CN111947315A - Fully-premixed gas water heater and control method thereof - Google Patents
Fully-premixed gas water heater and control method thereof Download PDFInfo
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- CN111947315A CN111947315A CN202010806927.XA CN202010806927A CN111947315A CN 111947315 A CN111947315 A CN 111947315A CN 202010806927 A CN202010806927 A CN 202010806927A CN 111947315 A CN111947315 A CN 111947315A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 156
- 239000007789 gas Substances 0.000 claims abstract description 145
- 238000002485 combustion reaction Methods 0.000 claims abstract description 94
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 78
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 78
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 73
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 73
- 239000001301 oxygen Substances 0.000 claims abstract description 73
- 239000000446 fuel Substances 0.000 claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 239000000779 smoke Substances 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims 2
- 230000008859 change Effects 0.000 abstract description 14
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 239000002737 fuel gas Substances 0.000 description 10
- 230000010355 oscillation Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- -1 hydrocarbon alkane Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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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
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- 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
- F24H9/0005—Details for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a full-premix gas water heater and a control method thereof, the full-premix gas water heater comprises a combustion assembly, a premix assembly, a control assembly, a gas detection assembly and an air flow adjusting assembly, wherein the premix assembly is communicated with the combustion assembly, the gas detection assembly is used for detecting the content of carbon dioxide and/or oxygen in combustion products of the combustion assembly and transmitting the content value to the control assembly, the air flow adjusting assembly is connected with the premix assembly and used for adjusting the flow area of air entering the premix assembly, and the control assembly is used for adjusting the air flow adjusting assembly according to the received content so as to adjust the proportion of air and gas in the premix assembly. According to the invention, the gas detection assembly, the control assembly and the air flow adjusting assembly are arranged, and the air flow area is adjusted according to the content of carbon dioxide or oxygen in combustion products, so that the air-fuel ratio of the gas water heater in the optimal combustion state is maintained, and the problem of abnormal combustion caused by the change of gas components is effectively solved.
Description
Technical Field
The invention belongs to the technical field of gas water heaters, and particularly relates to a full-premix gas water heater and a control method thereof.
Background
The gas water heater is equipment which takes gas as fuel and quickly prepares hot water through gas combustion; the fully premixed gas water heater is one of gas water heaters, specifically, before the water heater burns, gas and air are completely mixed and then burn, no secondary air participates in the burning process, and the gas water heater using the burning mode is a fully premixed gas water heater.
The fully premixed gas water heater has high requirements on the premixing proportion of gas and air due to the requirements on combustion characteristics, and the air coefficient is generally controlled to be about 1.2-1.35. The existing low-power (below 50 KW) full-premix gas water heater generally adopts an air-fuel proportional valve structure, the load of the full-premix gas water heater is adjusted by means of a full-premix fan with a Venturi under the negative pressure generated at the rear end of the gas of the air-fuel proportional valve, the larger the rotating speed of the fan is, the larger the generated negative pressure is, the larger the opening degree of the air-fuel proportional valve is, and the larger the load is; otherwise, the size becomes smaller. The ratio of air to gas (i.e., air-fuel ratio) is fixed.
However, the prior art has the following disadvantages: when the gas components change, the air-fuel ratio of the fully premixed combustion changes, the combustion is abnormal, the problems of combustion scream, combustion oscillation and the like can be caused, the use of a user is seriously influenced, and the combustion products CO or NO caused by incomplete combustion can be generated XThe standard exceeding not only affects the safety of users, but also causes environmental pollution.
Disclosure of Invention
In view of the above, the present invention provides a fully premixed gas water heater, which effectively solves the problem of abnormal combustion caused by the change of gas components by providing a gas detection assembly, a control assembly and an air flow regulating assembly.
Another object of the present invention is to provide a control method applied to the above-mentioned fully premixed gas water heater, which can ensure the ratio of gas and air in the fully premixed gas water heater by adjusting the air flow adjusting assembly according to the relation between the real-time content of carbon dioxide and/or oxygen in the combustion products and the preset threshold value.
The technical scheme includes that the full-premixing gas water heater comprises a combustion assembly, a premixing assembly, a control assembly, a gas detection assembly and an air flow adjusting assembly, wherein the premixing assembly is communicated with the combustion assembly, the gas detection assembly is arranged outside the combustion assembly and used for detecting the content of carbon dioxide and/or oxygen in combustion products of the combustion assembly and transmitting the content value to the control assembly, the air flow adjusting assembly is connected with the premixing assembly and used for adjusting the flow area of air entering the premixing assembly, and the control assembly is used for adjusting the air flow adjusting assembly according to the received content of the carbon dioxide and/or the oxygen so as to adjust the proportion of the air and the gas in the premixing assembly.
Preferably, the air flow regulating assembly comprises an air valve and a valve control mechanism for controlling the air valve, and the valve control mechanism is electrically connected with the air valve and the control assembly.
Preferably, the valve control mechanism comprises a stepper motor.
Preferably, the premixing component comprises a premixer, a full premixing fan and an air-fuel ratio valve, the premixer is arranged at an air inlet of the full premixing fan, the air flow adjusting component is connected with the premixer, the air-fuel ratio valve is connected with the premixer and is used for adjusting the gas input quantity entering the premixer, and the full premixing fan and the air-fuel ratio valve are electrically connected with the control component.
Preferably, the premixing assembly further comprises a gas passage connected with a gas source, and the air-fuel ratio valve is arranged on the gas passage.
Preferably, the combustion assembly further comprises a heat exchange assembly connected with the combustion assembly, the heat exchange assembly comprises a heat exchange cavity, a heat exchanger, a cold water inlet and a hot water outlet, the cold water inlet and the hot water outlet are respectively arranged at two sides of the heat exchange cavity, and the heat exchanger is arranged in the heat exchange cavity.
Preferably, the gas detection device further comprises a smoke collecting hood arranged at one end of the heat exchange assembly, and the detection end of the gas detection assembly is inserted into the smoke collecting hood.
Preferably, the smoke exhaust device further comprises a smoke exhaust pipe communicated with the side face of the smoke collecting hood.
The invention also provides a control method applied to the fully premixed gas water heater, which comprises the following steps:
s1, starting the gas water heater, and collecting the real-time content of carbon dioxide and/or oxygen in the combustion products of the combustion assembly;
s2, adjusting the air flow adjusting component according to the relation between the real-time content of the carbon dioxide or the oxygen and the preset threshold value of the carbon dioxide or the oxygen.
Preferably, in S2, the air flow adjusting component is adjusted according to the relationship between the real-time content of carbon dioxide or oxygen and a preset threshold of carbon dioxide or oxygen, specifically:
judging whether the real-time content of the carbon dioxide or the oxygen is equal to a preset threshold value of the carbon dioxide or the oxygen;
if yes, continuing combustion, namely maintaining the initial position of the air valve;
and otherwise, adjusting the opening degree of the air valve, namely changing the area of the air circulation channel.
Specifically, when the real-time content of the carbon dioxide is greater than a preset threshold of the carbon dioxide or the real-time content of the oxygen is less than a preset threshold of the oxygen, the opening of the air valve is increased;
And when the real-time content of the carbon dioxide is smaller than the preset threshold of the carbon dioxide or the real-time content of the oxygen is larger than the preset threshold of the oxygen, the opening degree of the air valve is reduced.
The invention has the beneficial effects that: according to the invention, the gas detection assembly, the control assembly and the air flow adjusting assembly are arranged, the gas detection assembly can detect the content of carbon dioxide and/or oxygen in a combustion product and transmit the content to the control assembly, the control assembly can determine whether the proportion of gas and air changes according to the comparison relation between the received content value and the preset threshold value of the content, and correspondingly control the air flow adjusting assembly, namely control the flow area of air entering the premixing assembly, so that the proportion of air and gas in the premixing assembly is adjusted, namely the air-fuel ratio is adjusted, and the air-fuel ratio of combustion is ensured not to change;
the invention ensures that the full-premix gas water heater keeps a certain air-fuel ratio for combustion by automatically identifying the change of the air-fuel ratio and automatically adaptively adjusting the air-fuel ratio, thereby ensuring the combustion working condition, avoiding the problems of combustion scream, combustion oscillation and the like, and effectively solving the problem of abnormal combustion caused by the change of the gas components of the full-premix gas water heater.
Drawings
Fig. 1 is a structural diagram of a fully premixed gas water heater provided in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of the premix assembly and the air flow adjusting assembly of the fully premixed gas water heater provided in embodiment 1 of the present invention;
fig. 3 is a flowchart of a control method of a fully premixed gas water heater according to embodiment 2 of the present invention;
fig. 4 is a specific flowchart of a control method of a fully premixed gas water heater according to embodiment 2 of the present invention.
In the figure: 1. a combustion assembly; 2. a premix assembly; 21. a premixer; 22. a fully premixed fan; 23. an air-fuel ratio valve; 24. a gas channel; 3. a control component; 4. a gas detection assembly; 5. an air flow regulating assembly; 51. an air valve; 52. a valve control mechanism; 6. a heat exchange assembly; 61. a heat exchange cavity; 62. a cold water inlet; 63. a hot water outlet; 7. a smoke collecting hood; 8. a smoke exhaust pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a fully premixed gas water heater, as shown in fig. 1, a fully premixed gas water heater comprises a combustion assembly 1, a premixing assembly 2, a control assembly 3, a gas detection assembly 4 and an air flow adjusting assembly 5, the premixing component 2 is communicated with the combustion component 1, the gas detection component 4 is arranged outside the combustion component 1, for detecting the carbon dioxide and/or oxygen content of the combustion products of said combustion assembly 1, and transmits the content value to the control component 3, the air flow regulating component 5 is connected with the premixing component 2, for regulating the flow area of the air entering the pre-mixing assembly 2, and the control assembly 3 is adapted to regulate the air flow regulating assembly 5 in accordance with the received carbon dioxide and/or oxygen content, so as to regulate the ratio of air and gas inside the pre-mixing assembly 2.
Thus, by arranging the gas detection assembly 4, the control assembly 3 and the air flow adjusting assembly 5, the gas detection assembly 4 detects the content of carbon dioxide or oxygen in the combustion product of the combustion assembly 1 in real time, and transmits the detected content value of carbon dioxide and/or oxygen to the control assembly 3, after receiving the content value of carbon dioxide and/or oxygen, the control assembly 3 compares the content value with the preset threshold value of carbon dioxide or oxygen, and adjusts the air flow adjusting assembly 5 according to the comparison result, namely adjusts the flow area of air entering the premixing assembly 2, so as to adjust the ratio of air and gas in the premixing assembly 2, and the ratio of air and gas in the premixing assembly 2 is always kept at the preset value, namely the air-fuel ratio when the gas water heater is combusted in the optimal state.
In specific implementation, the ratio of air and gas, i.e. the air-fuel ratio, of the fully premixed gas water heater is fixed, i.e. the preset value of the air-fuel ratio. When the components of the fuel gas change, the air-fuel ratio of the fully premixed combustion changes, and the combustion is abnormal, so that the use of a user is influenced, and the environmental pollution is caused; in the embodiment, the gas detection assembly 4, the control assembly 3 and the air flow adjusting assembly 5 are used in a matched manner, so that the change of the air-fuel ratio can be automatically identified, the air-fuel ratio can be automatically adapted and adjusted, the fully premixed gas water heater can be combusted by keeping the preset optimal air-fuel ratio, and the combustion condition is ensured.
In particular implementations, the gas detection assembly 4 may be a carbon dioxide sensor and/or an oxygen sensor.
As shown in fig. 2, the air flow regulating assembly 5 includes an air valve 51 and a valve control mechanism 52 for controlling the air valve 51, and the valve control mechanism 52 is electrically connected to both the air valve 51 and the control assembly 3.
The valve control mechanism 52 includes a stepping motor, and the number of steps of the stepping motor matches with the opening of the air valve 51.
In this way, the opening of the air valve 51 is adjusted by controlling the stepping motor, so as to adjust the area through which air flows, that is, the area of the air passage into the premixing assembly 2, and thus adjust the ratio of air to gas in the premixing assembly 2, that is, the air-fuel ratio.
In specific implementation, the ratio of air and gas of the fully premixed gas water heater, namely the air-fuel ratio, satisfies formula (I):
wherein beta is the air-fuel ratio, Ka is the air flow channel resistance coefficient, Aa is the air channel flow area, Kg is the gas channel resistance coefficient, Ag is the gas channel flow area, ζtIs the local resistance coefficient of the air-fuel proportional valve, rhogThe density of the fuel gas is shown, and At is the flow area of the air-fuel proportional valve;
based on the formula (I), in combination with the fully premixed gas water heater of the embodiment, when the fully premixed gas water heater of the embodiment leaves the factory, Ka, Kg, Ag, ζtAt has been determined when the gas composition changes, i.e. ρgAlso varies, pgThe larger the air-fuel ratio, the smaller the air-fuel ratio. Meanwhile, the air flow rate adjusting assembly 5 of the present embodiment can adjust the magnitude of Aa, as Aa becomes larger, the air-fuel ratio becomes larger,aa becomes smaller, the air-fuel ratio becomes smaller. So when the gas composition changes (i.e.. rho.)gChanged), the air-fuel ratio is guaranteed to be kept at a preset value by simultaneously adjusting the size of Aa in a matching manner.
As shown in fig. 2, the premixing component 2 includes a premixer 21, a full premixing blower 22 and an air-fuel ratio valve 23, the premixer 21 is disposed at an air inlet of the full premixing blower 22, the air flow adjusting component 5 is connected to the premixer 21, the air-fuel ratio valve 23 is connected to the premixer 21 and is configured to adjust an input amount of gas entering the premixer 21, and the full premixing blower 22 and the air-fuel ratio valve 23 are both electrically connected to the control component 3.
Preferably, the premixing assembly 2 further comprises a gas passage 24 connected to a gas source, and the air-fuel ratio valve 23 is disposed on the gas passage 24.
In a specific implementation, the premixer 21 is a venturi premixer. Thus, the structure of the air-fuel proportional valve 23 is adopted, the negative pressure generated at the rear end of the fuel gas of the air-fuel proportional valve 23 is used for adjusting the load of the fully premixed gas water heater by means of the full premixed fan 22 with a venturi, the larger the rotating speed of the full premixed fan 22 is, the larger the generated negative pressure is, the larger the opening degree of the air-fuel proportional valve 23 is, and the larger the load is; otherwise, the size becomes smaller.
Specifically, the premixer 21, that is, the venturi premixer, is installed at an air inlet of the full premixing fan 22, the other end of the premixer 21 is connected to a gas source through a gas channel 24, that is, connected to a gas flow distribution device, and the air inlet of the venturi premixer 21 is provided with an air flow rate adjusting assembly 5.
As shown in fig. 1, the fully premixed gas water heater further comprises a heat exchange assembly 6 connected with the combustion assembly 1, wherein the heat exchange assembly 6 comprises a heat exchange cavity 61, a heat exchanger, a cold water inlet 62 and a hot water outlet 63, the cold water inlet 62 and the hot water outlet 63 are respectively arranged at two sides of the heat exchange cavity 61, and the heat exchanger is arranged in the heat exchange cavity 61.
Therefore, cold water enters the heat exchange cavity 61 through the cold water inlet 62, is heated under the action of the combustion assembly 1, then exchanges heat through the heat exchanger, and finally is discharged from the hot water outlet 63 for use by a user, and the whole process is simple and easy to realize.
In order to perform specified emission on the exhaust gas after combustion, the exhaust gas purifier further comprises a smoke collecting hood 7 arranged at one end of the heat exchange assembly 6, and the detection end of the gas detection assembly 4 is inserted in the smoke collecting hood 7.
Wherein, still including the intercommunication set up in smoke pipe 8 of the side of collection petticoat pipe 7.
Therefore, waste gas generated after combustion of the combustion assembly 1 enters the smoke collecting hood 7 and is discharged through the smoke exhaust pipe 8, and the condition that combustion products drift everywhere to influence the environment is avoided;
meanwhile, the detection end of the gas detection assembly 4 is inserted into the smoke collection hood 7, so that the detection end of the gas detection assembly 4 can detect the content of carbon dioxide or oxygen in the exhaust gas in the smoke collection hood 7.
The working process is as follows: when the fully premixed gas water heater of the embodiment is used, the combustion assembly 1 combusts mixed gas and air, the gas detection assembly 4 detects the content of carbon dioxide or oxygen in a combustion product of the combustion assembly 1 in real time, and transmits a detected content value of carbon dioxide or oxygen to the control assembly 3, after receiving the content value of carbon dioxide or oxygen, the control assembly 3 compares the content value with a preset threshold value of carbon dioxide or oxygen, when the content of carbon dioxide or oxygen is different from the preset threshold value, the density of the gas is changed, at this time, the control assembly 3 correspondingly adjusts the air flow adjusting assembly 5 according to a comparison result, namely, the opening degree of the air valve 51 is adjusted through the valve control mechanism 52, so as to adjust the flow area of air entering the premixing assembly 2, adjust the proportion of air and gas in the premixer 21, and keep the proportion of air and gas in the premixer 21 at the preset value all the time, namely, the air-fuel ratio of the gas water heater during combustion is maintained in the optimal state.
In the embodiment, by arranging the gas detection assembly, the control assembly and the air flow adjusting assembly, the gas detection assembly can detect the content of carbon dioxide or oxygen in a combustion product and transmit the content to the control assembly, the control assembly can determine whether the proportion of gas and air changes according to the comparison relationship between the received content value and the preset threshold value of the content, and correspondingly control the air flow adjusting assembly, namely control the flow area of air entering the premixing assembly, so that the proportion of air and gas in the premixing assembly is adjusted, namely the air-fuel ratio is adjusted, and the air-fuel ratio of combustion is ensured not to change;
according to the embodiment, the change of the air-fuel ratio is automatically identified, and the air-fuel ratio is automatically adapted and adjusted, so that the full-premix gas water heater keeps a certain air-fuel ratio for combustion, the combustion working condition is ensured, the problems of combustion scream, combustion oscillation and the like are avoided, and the problem of abnormal combustion caused by the change of gas components of the full-premix gas water heater is effectively solved.
Example 2
The present embodiment provides a control method applied to the fully premixed gas water heater of embodiment 1, as shown in fig. 3, the control method includes the following steps:
s1, starting the gas water heater, and collecting the real-time content of carbon dioxide or oxygen in the combustion products of the combustion assembly;
Specifically, the main component of the fuel gas is hydrocarbon alkane, the combustion product generated after the fuel gas is mixed with air and combusted contains water vapor and carbon dioxide, if the air content is excessive, the combustion product contains excessive air, the oxygen content in the combustion product is relatively increased, the carbon dioxide content in the combustion product is relatively reduced, and conversely, the oxygen content in the combustion product is increased, and the carbon dioxide content in the combustion product is reduced; therefore, the content of carbon dioxide or oxygen in the combustion product is collected through the gas detection assembly 4, and the current ratio of air to fuel gas can be completely reflected;
in specific implementation, the air-fuel ratio of the gas water heater during working under the condition of standard gas is preset when the gas water heater leaves a factory, the content of oxygen or carbon dioxide in a combustion product corresponding to the air-fuel ratio during working, namely a preset threshold value of the oxygen or carbon dioxide, and the initial position of the air valve corresponding to the air-fuel ratio are preset;
s2, adjusting the air flow adjusting component according to the relation between the real-time content of the carbon dioxide or the oxygen and the preset threshold value of the carbon dioxide or the oxygen.
Specifically, if the density of the fuel gas is constant, that is, the mixing ratio of the fuel gas and the air is constant, that is, the air-fuel ratio is constant, the carbon dioxide content in the combustion product is also constant, and the preset threshold value of carbon dioxide and the preset threshold value of oxygen are the carbon dioxide content or the air content in the exhaust gas of the air and the fuel gas under the optimal combustion condition;
Therefore, whether the density of the fuel gas changes or not can be determined according to the relation between the real-time content of the carbon dioxide or the oxygen and the preset threshold value of the carbon dioxide or the oxygen, namely whether the content value deviates from the preset threshold value or not is judged;
if the deviation exists, the control component sends an instruction to a valve control mechanism in the air flow regulating component, namely a stepping motor, so that the control component rotates an air valve, adjusts the opening degree of the air valve, namely Aa, and further adjusts the air-fuel ratio of the deviation; that is, when the air-fuel ratio is increased, the opening degree of the air valve is decreased, and when the air-fuel ratio is decreased, the opening degree of the air valve is increased until the content of oxygen or carbon dioxide in the combustion product, that is, the exhaust gas, is consistent with the preset threshold value. If the current oxygen or carbon dioxide content in the exhaust gas does not deviate from the preset threshold value, the air regulating valve works according to the initial value position.
The method specifically comprises the following steps:
when the real-time content of the carbon dioxide is larger than the preset threshold value of the carbon dioxide or the real-time content of the oxygen is smaller than the preset threshold value of the oxygen, the opening degree of an air valve is increased;
when the real-time content of the carbon dioxide is smaller than the preset threshold of the carbon dioxide or the real-time content of the oxygen is larger than the preset threshold of the oxygen, the opening degree of the air valve is reduced;
And when the real-time content of the carbon dioxide or the oxygen is equal to the preset threshold value, maintaining the initial position of the air valve and continuing combustion.
In a specific implementation, in S2, the adjusting the air flow rate adjusting component according to the relationship between the real-time content of the carbon dioxide or the oxygen and the preset threshold of the carbon dioxide or the oxygen specifically includes:
judging whether the real-time content of the carbon dioxide or the oxygen is equal to a preset threshold value of the carbon dioxide or the oxygen;
if yes, continuing combustion and maintaining the initial position of the air valve;
otherwise, the opening degree of the air valve is adjusted.
Fig. 4 is a detailed control method in which the control method is detailed, and as shown in fig. 4, the control method includes the steps of:
s1, starting the gas water heater, and collecting the real-time content of carbon dioxide or oxygen in the combustion products of the combustion assembly;
s2, adjusting the air flow adjusting component according to the relation between the real-time content of the carbon dioxide or the oxygen and a preset threshold value of the carbon dioxide or the oxygen;
the method specifically comprises the following steps:
judging whether the real-time content of the carbon dioxide is equal to a preset threshold of the carbon dioxide or whether the real-time content of the oxygen is equal to the preset threshold of the carbon dioxide;
If so, maintaining the initial position of the air valve;
otherwise, judging whether the real-time content of the carbon dioxide is greater than a preset threshold of the carbon dioxide or whether the real-time content of the oxygen is less than the preset threshold of the oxygen;
if yes, the opening degree of the air valve is increased;
otherwise, the opening degree of the air valve is reduced.
In the embodiment, by arranging the gas detection assembly, the control assembly and the air flow adjusting assembly, the gas detection assembly can detect the content of carbon dioxide or oxygen in a combustion product and transmit the content to the control assembly, the control assembly can determine whether the proportion of gas and air changes according to the comparison relationship between the received content value and the preset threshold value of the content, and correspondingly control the air flow adjusting assembly, namely control the flow area of air entering the premixing assembly, so that the proportion of air and gas in the premixing assembly is adjusted, namely the air-fuel ratio is adjusted, and the air-fuel ratio of combustion is ensured not to change;
according to the embodiment, the change of the air-fuel ratio is automatically identified, and the air-fuel ratio is automatically adapted and adjusted, so that the full-premix gas water heater keeps a certain air-fuel ratio for combustion, the combustion working condition is ensured, the problems of combustion scream, combustion oscillation and the like are avoided, and the problem of abnormal combustion caused by the change of gas components of the full-premix gas water heater is effectively solved.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A full-premix gas water heater is characterized by comprising a combustion assembly (1), a premix assembly (2), a control assembly (3), a gas detection assembly (4) and an air flow adjusting assembly (5), wherein the premix assembly (2) is communicated with the combustion assembly (1), the gas detection assembly (4) is arranged outside the combustion assembly (1) and is used for detecting the content of carbon dioxide and/or oxygen in combustion products of the combustion assembly (1) and transmitting the content value to the control assembly (3), the air flow adjusting assembly (5) is connected with the premix assembly (2) and is used for adjusting the flow area of air entering the premix assembly (2), the control assembly (3) is used for adjusting the air flow adjusting assembly (5) according to the received content of the carbon dioxide and/or oxygen, to adjust the ratio of air and gas in the premixing assembly (2).
2. A fully premixed gas water heater according to claim 1, wherein said air flow regulating assembly (5) comprises an air valve (51) and a valve control mechanism (52) for controlling said air valve (51), said valve control mechanism (52) being electrically connected to both said air valve (51) and said control assembly (3).
3. A fully premixed gas water heater according to claim 2, wherein said valve control mechanism (52) comprises a stepper motor.
4. The fully premixed gas water heater according to any one of claims 1 to 3, wherein the premixing component (2) comprises a premixer (21), a fully premixed fan (22) and an air-fuel ratio valve (23), the premixer (21) is arranged at an air inlet of the fully premixed fan (22), the air flow adjusting component (5) is connected with the premixer (21), the air-fuel ratio valve (23) is connected with the premixer (21) and used for adjusting the gas input amount entering the premixer (21), and the fully premixed fan (22) and the air-fuel ratio valve (23) are electrically connected with the control component (3).
5. A fully premixed gas water heater according to claim 4, characterized in that the premixing assembly (2) further comprises a gas passage (24) connected to a gas source, the air-fuel ratio valve (23) being provided on the gas passage (24).
6. A fully premixed gas water heater according to claim 1, further comprising a heat exchange assembly (6) connected to said combustion assembly (1), said heat exchange assembly (6) comprising a heat exchange cavity (61), a heat exchanger, a cold water inlet (62) and a hot water outlet (63), said cold water inlet (62) and said hot water outlet (63) being respectively disposed at both sides of said heat exchange cavity (61), said heat exchanger being disposed within said heat exchange cavity (61).
7. A fully premixed gas water heater according to claim 6, further comprising a fume collecting hood (7) provided at one end of said heat exchange assembly (6), the detecting end of said gas detecting assembly (4) being inserted inside said fume collecting hood (7).
8. A fully premixed gas water heater according to claim 7, characterized by further comprising a smoke exhaust pipe (8) communicated with and arranged on the side surface of the smoke collecting hood (7).
9. A control method applied to the fully premixed gas water heater as claimed in any one of claims 3 to 8, characterized by comprising the following steps:
s1, starting the gas water heater, and collecting the real-time content of carbon dioxide or oxygen in the combustion products;
s2, adjusting the air flow adjusting component according to the relation between the real-time content of the carbon dioxide or the oxygen and the preset threshold value of the carbon dioxide or the oxygen.
10. The method as claimed in claim 9, wherein the step S2 is performed to adjust the air flow adjusting assembly according to the relationship between the real-time content of carbon dioxide or oxygen and the preset threshold of carbon dioxide or oxygen, specifically:
judging whether the real-time content of the carbon dioxide is equal to a preset threshold of the carbon dioxide or whether the real-time content of the oxygen is equal to a preset threshold of the oxygen;
if yes, continuing combustion;
conversely, when the real-time content of the carbon dioxide is greater than the preset threshold value of the carbon dioxide or the real-time content of the oxygen is less than the preset threshold value of the oxygen, the opening degree of the air valve is increased;
and when the real-time content of the carbon dioxide is smaller than the preset threshold of the carbon dioxide or the real-time content of the oxygen is larger than the preset threshold of the oxygen, the opening degree of the air valve is reduced.
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| CN202010806927.XA CN111947315A (en) | 2020-08-12 | 2020-08-12 | Fully-premixed gas water heater and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524810A (en) * | 2020-11-26 | 2021-03-19 | 深圳市合信达控制系统有限公司 | Wall-mounted furnace gas self-adaptive adjusting method and device and wall-mounted furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012134033A1 (en) * | 2011-03-25 | 2012-10-04 | 주식회사 경동나비엔 | Separate flow path type of gas-air mixing device |
| CN106152134A (en) * | 2016-08-12 | 2016-11-23 | 佛山市顺德区奇林电气有限公司 | A kind of Intelligent gas furnace being automatically adjusted air-fuel ratio |
| CN107894012A (en) * | 2017-10-26 | 2018-04-10 | 广东美的厨房电器制造有限公司 | The control method of gas-cooker and gas-cooker |
| CN110260524A (en) * | 2019-06-03 | 2019-09-20 | 华帝股份有限公司 | Fully-premixed gas water heater and control method thereof |
| CN209689167U (en) * | 2018-12-10 | 2019-11-26 | 华帝股份有限公司 | Full-premixing gas water heater |
| CN210320689U (en) * | 2019-04-30 | 2020-04-14 | 华帝股份有限公司 | Gas water heater |
-
2020
- 2020-08-12 CN CN202010806927.XA patent/CN111947315A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012134033A1 (en) * | 2011-03-25 | 2012-10-04 | 주식회사 경동나비엔 | Separate flow path type of gas-air mixing device |
| CN106152134A (en) * | 2016-08-12 | 2016-11-23 | 佛山市顺德区奇林电气有限公司 | A kind of Intelligent gas furnace being automatically adjusted air-fuel ratio |
| CN107894012A (en) * | 2017-10-26 | 2018-04-10 | 广东美的厨房电器制造有限公司 | The control method of gas-cooker and gas-cooker |
| CN209689167U (en) * | 2018-12-10 | 2019-11-26 | 华帝股份有限公司 | Full-premixing gas water heater |
| CN210320689U (en) * | 2019-04-30 | 2020-04-14 | 华帝股份有限公司 | Gas water heater |
| CN110260524A (en) * | 2019-06-03 | 2019-09-20 | 华帝股份有限公司 | Fully-premixed gas water heater and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| A.F.威廉斯: "《液化石油气供应指》", 30 September 1981, 中国建筑工业出版社, pages: 98 - 99 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524810A (en) * | 2020-11-26 | 2021-03-19 | 深圳市合信达控制系统有限公司 | Wall-mounted furnace gas self-adaptive adjusting method and device and wall-mounted furnace |
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