A method and apparatus for switching a fire grate of a gas appliance

Abstract

The application discloses a gas appliance fire grate switching method and a fire grate switching device. The fire grate switching method comprises the following steps: acquiring an inlet pressure value of gas; judging whether the inlet pressure value is lower than a normal pressure value; if yes, switching the combustion quantity of the fire grate when the actual power of the fire grate reaches a corrected switching valve power; and the corrected switching valve power is less than a theoretical switching valve power. In the embodiment, the corrected switching valve power is set, and the corrected switching valve power is less than the theoretical switching valve power. The corrected switching valve power can correspond to the later stage of the fire grate power section. In this way, the upper limit value of the switching fire grate power of each fire grate section can be reduced, the actual power of the fire grate can correspond to the corrected switching valve power, and the valve can be switched in advance. Thus, the great deviation between the theoretical combustion power and the actual power can be prevented, and the temperature can be prevented from suddenly increasing after the fire grate is switched.

Description

Technical Field

[0001] This invention relates to the field of gas appliances, and more specifically to a burner switching method and burner switching device for a gas appliance. Background Technology

[0002] Gas appliances are now widely used, such as gas water heaters and wall-hung boilers, to provide users with hot water quickly in daily life. Gas water heaters also include those that burn different energy types, such as liquefied petroleum gas (LPG) and natural gas. Under standard conditions, the standard inlet pressure of natural gas entering a gas water heater is 2000 Pa. However, due to differences in actual conditions in each user's home, such as high altitude, high-rise buildings, or aging natural gas pipelines, the inlet pressure may be lower than the standard inlet pressure of 2000 Pa.

[0003] like Figure 2 As shown, when the intake pressure is less than 2000 Pa, the flame remains normal in the early and middle stages of the burner power range during actual use. However, in the later stages of the burner power range, due to insufficient intake pressure, the actual power cannot increase, failing to reach the theoretical combustion power, thus failing to meet the conditions for burner shut-off. This is because the actual power does not match the theoretical power, resulting in insufficient flame and a persistent temperature difference between the set and actual water temperatures. Meanwhile, the theoretical power continues to rise, eventually reaching the theoretical power value for burner shut-off, at which point the burner valve is activated.

[0004] After switching to a new burner, the intake pressure meets the requirements as it is in the early stage of a new burner. The actual power is quickly adjusted according to the theoretical power, resulting in a sharp increase in actual power, a sudden increase in flame size, and a sudden increase in water temperature, which may far exceed the set temperature and even pose a safety hazard of burns. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is that when the gas inlet pressure of a gas appliance is insufficient, the water supply temperature may far exceed the set temperature, posing a safety hazard of scalding. Therefore, a method and device for switching the burner of a gas appliance are provided.

[0006] This invention provides a method for switching burner bars in a gas appliance, the method comprising:

[0007] Obtain the gas intake pressure value;

[0008] Determine if the intake pressure is lower than the normal pressure value;

[0009] If so, the number of burners to be switched when the actual power of the burner reaches the corrected valve power; the corrected valve power is less than the theoretical valve power.

[0010] Optionally, the corrected valve power can be determined based on the relationship between the intake pressure value and the corrected valve power.

[0011] Optionally, the firebox switching method includes:

[0012] The correction power value is determined based on the intake pressure value and the normal pressure value; the normal pressure value is 2000pa, and the correction power value is the power value required to adjust the theoretical valve cutting power to the correction valve cutting power.

[0013] The corrected valve-cutting power is determined based on the relationship between the corrected power value and the theoretical valve-cutting power.

[0014] Optionally, the corrected valve-cutting power is determined based on the difference between the corrected power value and the theoretical valve-cutting power.

[0015] Alternatively, the corrected valve power can be determined using the following formula:

[0016]

[0017]

[0018] Among them, P C To correct the power value, P H P is the corrected shut-off valve power adjusted when the intake pressure is insufficient. H0 P is the theoretical valve cutting power at an intake pressure of 2000 Pa. L0 This represents the minimum power value at an intake pressure of 2000 Pa, where p is the intake pressure value.

[0019] Optionally, the firebox switching method further includes:

[0020] Obtain theoretical combustion power;

[0021] Control the burner to achieve combustion at the theoretical combustion power;

[0022] The actual power is determined based on the flame parameters during the combustion process.

[0023] Optionally, the firebox switching method further includes:

[0024] Obtain the set water temperature and actual water temperature of hot water in gas appliances;

[0025] The theoretical combustion power is determined based on the difference between the set water temperature and the actual water temperature.

[0026] This invention also provides a burner switching device for a gas appliance, the burner switching device comprising:

[0027] A pressure sensor is used to obtain the intake pressure value of the gas.

[0028] The processing module is used to determine whether the intake pressure value is lower than the normal pressure value;

[0029] The control module is used to cut the valve when the actual power of the fire bar reaches the corrected valve cutting power; the corrected valve cutting power is less than the theoretical valve cutting power.

[0030] This invention also provides an electronic device, which includes a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the fire switch method of any of the above embodiments.

[0031] This invention also provides a computer-readable storage medium storing computer instructions for causing a computer to execute the fire bar switching method of any of the above embodiments.

[0032] The embodiments of the present invention have the following beneficial effects:

[0033] 1. This invention provides a method for switching burners in a gas appliance. The method includes: obtaining the gas inlet pressure value; determining whether the inlet pressure value is lower than the normal pressure value; if so, switching the number of burners when the actual power of the burner reaches the corrected valve cutting power; the corrected valve cutting power is less than the theoretical valve cutting power.

[0034] When the actual intake pressure of the gas is detected to be insufficient, meaning it is lower than the normal pressure, it indicates that the burner power level remains normal in the early to mid-stages of the burner power range. However, in the later stages of the burner power range, the actual power cannot increase, preventing it from reaching the theoretical combustion power and thus failing to meet the conditions for burner shut-off. Therefore, this embodiment sets a corrected shut-off power, which is lower than the theoretical shut-off power. This corrected shut-off power corresponds to the later stages of the burner power range, thus lowering the upper limit of the burner power and ensuring that the actual burner power corresponds to the corrected shut-off power, allowing for earlier shut-off. This prevents a large deviation between the theoretical and actual combustion power, which could lead to a sudden temperature increase after burner shut-off. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a graph showing the relationship between burner combustion power and proportional valve duty cycle when intake pressure is normal.

[0037] Figure 2 This is a graph showing the relationship between burner combustion power and proportional valve duty cycle when intake pressure is abnormal.

[0038] Figure 3 This is a flowchart illustrating the fire-grate switching method according to an embodiment of the present invention. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0040] like Figure 3 As shown, the present invention provides a burner switching method for a gas appliance, which may include the following steps:

[0041] S1. Obtain the gas intake pressure value;

[0042] During normal use of gas appliances, the normal pressure in the gas inlet pipe is generally 2000 Pa. Gas appliances typically use proportional valves to regulate the amount of gas supplied to the burner. The burner's combustion power is usually directly proportional to the proportional valve's duty cycle; that is, the burner's combustion power increases as the proportional valve's duty cycle increases, and decreases as the proportional valve's duty cycle decreases. Furthermore, adjusting the actual burner power is usually done directly by adjusting the proportional valve's duty cycle. A higher proportional valve duty cycle means a larger valve opening, resulting in a larger gas flow and higher actual burner power. Conversely, a lower proportional valve duty cycle means a smaller valve opening, resulting in a smaller gas flow and lower actual burner power. Figure 1 The diagram shows the relationship between burner combustion power and proportional valve duty cycle when the intake pressure is normal. Due to varying conditions in each user's home—such as high altitude, high-rise buildings, or aging natural gas pipelines—the intake pressure may be 2000 Pa lower than the normal intake pressure. Figure 2 The figure shows the relationship between burner combustion power and proportional valve duty cycle when intake pressure is abnormal. P1 is the theoretical valve-cutting power, P2 is the initial power after valve cutting, BL is the minimum proportional valve duty cycle, and BH is the maximum proportional valve duty cycle.

[0043] To achieve precise power control, water heaters use two, four, or six burners, each with a corresponding power output. When the required power is low, the second burner operates. As the required power increases and exceeds the second burner's power limit, the system switches to the fourth burner, and vice versa. It can also switch from a high-power burner to a lower-power burner. Therefore, if the intake pressure is below 2000 Pa, switching burners can easily lead to a sudden increase in actual power, a sudden increase in flame size, and a sudden increase in water temperature.

[0044] Therefore, it is necessary to first install monitoring equipment in the intake pipeline to obtain the intake pressure value in the intake pipeline.

[0045] S2. Determine if the intake pressure is lower than the normal pressure value;

[0046] Specifically, since the normal intake pressure may vary in different areas during actual use, after obtaining the actual intake pressure, it is necessary to compare it with the pre-input normal pressure value in the system to determine whether the intake pressure is lower than the normal pressure value. This will determine whether the actual valve-cutting power needs to be changed. Normally, the actual valve-cutting power at the normal pressure corresponds to the theoretical valve-cutting power. If the intake pressure is lower than the normal pressure, then the actual valve-cutting power needs to be changed.

[0047] S3. If so, when the actual power of the burner reaches the corrected valve power, switch the number of burners to burn; the corrected valve power is less than the theoretical valve power.

[0048] If the intake pressure is lower than the normal pressure, it indicates that the actual valve-cutting power does not correspond to the theoretical valve-cutting power. This can easily lead to a sudden increase in actual power, a sudden increase in flame size, and a sudden increase in water temperature. Currently, the valve-cutting mechanism of the burner is to cut the valve when the current burner's power limit is reached. Therefore, this embodiment reduces the power limit to make the corrected valve-cutting power less than the theoretical valve-cutting power, that is, to reduce the current burner's power limit to the corrected valve-cutting power.

[0049] In this way, when the actual power of the burner reaches the corrected shut-off power, the number of burners can be switched in advance. This allows the corrected shut-off power to avoid the theoretical shut-off power, that is, to avoid the later stages of the burner power range, thus preventing a large deviation between the theoretical and actual power, which could lead to a sudden increase in temperature after the burner is switched off.

[0050] Regarding the specific value of the corrected valve cutting power, when the inlet pressure is lower than the normal value, those skilled in the art can detect the temperature difference between the set temperature and the actual temperature of the water. If the temperature difference does not decrease after a certain time point, but instead remains constant or increases, then the actual power at that time point can be obtained and determined as the corrected valve cutting power. Of course, to ensure the accuracy of the corrected valve cutting power, those skilled in the art can obtain it through multiple measurements.

[0051] To ensure user flexibility and prevent gas appliances from failing to adjust automatically, a display screen showing the inlet gas pressure and a correction button can be installed on the gas appliance. The display screen communicates with the monitoring equipment. When the user sees that the inlet gas pressure is lower than the normal inlet gas pressure, to avoid being scalded by hot water, they can manually adjust the burner valve power using the correction button. After pressing the correction button, the gas appliance system automatically adjusts the valve power to correspond to the inlet gas pressure value.

[0052] This embodiment is merely an example of how to obtain the power of the corrected valve, but it is not intended to limit the scope of the invention. Those skilled in the art can modify the invention according to the actual situation, as long as the same technical effect can be achieved.

[0053] Furthermore, in an optional embodiment of the present invention, it further includes:

[0054] S4. Determine the corrected valve power based on the relationship between the intake pressure value and the corrected valve power.

[0055] In this embodiment of the invention, the corrected valve-cutting power can be determined based on the relationship between the intake pressure value and the corrected valve-cutting power. For example, those skilled in the art can determine the functional relationship between multiple sets of intake pressure values ​​and the valve-cutting power of the burner by obtaining comparative data between the two, and thus determine the valve-cutting power corresponding to different intake pressure values. Therefore, after the intake pressure value is determined, the corresponding corrected valve-cutting power can be obtained.

[0056] Of course, this embodiment is merely an example to illustrate the relationship between the two, but it does not limit the scope of the invention. Those skilled in the art can make changes based on actual circumstances to achieve the same technical effect.

[0057] Furthermore, in an optional embodiment of the present invention, the fire bar switching method includes:

[0058] S41. Determine the corrected power value based on the intake pressure value and the normal pressure value;

[0059] The corrected power value is the power adjustment required to change the theoretical valve-cutting power to the corrected valve-cutting power. Specifically, in this embodiment of the invention, the corrected power value can be determined based on the ratio or difference between the intake pressure value and the normal pressure value. For example, if the ratio between the intake pressure value and the normal pressure value is 5 / 8, then the difference in corrected power can be determined as 3 / 8 of the theoretical valve-cutting power. Alternatively, if there is a difference between the intake pressure value and the normal pressure value, the corrected power value can be obtained by multiplying the pressure difference by a certain proportional coefficient.

[0060] Of course, this embodiment is merely an example of how to obtain the corrected power value, but it does not limit the scope of the invention. Those skilled in the art can make changes based on actual circumstances to achieve the same technical effect.

[0061] S42. Determine the corrected valve-cutting power based on the relationship between the corrected power value and the theoretical valve-cutting power.

[0062] After the corrected power value is determined, the corrected valve-cutting power can be determined based on the relationship between the corrected power value and the theoretical valve-cutting power. The corrected power value and the theoretical valve-cutting power can be directly proportional or have other functional relationships.

[0063] Specifically, the corrected valve-cutting power can be determined based on the difference between the corrected power value and the theoretical valve-cutting power. For example, the corrected valve-cutting power can be determined using the following formula:

[0064]

[0065]

[0066] Among them, P C To correct the power value, P H P is the corrected shut-off valve power adjusted when the intake pressure is insufficient. H0 P is the theoretical valve cutting power at an intake pressure of 2000 Pa. L0 This represents the minimum power value at an intake pressure of 2000 Pa, where p is the intake pressure value.

[0067] Furthermore, in an optional embodiment of the present invention, the fire bar switching method further includes:

[0068] S5. Obtain the theoretical combustion power;

[0069] S6. Control the burner to burn at the theoretical combustion power;

[0070] S7. Determine the actual power based on the flame parameters during the combustion process.

[0071] The theoretical combustion power can be set automatically by the system based on the intake pressure, or it can be preset by technicians based on typical operating parameters. The burner is then controlled to burn at the theoretical combustion power. However, in actual combustion, the theoretical combustion power varies, resulting in different flame parameters. Because the actual operating environment of gas appliances differs, the flame parameters will differ from the theoretical values. Therefore, the actual combustion power can be obtained by measuring the actual flame parameters.

[0072] Specifically, the firebox switching method also includes:

[0073] S51. Obtain the set water temperature and actual water temperature of hot water in the gas appliance;

[0074] S52. Determine the theoretical combustion power based on the difference between the set water temperature and the actual water temperature.

[0075] In actual use, users need to set their own shower water temperature, which is called the set water temperature. Then, the actual water temperature is obtained by a temperature detection device inside the hot water tank of the gas appliance. The system then determines the theoretical combustion power based on the difference between the received set temperature and the actual temperature. It then continuously adjusts the theoretical combustion power value based on feedback from the actual water temperature to control the actual power until a dynamic equilibrium is reached.

[0076] This invention also provides a burner switching device for a gas appliance, the burner switching device comprising:

[0077] A pressure sensor is used to obtain the intake pressure value of the gas.

[0078] The processing module is used to determine whether the intake pressure value is lower than the normal pressure value;

[0079] The control module is used to cut the valve when the actual power of the fire bar reaches the corrected valve cutting power; the corrected valve cutting power is less than the theoretical valve cutting power.

[0080] This invention also provides an electronic device, which may include a processor and a memory, wherein the processor and the memory can be connected via a bus or other means, taking a bus connection as an example.

[0081] The processor can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0082] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the flamepole switching method in the embodiments of the present invention. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory, thereby implementing the flamepole switching method in the above method embodiments.

[0083] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor, etc. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0084] One or more modules are stored in memory and, when executed by the processor, perform any of the fire bar switching methods described in the above embodiments.

[0085] The specific details of the above-mentioned electronic device can be understood by referring to the relevant descriptions and effects in any of the above embodiments, and will not be repeated here.

[0086] Example 4

[0087] This invention also provides a computer-readable storage medium storing computer instructions for causing a computer to execute any of the fire switch methods.

[0088] The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memory.

[0089] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for switching burner bars in a gas appliance, characterized in that, include: Obtain the gas intake pressure value; Determine whether the intake pressure value is lower than the normal pressure value; If so, the number of burners to be switched when the actual power of the burner reaches the corrected valve power; the corrected valve power is less than the theoretical valve power. The corrected power value is determined based on the intake pressure value and the normal pressure value; the normal pressure value is 2000 Pa. The corrected valve-cutting power is determined based on the difference between the corrected power value and the theoretical valve-cutting power.

2. The fire bar switching method according to claim 1, characterized in that, The power of the corrected valve is determined by the following formula: ; ; Among them, P C For the corrected power value, P H The corrected power of the valve, P, is adjusted when the intake pressure is insufficient. H0 The theoretical valve cutting power, P, is given by the inlet pressure of 2000 Pa. L0 This represents the minimum power value at an intake pressure of 2000 Pa, where p is the intake pressure value.

3. The fire bar switching method according to claim 1 or 2, characterized in that, Also includes: Obtain theoretical combustion power; The burner is controlled to burn at the theoretical combustion power; The actual power is determined based on the flame parameters during the combustion process.

4. The fire bar switching method according to claim 3, characterized in that, Also includes: Obtain the set water temperature and actual water temperature of hot water in gas appliances; The theoretical combustion power is determined based on the difference between the set water temperature and the actual water temperature.

5. A burner switching device for a gas appliance, characterized in that, include: A pressure sensor is used to obtain the intake pressure value of the gas. The processing module is used to determine whether the intake pressure value is lower than the normal pressure value; The control module is used to switch the number of burners when the actual power of the burner reaches the corrected valve power, provided that the intake pressure is lower than the normal pressure. The corrected valve power is less than the theoretical valve power. The corrected power value is determined based on the intake pressure and the normal pressure. The normal pressure is 2000 Pa. The corrected valve power is determined based on the difference between the corrected power value and the theoretical valve power.

6. An electronic device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the fire bar switching method of any one of claims 1-4 by executing the computer instructions.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the fire bar switching method according to any one of claims 1-4.

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