Updraft gas stove and control method thereof

Abstract

The application provides a top air inlet gas stove and a control method thereof. The top air inlet gas stove comprises a burner, an injection pipe joint, a blowing assembly, a detection assembly and a control processor. The burner has an injection pipe for top air inlet. The injection pipe joint at least partially extends into the injection pipe. The blowing assembly is arranged in the injection pipe and is used for promoting air flow in the injection pipe joint. The control processor receives a signal of the detection assembly, calculates a required residual air flow according to the signal and an air flow required for complete premixing of air and gas, and controls a rotating speed of the blowing assembly according to the residual air flow. In the application, the blowing system and the detection assembly are arranged in the injection pipe. The application can be applied to a pipe platform and a direct insertion platform. The gas stove can monitor gas flow, control the blowing assembly to operate and increase the injection capacity of the burner, so that the gas stove realizes complete premixing combustion.

Description

Technical Field

[0001] This invention belongs to the field of kitchenware technology, and more specifically, relates to a top-intake gas stove and its control method. Background Technology

[0002] The injector tube of a top-intake burner is generally located above the cooktop. The air required for combustion does not need to be supplied from inside the cabinet, eliminating the need for ventilation holes in the cabinet door and ventilation space inside the cabinet. This satisfies users' needs for a clean appearance and high space utilization. However, the injector tube of a top-intake burner is usually shorter, resulting in poor ejection capacity and insufficient air supply, which affects combustion thermal efficiency.

[0003] For flat plate burners, numerous flame holes are distributed in concentric circles on the upper surface of the burner cap. During combustion, due to flame obstruction, it is often difficult for the flame holes in the middle area to replenish secondary air. The burner needs to inject more primary air to ensure complete combustion of the gas. Therefore, for top-intake flat plate burners, the air replenishment capacity of the burner needs to be optimized and improved to ensure combustion performance. Summary of the Invention

[0004] The purpose of this invention is to provide a top-intake gas stove and its control method to solve the technical problem of low combustion thermal efficiency caused by insufficient air in the top-intake burner in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a top-intake gas stove, comprising: The burner head has an ejector tube with top air intake; An ejector connector is separately disposed from the ejector and at least partially extends into the ejector, and at least a portion of the ejector connector has a tapered structure in the airflow direction; A blower assembly is disposed inside the ejector tube and is used to promote airflow within the ejector tube connector; A detection component is disposed inside the ejector tube and is used to detect the mixed flow rate of air and fuel gas at the burner head; The control processor receives the signal from the detection component and calculates the required remaining air flow based on the signal and the air flow required for complete premixing of air and gas, and controls the rotation speed of the blower component based on the remaining air flow.

[0006] Optionally, the ejector connector includes a connector body and a connecting bracket, one end of which is fixedly connected to the connector body and the other end of which is fixedly connected to the blower assembly.

[0007] Optionally, the central axis of the ejector connector and the central axis of the blower assembly coincide.

[0008] Optionally, the ejector connector further includes a connecting lug that is fixedly connected to the furnace head, the connecting lug being connected to the air inlet end of the connector body.

[0009] Optionally, the detection component is fixed to the connecting bracket.

[0010] Optionally, the number of connecting brackets is multiple and they are arranged circumferentially around the connector body. The detection component includes multiple flow rate sensors, and the flow rate sensors are arranged in a one-to-one correspondence with the connecting brackets.

[0011] Optionally, the connecting bracket has a cable channel inside, and the wiring harnesses of the detection component and the blower component are disposed in the cable channel.

[0012] The present invention also provides a control method for an upward-intake gas stove, applied to the above-mentioned upward-intake gas stove, comprising the following steps: The mixed flow rate of air and fuel gas is obtained through a detection component; Calculate the required remaining air flow rate based on the mixing flow rate and the air flow rate required for complete premixing of air and gas; The rotational speed of the blower assembly is calculated based on the remaining airflow.

[0013] Optionally, the step of calculating the required remaining airflow based on the mixing flow rate and the airflow rate required for complete premixing of air and fuel includes: The mixed flow rate is v 1. The mass ejection coefficient of the top-intake gas stove is: u The calculated gas flow rate is The air flow rate is ; The air flow rate required for complete premixing of air and gas is The required remaining airflow is .

[0014] Optionally, the step of calculating the rotational speed of the blower assembly based on the remaining airflow includes: Based on the working parameters of the blower assembly and the ejector coefficient of the ejector tube, the control processor calculates the corresponding fan speed; Calculate the current value corresponding to the blower assembly based on its operating parameters.

[0015] The beneficial effects of the top-intake gas stove and its control method provided by the present invention are as follows: Compared with the prior art, the top-intake gas stove of the present invention includes a burner head, an injector pipe connector, a blower assembly, a detection assembly, and a control processor. The injector pipe connector is set inside the injector pipe of the burner head. The injector pipe connector increases the air injection capacity of the burner by setting a tapered structure. The blower assembly and the detection assembly are both set inside the injector pipe. The detection assembly is used to detect the mixed flow rate of air and gas in the burner head. By detecting the mixed flow rate, the current air flow rate and gas flow rate can be calculated, and then the supplementary air flow rate required for complete combustion can be calculated. By controlling the rotation speed of the blower assembly, the air flow rate introduced through the injector pipe connector can be adjusted in time to make the gas burn as completely as possible and improve the combustion thermal efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a side view of a top-intake gas stove provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a structural diagram of the top-intake gas stove at the injector pipe provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structural components of the ejector tube provided in an embodiment of the present invention; Figure 5 This is a cross-sectional view of the internal structural components of the ejector tube provided in an embodiment of the present invention.

[0018] The following are the labeling elements in the figure: 10-Burnhead; 11-Ejector tube; 20-Ejector tube connector; 21-Connector body; 211-Gradual reduction structure; 22-Connecting bracket; 23-Connecting ear; 231-Connecting hole; 30-Blower assembly; 40-Detection assembly; 50-Cooktop panel. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] As described in the background section, top-intake burners typically have their injector tubes positioned above the cooktop panel, allowing the primary air required for combustion to be drawn directly from above the cooktop without needing to be supplied from inside the cabinet. However, due to the limited installation space above the cooktop, the injector tubes of top-intake burners are generally shorter, resulting in weaker injection capacity. This leads to insufficient primary air injection and incomplete mixing of gas and air, thus affecting combustion thermal efficiency.

[0024] For flat-plate burners, the upper surface of the burner cap typically has numerous concentric circular flame holes. During combustion, the outer flames obstruct the secondary air supply to the central area, making it difficult for the flame holes in the middle area to receive sufficient secondary air. To maintain complete combustion, this type of burner requires a higher primary air injection rate. Therefore, existing top-inlet flat-plate burners, due to insufficient injection capacity of the ejector tubes, struggle to provide enough primary air to the flame holes, making air supply issues particularly prominent and compromising combustion performance. It is necessary to optimize and improve their air supply capabilities.

[0025] To alleviate or solve the above technical problems, this invention proposes a top-intake gas stove, in which the blower system and detection component 40 are both placed inside the injector tube 11 of the burner head 10. This breaks the limitation of traditional blower gas stoves that rely on branch gas pipes to connect gas paths, and can be applied not only to pipe-mounted platforms but also to direct-insertion platforms. Compared with the traditional blower system that monitors the gas flow inside the gas pipe, the blower system and detection component 40 of this invention are located inside the injector tube 11, which can accurately monitor the amount of air and gas that actually enters the burner for mixing. The gas stove of this invention can actively monitor the gas flow and increase the injection capacity of the burner head 10 by controlling the operation of the blower component 30 to draw in more primary air, thereby achieving complete premixed combustion of the gas stove.

[0026] The top-intake gas stove provided in the embodiments of the present invention will now be described.

[0027] Please refer to the following: Figures 1 to 4 Top-mounted gas stoves include: The burner head 10 has an ejector tube 11 with an upward air intake; The ejector connector 20 is separately provided from the ejector tube 11 and at least partially extends into the ejector tube 11, and at least part of the ejector connector 20 is a tapered structure 211 in the airflow direction. The blower assembly 30 is disposed inside the ejector tube 11 and is used to promote airflow within the ejector tube connector 20; The detection component 40 is disposed inside the ejector tube 11 and is used to detect the mixed flow rate of air and fuel gas in the burner head 10; The control processor receives the signal from the detection component 40 and calculates the required remaining air flow based on the signal and the air flow required for complete premixing of air and gas, and controls the rotation speed of the blower component 30 based on the remaining air flow.

[0028] The burner head 10 is the core component of the gas stove. Its main function is to mix gas and air in a specific ratio and burn them stably and efficiently to generate heat. In a top-intake gas stove, the burner head 10 has an top-intake injector pipe 11. The air inlet (air intake end) of this injector pipe 11 is located above the cooktop panel 50 (hence the name "top-intake"). The primary air required for combustion does not need to be obtained from inside the cabinet, thus maintaining the integrity and aesthetics of the cabinet. The burner head 10 is equipped with a gas nozzle that injects gas into the injector pipe 11, using the entraining effect of the gas jet to draw external air into the injector pipe 11.

[0029] The ejector connector 20 is at least partially disposed inside the ejector connector 20, having an air inlet end and an air outlet end, with the air inlet end facing outwards and the air outlet end potentially located inside the ejector tube 11. In the airflow direction, at least a portion of the ejector connector 20 is a tapered structure 211, meaning its internal flow channel cross-sectional area gradually decreases along the airflow direction. This tapered structure 211 can create an acceleration effect on the incoming air, increasing the airflow velocity and thus enhancing the ejection and mixing capacity of the combustion gas. Compared to a conventional straight pipe inlet section, the tapered structure 211 effectively increases the airflow velocity at the ejector connector 20's air outlet end, obtaining a larger volume of primary air under the same combustion gas jet conditions, thus improving ejection efficiency. Simultaneously, the tapered structure 211 makes the airflow more orderly, reducing eddy current losses. The ejector connector 20 and ejector tube 11 are set separately, which makes it easier to integrate the blower assembly 30 and the detection assembly 40 into the ejector connector 20 to form a modular assembly. When air needs to be replenished, the modular assembly can be directly installed into the ejector tube to replenish the ejected air from the top. Installation and maintenance are convenient and quick.

[0030] A blower assembly 30 is disposed within the ejector tube 11 and located in the airflow path of the ejector tube connector 20, used to promote airflow within the ejector tube connector 20. The blower assembly 30 can be a miniature axial flow fan or a centrifugal fan, driven by a motor. When the blower assembly 30 is operating, it can actively generate forced airflow within the ejector tube connector 20 to supplement the air volume lacking due to insufficient natural ejection capacity. In scenarios where top-intake flat plate burners require more primary air, the blower assembly 30 can provide flexible air replenishment capabilities.

[0031] A detection component 40 is disposed within the injector tube 11 and is used to detect the mixed flow rate of air and fuel gas from the burner head 10. The detection component 40 can be a velocity sensor, flow sensor, hot-wire anemometer, or a differential pressure sensing element, capable of directly or indirectly obtaining the mixed flow rate of fuel gas and air ejected from the gas nozzle. The signal output by the detection component 40 is transmitted to the control processor. For example, if the detection component 40 detects the gas velocity and the cross-sectional area at the location of the detection component 40 is known, the mixed flow rate of air and fuel gas flowing through this location can be calculated.

[0032] The control processor receives signals from the detection component 40, calculates the required residual air flow rate based on these signals and the air flow rate needed for complete premixing of air and fuel gas, and controls the rotation speed of the blower assembly 30 accordingly. The control processor pre-stores the theoretical air-fuel ratio for complete premixed combustion (e.g., 1 mol of methane requires 2 mol of oxygen to burn, and oxygen accounts for approximately 20.9% of the air volume, meaning approximately 9.57 mol of air is needed for the complete combustion of 1 mol of methane). Based on the measured mixing flow rate from the detection component 40, the theoretically required total air volume is calculated. Subtracting the air volume that can be naturally introduced by the fuel gas jet (this portion can be calibrated through measurement or the burner's mass ejection coefficient), the residual air flow rate that needs to be forcibly supplemented by the blower assembly 30 is obtained. The control processor adjusts the rotation speed of the blower assembly 30 accordingly, ensuring that the actual supplemented air volume equals the required residual air volume. This ensures that the premixed gas entering the burner head 10 is always close to the complete premixing ratio, thereby significantly improving combustion efficiency, reducing harmful emissions, and adapting to the real-time air volume requirements of different fire levels.

[0033] Traditional blower gas stoves require the use of branch gas pipes to connect the gas path, which is only suitable for pipe-mounted platforms. In this invention, the blower assembly 30 and the detection assembly 40 are both placed inside the injector tube 11 of the burner head 10, breaking the limitation of traditional blower gas stoves that rely on branch gas pipes to connect the gas path. This invention is suitable for both pipe-mounted platforms and direct-insertion platforms.

[0034] The top-intake gas stove in the above embodiment includes a burner head 10, an ejector pipe connector 20, a blower assembly 30, a detection assembly 40, and a control processor. The ejector pipe connector 20 is located inside the ejector pipe 11 of the burner head 10. The ejector pipe connector 20 increases the air ejection capacity of the burner by setting a tapered structure. The blower assembly 30 and the detection assembly 40 are both located inside the ejector pipe 11. The detection assembly 40 is used to detect the mixed flow rate of air and gas in the burner head 10. By detecting the mixed flow rate, the current air flow rate and gas flow rate can be calculated, and then the supplementary air flow rate required for complete combustion can be calculated. By controlling the rotation speed of the blower assembly 30, the air flow rate introduced through the ejector pipe connector 20 can be adjusted in time to make the gas burn as completely as possible and improve the combustion thermal efficiency.

[0035] In some embodiments of the present invention, please refer to Figure 4 and Figure 5The ejector connector 20 includes a connector body 21 and a connecting bracket 22. One end of the connecting bracket 22 is fixedly connected to the connector body 21, and the other end of the connecting bracket 22 is fixedly connected to the blower assembly 30. The connector body 21 has the aforementioned tapered structure. The function of the connecting bracket 22 is to connect the connector body 21 and the blower assembly 30, so that the blower assembly 30 is integrated into the ejector connector 20 and is not restricted by other gas paths, directly guiding outside air to the gas and air mixing area of ​​the burner head 10.

[0036] By setting the connecting bracket 22, the blower assembly 30 is stably supported in the central area or downstream of the connector body 21. In this way, the blower assembly 30 and the ejector connector 20 form a pre-assembled module, which facilitates the overall installation into the ejector 11 and ensures the coaxiality of the two. At the same time, the bracket structure has minimal obstruction to the airflow and will not significantly affect the flow field.

[0037] In some embodiments, the connecting bracket 22 may be a radially extending rib, an obliquely extending rib, or an integral retainer, and the specific structure of the connecting bracket 22 is not limited here.

[0038] In some embodiments, the connecting bracket 22 is connected to the outer wall of the connector body 21 so as not to affect the airflow inside the ejector tube 11.

[0039] In some embodiments, the cross-section of the connector body 21 is circular, which can reduce the dead zone of airflow and enhance the airflow ejection capability when air flows inside the ejector connector 20.

[0040] Optionally, the connector body 21 includes a conical section, the bottom end (the end with the larger diameter) of which is closer to the air inlet end of the ejector tube 11, and this conical section is a tapered structure.

[0041] In some embodiments, the connector body 21 of the ejector connector 20 is a venturi tube, which can further enhance the ejection capability of the ejector connector 20 and allow more air to be introduced under the same conditions.

[0042] In some embodiments of the present invention, please refer to Figure 4 and Figure 5 The central axis of the ejector connector 20 and the central axis of the blower assembly 30 coincide. This coaxial arrangement ensures that the airflow generated by the blower assembly 30 acts evenly across the entire flow channel cross-section of the ejector connector 20, avoiding increased local resistance and uneven mixing caused by eccentric flow. Simultaneously, the coaxiality reduces the difference in clearance between the fan blade tip and the flow channel wall, which helps improve air supply efficiency and reduce noise.

[0043] When the cross-section of the ejector connector 20 is circular, its central axis is the axis of the circle. When the blower assembly 30 is a fan, the central axis of the blower assembly 30 is the rotation axis of the fan blades.

[0044] In other embodiments, the central axis of the ejector connector 20 and the central axis of the blower assembly 30 are spaced apart from each other, allowing for a more flexible layout of the blower assembly 30.

[0045] In some embodiments of the present invention, please refer to Figure 3 and Figure 4 The ejector connector 20 also includes a connecting lug 23 that is fixedly connected to the furnace head 10. The connecting lug 23 is connected to the air inlet end of the connector body 21. The connecting lug 23 is connected to the connector body 21 and is part of the structure of the ejector connector 20.

[0046] The connecting lug 23 is used to reliably fix the entire ejector connector 20 module to the inlet of the ejector tube 11 of the furnace head 10. This structure facilitates installation, disassembly, and maintenance, and ensures the positional stability of the ejector connector 20 during long-term operation, preventing positional displacement caused by vibration.

[0047] In some embodiments, the connecting ear 23 may be symmetrically arranged on the air inlet edge of the connector body 21.

[0048] In some embodiments, the connecting ear 23 and the connector body 21 are integrally formed, for example, by die casting or injection molding of aluminum alloy or high-temperature resistant engineering plastic. This integral forming eliminates the assembly gap between the connecting ear 23 and the body, improving structural rigidity and positioning accuracy, and enabling it to withstand the micro-vibrations generated by the operation of the blower assembly 30 for extended periods without loosening.

[0049] In some embodiments, the connecting ear 23 is an independent component, which is fastened to the outer periphery of the air inlet end of the connector body 21 by welding, riveting, or bolting. This split design facilitates the replacement of the matching connecting ear 23 according to different burner head 10 models, improving versatility.

[0050] In some embodiments, both the connecting ear 23 and the burner head 10 are provided with connecting holes 231, and the connecting ear 23 and the burner head 10 are fixedly connected by screws.

[0051] Optionally, the connecting hole 231 on the connecting ear 23 can be a waist-shaped hole or a long slot, so that the ejector tube connector 20 has a certain radial and angular adjustment margin during installation, in order to compensate for the machining tolerance at the inlet of the ejector tube 11 of the furnace head 10 and ensure the coaxiality between the ejector tube connector 20 and the ejector tube 11.

[0052] The fixing method between the connecting ear 23 and the burner head 10 is not limited to screw connection. Preferably, the connecting ear 23 can be provided with an elastic snap-fit ​​structure, and a slot or hole is provided at the corresponding position of the inlet of the injector tube 11 of the burner head 10. During installation, simply push the injector tube connector 20 into the injector tube 11, and the snap-fit ​​will automatically engage, achieving tool-free quick installation. During disassembly, the snap-fit ​​can be removed by pressing the snap-fit, greatly facilitating after-sales maintenance and cleaning. To prevent the snap-fit ​​from loosening due to material expansion differences under heat, the snap-fit ​​can be locked with a wave spring washer or an auxiliary screw.

[0053] To improve vibration and noise reduction performance, a heat-resistant rubber damping washer or a metal wire mesh damping pad can be installed between the contact surface of the connecting ear 23 and the burner head 10. This damping pad absorbs high-frequency vibrations caused by the blower assembly 30 and airflow pulsation, blocking the transmission path of vibration to the cooktop panel 50, thereby reducing overall noise and improving the user experience.

[0054] In some embodiments of the present invention, please refer to Figure 4 and Figure 5 The detection component 40 is fixed to the connecting bracket 22. Integrating the detection component 40 onto the connecting bracket 22 makes full use of the structural space of the connecting bracket 22, eliminating the need for additional fixing seats, resulting in a more compact structure. Furthermore, the detection component 40 can be positioned precisely in the mainstream airflow region to acquire representative flow velocity signals. For example, the detection component 40 can be installed on the windward or leeward side of one of the brackets, and a correction coefficient can be calibrated based on the flow field distribution.

[0055] In some embodiments, the connecting bracket 22 is pre-formed with one or more mounting grooves, the shape of which complements the outline of the detection component 40. The detection component 40 is embedded in the mounting groove, and is flush with or slightly protruding from the surface of the connecting bracket 22. Flush mounting minimizes interference of the detection component 40 with the airflow, improving measurement accuracy. The back of the detection component 40 is bonded to the bottom of the mounting groove with thermally conductive adhesive, allowing the heat generated by the sensor to be dissipated through the bracket and the flowing air, maintaining the detection component 40 within a suitable temperature range.

[0056] The detection component 40 can not only directly measure the gas flow rate, but its functionality can also be expanded. For example, a temperature sensor and a pressure sensor can be integrated on the same connecting bracket 22 to form a composite sensor module. The temperature sensor monitors the premixed gas temperature inside the ejector tube 11 in real time, and the pressure sensor obtains the static pressure inside the ejector tube 11. These auxiliary parameters can be sent to the control processor to correct the air density and flow coefficient, thereby calculating the remaining air flow more accurately. This composite sensor module is also fixed to the connecting bracket 22, and its wiring harness is included in the cable channel.

[0057] The detection component 40 can be fixed to the connecting bracket 22 using a detachable structure, such as by clips or screws, allowing the detection component 40 to be replaced individually. If the detection component 40 drifts or is damaged, the user or after-sales personnel can replace the sensor without disassembling the entire ejector connector 20, reducing maintenance costs.

[0058] To reduce the disturbance of airflow by the detection component 40, the connecting bracket 22 can be designed with an airfoil cross section, with the detection component 40 embedded in the maximum thickness of the airfoil. This airfoil bracket can guide the airflow while also playing a certain role in airflow guidance, reducing the wind resistance loss of the connecting bracket 22 itself.

[0059] In some embodiments of the present invention, please refer to Figure 4 and Figure 5 Multiple connecting brackets 22 are arranged circumferentially around the connector body 21. The detection component 40 includes multiple flow velocity sensors, each corresponding to a connecting bracket 22. By circumferentially arranging multiple flow velocity sensors, the flow velocity distribution across the flow channel cross-section can be comprehensively captured, reducing measurement errors caused by flow anomalies at a single point. The control processor can perform redundant judgment or averaging processing on the signals from each flow velocity sensor, improving measurement reliability and control accuracy. Even if a flow velocity sensor fails, the system can still maintain basic operation based on other sensors, demonstrating fault tolerance.

[0060] In some embodiments, the number of connecting brackets 22 is three or four, evenly distributed circumferentially. For an ejector connector 20 with a circular cross-section, three connecting brackets 22 are arranged at 120° intervals, and four brackets are arranged at 90° intervals. The uniform distribution of the connecting brackets 22 can provide all-round support for the blower assembly 30, ensuring the stability of its central axis, while allowing the flow velocity sensor to cover the main fan-shaped area of ​​the entire cross-section. After receiving the signals from each sensor, the control processor can calculate the average flow velocity of the cross-section based on the flow velocity distribution characteristics at each point using area weighting or fitting algorithms, greatly improving the accuracy of gas flow velocity detection, thereby making the calculation of residual air flow more reliable.

[0061] To further improve measurement redundancy and fault tolerance, multiple flow velocity sensors can be combined using different types or ranges. For example, some sensors may use hot-wire anemometers, which have high sensitivity and are suitable for accurate measurement in low-velocity ranges; others may use Pitot tube differential pressure sensors, which are suitable for high-velocity ranges and are less susceptible to contamination. The control processor selects and activates the corresponding sensor group based on the current power level or flow velocity range, or fuses multiple sets of data to achieve wide-range, high-reliability flow velocity detection.

[0062] The number of connecting brackets 22 and detection components 40 can also be matched with the structure of the blower assembly 30. When the blower assembly 30 uses a fan with a central hub and an external shroud, the flow velocity sensors can be arranged on the connecting brackets 22 corresponding to the hub area and the outer annular area, respectively, to measure the flow velocity in the central low-speed zone and the annular high-speed zone, thereby obtaining a more detailed flow velocity distribution and providing a basis for optimizing the control strategy.

[0063] In some embodiments of the present invention, please refer to Figure 4 The connecting bracket 22 has a cable channel inside, within which the wiring harnesses of the detection component 40 and the blower component 30 are housed. The cable channel can be a pre-set hole or surface groove within the connecting bracket 22. The wiring harness passes through the interior of the bracket and exits from the side wall of the ejector connector 20 to the external control processor. In this way, all electrical connections are concealed and not exposed to airflow, reducing damage to the aerodynamic shape and preventing fatigue damage to the cables caused by airflow fluctuations, thus improving the system's durability and electromagnetic compatibility.

[0064] In some embodiments, the cable channel can be formed in several ways. One way is that the connecting bracket 22 adopts a hollow tubular structure with an inner cavity cross-section that is circular, rectangular, or elliptical. The bracket wall thickness and channel cross-sectional area are determined according to strength and wiring space requirements. The hollow bracket can be obtained by extrusion or casting of metal profiles, or by injection molding of engineering plastics. Another way is to have grooves formed on the outer surface of the bracket, and the opening of the grooves is sealed by a removable cover plate or heat shrink tubing to form a closed channel. This structure facilitates cable threading and subsequent addition, removal, or replacement of cable harnesses.

[0065] In embodiments employing multiple connecting brackets 22, the cable channels within each bracket can be interconnected within the wall of the connector body 21 and converge into a common cable management cavity. The cable management cavity can be located on the side of the connector body 21 or near the air inlet connecting ear 23, and contains terminal blocks or a small control circuit board. All sensor signal lines and the power supply lines for the blower assembly 30 converge here, and are then led out through a multi-core shielded cable from a sealed through-hole on the side wall of the ejector connector 20 to an external control processor. A high-temperature resistant silicone sealant is used at the through-hole to ensure the airtightness of the ejector tube 11, preventing external air from leaking directly into the hole without passing through the tapered structure 211, thus compromising ejection performance.

[0066] To further improve reliability, thermally conductive insulating potting compound can be filled into the cable channel to completely fix and seal the cable harness. The potting compound not only prevents frictional damage to the cable caused by vibration but also enhances the damping characteristics of the bracket. Furthermore, it conducts heat generated by the flow sensor's drive circuit or motor drive module through the bracket to the air within the flow channel, achieving active heat dissipation. For the brushless motor drive board of the blower assembly 30, it can be miniaturized and directly placed within the hub cavity or a channel of a bracket, thereby reducing external wiring and making the entire ejector connector 20 a highly integrated electromechanical module.

[0067] The present invention also provides a control method for an upward-intake gas stove, applicable to the upward-intake gas stove in any of the above embodiments. The control method for the upward-intake gas stove includes the following steps: S10: Obtain the mixed flow rate of air and fuel gas through the detection component 40; S20: Calculate the required residual airflow based on the mixing flow rate and the airflow rate required for complete premixing of air and fuel; S30: Calculate the rotational speed of the blower assembly 30 based on the remaining airflow.

[0068] Step S10: The mixed flow rate of air and fuel gas is obtained through the detection component 40. The detection component 40 can directly output a flow velocity signal or calculate the mass flow rate or volumetric flow rate of the fuel gas. For example, the flow velocity is measured near the nozzle using a hot-wire anemometer, and then the mixed flow rate is calculated by combining the flow area.

[0069] Step S20: Calculate the required residual airflow rate based on the mixing flow rate and the airflow rate required for complete premixing of air and fuel. The airflow rate required for complete premixing is a determined value (known condition) based on the fuel flow rate and the stoichiometric air-fuel ratio. The residual airflow rate is equal to this stoichiometric airflow rate minus the airflow rate naturally introduced by the ejector.

[0070] In step S30, the rotational speed of the blower assembly 30 is calculated based on the remaining airflow. The control processor converts the required airflow into a rotational speed command based on the characteristic curve of the blower assembly 30 or a preset function, and drives the blower assembly 30 to work to supplement the insufficient air volume.

[0071] The advantage of this method is that it tracks the changes in gas flow rate in real time and dynamically adjusts the amount of gas supplied by the blower, ensuring that the mixture ratio is close to the chemical stoichiometry under various fire levels, thereby achieving efficient and clean combustion. Moreover, it has a fast response and can adapt to the transient process of fire adjustment.

[0072] The control method for the top-intake gas stove provided by this invention adopts the aforementioned top-intake gas stove, which includes a burner head 10, an injector pipe connector 20, a blower assembly 30, a detection assembly 40, and a control processor. The injector pipe connector 20 is located inside the injector pipe 11 of the burner head 10. The injector pipe connector 20 increases the air injection capacity of the burner by setting a tapered structure. The blower assembly 30 and the detection assembly 40 are both located inside the injector pipe 11. The detection assembly 40 is used to detect the mixed flow rate of air and gas in the burner head 10. By detecting the mixed flow rate, the current air flow rate and gas flow rate can be calculated, and then the supplementary air flow rate required for complete combustion can be calculated. By controlling the rotation speed of the blower assembly 30, the air flow rate introduced through the injector pipe connector 20 is adjusted in a timely manner to make the gas burn as completely as possible and improve the combustion thermal efficiency.

[0073] In some embodiments of the present invention, the step of calculating the required residual air flow rate based on the gas flow rate and the air flow rate required for complete premixing of air and gas includes: Mixed flow rate v 1. The mass ejection coefficient of the top-intake gas stove is u The calculated gas flow rate is The air flow rate is ; The air flow rate required for complete premixing of air and gas is The required remaining airflow is .

[0074] Among them, mixed flow v 1. The mixed flow rate can be detected by the detection component 40, which includes multiple flow rate sensors. v 1 can be the product of the average value from multiple flow rate sensors and the cross-sectional area. The mass ejection coefficient of the top-intake gas stove is... u Given a known value, when the structure of the ejector tube 11 of the furnace head 10 is determined, the mass ejection coefficient is... u The mass entrainment coefficient is a known value. u This is the ratio of the flow rate of the ejected fluid (air) to the flow rate of the working fluid (fuel gas). Since the combustion of 1 mol of methane requires 2 mol of oxygen, and oxygen constitutes approximately 20.9% of the volume of air, the complete combustion of 1 mol of methane requires approximately 9.57 mol of air. Therefore, when the flow rate of the fuel gas is... At that time, the air required for the complete combustion of these fuel gases is The airflow naturally introduced by the ejection is The required remaining airflow is .

[0075] In some embodiments of the present invention, the step of calculating the rotational speed of the blower assembly 30 based on the remaining airflow includes: Based on the operating parameters of the blower assembly 30 and the ejector coefficient of the ejector tube 11, the control processor calculates the corresponding fan speed. Calculate the current value corresponding to the blower assembly 30 based on its operating parameters.

[0076] The control processor stores the operating parameters of the blower assembly 30, including the flow-speed characteristic curve (or table) and the additional ejection characteristics of the ejector tube 11 under the action of the blower. Combining these parameters, the control processor calculates the corresponding fan speed n based on the required remaining airflow. For example, the output flow rate of the blower assembly 30 is approximately linearly related to the speed n. Considering the load effect of the blower assembly 30 within a specific flow channel of the ejector tube 11, the actual effective replenishment airflow can be calibrated.

[0077] Based on the operating parameters of the blower assembly 30, such as the motor's torque constant and back electromotive force coefficient, the current value I required to maintain the specified speed is calculated. The processor then controls the blower assembly 30 to maintain the target speed via a current loop or voltage PWM adjustment, ensuring accurate air supply. This current calculation step can also be used to monitor the fan's operating status in real time. If the actual current deviates significantly from the predicted value, it indicates an abnormality in the blower assembly 30 or the flow channel, triggering a protection mechanism.

[0078] In some embodiments, when multiple flow velocity sensors are used, step S10 first performs validity verification and filtering on the signals from the multiple flow velocity sensors to obtain a fused value representing the flow velocity, and then proceeds to the calculation stage. If a flow velocity sensor is detected to have an excessive deviation, it can be removed and a maintenance prompt can be issued.

[0079] In some embodiments, the control processor employs a PID control strategy, using the residual airflow deviation as the error input, and outputs a 30-degree rotational speed increment for the blower assembly to achieve continuous and smooth adjustment. A feedforward circuit can also be added, which predicts the required rotational speed based on the rate of change of the gas flow rate, improving transient response.

[0080] In some embodiments, when the gas flow rate signal obtained by the detection component 40 suddenly drops to zero while the blower component 30 is still working, the control processor determines that there has been an accidental flameout, immediately cuts off the gas valve and stops blowing, or switches to scavenging mode.

[0081] In summary, this invention significantly improves the primary air supply capacity of an upward-intake gas stove through the coordinated operation of the tapered ejector connector 20, the speed-controllable blower assembly 30, and the feedback control method. This ensures that the central burner hole of the flat plate burner also receives sufficient premixed air, greatly improving combustion efficiency while maintaining a clean, open-cabinet appearance. The device structure and control method can be flexibly modified and expanded according to actual needs, exhibiting excellent industrial adaptability.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A top-intake gas stove, characterized in that, include: The burner head has an ejector tube with top air intake; An ejector connector is separately disposed from the ejector and at least partially extends into the ejector, and at least a portion of the ejector connector has a tapered structure in the airflow direction; A blower assembly is disposed inside the ejector tube and is used to promote airflow within the ejector tube connector; A detection component is disposed inside the ejector tube and is used to detect the mixed flow rate of air and fuel gas at the burner head; The control processor receives the signal from the detection component and calculates the required remaining air flow based on the signal and the air flow required for complete premixing of air and gas, and controls the rotation speed of the blower component based on the remaining air flow. Wherein, the mixed flow rate detected by the detection component is v 1. The mass ejection coefficient of the top-intake gas stove is: u The calculated gas flow rate is The air flow rate is ; The air flow rate required for complete premixing of air and gas is The required remaining airflow is ; The ejector connector includes a connector body and a connecting bracket. The connector body has the tapered structure. One end of the connecting bracket is fixedly connected to the connector body, and the other end of the connecting bracket is fixedly connected to the blower assembly. The detection assembly is fixed to the connecting bracket.

2. The top-intake gas stove as described in claim 1, characterized in that, The central axis of the ejector connector and the central axis of the blower assembly coincide with each other.

3. The top-intake gas stove as described in claim 1, characterized in that, The ejector tube connector also includes a connecting lug that is fixedly connected to the furnace head, and the connecting lug is connected to the air inlet end of the connector body.

4. The top-intake gas stove as described in claim 1, characterized in that, The number of connecting brackets is multiple and they are arranged circumferentially around the connector body. The detection component includes multiple flow rate sensors, and each flow rate sensor is arranged in a one-to-one correspondence with a connecting bracket.

5. The top-intake gas stove as described in claim 1, characterized in that, The connecting bracket has a cable channel inside, and the wiring harnesses of the detection component and the blower component are disposed in the cable channel.

6. A control method for a top-intake gas stove, applied to the top-intake gas stove according to any one of claims 1-5, characterized in that, Includes the following steps: The mixed flow rate of air and fuel gas is obtained through a detection component; Calculate the required remaining air flow rate based on the mixing flow rate and the air flow rate required for complete premixing of air and gas; The rotational speed of the blower assembly is calculated based on the remaining airflow.

7. The control method for a top-intake gas stove as described in claim 6, characterized in that, The step of calculating the rotational speed of the blower assembly based on the remaining airflow includes: Based on the working parameters of the blower assembly and the ejector coefficient of the ejector tube, the control processor calculates the corresponding fan speed; Calculate the current value corresponding to the blower assembly based on its operating parameters.

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