CN107965917B - Control method of gas water heater - Google Patents
Control method of gas water heater Download PDFInfo
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- CN107965917B CN107965917B CN201710243385.8A CN201710243385A CN107965917B CN 107965917 B CN107965917 B CN 107965917B CN 201710243385 A CN201710243385 A CN 201710243385A CN 107965917 B CN107965917 B CN 107965917B
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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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
- Control Of Combustion (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The invention relates to a control method of a gas water heater, when the gas water heater detects water flow, the actual load of the gas water heater is calculated according to the detected water flow value, and then the work execution component of the gas water heater is controlled according to the actual load of the gas water heater, which is characterized in that: the actual load of the gas water heater is obtained by calculating the following modes: q ═ (set temperature-influent water temperature) water flow rate "; the water flow rate is a long-term filtering value, a medium-term filtering value and a short-term filtering value. Compared with the prior art, when the actual load of the gas water heater is calculated, the short-term filter value is compared with the medium-term filter value and the long-term filter value ceaselessly according to the detected water flow condition, the change degree of the current water flow is judged according to errors, whether the water flow is stable, or the water flow shakes occasionally, or the water flow fluctuates ceaselessly is judged, and then the three states are switched to meet the temperature control requirements of different periods.
Description
Technical Field
The invention relates to a control method of a gas water heater.
Background
In actual use, the domestic gas water heater can generate the condition that the outlet water temperature cannot be stable due to the fact that the household water flow of a user fluctuates continuously. The control logic of the existing gas water heater is as follows: the method comprises the steps of firstly calculating the actual load of the gas water heater according to the following formula, wherein Q is (set temperature-inlet water temperature) water flow, wherein Q is the actual load of the gas water heater, and then controlling the work execution components of the gas water heater according to the actual load of the gas water heater, wherein the work execution components of the gas water heater comprise a gas proportional valve, a fan rotating speed and the like. In the formula, Q is changed ceaselessly due to the ceaseless change of water flow, the change of Q can influence the judgment of the combustion section position of the gas water heater, and when the Q is changed, the rotating speed of the fan is changed; if the water flow change amplitude is just at the cut-off point, the electromagnetic valve can be switched back and forth continuously, and the rotating speed of the fan is also suddenly increased or decreased along with the change of the water flow; under extreme conditions, the fan can frequently change back and forth at maximum rotational speed and minimum rotational speed, and the gas valve can snap and switch for a whole incessantly to lead to leaving water temperature to change back and forth, still appear flameout state even better.
Disclosure of Invention
The invention aims to solve the technical problem of improving a control method of a gas water heater aiming at the prior art, and the control method can ensure that the outlet water temperature is relatively constant when the water flow of a user is occasionally fluctuated or even frequently fluctuated.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a control method of a gas water heater, when the gas water heater detects water flow, the actual load of the gas water heater is calculated according to the detected water flow value, and then the work execution component of the gas water heater is controlled according to the actual load of the gas water heater, characterized in that: the actual load of the gas water heater is obtained by calculating the following modes:
q ═ water flow (set temperature-inlet water temperature) "
Wherein, Q is the actual load of the gas water heater, and the value of the water flow is divided into the following three states:
the water flow rate is equal to a long-term filtering value, and the long-term filtering value is an average value of water flows actually detected in the previous T1 time of the current time;
the water flow rate is equal to a medium-term filter value, and the medium-term filter value is an average value of water flows actually detected in the previous T2 time of the current time;
the water flow rate is equal to a short-term filter value, and the short-term filter value is an average value of water flows actually detected in the previous T3 time from the current time; wherein T1> T2> T3;
comparing the short-term filter value with the medium-term filter value and the long-term filter value continuously, firstly, judging whether the short-term filter value is more than or equal to the long-term filter value-1L/min and less than or equal to the long-term filter value +1L/min, if so, determining that the water flow rate is equal to the long-term filter value; if not, judging whether the short-term filter value is more than or equal to the medium-term filter value-1L/min and less than or equal to the medium-term filter value +1L/min, if so, determining the water flow rate as the medium-term filter value, and if not, determining the water flow rate as the short-term filter value.
As an improvement, the initial values of the long-term filtered value, the medium-term filtered value and the short-term filtered value are preset values.
The improvement is carried out, wherein the value range of T1 is 1-3 minutes; the value range of T2 is 15-30 seconds; the value range of T3 is 1-5 seconds.
Compared with the prior art, the invention has the advantages that: when calculating gas heater's actual load, can be according to the discharge condition that detects, incessantly compare short-term filter value with middle term filter value and long-term filter value, judge the degree of change of present discharge according to the error, judge that discharge is steady, still shake occasionally, still incessantly fluctuate, then open at three kinds of states and switch to satisfy the temperature control requirement in different periods, this control method can not make gas proportional valve frequently switch, also can not lead to leaving water temperature frequent change, the flameout state more can not appear.
Drawings
Fig. 1 is a flow chart of a control method of a gas water heater in the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the present invention provides a control method of a gas water heater, when the gas water heater detects that there is water flow, calculating an actual load of the gas water heater according to a detected water flow value, and then controlling a work execution component of the gas water heater according to the actual load of the gas water heater, wherein the actual load of the gas water heater is obtained by calculating:
q ═ water flow (set temperature-inlet water temperature) "
Wherein, Q is the actual load of the gas water heater, and the value of the water flow is divided into the following three states:
the water flow rate is equal to a long-term filtering value, and the long-term filtering value is an average value of water flows actually detected in the previous T1 time of the current time;
the water flow rate is equal to a medium-term filter value, and the medium-term filter value is an average value of water flows actually detected in the previous T2 time of the current time;
the water flow rate is equal to a short-term filter value, and the short-term filter value is an average value of water flows actually detected in the previous T3 time from the current time; wherein T1> T2> T3;
comparing the short-term filter value with the medium-term filter value and the long-term filter value continuously, firstly, judging whether the short-term filter value is more than or equal to the long-term filter value-1L/min and less than or equal to the long-term filter value +1L/min, if so, determining that the water flow rate is equal to the long-term filter value; if not, judging whether the short-term filter value is more than or equal to the medium-term filter value-1L/min and less than or equal to the medium-term filter value +1L/min, if so, determining the water flow rate as the medium-term filter value, and if not, determining the water flow rate as the short-term filter value.
The initial values of the long-term filtering value, the medium-term filtering value and the short-term filtering value are preset values; the value range of T1 is 1-3 minutes, preferably 2 minutes; the value range of T2 is 15-30 seconds, preferably 20 seconds; the value range of T3 is 1-10 seconds, preferably 2 seconds, 3 seconds or 5 seconds.
Claims (3)
1. A control method of a gas water heater, when the gas water heater detects water flow, the actual load of the gas water heater is calculated according to the detected water flow value, and then the work execution component of the gas water heater is controlled according to the actual load of the gas water heater, characterized in that: the actual load of the gas water heater is obtained by calculating the following modes:
q ═ water flow (set temperature-inlet water temperature) "
Wherein, Q is the actual load of the gas water heater, and the value of the water flow is divided into the following three states:
the water flow rate is equal to a long-term filtering value, and the long-term filtering value is an average value of water flows actually detected in the previous T1 time of the current time;
the water flow rate is equal to a medium-term filter value, and the medium-term filter value is an average value of water flows actually detected in the previous T2 time of the current time;
the water flow rate is equal to a short-term filter value, and the short-term filter value is an average value of water flows actually detected in the previous T3 time from the current time; wherein T1> T2> T3;
comparing the short-term filter value with the medium-term filter value and the long-term filter value continuously, firstly, judging whether the short-term filter value is more than or equal to the long-term filter value-1L/min and less than or equal to the long-term filter value +1L/min, if so, determining that the water flow rate is equal to the long-term filter value; if not, judging whether the short-term filter value is more than or equal to the medium-term filter value-1L/min and less than or equal to the medium-term filter value +1L/min, if so, determining the water flow rate as the medium-term filter value, and if not, determining the water flow rate as the short-term filter value.
2. The control method of a gas water heater according to claim 1, characterized in that: the initial values of the long-term filtering value, the medium-term filtering value and the short-term filtering value are preset values.
3. The control method of a gas water heater according to claim 1, characterized in that: the value range of T1 is 1-3 minutes; the value range of T2 is 15-30 seconds; the value range of T3 is 1-5 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710243385.8A CN107965917B (en) | 2017-04-14 | 2017-04-14 | Control method of gas water heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710243385.8A CN107965917B (en) | 2017-04-14 | 2017-04-14 | Control method of gas water heater |
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| CN107965917A CN107965917A (en) | 2018-04-27 |
| CN107965917B true CN107965917B (en) | 2021-05-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542215A (en) * | 2018-05-28 | 2019-12-06 | 宁波方太厨具有限公司 | control method of water heater |
| CN110940094B (en) * | 2018-09-25 | 2022-10-18 | 青岛经济技术开发区海尔热水器有限公司 | Gas water heater control method and gas water heater |
| CN109631344B (en) * | 2018-11-14 | 2024-01-02 | 广东万和新电气股份有限公司 | Multi-air-source self-adaptive adjustment method, control system and gas water heater with same |
| CN110953728A (en) * | 2019-12-16 | 2020-04-03 | 华帝股份有限公司 | Constant temperature control method of gas water heater |
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| CN2553296Y (en) * | 2002-05-16 | 2003-05-28 | 潘兆铿 | Gas water heater for central hot water supply |
| CN102563886A (en) * | 2012-01-06 | 2012-07-11 | 广东万家乐燃气具有限公司 | Adaptive gas water heater, system thereof and method for automatically judging gas types |
| CN104359226A (en) * | 2014-11-04 | 2015-02-18 | 广东万和新电气股份有限公司 | Method for computing gas consumption of gas appliance |
| CN104676902A (en) * | 2015-03-11 | 2015-06-03 | 广东美的暖通设备有限公司 | Heat pump water heater and control method thereof |
| CN104819557A (en) * | 2015-05-06 | 2015-08-05 | 芜湖美的厨卫电器制造有限公司 | Domestic hot water system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3872901B2 (en) * | 1998-08-05 | 2007-01-24 | 株式会社ガスター | One can multi-channel water heater |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2553296Y (en) * | 2002-05-16 | 2003-05-28 | 潘兆铿 | Gas water heater for central hot water supply |
| CN102563886A (en) * | 2012-01-06 | 2012-07-11 | 广东万家乐燃气具有限公司 | Adaptive gas water heater, system thereof and method for automatically judging gas types |
| CN104359226A (en) * | 2014-11-04 | 2015-02-18 | 广东万和新电气股份有限公司 | Method for computing gas consumption of gas appliance |
| CN104676902A (en) * | 2015-03-11 | 2015-06-03 | 广东美的暖通设备有限公司 | Heat pump water heater and control method thereof |
| CN104819557A (en) * | 2015-05-06 | 2015-08-05 | 芜湖美的厨卫电器制造有限公司 | Domestic hot water system |
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| CN107965917A (en) | 2018-04-27 |
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