Methods for alarming abnormal gas calorific value in gas water heaters and gas water heaters

Abstract

This invention discloses a method for alarming abnormal gas calorific value in a gas water heater and a gas water heater, including the following steps: S1. Set a preset gas demand value GA, a preset water temperature, and turn on the gas water heater's fan and gas proportional valve; S2. Adjust the fan and proportional valve to make the outlet water temperature reach the preset water temperature and stabilize; S3. Detect the actual gas flow value G through a gas flow sensor, and compare whether the actual gas flow value G exceeds the alarm range. If not, repeat step S2; if so, proceed to step S4; S4. Issue an alarm for abnormal gas calorific value. This invention, by comparing the difference between the two values, determines whether the water heater problem is caused by excessively high or low gas calorific value. Adjusting the gas intake and air intake balances the outlet water temperature without affecting normal use, solving problems such as ignition failure and excessively high or low outlet water temperature, and facilitating user troubleshooting.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water heaters, in particular to a gas heat value abnormality alarm method of a gas water heater and the gas water heater. BACKGROUND

[0002] The gas water heater is used to release heat by igniting the gas mixed with air, and the heat is transferred to the cold water through the heat exchanger to make the water warm. After the user starts the water, the cold water enters the heat exchanger from the water inlet, and the whole machine starts to work. The main fan rotates, and the negative pressure cavity is formed at the rear end of the fan. The air is then sucked from the bottom of the combustion chamber box, as shown in the first air inlet passage. At this time, the gas valve assembly is controlled to inject gas, and ignition is started. After the ignition is successful, the gas mixed with air burns to release heat to form high-temperature flue gas. The high-temperature flue gas heats the cold water to become hot water, and the high-temperature flue gas is cooled to about 160℃ and concentrated in the smoke hood. Through the smoke hood, the fan passage is discharged. The gas water heater needs to match the air volume and the gas volume to ensure complete combustion. The gas volume is usually adjusted by controlling the opening of the proportional valve. The corresponding relationship between the opening of the proportional valve and the gas volume is determined under standard working conditions. Therefore, the existing gas water heater may encounter problems such as failure to ignite, excessively high or low water temperature, etc. during use. SUMMARY

[0003] The present application solves the technical problem of overcoming the defects of the prior art that the gas water heater may encounter problems such as failure to ignite, excessively high or low water temperature, etc. during use, and provides a gas heat value abnormality alarm method of a gas water heater and the gas water heater.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] A gas heat value abnormality alarm method of a gas water heater, characterized in that it comprises the following steps:

[0006] S1. Setting a preset gas demand value GA, a preset water temperature, and starting the fan and the gas proportional valve of the gas water heater;

[0007] S2. Adjusting the fan and the proportional valve to make the water temperature reach the preset water temperature and stabilize;

[0008] S3. Detecting the actual gas flow value G by the gas flow sensor, comparing whether the actual gas flow value G exceeds the alarm interval, if not, executing step S2 cyclically, and if yes, executing step S4;

[0009] S4. Performing gas heat value abnormality alarm.

[0010] In the present scheme, the above method is adopted, the heat generated by gas combustion is determined by the calorific value of gas, and the gas components of different suppliers in different regions are not completely the same, so the calorific value is not completely consistent. When calibrating, the water heater is often calibrated with standard calorific value gas, which may not match the actual supply gas temperature in actual use, causing the gas outlet water temperature to be too high or too low. At this time, the balance of the outlet water temperature is realized by increasing or reducing the amount of gas. If the amount of gas consumed when reaching the set temperature is different from the preset gas demand, the difference between the two is compared to determine whether the problem of the water heater is caused by the high or low calorific value of the gas. If it is determined that there is a problem, on the one hand, the user is warned of the problem in a timely manner to facilitate troubleshooting and response, and on the other hand, the balance of the outlet water temperature is realized by adjusting the gas intake amount and air amount without affecting normal use, which can solve the problem of no ignition, too high or too low outlet water temperature, and facilitate user troubleshooting and response.

[0011] Preferably, it further comprises step S5:

[0012] S5.1. Calculate the ratio value of the current actual gas flow value G and the preset gas demand value GA;

[0013] S5.2. Execute step S5.1 multiple times, and compare the measured ratio values to determine whether the ratio value is stable. If the ratio value is stable, execute step S5.3;

[0014] S5.3. Adjust the preset gas demand value GA according to the ratio value measured in step S5.2.

[0015] In the present scheme, the above method is adopted, the ratio value of the actual gas flow value and the preset gas demand value is detected multiple times, and it is determined whether the ratio value is stable. If it is stable, it indicates that there is a difference between the gas calorific value and the standard calorific value, and the calorific value difference is consistent with the ratio value. Therefore, by further adjusting the gas proportional valve opening to increase or decrease the corresponding amount of gas, the same heating effect can be more accurately realized.

[0016] Preferably, step S2 further comprises:

[0017] S2.1. Detect the actual gas flow value G, and when the actual gas flow value G reaches the preset gas demand value GA, detect the outlet water temperature;

[0018] S2.2. If the measured outlet water temperature is less than the preset water temperature, increase the opening of the gas proportional valve; if the measured outlet water temperature is greater than the preset water temperature, decrease the opening of the gas proportional valve.

[0019] In the present scheme, the above method is adopted, and by adjusting the gas proportional valve opening to increase or decrease the corresponding amount of gas, the same heating effect can be more accurately realized.

[0020] Preferably, the step S1 comprises:

[0021] S1.1. Pre-calibration of the gas water heater, setting the gas supply pressure to a standard pressure state, using a standard heat value gas, and obtaining a preset gas demand value GA that makes the outlet water temperature reach a preset temperature.

[0022] In this scheme, the above method is used. Before use, the standard working condition state of the product is calibrated first to determine the values of various data of the product when it is working normally. When the product is actually working, the values during actual work and the values of the standard working condition can be compared to facilitate determination of whether the product is in an abnormal working condition state and adaptive adjustment of parameters for normal work in the abnormal working condition state.

[0023] Preferably, the step S1 further comprises:

[0024] S1.2. Pre-calibration of the gas water heater to determine the range of the alarm interval.

[0025] In this scheme, the above method is used. Before use, the standard working condition state and the abnormal working condition of the product are calibrated first to determine the values of various data of the product when it is working normally and when it is abnormal. When the product is actually working, the values during actual work and the values of the standard working condition can be compared to facilitate determination of whether the product is in an abnormal working condition state and adaptive adjustment of parameters for normal work in the abnormal working condition state.

[0026] Preferably,

[0027] The step S1.2 specifically comprises:

[0028] Step S1.2.1. Set the gas supply pressure to a standard pressure state, use low heat value gas, and obtain a gas demand value G1 that makes the outlet water temperature reach a preset temperature;

[0029] Step S1.2.2. Set the gas supply pressure to a standard pressure state, use high heat value gas, and obtain a gas demand value G2 that makes the outlet water temperature reach a preset temperature;

[0030] Step S1.2.3. According to GA, G1, and G2, set the alarm interval.

[0031] In this scheme, when pre-calibration is performed, the entire machine is supplied with low heat value gas and high heat value gas, and the corresponding gas demand amounts are obtained, and the abnormal heat value gas demand amount is compared with the gas demand amount of the standard heat value gas to directly reflect whether there is an abnormal gas heat value. The preset alarm state is determined according to the above difference, so that the preset alarm value is more reasonable and the alarm is more accurate.

[0032] Preferably, the standard pressure state can be set to 2000 Pa.

[0033] In the present solution, the standard pressure state is set to 2000 Pa, which is most consistent with the environmental state in daily use, so the calibration of the standard working condition is most accurate.

[0034] Preferably, the alarm interval ranges from (G1-GA) / 2+GA to (GA-G2) / 2+G2.

[0035] In the present solution, the alarm interval is set to two intervals of the standard requirement value to the requirement value of low calorific value gas and the requirement value of high calorific value gas, and closer to the two ends of the requirement value of low calorific value gas and the requirement value of high calorific value gas. Only when the gas calorific value is high or low to a certain extent, the alarm will be triggered, so that the alarm is more reasonable and accurate.

[0036] Preferably, step S4 comprises:

[0037] Step S4.1 If the actual gas flow value G is greater than (G1-GA) / 2+GA, alarm low calorific value warning;

[0038] Step S4.2 If the actual gas flow value G is less than (GA-G2) / 2+G2, alarm high calorific value warning.

[0039] In the present solution, the alarm device alarms according to the interval of the actual gas flow value, and can alarm for low calorific value gas and high calorific value gas respectively, so that the alarm is more accurate.

[0040] A gas water heater used in the gas constant flow working method of the gas water heater as described above, characterized in that the gas water heater comprises a gas valve assembly, a gas flow sensor, a control device and an alarm device, the control device can control the alarm device to alarm failure according to the value fed back by the gas flow sensor.

[0041] In the present scheme, the heat generated by the gas combustion is determined by the gas calorific value, and the gas components of different suppliers in different regions are not completely the same, so the calorific value is also not completely consistent. When calibrating the water heater, the standard gas calorific value is often used for calibration. In actual use, the temperature of the actual supplied gas may not match the actual supplied gas, causing the gas outlet water temperature to be too high or too low. At this time, the balance of the outlet water temperature is realized by increasing or decreasing the amount of gas. If the amount of gas consumed when reaching the set temperature is different from the preset gas demand, the difference between the two is compared to determine whether the problem of the water heater is caused by the high or low gas calorific value. If it is determined that there is a problem, on the one hand, the user is warned in time to indicate the problem, which facilitates troubleshooting and response. On the other hand, the balance of the outlet water temperature is realized by adjusting the gas intake amount and the air amount, which does not affect normal use, can solve the problem of no ignition, too high or too low outlet water temperature, and facilitates user troubleshooting and response

[0042] The positive progress effect of the present application is that a gas water heater gas calorific value abnormality alarm method and a gas water heater are disclosed. The heat generated by the gas combustion is determined by the gas calorific value, and the gas components of different suppliers in different regions are not completely the same, so the calorific value is also not completely consistent. When calibrating the water heater, the standard gas calorific value is often used for calibration. In actual use, the temperature of the actual supplied gas may not match the actual supplied gas, causing the gas outlet water temperature to be too high or too low. At this time, the balance of the outlet water temperature is realized by increasing or decreasing the amount of gas. If the amount of gas consumed when reaching the set temperature is different from the preset gas demand, the difference between the two is compared to determine whether the problem of the water heater is caused by the high or low gas calorific value. If it is determined that there is a problem, on the one hand, the user is warned in time to indicate the problem, which facilitates troubleshooting and response. On the other hand, the balance of the outlet water temperature is realized by adjusting the gas intake amount and the air amount, which does not affect normal use, can solve the problem of no ignition, too high or too low outlet water temperature, and facilitates user troubleshooting and response. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the gas water heater of the embodiment of the present application.

[0044] Figure 2 It is a flowchart of the best embodiment of the gas constant flow working method of the gas water heater of the present application.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] Combustion chamber assembly 1

[0047] Heat exchanger assembly 2

[0048] Fan assembly 3

[0049] Air outlet 31

[0050] Air valve assembly 4

[0051] Gas flow sensor 5

[0052] Air volume sensor 6 Detailed Implementation

[0053] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0054] like Figure 1 As shown, this embodiment first discloses a gas water heater, which includes a combustion chamber assembly 1, a heat exchanger assembly 2, a fan assembly 3, and a gas valve assembly 4. The fan assembly 3 is connected to a ventilation duct and is used to draw in outside air from the air inlet, mix it with the gas flowing in after the gas valve assembly 4 is opened, and burn it in the combustion chamber assembly 1. After heat exchange with cold water through the heat exchanger assembly, the gas is discharged from the exhaust port 31. An air volume sensor 6 is installed on the exhaust port 31, and a gas flow sensor 5 is installed at the air inlet of the gas valve assembly 4. The gas water heater also includes a control device (not shown in the figure), which can be electrically connected to the fan assembly 3, the gas valve assembly 4, the air volume sensor 6, and the gas flow sensor 5 to control their operating status.

[0055] The gas valve assembly 4 is equipped with a proportional valve, which can be controlled by a control device to adjust its opening degree, thereby adjusting the gas flow accordingly.

[0056] The gas water heater also includes an alarm device, and the control device can control the alarm device to sound an alarm based on the value fed back by the gas flow sensor 5.

[0057] By setting up an alarm device, an alarm can be automatically triggered when the malfunction is so severe that it may affect the normal operation of the water heater, making it easier for service technicians to quickly locate the problem and carry out repairs.

[0058] Gas water heaters are also equipped with a temperature detection device at the water outlet to detect the water temperature and determine whether the water temperature has reached the set temperature.

[0059] This embodiment also discloses a method for alarming abnormal gas calorific value in a gas water heater, which includes the following steps:

[0060] S1. Set the preset gas demand value GA, preset water temperature, and turn on the gas water heater's fan and gas proportional valve;

[0061] S2. Adjust the blower and proportional valve to ensure that the outlet water temperature reaches the preset water temperature and remains stable;

[0062] S3. Detecting the actual gas flow value G through the gas flow sensor, comparing whether the actual gas flow value G exceeds the alarm interval, if not, executing step S2 cyclically, if yes, executing step S4;

[0063] S4. Performing gas heat value abnormality alarm.

[0064] The heat generated by gas combustion is determined by the gas heat value, and the gas components of different regions and different suppliers are not completely the same, so the heat values are not completely consistent. When calibrating, the water heater is often calibrated with standard heat value gas, which may not match the actual supply gas temperature in actual use, causing the gas outlet water temperature to be too high or too low. At this time, the balance of the outlet water temperature is realized by increasing or decreasing the amount of gas. If the amount of gas consumed when reaching the set temperature is different from the preset gas demand, the difference between the two is compared to determine whether the problem of the water heater is caused by high or low gas heat value. If it is determined that there is a problem, on the one hand, the user is warned in time to indicate the problem, which is convenient for troubleshooting and response, and on the other hand, the balance of the outlet water temperature is realized by adjusting the gas intake amount and air amount, which does not affect normal use, can solve the problem of no ignition, too high or too low outlet water temperature, and is convenient for users to troubleshoot and respond.

[0065] The method further comprises step S5:

[0066] S5.1. Calculating the ratio value of the current actual gas flow value G and the preset gas demand value GA;

[0067] S5.2. Executing step S5.1 multiple times, and comparing the measured ratio values to determine whether the ratio value is stable, if the ratio value is stable, executing step S5.3;

[0068] S5.3. Adjusting the preset gas demand value GA according to the ratio value measured in step S5.2.

[0069] By detecting the ratio value of the actual gas flow value and the preset gas demand value multiple times, and determining whether the ratio value is stable, if it is stable, it indicates that there is a difference between the gas heat value and the standard heat value, and the heat value difference is consistent with the ratio value. Therefore, by further adjusting the gas ratio valve opening to increase or decrease the corresponding amount of gas, the same heating effect can be more accurately realized.

[0070] Step S2 further comprises:

[0071] S2.1. Detecting the actual gas flow value G, and detecting the outlet water temperature when the actual gas flow value G reaches the preset gas demand value GA;

[0072] S2.2. If the measured outlet water temperature is less than the preset water temperature, increasing the opening of the gas ratio valve; if the measured outlet water temperature is greater than the preset water temperature, decreasing the opening of the gas ratio valve.

[0073] By adjusting the gas proportional valve opening to increase or decrease the corresponding gas amount, the same heating effect can be more accurately achieved.

[0074] Step S1 comprises:

[0075] S1.1. Pre-calibration of the gas water heater, set the gas supply pressure to the standard pressure state, use the standard heat value gas, and obtain the preset gas demand value GA that makes the outlet water temperature reach the preset temperature.

[0076] Before use, the standard working condition state of the product is calibrated first, and the values of various data of the product when working normally are determined, so that when the product is actually working, the values when actually working and the values of the standard working condition can be compared, which is convenient for determining that the product is in an abnormal working condition state and adaptively adjusting parameters to work normally in the abnormal working condition state.

[0077] Step S1 further comprises:

[0078] S1.2. Pre-calibration of the gas water heater to determine the range of the alarm interval.

[0079] Before use, the standard working condition state and the abnormal working condition of the product are calibrated first, and the values of various data of the product when working normally and when an abnormality occurs are determined, so that when the product is actually working, the values when actually working and the values of the standard working condition can be compared, which is convenient for determining that the product is in an abnormal working condition state and adaptively adjusting parameters to work normally in the abnormal working condition state.

[0080] Step S1.2 specifically comprises:

[0081] Step S1.2.1. Set the gas supply pressure to the standard pressure state, use low heat value gas, and obtain the gas demand value G1 that makes the outlet water temperature reach the preset temperature;

[0082] Step S1.2.2. Set the gas supply pressure to the standard pressure state, use high heat value gas, and obtain the gas demand value G2 that makes the outlet water temperature reach the preset temperature;

[0083] Step S1.2.3. According to GA, G1, and G2, set the alarm interval.

[0084] When pre-calibration is performed, by supplying the whole machine with low heat value gas and high heat value gas and respectively obtaining the corresponding gas demand, and comparing the above abnormal heat value gas demand with the gas demand of the standard heat value gas, it can be directly reflected whether there is a gas heat value abnormality. The preset alarm state is determined according to the above difference, so that the preset alarm value is more reasonable, and the alarm is more accurate.

[0085] In this embodiment, the standard pressure state can be set to 2000 Pa;

[0086] The standard pressure state is set to 2000 Pa, which is most consistent with the environmental state in daily use, so the calibration of the standard working condition is most accurate.

[0087] The alarm interval ranges from (G1-GA) / 2+GA to (GA-G2) / 2+G2.

[0088] The alarm interval is set to two intervals of the standard demand value to the low calorific value gas demand value and the high calorific value gas demand value, and more than the two ends of the low calorific value gas demand value and the high calorific value gas demand value. Only when the gas calorific value is high or low to a certain extent, the alarm will be triggered, so that the alarm is more reasonable and accurate.

[0089] In other embodiments, the range can be further expanded to increase the alarm sensitivity, or the range can be reduced to reduce the false alarm rate.

[0090] Step S4 includes:

[0091] Step S4.1 If the actual gas flow value G is greater than (G1-GA) / 2+GA, alarm low calorific value warning;

[0092] Step S4.2 If the actual gas flow value G is less than (GA-G2) / 2+G2, alarm high calorific value warning.

[0093] The alarm device alarms according to the interval of the actual gas flow value. Whether it can alarm for low calorific value gas and high calorific value gas respectively, the alarm is more accurate.

[0094] As shown in Figure 2 The embodiment also provides a best embodiment of a gas water heater gas calorific value abnormality alarm method, which specifically includes the following steps:

[0095] S1. Pre-calibrate the gas water heater, set the preset water temperature, set the gas supply pressure to the standard pressure state, use low calorific value gas, and obtain the preset gas demand value GA that makes the outlet water temperature reach the preset temperature. Set the gas supply pressure to the standard pressure state, use low calorific value gas, and obtain the gas demand value G1 that makes the outlet water temperature reach the preset temperature; set the gas supply pressure to the standard pressure state, use high calorific value gas, and obtain the gas demand value G2 that makes the outlet water temperature reach the preset temperature; set the alarm interval according to GA, G1 and G2.

[0096] S2. Turn on the fan and gas proportional valve of the gas water heater.

[0097] S3. Measure the actual gas flow value G, and detect the outlet water temperature when the actual gas flow value G reaches the preset gas demand value GA.

[0098] S4. Detecting the outlet water temperature, judging the relationship between the outlet water temperature and the preset outlet water temperature.

[0099] S5. If the measured outlet water temperature is not equal to the preset water temperature, then adaptively adjusting the fan and the proportional valve and detecting the outlet water temperature again.

[0100] S6. Detecting the actual gas flow value G through the gas flow sensor, comparing whether the actual gas flow value G exceeds the alarm interval, if not, then executing step S3 repeatedly, if yes, then executing step S7.

[0101] S7. If the actual gas flow value G is greater than (G1-GA) / 2+GA, then alarming low heat value warning; if the actual gas flow value G is less than (GA-G2) / 2+G2, then alarming high heat value warning.

[0102] S8. Calculating the ratio value of the current actual gas flow value G and the preset gas demand value GA for multiple times, comparing the measured ratio value, judging whether the ratio value is stable, if the ratio value is stable, then executing step S9.

[0103] S9. Adjusting the preset gas demand value GA according to the measured ratio value of step S8.

[0104] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A gas value anomaly alarm method for a gas water heater, characterized in that, It comprises the following steps: S1. setting a preset gas demand value GA, a preset water temperature, and turning on a fan and a gas proportional valve of a gas water heater; Step S1 comprises: S1.

1. Pre-calibration of the gas water heater, setting the supply pressure to a standard pressure state, using standard heat value gas, and obtaining a preset gas demand value GA that makes the outlet water temperature reach the preset temperature; S1.

2. Pre-calibration of the gas water heater to determine the range of the alarm interval; Step S1.2 specifically comprises: Step S1.2.

1. Set the supply pressure to a standard pressure state, use low heat value gas, and obtain the gas demand value G1 that makes the outlet water temperature reach the preset temperature; Step S1.2.

2. Set the supply pressure to a standard pressure state, use high heat value gas, and obtain the gas demand value G2 that makes the outlet water temperature reach the preset temperature; Step S1.2.

3. According to GA, G1, G2, set the alarm interval; S2. Adjust the fan and the proportional valve to make the outlet water temperature reach the preset water temperature and stabilize; S3. Detect the actual gas flow value G through the gas flow sensor, compare whether the actual gas flow value G exceeds the alarm interval, if not, execute step S2 repeatedly, if yes, execute step S4; S4. Perform gas heat value abnormality alarm; Further comprising step S5: S5.

1. Calculate the proportional value of the current actual gas flow value G and the preset gas demand value GA; S5.

2. Execute step S5.1 multiple times, compare the measured proportional values, and determine whether the proportional value is stable, if the proportional value is stable, execute step S5.3; S5.

3. Adjust the preset gas demand value GA according to the measured proportional value of step S5.

2.

2. The gas value abnormality alarm method for a gas water heater according to claim 1, wherein Step S2 further comprises: S2.

1. Detect the actual gas flow value G, and when the actual gas flow value G reaches the preset gas demand value GA, detect the outlet water temperature; S2.

2. If the measured outlet water temperature is less than the preset water temperature, increase the opening of the gas proportional valve; if the measured outlet water temperature is greater than the preset water temperature, decrease the opening of the gas proportional valve.

3. The gas value anomaly alarm method of the gas water heater according to claim 1, wherein, The standard pressure state can be set to 2000 Pa.

4. The gas value anomaly alarm method of the gas water heater according to claim 1, wherein, The range of the alarm interval is (G1-GA) / 2+GA above and (GA-G2) / 2+G2 below.

5. The gas value anomaly alarm method of the gas water heater according to claim 1, wherein, Step S4 comprises: Step S4.

1. If the actual gas flow value G is greater than (G1-GA) / 2+GA, alarm for low heat value warning; Step S4.

2. If the actual gas flow value G is less than (GA-G2) / 2+G2, alarm for high heat value warning.

6. A gas water heater characterized by, The gas water heater uses the gas heat value abnormality alarm method of any one of claims 1-5 to alarm, and the gas water heater comprises a gas valve assembly, a gas flow sensor, a control device, and an alarm device, and the control device can control the alarm device to alarm failure according to the value fed back by the gas flow sensor.

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