CN110030738B - Combustion control method of gas water heater - Google Patents
Combustion control method of gas water heater Download PDFInfo
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- CN110030738B CN110030738B CN201810026387.6A CN201810026387A CN110030738B CN 110030738 B CN110030738 B CN 110030738B CN 201810026387 A CN201810026387 A CN 201810026387A CN 110030738 B CN110030738 B CN 110030738B
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- wind pressure
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- rotating speed
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to a combustion control method of a gas water heater, wherein the gas water heater comprises a combustor, a proportional valve, a fan and a controller, and is characterized in that: the exhaust port of the gas water heater is provided with a wind pressure sensor, the wind pressure sensor is also connected with the controller, and a wind pressure reference database and a fan rotating speed compensation database are preserved in the controller in advance. Compared with the prior art, the invention has the advantages that: when the external air pressure is not generated, the detection value of the air pressure sensor of the fan at different rotating speeds is pre-stored as an air pressure reference value, the rotating speed compensation quantity required to be adjusted of the fan is also pre-stored under the condition of different reference rotating speeds, when different air pressure values exist in the external world, the influence of the air pressure generated by the fan on the detection value of the air pressure sensor can be better avoided, meanwhile, the adjustment of the rotating speed of the fan is controlled more accurately, and the control method is more accurate.
Description
Technical Field
The invention relates to a combustion control method of a gas water heater.
Background
During the use process of the household gas water heater, a plurality of uncontrollable factors are faced, such as fluctuation of water inlet flow, different purity of combustion gas, different air pressure of the combustion gas, overlarge external air pressure caused by external wind blowing and the like, and all the factors can influence the constant temperature performance of the gas water heater or cause the abnormal work of the gas water heater. The problem that the machine that wherein external wind pressure is too big causes can't normally burn and bring is increasingly outstanding, like the high-rise resident family in coastal city, the water heater air outlet often has very big wind-force, and the water heater will appear the ignition point after wind-force reaches certain intensity and stay, or is blown out scheduling problem suddenly when burning. These problems have resulted in a reduction in the environmental capabilities of domestic gas water heaters.
The working process of the conventional household gas water heater comprises the following steps: as long as it has gas and air to mix according to certain proportion and can burn the heating in the combustion chamber to guarantee during normal combustion, the air is blown to in the combustion chamber by the fan, combustible gas is delivered to in the combustion chamber by the proportional valve control, air and combustible gas mix the postcombustion in the combustion chamber, waste gas after the burning is discharged through the gas outlet at gas heater top, if external wind pressure is too big this moment, external air will flow backward in toward the combustion chamber by the air outlet, air and combustible gas's ratio change in the combustion chamber leads to the ignition point not being or the phenomenon of flameout suddenly in the burning this moment.
In order to solve the above problems, the existing gas water heater with wind resistance generally carries out the detection of the wind pressure by additionally arranging a wind pressure sensor at the air outlet of the gas water heater, when the wind pressure sensor detects the wind pressure value, the rotating speed of the fan is increased, wherein the numerical value of the increased rotating speed of the fan is in a linear relation with the magnitude of the external wind pressure data. In the gas water heater, because the installation positions of the fans are different, the modes of sending air into the combustion chamber generally comprise a blowing mode and an air suction mode; in the blowing type, most of fans are arranged below the combustor, and an air outlet of each fan is communicated with the combustion chamber and blows air into the combustion chamber of the combustor; in the air draft type, most of fans are arranged above the combustor, and an air inlet of each fan is communicated with the combustion chamber and used for exhausting air to the combustion chamber so as to enable external air to enter the combustion chamber; the control method is not accurate, particularly for the lower blowing type fan, even if no wind pressure exists outside, the wind pressure sensor can detect a certain wind pressure value because the fan operates, and in addition, the control method is not accurate because the linear relation is formed between the numerical value of the increase of the rotating speed of the fan and the magnitude of external wind pressure data, and the accurate wind resistance can not be clearly known only by the increase of the rotating speed of the fan.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a combustion control method for a gas water heater with wind resistance, which can prevent a burner from being blown out when wind pressure exists outside.
The technical scheme adopted by the invention for solving the technical problems is as follows: a combustion control method of a gas water heater, wherein the gas water heater comprises a burner with a combustion chamber, a proportional valve for controlling the amount of combustion gas entering the combustion chamber of the burner, a fan with an air outlet communicated with an air inlet of the combustion chamber and used for blowing air into the combustion chamber and controlling the amount of blown air, and a controller connected with the proportional valve and the fan, the method is characterized in that: set up wind pressure sensor in the air outlet of fan or combustion chamber inlet port department, wind pressure sensor also is connected with the controller, predetermine in the controller and preserve wind pressure benchmark database, be equipped with in this wind pressure benchmark database under the external no wind pressure condition, the wind pressure benchmark value that wind pressure sensor detected when the different rotational speeds of fan, after the ignition is successful, the controller carries out combustion control through following step:
step 1, a controller obtains a current wind pressure detection value through data measured by a wind pressure sensor in real time;
step 2, according to the actual rotating speed of the current fan, a wind pressure reference value under the actual rotating speed condition of the current fan is obtained through query by combining a wind pressure reference database;
step 3, subtracting the current wind pressure detection value obtained in the step 1 from the wind pressure reference value obtained in the step 2, if the difference value between the current wind pressure detection value and the wind pressure reference value is greater than a preset value M, controlling the fan to reduce the rotating speed by the controller, and then returning to the step 1; otherwise, entering step 4;
step 4, if the current wind pressure detection value obtained in the step 1 plus a preset value M is smaller than the wind pressure reference value obtained in the step 2, the controller controls the fan to increase the rotating speed, and then the step 1 is returned; otherwise, the controller controls the fan to continue to operate according to the current rotating speed.
Preferably, the preset value M is 13-17 Pa.
Compared with the prior art, the invention has the advantages that: when having external no wind pressure, the fan is preserved in advance as the wind pressure benchmark value at the detection value of wind pressure sensor under the different rotational speeds, and when external wind pressure appeared, wind pressure sensor's measured value can diminish, need improve the fan rotational speed this moment and resist external wind pressure, along with the slow grow of fan rotational speed increase wind pressure sensor's measured value, the fan just need not continue to compensate when returning to original no wind pressure's reference value, this kind of wind pressure sensor's when having no wind pressure benchmark value can be in order to realize the wind pressure control as the reference value of wind pressure, and the control mode is simple effective.
Drawings
Fig. 1 is a schematic structural diagram of a gas water heater in the embodiment of the invention.
FIG. 2 is a flow chart of a combustion control method of a gas water heater according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The gas water heater as shown in fig. 1 comprises a combustor 2 with a combustion chamber 1, a proportional valve 3 for controlling the amount of combustion gas entering the combustion chamber of the combustor, a fan 4 with an air outlet communicated with the combustion chamber and used for blowing air into the combustion chamber and controlling the amount of blown air, a controller (not shown in the figure) connected with the proportional valve 3 and the fan 4, a gas collecting hood 5 with an air outlet arranged above the combustor, an air outlet 6 of the gas collecting hood communicated with the outside, and an air pressure sensor 7 arranged at the air outlet of the fan 4 and also connected with the controller.
The wind pressure benchmark database is preserved in the controller in advance, and the wind pressure benchmark value that the wind pressure sensor detected when the fan was at different rotational speeds under the external no wind pressure condition is equipped with in this wind pressure benchmark database, and the wind pressure benchmark database can be surveyed in advance in the laboratory, under the no wind pressure condition in the assurance external, makes the fan be in different rotational speeds, records the wind pressure value that the wind pressure sensor measured respectively, is the wind pressure benchmark value promptly.
After the ignition is successful, the controller performs combustion control by the following steps, as shown in fig. 2:
step 1, a controller obtains a current wind pressure detection value through data measured by a wind pressure sensor in real time;
step 2, according to the actual rotating speed of the current fan, a wind pressure reference value under the actual rotating speed condition of the current fan is obtained through query by combining a wind pressure reference database;
step 3, subtracting the current wind pressure detection value obtained in the step 1 from the wind pressure reference value obtained in the step 2, if the difference value between the current wind pressure detection value and the wind pressure reference value is greater than a preset value M, controlling the fan to reduce the rotating speed by the controller, and then returning to the step 1; otherwise, entering step 4;
step 4, if the current wind pressure detection value obtained in the step 1 plus a preset value M is smaller than the wind pressure reference value obtained in the step 2, the controller controls the fan to increase the rotating speed, and then the step 1 is returned; otherwise, the controller controls the fan to continue to operate according to the current rotating speed.
In this embodiment, the preset value M is 15 Pa.
Claims (2)
1. A combustion control method of a gas water heater, wherein the gas water heater comprises a burner with a combustion chamber, a proportional valve for controlling the amount of combustion gas entering the combustion chamber of the burner, a fan with an air outlet communicated with an air inlet of the combustion chamber and used for blowing air into the combustion chamber and controlling the amount of blown air, and a controller connected with the proportional valve and the fan, the method is characterized in that: set up wind pressure sensor in the air outlet of fan or combustion chamber inlet port department, wind pressure sensor also is connected with the controller, predetermine in the controller and preserve wind pressure benchmark database, be equipped with in this wind pressure benchmark database under the external no wind pressure condition, the wind pressure benchmark value that wind pressure sensor detected when the different rotational speeds of fan, after the ignition is successful, the controller carries out combustion control through following step:
step 1, a controller obtains a current wind pressure detection value through data measured by a wind pressure sensor in real time;
step 2, according to the actual rotating speed of the current fan, a wind pressure reference value under the actual rotating speed condition of the current fan is obtained through query by combining a wind pressure reference database;
step 3, subtracting the current wind pressure detection value obtained in the step 1 from the wind pressure reference value obtained in the step 2, if the difference value between the current wind pressure detection value and the wind pressure reference value is greater than a preset value M, controlling the fan to reduce the rotating speed by the controller, and then returning to the step 1; otherwise, entering step 4;
step 4, if the current wind pressure detection value obtained in the step 1 plus a preset value M is smaller than the wind pressure reference value obtained in the step 2, the controller controls the fan to increase the rotating speed, and then the step 1 is returned; otherwise, the controller controls the fan to continue to operate according to the current rotating speed.
2. The combustion control method of a gas water heater according to claim 1, characterized in that: the preset value M is 13-17 Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810026387.6A CN110030738B (en) | 2018-01-11 | 2018-01-11 | Combustion control method of gas water heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810026387.6A CN110030738B (en) | 2018-01-11 | 2018-01-11 | Combustion control method of gas water heater |
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| CN110030738A CN110030738A (en) | 2019-07-19 |
| CN110030738B true CN110030738B (en) | 2021-05-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425744B (en) * | 2019-07-20 | 2023-11-24 | 万家乐热能科技有限公司 | Wind pressure control system and control method for full-premix gas heating water heater |
| CN110953731A (en) * | 2019-12-30 | 2020-04-03 | 重庆海尔热水器有限公司 | Wind pressure control method and device, gas water heater and storage medium |
| CN111578523B (en) * | 2020-04-30 | 2021-11-09 | 广东万和新电气股份有限公司 | Water heater wind pressure value adjusting method and device, computer equipment and storage medium |
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| JPH04155151A (en) * | 1990-10-18 | 1992-05-28 | Noritz Corp | Freezing prevention device in indoor installation, forced exhaustion type combustion apparatus |
| CN202158666U (en) * | 2011-07-07 | 2012-03-07 | 海尔集团公司 | Internal pressure feedback regulating system of gas water heater |
| CN103604207A (en) * | 2013-11-08 | 2014-02-26 | 威能(无锡)供热设备有限公司 | Gas water heating equipment with reverse air resisting capability |
| CN104729101A (en) * | 2015-01-26 | 2015-06-24 | 艾欧史密斯(中国)热水器有限公司 | Combustion control system for gas water heater or wall-hanging stove and control method thereof |
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| CN106225249A (en) * | 2016-08-31 | 2016-12-14 | 芜湖美的厨卫电器制造有限公司 | Gas heater and safety control system thereof and method |
| CN106766220A (en) * | 2016-12-20 | 2017-05-31 | 广东万家乐燃气具有限公司 | A kind of gas water heater control system of air quantity self adaptation |
| CN206504456U (en) * | 2017-02-15 | 2017-09-19 | 中山市恒乐电器有限公司 | A kind of strong drum-type fully pre-mixing gas combustion water heater |
-
2018
- 2018-01-11 CN CN201810026387.6A patent/CN110030738B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04155151A (en) * | 1990-10-18 | 1992-05-28 | Noritz Corp | Freezing prevention device in indoor installation, forced exhaustion type combustion apparatus |
| CN202158666U (en) * | 2011-07-07 | 2012-03-07 | 海尔集团公司 | Internal pressure feedback regulating system of gas water heater |
| CN103604207A (en) * | 2013-11-08 | 2014-02-26 | 威能(无锡)供热设备有限公司 | Gas water heating equipment with reverse air resisting capability |
| CN104729101A (en) * | 2015-01-26 | 2015-06-24 | 艾欧史密斯(中国)热水器有限公司 | Combustion control system for gas water heater or wall-hanging stove and control method thereof |
| CN205373066U (en) * | 2015-12-28 | 2016-07-06 | 思达文电器（深圳）有限公司 | High -efficient burning intelligence constant temperature gas heater |
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