Self-adaptive correction method of gas water heater

Abstract

The invention relates to the technical field of gas water heating equipment, and discloses a self-adaptive correction method of a gas water heater, which comprises the following steps of: correcting fan normal current gear values of a first load gear and a second load gear based on a correction strategy; a first current change rate is obtained based on the fan normal current gear value before and after the first load gear correction; based on the fan normal current gear values before and after the second load gear correction, a second current change rate is obtained; obtaining an intermediate current change rate corresponding to the intermediate load gear based on the first current change rate and the second current change rate; and correcting the fan blocking current gear value corresponding to the intermediate load gear based on the intermediate current change rate corresponding to the intermediate load gear. According to the method, the conditions that the gas water heater is blocked and smoke exceeds the standard due to fan individual difference and resistance deviation of different whole machine systems can be effectively avoided, and safe and stable operation of the gas water heater is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of gas-fired water heaters, and in particular to an adaptive correction method for gas-fired water heaters. Background Technology

[0002] With the upgrading of EU standards for gas-fired water heaters, the requirements for nitrogen oxide emissions and clogging of flue gas at different load points are becoming increasingly stringent. Publication number CN111964269B discloses an automatic determination and control method for the fan speed accuracy of a gas water heater, and a gas water heater itself. This method only requires correction of the fan speed under maximum and minimum heat loads; for other load ranges, an algorithm is used for correction. This improves upon the long time consumption associated with existing technologies that correct the fan speed across the entire load range. However, this method does not compensate for fan clogging conditions. Due to individual fan differences and variations in the resistance of different entire system units, the overall performance of the gas water heater is affected, potentially leading to deteriorated combustion conditions and excessive flue gas emissions. Summary of the Invention

[0003] The technical problem solved by this invention is to provide an adaptive correction method for gas water heaters, which effectively solves the technical problems of gas water heater blockage and excessive flue gas caused by individual differences in fans and different resistance deviations in the whole system.

[0004] The above-mentioned technical problems are solved by the following technical solutions: An adaptive correction method for a gas water heater, wherein the gas water heater stores a first load level, a second load level, and an intermediate load level between the first and second load levels, and stores a normal fan current level value and a fan blockage current level value corresponding to each load level; the normal fan current level value is a preset operating current of the fan in a non-blocked state; the fan blockage current level value is a preset operating current of the fan in a blocked state; the gas water heater has a preset correction strategy for correcting the normal fan current level value; the method includes: The normal current setting value of the fan at the first load setting and the normal current setting value of the fan at the second load setting are corrected based on the correction strategy. Based on the normal current level values ​​of the fan before and after the first load level correction, the first current change rate corresponding to the first load level is obtained. Based on the normal current level values ​​of the fan before and after the second load level correction, the second current change rate corresponding to the second load level is obtained. Based on the first current change rate and the second current change rate, the intermediate current change rate corresponding to the intermediate load level is obtained; Based on the intermediate current change rate corresponding to the intermediate load level, the fan blockage current level value corresponding to the intermediate load level is corrected.

[0005] Compared with the prior art, the adaptive correction method for gas water heaters described in this invention has the following advantages: The gas water heater has preset values ​​for the normal fan current and the fan blockage current at each load level, as well as a preset correction strategy for correcting the normal fan current value. When the gas water heater's fan enters the adaptive correction mode, the gas water heater is controlled to enter the first load level, and under stable combustion conditions, the normal fan current value at the first load level is corrected according to the preset correction strategy; and the gas water heater is controlled to enter the second load level, and under stable combustion conditions, the normal fan current value at the second load level is corrected according to the preset correction strategy. The first current change rate corresponding to the first load level is obtained from the normal fan current values ​​at the first load level before and after correction; and the second current change rate is obtained from the normal fan current values ​​at the second load level before and after correction. Then, the intermediate current change rate corresponding to the intermediate load level is calculated based on the first and second current change rates. Finally, based on the rate of change of intermediate current corresponding to the intermediate load level, the fan blockage current level value corresponding to the intermediate load level is corrected, thereby obtaining the fan blockage current correction value corresponding to each load level.

[0006] By adaptively adjusting the fan to correct the fan blockage current value corresponding to each load setting, the gas water heater can operate according to the fan blockage current value at each load setting when the fan is blocked. This allows for more precise control of the fan current value under blockage conditions across the entire load range of the gas water heater, and the fan's operating status can be controlled based on the current value, improving the energy efficiency of the gas water heater. This invention eliminates the need for adjusting the fan to each load setting for correction, effectively reducing the time required to correct the fan's normal current value and the blockage current value for each load setting, thus improving fan correction efficiency. Furthermore, the adaptive correction method provided by this invention is applicable to all types of fans, avoiding blockages and excessive flue gas emissions caused by individual fan differences and variations in the overall system resistance, ensuring the safe and stable operation of the gas water heater.

[0007] In one embodiment, the first load setting is the minimum load setting, and the second load setting is the maximum load setting.

[0008] In one embodiment, obtaining the first current change rate corresponding to the first load level based on the normal current level value of the fan before and after the first load level correction includes: The ratio of the fan normal current level after the first load level correction to the fan normal current level before the first load level correction is taken as the first current change rate. The process of obtaining the second current change rate corresponding to the second load level based on the normal current level values ​​of the fan before and after the second load level correction includes: The ratio of the fan normal current setting value after the second load setting correction to the fan normal current setting value before the second load setting correction is taken as the second current change rate.

[0009] In one embodiment, obtaining the intermediate current change rate corresponding to the intermediate load level based on the first current change rate and the second current change rate includes: Based on the difference between the first current change rate and the second current change rate, and the number of intermediate load levels, the difference in current change rate between adjacent load levels is obtained. Based on the difference in the rate of change of current and the number of load levels between the intermediate load level and the first load level or the second load level, the intermediate current rate of change corresponding to the intermediate load level is determined.

[0010] In one embodiment, the difference in the rate of change of current between adjacent load levels is calculated using the following formula:

[0011] in, This represents the difference in the rate of change of current. The first rate of change of current; is the second current change rate; N is the number of intermediate load levels.

[0012] In one embodiment, the rate of change of the intermediate current corresponding to the intermediate load level is calculated using the following formula:

[0013] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. X represents the difference in current change rate; X is the number of load levels between the calculated intermediate load level and the first load level. The rate of change of the first gear value; or

[0014] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. Y represents the difference in current change rate; Y is the number of load levels between the calculated intermediate load level and the second load level. This represents the rate of change for the second-tier value.

[0015] In one embodiment, the step of correcting the fan blockage current level value corresponding to the intermediate load level based on the intermediate current change rate corresponding to the intermediate load level includes: The fan blockage current value of the intermediate load setting is calculated according to the corresponding intermediate current change rate to obtain the fan blockage current correction value corresponding to the intermediate load setting. The fan blockage current correction value of the intermediate load setting is stored as the new fan blockage current setting value of the intermediate load setting. The correction value for the fan blockage current at the intermediate load level is calculated using the following formula:

[0016] in, This represents the rate of change of the intermediate current at the intermediate load level. This is the fan blockage current setting for the intermediate load position; This is the correction value for the fan blockage current at the intermediate load setting.

[0017] In one embodiment, the correction strategy includes: The gas water heater is controlled to operate at the target corrected load level, and the operating current of the fan is controlled to be the normal current level value of the fan corresponding to the target corrected load level, and the current speed of the fan is obtained in real time. Determine whether the current speed is within the preset speed range corresponding to the target corrected load gear; If the current speed is outside the preset speed range, the operating current of the fan is adjusted until the current speed is adjusted to the preset speed range, and the adjusted operating current is used as the new normal current level value of the fan for the target corrected load level. In the correction strategy, the wind turbine is controlled by a constant current control method.

[0018] In one embodiment, the method further includes: After sequentially correcting the fan normal current value of the first load level and the fan normal current value of the second load level based on the correction strategy, the gas water heater is controlled to work at the first corrected load level and the working current of the fan is controlled to be the fan normal current value corresponding to the first corrected load level, and the current speed of the fan is obtained in real time. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the previously corrected load setting; If the current speed is outside the preset speed range corresponding to the previously corrected load level, then the normal current level value of the fan is corrected again based on the correction strategy. If the current speed is within the preset speed range corresponding to the first corrected load setting, then the gas water heater is controlled to work at the second corrected load setting, and the working current of the fan is controlled to be the normal current setting value of the fan corresponding to the second corrected load setting. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the later corrected load setting; If the current speed is outside the preset speed range corresponding to the subsequently corrected load level, then the normal current level value of the fan is corrected again based on the correction strategy. If the number of corrections to the normal current setting of the fan at the load setting exceeds a preset number, the gas water heater will be controlled to stop working and a fault will be reported.

[0019] In one embodiment, the method further includes: Based on the intermediate current change rate corresponding to the intermediate load level, the normal current level value of the fan at the intermediate load level is corrected. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a flowchart illustrating an adaptive correction method for a gas water heater according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a gas water heater according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating an adaptive correction method for a gas water heater according to another embodiment of the present invention. Figure 4 This is a flowchart illustrating an adaptive correction method for a gas water heater according to another embodiment of the present invention. Figure 5 This is a flowchart illustrating an adaptive correction method for a gas water heater according to another embodiment of the present invention. Figure 6 This invention provides a line graph showing the relationship between the current setting and the rotational speed of a slow-moving fan under different operating conditions. Figure 7 This invention provides a line graph showing the relationship between the fan current setting and the speed of a fast-running fan under different operating conditions. Figure 8 This is a schematic diagram of the structure of a wind turbine adaptive correction device according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a gas water heater according to another embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Fan; 2. Water flow sensor; 3. Inlet water temperature sensor; 4. Controller; 5. Heat exchanger; 6. Burner; 7. Outlet water temperature sensor; 8. Gas valve assembly; 9. Inlet water pipe; 10. Outlet water pipe; 11. Gas pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figure 2As shown, this embodiment of the invention provides a gas water heater, including: a fan 1, a water flow sensor 2, an inlet water temperature sensor 3, a controller 4, a heat exchanger 5, a burner 6, an outlet water temperature sensor 7, a gas valve assembly 8, an inlet pipe 9, an outlet pipe 10, and a gas pipe 11. The burner 6, heat exchanger 5, and fan 1 are connected sequentially; the burner 6 is connected to the gas pipe 11, and the gas valve assembly 8 is provided on the gas pipe 11 for controlling the on / off of the gas; the inlet pipe 9 and outlet pipe 10 are respectively connected to the heat exchanger 5; the inlet pipe 9 is equipped with an inlet water temperature sensor 3 for detecting the inlet water temperature and a water flow sensor 2 for detecting the inlet water flow rate. The controller 4 is electrically connected to the fan 1, water flow sensor 2, inlet water temperature sensor 3, outlet water temperature sensor 7, and gas valve assembly 8. Water can flow into heat exchanger 5 from the inlet on inlet pipe 9, and after being heated by burner 6, the heated water flows out from the outlet on outlet pipe 10 and finally flows to the water terminal.

[0026] According to embodiments of the present invention, such as Figure 1 As shown, on one hand, an adaptive correction method for a gas water heater is provided. The gas water heater stores a first load level, a second load level, and an intermediate load level between the first load level and the second load level, and stores the normal fan current level value and the fan blockage current level value corresponding to each load level. The normal fan current level value is the preset operating current of the fan in a non-blocked state; the fan blockage current level value is the preset operating current of the fan in a blocked state; the gas water heater has a preset correction strategy for correcting the normal fan current level value.

[0027] The method includes the following steps: Step S100: Correct the normal current level value of the fan at the first load level and the normal current level value of the fan at the second load level based on the correction strategy. Step S200: Based on the normal current level values ​​of the fan before and after the first load level correction, obtain the first current change rate corresponding to the first load level. Step S300: Based on the normal current level values ​​of the fan before and after the second load level correction, obtain the second current change rate corresponding to the second load level. Step S400: Based on the first current change rate and the second current change rate, obtain the intermediate current change rate corresponding to the intermediate load level; Step S500: Based on the rate of change of intermediate current corresponding to the intermediate load level, correct the fan blockage current level value corresponding to the intermediate load level.

[0028] In step S100, the gas water heater stores a first load setting, a second load setting, and an intermediate load setting between the first and second load settings. It also stores the normal fan current setting and the fan blockage current setting corresponding to each load setting, as well as a preset correction strategy for correcting the normal fan current setting. When the gas water heater's fan enters adaptive correction mode, it controls the gas water heater to enter the first load setting and, under stable combustion conditions, corrects the normal fan current setting value for the first load setting according to the preset correction strategy; similarly, it controls the gas water heater to enter the second load setting and, under stable combustion conditions, corrects the normal fan current setting value for the second load setting according to the preset correction strategy. When controlling the fan to enter either the first or second load setting, it is necessary to ensure stable combustion of the gas water heater, thereby ensuring the accuracy of the correction of the normal fan current setting values ​​for both the first and second load settings. Among them, stable combustion is used to characterize the gas water heater's relatively constant operating temperature, relatively constant outlet water temperature, and no change in combustion state; the relatively constant operating temperature indicates that the gas water heater's operating temperature can be maintained within a relatively stable range without significant fluctuations or drastic changes; the relatively constant outlet water temperature indicates that the gas water heater's outlet water temperature can be maintained within a relatively stable range without significant fluctuations or drastic changes.

[0029] Furthermore, the first load setting is the minimum load setting, and the second load setting is the maximum load setting. The minimum load setting is the fan setting corresponding to the minimum heat output power of the gas water heater; the maximum load setting is the fan setting corresponding to the maximum heat output power of the gas water heater.

[0030] Step S200 specifically includes: using the ratio of the fan normal current level value after the first load level correction to the fan normal current level value before the first load level correction as the first current change rate.

[0031] Specifically, the first current change rate corresponding to the first load setting can be calculated by comparing the normal current setting value of the fan after correction at the first load setting with the normal current setting value before correction at the first load setting. This first current change rate reveals the extent to which the gas water heater's normal current setting value is affected when corrected at the first load setting, thus providing a basis for subsequent analysis and adjustments.

[0032] Furthermore, the formula for calculating the first current change rate corresponding to the first load level is as follows:

[0033] in, The first rate of change of current, This is the normal current setting value for the fan after correction for the first load setting; This is the normal current setting value of the fan before the first load setting correction.

[0034] Step S300 specifically includes: using the ratio of the fan normal current level value after the second load level correction to the fan normal current level value before the second load level correction as the second current change rate.

[0035] Specifically, the second current change rate corresponding to the second load setting can be calculated by comparing the normal fan current value after correction at the second load setting with the normal fan current value before correction. Similarly, the second current change rate can be used to understand the impact of correcting the gas water heater at the second load setting on the normal fan current value, thus providing a basis for subsequent analysis and adjustments.

[0036] The formula for calculating the second current change rate corresponding to the second load setting is as follows:

[0037] in, The second rate of change of current. This is the normal current setting value for the fan after correction for the second load setting. This is the normal current setting value of the fan before the second load setting correction.

[0038] In step S400, as Figure 3 As shown, the specific steps include: Step S410: Based on the difference between the first current change rate and the second current change rate, and the number of intermediate load segments, obtain the difference in current change rate between adjacent load segments. Step S420: Based on the difference in current change rate and the number of load levels between the intermediate load level and the first or second load level, determine the intermediate current change rate corresponding to the intermediate load level.

[0039] Specifically, first, the difference between the first and second current change rates is calculated. Then, based on this difference and the number of intermediate load levels, the difference in current change rates between adjacent load levels is calculated. Finally, based on the difference in current change rates and the number of load levels between the intermediate load level and the first load level, the intermediate current change rate corresponding to the intermediate load level is calculated. Alternatively, after calculating the difference in current change rates between adjacent load levels, the intermediate current change rate corresponding to the intermediate load level is calculated using the difference in current change rates and the number of load levels between the intermediate load level and the second load level. By using the intermediate current change rate corresponding to the intermediate load level, the fan current level value for each load level can be reasonably adjusted to ensure that the fan operates stably with an appropriate current level value under different load levels, thereby ensuring the overall performance of the gas-fired water heater and enabling it to better adapt to various actual operating conditions.

[0040] Furthermore, the difference in the rate of change of current between adjacent load taps is calculated using the following formula:

[0041] in, This represents the difference in the rate of change of current. The first rate of change of current; is the second current change rate; N is the number of intermediate load levels.

[0042] The rate of change of intermediate current corresponding to the intermediate load level is calculated using the following formula:

[0043] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. X represents the difference in current change rate; X is the number of load levels between the calculated intermediate load level and the first load level. This represents the rate of change of the first gear value.

[0044] Alternatively, the rate of change of current corresponding to the load setting can be calculated using the following formula:

[0045] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. Y represents the difference in current change rate; Y is the number of load levels between the calculated intermediate load level and the second load level. This represents the rate of change for the second-tier value.

[0046] In step S500, as Figure 4As shown, the specific steps include: Step S510: Calculate the fan blockage current value of the intermediate load position according to the corresponding intermediate current change rate to obtain the fan blockage current correction value corresponding to the intermediate load position. Step S520: Store the fan blockage current correction value of the intermediate load level as the new fan blockage current level value of the intermediate load level. The correction value for the fan blockage current at the intermediate load setting is calculated using the following formula:

[0047] in, This represents the rate of change of the intermediate current at the intermediate load level. This is the fan blockage current setting for the intermediate load position; This is the correction value for the fan blockage current at the intermediate load setting.

[0048] Specifically, after obtaining the intermediate current change rate at the intermediate load level, the product of the intermediate current change rate at the intermediate load level and the fan blockage current level value corresponding to the intermediate load level is calculated to obtain the fan blockage current correction value corresponding to the intermediate load level. This correction value is stored as the new fan blockage current level value for the intermediate load level, so that when the fan becomes blocked and is in the intermediate load level, it can be controlled to operate with the fan blockage current correction value corresponding to the intermediate load level.

[0049] During the manufacturing stage, the fan is adaptively adjusted to correct the fan blockage current value corresponding to each load setting. This allows the gas water heater to operate according to the fan blockage current value at each load setting when the fan is blocked, thus enabling more precise control of the fan current value under blockage conditions across the entire load range of the gas water heater. The operating status of the fan can be controlled based on the current value, improving the energy efficiency of the gas water heater. This invention eliminates the need to adjust the fan to each load setting for correction, effectively reducing the time required to correct the fan's normal current value and the blockage current value for each load setting, thereby improving fan correction efficiency. Furthermore, the adaptive correction method provided by this invention is applicable to various types of fans, avoiding blockages and excessive flue gas emissions caused by individual fan differences and variations in the overall system resistance, ensuring the safe and stable operation of the gas water heater.

[0050] like Figure 5 As shown, in one embodiment, the correction strategy includes the following steps: Step 010: Control the gas water heater to operate at the target corrected load level and control the fan's operating current to the normal fan current level corresponding to the target corrected load level, and obtain the fan's current speed in real time. Step 020: Determine whether the current speed is within the preset speed range corresponding to the target corrected load gear; Step 030: If the current speed is outside the preset speed range, adjust the fan's operating current until the current speed is adjusted to the preset speed range, and use the adjusted operating current as the new normal current setting value of the fan for the target corrected load setting. In the correction strategy, the wind turbine is controlled by a constant current control method.

[0051] In this embodiment, the fan is controlled using a constant current control method in the correction strategy, meaning that the fan's operating current is kept constant when the fan is in operation. Specifically, the correction strategy includes: when the gas water heater is operating at the target correction load level, controlling the fan's operating current to the normal current level corresponding to the target correction load level, and then acquiring the fan's current speed in real time. It then determines whether the fan's current speed is within the preset speed range corresponding to the target correction load level; where the preset speed range indicates that when the gas water heater is operating at the target correction load level and the fan speed is within the preset speed range, the fan's operating state basically meets the requirements of the gas water heater under the current operating conditions.

[0052] If the current speed is outside the preset speed range, the fan's operating current needs to be adjusted. By changing the input current, the fan's electromagnetic torque can be altered, thus changing the fan's speed. The current fan speed is adjusted to the preset speed range, and the adjusted operating current is recorded. This adjusted operating current is used as the new normal fan current setting value for the target load setting. The new normal fan current setting value for the target load setting reflects the operating current required by the fan to meet the preset load combustion stability requirements of the gas water heater during actual operation. This facilitates subsequent adjustments to the fan blockage current setting values ​​for each load setting based on the normal fan current setting value.

[0053] In one embodiment, the method further includes: After successively correcting the fan normal current level value of the first load level and the fan normal current level value of the second load level based on the correction strategy, the gas water heater is controlled to work at the first corrected load level and the fan operating current is controlled to be the fan normal current level value corresponding to the first corrected load level, and the current speed of the fan is obtained in real time. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the previously corrected load setting; If the current speed is outside the preset speed range corresponding to the previously corrected load setting, the normal current setting value of the fan will be corrected again based on the correction strategy. If the current speed is within the preset speed range corresponding to the first corrected load setting, the gas water heater is controlled to work at the second corrected load setting, and the working current of the fan is controlled to be the normal current setting value of the fan corresponding to the second corrected load setting. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the later corrected load setting; If the current speed is outside the preset speed range corresponding to the load level after correction, the normal current level value of the fan will be corrected again based on the correction strategy. If the number of corrections to the normal current setting of the fan at the load setting exceeds the preset number, the gas water heater will stop working and report a fault.

[0054] In this embodiment, after correcting the fan normal current setting value for the first load setting and the fan normal current setting value for the second load setting according to the correction strategy, the gas water heater is controlled to operate at the first corrected load setting, and the fan's operating current is controlled to be the fan normal current setting value corresponding to the first corrected load setting. For example, if the fan normal current setting value for the first load setting is corrected first, then when the gas water heater is operating at the first corrected load setting, the fan's operating current is controlled to be the fan normal current setting value corresponding to the first corrected load setting, and the fan's current speed is obtained in real time.

[0055] After the gas water heater achieves stable combustion, it determines whether the current speed of the fan is within the preset speed range corresponding to the first corrected load setting. If the current speed is outside the preset speed range, the fan's normal current setting value is adjusted again based on the correction strategy until the gas water heater is at the first corrected load setting and the fan's operating current is within the preset speed range corresponding to the first corrected load setting. If the current speed of the fan is within the preset speed range corresponding to the first corrected load setting, the gas water heater is controlled to operate at the second corrected load setting, and the fan's operating current is controlled to the normal current setting value corresponding to the second corrected load setting.

[0056] After the gas water heater is in stable combustion, it is determined whether the current speed of the fan is within the preset speed range corresponding to the second corrected load setting. If the current speed is outside the preset speed range, the normal current setting value of the fan is adjusted again based on the correction strategy until the gas water heater is in the second corrected load setting and the fan's operating current is within the preset speed range corresponding to the second corrected load setting.

[0057] When correcting the normal current setting value of the fan at the load setting, the number of corrections is recorded simultaneously. If, after multiple corrections, the current fan speed consistently fails to fall directly into the preset speed range when the gas water heater is operating at the load setting and burning stably, causing the number of corrections for the normal current setting value of the fan to exceed the preset number, the gas water heater will stop operating, and a fault notification will be generated to facilitate fault analysis of the fan. The preset number of corrections can be 2, 3, 4, etc., and can be set according to actual usage needs; no specific limitation is made here.

[0058] In one embodiment, the method further includes: correcting the normal current setting value of the fan at the intermediate load setting based on the intermediate current change rate corresponding to the intermediate load setting.

[0059] In this embodiment, the normal current value of the fan at the intermediate load level is calculated according to the corresponding intermediate current change rate to obtain the corrected value of the normal current of the fan at the intermediate load level; then, the corrected value of the normal current of the fan at the intermediate load level is stored as the new normal current value of the fan at the intermediate load level for subsequent use.

[0060] Furthermore, the normal current correction value for the fan at the intermediate load level is calculated using the following formula:

[0061] in, This represents the rate of change of the intermediate current at the intermediate load level. This is the normal current setting value for the fan at the intermediate load setting; This is the normal current correction value for the fan at the intermediate load setting.

[0062] By calculating the normal current correction value of the fan at the intermediate load level, without adjusting the current load level of the fan to any other load level except the first and second load levels, the normal current correction value of the fan at the load level can be obtained, saving a lot of time for subsequent fan correction.

[0063] The present invention further describes the above embodiments in light of the actual operating conditions of different fans.

[0064] Table 1

[0065] See Table 1 for details. Figure 6In Table 1 and the line graph representing "slower-performing fans": Connect the points "A. Standard fan normal current setting and speed" with "① Standard fan blockage current setting and speed" to form a slope K1. This slope K1 represents the best combustion condition for the blockage air distribution on the benchmark product. If, on a product with a slower-performing fan, the blockage current setting values ​​for all load segments have not been corrected, connect the points "C. Slower-performing fan corrected normal current setting and corresponding speed" with "② Slower-performing fan with the same blockage location corresponding to the blockage current setting value" to form a slope K2. Figure 6 As shown, the slope K2 > slope K1. This can lead to the smoke outlet or air inlet being blocked by a little bit, reaching the protection speed, resulting in poor wind resistance. Alternatively, when blocked, the flame may be blown away by the excessive speed, leading to poor combustion conditions and excessive flue gas. After correcting the current setting value of the blocked fan in all load segments, connecting the points "corrected normal current value and corresponding speed of the C slow fan" and "corrected current value and corresponding speed of the ③ slow fan in the same blocked position" forms a slope K3. The slope K3 ≈ slope K1, which means that the combustion conditions at this time will be basically consistent with the "combustion conditions of the blocked process on the benchmark product", thus ensuring good wind resistance and blocked flue gas.

[0066] Table 2

[0067] Combine Table 2 and Figure 7 In Table 2 and the line graph representing "faster fans": Connect the points "A. Standard fan normal current setting and speed" with "① Standard fan blockage current setting and speed" to form a slope K4. This slope K4 represents the best combustion condition for the blockage air distribution on the benchmark product. If, on a fan with a faster speed, the blockage current setting values ​​for all load segments have not been corrected, connect the points "C. Faster fan corrected normal current setting and corresponding speed" with "② Slower fan with the same blockage location corresponding to the blockage current setting value" to form a slope K5. Figure 7As shown, the slope K5 < slope K4, which means that more smoke outlets or air inlets need to be blocked to reach the protection speed. At this time, it may be difficult to reach the blockage protection point, and the combustion cannot get enough oxygen for combustion, resulting in poor combustion conditions and excessive flue gas. After correcting the blockage fan current settings of all load segments, connecting the points of "C-type fast fan correction value and corresponding speed" with "③-type fast fan correction value and corresponding speed" forms a slope K6, which is approximately equal to the slope K4. This means that the combustion conditions at this time will be basically consistent with the "combustion conditions of the blockage process on the benchmark product", thus ensuring good wind resistance and blockage flue gas.

[0068] According to embodiments of the present invention, such as Figure 8 As shown, on the other hand, a fan adaptive correction device is also provided. The gas water heater stores a first load level, a second load level, and an intermediate load level between the first load level and the second load level, and stores the fan normal current level value and the fan blockage current level value corresponding to each load level. The fan normal current level value is the preset operating current of the fan in the non-blocked state; the fan blockage current level value is the preset operating current of the fan in the blocked state; the gas water heater has a preset correction strategy for correcting the fan normal current level value. The device includes: The first correction module 100 is used to correct the normal current level value of the fan at the first load level and the normal current level value of the fan at the second load level based on the correction strategy. The first calculation module 200 is used to obtain the first current change rate corresponding to the first load level based on the normal current level value of the fan before and after the first load level correction. The second calculation module 300 is used to obtain the second current change rate corresponding to the second load level based on the normal current level value of the fan before and after the second load level correction. The third calculation module 400 is used to obtain the intermediate current change rate corresponding to the intermediate load level based on the first current change rate and the second current change rate. The second correction module 500 is used to correct the fan blockage current level value corresponding to the intermediate load level based on the intermediate current change rate corresponding to the intermediate load level.

[0069] In one embodiment, the first computing module 200 includes: The first calculation unit is used to take the ratio of the fan normal current level value after the first load level correction to the fan normal current level value before the first load level correction as the first current change rate. The second calculation module 300 includes: The second calculation unit is used to take the ratio of the fan normal current level value after the second load level correction to the fan normal current level value before the second load level correction as the second current change rate.

[0070] In one embodiment, the third computing module 400 includes: The third calculation unit is used to obtain the difference in current change rate between adjacent load taps based on the difference between the first and second current change rates and the number of intermediate load taps; the difference in current change rate between adjacent load taps is calculated using the following formula:

[0071] in, This represents the difference in the rate of change of current. The first rate of change of current; is the second current change rate; N is the number of intermediate load levels.

[0072] The fourth calculation unit is used to determine the intermediate current change rate corresponding to the intermediate load level based on the difference in current change rate and the number of load levels between the intermediate load level and the first or second load level. The intermediate current change rate corresponding to the intermediate load level is calculated using the following formula:

[0073] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. X represents the difference in current change rate; X is the number of load levels between the calculated intermediate load level and the first load level. The rate of change of the first gear value; or

[0074] in, This represents the calculated rate of change of the intermediate current at the intermediate load level. Y represents the difference in current change rate; Y is the number of load levels between the calculated intermediate load level and the second load level. This represents the rate of change for the second-tier value.

[0075] In one embodiment, the second correction module 500 includes: The first correction unit is used to calculate the fan blockage current level value of the intermediate load level according to the corresponding intermediate current change rate, and obtain the fan blockage current correction value corresponding to the intermediate load level. The first storage unit is used to store the fan blockage current correction value of the intermediate load level as the new fan blockage current level value of the intermediate load level. The correction value for the fan blockage current at the intermediate load setting is calculated using the following formula:

[0076] in, This represents the rate of change of the intermediate current at the intermediate load level. This is the fan blockage current setting for the intermediate load position; This is the correction value for the fan blockage current at the intermediate load setting.

[0077] In one embodiment, it further includes: The control module is used to control the gas water heater to operate at the target corrected load level and control the fan's operating current to the normal fan current level value corresponding to the target corrected load level, and to obtain the fan's current speed in real time. The judgment module is used to determine whether the current speed is within the preset speed range corresponding to the target corrective load gear; If the current speed is outside the preset speed range, adjust the fan's operating current until the current speed is adjusted to the preset speed range, and use the adjusted operating current as the new normal current setting value of the fan for the target corrected load setting; In the correction strategy, the wind turbine is controlled by a constant current control method.

[0078] In one embodiment, the control module includes: The control module is also used to control the gas water heater to work at the first corrected load level and control the working current of the fan to be the fan normal current level corresponding to the first corrected load level after correcting the fan normal current level value of the first load level and the fan normal current level value of the first corrected load level in sequence based on the correction strategy, and to obtain the current speed of the fan in real time. The judgment module is also used to determine whether the current speed is within the preset speed range corresponding to the first corrected load setting after the gas water heater is in stable combustion. If the current speed is outside the preset speed range corresponding to the previously corrected load setting, the normal current setting value of the fan will be corrected again based on the correction strategy. If the current speed is within the preset speed range corresponding to the first corrected load setting, the gas water heater is controlled to work at the second corrected load setting, and the working current of the fan is controlled to be the normal current setting value of the fan corresponding to the second corrected load setting. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the later corrected load setting; If the current speed is outside the preset speed range corresponding to the load level after correction, the normal current level value of the fan will be corrected again based on the correction strategy. The control module is also used to stop the gas water heater and report a fault after the number of corrections to the normal current setting of the fan at the load setting exceeds a preset number.

[0079] In one embodiment, the third computing module 400 further includes: The fifth calculation unit is used to correct the normal current level value of the fan at the intermediate load level based on the intermediate current change rate corresponding to the intermediate load level.

[0080] Figure 9 The diagram shows a structural schematic of an embodiment of a gas water heater provided by the present invention. The specific embodiments of the present invention do not limit the specific implementation of the gas water heater.

[0081] like Figure 9 As shown, the gas water heater may include: a processor 502, a communications interface 504, a memory 506, and a communications bus 508.

[0082] The processor 502, communication interface 504, and memory 506 communicate with each other via communication bus 508. Communication interface 504 is used to communicate with other network elements such as clients or other servers. Processor 502 executes program 510, specifically performing the relevant steps described in the above embodiment of the adaptive correction method for gas water heaters.

[0083] Specifically, program 510 may include program code, which includes computer-executable instructions.

[0084] Processor 502 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The gas water heater may include one or more processors of the same type, such as one or more CPUs; or it may include processors of different types, such as one or more CPUs and one or more ASICs.

[0085] Memory 506 is used to store program 510. Memory 506 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0086] Specifically, program 510 can be called by processor 502 to cause the gas water heater to perform the relevant steps in the above-described adaptive correction method embodiment for gas water heaters.

[0087] Those skilled in the art will understand that Figure 9 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned equipment. For example, a gas water heater may also include... Figure 9 The more or fewer components shown, or having the same Figure 9 The different configurations shown.

[0088] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0089] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0090] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An adaptive correction method for a gas water heater, characterized in that, The gas water heater stores a first load setting, a second load setting, and an intermediate load setting between the first load setting and the second load setting, and stores the normal fan current setting value and the fan blockage current setting value corresponding to each load setting; the normal fan current setting value is the preset operating current of the fan in a non-blocked state; the fan blockage current setting value is the preset operating current of the fan in a blocked state. The gas water heater is pre-configured with a correction strategy for adjusting the normal current setting value of the fan; the method includes: The normal current setting value of the fan at the first load setting and the normal current setting value of the fan at the second load setting are corrected based on the correction strategy. Based on the normal current level values ​​of the fan before and after the first load level correction, the first current change rate corresponding to the first load level is obtained. Based on the normal current level values ​​of the fan before and after the second load level correction, the second current change rate corresponding to the second load level is obtained. Based on the first current change rate and the second current change rate, the intermediate current change rate corresponding to the intermediate load level is obtained; Based on the intermediate current change rate corresponding to the intermediate load level, the fan blockage current level value corresponding to the intermediate load level is corrected.

2. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The first load setting is the minimum load setting, and the second load setting is the maximum load setting.

3. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The step of obtaining the first current change rate corresponding to the first load level based on the normal current level values ​​of the fan before and after the first load level correction includes: The ratio of the fan normal current level after the first load level correction to the fan normal current level before the first load level correction is taken as the first current change rate. The process of obtaining the second current change rate corresponding to the second load level based on the normal current level values ​​of the fan before and after the second load level correction includes: The ratio of the fan normal current setting value after the second load setting correction to the fan normal current setting value before the second load setting correction is taken as the second current change rate.

4. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The step of obtaining the intermediate current change rate corresponding to the intermediate load level based on the first current change rate and the second current change rate includes: Based on the difference between the first current change rate and the second current change rate, and the number of intermediate load levels, the difference in current change rate between adjacent load levels is obtained. Based on the difference in the rate of change of current and the number of load levels between the intermediate load level and the first load level or the second load level, the intermediate current rate of change corresponding to the intermediate load level is determined.

5. The adaptive correction method for a gas water heater according to claim 4, characterized in that, The difference in the rate of change of current between adjacent load levels is calculated using the following formula: in, This represents the difference in the rate of change of current. The first rate of change of current; is the second current change rate; N is the number of intermediate load levels.

6. The adaptive correction method for a gas water heater according to claim 4, characterized in that, The rate of change of intermediate current corresponding to the intermediate load level is calculated using the following formula: in, This represents the calculated rate of change of the intermediate current at the intermediate load level. X represents the difference in current change rate; X is the number of load levels between the calculated intermediate load level and the first load level. The rate of change of the first gear value; or in, This represents the calculated rate of change of the intermediate current at the intermediate load level. Y represents the difference in current change rate; Y is the number of load levels between the calculated intermediate load level and the second load level. This represents the rate of change for the second-tier value.

7. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The step of correcting the fan blockage current level value corresponding to the intermediate load level based on the intermediate current change rate corresponding to the intermediate load level includes: The fan blockage current value of the intermediate load setting is calculated according to the corresponding intermediate current change rate to obtain the fan blockage current correction value corresponding to the intermediate load setting. The fan blockage current correction value of the intermediate load setting is stored as the new fan blockage current setting value of the intermediate load setting. The correction value for the fan blockage current at the intermediate load level is calculated using the following formula: in, This represents the rate of change of the intermediate current at the intermediate load level. This is the fan blockage current setting for the intermediate load position; This is the correction value for the fan blockage current at the intermediate load setting.

8. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The correction strategy includes: The gas water heater is controlled to operate at the target corrected load level, and the operating current of the fan is controlled to be the normal current level value of the fan corresponding to the target corrected load level, and the current speed of the fan is obtained in real time. Determine whether the current speed is within the preset speed range corresponding to the target corrected load gear; If the current speed is outside the preset speed range, the operating current of the fan is adjusted until the current speed is adjusted to the preset speed range, and the adjusted operating current is used as the new normal current level value of the fan for the target corrected load level. In the correction strategy, the wind turbine is controlled by a constant current control method.

9. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The method further includes: After sequentially correcting the fan normal current value of the first load level and the fan normal current value of the second load level based on the correction strategy, the gas water heater is controlled to work at the first corrected load level and the working current of the fan is controlled to be the fan normal current value corresponding to the first corrected load level, and the current speed of the fan is obtained in real time. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the previously corrected load setting; If the current speed is outside the preset speed range corresponding to the previously corrected load level, then the normal current level value of the fan is corrected again based on the correction strategy. If the current speed is within the preset speed range corresponding to the first corrected load setting, then the gas water heater is controlled to work at the second corrected load setting, and the working current of the fan is controlled to be the normal current setting value of the fan corresponding to the second corrected load setting. After the gas water heater is in stable combustion, determine whether the current speed is within the preset speed range corresponding to the later corrected load setting; If the current speed is outside the preset speed range corresponding to the subsequently corrected load level, then the normal current level value of the fan is corrected again based on the correction strategy. If the number of corrections to the normal current setting of the fan at the load setting exceeds a preset number, the gas water heater will be controlled to stop working and a fault will be reported.

10. The adaptive correction method for a gas water heater according to claim 1, characterized in that, The method further includes: Based on the intermediate current change rate corresponding to the intermediate load level, the normal current level value of the fan at the intermediate load level is corrected.

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