CN109539568B - Multi-gas source self-adaptive control method and system for gas appliance - Google Patents
Multi-gas source self-adaptive control method and system for gas appliance Download PDFInfo
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- CN109539568B CN109539568B CN201811617839.4A CN201811617839A CN109539568B CN 109539568 B CN109539568 B CN 109539568B CN 201811617839 A CN201811617839 A CN 201811617839A CN 109539568 B CN109539568 B CN 109539568B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000002737 fuel gas Substances 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims description 179
- 238000002485 combustion reaction Methods 0.000 claims description 22
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 abstract 1
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000001273 butane Substances 0.000 description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 6
- 239000001294 propane Substances 0.000 description 6
- 239000003915 liquefied petroleum gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 244000171022 Peltophorum pterocarpum Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
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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 provides a multi-air source self-adaptive control method and a system thereof, which are characterized in that the proportion coefficient value of an output heat load required in real time and the proportion coefficient value of a reference heat load required by the reference air source at a set temperature are calculated through program operation by collecting water inlet temperature, water outlet temperature, water flow, fan current, fan rotating speed and fuel gas proportional valve current data, the difference change amplitude of the proportion coefficient value of the output heat load required in real time compared with the proportion coefficient value of the reference heat load is judged, the type of the currently used air source is automatically identified, the current value of the fuel gas proportional valve and the fan current value matched with the current value are adjusted, the opening of the fuel gas proportional valve and the rotating speed of the fan reach the optimal proportion, so that the fuel gas appliance can stably, safely, reliably and energy-saving work under different air sources, the self-adaptive capacity of the fuel gas appliance to fuel gas is improved, comfortable and convenient domestic hot water is brought to users, the failure rate of products is reduced, and the national and the standard of flue gas emission is met.
Description
Technical Field
The invention belongs to the technical field of gas appliance circuit control, and particularly relates to a gas appliance multi-gas-source self-adaptive control method and a system thereof.
Background
In the prior art, when the gas water heater burns normally, the opening of the gas proportional valve and the rotating speed of the fan reach the optimal ratio by adopting the current value of the gas proportional valve and the current value of the fan corresponding to the current value of the gas proportional valve, which are preset in a program and are obtained by using a reference gas source. When the same gas source component is changed in proper amount, normal combustion can be ensured, but when the gas source component is changed in large or essence, various abnormal phenomena can occur in each combustion load section in the whole process of the water heater, the technical requirement of normal combustion can not be met, the normal operation of the gas water heater can be influenced when serious, inconvenience is brought to the life of a user, and the use failure rate of a product is increased.
The European requirements for the gas water heater are vigorous, and the gas water heater from the outlet to the European must meet the requirements of various indexes of the European CE standard, however, the European CE standard has higher requirements for the comprehensive performance of the gas water heater: the NOx emission is tested under the reference gas to meet the strict regulation requirement, the combustion can be normally carried out under the limit gas, the operation is stable and reliable, and the CO emission index is required to meet the strict regulation requirement. The air-fuel ratio adjusting control program of the general gas water heater is difficult to adapt to and meet the European CE standard requirement, and the requirement on the performance index of combustion is more so as to restrict the export of most manufacturers in China. In order to solve the problems, various gas source self-adaptive combustion control methods of the gas appliance are researched.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-gas source self-adaptive control method and a system thereof for a gas appliance, which can ensure that the opening degree of a gas proportional valve and the rotating speed of a fan reach the optimal ratio so as to ensure that the gas appliance stably, safely, reliably and energy-effectively works under different gas sources, improve the self-adaptive capability of the gas appliance to the gas and reduce the use failure rate of products.
In order to solve the above technical problems, an aspect of the present invention provides a multi-gas source adaptive control method for a gas appliance, which includes the following steps:
step 1, acquiring data of water inlet temperature, water outlet temperature, water flow, fan current, fan rotating speed and fuel gas proportional valve current in real time through a main controller;
And 2, carrying out data operation on output heat load and reference heat load and the fan current and rotating speed corresponding to the current required by the fuel gas proportional valve acquired in the step 1, and calculating the fuel gas proportional valve current and fan current and rotating speed required by the real-time set temperature and the proportional coefficient value of the corresponding output heat load, wherein the proportional coefficient value= (output heat load/reference heat load) is 100%, the proportional coefficient value of the output heat load is 50% -150%, and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature is 80% -100%.
Step 3, comparing the ratio coefficient value of the output heat load obtained in the step 2 with the ratio coefficient value of the reference heat load, and judging whether the ratio coefficient value of the output heat load reaches the ratio coefficient value of the reference heat load or not;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 4, calculating the proportional coefficient value of the output heat load required in real time in each time period through the data operation in the step 2 in the detection time, and judging whether the proportional coefficient value of the output heat load required in real time in each time period is within the set range value of the proportional coefficient value of the reference heat load;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 5, judging whether the difference between the proportional coefficient value of the output heat load and the proportional coefficient value of the reference heat load reaches an order change value, wherein the order change value is (+/-) (10% -50%), and the order change value is = (reference heat load-output heat load)/100%;
If so, the gas source used by the gas appliance and the type of the reference gas source are greatly changed, and the gas appliance enters a regulation mode of the current of the gas proportional valve, the current of the fan and the rotating speed of the fan so as to achieve the purposes of constant temperature and safe exhaust of smoke; the adjustment amplitude of the adjustment mode is the reference fan current and the rotating speed of (+/-) (10% -50%);
If not, the gas source used by the gas appliance is changed slightly with the reference gas source, and the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current of the reference fan and the rotating speed of the fan, so that the purpose of constant temperature is achieved.
As the optimal scheme of the multi-gas source self-adaptive control method of the gas appliance, the gas source of the gas appliance comprises at least one of methane, propane, liquefied petroleum gas and butane.
In addition, the invention also provides a multi-air source self-adaptive control system of the gas appliance, which comprises a main controller, an operation panel, a gas proportional valve, a fan, a water flow sensor, a water inlet side temperature sensor and a water outlet side temperature sensor,
The operation panel is electrically connected with the main controller, and a user can input a set temperature on the operation panel;
The water flow sensor is electrically connected with the main controller through a water flow acquisition circuit, and sends water flow data to the main controller through the water flow acquisition circuit;
The water inlet side temperature sensor is electrically connected with the main controller through a water inlet temperature acquisition circuit, and the water inlet side temperature sensor sends water inlet temperature data to the main controller through the water inlet temperature acquisition circuit;
The water outlet side temperature sensor is electrically connected with the main controller through a water outlet temperature acquisition circuit, and sends water outlet temperature data to the main controller through the water outlet temperature acquisition circuit;
The main controller is electrically connected with the fuel gas proportional valve through a proportional valve control circuit, and the main controller controls the opening of the fuel gas proportional valve through the proportional valve control circuit;
The main controller is electrically connected with the fan through a fan control circuit, and the main controller controls the rotating speed of the fan through the fan control circuit;
The main controller is provided with an MCU (micro control unit), and the MCU can calculate the proportional coefficient value of the output heat load required in real time and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature through program operation according to the collected data of the water inlet temperature, the water outlet temperature, the water flow, the fan current, the fan rotating speed and the gas proportional valve current, and judge the difference change of the proportional coefficient value of the output heat load required in real time compared with the proportional coefficient value of the reference heat load, and adjust the current value of the gas proportional valve, the fan current matched with the current value and the adjusting amplitude of the rotating speed, so that the opening of the gas proportional valve and the rotating speed of the fan reach the optimal proportion.
As the preferable scheme of the multi-air source self-adaptive control system of the gas appliance, the gas proportional valve is electrically connected with the main controller through the proportional valve current feedback circuit, and the proportional valve current feedback circuit feeds back the current signal of the gas proportional valve to the main controller in real time.
As the preferable scheme of the multi-air source self-adaptive control system of the gas appliance, the fan is electrically connected with the main controller through the fan current feedback circuit, and the fan current feedback circuit feeds back the current signal of the fan to the main controller in real time.
As the preferable scheme of the multi-air source self-adaptive control system of the gas appliance, the fan is electrically connected with the main controller through the rotating speed feedback circuit, and the rotating speed feedback circuit feeds back the rotating speed signal of the fan to the main controller in real time.
As the optimal scheme of the multi-air source self-adaptive control system of the gas appliance, the water flow sensor is arranged on the water inlet pipe or the water outlet pipe of the gas appliance.
As the optimal scheme of the multi-air source self-adaptive control system of the gas appliance, the water inlet side temperature sensor is arranged on the water inlet pipe of the gas appliance.
As the optimal scheme of the multi-air source self-adaptive control system of the gas appliance, the water outlet side temperature sensor is arranged on the water outlet pipe of the gas appliance.
As the preferable scheme of the multi-air source self-adaptive control system of the gas appliance, the fan is a direct current speed regulation fan.
Compared with the prior art, the method and the system for self-adaptive control of multiple gas sources of the gas appliance have the following beneficial effects:
The invention calculates the ratio coefficient value of the output heat load required in real time and the ratio coefficient value of the reference heat load required by the reference air source at the set temperature through the collection of the water inlet temperature, the water outlet temperature, the water flow, the fan current, the fan rotating speed and the current data of the fuel gas proportional valve, and the ratio coefficient value of the reference heat load required by the reference air source at the set temperature is calculated, and judges the difference change of the ratio coefficient value of the output heat load required in real time compared with the ratio coefficient value of the reference heat load, automatically identifies the type of the current air source, adjusts the current value of the fuel gas proportional valve and the fan current adjusting amplitude matched with the current value of the fuel gas proportional valve, so that the opening of the fuel gas proportional valve and the rotating speed of the fan reach the optimal ratio, thereby the fuel gas appliance can stably, safely, reliably and energy-saving work under different air sources, the self-adapting capability of the fuel gas appliance is improved, comfortable and convenient domestic hot water is brought for users, the failure rate of products is reduced, and the national and the smoke emission standard is satisfied.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a connection structure diagram of a multi-gas source adaptive control system for a gas appliance provided by the invention;
FIG. 2 is a flow chart of the method for adaptive control of multiple gas sources of a gas burner according to the present invention;
FIG. 3 is a graph of the proportional coefficient value and the proportional valve current of the heat load with methane as the reference source of the present invention;
FIG. 4 is a graph of the proportional coefficient value and the proportional valve current of the heat load with propane as the reference source in accordance with the present invention;
FIG. 5 is a graph of the proportional coefficient value and the proportional valve current of the heat load of butane-based gas source of the present invention;
FIG. 6 is a schematic diagram of the heat load versus air and gas flow between methane, propane, LPG, and butane sources.
In the figure, 1 is a water inlet temperature acquisition circuit, 2 is a water outlet temperature acquisition circuit, 3 is a water flow acquisition circuit, 4 is a main controller, 5 is a proportional valve control circuit, 6 is a fuel gas proportional valve, 7 is a proportional valve current feedback circuit, 8 is a fan control circuit, 9 is a rotating speed feedback circuit, 10 is a fan current feedback circuit, 11 is a fan, 12 is an operation panel, 13 is a water flow sensor, 14 is a water inlet side temperature sensor, and 15 is a water outlet side temperature sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2 in combination, the preferred embodiment of the multi-gas source adaptive control method for a gas appliance provided by the invention comprises the following steps:
step 1, acquiring data of water inlet temperature, water outlet temperature, water flow, fan current, fan rotating speed and fuel gas proportional valve current in real time through a main controller;
And 2, carrying out data operation on output heat load and reference heat load and the fan current and rotating speed corresponding to the current required by the fuel gas proportional valve acquired in the step 1, and calculating the fuel gas proportional valve current and fan current and rotating speed required by the real-time set temperature and the proportional coefficient value of the corresponding output heat load, wherein the proportional coefficient value= (output heat load/reference heat load) is 100%, the proportional coefficient value of the output heat load is 50% -150%, and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature is 80% -100%.
Step 3, comparing the ratio coefficient value of the output heat load obtained in the step 2 with the ratio coefficient value of the reference heat load, and judging whether the ratio coefficient value of the output heat load reaches the ratio coefficient value of the reference heat load or not;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 4, calculating the proportional coefficient value of the output heat load required in real time in each time period through the data operation in the step 2 in the detection time, and judging whether the proportional coefficient value of the output heat load required in real time in each time period is within the set range value of the proportional coefficient value of the reference heat load;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 5, judging whether the difference between the proportional coefficient value of the output heat load and the proportional coefficient value of the reference heat load reaches an order change value, wherein the order change value is (+/-) (10% -50%), and the order change value is = (reference heat load-output heat load)/100%;
If so, the gas source used by the gas appliance and the type of the reference gas source are greatly changed, and the gas appliance enters a regulation mode of the current of the gas proportional valve, the current of the fan and the rotating speed of the fan so as to achieve the purposes of constant temperature and safe exhaust of smoke; the adjustment amplitude of the adjustment mode is the reference fan current and the rotating speed of (+/-) (10% -50%);
if not, the gas source used by the gas appliance is changed slightly with the reference gas source, and the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved.
The gas source of the gas appliance comprises at least one of methane, propane, liquefied petroleum gas and butane.
Therefore, the invention calculates the ratio coefficient value of the output heat load required in real time and the ratio coefficient value of the reference heat load required by the reference air source at the set temperature through the collection of the water inlet temperature, the water outlet temperature, the water flow, the fan current, the fan rotating speed and the current data of the gas proportional valve, and the program operation, judges the difference change of the ratio coefficient value of the output heat load required in real time compared with the ratio coefficient value of the reference heat load, automatically identifies the type of the currently used air source, adjusts the current value of the gas proportional valve and the fan current adjustment amplitude matched with the current value of the gas proportional valve, ensures that the opening of the gas proportional valve and the rotating speed of the fan reach the optimal ratio, so as to meet the stable, safe, reliable and energy-saving operation of the gas appliance under different air sources, improve the self-adaptive capacity of the gas appliance to bring comfortable and convenient domestic hot water for users, reduce the product use failure rate and meet the national and domestic and foreign smoke emission standard.
In addition, in order to facilitate the implementation of the control method, the invention also provides a multi-air-source self-adaptive control system of the gas appliance, which comprises a main controller 4, an operation panel 12, a gas proportional valve 6, a fan 11, a water flow sensor 13, a water inlet side temperature sensor 14 and a water outlet side temperature sensor 15.
The operation panel 12 (e.g. touch screen) is electrically connected to the main controller 4, and a user can input a set temperature on the operation panel 12; specifically, the output end of the operation panel 12 is electrically connected to the input end of the main controller 4.
The water flow sensor 13 is electrically connected with the main controller 4 through the water flow acquisition circuit 3, and the water flow sensor 13 sends water flow data through the main controller 4 through the water flow acquisition circuit 3; specifically, the output end of the water flow sensor 13 is electrically connected with the input end of the water flow acquisition circuit 3, and the output end of the water flow acquisition circuit 3 is electrically connected with the input end of the main controller 4.
The water inlet side temperature sensor 14 is electrically connected with the main controller 4 through the water inlet temperature acquisition circuit 1, and the water inlet side temperature sensor 14 sends water inlet temperature data to the main controller 4 through the water inlet temperature acquisition circuit 1; specifically, the output end of the water inlet side temperature sensor 14 is electrically connected with the input end of the water inlet temperature acquisition circuit 1, and the output end of the water inlet temperature acquisition circuit 1 is electrically connected with the input end of the main controller 4.
The water outlet side temperature sensor 15 is electrically connected with the main controller 4 through the water outlet temperature acquisition circuit 2, and the water outlet side temperature sensor 15 sends water temperature data to the main controller 4 through the water outlet temperature acquisition circuit 2; specifically, the output end of the water outlet side temperature sensor 15 is electrically connected with the input end of the water outlet temperature acquisition circuit 2, and the output end of the water outlet temperature acquisition circuit 2 is electrically connected with the input end of the main controller 4.
The main controller 4 is electrically connected with the fuel gas proportional valve 6 through the proportional valve control circuit 5, and the main controller 4 controls the opening degree of the fuel gas proportional valve 6 through the proportional valve control circuit 5 to provide corresponding fuel gas quantity requirements for loads required by real-time combustion; specifically, the output end of the main controller 4 is electrically connected with the input end of the proportional valve control circuit 5, and the output end of the proportional valve control circuit 5 is electrically connected with the input end of the fuel gas proportional valve 6.
The main controller 4 is electrically connected with the fan 11 through the fan control circuit 8, and the main controller 4 controls the rotating speed of the fan 11 through the fan control circuit 8 to provide corresponding air quantity requirements for loads required by real-time combustion; specifically, the output end of the main controller 4 is electrically connected with the input end of the fan control circuit 8, and the output end of the fan control circuit 8 is electrically connected with the input end of the fan 11.
The main controller 4 is provided with an MCU micro-control unit, and the MCU micro-control unit can calculate the real-time required proportion coefficient value of the output heat load and the reference heat load proportion coefficient value of the reference air source at the set temperature through program operation according to the collected data of the water inlet temperature, the water outlet temperature, the water flow, the fan current, the fan rotating speed and the fuel gas proportion valve current, and judge the difference change of the real-time required proportion coefficient value of the output heat load compared with the proportion coefficient value of the reference heat load, and adjust the current value of the fuel gas proportion valve and the fan current and the fan rotating speed matched with the current value of the fuel gas proportion valve, so that the opening of the fuel gas proportion valve 6 and the rotating speed of the fan 11 reach the optimal proportion.
It should be noted that the MCU micro-control unit may be an 8-bit or 16-bit or 32-bit single chip microcomputer, and the MCU micro-control unit stores therein a proportional coefficient value of a reference heat load required by a reference air source corresponding to a same liter (one minute of heat production water) product gas proportional valve current, and the reference proportional valve current matches with a fan current and a rotation speed value; the same-liter-number product is based on a proportional valve current gear value and a fan current and rotating speed gear value corresponding to the yellow flame limit gas, the off flame limit gas and the tempering limit gas which are required to be tested under a reference gas source to meet the standard requirement of the gas water heater; the same-liter-number product is based on a proportional valve current gear value and a fan current and rotating speed gear value which are required by exchanging different gas sources of methane, propane, liquefied petroleum gas and butane under a certain reference gas source.
FIG. 3 is a graph of the proportional coefficient value of the heat load of the water heater and the fuel gas proportional valve current with methane as a reference gas source and corresponding boundary gas; FIG. 4 is a graph of the proportional coefficient value of the heat load of the water heater and the fuel gas proportional valve current with propane as the reference gas source and corresponding margin gas; FIG. 5 is a linear graph of the proportional coefficient value of the heat load of the water heater and the current of the gas proportional valve with butane as a reference gas source and corresponding limit gas; fig. 6 shows a relationship between the required gas amount and the air volume in a certain heat load demand interval.
The gas proportional valve 6 is electrically connected to the main controller 4 through a proportional valve current feedback circuit 7, and the proportional valve current feedback circuit 7 feeds back a current signal of the gas proportional valve 6 to the main controller 4 in real time, so as to monitor the working current of the gas proportional valve 6 in real time. Specifically, the output end of the fuel gas proportional valve 6 is electrically connected with the input end of the proportional valve current feedback circuit 7, and the output end of the proportional valve current feedback circuit 7 is electrically connected with the input end of the main controller 4.
Illustratively, the fan 11 is electrically connected to the main controller 4 through a fan current feedback circuit 10, and the fan current feedback circuit 10 feeds back a current signal of the fan 11 to the main controller 4 in real time, so as to monitor the working current of the fan 11 in real time. Specifically, the output end of the fan 11 is electrically connected with the input end of the fan current feedback circuit 10, and the output end of the fan current feedback circuit 10 is electrically connected with the input end of the main controller 4.
Illustratively, the fan 11 is electrically connected to the main controller 4 through a rotation speed feedback circuit 9, and the rotation speed feedback circuit 9 feeds back a rotation speed signal of the fan 11 to the main controller 4 in real time, so as to monitor the rotation speed of the fan 11 in real time. Specifically, the output end of the fan 11 is electrically connected with the input end of the rotation speed feedback circuit 9, and the output end of the rotation speed feedback circuit 9 is electrically connected with the input end of the main controller 4.
The water flow sensor 13 is illustratively provided on the inlet or outlet pipe of the gas appliance.
Illustratively, the inlet side temperature sensor 14 is disposed on the inlet pipe of the gas appliance.
Illustratively, the outlet side temperature sensor 15 is disposed on an outlet pipe of the gas appliance.
The fan 11 is illustratively a dc speed fan.
It should be noted that, the direct current speed regulation fan 11 adopts constant current control technology and pulse width modulation driving to provide air volume for the combustion of the water heater; the fuel gas proportional valve 6 adopts constant current control technology and pulse width modulation driving to provide fuel gas for the combustion of the water heater.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (9)
1. The multi-gas source self-adaptive control method for the gas appliance is characterized by comprising the following steps of:
Step 1, acquiring data of water inlet temperature, water outlet temperature, water flow, fan current, fan rotating speed and fuel gas proportional valve current in real time through a main controller;
Step 2, carrying out data operation on the data acquired in the step 1, namely outputting heat load, reference heat load, fuel gas proportional valve current, fan current and fan rotating speed, and calculating the proportional coefficient value of the fuel gas proportional valve current, the fan rotating speed and the output heat load required by setting the temperature in real time, wherein the proportional coefficient value= (output heat load/reference heat load) is 100%, the proportional coefficient value of the output heat load is 50% -150%, and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature is 80% -100%;
step 3, comparing the ratio coefficient value of the output heat load obtained in the step 2 with the ratio coefficient value of the reference heat load, and judging whether the ratio coefficient value of the output heat load reaches the ratio coefficient value of the reference heat load or not;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 4, calculating the proportional coefficient value of the output heat load required in real time in each time period through the data operation in the step 2 in the detection time, and judging whether the proportional coefficient value of the output heat load required in real time in each time period is within the set range value of the proportional coefficient value of the reference heat load;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 5, judging whether the difference between the proportional coefficient value of the output heat load and the proportional coefficient value of the reference heat load reaches an order change value, wherein the order change value is (+/-) (10% -50%), and the order change value is = (reference heat load-output heat load)/100%;
if so, the gas source used by the gas appliance and the type of the reference gas source are greatly changed, and the gas appliance enters a regulation mode of the current of the gas proportional valve, the current of the fan and the rotating speed of the fan so as to achieve the purposes of constant temperature and safe exhaust of smoke; the adjustment amplitude of the adjustment mode is the reference fan current and the fan rotating speed of (+/-) (10% -50%);
If not, the gas source used by the gas appliance is changed slightly with the reference gas source, and the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current of the reference fan and the rotating speed of the fan, so that the purpose of constant temperature is achieved.
2. A multi-air source self-adaptive control system of a gas appliance is characterized by comprising a main controller, an operation panel, a gas proportional valve, a fan, a water flow sensor, a water inlet side temperature sensor and a water outlet side temperature sensor,
The operation panel is electrically connected with the main controller, and a user can input a set temperature on the operation panel;
The water flow sensor is electrically connected with the main controller through a water flow acquisition circuit, and sends water flow data to the main controller through the water flow acquisition circuit;
The water inlet side temperature sensor is electrically connected with the main controller through a water inlet temperature acquisition circuit, and the water inlet side temperature sensor sends water inlet temperature data to the main controller through the water inlet temperature acquisition circuit;
The water outlet side temperature sensor is electrically connected with the main controller through a water outlet temperature acquisition circuit, and sends water outlet temperature data to the main controller through the water outlet temperature acquisition circuit;
The main controller is electrically connected with the fuel gas proportional valve through a proportional valve control circuit, and the main controller controls the opening of the fuel gas proportional valve through the proportional valve control circuit;
The main controller is electrically connected with the fan through a fan control circuit, and the main controller controls the rotating speed of the fan through the fan control circuit;
The main controller is provided with an MCU (micro control unit), and the MCU can calculate the proportional coefficient value of the output heat load required by the real-time set temperature and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature through program operation according to the acquired data of the water inlet temperature, the water outlet temperature, the water flow, the fan current, the fan rotating speed and the fuel gas proportional valve current, and judge the difference change of the proportional coefficient value of the output heat load required in real time compared with the proportional coefficient value of the reference heat load, and adjust the current value of the fuel gas proportional valve, the fan current and the fan rotating speed matched with the current value and the fan rotating speed to ensure that the opening of the fuel gas proportional valve and the rotating speed of the fan reach the optimal proportion; the MCU micro-control unit executes the following control steps:
Step 1, acquiring data of water inlet temperature, water outlet temperature, water flow, fan current, fan rotating speed and fuel gas proportional valve current in real time through a main controller;
Step 2, carrying out data operation on the data acquired in the step 1, namely outputting heat load, reference heat load, fuel gas proportional valve current, fan current and fan rotating speed, and calculating the proportional coefficient value of the fuel gas proportional valve current, the fan rotating speed and the output heat load required by setting the temperature in real time, wherein the proportional coefficient value= (output heat load/reference heat load) is 100%, the proportional coefficient value of the output heat load is 50% -150%, and the proportional coefficient value of the reference heat load required by the reference air source at the set temperature is 80% -100%;
step 3, comparing the ratio coefficient value of the output heat load obtained in the step 2 with the ratio coefficient value of the reference heat load, and judging whether the ratio coefficient value of the output heat load reaches the ratio coefficient value of the reference heat load or not;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 4, calculating the proportional coefficient value of the output heat load required in real time in each time period through the data operation in the step 2 in the detection time, and judging whether the proportional coefficient value of the output heat load required in real time in each time period is within the set range value of the proportional coefficient value of the reference heat load;
if so, the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current and the rotating speed of the reference fan, so that the purpose of constant temperature is achieved;
if not, the gas appliance enters the next step;
Step 5, judging whether the difference between the proportional coefficient value of the output heat load and the proportional coefficient value of the reference heat load reaches an order change value, wherein the order change value is (+/-) (10% -50%), and the order change value is = (reference heat load-output heat load)/100%;
if so, the gas source used by the gas appliance and the type of the reference gas source are greatly changed, and the gas appliance enters a regulation mode of the current of the gas proportional valve, the current of the fan and the rotating speed of the fan so as to achieve the purposes of constant temperature and safe exhaust of smoke; the adjustment amplitude of the adjustment mode is the reference fan current and the fan rotating speed of (+/-) (10% -50%);
If not, the gas source used by the gas appliance is changed slightly with the reference gas source, and the gas appliance enters a normal working mode that the current of the gas proportional valve required by normal combustion is correspondingly matched with the current of the reference fan and the rotating speed of the fan, so that the purpose of constant temperature is achieved.
3. The gas appliance multi-gas source self-adaptive control system according to claim 2, wherein the gas proportional valve is electrically connected with the main controller through a proportional valve current feedback circuit, and the proportional valve current feedback circuit feeds back a current signal of the gas proportional valve to the main controller in real time.
4. The gas appliance multi-gas source self-adaptive control system according to claim 2, wherein the fan is electrically connected with the main controller through a fan current feedback circuit, and the fan current feedback circuit feeds back a current signal of the fan to the main controller in real time.
5. The gas appliance multi-gas source self-adaptive control system according to claim 2, wherein the fan is electrically connected with the main controller through a rotation speed feedback circuit, and the rotation speed feedback circuit feeds back a rotation speed signal of the fan to the main controller in real time.
6. The gas appliance multi-gas source adaptive control system according to claim 2, wherein the water flow sensor is provided on a water inlet pipe or a water outlet pipe of the gas appliance.
7. The gas appliance multi-gas source adaptive control system according to claim 2, wherein the water inlet side temperature sensor is provided on a water inlet pipe of the gas appliance.
8. The gas appliance multi-gas source adaptive control system according to claim 2, wherein the outlet side temperature sensor is provided on an outlet pipe of the gas appliance.
9. The gas appliance multi-gas source adaptive control system of claim 2, wherein the fan is a dc speed fan.
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| CN112050473B (en) * | 2020-08-24 | 2022-08-02 | 芜湖美的厨卫电器制造有限公司 | Power compensation method and compensation device for water heater and computer readable storage medium |
| CN112413658B (en) * | 2020-12-14 | 2023-07-04 | 深圳市合信达控制系统有限公司 | Gas quantity detection method and device and gas furnace |
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