Efficient premixing air volume self-adaptive commercial gas stove

Abstract

The invention belongs to the technical field of gas stoves, and discloses an efficient premixing air volume self-adaption commercial gas stove which comprises a cooking bench body, a gas system and an intelligent control system. The cooking bench body comprises a cooking bench head, a support, a cooking range and a furnace end. The fuel gas system comprises a turbocharging fan, a premixing pipe, a fuel gas one-way valve, a main fuel gas pipeline and a normal open fire fuel gas pipeline; the turbocharging fan comprises an air inlet, a fuel gas inlet, a fuel gas-air outlet and a volute, and air and fuel gas enter the fan from the inlets of the air and the fuel gas and are mixed in the volute for the first time under the action of blades of the air and the fuel gas. The premixing pipe is connected with a fan outlet and comprises a gradually-shrinking section, a sudden-expanding section and a wing-shaped fin set. The intelligent control system comprises a control electric plate and a double-flameout electromagnetic protection valve, PID closed-loop control is adopted in the system, and the opening degree of a gas valve is dynamically adjusted by monitoring the rotating speed and the air flow of the turbocharging fan in real time, so that the gas flow and the air flow are strictly matched with the preset equivalence ratio.

Description

Technical Field

[0001] This invention belongs to the field of gas stove technology, and in particular relates to a high-efficiency premixed air volume adaptive commercial gas stove. Background Technology

[0002] Commercial gas stoves are core equipment in the catering industry, hotel kitchens, and large canteens. Their combustion efficiency, heat load stability, and energy consumption directly affect operating costs and environmental performance. Traditional commercial gas stoves mostly use atmospheric combustion technology, relying on gas pressure and natural draft to mix air. This results in insufficient primary air mixing and incomplete combustion, leading to low thermal efficiency, high CO emissions, and limited load adjustment capabilities, making it difficult to adapt to the frequent firepower switching demands in commercial settings. Currently, the mainstream technology on the market is forced premixed combustion: gas and air are forcibly premixed by a fan, meaning that the gas and air are premixed once before combustion through a gas nozzle. While this design improves combustion efficiency to some extent, it still has the following problems:

[0003] 1. Lagging airflow regulation: Fixed-speed fans or simple controls cannot respond quickly to changes in gas flow, resulting in an imbalance in the air-fuel ratio, which can easily lead to flameout or backfire, especially at low loads.

[0004] 2. High energy consumption: The fan runs continuously at full speed, resulting in significant additional energy consumption.

[0005] 3. Noise and wear: Mechanical damper adjustment structure is complex and prone to failure after long-term use.

[0006] 4. Mechanical air volume linkage device: The gas valve and the damper are adjusted synchronously through the linkage mechanism, but it is limited by mechanical precision, making it difficult to achieve the optimal air-fuel ratio in the entire operating range, and the maintenance cost is high.

[0007] The above technical issues indicate that existing gas stove designs have significant shortcomings in terms of combustion efficiency, exhaust emissions, thermal efficiency, and energy consumption, failing to fully meet modern users' demands for energy conservation, environmental protection, safety, and high efficiency. Therefore, there is an urgent need to develop a high-efficiency premixed, airflow-adaptive commercial gas stove to solve these technical problems and improve the overall performance of gas stoves.

[0008] Related patent technology similar to this invention: CN100483028C – A premixed burner

[0009] This patent relates to a premixed burner for kitchen stoves (such as those used in hotels and canteens). Its structure includes a fixed base, a height adjustment ring, a combustion plate, a flame suppressor ring, and a constant flame cap. By stacking the height adjustment ring, it can accommodate the height requirements of different stoves. Simultaneously, inclined mixing gas passages (with an inclination angle of 2–10 degrees, preferably 3–7 degrees) are provided on the combustion plate, achieving a simple structure, convenient installation and maintenance, and the ability to handle multiple specifications.

[0010] Although the scheme is simple in structure and adaptable, the spiral inclined hole (the mixing gas passage is an inclined hole) it introduces will increase gas resistance and reduce mixing efficiency in practical applications. Moreover, it mainly promotes mixing through simple geometric inclination, which cannot achieve an efficient and uniform gas-air premixed state in a very short distance. It still has problems such as insufficient mixing, unstable combustion, and limited improvement in thermal efficiency. Summary of the Invention

[0011] To address the problems existing in the prior art, this invention provides a highly efficient premixed airflow adaptive commercial gas stove that can meet and improve gas usage efficiency and increase safety performance.

[0012] The present invention is implemented as follows: a high-efficiency premixed air volume adaptive commercial gas stove, including a stove body, a gas system, and an intelligent control system;

[0013] The main body of the stove is a square frame, including the stove head, support, burner head, and burner burner; the gas system includes a turbocharger, premixing pipe, gas check valve, main gas pipeline, and constant open flame gas pipeline; the turbocharger includes an air inlet, a gas inlet, a gas-air outlet, and a volute, where air and gas enter the blower from their respective inlets and are initially mixed within the volute under the action of its blades; the premixing pipe is connected to the blower outlet and includes a tapering section, a widening section, and an airfoil fin assembly, wherein the airfoil fin assembly is divided into a left fin and a right fin;

[0014] The intelligent control system includes a control board and dual flameout solenoid protection valves. The system adopts PID closed-loop control, which dynamically adjusts the opening degree (α) of the gas valve by real-time monitoring of the speed (n) and air flow (Q_{air}) of the turbocharger fan, so that the gas flow (Q_{gas}) and air flow are strictly matched with the preset equivalent ratio (Φ_{set}).

[0015] Furthermore, the inner and outer walls of the stove head and support are made of 304 stainless steel, which is easy to clean; the stove head and burner head are made of cast iron, which is resistant to high temperature and corrosion.

[0016] Furthermore, the tapering and abrupt expansion sections utilize the Venturi effect to increase the gas velocity and then suddenly decrease it, inducing shear vortices to enhance the mixing effect. The airfoil fin group induces longitudinal vortices in the boundary layer, enhancing lateral mixing, breaking laminar stratification, changing the flow field structure, and shortening the mixing distance.

[0017] Furthermore, the vortices generated by the first left fin and the first right fin rotate in opposite directions, forming a pair of symmetrical longitudinal vortices. The shearing action between the two vortices promotes the lateral exchange of fluid and stabilizes the vortex structure. The symmetrical vortices generated support each other, preventing a single fin from causing the airflow to deflect to one side.

[0018] Furthermore, the included angle of the fins is 35°. The airfoil fin assembly uses the effect of the vortex generator to induce longitudinal vortices in the boundary layer, enhance lateral mixing, break laminar stratification, change the flow field structure, and shorten the mixing distance, thereby ensuring that the gas and air reach a uniform mixing state within a very short distance, and ultimately achieve efficient and stable combustion.

[0019] Furthermore, the control algorithm performs PID calculations based on the flow deviation (e=Φ_{set}-Q_{gas} / Q_{air}), outputs valve opening commands, and enhances turbulent mixing through the Venturi effect and airfoil fin group in the premixing pipe to ensure that the gas-air reaches a uniform mixing state within a very short distance.

[0020] Furthermore, the control board adjusts the fan speed based on the above calculation results to always maintain the optimal ratio for complete combustion; the dual flameout electromagnetic protection valve includes a leakage flameout electromagnetic protection valve, a gas leakage flameout electromagnetic protection valve, and a manual adjustment valve, used to cut off the gas input in case of leakage or gas leakage.

[0021] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0022] 1. This invention incorporates a premixing pipe at the fan outlet. The converging section within the pipe utilizes the Venturi effect to accelerate the airflow, resulting in maximum dynamic pressure and minimum static pressure at the throat. This causes instability in the shear layer of the sudden expansion section, leading to vortex shearing at the boundary between the high-speed and low-speed airflow zones. The breakup of these vortices dissipates energy, transforming into small-scale turbulence. The airfoil fin assembly within the pipe acts as a vortex generator, inducing vortices that enhance lateral mixing between fluids, breaking laminar stratification, shortening the mixing distance, transferring the main kinetic energy to the boundary layer, and ensuring that the pressure loss within the pipe remains within the system's allowable range. Ultimately, this solves the problem of uneven gas mixing within the fan.

[0023] 2. The present invention has an intelligent control system inside the gas stove. By calculating the impeller diameter and height and the air flow at the fan outlet, it finally calculates the fan speed that matches the gas flow output by the valve opening, so as to achieve the preset optimal mixing ratio and realize the gas stove's high efficiency and energy saving.

[0024] 3. This invention is equipped with a dual flameout electromagnetic protection valve, a gas sensor and a leakage current protector, which will automatically shut down the equipment in time in case of gas or electrical leakage, ensuring the safety and health of users.

[0025] 4. This invention solves the problems of incomplete combustion, low energy efficiency, and poor safety of traditional gas stoves, and has significant innovation and application prospects. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of the stove system provided in an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of the stove system provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the premixed pipe structure provided in an embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of the premixed pipe provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the gas mixing principle in the premixed tube provided in an embodiment of the present invention;

[0031] Figure 6 This is a flowchart of the intelligent control process for a gas stove provided in an embodiment of the present invention;

[0032] In the diagram: 1. Main body of the stove; 11. Stove head; 12. Support; 13. Stove head; 14. Burner head; 2. Gas system; 21. Booster fan; 22. Premix pipe; 23. Main gas pipeline; 24. Constant open flame gas pipeline; 221. Gradual narrowing section; 222. Sudden expansion section; 223. First left fin; 224. First right fin; 225. Second left fin; 226. Second right fin; 3. Intelligent control system; 31. Electrically controlled valve; 32. Double flameout electromagnetic protection valve; 33. Control board. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] like Figure 1 As shown, the high-efficiency premixed air volume adaptive commercial gas stove provided in this embodiment of the invention includes a stove body 1, a gas system 2, and an intelligent control system 3.

[0035] The main body of the stove 1 is generally in the shape of a square frame, as shown below. Figure 1 As shown, it includes a stove head 11, a support 12, a stove burner 13, and a burner head 14. The inner and outer walls of the stove head 11 and the support 12 are made of 304 stainless steel, which is easy to clean. The stove burner 13 and the burner head 14 are made of cast iron, which is resistant to high temperature and corrosion.

[0036] The gas system 2 includes a turbocharger 21, a premixing pipe 22, a main gas pipeline 23, and a constant-flame gas pipeline 24; such as Figure 4As shown, the premixing pipe 22 includes a tapered section 221 and a sudden expansion section 222. The airfoil fins of the tapered section 221 are composed of a first left fin 223 and a first right fin 224, and the airfoil fins of the sudden expansion section 222 are composed of a second left fin 225 and a second right fin 226. The tapered section 221 and the sudden expansion section 222 in the premixing pipe utilize the Venturi effect to induce shear vortices by increasing the gas velocity followed by a sudden drop, thereby enhancing the mixing effect. The airfoil fins are arranged in pairs with an angled design to form vortex structures in a specific direction in the flow field, thereby controlling the flow more efficiently. For example, the vortices generated by the first left fin 223 and the first right fin 224 rotate in opposite directions, forming a pair of symmetrical longitudinal vortices. This structure can enhance lateral mixing. The shearing action between the two vortices promotes lateral fluid exchange and stabilizes the vortex structure. The symmetrical vortices generated support each other, preventing a single fin from causing the airflow to deflect to one side and extending the survival distance of the vortex. The angle of the fins also determines the intensity of the vortex; the larger the angle, the stronger the vortex, but the greater the pressure loss. Based on the structural characteristics of the pipeline, this invention designs the angle to be 35°. Therefore, the airfoil fin assembly utilizes the vortex generator to induce longitudinal vortices in the boundary layer, enhancing lateral mixing, breaking laminar stratification, changing the flow field structure, and shortening the mixing distance. This ensures that the gas and air reach a uniform mixing state within a very short distance, ultimately achieving efficient and stable combustion.

[0037] The intelligent control system 3 includes an electrically controlled valve 31, a dual flameout solenoid protection valve 32, and a control board 33; such as Figure 6 As shown, the intelligent control system employs PID closed-loop control. By real-time monitoring of the turbocharger fan's speed (n), airflow (Q_{air}), and impeller diameter and height, it dynamically adjusts the gas valve opening degree (α) to ensure that the gas flow (Q_{gas}) strictly matches the airflow with a preset equivalent ratio (Φ_{set}). The control algorithm performs PID calculations based on the flow deviation (e=Φ_{set}-Q_{gas} / Q_{air}), outputs valve opening commands, and finally calculates the fan airflow appropriate for the gas flow output by the electrically controlled valve 31. The control board 33 adjusts the fan speed based on the above calculation results to achieve the preset optimal mixing ratio, thus realizing the gas stove's high efficiency and energy saving. The dual flameout electromagnetic protection valve 32 is used to urgently cut off the gas input in case of electrical or gas leakage, ensuring user safety.

[0038] The high-efficiency premixed airflow adaptive commercial gas stove provided in this invention embodiment achieves efficient combustion, energy-saving control, and safety control. Firstly, the design of the stove body ensures the durability and ease of cleaning of the overall structure. The burner head and burner are made of cast iron, capable of withstanding high temperatures and corrosion, allowing the system to maintain stable operation even in high-temperature environments. The premixing pipe, connected to the fan outlet, includes a converging pipe, a sudden expanding pipe, and an airfoil fin assembly, wherein the airfoil fin assembly is divided into left and right fins. The converging pipe and sudden expanding pipe utilize the Venturi effect to increase gas velocity followed by a sudden drop, inducing shear vortices to enhance the mixing effect. The airfoil fin assembly induces longitudinal vortices in the boundary layer, enhancing transverse mixing, breaking laminar stratification, changing the flow field structure, and shortening the mixing distance, thereby optimizing flow performance.

[0039] The intelligent control system ensures system safety through multi-layered protection measures. Electrically controlled valves regulate the gas intake, while the control board precisely controls the fan speed, maintaining the optimal gas-air mixture ratio for complete combustion. Furthermore, the dual flameout solenoid valves quickly cut off the gas supply in case of electrical or gas leakage, preventing accidents. Simultaneously, a manual control valve provides users with a manual operation option in emergencies, further enhancing system safety.

[0040] The commercial gas stove provided in this invention optimizes the gas-air mixing process and incorporates advanced safety control mechanisms, thereby improving combustion efficiency and thermal energy utilization while significantly enhancing user safety. This design enables the system to provide stable, efficient, and safe combustion in practical use, making it suitable for various commercial kitchen scenarios.

[0041] This invention addresses the problems of insufficient mixing efficiency and poor combustion stability in commercial gas stoves used in industrial applications. Traditional stoves rely on natural ejection to diffuse and mix gas and air within a premixing space. Under high load operation, this easily leads to localized lean or rich combustion zones, resulting in decreased combustion efficiency and excessive carbon monoxide emissions. These problems are even more pronounced in the high-intensity, continuous operation environment of the catering industry, not only reducing thermal efficiency but also increasing safety hazards and energy costs. This invention addresses these pain points in industrial applications by introducing a turbocharger fan 21 and a premixing pipe 22 with a specific geometry into the gas system 2. This allows for rapid and uniform mixing of gas and air within a limited space.

[0042] At the operational principle level, the core of the gas system 2 is the premixing pipe 22. The premixing pipe 22 is formed by sequentially connecting a converging section 221 and a sudden expansion section 222. The converging section 221 significantly increases the gas velocity by gradually reducing its cross-sectional area, while the sudden expansion section 222 causes a rapid decrease in velocity due to a sudden increase in cross-sectional area, creating a significant shear effect and a local low-pressure zone, thereby driving the mixing process. Compared to the slow diffusion mixing method of straight pipes, this structure can generate strong shear and vortex decomposition effects in a very short time, significantly shortening the physical distance required for gas and air diffusion mixing, and providing ideal initial conditions for subsequent stable combustion.

[0043] The key to further design lies in the airfoil fin assemblies arranged within the tapering section 221 and the expanding section 222. The tapering section 221 houses the first left fin 223 and the first right fin 224, while the expanding section 222 houses the second left fin 225 and the second right fin 226. All fins are arranged symmetrically with an included angle of 35 degrees. As the fluid flows around them, a longitudinal vortex structure is induced. Because the vortices formed by the two fins are in opposite directions, a symmetrical double-vortex system is established in the flow field. The shearing effect of these double vortices enhances the lateral mixing efficiency, while their mutual support prevents flow deviation, allowing the gas to break the laminar boundary during short-range transport and quickly form a uniform turbulent state. Compared to a single-sided vortex structure, this design effectively avoids airflow deviation and ensures homogeneous mixing.

[0044] In terms of combustion adaptability, the turbocharger fan 21 and the premixing pipe 22 work together to give the system adaptive airflow characteristics. Under the regulation of the intelligent control system 3, the fan 21 adjusts the airflow in real time according to the gas flow rate, avoiding air-fuel ratio deviation caused by gas source pressure fluctuations. Combined with the enhanced mixing effect of the fin-induced vortex, the combustion zone can maintain a state close to the theoretical air-fuel ratio under different operating conditions, thereby ensuring flame stability and forming a transparent blue flame, while significantly reducing carbon monoxide and unburned hydrocarbon emissions, meeting the requirements of clean and efficient combustion.

[0045] The introduction of the vortex structure also improves flame propagation characteristics. The turbulent pulses generated by the vortex act on the combustion leading edge, increasing flame propagation speed and reducing the risk of backfire and flameout. Under high heat load conditions, the flame can remain stably attached to the burner head 14, avoiding flame drift caused by uneven mixing or abnormal flow rates. Based on this principle, combustion efficiency and thermal power are improved simultaneously, meeting the catering industry's requirements for high heat load and rapid thermal response.

[0046] From an industrial application perspective, this invention offers significant advantages in energy efficiency and emission control. The gas stove designed for continuous operation in commercial kitchens, through the coordinated operation of the stove body 1, gas system 2, and intelligent control system 3, not only achieves adaptive airflow and efficient premixing but also eliminates the need for complex maintenance. This technology reduces gas consumption, improves the working environment, and extends equipment lifespan. Furthermore, this combustion technology can be extended to industrial heating, food processing, and other applications requiring stable and efficient heat sources, demonstrating broad application potential.

[0047] Example 1:

[0048] In a commercial dual-burner gas stove, the main body 1 is made of 304 stainless steel through a single pressing process. The gas system 2 includes a turbocharger fan 21 and a premixing pipe 22. Gas enters the converging section 221 through the main gas pipeline 23, while air is simultaneously supplied under the action of the fan 21. The two fluid streams form a high-speed jet in the converging section 221. A significant shearing effect is formed in the expansion section 222, which, combined with the symmetrical arrangement of the first left fin 223 and the first right fin 224, generates longitudinal vortex pairs in opposite directions, thereby achieving rapid and uniform mixing. The device can maintain stable blue flame combustion even under full load conditions, and tests show that carbon monoxide emissions are below 0.02%.

[0049] Example 2:

[0050] On a large-scale catering-specific wok, the gas system 2 is equipped with a more powerful turbocharger fan 21. Four fins are installed inside the premixing pipe 22: the first left fin 223 and the first right fin 224 are arranged in the converging section 221, and the second left fin 225 and the second right fin 226 are arranged in the expanding section 222. The fin angle is uniformly set at 35 degrees to ensure a balance between vortex intensity and pressure drop. Under the real-time adjustment of the intelligent control system 3, the fan 21 automatically adjusts the airflow according to the gas flow signal, ensuring that the flame in the combustion zone remains stably attached to the burner head 14, preventing flameout and backfire during continuous high-intensity operation.

[0051] As can be seen from the two embodiments above, the present invention can achieve rapid gas-gas premixing and adaptive airflow adjustment in commercial cooktops of different sizes and power levels, solving the problems of insufficient mixing and unstable combustion under high loads in traditional structures. Its design not only improves combustion efficiency but also significantly reduces pollutant emissions, demonstrating promising prospects for industrial application.

[0052] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency premixed airflow adaptive commercial gas stove, characterized in that, This includes the main cooktop, the gas system, and the intelligent control system. The gas system includes a turbocharger fan, a premixed pipe, a main gas pipeline, and a constant open flame gas pipeline; The premixed tube includes a tapering section and a sudden expansion section. The tapering section is provided with a first left fin and a first right fin, and the sudden expansion section is provided with a second left fin and a second right fin. The continuous structure of the gradually narrowing section and the abruptly expanding section utilizes the effect of the fluid velocity first increasing and then suddenly decreasing to form a shear vortex to enhance the gas mixing effect. The first left fin and the first right fin rotate in opposite directions to form a symmetrical longitudinal vortex pair to enhance lateral mixing, and the included angle of the fins is 35 degrees.

2. The high-efficiency premixed airflow adaptive commercial gas stove according to claim 1, characterized in that, The first left fin and the first right fin, as well as the second left fin and the second right fin, all adopt an airfoil structure and are symmetrically arranged on both sides of the pipeline axis.

3. The high-efficiency premixed airflow adaptive commercial gas stove according to claim 1, characterized in that, The turbocharger is connected to the intelligent control system, which adjusts the air volume in real time according to the gas flow to maintain a near-theoretical air-fuel ratio.

4. A method for rapid and uniform mixing of fuel gas and air, characterized in that, Includes the following steps: Step 1: Introduce the gas and air together into the converging section of the premixing pipe, and use the increased flow rate to create an intake effect; Step two involves passing the gas through the sudden expansion section, where the flow velocity drops sharply, creating a shearing effect that induces vortex generation. Step 3: Enhance lateral mixing by forming symmetrical longitudinal vortices with opposite directions using paired airfoil fins; Step four: Extend the survival distance by using vortex stabilization support, thereby achieving uniform mixing of gas and air within a short distance.

5. The method according to claim 4, characterized in that, The included angle of the airfoil fins is set at 35 degrees to achieve a balance between mixing efficiency and pressure drop.

6. An adaptive airflow control system for commercial gas stoves, characterized in that, include: The fan regulation module is used to collect gas flow signals and adjust the air supply volume; The sensor module is used to detect combustion zone temperature and flame stability parameters; The control unit is used to calculate the target air volume based on the collected parameters and drive the fan output.

7. The system according to claim 6, characterized in that, The control unit calculates the fan speed using a proportional-integral-derivative control algorithm to achieve dynamic airflow adjustment.

8. An airfoil fin structure for enhancing combustion stability, characterized in that, Located inside the gas premixing pipe, the fins are arranged at an angle along the flow direction, forming a 35-degree angle between the fins. By inducing longitudinal vortices in the boundary layer, laminar stratification is disrupted, forming a turbulent state and improving the uniformity of gas mixing.

9. The airfoil fin structure according to claim 8, characterized in that, The fin group has paired fins in both the tapering and expanding sections, and the fins in the front and rear sections are arranged in the same direction to maintain the continuity of the vortex.

10. A method for improving the combustion stability of a commercial gas stove, characterized in that, By combining adaptive airflow control with airfoil vortex induction, the combustion zone is kept close to the theoretical air-fuel ratio under different loads, and longitudinal vortex-enhanced lateral mixing is used to prevent flame de-ignition and flashback.

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