A pellet combustion structure for a grill

Abstract

The utility model provides a kind of pellet combustion structure of grill, it is related to pellet grill technical field.A kind of pellet combustion structure of grill, including controller, sensor, shell, feeding mechanism, air supply mechanism, combustion chamber, further include controller;The feeding mechanism includes adjustable speed motor and feeding screw;The air supply mechanism is adjustable speed fan, and the controller is electrically connected adjustable speed motor and adjustable speed fan respectively;The combustion chamber is communicated with the feeding pipe of feeding mechanism;The combustion chamber is equipped with the combustion board of inclination inside, the combustion board is concave arc structure, and several air holes and ash hole are arranged on it.The utility model aims at solving the problem that pellet fuel burns too fast or too slow, or uncontrolled stack combustion, so that pellet fuel can release heat continuously and stably during combustion process.

Description

Technical Field

[0001] This utility model relates to the field of pellet grill technology, and in particular to a pellet combustion structure for a grill. Background Technology

[0002] Currently, in the grill industry, especially for grills using pellet fuel, precise temperature control and efficient combustion have long been technical challenges. Most pellet-fueled grills on the market use ordinary motors for feeding, which cannot adjust the feeding frequency according to actual temperature requirements. This easily leads to fuel accumulation or insufficient fuel supply, resulting in unstable combustion. The combustion chamber is mostly a simple cavity structure, lacking optimized design for fuel flow and airflow distribution. This makes pellet fuel prone to burning too fast or too slow, or uncontrolled accumulation and combustion, affecting both the combustion efficiency of the pellet fuel and the inability to achieve precise temperature control.

[0003] For example, patent document No. 201821966074.0, entitled "A Pellet Fuel Barbecue Grill," discloses a pellet fuel barbecue grill, relating to the field of barbecue grill technology. This pellet fuel barbecue grill includes a grill body equipped with an ambient temperature sensor and an internal temperature sensor. The grill body contains, from top to bottom, a grill rack, an oil guide plate, and a heat transfer plate. A combustion chamber is inserted at the bottom of the grill body, located below the heat transfer plate, and an ignition device is located at the bottom of the combustion chamber. A fuel tank is located on one side of the grill body, with a feeding pipe extending into the grill body below the fuel tank. A feeding device connected to the feeding pipe is located inside the fuel tank. An electronic control board is located in the fuel tank, and the ambient temperature sensor, internal temperature sensor, feeding device, and ignition device are all connected to the electronic control board. This pellet fuel barbecue grill can control the internal temperature of the grill body according to changes in the ambient temperature, allowing the grill to automatically adapt to the ambient temperature and meet normal temperature control requirements in different external environments.

[0004] The pellet fuel barbecue grill described in the aforementioned patent document still suffers from defects such as insufficient pellet fuel, ash accumulation, and low thermal efficiency.

[0005] This invention aims to address the shortcomings of the existing technology by providing a pellet combustion structure for a grill, which achieves precise delivery, uniform combustion, and stable temperature control of pellet fuel through an adjustable speed feeding mechanism, an adjustable speed air supply mechanism, and an optimized combustion chamber structure. Utility Model Content

[0006] Based on this, it is necessary to provide a pellet combustion structure for a grill to address the problems of excessively fast or slow combustion of pellet fuel, or uncontrolled accumulation and combustion, in existing pellet grills.

[0007] To solve the problems of the existing technology, the present invention adopts the following technical solution:

[0008] A pellet combustion structure for a grill includes an outer shell, a feeding mechanism, an air supply mechanism, a combustion chamber, and a controller; the feeding mechanism includes an adjustable speed motor and a feeding screw; the air supply mechanism is an adjustable speed fan; the controller is electrically connected to the adjustable speed motor and the adjustable speed fan respectively; the combustion chamber is connected to the feeding pipe of the feeding mechanism; the combustion chamber is provided with an inclined combustion plate, the combustion plate has a concave arc-shaped structure, and has a plurality of ventilation holes and ash collection holes.

[0009] Furthermore: The housing is provided with a feeding pipe inside, the feeding screw is disposed in the feeding pipe, and the inner diameter of the feeding pipe matches the outer diameter of the feeding screw; a motor mounting hole is provided at the left end of the housing, the output shaft of the adjustable speed motor passes through the motor mounting hole and extends into the feeding pipe, and is fixedly connected to the feeding screw.

[0010] Furthermore, the lower end of the outer casing away from the combustion chamber is provided with a mounting hole for an adjustable speed fan.

[0011] Furthermore: A trapezoidal opening is provided on the upper part of the side of the outer casing near the adjustable speed motor, and the lower end of the trapezoidal opening is connected to the upper left side of the feeding pipe; a mounting bracket is provided in the middle of the top of the inner wall of the outer casing, and the lower part of the mounting bracket is fixedly connected to the feeding pipe.

[0012] Furthermore: The combustion chamber is provided at the right end of the outer casing, the upper end of the combustion chamber penetrates the outer casing, and several air holes are also provided on its surrounding walls.

[0013] Furthermore: The end of the combustion plate near the feed port is fixed to the bottom plane of the combustion chamber, and the end away from the feed port is raised by the support structure, forming a gap with the bottom of the combustion chamber.

[0014] Furthermore, the combustion chamber also includes a heating rod fixing component, which is a tubular structure and is laterally connected to the left side wall of the combustion chamber, that is, directly below the feeding pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] The controller of this invention accepts a temperature setpoint and starts the program after detecting the actual temperature of the target area through a temperature sensor. It automatically adjusts the motor speed, and the adjustable-speed motor drives the feeding screw, dynamically adjusting the amount of pellet fuel delivered according to actual combustion needs. Combined with the precise control of oxygen supply by the adjustable-speed fan, it achieves coordinated matching between feeding and oxygen supply. At the same time, the concave arc-shaped and inclined combustion plate structure in the combustion chamber guides the uniform distribution of fuel and promotes the gradual flow of fuel towards the combustion area through the tilt angle. The vent holes on the combustion plate, the air inlet, and the circular holes on the peripheral wall of the combustion chamber form a three-dimensional oxygen supply channel, ensuring that oxygen is accurately delivered to the combustion area, so that the pellet fuel is fully burned, reducing energy waste and improving combustion efficiency. The distance between the combustion plate and the bottom of the combustion chamber and the vent structure facilitate ash discharge and prevent accumulation from affecting combustion. The overall structure is compact and functionally coordinated, improving the stability and reliability of the equipment in long-term operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 4 This is a perspective view of the structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the combustion chamber of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of this utility model installed on the grill. Detailed Implementation

[0023] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0024] Please see Figures 1 to 6 As shown, this utility model discloses a pellet combustion structure for a grill, comprising a shell 1, a feeding mechanism 2, an air supply mechanism 3, a combustion chamber 4, and a controller 5. The shell 1 serves as the overall support frame, primarily providing support for the installation and positioning of each component. The feeding mechanism 2 transports pellet fuel to the combustion chamber 4, and the air supply mechanism 3 provides the combustion chamber 4 with the oxygen required for combustion. The combustion chamber 4 is the core area for pellet fuel combustion, and all components are integrated through the shell 1.

[0025] To address the problem of inaccurate control of pellet fuel feed rate in existing technologies, this technical solution improves the feeding mechanism 2.

[0026] Furthermore, the feeding mechanism 2 includes an adjustable speed motor 201 and a feeding screw 202. The speed of the adjustable speed motor 201 is determined by the controller 5, which can control the feeding amount.

[0027] Preferably, the housing 1 has a horizontally extending feeding pipe 203 inside, and a feeding screw 202 is coaxially disposed inside the feeding pipe 203. The inner diameter of the feeding pipe 203 matches the outer diameter of the feeding screw 202, forming a clearance fit. This ensures smooth screw rotation and prevents fuel leakage from the gap. The left end of the housing 1 has a motor mounting hole 102. The output shaft of the adjustable speed motor 201 passes through the motor mounting hole 102 and extends into the feeding pipe 203. It is fixedly connected to the left end of the feeding screw 202 through a coupling to achieve stable power transmission.

[0028] Furthermore, in order to facilitate the addition of pellet fuel, a trapezoidal opening 101 is provided on the upper part of the side of the outer shell 1 near the adjustable speed motor 201 (i.e., the upper left part). The lower end of the trapezoidal opening 101 is connected to the opening on the upper left side of the feeding pipe 203 to form a fuel addition channel, which makes it convenient for users to replenish fuel.

[0029] Furthermore, in order to fix the feeding pipe 203, that is, to prevent the feeding pipe 203 from being displaced or deformed due to vibration when the feeding screw 202 rotates, a mounting bracket 204 is welded to the inner wall of the top of the outer shell 1. The lower part of the mounting bracket 204 is fixedly connected to the outer wall of the feeding pipe 203, thereby enhancing the structural stability of the feeding pipe 203.

[0030] Furthermore, in order to provide sufficient and controllable oxygen for the combustion process of the pellet fuel, the air supply mechanism 3 is an adjustable speed fan, which is synchronously controlled by the controller. At the lower left end of the outer casing 1, that is, the end away from the combustion chamber 4, a circular fan mounting hole 301 is provided, and the adjustable speed fan is fixedly installed in the fan mounting hole 301 (the adjustable speed fan is not shown in the figure).

[0031] Therefore, in order to ensure the normal combustion of pellet fuel, that is, to prevent the pellet fuel from burning too fast or too slow and fuel accumulation, the combustion chamber 4 needs to be improved.

[0032] Preferably, the combustion chamber 4 is fixedly disposed at the right end of the outer casing 1, with its upper end open to form an output port for combustion heat, facilitating the upward diffusion of heat to the grilling area of ​​the grill. The left side wall of the combustion chamber 4 has a feeding port 401 that connects to the feeding pipe 203.

[0033] Furthermore, in order to ignite the pellet fuel, a tubular heating rod fixing member 302 is horizontally connected to the left side wall of the combustion chamber and directly below the feeding pipe. The heating rod (not shown in the figure) is inserted into the fixing member, with its end 402 extending into the combustion chamber. The high temperature generated by the heating rod ignites the pellet fuel fed into the combustion chamber.

[0034] Furthermore, in order to assist ventilation, ensure oxygen supply, and balance the air pressure inside and outside the combustion chamber 4, several air holes 405 are provided on the front and rear side walls of the combustion chamber 4. The oxygen supplied by the air supply mechanism enters the combustion chamber 4 through the air holes 405.

[0035] Furthermore, in order to improve the combustion efficiency of pellet fuel, a combustion plate 403 is provided inside the combustion chamber 4. The combustion plate 403 has a concave arc structure and is inclined. One end of the combustion plate 403 near the feed port 401 is fixed to the bottom plane of the combustion chamber 4 and adjacent to the end of the heating rod. The other end away from the feed port 401 is raised by a support structure to form a gap with the bottom of the combustion chamber.

[0036] Furthermore, in order to facilitate the discharge of ash, a number of ash-collecting holes 404 are evenly provided on the combustion plate 403.

[0037] The concave arc-shaped structure and inclined setting of the combustion plate 403 are crucial. First, the concave arc-shaped structure can gather the pellet fuel, thereby concentrating heat and improving heat utilization. Second, the inclined setting of the combustion plate 403, with its end away from the feed port 401 elevated by a support structure and creating a gap with the bottom of the combustion chamber, allows for sufficient airflow above and below the combustion plate. The ash collection hole 404 also serves as a vent, ensuring more complete combustion of the pellet fuel at the contact surface of the combustion plate, i.e., the bottom layer of the pellet fuel. The part of the pellet fuel at the bottom of the combustion plate that contacts the heating rod burns first, gradually burning upwards. Therefore, the bottom part will also burn into ash first, and the pellet fuel at the top of the combustion plate will slide down the combustion plate to the bottom. At the same time, the furnace ash also falls into the bottom of the combustion chamber through the ash collection hole 404. Then, new pellet fuel can be added to the top of the combustion plate, and this cycle ensures that the pellet fuel burns completely from bottom to top.

[0038] Preferably, the pellet combustion structure of the grill is installed in the lower left part of the grill chamber, and the controller 5 is installed on the grill frame for easy manual operation.

[0039] The specific implementation principle of the technical solution in this embodiment is as follows:

[0040] Pellet fuel is added through the trapezoidal opening 101 on the outer casing 1 and enters the feeding pipe 203. The controller 5 automatically adjusts the speed of the adjustable-speed motor 201 based on the set temperature and the actual temperature feedback from the temperature sensor (not shown in the figure), driving the feeding screw 202 to rotate within the feeding pipe 203, precisely pushing the pellet fuel to the feeding port 401 of the combustion chamber 4. Simultaneously, the controller 5 synchronously adjusts the speed of the adjustable-speed fan (not shown in the figure), which delivers outside air to the air vent 405 of the combustion chamber 4, providing a suitable amount of oxygen for combustion.

[0041] The fuel pellets enter the combustion chamber 4 through the feed inlet 401, fall onto the concave, curved, and inclined combustion plate 403, and trigger the heating rod (not shown in the figure) to ignite, thus initiating combustion. Oxygen supplied by the air supply mechanism 3 forms a three-dimensional oxygen supply through the air holes 405 around the combustion chamber 4, ensuring complete combustion of the fuel pellets. The ash after combustion falls through the ash collection holes 404 and the gap between the combustion plate 403 and the bottom of the combustion chamber, preventing accumulation.

[0042] We monitor the actual temperature inside the pellet oven in real time by installing a temperature sensor inside the oven. The controller, adjustable speed feeding motor, and adjustable speed fan of the precision energy-saving temperature control system are installed on one side of the pellet oven. The burner is installed inside the lower part of the pellet oven. When the user sets the target temperature inside the oven, the controller adjusts the feeding progress according to the measured current oven temperature. The pellet fuel can be automatically ignited and start heating after entering the burner for about 3 minutes. When the temperature inside the oven reaches the set temperature value, due to the effect of the precision energy-saving temperature control system, the wood pellets will be precisely fed and burned according to the PID algorithm, thereby maintaining a stable temperature inside the oven.

[0043] By coordinating and adjusting the feeding speed and oxygen supply through the controller, combined with the special structural design of the combustion chamber, the fuel combustion is effectively prevented from being too fast, too slow, or burning in a stagnant manner. Ultimately, the precise control of the grill temperature is achieved through an energy-saving and precise combustion method.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pellet combustion structure for a grill, comprising a controller, a sensor, a housing, a feeding mechanism, an air supply mechanism, and a combustion chamber, characterized in that: The feeding mechanism includes an adjustable speed motor and a feeding screw; the air supply mechanism is an adjustable speed fan; the controller is electrically connected to the adjustable speed motor and the adjustable speed fan respectively; the controller can adjust the wind speed of the adjustable speed fan to accurately supply oxygen according to the temperature value obtained by the sensor; the combustion chamber is connected to the feeding pipe of the feeding mechanism; the combustion chamber is provided with an inclined combustion plate, which has a concave arc structure and has several ventilation holes and ash collection holes.

2. The particle combustion structure of a grill according to claim 1, characterized in that: The housing is equipped with a feeding pipe inside, and the feeding screw is disposed inside the feeding pipe, with the inner diameter of the feeding pipe matching the outer diameter of the feeding screw; a motor mounting hole is provided at the left end of the housing, and the output shaft of the adjustable speed motor passes through the motor mounting hole and extends into the feeding pipe, and is fixedly connected to the feeding screw.

3. The particle combustion structure of a grill according to claim 1, characterized in that: An adjustable-speed fan mounting hole is provided at the lower end of the outer casing away from the combustion chamber, and the adjustable-speed fan is fixed in the mounting hole.

4. The particle combustion structure of a grill according to claim 1, characterized in that: The upper part of the outer casing near the adjustable speed motor has a trapezoidal opening, the lower end of which is connected to the upper left side of the feeding pipe; a mounting bracket is provided in the middle of the top of the inner wall of the outer casing, and the lower part of the mounting bracket is fixedly connected to the feeding pipe.

5. The particle combustion structure of a grill according to claim 1, characterized in that: The combustion chamber is located at the right end of the outer casing. The upper end of the combustion chamber extends through the outer casing, and several air holes are also provided on its four sides.

6. The particle combustion structure of a grill according to claim 5, characterized in that: The end of the combustion plate near the feed port is fixed to the bottom plane of the combustion chamber, while the end away from the feed port is raised by a support structure, forming a gap with the bottom of the combustion chamber.

7. The particle combustion structure of a grill according to claim 6, characterized in that: The combustion chamber also includes a heating rod fixing component, which is a tubular structure and is laterally connected to the left side wall of the combustion chamber, that is, directly below the feeding pipe.

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