A pellet grill

Abstract

The present application relates to a kind of pellet oven, including furnace body, combustion chamber, fuel delivery device, first fan, flue gas circulation device and dust collection structure, the heating cavity is opened in the furnace body, and the baking tray is arranged in the heating cavity;The combustion chamber is located in the heating cavity;The fuel delivery device is used to deliver pellet fuel to the combustion chamber;The air outlet of the first fan is communicated with the air supplement port of the combustion chamber;The flue gas circulation device includes second fan and flue gas pipeline, the flue gas pipeline includes smoke inlet and smoke outlet, the smoke inlet and the smoke outlet are communicated with the heating cavity respectively, the second fan is arranged on the flue gas pipeline, and the second fan is used to drive hot flow to circulate between the heating cavity and the flue gas pipeline;The dust collection structure is arranged in the heating cavity or communicated with the flue gas pipeline, and the dust collection structure is used to collect dust in hot flow.

Description

Technical Field

[0001] This invention relates to the field of oven technology, and in particular to a pellet oven. Background Technology

[0002] A pellet oven is an outdoor cooking device that uses biomass pellets, such as wood pellets, as fuel. It typically includes an oven body, a heating chamber within the oven body, a combustion chamber within the heating chamber, and a fuel delivery system for supplying the pellet fuel to the combustion chamber. During operation, the pellet fuel burns in the combustion chamber to generate heat, which heats the food inside the heating chamber.

[0003] The existing pellet ovens have the following problems in actual use:

[0004] First, the combustion of pellet fuel produces a large amount of ash and fine dust. This dust diffuses within the heating chamber with the heat flow, easily adhering to the surface of food and affecting its hygiene and taste. Simultaneously, dust accumulates throughout the furnace interior, making cleaning difficult and resulting in a poor user experience.

[0005] Secondly, the temperature distribution within the heating chamber is uneven. The area near the combustion chamber is hotter, while the area further away is colder. This temperature gradient causes inconsistent heating of the food, affecting the stability of the cooking quality. Summary of the Invention

[0006] Therefore, it is necessary to provide a pellet oven to address the aforementioned problems.

[0007] This application provides a pellet oven, comprising:

[0008] The oven body has a heating chamber inside, and a baking tray is placed inside the heating chamber;

[0009] Combustion chamber, which is located within the heating chamber;

[0010] A fuel delivery device for delivering particulate fuel to the combustion chamber;

[0011] The first fan has its outlet connected to the air supply port of the combustion chamber.

[0012] A flue gas recirculation device includes a second fan and a flue gas duct. The flue gas duct includes a flue gas inlet and a flue gas outlet, which are respectively connected to the heating chamber. The second fan is installed on the flue gas duct and is used to drive the hot flow to circulate between the heating chamber and the flue gas duct.

[0013] A dust collection structure is provided inside the heating chamber or connected to the flue gas duct, and the dust collection structure is used to collect dust in the heat flow.

[0014] In one embodiment, the dust collection structure includes a first dust collection box disposed at the bottom of the heating chamber.

[0015] In one embodiment, the smoke outlet is located on the lower part of the side wall of the heating chamber, and the air outlet direction is towards the first dust collection box.

[0016] In one embodiment, the first dust collection box is detachably connected to the furnace body.

[0017] In one embodiment, the pellet oven further includes an oil receiving device disposed above the first dust collection box and below the baking tray, the oil receiving device being used to receive grease dripping from the baking tray and guide the grease into the first dust collection box.

[0018] In one embodiment, the oil receiving device includes an oil receiving tray and a drain pipe. The oil receiving tray is inclined and is connected to one end of the drain pipe at its lowest horizontal position. The other end of the drain pipe extends into the first dust collection box.

[0019] In some embodiments, the oil receiving tray is tilted upwards in a direction away from the smoke outlet, and the smoke outlet is at a lower level in the heating chamber than the lowest point of the oil receiving tray is at a lower level in the heating chamber.

[0020] In one embodiment, the dust collection structure further includes a second dust collection box, the smoke inlet is connected to the heating chamber through the second dust collection box, and a baffle is provided inside the second dust collection box, with multiple filter ports opened on the baffle.

[0021] In some embodiments, the smoke inlet is located on the upper part of the side wall or the top of the heating chamber.

[0022] In some embodiments, the fuel delivery device includes a hopper, a housing, a drive motor, a feed pipe, and a screw. The housing has an air guide cavity and an air inlet communicating with the air guide cavity, a first assembly port, and a second assembly port. The feed pipe is installed inside the air guide cavity.

[0023] The combustion chamber is inserted into the air guide cavity through the first assembly port. One end of the material guide pipe extends into the combustion chamber, and the other end of the material guide pipe is connected to the material box through the second assembly port. The screw is rotatably installed in the material guide pipe, and the screw is connected to the drive motor.

[0024] The first fan is installed at the air inlet.

[0025] One of the above technical solutions has the following advantages and beneficial effects:

[0026] The aforementioned pellet oven, through a flue gas circulation device including a second fan and a flue gas duct, with the inlet and outlet of the flue gas respectively connected to the heating chamber, and the second fan driving the hot flow to circulate between the heating chamber and the flue gas duct, can force the hot flow in the heating chamber to circulate convectively, thereby eliminating local temperature differences in the heating chamber and making the temperature distribution in the oven uniform; through a dust collection structure set in the heating chamber or connected to the flue gas duct, it can separate and collect the dust carried in the circulating hot flow, reducing the occurrence of dust floating in the heating chamber and keeping the food clean; this application, through the cooperation of the flue gas circulation device and the dust collection structure, can not only force the hot flow to circulate, but also collect the dust in the hot flow, thereby improving cooking efficiency and quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a pellet oven in one embodiment;

[0028] Figure 2 A cross-section of a pellet oven in one embodiment. Figure 1 ;

[0029] Figure 3 A cross-section of a pellet oven in one embodiment. Figure 2 .

[0030] The correspondence between the reference numerals and the component names is as follows:

[0031] 10 furnace body, 101 heating chambers;

[0032] 20 baking pans; 30 combustion chambers;

[0033] 40 Fuel conveying device, 41 Material box, 42 Housing, 43 Drive motor, 44 Material guide pipe, 45 Screw, 401 Air guide cavity;

[0034] 50 First Wind Turbine;

[0035] 60 Flue gas recirculation device, 61 Second fan, 62 Flue gas duct, 601 Smoke inlet, 602 Smoke outlet;

[0036] 70 Dust collection structure, 71 First dust collection box, 72 Second dust collection box, 73 Baffle;

[0037] 80 Oil receiving device, 81 Oil receiving tray, 82 Drain pipe. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0040] The following describes some embodiments of the pellet oven of the present invention with reference to the accompanying drawings.

[0041] like Figures 1 to 3 As shown, this embodiment discloses a pellet oven, including:

[0042] The oven body 10 has a heating chamber 101 inside, and a baking tray 20 is placed inside the heating chamber 101.

[0043] Combustion chamber 30 is located inside heating chamber 101;

[0044] Fuel delivery device 40, used to deliver particulate fuel to combustion chamber 30;

[0045] The first fan 50 has its air outlet connected to the air supply port of the combustion chamber 30.

[0046] The flue gas circulation device 60 includes a second fan 61 and a flue gas duct 62. The flue gas duct 62 includes a flue gas inlet 601 and a flue gas outlet 602, which are respectively connected to the heating chamber 101. The second fan 61 is installed on the flue gas duct 62 and is used to drive the hot flow to circulate between the heating chamber 101 and the flue gas duct 62.

[0047] The dust collection structure 70 is installed inside the heating chamber 101 or connected to the flue gas duct 62. The dust collection structure 70 is used to collect dust in the heat flow.

[0048] The pellet oven disclosed in this application, through a flue gas circulation device 60 including a second fan 61 and a flue gas duct 62, with the inlet 601 and outlet 602 respectively connected to the heating chamber 101, and the second fan 61 driving the heat flow to circulate between the heating chamber 101 and the flue gas duct 62, can force the heat flow in the heating chamber 101 to circulate convection, thereby eliminating local temperature differences in the heating chamber 101 and making the temperature distribution in the oven uniform; through a dust collection structure 70 set in the heating chamber 101 or connected to the flue gas duct 62, it can separate and collect the dust carried in the circulating heat flow, reducing the occurrence of dust floating in the heating chamber 101 and keeping the food clean; through the cooperation of the flue gas circulation device 60 and the dust collection structure 70, this application can not only force the heat flow to circulate, but also collect the dust in the heat flow, thereby improving cooking efficiency and quality.

[0049] The furnace body 10 can be a box structure made of metal plates welded or riveted together, and the interior of the furnace body 10 is hollow to form a heating chamber 101; in some examples, the bottom of the furnace body 10 is provided with a support column and / or pulleys.

[0050] The baking tray 20 can be used to hold food; the baking tray 20 can be a structure such as a metal mesh or a solid metal plate.

[0051] The combustion chamber 30 can be a metal cylindrical or box-shaped structure. The combustion chamber 30 can be distributed at the bottom or side of the heating chamber 101. The combustion chamber 30 can include an air supply port and an exhaust port. For example, the particulate fuel is mixed with the air supplied from the first blower 50 and burned in the combustion chamber 30 to generate high-temperature flue gas and heat, thereby heating the air in the heating chamber 101 and the food on the baking tray 20.

[0052] The first blower 50 can be used to supply air to the combustion chamber 30; specifically, the air outlet of the first blower 50 is connected to the air supply outlet of the combustion chamber 30, and the amount of oxygen delivered to the combustion chamber 30 can be controlled by adjusting the speed of the first blower 50, thereby controlling the combustion intensity.

[0053] The flue gas recirculation device 60 may include a second fan 61 and a flue gas duct 62; the flue gas duct 62 may be an independent duct separate from the outside of the furnace body 10, or it may be a duct embedded in the interlayer of the furnace body 10; the flue gas duct 62 may include a flue gas inlet 601 and a flue gas outlet 602, and the flue gas inlet 601 and the flue gas outlet 602 of the flue gas duct 62 must be connected to the heating chamber 101 of the furnace body 10; the flue gas duct 62 is also provided with an interface for installing the second fan 61;

[0054] The second fan 61 can generate negative pressure in the flue gas duct 62, extracting heat flow from the heating chamber 101 at the flue gas inlet 601, pressurizing it, and then transporting it back to the heating chamber 101 from the flue gas outlet 602, thereby forming a forced circulation of heat flow. The second fan 61 can be one of centrifugal, axial, or cross-flow type. The second fan 61 can be speed-regulated by one or a combination of fixed speed, multi-speed mechanical speed regulation, or stepless electronic speed regulation. It should be noted that by adjusting the speed of the second fan 61, the circulation speed of the heat flow between the heating chamber 101 and the flue gas duct 62 can be adjusted.

[0055] The dust collection structure 70 can be a box structure installed inside the heating chamber 101 or connected to the flue gas duct 62; the dust collection structure 70 can separate and collect the dust carried in the circulating heat flow from the airflow based on one or a combination of filtration, inertial impaction, gravity settling or centrifugal separation.

[0056] Specifically, the working principle of the pellet oven of this application is as follows: the fuel conveying device 40 sends pellet fuel into the combustion chamber 30 in the heating chamber 101, and the first fan 50 supplies air to the combustion chamber 30 to assist combustion and generate high-temperature heat flow; the second fan 61 of the flue gas circulation device 60 starts, driving the heat flow through the flue gas inlet 601 into the flue gas pipe 62, and then through the flue gas outlet 602 back to the heating chamber 101, thereby forming a heat flow circulation; during the circulation process, the heat flow passes through the dust collection structure 70, the dust in the heat flow is separated and collected, and the purified heat flow continues to circulate in the heating chamber 101.

[0057] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the dust collection structure 70 includes a first dust collection box 71, which is disposed at the bottom of the heating chamber 101.

[0058] In the pellet oven of the above embodiment, the first dust collection box 71 is set at the bottom of the heating chamber 101. Under the action of heat flow circulation, the dust in the heat flow continuously settles into the first dust collection box 71, thereby gradually purifying the dust in the heat flow and reducing the dust adhering to the food surface.

[0059] The first dust collection box 71 can be located at the bottom of the heating chamber 101 to collect dust in the heat flow. It should be noted that the opening of the first dust collection box 71 can be flush with the bottom wall of the heating chamber 101 or the opening of the first dust collection box 71 can be lower than the bottom wall of the heating chamber 101. Specifically, when the heat flow is driven by the circulation device, the dust carried in the heat flow passes through the bottom area of ​​the heating chamber 101. The dust is separated from the airflow under the action of gravity and falls into the first dust collection box 71. Since the opening of the first dust collection box 71 is flush with or lower than the bottom wall of the heating chamber 101, the collected dust is prevented from being re-rolled up by the airflow.

[0060] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the smoke outlet 602 is located on the lower part of the side wall of the heating chamber 101, and the air outlet 602 is directed towards the first dust collection box 71.

[0061] In the pellet oven of the above embodiment, the smoke outlet 602 is located on the lower part of the side wall of the heating chamber 101, which allows the circulating hot air to enter the heating chamber 101 from a position near the bottom. The hot air flowing back into the heating chamber 101 first flows through the bottom area of ​​the heating chamber 101, thereby driving the dust towards the dust collection box. Since the exhaust direction of the smoke outlet 602 is towards the opening of the first dust collection box 71, the initial velocity of the hot air at the smoke outlet 602 can be used to guide the dust to the opening of the first dust collection box, thereby using inertial force to assist the dust to fall into the first dust collection box 71.

[0062] The exhaust direction of the smoke outlet 602 can be towards the first dust collection box 71, meaning the central axis of the smoke outlet 602 is aligned with the opening area of ​​the first dust collection box 71. Since the smoke outlet 602 is located on the lower part of the side wall of the heating chamber 101, the heat flow discharged through the smoke outlet 602 is first guided to a lower area within the heating chamber 101, which helps to move the dust in the heat flow towards the first dust collection box 71, and also prevents the heat flow from blowing directly onto the first dust collection box 71 from directly above. The opening would cause the dust inside the box to be blown up and suspended.

[0063] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that the first dust collection box 71 and the furnace body 10 are detachably connected.

[0064] The pellet oven of the above embodiment has a structure in which the first dust collection box 71 is detachably connected to the oven body 10. The first dust collection box 71 can be taken out separately for cleaning, and the dust can be removed without moving or tilting the entire oven.

[0065] The first dust collection box 71 and the furnace body 10 can be detached and connected by means of plugging, snap-fit, threaded connection or locking. For example, the bottom wall of the heating chamber 101 extends away from the heating chamber 101 to form a groove. The groove is open at both ends and has a J-shaped screw notch. The inner or outer wall of the first dust collection box 71 has a protruding locking point. When the protruding locking point on the first dust collection box 71 is inserted vertically into the screw notch and extends into the heating chamber 101, the first dust collection box 71 is rotated, the protruding locking point rotates relative to the screw notch and engages with the screw notch, thereby realizing the detachable connection between the first dust collection box 71 and the furnace body 10.

[0066] like Figure 1and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further includes an oil receiving device 80, which is disposed above the first dust collection box 71 and below the baking tray 20. The oil receiving device 80 is used to receive grease dripping from the baking tray 20 and guide the grease into the first dust collection box 71.

[0067] In the pellet oven of the above embodiment, the oil receiving device 80 is set above the first dust collection box 71 and below the baking tray 20. It can guide the oil dripping during cooking to the first dust collection box 71, so that the oil and dust are collected in the same container. Furthermore, by introducing the oil into the first dust collection box 71, the viscosity of the oil can be used to help capture the dust in the heat flow. Moreover, after the oil wets the dust, it forms agglomerates or sticky surfaces, making it difficult for the dust to leave the first dust collection box 71, thereby reducing the occurrence of dust floating in the oven.

[0068] Among them, the oil receiving device 80 can be used to collect the oil dripping from the food during the cooking process in the oven and guide the oil into the first dust collection box 71; the oil receiving device 80 can be a plate structure with a guide groove or hole at the bottom and installed at an angle, a funnel structure that is wide at the top and narrow at the bottom and has an opening at the bottom, or a flat plate structure with an oil guide groove, installed at an angle and with an opening at the lowest point.

[0069] Based on the top-to-bottom distribution of the baking pan 20, the oil-collecting device 80, and the first dust collection box 71 in the heating chamber 101, the oil-collecting device 80 covers the oil-dripping area of ​​the baking pan 20 and is located above the dust collection box, so that the grease can be guided into the first dust collection box 71 by gravity. It should be noted that when the first dust collection box 71 contains grease, when the heat flow carries dust over the first dust collection box 71, most of the dust will be adsorbed by the grease due to inertial collision or diffusion.

[0070] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the oil receiving device 80 includes an oil receiving tray 81 and a drain pipe 82, the oil receiving tray 81 is inclined, and the oil receiving tray 81 is connected to one end of the drain pipe 82 at the lowest horizontal height, and the other end of the drain pipe 82 extends into the first dust collection box 71.

[0071] The oil receiving tray 81 can be used to collect the grease dripping from the grill and use the inclined surface to make the grease collect at the lowest point. Finally, the grease is guided into the first dust collection box 71 through the drainage pipe 82. The oil receiving tray 81 can be a flat or curved surface with an inclination from the high side to the low side, and the bottom of the tray can be provided with baffles on both sides to guide the grease or prevent it from overflowing. The oil receiving tray 81 can also have a V-shaped or U-shaped guide groove formed on the bottom of the tray.

[0072] like Figures 2 to 3As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the oil receiving tray 81 is inclined upward in a direction away from the smoke outlet 602, and the horizontal height of the smoke outlet 602 in the heating chamber 101 is lower than the horizontal height of the lowest point of the oil receiving tray 81 in the heating chamber 101.

[0073] In the pellet oven of the above embodiment, the oil receiving pan 81 is tilted upward in a direction away from the smoke outlet 602, and the horizontal height of the smoke outlet 602 is lower than the lowest point of the oil receiving pan 81. This causes the heat flow discharged from the smoke outlet 602 to be guided by the tilted surface when it encounters the lower surface of the oil receiving pan 81 and to flow away from the smoke outlet 602. This can prevent the heat flow from rushing upward directly or concentrating near the smoke outlet 602, so that the heat flow is evenly distributed in all areas of the heating chamber 101.

[0074] The oil receiving tray 81 is lower on the side near the smoke outlet 602 and higher on the side away from the smoke outlet 602. That is, the surface of the oil receiving tray 81 forms an inclined surface that gradually rises from the side near the smoke outlet 602 to the side away from the smoke outlet 602. This inclined surface can be a plane or a curved surface.

[0075] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the dust collection structure 70 also includes a second dust collection box 72, the smoke inlet 601 is connected to the heating chamber 101 through the second dust collection box 72, a baffle 73 is provided in the second dust collection box 72, and multiple filter ports are provided on the baffle 73.

[0076] In the pellet oven of the above embodiment, the flue gas inlet 601 is connected to the heating chamber 101 through the second dust collection box 72, and the second dust collection box 72 is provided with a baffle 73 with multiple filter ports, which can pre-remove dust before the hot flow enters the flue gas guide pipe, reduce the amount of dust entering the flue gas pipe 62 and the second fan 61, thereby protecting the second fan 61.

[0077] The second dust collection box 72, in conjunction with the baffle 73, can be used to pre-separate and collect larger diameter dust particles, thereby reducing the dust entering the second fan 61 of the flue gas duct 62. The second dust collection box 72 can be an independent box or a drawer-type structure. The second dust collection box 72 has at least two openings, one of which is connected to the heating chamber 101 and the other is connected to the flue gas inlet 601. In some examples, the opening of the second dust collection box 72 at the point of connection with the heating chamber 101 is a porous structure, and the second dust collection box 72 at the point of connection with the flue gas duct is also a porous structure.

[0078] The baffle 73 can be a flat plate structure, which can be placed perpendicular to the airflow direction or at an angle. Multiple filter ports are provided on the baffle 73. Specifically, when the hot air impacts the baffle 73, larger diameter particles are blocked by the filter ports and remain in the second dust collection box 72, while the airflow and smaller diameter particles pass smoothly through the filter ports and enter the flue gas duct 62.

[0079] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that the smoke inlet 601 is distributed on the upper part of the side wall or the top of the heating chamber 101.

[0080] The pellet oven of the above embodiment, with the smoke inlet 601 located at the top and the smoke outlet 602 located at the bottom, can form a forced convection circulation from bottom to top, effectively breaking the temperature stratification in the heating chamber 101 and making the temperature distribution of the entire heating chamber 101 more uniform.

[0081] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the fuel delivery device 40 includes a hopper 41, a housing 42, a drive motor 43, a guide pipe 44, and a screw 45. The housing 42 has an air guide cavity 401 and an air inlet, a first assembly port, and a second assembly port communicating with the air guide cavity 401. The guide pipe 44 is installed inside the air guide cavity 401.

[0082] The combustion chamber 30 is inserted into the air guide cavity 401 through the first assembly port. One end of the material guide pipe 44 extends into the combustion chamber 30, and the other end of the material guide pipe 44 is connected to the material box 41 through the second assembly port. The screw 45 is rotatably installed in the material guide pipe 44, and the screw 45 is connected to the drive motor 43.

[0083] The first fan 50 is installed at the air inlet.

[0084] In the pellet oven of the above embodiment, the combustion chamber 30 is inserted into the air guide cavity 401 of the outer shell 42 through the first assembly port. This allows the main part of the combustion chamber 30 with the air supply port to be isolated from the heating chamber 101 through the outer shell 42, preventing the heat in the heating chamber 101 from directly impacting the combustion chamber 30. This maintains the stability of pellet combustion inside the combustion chamber 30 and prevents the heat flow from directly impacting the ash inside the combustion chamber 30.

[0085] The outer shell 42 can be used as an integrated carrier to provide the air guide cavity 401, as well as the first assembly port, the second assembly port and the air inlet, and to support the combustion chamber 30, the material guide pipe 44 and the first fan 50.

[0086] The feed hopper 41 can be used to store pellet fuel. The feed hopper 41 can be a funnel-shaped container. The pellet fuel falls into the feed pipe 44 under the action of gravity. The feed pipe 44 can be used to accommodate the screw 45. When the drive motor 43 drives the screw 45 to rotate, it can transport the pellet fuel in the feed pipe 44 to the combustion chamber 30. The air guide cavity 401 can serve as a channel for air flow, guiding the air entering from the air inlet to the area around the air supply port of the combustion chamber 30. Since the air supply port is distributed on the side wall or bottom of the combustion chamber 30, when the combustion chamber 30 is inserted into the air guide cavity 401 through the first assembly port, the air in the air guide cavity 401 can enter the combustion chamber 30 through the air supply port.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A pellet baking oven, characterized in that, include: The furnace body (10) has a heating chamber (101) inside, and a baking tray (20) is provided inside the heating chamber (101). Combustion chamber (30), the combustion chamber (30) is located inside the heating chamber (101); A fuel delivery device (40) for delivering particulate fuel to the combustion chamber (30); The first fan (50) has its outlet connected to the air supply port of the combustion chamber (30); A flue gas circulation device (60) includes a second fan (61) and a flue gas duct (62). The flue gas duct (62) includes a smoke inlet (601) and a smoke outlet (602). The smoke inlet (601) and the smoke outlet (602) are respectively connected to the heating chamber (101). The second fan (61) is installed on the flue gas duct (62). The second fan (61) is used to drive the hot flow to circulate between the heating chamber (101) and the flue gas duct (62). A dust collection structure (70) is provided in the heating chamber (101) or connected to the flue gas duct (62). The dust collection structure (70) is used to collect dust in the heat flow.

2. The pellet oven according to claim 1, characterized in that, The dust collection structure (70) includes a first dust collection box (71), which is disposed at the bottom of the heating chamber (101).

3. A pellet oven according to claim 2, characterized in that, The smoke outlet (602) is located on the lower part of the side wall of the heating chamber (101), and the air outlet (602) is directed toward the first dust collection box (71).

4. A pellet oven according to claim 2, characterized in that, The first dust collection box (71) is detachably connected to the furnace body (10).

5. A pellet oven according to claim 2, characterized in that, It also includes an oil receiving device (80), which is located above the first dust collection box (71) and below the baking tray (20). The oil receiving device (80) is used to receive the oil dripping from the baking tray (20) and guide the oil into the first dust collection box (71).

6. A pellet oven according to claim 5, characterized in that, The oil receiving device (80) includes an oil receiving tray (81) and a drain pipe (82). The oil receiving tray (81) is inclined and is connected to one end of the drain pipe (82) at its lowest horizontal position. The other end of the drain pipe (82) extends into the first dust collection box (71).

7. A pellet oven according to claim 6, characterized in that, The oil receiving tray (81) is tilted upward in a direction away from the smoke outlet (602), and the smoke outlet (602) is at a lower level in the heating chamber (101) than the lowest point of the oil receiving tray (81) in the heating chamber (101).

8. A pellet oven according to claim 2, characterized in that, The dust collection structure (70) further includes a second dust collection box (72). The smoke inlet (601) is connected to the heating chamber (101) through the second dust collection box (72). A baffle (73) is provided inside the second dust collection box (72), and multiple filter ports are provided on the baffle (73).

9. A pellet oven according to claim 1, characterized in that, The smoke inlet (601) is located on the upper part of the side wall or the top of the heating chamber (101).

10. A pellet oven according to claim 1, characterized in that, The fuel delivery device (40) includes a hopper (41), a housing (42), a drive motor (43), a guide pipe (44), and a screw (45). The housing (42) has an air guide cavity (401) and an air inlet, a first assembly port, and a second assembly port communicating with the air guide cavity (401). The guide pipe (44) is installed inside the air guide cavity (401). The combustion chamber (30) is inserted into the air guide cavity (401) through the first assembly port. One end of the material guide pipe (44) extends into the combustion chamber (30), and the other end of the material guide pipe (44) is connected to the material box (41) through the second assembly port. The screw (45) is rotatably installed in the material guide pipe (44), and the screw (45) is connected to the drive motor (43) in a transmission connection. The first fan (50) is installed at the air inlet.

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