CN216744953U - Intelligent combustion system of gas water heater - Google Patents
Intelligent combustion system of gas water heater Download PDFInfo
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- CN216744953U CN216744953U CN202121836193.6U CN202121836193U CN216744953U CN 216744953 U CN216744953 U CN 216744953U CN 202121836193 U CN202121836193 U CN 202121836193U CN 216744953 U CN216744953 U CN 216744953U
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Abstract
The utility model discloses an intelligent combustion system of a gas water heater, which comprises the gas water heater and is characterized by further comprising a temperature sensor, a flow sensor, a proportional valve for controlling gas and a proportional valve control module, wherein the temperature sensor comprises a water inlet temperature sensor and a water outlet temperature sensor, the input temperature sensor is arranged on a water inlet pipeline of the water heater, the water outlet temperature sensor and the flow sensor are arranged on a water outlet pipeline of the water heater, and the output end of the proportional valve control module controls the opening degree of the proportional valve. Based on the hot water yield, the environment of the current combustion is automatically judged, the opening of the proportional valve is automatically corrected, the optimal air-fuel ratio is achieved, and the service life of the appliance is prolonged. The proportional valve control system adopted by the utility model can dynamically adjust the air-fuel ratio according to the actual combustion working condition, can meet the air-fuel ratio requirement of a low-nitrogen emission machine type, and solves the problem of combustion resonance which cannot be solved by domestic manufacturers at present.
Description
Technical Field
The utility model relates to the field of water heater control, in particular to an intelligent combustion system of a gas water heater and a control method thereof.
Background
The gas water heater mainly comprises a fan, a fire grate, a water tank, an electromagnetic valve, a temperature sensor and a proportional valve. During combustion, the main components are fuel gas and air, and constant temperature control is achieved by adjusting the air and fuel gas flow. For most combustion control systems with the same air source, the air-fuel ratio is set in the current environment in production. In the customer environment, because the difference of each local gas calorific value, the difference of gas temperature and atmospheric pressure, the difference of customer's installation environment and tobacco pipe length, the not enough of gas primary pressure all can lead to the burning to appear unusually, leads to the gas heater life-span to shorten, hardly guarantees the problem of complete combustion. The prior art aims at different gas sources, and achieves the air-fuel ratio of combustion by building different gas source dial switches, but the combustion system of the existing water heater is difficult to solve the problems of different heating values of gas in various places, different altitude atmospheric pressures, insufficient gas pressure in installation environment and peak time period. And the air-fuel ratio requirement of the combustion of the low-nitrogen-emission gas water heater is very high, the combustion range is very narrow, the gas combustion is insufficient, the height of flame of a combustor is uneven and the like, and the phenomena of excessive smoke, combustion noise, even resonance and the like occur along with the deterioration of the combustion working condition, so that the service life of the water heater is influenced, and the personal safety of a user is also endangered.
Disclosure of Invention
The utility model provides an intelligent water heater combustion system which can automatically judge the current combustion environment and automatically correct the opening of a proportional valve and the air quantity of a fan to dynamically adjust the air-fuel ratio, and aims to solve the problems that the existing water heater combustion system is difficult to enable gas to be fully combusted, the combustion resonance phenomenon is easy to cause, and the use safety is influenced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a gas heater intelligence combustion system, includes gas heater, still includes the proportional valve and the proportional valve control module of temperature sensor, flow sensor, control gas, temperature sensor is including intaking temperature sensor and leaving water temperature sensor, input temperature sensor sets up on water heater inlet pipe way, it sets up on water heater outlet pipe way to go out water temperature sensor and flow sensor, proportional valve control module output control proportional valve opening. The temperature sensor and the flow sensor respectively monitor the water inlet temperature and the water outlet temperature of the current water heater and the current water flow to calculate the current hot water yield and the actual heat value. Based on the hot water yield, the environment of the current combustion is automatically determined, and the opening of the proportional valve is automatically corrected to achieve the optimal air-fuel ratio, so as to prolong the service life of the appliance.
Preferably, the proportional valve control module comprises an input module, a filtering module, a comparing module and an output module, wherein an input signal enters from the input module and is filtered and converted into a voltage signal through the filtering module, and the voltage signal is compared with a feedback value through the comparing module and then is output as a proportional valve current through the output module. The combustion problems of different gas heating values, different altitude atmospheric pressures, and insufficient gas pressure in the installation environment and peak periods are automatically solved.
The wind driven generator control system further comprises a wind driven generator control module, and the wind driven generator control module adopts shaft power control. The following control relationship is satisfied:
I_HP = F_HP + B_HP；
wherein, I _ HP is the motor power; f _ HP is friction loss power; b _ HP is the net output power, i.e., shaft power. When the air density is reduced and the input or output power of the motor is not changed, the rotating speed can be naturally increased, and the loss power is reduced; at high altitude, the atmospheric pressure becomes low, and the rotating speed of the fan is automatically increased due to the fact that the air density becomes low; the rotating speed can be naturally increased when the pressure loss is caused, such as the length of an exhaust pipe is increased or the wind pressure is higher than the wind blockage condition; actual heat input quantity > designed heat input quantity, and the rotating speed can be naturally increased; the rotating speed can be naturally reduced without burning at the same power, so that the noise is reduced; when the secondary heat exchanger is installed, the rotating speed of the fan can be automatically increased due to the need of maintaining fixed combustion air quantity.
Preferably, the input signal is a PWM signal. PWM input signal enters from the input module and is filtered and converted into voltage signal through the filtering module, and the voltage signal is compared with the feedback value through the comparison module and then is output as proportional valve current through the output module. The PWM input signal is converted into a voltage signal after passing through the filtering module, and the voltage signal is compared with a proportional valve current feedback value through the comparing module to drive the output module to output constant proportional valve current.
Preferably, the input module includes a PWM input signal, the filtering module includes a resistor R417, a resistor R418, a resistor R419, and a capacitor C404, the PWM input signal is connected to one end of the resistor R417, the other end of the resistor R417 is connected to one end of the resistor R418, the other end of the resistor R418 is connected to one end of the resistor R419, the other end of the resistor R419 is grounded, one end of the capacitor C404 is connected to the other end of the resistor R417, the other end of the capacitor C404 is grounded, and the other end of the resistor R418 is further provided with an output end of the filtering module.
Preferably, the comparison module comprises a comparator U401A, a proportional valve current acquisition signal PSV _ FBI, a resistor R422, a resistor R423, a resistor R424, a resistor R425, a capacitor C405 and a capacitor C408, the output end of the filter module is connected with the positive input end of the comparator U401A, the proportional valve current acquisition signal PSV _ FBI is connected with one end of the resistor R422, the other end of the resistor R422 is connected with one end of the resistor R423, the other end of the resistor R423 is connected with the negative input end of the comparator U401A, one end of the resistor R424 is connected with the other end of the resistor R423, the resistor R425 is connected with two ends of the resistor R424 in parallel, the power supply end of the comparator U401A is connected with 12V voltage, and the output end of the comparator U401A is connected with the input end of the output module.
Preferably, the output module comprises a triode Q405, a triode C406, an electrolytic capacitor E403, a capacitor C406, a resistor R420, a resistor R421, a proportional valve positive output end and a proportional valve negative output end, the input end of the output module is connected with one end of the resistor R420, the other end of the resistor R420 is connected with the base of the triode Q405, the collector of the triode Q405 is connected with the proportional valve negative output end, the emitter of the triode Q405 is connected with the collector of the triode Q406, the emitter of the triode Q406 is connected with the negative input end of the comparator U401A, the collector of the triode Q406 is connected with the proportional valve negative output end, the proportional valve positive output end is connected with the 25V power supply, the positive electrode of the electrolytic capacitor E403 is connected with the proportional valve positive output end, the negative electrode of the electrolytic capacitor E403 is connected with the proportional valve negative output end, and the electrolytic capacitor C406 is connected in parallel with two ends of the electrolytic capacitor E403.
The intelligent combustion system of the water heater comprises the following control steps:
step S1: during the combustion process, the current hot water yield and the actual heat value phi s are calculated according to the water flow sensor and the temperature sensor, and phi s = Hs × Vs
Wherein, Φ s: designing the heat quantity of the fuel gas, Hs: calorific value of gas, Vs: the gas flow rate;
step S2: generating a current curve of the current hot water yield and a current curve of a proportional valve by taking the hot water yield and the current curve of the proportional valve sampled by standard gas as references;
step S3: and comparing the current hot water yield with the preset hot water yield, and if the current hot water yield is different from the preset hot water yield, adjusting the current of the proportional valve according to the current curve of the hot water yield and the current curve of the proportional valve generated in the step S2 by adopting PID.
In conclusion, the utility model has the following beneficial effects: the proportional valve control system adopted by the utility model can dynamically adjust the air-fuel ratio according to the actual combustion working condition, can meet the air-fuel ratio requirement of a low-nitrogen emission machine type, and solves the problem of combustion resonance which cannot be solved by domestic manufacturers at present.
Drawings
FIG. 1 is a circuit diagram of a proportional valve control module according to an embodiment of the present invention.
FIG. 2 is a graph of fan speed versus fan power according to an embodiment of the present invention.
FIG. 3 is a graph of hot water production rate versus proportional valve current for an embodiment of the present invention.
In the figure: 1. the device comprises an input module 2, a filtering module 3, a comparing module 4 and an output module.
Detailed Description
The utility model is further described with reference to the following detailed description and accompanying drawings.
Example (b):
an intelligent combustion system of a gas water heater mainly comprises a fan, a fire grate, a water tank, an electromagnetic valve, a temperature sensor and a proportional valve. The intelligent combustion system comprises an intelligent combustion module, a proportional valve and a fan control module; the intelligent combustion module calculates the current hot water yield and the actual heat value according to water flow and temperature, compares the current hot water yield with the preset hot water yield, adjusts gas flow through a proportional valve, and the fan control module adopts shaft power control. The intelligent combustion module adopts a proportional valve control module PID to control and adjust the proportional valve current to adjust the flow. As shown in fig. 1, the proportional valve control module includes an input module 1, a filtering module 2, a comparing module 3, and an output module 4, wherein a PWM input signal enters from the input module 1 and is filtered and converted into a voltage signal by the filtering module 2, and the voltage signal is compared with a feedback value by the comparing module 3 and then is output as a proportional valve current by the output module 4.
The fan control module meets the following control relation:
I_HP = F_HP + B_HP；
wherein, I _ HP is the motor power; f _ HP is friction loss power; b _ HP is the net output power, i.e., shaft power. When the air density is reduced and the input or output power of the motor is not changed, the rotating speed is naturally increased because the loss power is reduced; at high altitude, the atmospheric pressure becomes low, and the rotating speed of the fan is automatically increased due to the fact that the air density becomes low; the rotating speed can be naturally increased when the pressure loss is caused, such as the length of an exhaust pipe is increased or the wind pressure is higher than the wind blockage condition; actual heat input quantity > designed heat input quantity, and the rotating speed can be naturally increased; the rotating speed can be naturally reduced without burning at the same power, so that the noise is reduced; when the secondary heat exchanger is installed, the rotating speed of the fan can be automatically increased because the fixed combustion air quantity needs to be maintained. As shown in fig. 2, the curve of the fan speed and the fan power: in the figure, A: the fan power and rotating speed curve under the shaft power control blocking state is provided; b: controlling a fan power and rotating speed curve in a blocked state by conventional power; c: a fan power and rotation speed curve of normal combustion; d: fan power and speed curves in the unburned state.
The input module 1 comprises a PWM input signal, the filtering module 2 comprises a resistor R417, a resistor R418, a resistor R419 and a capacitor C404, the PWM input signal is connected with one end of the resistor R417, the other end of the resistor R417 is connected with one end of the resistor R418, the other end of the resistor R418 is connected with one end of the resistor R419, the other end of the resistor R419 is grounded, one end of the capacitor C404 is connected with the other end of the resistor R417, the other end of the capacitor C404 is grounded, and the other end of the resistor R418 is also provided with an output end of the filtering module 2.
The comparison module 3 comprises a comparator U401A, a proportional valve current acquisition signal PSV _ FBI, a resistor R422, a resistor R423, a resistor R424, a resistor R425, a capacitor C405 and a capacitor C408, the output end of the filter module 2 is connected with the positive input end of the comparator U401A, the proportional valve current acquisition signal PSV _ FBI is connected with one end of the resistor R422, the other end of the resistor R422 is connected with one end of the resistor R423, the other end of the resistor R423 is connected with the negative input end of the comparator U401A, one end of the resistor R424 is connected with the other end of the resistor R423, the resistor R425 is connected with two ends of the resistor R424 in parallel, the power supply end of the comparator U401A is connected with 12V voltage, and the output end of the comparator U401A is connected with the input end of the output module 4. PSV _ FBI is the proportional valve current signal sampled by the MCU.
The output module 4 comprises a triode Q405, a triode C406, an electrolytic capacitor E403, a capacitor C406, a resistor R420, a resistor R421, a proportional valve positive output end and a proportional valve negative output end, the input end of the output module 4 is connected with one end of the resistor R420, the other end of the resistor R420 is connected with the base electrode of a triode Q405, the collector electrode of the triode Q405 is connected with the proportional valve negative output end, the emitter electrode of the triode Q405 is connected with the collector electrode of the triode Q406, the emitter electrode of the triode Q406 is connected with the negative input end of a comparator U401A, the collector electrode of the triode Q406 is connected with the proportional valve negative output end, the proportional valve positive output end is connected with a 25V power supply, the positive electrode of the electrolytic capacitor E403 is connected with the proportional valve positive output end, the negative electrode of the electrolytic capacitor E403 is connected with the proportional valve negative output end, and the electrolytic capacitor C406 is connected in parallel with two ends of the electrolytic capacitor E403. PSV _ PWM is a PWM input signal, which is filtered by a resistor R417 and a capacitor C404 and then converted into a voltage signal, which is compared by a comparator U401A and a proportional valve current feedback value to drive transistors Q405 and Q406, thereby outputting a constant proportional valve current.
The control flow of the intelligent combustion system comprises the following steps:
step S1: igniting and burning;
step S2: in the combustion process, calculating the current hot water yield and the actual heat value phi s according to a water flow sensor and a temperature sensor, wherein phi s = Hs Vs;
step S3: generating a current curve of the current hot water yield and a current curve of a proportional valve by taking the hot water yield and the current curve of the proportional valve sampled by standard gas as references;
step S4: comparing the current hot water yield with the preset hot water yield, if the current hot water yield is different from the preset hot water yield, adopting PID (proportion integration differentiation) to adjust the current of the proportional valve according to the current curve of the current hot water yield and the current curve of the proportional valve generated in the step S3, if the current hot water yield is greater than the upper limit of the preset hot water yield, reducing the output of the proportional valve, and if the current hot water yield is less than the lower limit of the preset hot water yield, increasing the output of the proportional valve. The hot water yield versus proportional valve current curve is shown in fig. 3: wherein A0: sampled hot water yield and proportional valve current curves under standard gas; a +1, A + 2: the hot water yield and the proportional valve current curve with the heat value smaller than that of the standard fuel gas are obtained by automatic calculation of software; a-1, A-2: the hot water yield and the proportional valve current curve with the heat value larger than that of the standard fuel gas are obtained by software automatic calculation.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.
Although the terms air-fuel ratio, gas heating value, proportional valve, hot water production rate, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (5)
1. The utility model provides a gas heater intelligence combustion system, includes gas heater, characterized by, still includes temperature sensor, flow sensor, the proportional valve and the proportional valve control module of control gas, temperature sensor is including intaking temperature sensor and leaving water temperature sensor, it sets up on water heater inlet tube way to intake temperature sensor, it sets up on water heater outlet tube way to go out water temperature sensor and flow sensor, proportional valve control module output control proportional valve aperture, include proportional valve control module includes input module, filtering module, comparison module and output module, and input signal gets into from input module and converts voltage signal through filtering module filtering, and voltage signal is the proportional valve electric current through output module output after comparison module compares with the feedback value.
2. The intelligent combustion system of claim 1, wherein the input signal is a PWM signal.
3. The intelligent combustion system of claim 2, wherein the input module comprises a PWM input signal, the filtering module comprises a resistor R417, a resistor R418, a resistor R419 and a capacitor C404, the PWM input signal is connected to one end of the resistor R417, the other end of the resistor R417 is connected to one end of the resistor R418, the other end of the resistor R418 is connected to one end of the resistor R419, the other end of the resistor R419 is grounded, one end of the capacitor C404 is connected to the other end of the resistor R417, the other end of the capacitor C404 is grounded, and the other end of the resistor R418 is further provided with an output end of the filtering module.
4. The intelligent combustion system of the gas water heater as claimed in claim 3, wherein the comparison module comprises a comparator U401A, a proportional valve current acquisition signal PSV _ FBI, a resistor R422, a resistor R423, a resistor R424, a resistor R425, a capacitor C405 and a capacitor C408, the output end of the filter module is connected with the positive input end of the comparator U401A, the proportional valve current acquisition signal PSV _ FBI is connected with one end of the resistor R422, the other end of the resistor R422 is connected with one end of the resistor R423, the other end of the resistor R423 is connected with the negative input end of the comparator U401A, one end of the resistor R424 is connected with the other end of the resistor R423, the resistor R425 is connected in parallel with two ends of the resistor R424, the power supply terminal of the comparator U401A is connected with 12V voltage, and the output terminal of the comparator U401A is connected with the input terminal of the output module.
5. The intelligent combustion system of a gas water heater as claimed in claim 1, the output module comprises a triode Q405, a triode C406, an electrolytic capacitor E403, a capacitor C406, a resistor R420, a resistor R421, a proportional valve positive output end and a proportional valve negative output end, the input end of the output module is connected with one end of the resistor R420, the other end of the resistor R420 is connected with the base electrode of a triode Q405, the collector electrode of the triode Q405 is connected with the proportional valve negative output end, the emitter electrode of the triode Q405 is connected with the collector electrode of the triode Q406, the emitter electrode of the triode Q406 is connected with the negative input end of a comparator U401A, the collector electrode of the triode Q406 is connected with the proportional valve negative output end, the proportional valve positive output end is connected with a 25V power supply, the positive electrode of the electrolytic capacitor E403 is connected with the proportional valve positive output end, the negative electrode of the electrolytic capacitor E403 is connected with the proportional valve negative output end, and the electrolytic capacitor C406 is connected with two ends of the electrolytic capacitor E403 in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121836193.6U CN216744953U (en) | 2021-08-06 | 2021-08-06 | Intelligent combustion system of gas water heater |
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| CN202121836193.6U CN216744953U (en) | 2021-08-06 | 2021-08-06 | Intelligent combustion system of gas water heater |
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| CN216744953U true CN216744953U (en) | 2022-06-14 |
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