Gas water heater gas constant flow working method and gas water heater

Abstract

The application discloses a kind of gas water heater gas constant flow working method and gas water heater, comprising the following steps: S1. set up preset gas flow value GA and open gas proportional valve;S2. actual gas flow value G is detected by gas flow sensor, compare actual gas flow value G whether less than preset gas flow value GA, if no, then cyclic execution step S2, if yes, then execution step S3;S3. increase the current I of proportional valve to increase the opening of proportional valve, and repeat execution S2 again.The application is detected by flow sensor, if not reach preset gas flow, then increase the current of proportional valve to increase the opening of proportional valve, and increase gas intake amount.Actual gas flow when water heater works is detected in real time by flow sensor, even if product can be adjusted combustion parameters according to current combustion state when abnormal working condition, improve product adaptability, reach the purpose of stable ignition combustion, more accurate than traditional control.

Description

Technical Field

[0001] This invention relates to the field of water heaters, and in particular to a method for constant gas flow operation in a gas water heater and a gas water heater. Background Technology

[0002] Gas water heaters work by mixing gas and air in a specific ratio, igniting the mixture to release heat, and then transferring this heat to cold water through a heat exchanger, thus heating the water. When the user turns on the water heater, cold water enters the heat exchanger through the inlet, and the entire unit begins to operate. The main fan rotates, creating a negative pressure chamber at the rear of the fan, which draws air in from the bottom of the combustion chamber box, as shown in the first air inlet channel in the diagram. At this point, the control valve assembly injects gas and initiates ignition. After successful ignition, the gas and air mix and burn, releasing heat to form high-temperature flue gas. This high-temperature flue gas heats the cold water to make hot water. The high-temperature flue gas then cools down to about 160°C and is collected in the fume hood, from where it is discharged through the fan channel. When controlling a gas water heater, the airflow and gas flow must be precisely matched to ensure complete combustion. The gas volume is usually adjusted by controlling the opening of a proportional valve. The relationship between the proportional valve opening and the gas volume is measured under standard operating conditions. However, gas water heaters may experience various malfunctions or different operating conditions in actual use. Therefore, existing gas water heaters may encounter problems such as strong outside wind, low gas supply pressure, incorrect gas calorific value, and failure to ignite during use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of existing gas water heaters, such as strong external wind, low gas supply pressure, incorrect gas calorific value, and failure to ignite, and to provide a gas water heater with constant gas flow operation method and gas water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A method for maintaining constant gas flow in a gas water heater, characterized by comprising the following steps:

[0006] S1. Set the preset gas flow rate value GA and open the gas proportional valve;

[0007] S2. Detect the actual gas flow value G using a gas flow sensor, and compare whether the actual gas flow value G is less than the preset gas flow value GA. If not, repeat step S2; if yes, repeat step S3.

[0008] S3. Increase the current I of the proportional valve to increase the opening degree of the proportional valve, and then repeat S2.

[0009] In this solution, the aforementioned structure is used. The main board provides a preset gas flow rate and adjusts the opening of the proportional valve by adjusting the current flowing through it in the gas water heater. This adjusts the size of the gas inlet and thus the gas flow rate. A flow sensor confirms whether the preset gas flow rate has been reached. If it hasn't, the current flowing through the proportional valve is increased to increase its opening and the gas intake. The flow sensor monitors the actual gas flow rate in real time during water heater operation. Even in abnormal operating conditions, the combustion parameters can be adjusted based on the current combustion status, improving product adaptability and achieving stable ignition and combustion. This method is more precise than traditional control methods.

[0010] Preferably, step S1 further includes: S1.1 calibrating the gas intake of the proportional valve of the gas water heater under standard pressure conditions, and determining the preset flow current IA when the proportional valve meets the preset gas flow value GA.

[0011] In this solution, the above structure is adopted. Before use, the standard operating conditions of the product are calibrated to determine the values ​​of various data when the product is working normally. This allows for comparison between the actual operating values ​​and the standard operating conditions when the product is actually working, making it easier to identify abnormal operating conditions and adaptively adjust parameters to ensure normal operation under abnormal conditions.

[0012] Preferably, the standard pressure is 2000 Pa.

[0013] In this solution, the above structure is adopted, and the standard pressure is set to 2000Pa, which best matches the environmental conditions in daily use. Therefore, the calibration of the standard working condition is the most accurate.

[0014] Preferably, step S2 further includes:

[0015] S2.1. Detect the current I of the proportional valve. When the current I reaches the preset flow current IA, detect the gas flow value G through the gas flow sensor.

[0016] In this solution, the above structure is adopted. When the gas water heater is working, it first determines whether the current through the proportional valve reaches the current IA required when the gas intake volume reaches the preset gas flow rate GA under standard operating conditions. Then, it verifies whether the actual gas flow rate G reaches GA. This can avoid the problem of poor adjustment accuracy caused by accidental triggering of adjustment when the gas water heater is still in the start-up state.

[0017] Better options also include:

[0018] Step S2.2. When the actual gas flow rate G reaches the preset gas flow rate GA, compare the difference ΔA between the current I of the proportional valve at that time and the preset flow current IA. If ΔA is greater than the preset alarm current difference IN, then execute step S4.

[0019] Step S4. Alarm notification to the user.

[0020] In this solution, the severity of the fault is determined by setting a preset alarm current difference and detecting the difference between the actual operating parameters and the preset parameters under standard operating conditions. When the difference is small, it indicates a minor fault with minimal impact on the gas water heater, and the operating parameters are automatically adjusted to meet normal operating requirements. When the difference is large and exceeds the preset alarm value, it indicates a very serious fault that may affect the normal operation of the water heater, and an alarm is automatically triggered to facilitate a quick on-site inspection and repair by a service technician.

[0021] Preferably, the method also includes step S1.2: performing a pre-calibration on the gas water heater to determine the value of the preset alarm current difference IN.

[0022] In this solution, by using the above method, different gas water heaters are pre-calibrated based on the preset alarm current difference IN before operation. This allows for more accurate determination of the appropriate preset alarm value for different water heaters and different working environments, resulting in more accurate alarms and improved user experience.

[0023] Preferably, step S1.2 specifically includes:

[0024] Step S1.2.1. Set the gas supply pressure to the standard pressure state; test and record the current I1 passing through the proportional valve under each preset gas flow value GA state;

[0025] Step S1.2.2. Set the gas supply pressure to a low pressure state; test and record the current I2 passing through the proportional valve under each preset gas flow rate value GA state.

[0026] Step S1.2.3. Calculate IN = I2 - I1.

[0027] In this solution, by adjusting the entire machine to standard pressure and low pressure states during pre-calibration using the aforementioned method, and obtaining the corresponding differences, the severity of the blockage fault can be intuitively reflected. The preset alarm state is then determined based on these differences, making the preset alarm values ​​more reasonable and the alarms more accurate.

[0028] Preferably, in step S1.2.1, the standard pressure state can be set to 2000 Pa;

[0029] In step S1.2.2, the low pressure state can be set to 800 Pa.

[0030] In this solution, the standard pressure is set to 2000Pa using the method described above, which best matches the environmental conditions in daily use, thus ensuring the most accurate calibration of the standard operating conditions. Simultaneously, setting the low pressure to 800Pa accurately simulates the environmental conditions when the water heater experiences a low gas pressure malfunction, facilitating timely alarm notification to the user.

[0031] A gas water heater used in the gas constant flow operation method of the gas water heater as described above is characterized in that the gas water heater includes a gas valve assembly, a gas flow sensor, and a control device. The gas flow sensor is installed at the gas inlet of the gas water heater, and the control device can control the current of the proportional valve in the gas valve assembly according to the value fed back by the gas flow sensor.

[0032] In this solution, the aforementioned structure ensures a constant gas flow rate for the water heater. The main board provides a preset gas flow rate and adjusts the opening of the proportional valve by regulating the current flowing through it. This adjusts the size of the gas inlet and thus the gas flow rate. A flow sensor confirms whether the preset gas flow rate has been reached. If not, the current flowing through the proportional valve is increased to increase its opening and gas intake. The flow sensor continuously monitors the actual gas flow rate during operation. Even in abnormal conditions, the combustion parameters can be adjusted based on the current combustion status, improving product adaptability and achieving stable ignition and combustion—a more precise control method than traditional methods.

[0033] Preferably, the gas water heater also includes an alarm device, and the control device can control the alarm device to alarm for faults based on the value fed back by the gas flow sensor.

[0034] In this solution, the above structure is adopted. By setting up an alarm device, an alarm can be automatically triggered when the fault is so severe that it may affect the normal operation of the water heater, making it easier for service technicians to quickly find the problem and carry out repairs.

[0035] The positive and progressive effects of this invention are as follows: This solution discloses a constant gas flow operation method for a gas water heater and a gas water heater that can guarantee constant gas flow operation. The main board provides a preset gas value and adjusts the opening of the proportional valve by adjusting the current passing through the proportional valve in the gas water heater. This adjusts the size of the gas inlet and thus the gas flow. A flow sensor confirms whether the preset gas flow value has been reached. If the preset gas flow value has not been reached, the current passing through the proportional valve is increased to increase the valve opening and increase the gas intake. By using a flow sensor to detect the actual gas flow during water heater operation in real time, even in abnormal operating conditions, the combustion parameters can be adjusted according to the current combustion state, improving product adaptability and achieving stable ignition and combustion, which is more precise than traditional control methods. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a gas water heater according to an embodiment of the present invention.

[0037] Figure 2 This is a flowchart illustrating the preferred embodiment of the constant gas flow method for a gas water heater according to the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Combustion chamber assembly 1

[0040] Heat exchanger assembly 2

[0041] Fan assembly 3

[0042] Exhaust vent 31

[0043] Air valve assembly 4

[0044] Gas flow sensor 5

[0045] Air volume sensor 6 Detailed Implementation

[0046] 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.

[0047] like Figure 1As 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] This embodiment also provides a method for maintaining a constant gas flow rate in a gas water heater. The method includes the following steps:

[0052] A method for maintaining constant gas flow in a gas water heater, characterized by comprising the following steps:

[0053] S1. Set the preset gas flow rate value GA and open the gas proportional valve;

[0054] S2. Detect the actual gas flow value G through the gas flow sensor 5, and compare whether the actual gas flow value G is less than the preset gas flow value GA. If not, repeat step S2; if yes, repeat step S3.

[0055] S3. Increase the current I of the proportional valve to increase the opening degree of the proportional valve, and then repeat S2.

[0056] The control device provides a preset gas flow rate and adjusts the opening of the proportional valve by changing the current flowing through it in the gas water heater. This adjusts the size of the gas inlet and thus the gas flow rate. A flow sensor confirms whether the preset gas flow rate has been reached. If it hasn't, the current flowing through the proportional valve is increased to increase its opening and the gas intake. The flow sensor monitors the actual gas flow rate in real time during water heater operation. Even in abnormal operating conditions, the device can adjust combustion parameters based on the current combustion status, improving product adaptability and achieving stable ignition and combustion. This method is more precise than traditional control methods.

[0057] Step S1 also includes: S1.1 calibrating the gas intake of the proportional valve of the gas water heater under standard pressure conditions, and determining the preset flow current IA when the proportional valve meets the preset gas flow value GA.

[0058] Before use, the product should be calibrated under standard operating conditions to determine the values ​​of various data when the product is working normally. This will allow for comparison between the actual operating values ​​and the standard operating values, making it easier to identify abnormal operating conditions and adjust parameters accordingly to ensure normal operation under abnormal conditions.

[0059] In this embodiment, the standard pressure is 2000 Pa.

[0060] Setting the standard pressure to 2000Pa best matches the environmental conditions in daily use, thus ensuring the most accurate calibration of the standard operating conditions.

[0061] Step S2 also includes S2.1. Detecting the current I of the proportional valve. When the current I reaches the preset flow current IA, the gas flow value G is detected by the gas flow sensor 5.

[0062] When a gas water heater is working, it first determines whether the current through the proportional valve reaches the current IA required when the gas intake volume reaches the preset gas flow rate GA under standard operating conditions. Then, it verifies whether the actual gas flow rate G reaches GA. This avoids the problem of poor adjustment accuracy caused by accidental triggering of adjustment when the gas water heater is still in the start-up state.

[0063] This method also includes step S2.2. When the actual gas flow rate G reaches the preset gas flow rate GA, compare the difference ΔA between the current I of the proportional valve at that time and the preset flow current IA. If ΔA is greater than the preset alarm current difference IN, then execute step S4.

[0064] Step S4. Alarm notification to the user.

[0065] By setting a preset alarm current difference, the severity of the fault is determined by detecting the difference between the actual operating parameters and the preset parameters under standard operating conditions. When the difference is small, it indicates a minor fault with little impact on the gas water heater, and the operating parameters are automatically adjusted to meet normal operating requirements. When the difference is large and exceeds the preset alarm value, it indicates a very serious fault that may affect the normal operation of the water heater, and an alarm is automatically triggered to facilitate a quick on-site inspection and repair by a service technician.

[0066] In this embodiment, step S1.2 is also included: pre-calibrating the gas water heater to determine the value of the preset alarm current difference IN.

[0067] Before operation, pre-calibrating different gas water heaters based on the preset alarm current difference IN can more accurately determine more suitable preset alarm values ​​for different water heaters and different working environments, making the alarm more accurate and improving the user experience.

[0068] In this embodiment, step S1.2 specifically includes:

[0069] Step S1.2.1. Set the gas supply pressure to the standard pressure state; test and record the current I1 passing through the proportional valve under each preset gas flow value GA state;

[0070] Step S1.2.2. Set the gas supply pressure to a low pressure state; test and record the current I2 passing through the proportional valve under each preset gas flow rate value GA state.

[0071] Step S1.2.3. Calculate IN = I2 - I1.

[0072] During pre-calibration, by adjusting the entire machine to standard pressure and low pressure states and obtaining the corresponding differences, the severity of the blockage can be intuitively reflected. The preset alarm state is determined based on the above differences, making the preset alarm values ​​more reasonable and the alarms more accurate.

[0073] In this embodiment, in step S1.2.1, the standard pressure state can be set to 2000 Pa. In step S1.2.2, the low pressure state can be set to 800 Pa.

[0074] Setting the standard pressure to 2000Pa best matches the environmental conditions in daily use, thus ensuring the most accurate calibration of standard operating conditions. Meanwhile, setting the low pressure to 800Pa accurately simulates the environmental conditions when the water heater experiences a low gas pressure malfunction, facilitating timely alarm notification to the user.

[0075] like Figure 2 As shown, a preferred embodiment of a constant gas flow method for a gas water heater is provided, which specifically includes the following steps:

[0076] S1. Perform pre-calibration work, set the gas supply pressure to the standard pressure state; test and record the current I1 through the proportional valve under each preset gas flow value GA state; set the gas supply pressure to the low pressure state; test and record the current I2 through the proportional valve under each preset gas flow value GA state.

[0077] In this embodiment, the standard pressure state can be set to 2000 Pa. In step S1.2.2, the low pressure state can be set to 800 Pa.

[0078] S2. The calculation yields IN = I2 - I1;

[0079] S3. The gas water heater is turned on and working. Set the preset gas flow value GA and open the gas proportional valve.

[0080] S4. Detect the current I of the proportional valve. When the current I reaches the preset flow current IA, the gas flow value G is detected by the gas flow sensor 5.

[0081] S5. Compare whether the actual gas flow rate G is less than the preset gas flow rate GA. If not, repeat step S5 and then step S7. If yes, then step S6.

[0082] S6. Increase the current I of the proportional valve to increase the opening degree of the proportional valve, and then execute S5;

[0083] S7. When the actual gas flow rate G reaches the preset gas flow rate GA, compare the difference ΔA between the current I of the proportional valve and the preset flow current IA. If ΔA is greater than the preset alarm current difference IN, then execute step S8.

[0084] S8. The error type corresponding to the alarm from the alarm device.

[0085] In this embodiment, when ΔA is greater than IN, the alarm device notifies the user that the gas pressure is too low.

[0086] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for maintaining constant gas flow in a gas water heater, characterized in that, Includes the following steps: S1. Set the preset gas flow rate value GA and open the gas proportional valve; S2. Detect the actual gas flow value G using a gas flow sensor, and compare whether the actual gas flow value G is less than the preset gas flow value GA. If not, repeat step S2; if yes, repeat step S3. S3. Increase the current I of the proportional valve to increase the opening degree of the proportional valve, and then repeat S2. Step S1 includes: S1.

1. Calibrate the gas intake of the proportional valve of the gas water heater under standard pressure conditions, and determine the preset flow current IA when the proportional valve meets the preset gas flow value GA. Step S2 includes: S2.

1. Detect the current I of the proportional valve. When the current I reaches the preset flow current IA, detect the gas flow value G through the gas flow sensor. S2.

2. When the actual gas flow rate G reaches the preset gas flow rate GA, compare the difference ΔA between the current I of the proportional valve at that time and the preset flow current IA. If ΔA is greater than the preset alarm current difference IN, then an alarm will be triggered to alert the user.

2. The gas constant flow operation method for a gas water heater as described in claim 1, characterized in that, The standard pressure is 2000 Pa.

3. The gas constant flow operation method for a gas water heater as described in claim 1, characterized in that, Step S1 also includes: S1.

2. Performing pre-calibration on the gas water heater to determine the value of the preset alarm current difference IN.

4. The gas constant flow operation method for a gas water heater as described in claim 3, characterized in that, S1.2 specifically includes: S1.2.

1. Set the gas supply pressure to the standard pressure state, test and record the current I1 passing through the proportional valve under each preset gas flow value GA state; S1.2.

2. Set the gas supply pressure to a low pressure state, test and record the current I2 passing through the proportional valve under each preset gas flow rate value GA state; S1.2.

3. The calculation yields IN = I2 - I1.

5. The gas constant flow operation method for a gas water heater as described in claim 4, characterized in that, In S1.2.1, the standard pressure state is set to 2000 Pa; In S1.2.2, the low pressure state is set to 800 Pa.

6. A gas water heater used in the constant gas flow operation method of a gas water heater as described in any one of claims 1-5, characterized in that, The gas water heater includes a gas valve assembly, a gas flow sensor, and a control device. The gas flow sensor is installed at the gas inlet of the gas water heater, and the control device can control the current of the proportional valve in the gas valve assembly based on the value fed back by the gas flow sensor.

7. The gas water heater as described in claim 6, characterized in that, The gas water heater also includes an alarm device, and the control device can control the alarm device to alarm for faults based on the value fed back by the gas flow sensor.

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