Double-fan air supply type barbecue oven and air supply control system

Abstract

The invention relates to a double-fan air supply type barbecue oven which comprises a barbecue oven body and an air supply cavity. The gas supply chamber comprises a gas flux regulating valve, two paths of gas supply branch pipes communicated with the gas flux regulating valve, premixing spray heads connected with the end parts of the gas supply branch pipes respectively, a first fan arranged in the gas supply chamber and a second fan arranged on the side wall of the gas supply chamber; the design that the independent double fans are adopted in the air supply chamber to supply air to the fire grate combustor and the combustion position of the furnace cavity is adopted, the fire grate and the furnace cavity supply air independently to avoid mutual interference of airflow, the double fans can independently adjust the air supply amount and pressure, and the problem of fire grate backfire caused by insufficient oxygen supply of a single fan is solved; and meanwhile, the gas inflow and the rotating speed of the second fan can be synchronously adjusted when the control knob is rotated, gas and air supply adjustment are prevented from being disjointed from the physical structure, the gas-air mixing ratio can be dynamically kept in the optimal interval, and the combustion efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas supply for barbecue grills, and particularly to a double-fan gas supply type barbecue grill and a gas supply control system. Background Art

[0002] A gas barbecue grill is a cooking device that uses natural gas or liquefied gas as fuel. It generates heat energy by burning gas to heat food. Unlike a charcoal barbecue grill that requires lighting charcoal, it only needs to connect a gas cylinder and turn on the switch to be used. It is more economical and practical than an electric barbecue grill, and its energy consumption is lower than traditional charcoal grilling and electric grilling methods. The gas barbecue grill can quickly control the firepower by adjusting the valve. The combustion process is smokeless and dust-free, reducing environmental pollution. At the same time, it is equipped with safety devices such as flameout protection and pressure-resistant valves to reduce the risk of leakage or accidental flameout, and is suitable for various scenarios such as outdoor barbecues, family gatherings, and commercial kitchens, and is increasingly favored by consumers.

[0003] Nowadays, most of the air supply designs for gas barbecue grills use a single fan to supply air to the burner of the fire grate and the combustion position in the furnace cavity at the same time. Although the structure is simplified, there are the following potential problems: The single fan needs to meet the ignition requirements of the burner of the fire grate and the combustion support requirements of the furnace cavity at the same time, which easily leads to an imbalance in the mixing ratio of gas and air, resulting in insufficient combustion of the fire grate or excessive oxygen supply in the furnace cavity, affecting the overall combustion efficiency. If the air supply pressure of the fan is insufficient, it may cause the flame of the fire grate to flash back or local high temperature, increasing the risk of emission of harmful gases such as carbon monoxide. In addition, to cover the air supply requirements of the double area, the fan needs to operate at a higher power, resulting in an increase in gas consumption and electricity costs, and at the same time, it is easy to cause the fan components (such as motors, blades) to be heated and aged, and long-term operation may reduce the fan efficiency and even cause failures. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a double-fan gas supply type barbecue grill and a gas supply control system.

[0005] The present invention is realized by the following technical solutions:

[0006] A double-fan gas supply barbecue grill, comprising a barbecue grill body and a gas supply chamber located on one side or both sides of the barbecue grill body. The barbecue grill body includes a furnace cavity and a fire row burner oppositely arranged in the furnace cavity. The gas supply chamber includes a gas flow regulating valve, two gas supply branch pipes connected to the gas flow regulating valve, premixing nozzles respectively connected to the ends of the gas supply branch pipes, a first fan arranged inside the gas supply chamber, and a second fan arranged on the side wall of the gas supply chamber. A fire row air supply hole is opened above the fire row burner, and an air supply opening is opened on the upper side inside the gas supply chamber. The first fan is installed at the air supply opening and supplies air to the fire row air supply hole through the air supply opening. A side cover plate is arranged on the side of the gas supply chamber, and an upper air inlet hole and a lower air inlet hole are opened on the side cover plate. The upper air inlet hole is arranged close to the first fan, and the second fan is used to make air enter at the lower air inlet hole and premix with the gas at the premixing nozzle.

[0007] According to the above technical solution, preferably, the end of the premixing nozzle extends behind the fire row burner for supplying gas to the fire row burner.

[0008] According to the above technical solution, preferably, a fan outer chamber is fixedly connected outside the first fan. When the side cover plate is closed, the fan outer chamber forms a closed structure provided with an upper air inlet hole.

[0009] According to the above technical solution, preferably, an ignition needle is installed on the side wall of the gas supply chamber, and the end of the ignition needle extends and is close to the fire row burner.

[0010] According to the above technical solution, preferably, the gas flow regulating valve is connected with a control knob, and rotating the control knob can simultaneously adjust the gas flow and the rotation speed of the second fan.

[0011] According to the above technical solution, preferably, an installation plate is arranged on the gas flow regulating valve, a hollow potentiometer is connected outside the installation plate, the gas flow regulating valve is connected with the control knob through a rotating shaft, and when the rotating shaft of the gas flow regulating valve rotates, it can drive the hollow potentiometer to rotate.

[0012] The present application discloses a gas supply control system for the above-mentioned double-fan gas supply barbecue grill, including a hollow potentiometer, a micro single-chip computer, and a second fan. While adjusting the gas flow, the rotating shaft rotates, causing the resistance value of the hollow potentiometer to change. The micro single-chip computer collects the resistance value of the hollow potentiometer and outputs a PWM signal to the second fan to adjust the wind speed of the second fan.

[0013] According to the above technical solution, preferably, the resistance value of the hollow potentiometer is collected by the micro single-chip computer, the opening angle value of the gas flux regulating valve is calculated, and the micro single-chip computer outputs PWM signals with different widths according to the opening angle value to control and adjust the wind speed of the second fan.

[0014] The beneficial effects of the present invention are as follows:

[0015] Since the burner needs high-concentration oxygen to be premixed with gas at the premixing nozzle to ensure rapid ignition and stable combustion of the gas, and the furnace cavity needs appropriate air to pass through the air supply holes of the burner to maintain the heat circulation in the combustion area, therefore, in this application, a design of using independent double fans in the air supply chamber to supply air to the burner and the combustion area of the furnace cavity respectively is adopted. The independent air supply of the burner and the furnace cavity avoids the interference of airflows with each other, and the double fans can independently adjust the air supply volume and pressure, avoiding the occurrence of the problem of burner flashback caused by insufficient oxygen supply of a single fan;

[0016] At the same time, compared with the full-power operation of a single fan, in this application, two fans are used to separately supply air to the burner or the combustion area of the furnace cavity, which can effectively reduce the wear of the bearings and blades during the use of the fans and improve the service life of the fans;

[0017] In addition, this application can synchronously adjust the gas intake volume and the rotation speed of the second fan when turning the control knob, avoiding the disconnection between gas and air supply adjustment from the physical structure, simplifying the operation process that originally required the cooperation of multiple knobs, dynamically maintaining the gas-air mixing ratio within the optimal range, avoiding the problems of excessive or insufficient oxygen caused by traditional separate adjustment, and improving the combustion efficiency. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 is a three-dimensional structural schematic diagram of the air supply chamber part of the present invention Figure 1 .

[0020] Figure 3 is a three-dimensional structural schematic diagram of the side cover plate part of the present invention.

[0021] Figure 4 is a three-dimensional structural schematic diagram of the gas flux regulating valve part of the present invention.

[0022] Figure 5 is a three-dimensional structural schematic diagram of the air supply chamber part of the present invention Figure 2 .

[0023] Figure 6 is a partial structural schematic diagram of the barbecue grill body part of the present invention.

[0024] Figure 7Schematic three-dimensional structure of the air supply chamber part of the present invention Figure 3 .

[0025] Figure 8 Schematic three-dimensional structure of the air supply chamber part of the present invention Figure 4 .

[0026] Figure 9 Schematic three-dimensional structure of the premixing nozzle part of the present invention Figure 1 .

[0027] Figure 10 Schematic three-dimensional structure of the premixing nozzle part of the present invention Figure 2 .

[0028] Figure 11 Schematic diagram of the principle of air-gas linkage in Embodiment 2 of the present invention.

[0029] In the figure: 1. Air supply chamber; 2. Burner; 3. Air supply holes of the burner; 4. First fan; 5. Outer fan housing; 6. Control knob; 7. Air supply branch pipe; 8. Premixing nozzle; 9. Side cover plate; 10. Upper air inlet hole; 11. Second fan; 12. Gas flux regulating valve; 13. Hollow potentiometer; 14. Mounting plate; 15. Air supply opening; 16. Ignition needle; 17. Premixing port; 18. Lower air inlet hole. Detailed implementation manners

[0030] In order to enable those skilled in the art of the present technology to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and the best embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the invention without creative efforts shall fall within the scope of protection of the invention.

[0031] In the description of the invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] Embodiment 1: As shown in the figure, the present invention includes a barbecue grill body and a gas supply chamber 1 located on one or both sides of the barbecue grill body. The barbecue grill body includes a furnace cavity and a grate burner 2 oppositely arranged in the furnace cavity. The gas supply chamber 1 includes a gas flux regulating valve 12, two gas supply branch pipes 7 connected to the gas flux regulating valve 12, premixing nozzles 8 respectively connected to the ends of the gas supply branch pipes 7, a first fan 4 arranged inside the gas supply chamber 1, and a second fan 11 arranged on the side wall of the gas supply chamber 1. The barbecue grill is externally connected to gas, and the intake size is adjusted by the gas flux regulating valve 12. The gas flux regulating valve 12 mentioned in this example can adopt common regulating valves on the market, and the gas passage amount is adjusted by rotation, which belongs to the prior art and will not be elaborated in this application. At the same time, an ignition needle 16 is installed on the side wall of the gas supply chamber 1, and the end of the ignition needle 16 extends towards and is close to the grate burner 2.

[0034] There are grate air supply holes 3 opened above the grate burner 2, and an air supply opening 15 is opened on the upper side inside the gas supply chamber 1. The first fan 4 is installed at the air supply opening 15 and sends air to the grate air supply holes 3 through the air supply opening 15. In this example, an outer fan chamber 5 is fixedly connected to the outside of the first fan 4. When the side cover plate 9 is closed, the outer fan chamber 5 forms a closed structure provided with upper air inlet holes 10. By optimizing the air duct design to form independent air supply in different zones, the rotation speed of the first fan 4 can be appropriately reduced to match the technical requirement that the furnace cavity needs an appropriate amount of air to pass through the grate air supply holes 3 to maintain the heat cycle in the combustion zone.

[0035] A side cover plate 9 is arranged on the side of the gas supply chamber 1, and the second fan 11 is installed on the side cover plate 9. The side cover plate 9 is provided with upper air inlet holes 10 and lower air inlet holes 18. The upper air inlet holes 10 are arranged close to the first fan 4. The second fan 11 makes air enter at the lower air inlet holes 18 and premixes with the gas at the premixing port 17 of the premixing nozzle 8. The end of the premixing nozzle 8 extends behind the grate burner 2 for supplying gas to the grate burner 2. This setting enables an independent fan (the second fan 11) in the gas supply chamber 1 to supply gas to the grate burner 2, and the rotation speed of the second fan 11 can be independently controlled to meet the technical requirement that the grate burner 2 needs high-concentration oxygen to premix with the gas at the premixing nozzle 8, and the combustion performance and equipment reliability are optimized through zoning regulation.

[0036] In addition, the gas flux regulating valve 12 is connected with a control knob 6. Rotating the control knob 6 can simultaneously adjust the gas flux and the rotation speed of the second fan 11. Specifically, in this example, a mounting plate 14 is arranged on the gas flux regulating valve 12, and a hollow potentiometer 13 is externally connected to the mounting plate 14. The gas flux regulating valve 12 is connected to the control knob 6 through a rotating shaft. When the rotating shaft of the gas flux regulating valve 12 rotates, it can drive the hollow potentiometer 13 to rotate.

[0037] Embodiment 2: The present application discloses a gas supply control system for the above-mentioned double-fan gas supply barbecue grill, which includes a hollow potentiometer 13, a micro single-chip computer, and a second fan 11. While adjusting the gas flux, the rotating shaft rotates, causing the resistance value of the hollow potentiometer 13 to change. The micro single-chip computer collects the resistance value of the hollow potentiometer 13 and outputs a PWM signal to the second fan 11 to adjust the wind speed of the second fan 11.

[0038] Among them, by collecting the resistance value of the hollow potentiometer 13 through the micro single-chip computer, the opening angle value of the gas flux regulating valve 12 is calculated. The micro single-chip computer outputs PWM signals with different widths according to the opening angle value to control and adjust the wind speed of the second fan 11. This setting enables the user to complete the firepower adjustment (gas flow) and combustion intensity control (rotation speed of the second fan 11) only by rotating the control knob 6, realizing the linkage of air and gas, simplifying the original operation process that requires multiple knobs to cooperate, reducing the number of components to be installed in the device, having a high integration degree, saving the installation space, and facilitating operation in a particularly narrow installation space. At the same time, the integrated linkage design of the present application avoids the disconnection between gas and air supply adjustment from the physical structure, can dynamically maintain the gas-air mixing ratio in the optimal range, and avoids the problems of excessive or insufficient oxygen caused by traditional separate adjustment, reducing the risk of flame jitter or flashback.

[0039] To sum up, through the design of using independent double fans to supply air to the burner of the fire grate and the combustion area of the furnace cavity respectively in the gas supply chamber, the independent air supply of the fire grate and the furnace cavity avoids the mutual interference of airflows. The double fans can independently adjust the air supply volume and pressure, avoiding the occurrence of the problem of flashback of the burner of the fire grate caused by insufficient oxygen supply of a single fan. At the same time, compared with the full-power operation of a single fan, the present application uses two fans to supply air separately to the burner of the fire grate or the combustion area of the furnace cavity, which can effectively reduce the wear of the bearings and blades during the use of the fans and improve the service life of the fans. In addition, the present application can synchronously adjust the gas intake volume and the rotation speed of the second fan when rotating the control knob, avoiding the disconnection between gas and air supply adjustment from the physical structure, simplifying the original operation process that requires multiple knobs to cooperate, dynamically maintaining the gas-air mixing ratio in the optimal range, and avoiding the problems of excessive or insufficient oxygen caused by traditional separate adjustment, thus improving the combustion efficiency.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A double-fan air supply type barbecue grill, comprising a barbecue grill body and an air supply chamber (1) located on one side or both sides of the barbecue grill body, wherein the barbecue grill body comprises a furnace cavity and a fire grate burner (2) arranged opposite to the furnace cavity, characterized in that: The air supply chamber (1) comprises a gas flux regulating valve (12), two air supply branch pipes (7) connected to the gas flux regulating valve (12), premixing nozzles (8) respectively connected to the ends of the air supply branch pipes (7), a first fan (4) arranged inside the air supply chamber (1), and a second fan (11) arranged on the side wall of the air supply chamber (1). A fire grate air supply hole (3) is provided above the fire grate burner (2), an air supply opening (15) is provided on the upper inner side of the air supply chamber (1), the first fan (4) is installed at the air supply opening (15), and supplies air to the fire grate air supply hole (3) through the air supply opening (15). A side cover plate (9) is arranged on the side of the air supply chamber (1), and an upper air inlet hole (10) and a lower air inlet hole (18) are provided on the side cover plate (9). The upper air inlet hole (10) is arranged close to the first fan (4), and air is introduced into the lower air inlet hole (18) through the second fan (11) and is premixed with the gas at the premixing nozzle (8).

2. A dual-fan air supply type barbecue oven according to claim 1, characterized in that: The end of the premixing nozzle (8) extends to the rear of the fire bar burner (2) and is used to supply gas to the fire bar burner (2).

3. A dual-fan air supply type barbecue oven according to claim 2, characterized in that: The first fan (4) is fixedly connected to a fan outer bin (5), and when the side cover (9) is closed, the fan outer bin (5) forms a closed structure provided with an upper air inlet hole (10).

4. A dual-fan air supply type barbecue oven according to claim 1, characterized in that: An ignition needle (16) is installed on the side wall of the air supply chamber (1), and the end of the ignition needle (16) extends toward and is arranged close to the fire bar burner (2).

5. The double-fan air supply type barbecue oven according to any one of claims 1 to 4, characterized in that: The gas flux regulating valve (12) is connected to a control knob (6), and rotating the control knob (6) can simultaneously adjust the gas flux and the rotation speed of the second fan (11).

6. A dual-fan air supply type barbecue oven according to claim 5, characterized in that: The gas flux regulating valve (12) is provided with a mounting plate (14), and the mounting plate (14) is externally connected to a hollow potentiometer (13). The gas flux regulating valve (12) is connected to the control knob (6) via a rotating shaft, and when the rotating shaft of the gas flux regulating valve (12) rotates, it can drive the hollow potentiometer (13) to rotate.

7. An air supply control system for a dual-fan air supply barbecue oven as claimed in claim 6, characterized in that: It includes a hollow potentiometer (13), a micro single chip microcomputer and a second fan (11), While adjusting the gas flux, the rotating shaft rotates, causing the resistance value of the hollow potentiometer (13) to change. The micro single-chip computer collects the resistance value of the hollow potentiometer (13) and outputs a PWM signal to the second fan (11) to adjust the wind speed of the second fan (11).

8. A gas supply control system according to claim 7, characterized in that: The micro single chip microcomputer collects the resistance value of the hollow potentiometer (13) to calculate the opening angle value of the gas flux regulating valve (12); the micro single chip microcomputer outputs PWM signals of different widths according to the opening angle value to control and adjust the wind speed of the second fan (11).

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