CN110230886B - Control method and control system of gas water heater with self-adaptive gas source - Google Patents
Control method and control system of gas water heater with self-adaptive gas source Download PDFInfo
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- CN110230886B CN110230886B CN201811253126.4A CN201811253126A CN110230886B CN 110230886 B CN110230886 B CN 110230886B CN 201811253126 A CN201811253126 A CN 201811253126A CN 110230886 B CN110230886 B CN 110230886B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 218
- 239000002912 waste gas Substances 0.000 claims description 76
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 63
- 229910052760 oxygen Inorganic materials 0.000 claims description 63
- 239000001301 oxygen Substances 0.000 claims description 63
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 41
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 41
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 13
- 239000003345 natural gas Substances 0.000 claims description 10
- 239000003949 liquefied natural gas Substances 0.000 claims description 6
- 239000003034 coal gas Substances 0.000 claims 1
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002699 waste material 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
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a control method and a control system of a gas water heater with a self-adaptive gas source.
Description
Technical Field
The invention belongs to the technical field of gas source judgment and control of gas water heaters, and particularly relates to a control method and a control system of a gas water heater with a self-adaptive gas source.
Background
At present, most of the existing household gas water heaters can only use a single gas source, and when the gas water heaters use different gases, related structural parts and control parameters are required to be replaced, so that the household gas water heaters are very inconvenient for users.
In the prior art, the structure of the armature in the gas water heater is changed, the actuation capacity of the armature is improved, and the magnetic circuit area of the armature is increased, so that the gas water heater can adapt to different gas sources, but the gas water heater is complex in structure, high in cost and difficult to popularize and apply.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a control method and a control system of a gas water heater with an adaptive gas source.
The technical scheme of the invention is realized as follows:
the embodiment of the invention provides a control method of a gas water heater with a self-adaptive gas source, which comprises the following steps: collecting the current concentration of the waste gas under the working state of the gas water heater; determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration; and switching to the working state corresponding to the air source type according to the determined current air source type.
Preferably, the current gas source types include liquefied petroleum gas, natural gas, and artificial gas.
Preferably, the current exhaust gas concentration includes a current carbon monoxide exhaust gas concentration and an excess oxygen exhaust gas concentration, and the preset exhaust gas standard concentration includes a carbon monoxide exhaust gas standard concentration and an excess oxygen exhaust gas standard concentration.
Preferably, the current gas source type of the gas water heater is determined according to the comparison relationship between the current exhaust gas concentration and a preset exhaust gas standard concentration, specifically, if the current carbon monoxide exhaust gas concentration is greater than or equal to the preset carbon monoxide exhaust gas standard concentration, the current gas source type is directly determined to be liquefied petroleum gas; and if the current carbon monoxide waste gas concentration is less than the preset carbon monoxide waste gas standard concentration, determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
Preferably, the current gas source type of the gas water heater is determined according to the comparison relationship between the current excess oxygen exhaust gas concentration and a preset excess oxygen exhaust gas standard concentration, specifically, if the current excess oxygen exhaust gas concentration is greater than or equal to twice of the preset excess oxygen exhaust gas standard concentration, the current gas source type is determined to be artificial gas; and if the concentration of the current excess oxygen waste gas is less than twice of the preset standard concentration of the excess oxygen waste gas, determining that the current gas source type is natural gas.
Preferably, the operation state corresponding to the air source type is switched to according to the determined current air source type, specifically, the opening degree of a gas proportional valve corresponding to the air source type and the rotating speed of the fan are switched to according to the determined current air source type.
The embodiment of the invention also provides a control system of the gas water heater, which comprises an acquisition unit and a control unit;
the acquisition unit is used for acquiring the current concentration of the waste gas in the working state of the gas water heater;
the control unit is used for determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration;
and the control unit is also used for switching to a working state corresponding to the air source type according to the determined current air source type.
Preferably, the control unit is specifically configured to directly determine that the current gas source type is the liquefied petroleum gas if the current carbon monoxide exhaust gas concentration is greater than or equal to the preset carbon monoxide exhaust gas standard concentration; and if the current carbon monoxide waste gas concentration is less than the preset carbon monoxide waste gas standard concentration, determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
Preferably, the control unit is specifically configured to determine that the current gas source type is the artificial gas if the current excess oxygen exhaust gas concentration is greater than or equal to twice the preset standard concentration of the excess oxygen exhaust gas; and if the concentration of the current excess oxygen waste gas is less than twice of the preset standard concentration of the excess oxygen waste gas, determining that the current gas source type is natural gas.
Preferably, the control unit is specifically configured to switch to the opening degree of the gas proportional valve corresponding to the gas source type and the rotation speed of the fan according to the determined current gas source type.
Compared with the prior art, the method and the device can determine the current air source type of the gas water heater by acquiring the current waste gas concentration of the gas water heater in the working state, and switch the working state of the gas water heater to the working state corresponding to the current air source type according to the determined current air source type, so that different air demands corresponding to different air sources during combustion can be met, and the effect of adjusting the working state of the gas water heater according to different air source types can be realized in a low-cost manner.
Drawings
Fig. 1 is a flowchart of a control method of a gas water heater with an adaptive gas source according to embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and 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 1 of the present invention provides a method for controlling a gas water heater with an adaptive gas source, and the method has a flow chart, as shown in fig. 1, and specifically includes the following steps:
step S1: collecting the current concentration of the waste gas under the working state of the gas water heater;
the initial working state of the gas water heater defaults to working parameters of a natural gas source.
The current exhaust gas concentration comprises the current carbon monoxide exhaust gas concentration and the excess oxygen exhaust gas concentration, and the preset exhaust gas standard concentration comprises the carbon monoxide exhaust gas standard concentration and the excess oxygen exhaust gas standard concentration.
Step S2: determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration;
among them, the current gas source types include liquefied petroleum gas, natural gas, and artificial gas.
Under a certain working condition of the gas water heater, because the air demand of different gas source types during combustion is different, the air demand of common liquefied petroleum gas, natural gas and artificial gas is arranged from large to small, the waste gas concentration of different gas source types during combustion is different, specifically, the carbon monoxide waste gas concentration and the excess oxygen concentration of different gas source types during combustion are different, therefore, the current gas source type of the gas water heater can be determined according to the comparison relationship between the current waste gas concentration and the preset waste gas standard concentration, specifically according to the comparison relationship between the current carbon monoxide waste gas concentration and the preset carbon monoxide waste gas standard concentration and the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
In step S2, the current carbon monoxide off-gas concentration is specifically ρ'coThe preset standard concentration of the carbon monoxide waste gas is set as rhocoThe current excess oxygen concentration is ρ'o2Setting the preset standard concentration of the excess oxygen exhaust gas as rho'o2。
The preset standard concentration of the carbon monoxide waste gas is set as rhocoAnd the preset standard concentration of the excess oxygen exhaust gas is set as rho'o2The gas water heater is designed according to the specific design of the gas water heater and meets the national standard requirements.
If the current carbon monoxide waste gas concentration rho'coGreater than or equal to the preset standard concentration rho of the carbon monoxide waste gascoDirectly determining that the current gas source type is liquefied petroleum gas; if the current carbon monoxide waste gas concentration rho'coLess than the preset standard concentration rho of the carbon monoxide waste gascoAnd determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
If the current excess oxygen concentration rho'o2Greater than or equal to the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2≥2ρo2Determining that the current gas source type is artificial gas; if the current excess oxygen exhaust gas concentration rho'o2Less than the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2＜2ρo2Then the current source type is determined to be natural gas.
Step S3: switching to a working state corresponding to the air source type according to the determined current air source type;
according to the heat load interval of the gas water heater and the caliber of the nozzle, the former secondary pressure of the nozzle corresponding to different gas source types can be determined, and therefore the adjusting range of the gas proportional valve corresponding to different gas source types is determined.
Specifically, the thermal load interval of the gas water heater is [ QL, QH ], the previous secondary pressure of the nozzles corresponding to different gas source types can be determined according to formula 1, and formula 1 is as follows:
wherein n is the number of nozzles; mu is a flow coefficient, and a constant is obtained after a nozzle is selected; p2The former secondary pressure of the nozzle is adopted; dgIs the inner diameter of the nozzle; s is the relative density of fuel gas; hLAnd (4) low heat value of the fuel gas.
The adjusting ranges of the gas proportional valves corresponding to different gas source types are generally that the adjusting ranges of the liquefied petroleum gas are [ PL1, PH1], the natural gas [ PL2, PH2] and the artificial gas [ PL3, PH3], and the calorific values are respectively liquefied petroleum gas, natural gas and artificial gas from high to low according to three origin characteristics, so that when all gas sources meet the heat load [ QL, QH ] in the adjusting ranges, PL1< PL2< PL3, PH1< PH2< PH 3.
And further determining the motor control parameters corresponding to different gas source types according to the control ranges of the gas proportional valves corresponding to different gas source types.
Specifically, the opening degree of a gas proportional valve corresponding to the gas source type and the rotating speed of a fan are switched to according to the determined current gas source type.
Example 2
The embodiment 2 of the invention provides a control system of a gas water heater, which comprises an acquisition unit and a control unit;
the acquisition unit is used for acquiring the current concentration of the waste gas in the working state of the gas water heater;
the collection unit is specifically an exhaust detection device for detecting the current carbon monoxide exhaust gas concentration and the current excess oxygen exhaust gas concentration.
The control unit is used for determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration; and the system is also used for switching to the working state corresponding to the air source type according to the determined current air source type.
The control unit is specifically configured to directly determine that the current gas source type is liquefied petroleum gas if the current carbon monoxide exhaust gas concentration is greater than or equal to the preset carbon monoxide exhaust gas standard concentration; and if the current carbon monoxide waste gas concentration is less than the preset carbon monoxide waste gas standard concentration, determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
The control unit is further specifically configured to determine that the current gas source type is artificial gas if the current excess oxygen exhaust gas concentration is greater than or equal to twice the preset standard concentration of excess oxygen exhaust gas; and if the concentration of the current excess oxygen waste gas is less than twice of the preset standard concentration of the excess oxygen waste gas, determining that the current gas source type is natural gas.
And the control unit is further specifically used for switching to the opening degree of the gas proportional valve corresponding to the gas source type and the rotating speed of the fan according to the determined current gas source type.
Example 3
An embodiment 3 of the present invention provides a gas water heater, which includes the control system of the gas water heater described in embodiment 2, and the control method of the gas water heater with an adaptive gas source described in embodiment 1 is applied to the gas water heater.
The gas water heater comprises a control system, a water flow sensor, a water regulating valve, a water inlet and outlet temperature sensor, a gas proportional valve, a gas distributing rod, a burner, a heat exchanger, a smoke hood fan and an exhaust detection device.
The control system comprises an acquisition unit and a control unit, wherein the acquisition unit is an exhaust detection device.
The working process of the gas water heater is as follows:
and (4) preparing, namely storing the control ranges of the gas proportional valves corresponding to different gas source types and the motor control parameters further determined according to the control ranges of the gas proportional valves corresponding to different gas source types in the control unit.
And the preset values of the standard concentration of the carbon monoxide waste gas and the standard concentration of the excess oxygen waste gas are stored in the control unit.
Initialization: the gas water heater is powered on, power-on self-test is carried out, whether each part of components work normally is detected through the control unit, preset data in preparation work are loaded, and set data are initialized to hardware.
Collecting the current exhaust gas concentration: introducing a certain gas into the gas water heater, wherein the gas is suitable for ignition of liquefied petroleum gas, natural gas and artificial gas; after working for a certain time, generally after 2min, collecting data of the waste detection device through a collecting unit of the control system, specifically, the current concentration of the carbon monoxide waste gas is rho'coThe current concentration of the excess oxygen exhaust gas is ρ'o2。
Determining the current air source type: judging that the concentration of the current carbon monoxide waste gas is rho'coWhether the standard concentration of the carbon monoxide waste gas is more than or equal to the preset standard concentration is set as rhocoIf the current excess oxygen exhaust gas concentration rho'o2Greater than or equal to the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2≥2ρo2Determining that the current gas source type is artificial gas; if the current excess oxygen exhaust gas concentration rho'o2Less than the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2＜2ρo2Then the current source type is determined to be natural gas.
If the current excess oxygen exhaust gas concentration rho'o2Greater than or equal to the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2≥2ρo2Determining that the current gas source type is artificial gas; if the current excess oxygen exhaust gas concentration rho'o2Less than the preset standard concentration rho of the excess oxygen exhaust gaso2Is twice as much as ρ'o2＜2ρo2Then determineThe current source type is natural gas.
Switching the working state of the gas water heater: and switching to the working state corresponding to the air source type according to the determined current air source type.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. A control method of a gas water heater with a self-adaptive gas source is characterized in that the current concentration of waste gas is collected under the working state of the gas water heater; determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration; switching to a working state corresponding to the air source type according to the determined current air source type;
the current gas source types comprise liquefied petroleum gas, natural gas and artificial gas; the current exhaust gas concentration comprises the current carbon monoxide exhaust gas concentration and the current excess oxygen exhaust gas concentration, and the preset exhaust gas standard concentration comprises the carbon monoxide exhaust gas standard concentration and the excess oxygen exhaust gas standard concentration;
determining the current gas source type of the gas water heater according to the comparison relationship between the current waste gas concentration and a preset waste gas standard concentration, specifically, if the current carbon monoxide waste gas concentration is greater than or equal to the preset carbon monoxide waste gas standard concentration, directly determining that the current gas source type is liquefied petroleum gas; if the current carbon monoxide waste gas concentration is smaller than the preset carbon monoxide waste gas standard concentration, determining the current gas source type of the gas water heater according to the comparison relation between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration;
determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration, specifically, if the current excess oxygen concentration is greater than or equal to twice the preset excess oxygen standard concentration, determining that the current gas source type is artificial coal gas; and if the concentration of the current excess oxygen waste gas is less than twice of the preset standard concentration of the excess oxygen waste gas, determining that the current gas source type is natural gas.
2. The method according to claim 1, wherein the current air source type is switched to the working state corresponding to the air source type according to the determination, specifically, the opening degree of the gas proportional valve corresponding to the air source type and the rotation speed of the fan are switched according to the determined current air source type.
3. A control system of a gas water heater applying the control method of claim 1 or 2, characterized by comprising a collecting unit and a control unit;
the acquisition unit is used for acquiring the current concentration of the waste gas in the working state of the gas water heater;
the control unit is used for determining the current gas source type of the gas water heater according to the comparison relation between the current waste gas concentration and the preset waste gas standard concentration;
and the control unit is also used for switching to a working state corresponding to the air source type according to the determined current air source type.
4. The control system of a gas water heater according to claim 3, wherein the control unit is specifically configured to directly determine that the current gas source type is lpg if the current carbon monoxide exhaust gas concentration is greater than or equal to the preset carbon monoxide exhaust gas standard concentration; and if the current carbon monoxide waste gas concentration is less than the preset carbon monoxide waste gas standard concentration, determining the current gas source type of the gas water heater according to the comparison relationship between the current excess oxygen waste gas concentration and the preset excess oxygen waste gas standard concentration.
5. The control system of the gas water heater according to claim 4, wherein the control unit is specifically configured to determine that the current gas source type is the artificial gas if the current excess oxygen exhaust gas concentration is greater than or equal to twice the preset standard concentration of the excess oxygen exhaust gas; and if the concentration of the current excess oxygen waste gas is less than twice of the preset standard concentration of the excess oxygen waste gas, determining that the current gas source type is natural gas.
6. The control system of a gas water heater according to claim 3, wherein the control unit is specifically configured to switch to an opening degree of a gas proportional valve and a rotation speed of the fan corresponding to the gas source type according to the determined current gas source type.
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| CN112577203B (en) * | 2019-09-30 | 2022-12-30 | 芜湖美的厨卫电器制造有限公司 | Air source switching method and device, water heater and computer readable storage medium |
| CN111174412A (en) * | 2019-12-27 | 2020-05-19 | 威能(无锡)供热设备有限公司 | Gas water heating equipment |
| CN114111054A (en) * | 2020-09-01 | 2022-03-01 | 云米互联科技(广东)有限公司 | Control method of gas water heater, gas water heater and storage medium |
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