CN111594869A - Gas water heater control method, device and system and gas water heater - Google Patents
Gas water heater control method, device and system and gas water heater Download PDFInfo
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- CN111594869A CN111594869A CN202010543148.5A CN202010543148A CN111594869A CN 111594869 A CN111594869 A CN 111594869A CN 202010543148 A CN202010543148 A CN 202010543148A CN 111594869 A CN111594869 A CN 111594869A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 266
- 238000000034 method Methods 0.000 title claims abstract description 40
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 269
- 239000001301 oxygen Substances 0.000 claims abstract description 269
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 269
- 239000007789 gas Substances 0.000 claims abstract description 199
- 238000002485 combustion reaction Methods 0.000 claims abstract description 61
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000010835 comparative analysis Methods 0.000 abstract description 9
- 239000003570 air Substances 0.000 description 82
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 20
- 239000003546 flue gas Substances 0.000 description 20
- 239000000779 smoke Substances 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003287 bathing Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- 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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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The application relates to a control method, a device and a system of a gas water heater and the gas water heater. The controller carries out comparative analysis according to the preset oxygen content parameter, and reduces a certain rotating speed of the fan according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
Description
Technical Field
The application relates to the technical field of household appliances, in particular to a gas water heater control method, device and system and a gas water heater.
Background
The gas quick water heater is a device which heats cold water by using flue gas generated by burning gas to pass through a heat exchanger, and is a widely used bathing machine. The combustion condition of the water heater is the core of designing the water heater and is a problem which is constantly researched by people.
The traditional gas water heater changes the rotating speed of a fan by detecting gas (including CO, NOx and O2) in smoke. However, it is unknown what factors cause the combustion result, specifically the combustion product, to vary in efficiency. Therefore, the air quantity is changed only by the content of each gas in the flue gas, the combustion condition is not improved enough, and the traditional gas water heater has the defect of poor combustion reliability.
Disclosure of Invention
Therefore, it is necessary to provide a method, an apparatus, a system and a gas water heater for controlling a gas water heater, in order to solve the problem of poor combustion reliability of the conventional gas water heater.
A gas water heater control method comprising: acquiring oxygen content data in air, wherein the oxygen content data is acquired and sent by an oxygen content detector which is arranged at an air inlet of a burner of a gas water heater; comparing and analyzing the oxygen content data with a preset oxygen content parameter; and when the oxygen content data is larger than the preset oxygen content parameter, controlling a fan of the gas water heater to reduce the corresponding rotating speed to operate according to the oxygen content data.
In one embodiment, after the step of controlling the fan of the gas water heater to reduce the corresponding rotation speed for operation according to the oxygen content data when the oxygen content data is greater than the preset oxygen content parameter, the method further includes: and controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
In one embodiment, after the step of comparing and analyzing the oxygen content data with a preset oxygen content parameter, the method further comprises: when the oxygen content data is smaller than the preset oxygen content parameter, controlling the fan to increase the corresponding rotating speed to operate according to the oxygen content data; detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by a user or not; and if so, controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
In one embodiment, after the step of detecting whether the outlet water temperature of the gas water heater reaches the outlet water temperature set by the user, the method further includes: if not, continuously controlling the fan to increase the corresponding rotating speed to operate according to the preset rotating speed and the oxygen content data; and when the rotating speed of the fan reaches a preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by a user, controlling the gas water heater to stop.
In one embodiment, after the step of continuously controlling the fan to operate at a higher rotation speed according to the preset rotation speed and the oxygen content data, the method further includes: and when the rotating speed of the fan does not reach the preset rotating speed, returning to the step of detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by the user.
In one embodiment, when the rotation speed of the fan reaches the preset rotation speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the method further comprises the following steps: and outputting alarm information.
A gas water heater control device comprising: the system comprises an oxygen content acquisition module, a data acquisition module and a data processing module, wherein the oxygen content acquisition module is used for acquiring oxygen content data in air, the oxygen content data is acquired and sent by an oxygen content detector, and the oxygen content detector is arranged at an air inlet of a combustor of the gas water heater; the oxygen content analysis module is used for comparing and analyzing the oxygen content data with a preset oxygen content parameter; and the fan control module is used for controlling a fan of the gas water heater to reduce the corresponding rotating speed to operate according to the oxygen content data when the oxygen content data is greater than the preset oxygen content parameter.
The utility model provides a gas heater control system, includes oxygen content detector and controller, oxygen content detector sets up in the air entrance of gas heater's combustor, the controller set up in gas heater's inside, oxygen content detector connects the controller, oxygen content detector is arranged in gathering the oxygen content data in the air and sending to the controller, the controller is used for carrying out combustion control according to foretell method.
A gas water heater comprises the gas water heater control system.
In one embodiment, the gas water heater further comprises an information prompting device, the information prompting device is arranged on the shell of the gas water heater, and the information prompting device is connected with the controller.
According to the control method, the device and the system for the gas water heater and the gas water heater, the oxygen content detector is arranged at the air inlet of the burner of the gas water heater to detect the oxygen content in the air, and the detected oxygen content data is sent to the controller. The controller carries out comparative analysis according to the preset oxygen content parameter, and reduces a certain rotating speed of the fan according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for controlling a gas water heater according to an embodiment;
FIG. 2 is a graphical illustration of the relationship between excess air ratio and combustion temperature for one embodiment;
FIG. 3 is a flow chart of a control method of a gas water heater according to another embodiment;
FIG. 4 is a flow chart of a control method of a gas water heater according to still another embodiment;
FIG. 5 is a graph of CO content and NOx content in oxygen versus air excess factor for one embodiment;
FIG. 6 is a flow chart illustrating a method for controlling a gas water heater according to yet another embodiment;
FIG. 7 is a flow chart of a method for controlling a gas water heater according to an embodiment;
FIG. 8 is a schematic structural diagram of a control device of a gas water heater according to an embodiment;
FIG. 9 is a schematic structural diagram of a control device of a gas water heater in another embodiment;
FIG. 10 is a schematic diagram of a gas water heater according to an embodiment.
Description of reference numerals: 1-an oxygen content detector, 2-a fan, 3-a heat exchanger, 4-a burner and 5-a controller.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a method for controlling a gas water heater includes steps S100, S200 and S300.
And S100, acquiring oxygen content data in the air.
Specifically, the oxygen content data is collected and transmitted by an oxygen content detector disposed at an air inlet of a burner of the gas water heater. Aiming at the defect that the traditional gas water heater fan rotating speed is mainly adjusted according to the flue gas generated by combustion, only the combustion result can be detected, and particularly, the combustion result is different and the efficiency is changed by what factors, so that the air quantity is changed by only depending on the content of each gas in the flue gas, and the combustion condition of the gas water heater cannot be substantially improved.
This application is to this problem of oxygen content influences the combustion regime in the air, starts from gas heater's source, examinesThe oxygen content in the air entering the gas water heater is measured, so that specific measures are taken for different oxygen contents, and the heat efficiency of the gas water heater is ensured while the outlet water temperature is kept. A 5L/min water heater is arranged between 1 and 15m3The fully-sealed kitchen works for example, when smoke directly deflects to indoor polluted rooms, the indoor oxygen concentration is obviously reduced, and the pollution conditions are shown in the following table:
| running time t/min of |
0 | 2.0 | 4.0 | 6.0 | 8.0 | 10.0 |
| Indoor oxygen-containing phi (O)2)/％ | 20.9 | 20.3 | 19.8 | 19.2 | 18.7 | 18.1 |
| Running time t/min of water heater | 12.0 | 14.0 | 16.0 | 18.0 | 20.0 | 22.0 |
| Indoor oxygen-containing phi (O)2)/％ | 17.5 | 17 | 16.4 | 15.9 | 15.3 | 14.8 |
As can be seen from the above table, from the 6 th min, the room is anoxic, and CO in the flue gas can obviously rise; by 18min, severe oxygen deprivation in the room can lead to flame extinction, and the room is a severely toxic environment. The existing water heater is of a forced-ventilated type, namely smoke is directly exhausted outdoors, but the oxygen content in ambient air can be changed under the influence of humidity and can also be changed due to some accidental leakage. Therefore, it is necessary to control the operation of the gas water heater by detecting the oxygen content in the air.
It should be noted that the controller may obtain the oxygen content data by actively accessing the oxygen content detector, or the oxygen content data may be sent to the controller directly after the oxygen content detector detects the oxygen content data. It will be appreciated that the type of oxygen content detector is not exclusive and in one embodiment the oxygen content detector is an oxygen sensor.
And step S200, comparing and analyzing the oxygen content data with a preset oxygen content parameter.
Specifically, after obtaining the controlled oxygen content data, the controller compares and analyzes the oxygen content data with preset oxygen content parameters prestored in the controller, so that the controller can realize corresponding control operation according to different oxygen contents in the air. It should be noted that the type of the preset oxygen content parameter is not exclusive, and may be a specific threshold, or a threshold range, and may be set differently according to the user's needs or the type of the gas water heater.
And step S300, when the oxygen content data is larger than the preset oxygen content parameter, controlling a fan of the gas water heater to reduce the corresponding rotating speed to operate according to the oxygen content data.
Specifically, in engineering thermal, the theoretical air amount means 1Nm3The dry gas is the dry air amount required when the dry gas is completely combusted according to a combustion reaction equation. The approximate value phi (O) is generally adopted in engineering thermodynamic calculation2)＝21％，φ(N2) 79 percent. On combustion plants, the actual quantity V of air supplied to the combustion of the gas is always greater than the theoretical quantity V of air, due to the specific requirements of the combustion process0The ratio of the two is called the excess air ratio α, i.e. α ═ V/V0In gas fired water heaters α typically range from 1.6 to 2.0, if low oxygen operation is used, the excess air factor α typically ranges from 1.2 to 1.4.
Referring to fig. 2, taking the combustion of natural gas as an example, the theoretical combustion temperature is T, and the curve shows that T reaches a maximum value when α is 1; in the alpha <1 region, due to insufficient air, part of fuel gas can not be combusted to emit heat, so that the temperature is reduced; in the region α >1, excess air is mixed into the high-temperature flue gas due to excess air, and the flue gas temperature is lowered. Therefore, when the controller carries out comparative analysis according to the oxygen content data and the preset oxygen content parameter, if the oxygen content in the air is too high, namely the number of oxygen content households is greater than the preset oxygen content parameter, the controller can control the rotating speed of the fan to be reduced so as to relieve the condition of excess air, further improve the combustion temperature, namely improve the heat efficiency of the gas water heater.
It should be noted that when the controller adjusts the rotational speed of the fan, the controller specifically combines the currently acquired oxygen content data to perform analysis, so as to obtain the rotational speed of the fan, which needs to be adjusted by the difference between the current oxygen content data and the preset oxygen content parameter, and finally, the fan is controlled to operate at a corresponding rotational speed. It can be understood that, in an embodiment, a database in which a corresponding relationship between the fan rotation speed to be adjusted and the oxygen content difference is pre-stored in the controller, when the controller obtains the oxygen content data, the controller performs difference analysis with a preset oxygen content parameter, and after the oxygen content difference is obtained, the controller directly performs matching analysis with the pre-stored database, so that the current fan rotation speed to be reduced can be obtained.
Referring to fig. 3, in an embodiment, after step S300, the method further includes step S400.
And step S400, controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
Specifically, after the controller analyzes that the oxygen content in the air is too high and adjusts the fan of the gas water heater by reducing the rotating speed, the final oxygen content data of the gas water heater is obtained to meet the combustion requirement of the gas water heater, and the situation of oxygen content surplus can not occur. At the moment, the gas water heater only needs to be controlled according to the outlet water temperature set by the user, so that the finally flowing hot water meets the water temperature requirement of the user. It should be noted that the specific implementation manner of controlling the gas water heater to output the corresponding hot water by the controller is not exclusive, and may be implemented by adjusting a gas proportional valve of the gas water heater, and the like.
Referring to fig. 4, in an embodiment, after step S200, the method further includes step S500, step S600, and step S700.
And S500, when the oxygen content data is smaller than the preset oxygen content parameter, controlling the fan to increase the corresponding rotating speed to operate according to the oxygen content data.
Specifically, referring to fig. 2, when the oxygen content in the air is low, the excess air coefficient α is far smaller than 1, and at this time, the combustion is insufficient, and the thermal efficiency of the corresponding gas water heater is low, which cannot meet the water demand of the user. Therefore, under the condition that the oxygen content data obtained by the controller according to the oxygen content data analysis is smaller than the preset oxygen content parameter, the controller controls the rotating speed of the fan of the gas water heater to be increased, more air enters the gas water heater, and the combustion of the gas is more sufficient.
Similarly, in an embodiment, a database of the corresponding relationship between the fan rotation speed to be adjusted and the oxygen content difference is prestored in the controller, when the controller obtains the oxygen content data, the controller performs difference analysis with the preset oxygen content parameter to obtain the oxygen content difference, and then the controller directly performs matching analysis with the prestored database to obtain the current fan rotation speed to be increased.
Step S600, detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by a user;
specifically, tests show that, when too much air is supplied to the forced-ventilated water heater, flame is separated from flame, even fire is lost, and CO in the flue gas is obviously increased, specifically, referring to fig. 5, in a graph of a variation relationship between CO (curve 1) and NOx (curve 2) in the flue gas and the air volume, it can be seen that, after the air volume is greater than a certain value, CO in the flue gas is obviously increased along with the increase of the air volume, that is, the rotation speed of the fan cannot be blindly increased, otherwise, the reverse effect is obtained.
Therefore, in this embodiment, after the rotation speed of the fan is increased according to the oxygen content data, the analysis operation of the output water temperature of the gas water heater needs to be further performed to avoid the occurrence of the blind increase of the rotation speed of the fan when the outlet water temperature of the gas water heater meets the setting of the user. The temperature data of the outlet water is collected through a temperature collector arranged on the gas water heater and is sent to the controller for analysis.
If yes, the outlet water temperature of the gas water heater meets the water demand of the user, and at this time, step S700 is executed, and the gas water heater is controlled to output corresponding hot water according to the outlet water temperature set by the user. That is to say, at this moment, the rotating speed of the fan does not need to be increased again, and only the fan needs to operate according to the current rotating speed. That is, the controller controls the gas water heater to operate in the current state, and provides hot water with the same set temperature and water temperature for a user in real time.
Further, in an embodiment, referring to fig. 6, after step S600, if the outlet water temperature of the gas water heater does not reach the outlet water temperature set by the user, the method further includes step S800 and step S900.
And step S800, continuously controlling the fan to increase the corresponding rotating speed to operate according to the preset rotating speed and the oxygen content data. And step S900, when the rotating speed of the fan reaches a preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by a user, controlling the gas water heater to stop.
Specifically, referring to fig. 7, in the present embodiment, if the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user after the fan rotation speed is adjusted according to the oxygen content data for the first time, the controller will further perform the operation of increasing the fan rotation speed. And in the process of increasing the rotating speed of the fan, comparing and analyzing the rotating speed of the fan with the preset rotating speed in real time. If the rotating speed of the fan reaches the preset rotating speed, the water outlet temperature of the gas water heater still does not reach the water outlet temperature set by the user, and at the moment, the controller can directly extinguish the fire for protection, namely, the gas water heater is controlled to stop. Through the scheme, the phenomenon that fire is lost due to the fact that the rotating speed of the fan is too large can be avoided, and the safe operation of the gas water heater is influenced.
It can be understood that, in an embodiment, when the rotation speed of the fan reaches the preset rotation speed, if the water outlet temperature of the gas water heater reaches the water outlet temperature set by the user, the controller may control the gas water heater to operate at the current critical rotation speed, or directly control the gas water heater to stop, and specifically, different settings may be performed according to the user requirements.
It should be noted that, in an embodiment, in the subsequent fan speed adjustment process, each analyzed oxygen content data is different, and the corresponding oxygen content data is detected and sent in real time by the oxygen content detector, so that the operation reliability of the gas water heater can be further ensured.
In one embodiment, after step S800, the method further comprises: and when the rotating speed of the fan does not reach the preset rotating speed, returning to the step of detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by the user.
Specifically, when the controller adjusts the rotation speed of the fan according to the oxygen content data acquired in real time, if the rotation speed of the fan does not reach the preset rotation speed yet, the operation of determining whether the outlet water temperature of the gas water heater reaches the outlet water temperature set by the user is executed once, so that when the outlet water temperature of the gas water heater reaches the outlet water temperature set by the user, the operation of increasing the rotation speed of the fan can be finished in time. And when the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the rotating speed of the fan is continuously increased.
In one embodiment, when the rotation speed of the fan reaches the preset rotation speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the method further comprises the following steps: and outputting alarm information.
Specifically, the gas water heater is provided with the information prompting device, when the rotating speed of the fan reaches the preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the controller not only directly controls the gas water heater to stop, but also outputs the prompting information through the information prompting device to inform the user of the working condition, and the user experience can be effectively improved.
According to the control method of the gas water heater, the oxygen content detector is arranged at the air inlet of the burner of the gas water heater to detect the oxygen content in the air, and the detected oxygen content data is sent to the controller. The controller carries out comparative analysis according to the preset oxygen content parameter, and reduces a certain rotating speed of the fan according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
Referring to fig. 8, a control device for a gas water heater includes: an oxygen content acquisition module 100, an oxygen content analysis module 200, and a blower control module 300.
The oxygen content acquisition module 100 is used for acquiring oxygen content data in the air; the oxygen content analysis module 200 is used for comparing and analyzing the oxygen content data with a preset oxygen content parameter; the fan control module 300 is configured to control the fan of the gas water heater to reduce the corresponding rotation speed according to the oxygen content data when the oxygen content data is greater than the preset oxygen content parameter.
Referring to fig. 9, in one embodiment, the gas water heater control device further includes a water temperature control module 400. The water temperature control module 400 is used for controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
In one embodiment, the fan control module 300 is further configured to control the fan to operate at a corresponding rotation speed according to the oxygen content data when the oxygen content data is less than the preset oxygen content parameter; detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by a user or not; when the water outlet temperature of the gas water heater reaches the water outlet temperature set by the user, controlling the gas water heater to output corresponding hot water according to the water outlet temperature set by the user.
In one embodiment, the fan control module 300 is further configured to, if the water temperature of the gas water heater does not reach the water temperature set by the user, continuously control the fan to increase the corresponding rotation speed according to the preset rotation speed and the oxygen content data; and when the rotating speed of the fan reaches the preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, controlling the gas water heater to stop.
For specific limitations of the gas water heater control device, reference may be made to the above limitations of the gas water heater control method, which are not described herein again. All or part of the modules in the gas water heater control device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
According to the gas water heater control device, the oxygen content detector is arranged at the air inlet of the burner of the gas water heater to detect the oxygen content in the air, and the detected oxygen content data is sent to the controller. The controller carries out comparative analysis according to the preset oxygen content parameter, and reduces a certain rotating speed of the fan according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
Referring to fig. 10, a control system of a gas water heater includes an oxygen content detector 1 and a controller 5, the oxygen content detector 1 is disposed at an air inlet of a burner 4 of the gas water heater, the controller 5 is disposed inside the gas water heater, the oxygen content detector 1 is connected to the controller 5, the oxygen content detector 1 is configured to collect oxygen content data in air and send the data to the controller 5, and the controller 5 is configured to perform combustion control according to the above method.
Specifically, the oxygen content data is collected and transmitted by an oxygen content detector 1, and the oxygen content detector 1 is provided at an air inlet of a burner 4 of the gas water heater. Aiming at the defect that the traditional gas water heater fan rotating speed is mainly adjusted according to the flue gas generated by combustion, only the combustion result can be detected, and particularly, the combustion result is different and the efficiency is changed by what factors, so that the air quantity is changed by only depending on the content of each gas in the flue gas, and the combustion condition of the gas water heater cannot be substantially improved.
This application is to this problem of oxygen content in the air to the combustion condition production influence, starts from gas heater's source, detects oxygen content in the air that gets into gas heater to send concrete countermeasure to different oxygen content, when can keeping leaving water temperature, guarantee gas heater's thermal efficiency. A 5L/min water heater is arranged between 1 and 15m3The fully-sealed kitchen works for example, when smoke directly deflects to indoor polluted rooms, the indoor oxygen concentration is obviously reduced, and the pollution conditions are shown in the following table:
| running time t/min of |
0 | 2.0 | 4.0 | 6.0 | 8.0 | 10.0 |
| Indoor oxygen-containing phi (O)2)/％ | 20.9 | 20.3 | 19.8 | 19.2 | 18.7 | 18.1 |
| Running time t/min of water heater | 12.0 | 14.0 | 16.0 | 18.0 | 20.0 | 22.0 |
| Indoor oxygen-containing phi (O)2)/％ | 17.5 | 17 | 16.4 | 15.9 | 15.3 | 14.8 |
As can be seen from the above table, from the 6 th min, the room is anoxic, and CO in the flue gas can obviously rise; by 18min, severe oxygen deprivation in the room can lead to flame extinction, and the room is a severely toxic environment. The existing water heater is of a forced-ventilated type, namely smoke is directly exhausted outdoors, but the oxygen content in ambient air can be changed under the influence of humidity and can also be changed due to some accidental leakage. Therefore, it is necessary to control the operation of the gas water heater by detecting the oxygen content in the air.
It should be noted that the controller 5 may acquire the oxygen content data by actively accessing the oxygen content detector 1, or the oxygen content data may be directly sent to the controller 5 after the oxygen content detector 1 detects the oxygen content data. It will be appreciated that the type of oxygen content detector 1 is not exclusive and in one embodiment the oxygen content detector 1 is an oxygen sensor.
After obtaining the controlled oxygen content data, the controller 5 will compare and analyze the oxygen content data with the preset oxygen content parameters prestored in the controller 5, so that the controller 5 can implement corresponding control operations according to different oxygen contents in the air. It should be noted that the type of the preset oxygen content parameter is not exclusive, and may be a specific threshold, or a threshold range, and may be set differently according to the user's needs or the type of the gas water heater.
In engineering thermal, the theoretical air quantity is 1Nm3The dry gas is the dry air amount required when the dry gas is completely combusted according to a combustion reaction equation. The approximate value phi (O) is generally adopted in engineering thermodynamic calculation2)＝21％，φ(N2) 79 percent. On combustion plants, the actual quantity V of air supplied to the combustion of the gas is always greater than the theoretical quantity V of air, due to the specific requirements of the combustion process0The ratio of the two is called the excess air ratio α, i.e. α ═ V/V0In gas fired water heaters α typically range from 1.6 to 2.0, if low oxygen operation is used, the excess air factor α typically ranges from 1.2 to 1.4.
Referring to fig. 2, taking the combustion of natural gas as an example, the theoretical combustion temperature is T, and the curve shows that T reaches a maximum value when α is 1; in the alpha <1 region, due to insufficient air, part of fuel gas can not be combusted to emit heat, so that the temperature is reduced; in the region α >1, excess air is mixed into the high-temperature flue gas due to excess air, and the flue gas temperature is lowered. Therefore, when the controller 5 performs comparative analysis on the oxygen content data and the preset oxygen content parameter, if the oxygen content in the air is too high, that is, the number of oxygen content users is greater than the preset oxygen content parameter, the controller 5 will control the rotation speed of the fan 2 to be reduced, so as to alleviate the condition of excess air, further improve the combustion temperature, that is, improve the thermal efficiency of the gas water heater.
In the gas water heater control system, the oxygen content detector 1 is arranged at the air inlet of the burner 4 of the gas water heater to detect the oxygen content in the air, and the detected oxygen content data is sent to the controller 5. The controller 5 performs comparative analysis according to the preset oxygen content parameter, and reduces a certain fan rotating speed according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
Referring to fig. 10, a gas water heater includes the gas water heater control system.
Specifically, the oxygen content data is collected and transmitted by an oxygen content detector 1, and the oxygen content detector 1 is provided at an air inlet of a burner 4 of the gas water heater. Aiming at the defect that the traditional gas water heater fan rotating speed is mainly adjusted according to the flue gas generated by combustion, only the combustion result can be detected, and particularly, the combustion result is different and the efficiency is changed by what factors, so that the air quantity is changed by only depending on the content of each gas in the flue gas, and the combustion condition of the gas water heater cannot be substantially improved.
This application starts from gas heater's source to this problem of oxygen content influences combustion conditions in to the air, detects oxygen content in the air that gets into gas heaterTherefore, specific measures are taken for different oxygen contents, and the heat efficiency of the gas water heater is ensured while the outlet water temperature is kept. A 5L/min water heater is arranged between 1 and 15m3The fully-sealed kitchen works for example, when smoke directly deflects to indoor polluted rooms, the indoor oxygen concentration is obviously reduced, and the pollution conditions are shown in the following table:
| running time t/min of |
0 | 2.0 | 4.0 | 6.0 | 8.0 | 10.0 |
| Indoor oxygen-containing phi (O)2)/％ | 20.9 | 20.3 | 19.8 | 19.2 | 18.7 | 18.1 |
| Running time t/min of water heater | 12.0 | 14.0 | 16.0 | 18.0 | 20.0 | 22.0 |
| Indoor oxygen-containing phi (O)2)/％ | 17.5 | 17 | 16.4 | 15.9 | 15.3 | 14.8 |
As can be seen from the above table, from the 6 th min, the room is anoxic, and CO in the flue gas can obviously rise; by 18min, severe oxygen deprivation in the room can lead to flame extinction, and the room is a severely toxic environment. The existing water heater is of a forced-ventilated type, namely smoke is directly exhausted outdoors, but the oxygen content in ambient air can be changed under the influence of humidity and can also be changed due to some accidental leakage. Therefore, it is necessary to control the operation of the gas water heater by detecting the oxygen content in the air.
It should be noted that the controller 5 may acquire the oxygen content data by actively accessing the oxygen content detector 1, or the oxygen content data may be directly sent to the controller 5 after the oxygen content detector 1 detects the oxygen content data. It will be appreciated that the type of oxygen content detector 1 is not exclusive and in one embodiment the oxygen content detector 1 is an oxygen sensor.
After obtaining the controlled oxygen content data, the controller 5 will compare and analyze the oxygen content data with the preset oxygen content parameters prestored in the controller 5, so that the controller 5 can implement corresponding control operations according to different oxygen contents in the air. It should be noted that the type of the preset oxygen content parameter is not exclusive, and may be a specific threshold, or a threshold range, and may be set differently according to the user's needs or the type of the gas water heater.
In engineering thermal, the theoretical air quantity is 1Nm3The dry gas is the dry air amount required when the dry gas is completely combusted according to a combustion reaction equation. The approximate value phi (O) is generally adopted in engineering thermodynamic calculation2)＝21％，φ(N2) 79 percent. On combustion plants, the actual quantity V of air supplied to the combustion of the gas is always greater than the theoretical quantity V of air, due to the specific requirements of the combustion process0The ratio of the two is called the excess air ratio α, i.e. α ═ V/V0In gas fired water heaters α typically range from 1.6 to 2.0, if low oxygen operation is used, the excess air factor α typically ranges from 1.2 to 1.4.
Referring to fig. 2, taking the combustion of natural gas as an example, the theoretical combustion temperature is T, and the curve shows that T reaches a maximum value when α is 1; in the alpha <1 region, due to insufficient air, part of fuel gas can not be combusted to emit heat, so that the temperature is reduced; in the region α >1, excess air is mixed into the high-temperature flue gas due to excess air, and the flue gas temperature is lowered. Therefore, when the controller 5 performs comparative analysis on the oxygen content data and the preset oxygen content parameter, if the oxygen content in the air is too high, that is, the number of oxygen content users is greater than the preset oxygen content parameter, the controller 5 will control the rotation speed of the fan to be reduced, so as to alleviate the situation of excess air, further improve the combustion temperature, that is, improve the thermal efficiency of the gas water heater.
In one embodiment, the gas water heater further comprises an information prompting device, the information prompting device is arranged on the shell of the gas water heater, and the information prompting device is connected with the controller 5 (not shown). Under the condition that the rotating speed of the fan reaches the preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the controller 5 not only directly controls the gas water heater to stop, but also the controller 5 can output prompt information through the information prompt device to inform the user of the working condition, and the user experience can be effectively improved.
In the gas water heater, the oxygen content detector 1 is arranged at the air inlet of the burner 4 of the gas water heater to detect the oxygen content in the air, and the detected oxygen content data is sent to the controller 5. The controller 5 performs comparative analysis according to the preset oxygen content parameter, and reduces a certain fan rotating speed according to the oxygen content data under the condition that the oxygen content data is larger than the preset oxygen content parameter. Through above-mentioned scheme can avoid appearing gas heater because the too high condition that leads to the thermal efficiency to reduce of oxygen content, and then follow the source, solve because the combustion efficiency that oxygen content arouses crosses the problem of low excessively, improve gas heater's combustion reliability effectively.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of controlling a gas water heater, comprising:
acquiring oxygen content data in air, wherein the oxygen content data is acquired and sent by an oxygen content detector which is arranged at an air inlet of a burner of a gas water heater;
comparing and analyzing the oxygen content data with a preset oxygen content parameter;
and when the oxygen content data is larger than the preset oxygen content parameter, controlling a fan of the gas water heater to reduce the corresponding rotating speed to operate according to the oxygen content data.
2. The method for controlling a gas water heater according to claim 1, wherein after the step of controlling the fan of the gas water heater to operate at a corresponding reduced speed according to the oxygen content data when the oxygen content data is greater than the preset oxygen content parameter, the method further comprises:
and controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
3. The gas water heater control method of claim 1, wherein said step of comparing and analyzing said oxygen content data with a predetermined oxygen content parameter is followed by the step of:
when the oxygen content data is smaller than the preset oxygen content parameter, controlling the fan to increase the corresponding rotating speed to operate according to the oxygen content data;
detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by a user or not;
and if so, controlling the gas water heater to output corresponding hot water according to the outlet water temperature set by the user.
4. The gas water heater control method according to claim 3, wherein after the step of detecting whether the outlet water temperature of the gas water heater reaches the outlet water temperature set by the user, the method further comprises:
if not, continuously controlling the fan to increase the corresponding rotating speed to operate according to the preset rotating speed and the oxygen content data;
and when the rotating speed of the fan reaches a preset rotating speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by a user, controlling the gas water heater to stop.
5. The method for controlling a gas water heater according to claim 4, wherein after the step of continuing to control the fan to run at an increased speed according to the preset speed and the oxygen content data, the method further comprises:
and when the rotating speed of the fan does not reach the preset rotating speed, returning to the step of detecting whether the water outlet temperature of the gas water heater reaches the water outlet temperature set by the user.
6. The gas water heater control method according to claim 4, wherein when the rotation speed of the fan reaches a preset rotation speed and the water outlet temperature of the gas water heater does not reach the water outlet temperature set by the user, the method further comprises the following steps: and outputting alarm information.
7. A gas water heater control device, comprising:
the system comprises an oxygen content acquisition module, a data acquisition module and a data processing module, wherein the oxygen content acquisition module is used for acquiring oxygen content data in air, the oxygen content data is acquired and sent by an oxygen content detector, and the oxygen content detector is arranged at an air inlet of a combustor of the gas water heater;
the oxygen content analysis module is used for comparing and analyzing the oxygen content data with a preset oxygen content parameter;
and the fan control module is used for controlling a fan of the gas water heater to reduce the corresponding rotating speed to operate according to the oxygen content data when the oxygen content data is greater than the preset oxygen content parameter.
8. A control system of a gas water heater is characterized by comprising an oxygen content detector and a controller, wherein the oxygen content detector is arranged at an air inlet of a burner of the gas water heater, the controller is arranged in the gas water heater, the oxygen content detector is connected with the controller,
the oxygen content detector is used for collecting oxygen content data in air and sending the oxygen content data to the controller, and the controller is used for carrying out combustion control according to the method of any one of claims 1-6.
9. A gas water heater comprising the gas water heater control system of claim 8.
10. The gas water heater of claim 9, further comprising an information prompting device disposed on the gas water heater housing, the information prompting device being connected to the controller.
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