third electric control throttle valve S3, wherein a control circuit board is arranged in the water heater main body, and a cold water inlet, a hot water outlet and a water return port are arranged in the water heater main body; a flow sensor is arranged at the outlet of the water heater; one end of the first electrically controlled throttle valve S1 is connected to a hot water outlet of the water heater main body and one end of a third electrically controlled throttle valve S3 through a tee joint, respectively, and the other end of the third electrically controlled throttle valve S3 is connected to the first port of the heat accumulator; the other end of the first electronic control throttle valve S1 is respectively connected to the outlet of the water heater and one end of a second electronic control throttle valve S2 through a tee joint, and the other end of the second electronic control throttle valve S2 is connected to a second interface of the heat accumulator; the control circuit board is electrically connected to the first electrically controlled throttle valve S1, the second electrically controlled throttle valve S2, the third electrically controlled throttle valve S3 and the outlet of the water heater.
Furthermore, a first temperature sensor is arranged at a hot water outlet of the water heater main body, and a second temperature sensor is arranged in the heat accumulator.
Further, when the flow sensor detects that the outlet of the water heater works and the detection value of the first temperature sensor is lower than that of the second temperature sensor, the water return control system of the water heater enters a series working mode, the control circuit board controls the first electronic control throttle valve S1 to be closed, and the second electronic control throttle valve S2 and the third electronic control throttle valve S3 are fully opened and control the water heater main body to work.
Further, when the flow sensor detects that the outlet of the water heater works and the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water return control system of the water heater enters a heat supplementing working mode, the circulating pump is started, the control circuit board controls the second electronic control throttle valve S2 to be fully opened, the first electronic control throttle valve S1 and the third electronic control throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor to the residual flow of the water heater body, wherein L0 is the rated flow of the water heater body.
Further, the water heater return control system may be in a full circulation mode and a half circulation mode when the flow sensor does not detect that the water heater outlet is operating, based on a user setting.
Further, when the water heater return water control system is in a full circulation mode, the control circuit board controls the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be closed, and the first electronic control throttle valve S1 is fully opened; and when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump and the water heater main body are started.
Further, when the water heater return water control system is in a half-cycle mode, the control circuit board controls the first electronic control throttle valve S1 and the second electronic control throttle valve S2 to be closed, and the third electronic control throttle valve S3 is fully opened; and when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump and the water heater main body are started.
Furthermore, the water heater main body is provided with an intelligent temperature regulation and control module for controlling the outlet water temperature of the hot water port.
The control method of the water heater backwater control system comprises the following steps:
s1: based on the detection value of the flow sensor at the outlet of the water heater, the system state is judged,
s2: when the detection value of the flow sensor is not zero, further judging a working mode, wherein the working mode comprises a serial working mode and a heat supplementing working mode;
s21: when the detection value of the first temperature sensor is lower than that of the second temperature sensor, the water heater backwater control system enters a series working mode, the control circuit board controls the first electronic control throttle valve S1 to be closed, the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be fully opened, the water heater main body is controlled to work, and hot water flows to the outlet of the water heater through the heat accumulator;
s22: when the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water heater backwater control system enters a heat supplementing working mode, the circulating pump is started, the control circuit board controls the second electronic control throttle valve S2 to be fully opened, and the first electronic control throttle valve S1 and the third electronic control throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor to the residual flow of the water heater main body, wherein L0 is the rated flow of the water heater main body.
S3: when the detection value of the flow sensor is zero, determining a circulation mode comprising a full circulation mode and a half circulation mode according to the preset of a user;
s31: when the water heater backwater control system is in a full circulation mode, the control circuit board controls the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be closed, and the first electronic control throttle valve S1 is fully opened; and when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump and the water heater main body are started.
S32: when the water heater backwater control system is in a half-cycle mode, the control circuit board controls the first electronic control throttle valve S1 and the second electronic control throttle valve S2 to be closed, and the third electronic control throttle valve S3 is fully opened; and when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump and the water heater main body are started.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the design of the heat accumulator can realize the pumping out of the mixing pump of the recycled hot water and the fired hot water by the circulating pump and the outlet mixing pump, the temperature of the outlet of the front-end water heater is effectively improved under the condition of energy storage and constant temperature insulation of the heat accumulator, the continuous working counter-working pressure of the circulating pump caused by insufficient continuous feeding of the backflow hot water under the condition of long pipeline is avoided by the cooperation of the heat accumulator and the circulating pump, meanwhile, the working time of the circulating pump is reduced by the heating use of the outlet mixing pump in the heat accumulator, and the requirement on the heat supply durability under a long hot water main pipe is prolonged.
2. In the invention, the switching of multiple modes is realized by controlling the opening and closing of the plurality of electrically controlled throttle valves, particularly, the series working mode can quickly provide hot water, and the heat supplementing working mode can supplement heat for the heat accumulator while providing the hot water under the condition of sufficient working capacity of a main machine of the water heater so as to ensure sufficient hot water when water is used next time; the full-circulation mode is suitable for the frequent condition of water consumption, can guarantee that hot water in the pipeline is sufficient, and the half-circulation mode is suitable for when the hot water demand is lower, can only circulate the heat accumulator, utilizes the good thermal insulation performance of heat accumulator, realizes low power circulation, has avoided the heat energy extravagant.
3. According to the invention, the intelligent degree of the system is improved by switching the automatic control modes of the temperature controller.
4. According to the invention, the flow sensor is arranged, the throttle valve is controlled to be opened in proportion according to the use flow and the rated flow of the water heater, on the premise of ensuring sufficient hot water supply, the heat accumulator can be supplemented with heat by using the residual flow performance of the water heater main machine, and the energy utilization efficiency of the system is improved.
Drawings
FIG. 1 is a system block diagram of a water heater return control system according to the present invention;
FIG. 2 is a system block diagram of another embodiment of a water heater return control system according to the present invention;
fig. 3 is a schematic perspective view of a water return control system of a water heater according to the present invention.
Illustration of the drawings:
1. a circulation pump; 2. a water heater main body; 3. a hot water main pipe; 4. a main reflux pipe; 5. a heat accumulator; 6. an outlet of the water heater; 7. a three-way valve; 8. a cold water pipe; 9. a temperature intelligent regulation and control module; s1, a first electric control throttle valve; s2, a second electric control throttle valve; s3, a third electric control throttle valve; s4, a thermostatic valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Detailed description of the preferred embodiment
Referring to fig. 1 and 3, the present invention provides a technical solution: the water heater comprises a circulating pump 1, a water heater main body 2, a heat accumulator 5, a water heater outlet 6, a first electronic control throttle valve S1, a second electronic control throttle valve S2 and a third electronic control throttle valve S3, wherein a control circuit board is arranged in the water heater main body 2, a cold water inlet, a hot water outlet and a water return port are formed in the cold water inlet, the hot water outlet and the water return port are formed in the heat accumulator 5, and the heat accumulator 5 is arranged at the water heater outlet 6; a flow sensor is arranged at the outlet of the water heater;
one end of the first electronically controlled throttle valve S1 is connected to the hot water outlet of the water heater main body 2 and one end of a third electronically controlled throttle valve S3 through a tee joint, respectively, and the other end of the third electronically controlled throttle valve S3 is connected to the first port of the heat accumulator 5; the other end of the first electronic control throttle valve S1 is respectively connected to the outlet 6 of the water heater and one end of a second electronic control throttle valve S2 through a tee joint, and the other end of the second electronic control throttle valve S2 is connected to a second interface of the heat accumulator 5; the control circuit board is electrically connected to the first electrically controlled throttle valve S1, the second electrically controlled throttle valve S2, the third electrically controlled throttle valve S3 and the water heater outlet 6.
A first temperature sensor is arranged at a hot water outlet of the water heater main body (2), and a second temperature sensor is arranged inside the heat accumulator 5.
When the flow sensor detects that the outlet 6 of the water heater works and the detection value of the first temperature sensor is lower than that of the second temperature sensor, the water return control system of the water heater enters a series working mode, the control circuit board controls the first electronic control throttle valve S1 to be closed, the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be fully opened, and the water heater main body 2 is controlled to work.
When the flow sensor detects that the outlet 6 of the water heater works and the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water return control system of the water heater enters a heat supplementing working mode, the circulating pump 1 is started, the control circuit board controls the second electronic control throttle valve S2 to be fully opened, the first electronic control throttle valve S1 and the third electronic control throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor to the residual flow of the water heater body, wherein L0 is the rated flow of the water heater body 2.
The water heater return control system may be in a full cycle mode and a half cycle mode when the flow sensor does not detect operation of the water heater outlet 6, based on user settings.
When the water heater backwater control system is in a full circulation mode, the control circuit board controls the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be closed, and the first electronic control throttle valve S1 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulation pump 1 and the water heater main body 2 are started.
When the water heater backwater control system is in a half-cycle mode, the control circuit board controls the first electronic control throttle valve S1 and the second electronic control throttle valve S2 to be closed, and the third electronic control throttle valve S3 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulation pump 1 and the water heater main body 2 are started.
The control method specifically comprises the following steps:
s1: based on the detection value of the flow sensor at the outlet of the water heater, the system state is judged,
s2: when the detection value of the flow sensor is not zero, further judging a working mode, wherein the working mode comprises a serial working mode and a heat supplementing working mode;
s21: when the detection value of the first temperature sensor is lower than that of the second temperature sensor, the water heater backwater control system enters a series working mode, the control circuit board controls the first electronic control throttle valve S1 to be closed, the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be fully opened, the water heater main body 2 is controlled to work, and hot water flows to the outlet of the water heater through the heat accumulator;
s22: when the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water heater backwater control system enters a heat supplementing working mode, the circulating pump 1 is started, the control circuit board controls the second electronic control throttle valve S2 to be fully opened, and the first electronic control throttle valve S1 and the third electronic control throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor to the residual flow of the water heater main body, wherein L0 is the rated flow of the water heater main body 2.
S3: when the detection value of the flow sensor is zero, determining a circulation mode comprising a full circulation mode and a half circulation mode according to the preset of a user;
s31: when the water heater backwater control system is in a full circulation mode, the control circuit board controls the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be closed, and the first electronic control throttle valve S1 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulation pump 1 and the water heater main body 2 are started.
S32: when the water heater backwater control system is in a half-cycle mode, the control circuit board controls the first electronic control throttle valve S1 and the second electronic control throttle valve S2 to be closed, and the third electronic control throttle valve S3 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulation pump 1 and the water heater main body 2 are started.
Detailed description of the invention
Referring to fig. 2 and 3, the present invention provides another technical solution: the backwater control system of the water heater further comprises a thermostatic valve S4, a hot water inlet of the thermostatic valve S4 is connected with a first electric control throttle valve S1 and a second electric control throttle valve S2 through a tee joint, a cold water inlet is connected with a cold water pipe of the water heater main body, and a warm water outlet of the thermostatic valve S4 is connected with a water inlet of an outlet of the water heater; through setting up the thermostatic valve, improved the accuracy nature to temperature control.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A water heater return water control system comprises a circulating pump (1), a water heater main body (2), a heat accumulator (5), a water heater outlet (6), a first electric control throttle valve S1, a second electric control throttle valve S2 and a third electric control throttle valve S3, wherein a control circuit board is arranged in the water heater main body (2), and is provided with a cold water inlet, a hot water outlet and a return water port, and the water heater return water control system is characterized in that the heat accumulator (5) is arranged at the water heater outlet (6); a flow sensor is arranged at the outlet of the water heater;
one end of the first electronic control throttle valve S1 is respectively connected to a hot water outlet of the water heater main body (2) and one end of a third electronic control throttle valve S3 through a tee joint, and the other end of the third electronic control throttle valve S3 is connected to a first interface of the heat accumulator (5); the other end of the first electronic control throttle valve S1 is respectively connected to the outlet (6) of the hot water machine and one end of a second electronic control throttle valve S2 through a tee joint, and the other end of the second electronic control throttle valve S2 is connected to a second interface of the heat accumulator (5); the control circuit board is electrically connected to the first electrically controlled throttle valve S1, the second electrically controlled throttle valve S2, the third electrically controlled throttle valve S3 and the water heater outlet (6).
2. The water heater return water control assembly according to claim 1, wherein a first temperature sensor is arranged at a hot water outlet of the water heater main body (2), and a second temperature sensor is arranged inside the heat accumulator (5).
3. The water heater return water control assembly according to claim 2, wherein when the flow sensor detects that the outlet (6) of the water heater is operated and the detection value of the first temperature sensor is lower than the detection value of the second temperature sensor, the water heater return water control system enters a series operation mode, the control circuit board controls the first electronically controlled throttle valve S1 to be closed, the second electronically controlled throttle valve S2 and the third electronically controlled throttle valve S3 to be fully opened, and controls the water heater main body (2) to be operated.
4. The water heater return water control assembly according to claim 3, wherein when a flow sensor detects that the outlet (6) of the water heater is working and the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water heater return water control system enters a heat supplementing working mode, the circulating pump (1) is started, the control circuit board controls the second electronically controlled throttle valve S2 to be fully opened, and the first electronically controlled throttle valve S1 and the third electronically controlled throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor and the residual flow of the water heater main body, wherein L0 is the rated flow of the water heater main body (2).
5. The water heater return control assembly of claim 3, wherein the water heater return control system is operable in a full cycle mode and a half cycle mode when the flow sensor does not detect operation of the water heater outlet (6) based on user settings.
6. The water heater return control assembly of claim 5, wherein when the water heater return control system is in full circulation mode, the control circuit board controls the second electronically controlled throttle valve S2 and the third electronically controlled throttle valve S3 to close, and the first electronically controlled throttle valve S1 to full open; when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump (1) and the water heater main body (2) are started.
7. The water heater return control assembly of claim 5, wherein when the water heater return control system is in a half-cycle mode, the control circuit board controls the first electronically controlled throttle valve S1 and the second electronically controlled throttle valve S2 to close, and the third electronically controlled throttle valve S3 to full open; when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump (1) and the water heater main body (2) are started.
8. The control method of the water return control system of the water heater according to any one of claims 1 to 7, characterized by comprising the following steps:
s1: based on the detection value of the flow sensor at the outlet of the water heater, the system state is judged,
s2: when the detection value of the flow sensor is not zero, further judging a working mode, wherein the working mode comprises a serial working mode and a heat supplementing working mode;
s21: when the detection value of the first temperature sensor is lower than that of the second temperature sensor, the water heater backwater control system enters a series working mode, the control circuit board controls the first electronic control throttle valve S1 to be closed, the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be fully opened, the water heater main body (2) is controlled to work, and hot water flows to the outlet of the water heater through the heat accumulator;
s22: when the detection value of the first temperature sensor is higher than that of the second temperature sensor, the water heater backwater control system enters a heat supplementing working mode, the circulating pump (1) is started, the control circuit board controls the second electronic control throttle valve S2 to be fully opened, and the first electronic control throttle valve S1 and the third electronic control throttle valve S3 are proportionally opened according to the ratio L0-L1 of the detection value L1 of the flow sensor to the residual flow of the water heater main body, wherein L0 is the rated flow of the water heater main body (2).
S3: when the detection value of the flow sensor is zero, determining a circulation mode comprising a full circulation mode and a half circulation mode according to the preset of a user;
s31: when the water heater backwater control system is in a full circulation mode, the control circuit board controls the second electronic control throttle valve S2 and the third electronic control throttle valve S3 to be closed, and the first electronic control throttle valve S1 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump (1) and the water heater main body (2) are started.
S32: when the water heater backwater control system is in a half-cycle mode, the control circuit board controls the first electronic control throttle valve S1 and the second electronic control throttle valve S2 to be closed, and the third electronic control throttle valve S3 is fully opened; when the detection value of the second temperature sensor is lower than the threshold value, the circulating pump (1) and the water heater main body (2) are started.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110882069.1A CN113465188B (en) | 2021-08-02 | 2021-08-02 | Water heater backwater control system, water heater and backwater control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110882069.1A CN113465188B (en) | 2021-08-02 | 2021-08-02 | Water heater backwater control system, water heater and backwater control method thereof |
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| CN113465188B CN113465188B (en) | 2022-10-18 |
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| JP2005195211A (en) * | 2004-01-05 | 2005-07-21 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
| CN205373025U (en) * | 2016-01-07 | 2016-07-06 | 广东芬尼克兹节能设备有限公司 | Water heating system |
| CN108548208A (en) * | 2018-03-22 | 2018-09-18 | 江苏迈能高科技有限公司 | A kind of hot water cyclesystem and control method |
| CN108662781A (en) * | 2018-05-16 | 2018-10-16 | 江苏迈能高科技有限公司 | A kind of intelligent hot water circulatory system and its control method |
| CN209558683U (en) * | 2019-01-29 | 2019-10-29 | 李彦希 | It is distributed the heat storage type domestic hot-water circulatory system |
| CN112344425A (en) * | 2019-08-07 | 2021-02-09 | 青岛经济技术开发区海尔热水器有限公司 | Gas heating equipment, heating and hot water supplying system and control method thereof |
-
2021
- 2021-08-02 CN CN202110882069.1A patent/CN113465188B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005195211A (en) * | 2004-01-05 | 2005-07-21 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
| CN205373025U (en) * | 2016-01-07 | 2016-07-06 | 广东芬尼克兹节能设备有限公司 | Water heating system |
| CN108548208A (en) * | 2018-03-22 | 2018-09-18 | 江苏迈能高科技有限公司 | A kind of hot water cyclesystem and control method |
| CN108662781A (en) * | 2018-05-16 | 2018-10-16 | 江苏迈能高科技有限公司 | A kind of intelligent hot water circulatory system and its control method |
| CN209558683U (en) * | 2019-01-29 | 2019-10-29 | 李彦希 | It is distributed the heat storage type domestic hot-water circulatory system |
| CN112344425A (en) * | 2019-08-07 | 2021-02-09 | 青岛经济技术开发区海尔热水器有限公司 | Gas heating equipment, heating and hot water supplying system and control method thereof |
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| CN113465188B (en) | 2022-10-18 |
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