A device and method for measuring a primary air coefficient of a cooking appliance

Abstract

The application discloses a kind of determination device and determination method of primary air coefficient of range, and the range includes fire cover, and the outer side wall of fire cover includes multiple sampling holes;The determination device includes sampling tube module, gas analysis module and data processing module;One end of sampling tube module is communicated with each sampling hole, and sampling tube module is used to sample mixed gas inside the cavity of fire cover;The other end of sampling tube module is communicated with gas analysis module, and gas analysis module is used to carry out component analysis to the mixed gas obtained by sampling, to determine the gas type contained in mixed gas and corresponding volume content;Data processing module is electrically connected with gas analysis module, and data processing module is used to determine the primary air coefficient corresponding to range according to the gas type contained in mixed gas and corresponding volume content.The determination device determines the supply amount of primary air, obtains the measured value of the true primary air coefficient, to effectively guide the design and research and development of combustor structure.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a device and method for measuring the primary air coefficient of a stove. Background Technology

[0002] Stoves are essential kitchen cooking appliances in daily household life. Currently, most household gas stoves use atmospheric burners. During use, gas is injected from the nozzle and then naturally ejected to form a gas mixture. This mixture then flows to the burner's flame holes for combustion, with secondary air supplied from the space around the flame holes for continuous combustion.

[0003] In existing burners, the supply of primary and secondary air affects the combustion efficiency of the gas, thus impacting the energy efficiency rating of the gas stove. To improve the energy efficiency of gas stoves, manufacturers typically employ various methods during the burner design process to increase the amount of primary air supplied, thereby increasing the primary air coefficient. Furthermore, manufacturers often utilize simulation software to calculate the impact of the burner's structure on the primary air coefficient. While this saves on R&D costs and time, the simulated values ​​deviate significantly from the actual primary air coefficient, offering limited guidance for burner structural design. Summary of the Invention

[0004] This invention provides a device and method for measuring the primary air coefficient of a stove. By measuring the amount of primary air supplied, the actual measured value of the primary air coefficient is obtained, thereby effectively guiding the design and development of the burner structure and solving the problem that the simulated value obtained by simulation software in the existing manufacturing process has a large deviation from the actual primary air coefficient.

[0005] In a first aspect, embodiments of the present invention provide a device for measuring the primary air coefficient of a stove, the stove including a burner cap, the outer wall of the burner cap including a plurality of sampling holes, each of the sampling holes communicating with the interior of the cavity of the burner cap;

[0006] The measuring device includes a sampling tube module, a gas analysis module, and a data processing module;

[0007] One end of the sampling tube module is connected to each of the sampling holes, and the sampling tube module is used to sample the mixed gas inside the cavity of the flame cap through each of the sampling holes;

[0008] The other end of the sampling tube module is connected to the gas analysis module, which is used to perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents.

[0009] The data processing module is electrically connected to the gas analysis module. The data processing module is used to determine the primary air coefficient of the stove based on the types of gases contained in the mixed gas and their corresponding volume contents.

[0010] Secondly, embodiments of the present invention also provide a method for determining the primary air coefficient of a stove, the stove including a burner cap, the outer wall of the burner cap including a plurality of sampling holes, each of the sampling holes communicating with the interior of the cavity of the burner cap;

[0011] The determination method includes:

[0012] The mixed gas inside the cavity of the flame cap is sampled through each of the sampling holes;

[0013] The sampled mixed gas is subjected to component analysis to determine the types of gases contained in the mixed gas and their corresponding volume contents;

[0014] The primary air coefficient of the stove is determined based on the types of gases contained in the mixed gas and their corresponding volume contents.

[0015] This invention provides a device and method for measuring the primary air coefficient of a stove. The stove includes a burner cap, and the outer wall of the burner cap includes multiple sampling holes, each of which communicates with the interior of the burner cap cavity. The measuring device includes a sampling tube module, a gas analysis module, and a data processing module. One end of the sampling tube module is connected to each sampling hole, and the sampling tube module is used to sample the mixed gas inside the burner cap cavity through each sampling hole. The other end of the sampling tube module is connected to the gas analysis module, and the gas analysis module is used to perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents. The data processing module is electrically connected to the gas analysis module, and the data processing module is used to determine the primary air coefficient of the stove based on the types of gases contained in the mixed gas and their corresponding volume contents. This measuring device samples the mixed gas inside the burner cavity through a sampling tube module and performs component analysis on the sampled mixed gas through a gas analysis module. This allows for the measurement of the primary air supply to the burner of the stove. Based on the primary air supply and the corresponding gas volume, the primary air coefficient of the stove is determined, thus obtaining the actual measured value of the true primary air coefficient. This improves the accuracy and efficiency of the primary air coefficient measurement, effectively guiding the design and development of the burner structure, ensuring complete combustion and high combustion efficiency, improving the energy efficiency rating of the gas stove, and providing users with a better cooking experience. It also solves the problem that the simulation values ​​obtained by existing manufacturing processes, which mainly rely on simulation software calculations, have a large deviation from the actual primary air coefficient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a stove and a primary air coefficient measuring device provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall structure of another stove and a primary air coefficient measuring device provided in an embodiment of the present invention;

[0018] Figure 3 This is an exploded structural diagram of a stove and a primary air coefficient measuring device provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the overall structure of a flame cap provided in an embodiment of the present invention;

[0020] Figure 5 This is a cross-sectional structural schematic diagram of the outlet area of ​​the sampling hole and the flame outlet of a flame cap provided in an embodiment of the present invention.

[0021] Figure 6 This is a cross-sectional structural diagram showing the depth of the sampling hole and the flame outlet hole of a flame cap provided in an embodiment of the present invention.

[0022] Figure 7 This is a cross-sectional structural diagram of the angle between the sampling hole and the flame outlet of a flame cap and the horizontal plane, as provided in an embodiment of the present invention.

[0023] Figure 8 This is a flowchart illustrating a method for determining the primary air coefficient of a stove according to an embodiment of the present invention.

[0024] Figure 9 This is a flowchart illustrating another method for determining the primary air coefficient of a stove provided in an embodiment of the present invention;

[0025] Figure 10 This is a flowchart illustrating another method for determining the primary air coefficient of a stove provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10-Furnace head; 11-Ejector tube; 12-Mixing chamber; 20-Gas distribution plate; 30-Flame cap; 31-Sampling hole; 32-Flame outlet hole; 40-Sampling tube module; 50-Gas analysis module; 60-Data processing module; 70-Annular connection module; 80-Thermocouple module. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0029] This invention provides a device for measuring the primary air coefficient of a stove. Figure 1 This is a schematic diagram of the overall structure of a stove and a primary air coefficient measuring device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the overall structure of another stove and primary air coefficient measuring device provided in an embodiment of the present invention. Figure 3 This is an exploded structural diagram of a stove and a primary air coefficient measuring device provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the overall structure of a flame cap provided in an embodiment of the present invention, as shown below. Figures 1-4 As shown, the working principle of this stove will first be briefly explained. The stove includes a burner head 10, a gas distribution plate 20, and a burner cap 30. The burner head 10 and the burner cap 30 are located on opposite sides of the gas distribution plate 20, and the interiors of the burner head 10, the gas distribution plate 20, and the burner cap 30 are interconnected. The burner head 10 includes an injector tube 11 and a mixing chamber 12, and the end of the injector tube 11 is connected to the interior of the mixing chamber 12. That is, the interiors of the mixing chamber 12, the gas distribution plate 20, and the burner cap 30 are interconnected. During the use of this stove, gas is injected through the nozzle into the injector tube 11 of the burner head 10, where it is naturally ejected to form a gas mixture. This mixture then flows into the mixing chamber 12 of the burner head 10. Afterward, the gas mixture flows to the flame outlet 32 ​​of the burner cap 30 for combustion. Secondary air is supplied from the space surrounding the flame outlet 32, and the mixture is ignited at the burner cap 30 for continuous combustion. In other words, during the use of this stove, air is introduced into the injector tube 11 for primary air mixing, and then further mixed with air a second time through the burner cap 30 before combustion. This embodiment does not impose specific requirements or limitations on the specific structures of the burner head 10, the gas distribution plate 20, and the burner cap 30; they can be designed and developed according to actual needs.

[0030] For this type of stove, the primary air coefficient α is a core combustion parameter. Most household gas stoves currently use atmospheric burners, and the primary air coefficient α can also be understood as a core combustion parameter for the burner. When gas is injected at a certain speed into an infinite space filled with a stationary medium, it forms a free jet, simultaneously entraining some air into the gas-fuel mixture. Atmospheric burners rely on the negative pressure generated by the high-speed airflow formed after the gas passes through the nozzle, which draws surrounding air into the mixing chamber 12. Within the mixing chamber 12, the gas collides and mixes, finally flowing out evenly from the flame outlet 32 ​​of the burner cap 30 for combustion, forming a Bunsen flame. This entrained air is called primary air. When the primary air coefficient α is too low, incomplete combustion of fuel gases and low combustion efficiency can easily occur. Specifically, hydrocarbons in the fuel gases decompose at high temperatures, producing free carbon in a white-hot state. The tip of the inner flame appears reddish-yellow. When air circulates, if the flame is not obstructed and the temperature is high, this free carbon will completely dissipate as carbon dioxide and water vapor. However, under poor combustion conditions, this free carbon cannot react completely and passes through the outer flame, resulting in unclear flame layers and incomplete combustion. The flue gas then contains a large amount of carbon monoxide. Prolonged exposure to low concentrations of carbon monoxide can cause chronic poisoning, leading to symptoms such as anemia, paleness, palpitations, fatigue, indigestion, weight loss, headaches, insomnia, and memory loss. In severe cases, it can damage the nervous system. Furthermore, the continuous yellow flame from incomplete combustion will accumulate carbon, easily blackening the bottom of the pot. When the primary air coefficient α is too high, undesirable conditions such as flame detachment can easily occur, which is also detrimental to the effective utilization of hydrocarbons in the fuel gases. The larger the primary air coefficient α, the more primary air is ejected by the ejector tube 11, which is beneficial to the complete combustion of the fuel gas. The smaller the primary air coefficient α, the less primary air is ejected by the ejector tube 11, which is not conducive to the complete combustion of the fuel gas. For example, the range of the primary air coefficient α can be 0 < α < 1, or the range of the primary air coefficient α can be 0.45 < α < 0.75, or the range of the primary air coefficient α can be 0.68 < α < 0.72. It can be selected according to the actual research and development needs.

[0031] Furthermore, it should be noted that the theoretical simulation and practical test results of the primary air coefficient α do not correspond well, which has always been a difficult problem in stove development. Accurate sampling and measurement of the primary air coefficient α for this stove can compensate for the shortcomings of traditional experience-based design. Therefore, it is necessary to accurately measure the primary air coefficient α for the stove.

[0032] The working principle of the device for measuring the primary air coefficient α of this stove is explained in detail below. Please refer to [link / reference]. Figures 1-4The outer wall of the burner cap 30 in the stove includes multiple sampling holes 31, each of which is connected to the interior of the burner cap 30 cavity. The measuring device includes a sampling tube module 40, a gas analysis module 50, and a data processing module 60. One end of the sampling tube module 40 is connected to each sampling hole 31, and the sampling tube module 40 is used to sample the mixed gas inside the burner cap 30 cavity through each sampling hole 31. The other end of the sampling tube module 40 is connected to the gas analysis module 50, and the gas analysis module 50 is used to perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents. The data processing module 60 is electrically connected to the gas analysis module 50, and the data processing module 60 is used to determine the primary air coefficient α corresponding to the stove based on the types of gases contained in the mixed gas and their corresponding volume contents.

[0033] Specifically, the outer wall of the burner cap 30 in this stove includes multiple sampling holes 31, each of which communicates with the interior of the burner cap 30 cavity. Exemplarily, each sampling hole 31 can be understood as a through-hole structure. The number, position, and size of each sampling hole 31 can be selected according to actual needs, and this embodiment does not limit this. Exemplarily, the number of sampling holes 31 can be two, the two sampling holes 31 can be arranged adjacent to each other, and the two sampling holes 31 can be the same or different in size. Alternatively, exemplarily, each sampling hole 31 can be arranged in multiple rows and columns. This embodiment uses two sampling holes 31 as an example for drawing and explanation.

[0034] One end of the sampling tube module 40 is connected to each sampling hole 31, meaning one end of the sampling tube module 40 can communicate with the interior of the burner cap 30's cavity. The mixed gas inside the burner cap 30's cavity can further flow into the sampling tube module 40, which can then sample the mixed gas inside the burner cap 30's cavity through each sampling hole 31. For example, the mixed gas inside the burner cap 30's cavity contains fuel gas and ejected primary air. Thus, the sampling tube module 40 can extract a portion of the mixed gas inside the burner cap 30's cavity to the outside of the stove for analysis and measurement of the primary air coefficient α, without affecting the normal use of the stove, maintaining gas flow and combustion stability. It can measure the primary air volume and calculate the primary air coefficient α during the stove's use, thus improving the accuracy of the measured value of the primary air coefficient α.

[0035] The other end of the sampling tube module 40 is connected to the gas analysis module 50. The sampling tube module 40 can then transmit the sampled mixed gas from inside the burner cap 30 cavity to the gas analysis module 50, allowing the gas analysis module 50 to perform component analysis on the sampled mixed gas, determining the types of gases contained in the mixed gas and their corresponding volume content. The gas analysis module 50 is a process analysis instrument for measuring gas composition. It mainly uses a gas sensor to detect the types of gases present in the sampled mixed gas. The gas sensor is used to detect the composition and corresponding volume content of gases, enabling rapid, real-time, and high-precision acquisition of the types of gases contained in the mixed gas and their corresponding volume content. It can be used as a preferred solution and widely applied in the development of stoves. For example, the gas analysis module 50 can be a thermal conductivity gas analyzer, an electrochemical gas analyzer, an infrared absorption analyzer, a gas chromatograph, etc.

[0036] Furthermore, the gas analysis module 50 is electrically connected to the data processing module 60. The gas analysis module 50 can transmit the identified gas types and corresponding volume contents of the mixed gas to the data processing module 60, so that the data processing module 60 can determine the primary air coefficient α corresponding to the stove based on the gas types and corresponding volume contents of the mixed gas. The mixed gas inside the burner cap 30 cavity contains fuel gas and ejected primary air. The primary air coefficient α corresponding to the stove is related to the actual ejected primary air volume (which can also be understood as the primary air supply volume) and the primary air volume required for complete combustion of the fuel gas (a certain volume of fuel gas requires a certain amount of air for complete combustion). For example, the primary air coefficient α corresponding to the stove can be the ratio of the actual ejected primary air volume to the primary air volume required for complete combustion of the fuel gas.

[0037] It should also be noted that this embodiment uses a reasonable setting of the sampling hole 31 and the sampling tube module 40 to accurately sample the mixed gas inside the burner cap 30 cavity. Subsequently, the mixed gas inside the burner cap 30 cavity is analyzed sequentially by the gas analysis module 50 and the data processing module 60 to determine the primary air coefficient α corresponding to the stove. The primary air coefficient α obtained in this embodiment allows for further improvement and development of the stove's internal structure, saving costs, avoiding ineffective design, ensuring complete combustion and high combustion efficiency of fuel gas inside the stove cavity, improving the energy efficiency rating of the gas stove, and providing users with a better cooking experience.

[0038] The technical solution in this embodiment of the invention involves a measuring device that samples the mixed gas inside the burner cavity via a sampling tube module and performs component analysis on the sampled mixed gas via a gas analysis module. This allows for the measurement of the primary air supply to the burner of the stove. Based on the primary air supply and the corresponding gas supply, the primary air coefficient of the stove is determined, resulting in a true measured value of the primary air coefficient. This improves the accuracy and efficiency of the primary air coefficient measurement, effectively guiding the design and development of the burner structure. It ensures complete combustion and high combustion efficiency, improves the energy efficiency rating of the gas stove, and provides users with a better cooking experience. This solution addresses the problem of significant discrepancies between the simulated values ​​obtained from simulation software calculations in existing manufacturing processes and the actual primary air coefficient.

[0039] Optionally, continue to refer to Figures 1-4 The data processing module 60 includes an actual gas quantity determination unit, a theoretical gas quantity determination unit, and a primary air coefficient determination unit. The actual gas quantity determination unit is electrically connected to the gas analysis module 50 and the primary air coefficient determination unit, respectively. The actual gas quantity determination unit is used to determine the volume content of oxygen in the mixed gas and define it as the actual primary air quantity. The theoretical gas quantity determination unit is electrically connected to the gas analysis module 50 and the primary air coefficient determination unit, respectively. The theoretical gas quantity determination unit is used to determine the types and corresponding volume contents of each hydrocarbon in the fuel gas in the mixed gas, and based on the types and corresponding volume contents of each hydrocarbon in the fuel gas, determine the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas and define it as the theoretical primary air quantity. The primary air coefficient determination unit is used to determine the primary air coefficient α corresponding to the stove based on the ratio of the actual primary air quantity to the theoretical primary air quantity.

[0040] First, it should be noted that the primary air coefficient α corresponding to the stove can be the ratio of the actual amount of primary air injected to the theoretical amount of primary air required for complete combustion of the fuel gas. Since fuel gas generally reacts with oxygen for complete combustion, the primary air coefficient α corresponding to the stove can also be the ratio of the actual amount of oxygen injected to the theoretical amount of oxygen required for complete combustion of the fuel gas. In other words, the primary air coefficient α is expressed as the ratio of oxygen volume content. Specifically, the mixed gas inside the cavity of the burner cap 30 contains fuel gas and injected primary air. For example, the fuel gas may include various hydrocarbons (e.g., CH4, C2H6, C3H8, etc.), which can react with oxygen for complete combustion.

[0041] The actual gas quantity determination unit is electrically connected to the gas analysis module 50. This unit can receive the types of gases contained in the mixed gas and their corresponding volume contents. Within the mixed gas, it distinguishes oxygen from the hydrocarbons in the fuel gas, thereby determining the volume content of oxygen. For example, the volume content of oxygen can be... This can also be understood as the actual amount of oxygen injected, or the actual amount of primary air. For example, the oxygen volume content can also be understood as the percentage of oxygen volume in the mixed gas volume.

[0042] The theoretical gas quantity determination unit is electrically connected to the gas analysis module 50. This allows the theoretical gas quantity determination unit to receive the types of gases contained in the mixed gas and their corresponding volume contents. Within the mixed gas, it distinguishes oxygen from the hydrocarbons in the fuel gas, thereby determining the types and corresponding volume contents of each hydrocarbon in the fuel gas. For example, the chemical formula of the corresponding hydrocarbon in the fuel gas can be... Where, x i y represents the number of carbon atoms in the corresponding hydrocarbon in the fuel gas. i This indicates the number of hydrogen atoms in the corresponding hydrocarbon in the fuel gas. The volume content of the corresponding hydrocarbon in the fuel gas can be... For example, the volume content of the corresponding hydrocarbon in the fuel gas can also be understood as the percentage of the volume of the corresponding hydrocarbon in the fuel gas in the volume of the mixed gas. For example, the corresponding hydrocarbon in the fuel gas can be CH4, then x i y is 1 i The volume content of CH4 is 4, which can be 4. Furthermore, the theoretical gas quantity determination unit can also determine the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas, based on the types and corresponding volume contents of each hydrocarbon in the fuel gas. It is understandable that for a given volume of fuel gas to burn completely, the amount of oxygen required is also fixed. For example, the reaction equations for the hydrocarbons and oxygen in the fuel gas are as follows: If the volume content of the corresponding hydrocarbons in the fuel gas is The volume content of oxygen required for the complete combustion of the corresponding hydrocarbons in the fuel gas is: Furthermore, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas can be... This can also be understood as the theoretically required amount of oxygen or the theoretical primary air volume. For example, the corresponding hydrocarbons in the fuel gas can be a combination of CH4 and C3H8, and the volume content of CH4 can be... The volume content of C3H8 can be The volume content of oxygen required for the complete combustion of CH4 can be: That is to say Furthermore, the volumetric oxygen content required for the complete combustion of C2H6 can be... That is, Furthermore, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas can be...

[0043]

[0044] The primary air coefficient determination unit is electrically connected to both the actual gas quantity determination unit and the theoretical gas quantity determination unit. This allows the primary air coefficient determination unit to receive the actual primary air quantity transmitted from the actual gas quantity determination unit and the theoretical primary air quantity transmitted from the theoretical gas quantity determination unit. Then, the primary air coefficient determination unit can determine the primary air coefficient α corresponding to the stove based on the ratio of the actual primary air quantity to the theoretical primary air quantity. For example, this can be calculated using a formula... Determine the primary air coefficient α corresponding to the stove. For example, the hydrocarbons in the fuel gas could be a combination of CH4 and C3H8.

[0045] Optionally, Figure 5 This is a cross-sectional structural diagram of the sampling hole and the outlet area of ​​the flame outlet of a flame cap according to an embodiment of the present invention, as shown in the figure. Figure 5 As shown, the outer wall of the flame cap 30 also includes a plurality of flame outlet holes 32, each of which communicates with the interior of the cavity of the flame cap 30; the outlet area S1 of each sampling hole 31 is the same; the outlet area S2 of each flame outlet hole 32 is the same, and the outlet area S1 of the sampling hole 31 is the same as the outlet area S2 of the flame outlet hole 32; or, the outlet areas S2 of at least two flame outlet holes 32 are not the same, and the outlet area S1 of the sampling hole 31 is the same as the largest of the outlet areas S2 of each flame outlet hole 32.

[0046] Specifically, the outer wall of the burner cap 30 in the stove also includes multiple flame outlet holes 32, each of which communicates with the interior of the burner cap 30 cavity. For example, each flame outlet hole 32 can be understood as a through-hole structure. The number, position, and size of each flame outlet hole 32 can be selected according to actual needs, and this embodiment does not limit this. For example, each flame outlet hole 32 can be arranged in multiple rows and columns. It should also be noted that the flame outlet hole 32 can be understood as a structure formed on the existing outer wall of the burner cap 30, while the sampling hole 31 is an additional feature in this embodiment. Essentially, this embodiment designs the sampling hole 31 based on the outlet area S2 of the flame outlet hole 32 corresponding to the outlet area S1 of the sampling hole 31.

[0047] In one specific embodiment, when the outlet areas S2 of each flame outlet 32 ​​on the outer wall of the burner cap 30 are the same, the outlet area S1 of the sampling hole 31 can be designed to be the same as the outlet area S2 of the flame outlet 32, that is, S1 = S2. This structural arrangement ensures that the gas flow velocity and outlet dynamic pressure of the mixed gas flowing out through each sampling hole 31 are the same as the parameters of the flame outlet 32, resulting in better consistency in smooth distribution. This effectively maintains the stability of combustion during the determination of the primary air coefficient α, thereby ensuring the accuracy and high efficiency of the determination of the primary air coefficient α.

[0048] In another specific embodiment, the outlet areas S2 of at least two flame outlet holes 32 on the outer wall of the burner cap 30 are not the same. That is, when the outlet areas S2 of each flame outlet hole 32 on the outer wall of the burner cap 30 are not completely identical, the outlet area S1 of the sampling hole 31 can be designed to be the same as the largest of the outlet areas S2 of each flame outlet hole 32, i.e., S1 = max{S2}. This structural arrangement ensures that the gas flow velocity and outlet dynamic pressure of the mixed gas flowing out through each sampling hole 31 are the same as the parameters of the flame outlet hole 32, resulting in better consistency in smooth distribution. This effectively maintains the stability of combustion during the determination of the primary air coefficient α, thereby ensuring the accuracy and high efficiency of the determination of the primary air coefficient α.

[0049] Optionally, Figure 6 This is a cross-sectional structural diagram showing the depth of the sampling hole and the flame outlet hole of a flame cap according to an embodiment of the present invention, as shown below. Figure 6 As shown, the outer wall of the flame cap 30 also includes a plurality of flame outlet holes 32, each of which communicates with the interior of the cavity of the flame cap 30; the depth D1 of each sampling hole 31 is the same; the depth D2 of each flame outlet hole 32 is the same, and the depth D1 of the sampling hole 31 is the same as the depth D2 of the flame outlet hole 32; or, at least two flame outlet holes 32 have different depths D2, and the depth D1 of the sampling hole 31 is the same as the largest of the depths D2 of each flame outlet hole 32.

[0050] Specifically, the outer wall of the burner cap 30 in the stove also includes multiple flame outlet holes 32, each of which communicates with the interior of the burner cap 30 cavity. For example, each flame outlet hole 32 can be understood as a through-hole structure. The number, position, and size of each flame outlet hole 32 can be selected according to actual needs, and this embodiment does not limit this. For example, each flame outlet hole 32 can be arranged in multiple rows and columns. It should also be noted that the flame outlet holes 32 can be understood as structures formed on the existing outer wall of the burner cap 30, while the sampling hole 31 is an additional feature in this embodiment, and this embodiment essentially designs the depth D1 of the sampling hole 31 based on the depth D2 of the flame outlet holes 32.

[0051] In one specific embodiment, when the depth D2 of each flame outlet hole 32 on the outer wall of the burner cap 30 is the same, the depth D1 of the sampling hole 31 can be designed to be the same as the depth D2 of the flame outlet hole 32, that is, D1 = D2. This structural arrangement ensures that the gas flow velocity and outlet dynamic pressure of the mixed gas flowing out through each sampling hole 31 are the same as the parameters of the flame outlet hole 32, resulting in better consistency in smooth distribution. This effectively maintains combustion stability during the determination of the primary air coefficient α, thereby ensuring the accuracy and high efficiency of the primary air coefficient α determination.

[0052] In another specific embodiment, the depths D2 of at least two flame outlet holes 32 on the outer wall of the burner cap 30 are not the same. That is, when the depths D2 of each flame outlet hole 32 on the outer wall of the burner cap 30 are not completely identical, the depth D1 of the sampling hole 31 can be designed to be the same as the maximum of the depths D2 of each flame outlet hole 32, i.e., D1 = max{D2}. This structural arrangement ensures that the gas flow velocity and outlet dynamic pressure of the mixed gas flowing out through each sampling hole 31 are the same as the parameters of the flame outlet hole 32, resulting in better uniformity of smooth distribution. This effectively maintains combustion stability during the determination of the primary air coefficient α, thereby ensuring the accuracy and high efficiency of the primary air coefficient α determination.

[0053] Optionally, Figure 7 This is a cross-sectional structural diagram of the sampling hole and the flame outlet hole of a flame cap provided in an embodiment of the present invention, showing the angles between them and the horizontal plane. Figure 7 As shown, the outer wall of the flame cap 30 also includes multiple flame outlet holes 32, each of which communicates with the interior of the flame cap 30 cavity; the angle A1 between the axis of each sampling hole 31 and the horizontal plane is the same; the angle A2 between the axis of each flame outlet hole 32 and the horizontal plane is the same, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is greater than or equal to a first preset angle, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is less than or equal to a second preset angle; wherein, the first preset angle is less than the angle A2 between the axis of the flame outlet hole 32 and the horizontal plane, and the second preset angle is less than or equal to a second preset angle. The angle is greater than the angle A2 between the axis of the flame outlet 32 ​​and the horizontal plane; or, the angle A2 between the axis of at least two flame outlets 32 and the horizontal plane is not the same, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is greater than or equal to a third preset angle, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is less than or equal to a fourth preset angle; wherein, the third preset angle is less than the smallest of the angles A2 between the axis of the flame outlet 32 ​​and the horizontal plane, and the fourth preset angle is greater than the largest of the angles A2 between the axis of the flame outlet 32 ​​and the horizontal plane.

[0054] Specifically, the outer wall of the burner cap 30 in the stove also includes multiple flame outlet holes 32, each of which communicates with the interior of the burner cap 30 cavity. For example, each flame outlet hole 32 can be understood as a through-hole structure. The number, position, and size of each flame outlet hole 32 can be selected according to actual needs, and this embodiment does not limit this. For example, each flame outlet hole 32 can be arranged in multiple rows and columns. It should also be noted that the flame outlet hole 32 can be understood as a structure formed on the existing outer wall of the burner cap 30, while the sampling hole 31 is an additional feature in this embodiment. Essentially, this embodiment designs the sampling hole 31 based on the angle A2 between the axis of the flame outlet hole 32 and the horizontal plane, corresponding to the angle A1 between the axis of the sampling hole 31 and the horizontal plane.

[0055] In one specific embodiment, when the angle A2 between the axis of each flame outlet 32 ​​on the outer wall of the flame cap 30 and the horizontal plane is the same, the angle A1 between the axis of the sampling hole 31 and the horizontal plane can be designed to be greater than or equal to a first preset angle, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is less than or equal to a second preset angle, that is, the first preset angle ≤ A1 ≤ the second preset angle. Wherein, the first preset angle is less than the angle A2 between the axis of the flame outlet 32 ​​and the horizontal plane. For example, the first preset angle can be A2-5°, that is, the difference between the first preset angle and the angle A2 between the axis of the flame outlet 32 ​​and the horizontal plane is 5°. And, the second preset angle is greater than the angle A2 between the axis of the flame outlet 32 ​​and the horizontal plane. For example, the second preset angle can be A2+5°, that is, the difference between the second preset angle and the angle A2 between the axis of the flame outlet 32 ​​and the horizontal plane is 5°. Therefore, we can obtain A2-5°≤A1≤A2+5°. This structural design allows the sampling port 31 and the flame outlet 32 ​​to have roughly the same outlet direction, resulting in better consistency of gas flow. This reduces backflow and avoids the formation of vortices, thereby effectively maintaining the stability of gas flow during the determination of the primary air coefficient α, and thus ensuring the accuracy and high efficiency of the determination of the primary air coefficient α.

[0056] In another specific embodiment, the angle A2 between the axes of at least two flame outlet holes 32 on the outer wall of the flame cap 30 and the horizontal plane is not the same. That is, when the angle A2 between the axes of each flame outlet hole 32 on the outer wall of the flame cap 30 and the horizontal plane is not exactly the same, the angle A1 between the axis of the sampling hole 31 and the horizontal plane can be designed to be greater than or equal to a third preset angle, and the angle A1 between the axis of the sampling hole 31 and the horizontal plane is less than or equal to a fourth preset angle, that is, the third preset angle ≤ A1 ≤ the fourth preset angle. Among them, the third preset angle is less than the smallest of the angles A2 between the axes of the flame outlet holes 32 and the horizontal plane. For example, the third preset angle can be min{A2}-2°, that is, the difference between the third preset angle and the smallest of the angles A2 between the axes of the flame outlet holes 32 and the horizontal plane is 2°. Furthermore, the fourth preset angle is greater than the largest of the angles A2 between the axis of the ignition port 32 and the horizontal plane. For example, the fourth preset angle can be max{A2}+2°, that is, the difference between the fourth preset angle and the largest of the angles A2 between the axis of the ignition port 32 and the horizontal plane is 2°. Therefore, min{A2}-2°≤A1≤max{A2}+2° can be obtained. This structural arrangement ensures that the outlet directions of the sampling port 31 and the ignition port 32 are approximately the same, resulting in better consistency of gas flow. This reduces backflow and avoids the formation of vortices, effectively maintaining the stability of gas flow during the determination of the primary air coefficient α, thereby ensuring the accuracy and high efficiency of the primary air coefficient α determination.

[0057] Optionally, continue to refer to Figures 1-4 The measuring device also includes an annular connecting module 70; one end of the annular connecting module 70 is fixedly connected to the outer wall of the flame cap 30, and the other end of the annular connecting module 70 is detachably connected to one end of the sampling tube module 40. The internal hollow structure of the annular connecting module 70 is connected to each sampling hole 31, and the orthographic projection of each sampling hole 31 on the outer wall of the flame cap 30 is located within the orthographic projection of the annular connecting module 70 on the outer wall of the flame cap 30.

[0058] Specifically, the annular connecting module 70 and the sampling tube module 40 can be detachably connected via a threaded structure, a plug-in structure, or similar means. The hollow internal structure of the annular connecting module 70 communicates with each sampling hole 31, and the orthographic projection of each sampling hole 31 onto the outer wall of the burner cap 30 is located within the orthographic projection of the annular connecting module 70 onto the outer wall of the burner cap 30. That is, the annular connecting module 70 can surround all the sampling holes 31, so that the mixed gas sampled from the sampling holes 31 inside the cavity of the burner cap 30 can all enter the sampling tube module 40, avoiding waste and the risk of gas leakage.

[0059] Optionally, continue to refer to Figures 1-4The measuring device also includes a thermocouple module 80, which is located on the side of the burner head 10 near the burner cap 30. The thermocouple module 80 is used to detect whether the stove is turned on or off.

[0060] Exemplarily, the thermocouple module 80 can generate an electrical signal when a flame is generated at the burner cap 30 or when the temperature is high, that is, when the burner is in use, due to the high temperature of the flame. Specifically, the thermocouple module 80 is also electrically connected to the data processing module 60. The thermocouple module 80 can transmit the electrical signal corresponding to the detected on / off state of the stove to the data processing module 60, so that the data processing module 60 can adjust the start or stop of the primary air coefficient α measurement process according to the received electrical signal corresponding to the on / off state of the stove. Exemplarily, the device for measuring the primary air coefficient α of the stove in this embodiment is applicable when the stove is on, that is, it can measure the primary air volume and calculate the primary air coefficient α during the use of the stove without affecting the normal use of the stove.

[0061] Based on the same inventive concept, this invention also provides a method for determining the primary air coefficient of a stove. Figure 8 This is a schematic flowchart illustrating a method for determining the primary air coefficient of a stove according to an embodiment of the present invention. This method is applied to the primary air coefficient measuring device for stoves provided in any of the embodiments of the present invention. (Continue to refer to...) Figures 1-4 The stove includes a burner cap 30, and the outer wall of the burner cap 30 includes multiple sampling holes 31, each of which communicates with the interior of the burner cap 30 cavity. Figure 8 As shown, the determination method includes:

[0062] S110. Sample the mixed gas inside the flame cap cavity through each sampling hole.

[0063] Specifically, please refer to Figures 1-4One end of the sampling tube module 40 is connected to each sampling hole 31, meaning one end of the sampling tube module 40 can communicate with the interior of the burner cap 30's cavity. The mixed gas connected to the interior of the burner cap 30's cavity can further flow into the sampling tube module 40. The sampling tube module 40 can sample the mixed gas inside the burner cap 30's cavity through each sampling hole 31. For example, the mixed gas inside the burner cap 30's cavity contains fuel gas and ejected primary air. Thus, it can be understood that the sampling tube module 40 can extract a portion of the mixed gas inside the burner cap 30's cavity to the outside of the stove for analysis and measurement of the primary air coefficient α, without affecting the normal use of the stove, maintaining the stability of gas flow and combustion. It can measure the primary air volume and calculate the primary air coefficient α during the use of the stove, which helps improve the accuracy of the measured value of the primary air coefficient α.

[0064] S120. Perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents.

[0065] Specifically, please refer to Figures 1-4 The other end of the sampling tube module 40 is connected to the gas analysis module 50. The sampling tube module 40 can then transmit the sampled mixed gas from the cavity of the burner cap 30 to the gas analysis module 50, allowing the gas analysis module 50 to perform component analysis on the sampled mixed gas and determine the types of gases contained in the mixed gas and their corresponding volume contents. The gas analysis module 50 is a process analysis instrument for measuring gas components. It mainly uses a gas sensor to detect the types of gases present in the sampled mixed gas. The gas sensor is used to detect the composition and corresponding volume contents of gases, enabling rapid, real-time, and high-precision acquisition of the types of gases contained in the mixed gas and their corresponding volume contents. It can be used as a preferred solution and widely applied in the development of stoves. For example, the gas analysis module 50 can be a thermal conductivity gas analyzer, an electrochemical gas analyzer, an infrared absorption analyzer, a gas chromatograph, etc.

[0066] S130. Determine the primary air coefficient of the stove based on the types of gases contained in the mixed gas and their corresponding volume contents.

[0067] Specifically, please refer to Figures 1-4The gas analysis module 50 is also electrically connected to the data processing module 60. The gas analysis module 50 can transmit the types of gases and their corresponding volume contents in the determined mixed gas to the data processing module 60, so that the data processing module 60 can determine the primary air coefficient α corresponding to the stove based on the types of gases and their corresponding volume contents in the mixed gas. The mixed gas inside the burner cap 30 cavity contains fuel gas and ejected primary air. The primary air coefficient α corresponding to the stove is related to the actual amount of ejected primary air (which can also be understood as the amount of primary air supplied) and the amount of primary air required for complete combustion of the fuel gas (a certain volume of fuel gas requires a certain amount of air to burn completely). For example, the primary air coefficient α corresponding to the stove can be the ratio of the actual amount of ejected primary air to the amount of primary air required for complete combustion of the fuel gas.

[0068] It should also be noted that this embodiment uses a reasonable setting of the sampling hole 31 and the sampling tube module 40 to accurately sample the mixed gas inside the burner cap 30 cavity. Subsequently, the mixed gas inside the burner cap 30 cavity is analyzed sequentially by the gas analysis module 50 and the data processing module 60 to determine the primary air coefficient α corresponding to the stove. The primary air coefficient α obtained in this embodiment allows for further improvement and development of the stove's internal structure, saving costs, avoiding ineffective design, ensuring complete combustion and high combustion efficiency of fuel gas inside the stove cavity, improving the energy efficiency rating of the gas stove, and providing users with a better cooking experience.

[0069] The technical solution in this invention first samples the mixed gas inside the burner cavity through various sampling holes. Then, it performs component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume content. Finally, based on the types of gases contained in the mixed gas and their corresponding volume content, it determines the primary air coefficient corresponding to the stove. Using this method, the amount of primary air supplied to the burner of the stove is measured. Based on the amount of primary air supplied and the corresponding amount of gas, the primary air coefficient corresponding to the stove is determined, thus obtaining the actual measured value of the true primary air coefficient. This improves the accuracy and efficiency of the primary air coefficient measurement, effectively guiding the design and development of the burner structure, ensuring complete combustion and high combustion efficiency, improving the energy efficiency rating of the gas stove, providing users with a better cooking experience, and solving the problem that existing manufacturing processes mainly rely on simulation software calculations, resulting in a large deviation between the simulated values ​​and the actual primary air coefficient.

[0070] Optionally, before sampling the mixed gas inside the burner cap cavity through each sampling port, the process also includes: confirming that the stove is turned on and in continuous use.

[0071] Optionally, confirming that the stove is turned on and in continuous use includes: receiving a stove-on signal from the thermocouple module, and after a first preset time threshold, confirming that the stove is turned on and in continuous use.

[0072] Specifically, please refer to Figures 1-4 The thermocouple module 80 can generate an electrical signal when a flame is generated at the burner cap 30 or when the temperature is high, i.e., when the burner is in use, it can be subjected to the high temperature of the flame. The thermocouple module 80 is also electrically connected to the data processing module 60. The thermocouple module 80 can transmit the electrical signal corresponding to the detected on / off state of the stove to the data processing module 60, so that the data processing module 60 can adjust the start or stop of the primary air coefficient α measurement process according to the received electrical signal corresponding to the on / off state of the stove. Exemplarily, the stove primary air coefficient α measuring device in this embodiment can be applied to the case where the stove is on, that is, it can measure the primary air volume and calculate the primary air coefficient α during the use of the stove without affecting the normal use of the stove.

[0073] For example, when the data processing module 60 receives an electrical signal from the thermocouple module 80, it can determine that the stove is turned on and in use. Simultaneously, the data processing module 60 can also start a timer. When the timer is greater than or equal to a first preset time threshold, it can be further determined that the stove is in continuous use, and the primary air coefficient α measurement process can begin. For example, the first preset time threshold can be 180 seconds. This setting allows the primary air coefficient α measurement process to be performed during the continuous use of the stove. If the stove is frequently started and stopped, or briefly ignited and then turned off, the primary air coefficient α measurement process is not performed. This reduces the working time of the primary air coefficient α measuring device, improving the service life of components, and ensuring the accuracy of the primary air coefficient α measurement without affecting the normal use of the stove.

[0074] And, continue to refer to Figures 1-4 In the case of timing by the data processing module 60, the gas analysis module 50 can be turned on or off according to the timing of the data processing module 60, without having to keep the gas analysis module 50 constantly on, further reducing energy consumption and also facilitating high-precision control of the gas analysis module 50. When it is necessary to perform an air coefficient α measurement process, the gas analysis module 50 is turned on so that the subsequent data processing module 60 can perform an air coefficient α calculation process.

[0075] In one specific embodiment, optionally, before performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents, the method further includes: starting timing and acquiring a preset measurement time point; performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents includes: starting component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents when the timing reaches the preset measurement time point.

[0076] Specifically, please refer to Figures 1-4 The data processing module 60 can start timing at the moment when the stove is confirmed to be turned on and in continuous use. The data processing module 60 can store preset measurement time points, which can be user-selected or default initial settings. For example, the preset measurement time point can be 900 seconds. When the timing of the data processing module 60 reaches the preset measurement time point, component analysis of the sampled mixed gas can begin to determine the types of gases contained in the mixed gas and their corresponding volume contents. Then, based on the types of gases contained in the mixed gas and their corresponding volume contents, the primary air coefficient α corresponding to the stove can be determined.

[0077] In another specific embodiment, optionally, before performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents, the method further includes: starting timing and acquiring multiple preset measurement time points; performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents includes: according to the order of each preset measurement time point in the time dimension, when the timing time reaches any preset measurement time point, starting component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents, until the timing time passes the last preset measurement time point.

[0078] Specifically, please refer to Figures 1-4The data processing module 60 can start timing at the moment when the stove is confirmed to be turned on and in continuous use. The data processing module 60 can store multiple preset measurement time points, which can be user-selected or default initial settings. For example, the preset measurement time points can be 600s, 700s, 800s, and 900s. Following the time order of these preset measurement time points, when the timing of the data processing module 60 reaches the first preset measurement time point (for example, 600s), component analysis of the sampled mixed gas can begin to determine the types of gases contained in the mixed gas and their corresponding volume content. Then, based on the types of gases contained in the mixed gas and their corresponding volume content, the primary air coefficient α corresponding to the stove can be determined. Subsequently, when the timing of the data processing module 60 reaches the next preset measurement time point (exemplarily 700s), component analysis of the sampled mixed gas can begin to determine the types of gases contained in the mixed gas and their corresponding volume contents. Then, based on the types of gases contained in the mixed gas and their corresponding volume contents, the primary air coefficient α corresponding to the stove can be determined. Similarly, when the timing of the data processing module 60 reaches the last preset measurement time point (exemplarily 900s), component analysis of the sampled mixed gas can begin to determine the types of gases contained in the mixed gas and their corresponding volume contents. Then, based on the types of gases contained in the mixed gas and their corresponding volume contents, the primary air coefficient α corresponding to the stove can be determined. Thus, at this point, all preset measurement time points correspond to the output of a primary air coefficient α.

[0079] Furthermore, after the timing of the data processing module 60 has passed any preset measurement time point, the data processing module 60 can also detect whether all preset measurement time points correspond to the output of a primary air coefficient α. If so, the current measurement process of the primary air coefficient α is exited. If not, the matching process between the next preset measurement time point and the timing of the data processing module 60 is continued according to the time dimension of each preset measurement time point, and the gas analysis module 50 is started again.

[0080] Figure 9 This is a flowchart illustrating another method for determining the primary air coefficient of a stove according to an embodiment of the present invention. This embodiment is an optimization based on the above embodiment. Optionally, the primary air coefficient of the stove is determined according to the types of gases contained in the mixed gas and their corresponding volume contents, including:

[0081] In the mixed gas, the volume content of oxygen is determined and defined as the actual primary air volume, and the types and corresponding volume contents of each hydrocarbon in the fuel gas are determined.

[0082] Based on the types and corresponding volume contents of each hydrocarbon in the fuel gas, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas is determined and defined as the theoretical primary air volume.

[0083] The primary air coefficient corresponding to the stove is determined based on the ratio of the actual primary air volume to the theoretical primary air volume.

[0084] For details not covered in this embodiment, please refer to the above embodiments. Figure 9 As shown, the determination method includes:

[0085] S210. Sample the mixed gas inside the flame cap cavity through each sampling hole.

[0086] S220. Perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents.

[0087] S230. In the mixed gas, determine the volume content of oxygen and define it as the actual primary air volume, and determine the types and corresponding volume contents of each hydrocarbon in the fuel gas.

[0088] First, it should be noted that the primary air coefficient α for a stove can be considered as the ratio of the actual amount of primary air injected to the theoretical amount of primary air required for complete combustion of the fuel gas. Since fuel gas generally reacts with oxygen for complete combustion, the primary air coefficient α for a stove can also be considered as the ratio of the actual amount of oxygen injected to the theoretical amount of oxygen required for complete combustion of the fuel gas. In other words, the primary air coefficient α is expressed as the ratio of oxygen volume content. For more details, please refer to [link / reference]. Figures 1-4 The mixed gas inside the cavity of the burner cap 30 contains fuel gas and ejected primary air. For example, the fuel gas may include a variety of hydrocarbons (such as CH4, C2H6, C3H8, etc.), which can react with oxygen and burn completely.

[0089] The actual gas quantity determination unit is electrically connected to the gas analysis module 50. This unit can receive the types of gases contained in the mixed gas and their corresponding volume contents. Within the mixed gas, it distinguishes oxygen from the hydrocarbons in the fuel gas, thereby determining the volume content of oxygen. For example, the volume content of oxygen can be... This can also be understood as the actual amount of oxygen injected, or the actual amount of primary air. For example, the oxygen volume content can also be understood as the percentage of oxygen volume in the mixed gas volume.

[0090] The theoretical gas quantity determination unit is electrically connected to the gas analysis module 50. This allows the theoretical gas quantity determination unit to receive the types of gases contained in the mixed gas and their corresponding volume contents. Within the mixed gas, it distinguishes oxygen from the hydrocarbons in the fuel gas, thereby determining the types and corresponding volume contents of each hydrocarbon in the fuel gas. For example, the chemical formula of the corresponding hydrocarbon in the fuel gas can be... Where, x i y represents the number of carbon atoms in the corresponding hydrocarbon in the fuel gas. i This indicates the number of hydrogen atoms in the corresponding hydrocarbon in the fuel gas. The volume content of the corresponding hydrocarbon in the fuel gas can be... For example, the volume content of the corresponding hydrocarbon in the fuel gas can also be understood as the percentage of the volume of the corresponding hydrocarbon in the fuel gas in the volume of the mixed gas. For example, the corresponding hydrocarbon in the fuel gas can be CH4, then x i y is 1 i The volume content of CH4 is 4, which can be 4.

[0091] S240. Based on the types and corresponding volume contents of each hydrocarbon in the fuel gas, determine the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas, and define it as the theoretical primary air volume.

[0092] Specifically, please refer to Figures 1-4 The theoretical gas quantity determination unit can also determine the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas, based on the types and corresponding volume contents of each hydrocarbon in the fuel gas. It is understandable that for a given volume of fuel gas to burn completely, the amount of oxygen required is also fixed. For example, the reaction equations for the hydrocarbons and oxygen in the fuel gas are as follows: If the volume content of the corresponding hydrocarbons in the fuel gas is The volume content of oxygen required for the complete combustion of the corresponding hydrocarbons in the fuel gas is: Furthermore, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas can be... This can also be understood as the theoretically required amount of oxygen or the theoretical primary air volume. For example, the corresponding hydrocarbons in the fuel gas can be a combination of CH4 and C3H8, and the volume content of CH4 can be... The volume content of C3H8 can be The volume content of oxygen required for the complete combustion of CH4 can be: That is to say Furthermore, the volumetric oxygen content required for the complete combustion of C2H6 can be... That is, Furthermore, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas can be...

[0093]

[0094] S250. Determine the primary air coefficient corresponding to the stove based on the ratio of the actual primary air volume to the theoretical primary air volume.

[0095] Optionally, the primary air coefficient corresponding to the stove is determined based on the ratio of the actual primary air volume to the theoretical primary air volume, including: according to the calculation formula. Determine the primary air coefficient α corresponding to the stove; where, This indicates the actual amount of air in a single pass. This represents the theoretical primary air volume. Indicates the chemical formula of the corresponding hydrocarbon in the fuel gas, x i y represents the number of carbon atoms in the corresponding hydrocarbon in the fuel gas. i This indicates the number of hydrogen atoms in the corresponding hydrocarbon in the fuel gas. This indicates the volume content of the corresponding hydrocarbons in the fuel gas.

[0096] Specifically, please refer to Figures 1-4 The primary air coefficient determination unit is electrically connected to both the actual gas quantity determination unit and the theoretical gas quantity determination unit. The primary air coefficient determination unit receives the actual primary air quantity transmitted by the actual gas quantity determination unit and the theoretical primary air quantity transmitted by the theoretical gas quantity determination unit. Then, the primary air coefficient determination unit can determine the primary air coefficient α corresponding to the stove based on the ratio of the actual primary air quantity to the theoretical primary air quantity. For example, this can be calculated using the formula... Determine the primary air coefficient α corresponding to the stove. For example, the hydrocarbons in the fuel gas could be a combination of CH4 and C3H8.

[0097]

[0098] Figure 10 This is a flowchart illustrating another method for determining the primary air coefficient of a stove according to an embodiment of the present invention, as shown below. Figures 1-4 , Figure 10As shown, the stove's on / off operation is user-operable. The thermocouple module 80 generates an electrical signal when a flame is produced at the burner cap 30 / at a high temperature, i.e., when the burner is in use, due to the high temperature of the flame. The thermocouple module 80 is also electrically connected to the data processing module 60, transmitting the detected electrical signal corresponding to the stove's on / off status to the data processing module 60. When the data processing module 60 receives the electrical signal from the thermocouple module 80, it can determine that the stove is on and in use. Simultaneously, the data processing module 60 can start a timer. When the timer exceeds or equals a first preset time threshold, it can further determine that the stove is in continuous use and proceed to the air coefficient α measurement process. Furthermore, it is also necessary to obtain preset measurement time points. When the timing of the data processing module 60 reaches the preset measurement time point, the gas analysis module 50 is activated to begin component analysis of the sampled mixed gas, determining the volume content of oxygen and the volume content of fuel gas. Then, the data processing module 60 can determine the primary air coefficient α corresponding to the stove based on the ratio of the volume content of oxygen to the volume content of oxygen required for complete combustion of fuel gas. In addition, after the timing of the data processing module 60 has passed any preset measurement time point, the data processing module 60 can also check whether all preset measurement time points correspond to the output of a primary air coefficient α. If so, the current primary air coefficient α measurement process is exited, and the gas analysis module 50 is turned off. If not, the matching process between the next preset measurement time point and the timing of the data processing module 60 continues according to the time dimension of each preset measurement time point, and the gas analysis module 50 is activated again.

[0099] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A device for measuring the primary air coefficient of a stove, characterized in that, The stove includes a burner cap (30), and the outer wall of the burner cap (30) includes a plurality of sampling holes (31), each of the sampling holes (31) communicating with the interior of the cavity of the burner cap (30); The measuring device includes a sampling tube module (40), a gas analysis module (50), and a data processing module (60); One end of the sampling tube module (40) is connected to each of the sampling holes (31), and the sampling tube module (40) is used to sample the mixed gas inside the cavity of the flame cap (30) through each of the sampling holes (31); The other end of the sampling tube module (40) is connected to the gas analysis module (50), which is used to perform component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents. The data processing module (60) is electrically connected to the gas analysis module (50). The data processing module (60) is used to determine the primary air coefficient of the stove based on the types of gases contained in the mixed gas and their corresponding volume contents.

2. The measuring device according to claim 1, characterized in that, The outer wall of the flame cap (30) also includes a plurality of flame outlet holes (32), each of which communicates with the interior of the cavity of the flame cap (30); The outlet area of ​​each of the sampling holes (31) is the same; The outlet areas of each of the flame outlet holes (32) are the same, and the outlet area of ​​the sampling hole (31) is the same as the outlet area of ​​the flame outlet hole (32); Alternatively, the outlet areas of at least two of the flame outlets (32) are not the same, and the outlet area of ​​the sampling hole (31) is the same as the largest of the outlet areas of each of the flame outlets (32).

3. The measuring device according to claim 1, characterized in that, The outer wall of the flame cap (30) also includes a plurality of flame outlet holes (32), each of which communicates with the interior of the cavity of the flame cap (30); The depth of each of the sampling holes (31) is the same; The depth of each of the flame outlet holes (32) is the same, and the depth of the sampling hole (31) is the same as the depth of the flame outlet hole (32); Alternatively, at least two of the flame outlets (32) have different depths, and the depth of the sampling hole (31) is the same as the maximum depth of each of the flame outlets (32).

4. The measuring device according to claim 1, characterized in that, The outer wall of the flame cap (30) also includes a plurality of flame outlet holes (32), each of which communicates with the interior of the cavity of the flame cap (30); The angle between the axis of each sampling hole (31) and the horizontal plane is the same; The angle between the axis of each of the flame outlet holes (32) and the horizontal plane is the same, and the angle between the axis of the sampling hole (31) and the horizontal plane is greater than or equal to a first preset angle, and the angle between the axis of the sampling hole (31) and the horizontal plane is less than or equal to a second preset angle; wherein, the first preset angle is less than the angle between the axis of the flame outlet hole (32) and the horizontal plane, and the second preset angle is greater than the angle between the axis of the flame outlet hole (32) and the horizontal plane; Alternatively, the angles between the axes of at least two of the flame outlet holes (32) and the horizontal plane are not the same, and the angle between the axis of the sampling hole (31) and the horizontal plane is greater than or equal to a third preset angle, and the angle between the axis of the sampling hole (31) and the horizontal plane is less than or equal to a fourth preset angle; wherein the third preset angle is less than the smallest of the angles between the axes of the flame outlet holes (32) and the horizontal plane, and the fourth preset angle is greater than the largest of the angles between the axes of the flame outlet holes (32) and the horizontal plane.

5. The measuring device according to claim 1, characterized in that, The measuring device also includes a ring connection module (70); One end of the annular connecting module (70) is fixedly connected to the outer wall of the flame cap (30), and the other end of the annular connecting module (70) is detachably connected to one end of the sampling tube module (40). The hollow internal structure of the annular connecting module (70) is connected to each of the sampling holes (31), and the orthographic projection of each sampling hole (31) on the outer wall of the flame cap (30) is located within the orthographic projection of the annular connecting module (70) on the outer wall of the flame cap (30).

6. A method for determining the primary air coefficient of a stove, characterized in that, The stove includes a burner cap (30), and the outer wall of the burner cap (30) includes a plurality of sampling holes (31), each of the sampling holes (31) communicating with the interior of the cavity of the burner cap (30); The determination method includes: The mixed gas inside the cavity of the flame cap (30) is sampled through each of the sampling holes (31); The sampled mixed gas is subjected to component analysis to determine the types of gases contained in the mixed gas and their corresponding volume contents; The primary air coefficient of the stove is determined based on the types of gases contained in the mixed gas and their corresponding volume contents.

7. The determination method according to claim 6, characterized in that, Based on the types of gases contained in the mixed gas and their corresponding volume contents, the primary air coefficient corresponding to the stove is determined, including: In the mixed gas, the volume content of oxygen is determined and defined as the actual primary air volume, and the types and corresponding volume contents of each hydrocarbon in the fuel gas are determined. Based on the types and corresponding volume contents of each hydrocarbon in the fuel gas, the total volume content of oxygen required for the complete combustion of each hydrocarbon in the fuel gas is determined and defined as the theoretical primary air volume. The primary air coefficient corresponding to the stove is determined based on the ratio of the actual primary air volume to the theoretical primary air volume.

8. The determination method according to claim 6, characterized in that, Before performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents, the method further includes: Start timing and acquire the preset measurement time point; The sampled mixed gas is subjected to component analysis to determine the types of gases contained in the mixed gas and their corresponding volume contents, including: When the preset measurement time point is reached, the sampled mixed gas is subjected to component analysis to determine the types of gases contained in the mixed gas and their corresponding volume contents.

9. The determination method according to claim 6, characterized in that, Before performing component analysis on the sampled mixed gas to determine the types of gases contained in the mixed gas and their corresponding volume contents, the method further includes: Start timing and acquire multiple preset measurement time points; The sampled mixed gas is subjected to component analysis to determine the types of gases contained in the mixed gas and their corresponding volume contents, including: According to the order of the preset measurement time points in the time dimension, when the timing time reaches any of the preset measurement time points, the component analysis of the sampled mixed gas is started to determine the types of gases contained in the mixed gas and their corresponding volume contents, until the timing time passes the last preset measurement time point.

10. The determination method according to claim 6, characterized in that, Before sampling the mixed gas inside the cavity of the flame cap (30) through each of the sampling holes (31), the method further includes: Confirm that the stove is turned on and in continuous use.

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