Air supply structure of a particle furnace

Abstract

The application is a kind of air supply structure of pellet stove, including combustion chamber and oil receiving tray, the peripheral wall of the air duct shell of the combustion chamber is spaced apart from the peripheral wall of the combustion cup, the top end of the air duct shell is provided with air duct cover, and the top end of the combustion cup is provided with combustion cover; the side wall of the combustion cup, the air duct cover and the combustion cover are all provided with air guide hole; the spiral airflow generated by the airflow sent into the air duct shell by the air supply fan and passing through the air guide hole evenly spreads the fire and heat wave in the combustion cup to the bottom of the oil receiving tray; the left and right ends of the bottom of the oil receiving tray are oppositely provided with fire outlet, the middle of the two fire outlets is provided with fire tray, the fire outlets at the left and right ends emit fire from the edge to the center of the oil receiving tray, and the fire tray emits fire from the lower end to the upper end of the oil receiving tray, which can better realize the uniform distribution of fire and heat wave to the surface of food, the structure of spiral airflow can spread the fire and heat wave, which can fully promote the full combustion of pellet fuel in the combustion chamber, better release heat, and reduce smoke.

Description

Technical Field

[0001] This invention belongs to the field of pellet barbecue ovens, and refers to an air supply structure for a pellet oven. Background Technology

[0002] A pellet furnace is a heating device that burns pellets. It primarily uses agricultural and forestry processing waste such as sawdust, straw, rice husks, and bark as raw materials. Through pretreatment and processing, these materials are solidified into high-density pellet fuel, which is then burned for heating. Because biomass pellet fuel is a renewable resource, it contains no sulfur or phosphorus and does not produce sulfur dioxide or phosphorus pentoxide during combustion, thus preventing acid rain and air pollution. The CO2 emitted during biomass combustion is the same as the amount absorbed during photosynthesis during its growth. Therefore, from a recycling perspective, biomass combustion has zero net CO2 emissions, effectively reducing air pollutant emissions. It meets environmental monitoring emission standards, boasts high thermal efficiency, low energy consumption, and energy conservation and emission reduction, making it a new type of environmentally friendly energy product strongly promoted by the government.

[0003] Pellet grills represent a significant advancement over traditional grilling equipment. A pellet grill is a type of grill that uses burning pellets for heating. A typical pellet grill generally includes a grill body with a combustion chamber inside. A grill rack is positioned above the combustion chamber, and a feeding inlet is located on the side of the grill body. The pellets used for combustion are fed into the combustion chamber through this inlet, where they burn and generate heat, thus cooking the food placed on the grill rack. Pellet grills are more intelligent and convenient; some are controlled by a microcomputer, allowing for operation of feeding, ignition, ash removal, and temperature control via a computer module, freeing up the user's hands. Pellet grills are also very easy to install and carry, offering greater integration and making them ideal for outdoor gatherings. Furthermore, they are more economical, with lower fuel costs. Existing pellet grills can be found in patents such as CN216822961U, CN204743835U, and CN215457389U.

[0004] However, existing pellet grills still have some shortcomings or areas for improvement in their use of air ducts:

[0005] Existing pellet ovens direct the fire and heat waves directly onto the food surface, resulting in a concentrated grilling area. This causes food to scorch in the areas closest to the fire and heat while remaining uncooked at the edges, leading to wasted heat and excessive smoke. Furthermore, the energy generation mechanism of pellet ovens relies on the combustion of pellet fuel to produce heat. Therefore, for combustion to be effective, the combustible material must have sufficient contact with air to release heat and reduce smoke. Consequently, the combustion chamber requires a well-designed airflow structure to fully promote combustion.

[0006] It can be seen that the existing air supply structure of pellet furnaces is not environmentally friendly enough. Therefore, this invention will propose a solution to the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide an air supply structure for a pellet stove that better distributes fire and heat waves evenly to the food surface. The spiral airflow structure disperses the fire and heat waves, which can fully promote the combustion of pellet fuel in the combustion chamber, better release heat, and reduce smoke.

[0008] The objective of this invention is achieved as follows: A pellet furnace air supply structure includes a combustion chamber and an oil receiving tray. The combustion chamber includes an air supply fan, an air duct shell, and a combustion cup. A gap exists between the peripheral sidewall of the air duct shell and the peripheral sidewall of the combustion cup. An air duct cover is provided at the top of the air duct shell, and a combustion cover is provided at the top of the combustion cup. Air guide holes are provided on the sidewall of the combustion cup, the air duct cover, and the combustion cover. The airflow is sent into the air duct shell by the air supply fan and the spiral airflow generated by the air guide holes evenly distributes the fire and heat wave in the combustion cup to the bottom of the oil receiving tray. Fire outlets are provided at opposite ends of the bottom of the oil receiving tray, and a fire outlet plate is provided in the middle of the two fire outlets. The fire outlets at the left and right ends emit fire from the edge of the oil receiving tray towards the center, and the fire outlet plate emits fire from the bottom of the oil receiving tray towards the top.

[0009] In the above-mentioned air supply structure of the pellet furnace, the air duct shell includes a first shell and a second shell, with an air duct step formed between the two.

[0010] In the above-mentioned air supply structure of the pellet furnace, the first shell is eccentrically disposed on the second shell, and the side of the air duct step away from the air supply fan is wider than the side close to the air supply fan.

[0011] In the above-mentioned air supply structure of the pellet furnace, the air duct shell includes an air inlet shell, which is arranged on the side of the air duct shell, and the air supply fan blows the airflow into the edge of the air duct shell through the air inlet shell.

[0012] In the above-mentioned air supply structure of the pellet furnace, the combustion chamber includes a feed trough, and a ventilation hole is provided on the side wall of the feed trough, which faces the air inlet shell.

[0013] In the above-mentioned air supply structure of the pellet furnace, the feed chute is inclined from top to bottom and connected to the combustion cup.

[0014] In the air supply structure of the pellet furnace described above, the periphery of the first shell is provided with a notch corresponding to the feed chute.

[0015] In the air supply structure of the pellet furnace described above, the air duct cover includes an inner concave surface and an outer inclined surface.

[0016] In the above-mentioned air supply structure of the pellet furnace, the cover surface of the combustion cover is inclined, forming a cover opening that gradually narrows from bottom to top, and the bottom end of the concave surface of the air duct cover is located inside the cover opening.

[0017] In the air supply structure of the pellet furnace described above, the diameter of the air guide hole is wider at the top and narrower at the bottom.

[0018] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0019] The pellet oven of this invention features a more environmentally friendly and rationally designed air supply channel and oil collection tray. In existing pellet ovens, the fire and heat waves directly hit the food surface, resulting in a concentrated grilling area. This causes the food near the concentrated fire and heat waves to burn easily, while the edges remain uncooked. To better achieve a more even distribution of fire and heat waves across the food surface, a spiral airflow structure can disperse the fire and heat waves, fully promoting the combustion of pellet fuel in the combustion chamber, better releasing heat, and reducing smoke. The oil collection tray can evenly distribute the fire and heat waves onto the grill rack. Attached Figure Description

[0020] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] Figure 3 This is the second three-dimensional structural schematic diagram of the present invention.

[0023] Figure 4 This is one of the exploded structural diagrams of the present invention.

[0024] Figure 5 This is the second schematic diagram of the exploded structure of the present invention.

[0025] Figure 6 This is a top view of the combustion chamber of the present invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the combustion chamber of the present invention.

[0027] Figure 8 This is a three-dimensional structural schematic diagram of the air duct shell of the present invention.

[0028] Figure 9 This is a three-dimensional structural diagram of the combustion cup of the present invention.

[0029] Figure 10 This is a three-dimensional structural diagram of the air duct cover and combustion cover of the present invention.

[0030] Figure 11 This is a schematic diagram of the smoke exhaust duct of the present invention.

[0031] Figure 12 This is a three-dimensional structural diagram of the oil receiving tray of the present invention.

[0032] Figure 13 This is a three-dimensional structural diagram of the air duct plate of the present invention.

[0033] Figure 14 yes Figure 1 Enlarged view of point A.

[0034] The meaning of the labels in the diagram:

[0035] 1-Furnace body; 11-Blower fan; 12-Outlet fan; 13-Supporting part; 14-Supporting part; 15-Ash receiving tray;

[0036] 2-Furnace lid; 21-Handle;

[0037] 3-Combustion chamber; 31-Air duct shell; 310-Notch; 311-First shell; 312-Second shell;

[0038] 313 - Air duct step; 314 - Air inlet housing; 32 - Combustion cup; 320 - Air guide hole;

[0039] 33-Air duct cover; 331-Concave surface; 332-Outer bevel surface; 34-Combustion cover;

[0040] 341 - Cover opening; 35 - Feed chute; 351 - Vent hole;

[0041] 4-Air duct plate; 41-Exhaust outlet B; 42-Receiving step; 43-Feed chute receiving protrusion;

[0042] 5-Oil receiving tray; 51-Exhaust vent A; 52-Bent edge; 53-Adjusting plate; 54-Fire outlet;

[0043] 541-fire guide wall; 542-fire outlet protrusion; 543-fire outlet groove; 55-fire outlet plate;

[0044] 6-Grilling rack;

[0045] 7-Smoke purifier;

[0046] 8-Pellet bin; 81-Feeding agitator;

[0047] 9-Control panel;

[0048] 100 - Spiral air supply duct; 200 - Smoke exhaust duct. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments:

[0050] like Figure 1-14As shown, an air supply structure for a pellet furnace is described in the attached instruction manual. Figure 4 The pellet furnace is composed of a furnace cover 2, a baking mesh 6, an oil receiving tray 5, an air duct plate 4, a flue gas purifier 7, a pellet material box 8, a combustion chamber 3, a feeding stirring cage 81, a furnace body 1, a control panel 9, and an ash receiving tray 15.

[0051] Operating principle of the pellet furnace: The pellet furnace is operated via the control panel 9. The feeding agitator 81 controls the feeding of pellet fuel from the pellet bin 8 into the combustion chamber 3. The combustion chamber 3 has a spiral air supply channel 100, which sends the air to the oil receiving tray 5. The oil receiving tray evenly distributes the fire and heat waves to the heating mesh 6. A smoke exhaust channel 200 is formed between the oil receiving tray 5 and the air duct 4. After being cleaned and filtered by the smoke purifier 7, the smoke is discharged outside the furnace body 1. For the air supply and exhaust air flow direction, please refer to the instruction manual. Figure 1 Included with instruction manual Figure 2 As indicated by the middle arrow.

[0052] Furthermore, the spiral air supply channel 100 of the combustion chamber 3 includes a blower fan 11, an air duct shell 31, and a combustion cup 32. A gap exists between the peripheral wall of the air duct shell 31 and the peripheral wall of the combustion cup 32. Air guide holes 320 are provided on the side wall of the combustion cup 32, the air duct cover 33, and the combustion cover 34. Airflow is delivered into the air duct shell 31 by the blower fan 11 and then flows through the air guide holes 320 to generate a spiral airflow. (See the attached instruction manual for details.) Figure 5 The blower fan 11 introduces airflow from the furnace body 1. The airflow spirals from the blower fan 11 in the direction indicated by the arrow and then exits from the air duct cover 33. The spiral airflow evenly disperses the fire and heat waves to the bottom of the oil receiving tray 5 in a diffused manner.

[0053] Specifically, the air duct shell 31 of combustion chamber 3 is the outer shell of the entire combustion chamber 3. See the instruction manual for details. Figure 8 The circular air duct shell 31 includes a first shell 311 and a second shell 312, with an air duct step 313 forming between them. The air duct step 313 divides the air duct shell 31 into upper and lower layers. The air duct shell 31 also includes an air inlet shell 314, which is arranged on the side of the air duct shell 31. The air supply fan 11 blows airflow into the edge of the air duct shell 31 through the air inlet shell 314. After entering from the air inlet shell 314, the airflow enters the air duct shell 31 in a tangential direction. It first deflects in the second shell 312 of the air duct shell 31, generating a spiral. The first shell 311 is eccentrically positioned on the second shell 312. The side of the air duct step 313 away from the air supply fan 11 is wider than the side closer to the air supply fan 11. See the attached specification. Figure 6 The eccentrically positioned first housing 311 causes the channel to be of different sizes at different positions, thereby affecting the airflow speed and making it easier to produce a spiral effect.

[0054] Specifically, combustion cup 32 is the location in combustion chamber 3 used for burning particulate fuel; see the instruction manual appendix. Figure 9 The combustion cup 32 has air guide holes 320 on both the upper and lower sides of its sidewall. The air guide holes 320 are wider at the top and narrower at the bottom, which is more in line with aerodynamics and suitable for spiral airflow. After the air flows in, it is conducive to the complete combustion of the particulate fuel in the combustion cup 32, improving fuel utilization efficiency and reducing delay generation. The sidewall of the combustion cup 32 is also provided with a feed trough 35. The periphery of the first housing 311 has a notch 310 corresponding to the feed trough 35. The feeding agitator 81 pours the particulate fuel from the feed trough 35 into the combustion cup 32. The feed trough 35 is inclined from top to bottom. The purpose of the ventilation hole 351 on the sidewall of the feed trough 35 facing the air inlet housing 314 is to prevent backfire of the combustion cup 32.

[0055] Specifically, the top of the air duct shell 31 is provided with an air duct cover 33, and the top of the combustion cup 32 is provided with a combustion cover 34. The structure and assembly scheme of the air duct cover 33 and the combustion cover 34 are described in the appendix to the instruction manual. Figure 10 The duct cover 33 includes an inner concave surface 331 and an outer inclined surface 332. The cover surface of the combustion cover 34 is inclined, forming a cover opening 341 that gradually narrows from bottom to top. The bottom end of the inner concave surface 331 of the duct cover 33 is located inside the cover opening 341. The flame direction of both is described in the appendix of the instruction manual. Figure 1 Included with instruction manual Figure 2 .

[0056] Furthermore, the oil receiving tray 5 connects the spiral air supply channel 100 and the smoke exhaust channel 200. The bottom of the oil receiving tray 5 has flame outlets 54 positioned opposite each other at its left and right ends, with a flame outlet plate 55 positioned between the two flame outlets 54. The flame outlets 54 at the left and right ends emit flames from the edge of the oil receiving tray towards the center, while the flame outlet plate 55 emits flames from the bottom of the oil receiving tray towards the top. The oil receiving tray has exhaust vents A51 in all four directions on its perimeter wall. The oil fumes inside the oil receiving tray 5 are horizontally discharged from the exhaust vents A51 to the outside of the side wall. (See the attached instruction manual for details.) Figure 12 Included with instruction manual Figure 14 After the fire and heat waves from the combustion chamber 3 are evenly distributed to the bottom of the oil receiving pan 5, the fire and heat waves located on the side pass through the fire outlet 54 and then converge from both sides to the middle. The fire and heat waves located in the middle pass through the fire outlet 55 and disperse from the middle to both sides, so that the fire and heat waves are evenly distributed to the grill 6. The oil receiving pan 5 discharges the oil fumes horizontally to the outside of the oil receiving pan 5 through the slender strip-shaped exhaust port A51 on the peripheral side wall.

[0057] For details, please refer to the instruction manual appendix. Figure 14The fire outlet of the oil receiving pan 5 gathers the fire and heat waves from both sides to the middle through the arc-shaped fire guide wall 541. At the bottom of the fire outlet 55, a fire outlet protrusion 542 is formed at the fire outlet 54. A fire outlet groove 543 is formed below the fire outlet protrusion 542. The fire outlet 54 is long and narrow, with a length that is at least more than half the width of the oil receiving pan, making it easier for the fire and heat waves below the oil receiving pan 5 to flow to the fire outlet 54.

[0058] Specifically, the peripheral wall of the oil receiving tray 5 is provided with an outwardly bent edge 52, with a gap between the bent edge 52 and the peripheral wall. The bent edge 52 extends downwards at least to below the exhaust port A51. (See the attached instruction manual.) Figure 14 The bent edge 52 is formed by bending the side wall of the oil receiving tray 5 outward and downward at a 180° angle. After bending, a gap is left between the bent edge and the side wall, forming a space. This space is a major component of the exhaust duct 200. Therefore, the bent edge 52 extends downward at least to below the exhaust port A51, forming a relatively sealed space with the supporting part 13 of the furnace body 1, the surrounding side wall, and the receiving step 42 of the air duct tray 4 and the surrounding side wall. Refer to the instruction manual for the receiving step 42. Figure 13 .

[0059] Specifically, the flame plate 55 is provided with a corresponding adjustment plate 53, and the flame plate 55 and the adjustment plate 53 are provided with corresponding adjustment holes. The flame size can be adjusted by rotating the adjustment plate 53.

[0060] Furthermore, the exhaust duct (200) includes a furnace body 1, an air duct plate 4, and an oil receiving tray 5. An exhaust fan 12 is installed on the side wall of the furnace body 1. A gap is left between the side wall of the air duct plate 4 and the side wall of the oil receiving tray 5. An exhaust port A51 is provided on the oil receiving tray 5, and an exhaust port B41 is provided on the air duct plate 4. An exhaust purifier 7 is installed between the exhaust port B41 and the exhaust fan 12. (See the attached instruction manual for details.) Figure 11 The exhaust fan 12 draws out the fumes, which are then dispersed laterally from the exhaust port A51 on the oil collection tray 5, as indicated by the arrow. The gap between the side wall of the duct plate 4 and the side wall of the oil collection tray 5 forms a ring-shaped channel. Please refer to the instruction manual for details on this ring-shaped channel. Figure 14 The fumes flow in the annular channel and eventually converge at the exhaust vent B41. Exhaust vent B41 is a downward-facing opening that connects directly to the fume purifier 7. The fume purifier is a device for treating oily fumes and exhaust gases. The fume purifier itself is a conventional and mature technology in this field, and will not be described in detail here.

[0061] Specifically, the edge of the air duct plate 4 is formed with a receiving step 42, the bottom of the oil receiving plate 5 is supported by the receiving step 42, a gap is left between the bottom of the air duct plate 4 and the bottom of the oil receiving plate 5, the exhaust port B41 is set on the receiving step 42, and a support part 14 is provided on the inner side wall of the furnace body 1, which supports the bottom end of the receiving step 42.

[0062] Specifically, the bottom of the air duct plate 4 is provided with a feed trough receiving protrusion 43. See the appendix of the specification for details. Figure 13 The feed trough receiving protrusion 43 is used to place the top of the feed trough 35. Its function is to utilize part of the space inside the air duct plate 4 to install the feed trough 35, which to a certain extent simplifies the height of the entire furnace body 1 and makes the overall structure more reasonable.

[0063] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pneumatic combustion chamber air supply structure, comprising a combustion chamber (3) and an oil receiving tray (5), characterized in that: The combustion chamber (3) includes a blower fan (11), a duct shell (31), and a combustion cup (32). There is a gap between the peripheral wall of the duct shell (31) and the peripheral wall of the combustion cup (32). A duct cover (33) is provided at the top of the duct shell (31), and a combustion cover (34) is provided at the top of the combustion cup (32). Air guide holes (320) are provided on the side wall of the combustion cup (32), the duct cover (33), and the combustion cover (34). The duct shell (31) includes a first shell (311) and a second shell (312), and a duct step (313) is formed between the two. The first shell (311) is eccentrically positioned. On the second housing (312), the side of the air duct step (313) away from the air supply fan (11) is wider than the side close to the air supply fan (11); the airflow is sent into the air duct housing (31) tangentially by the air supply fan (11) and the spiral airflow generated by the air guide hole (320) evenly disperses the fire and heat wave in the combustion cup (32) to the bottom of the oil receiving tray (5); the bottom of the oil receiving tray has fire outlets (54) arranged opposite to each other on the left and right sides, and a fire outlet plate (55) is arranged in the middle of the two fire outlets (54). The fire outlets (54) at the left and right ends emit fire from the edge of the oil receiving tray to the center, and the fire outlet plate (55) emits fire from the bottom of the oil receiving tray to the top.

2. The air supply structure according to claim 1, characterized in that: The air duct housing (31) includes an air inlet housing (314) arranged on the side of the air duct housing (31), and the air supply fan (11) blows airflow into the edge of the air duct housing (31) through the air inlet housing (314).

3. The air supply structure according to claim 2, characterized in that: The combustion chamber (3) includes a feed trough (35), and a ventilation hole (351) is provided on the side wall of the feed trough (35). The ventilation hole (351) is directly opposite the air intake housing (314).

4. The air supply structure according to claim 3, characterized in that: The feed trough (35) is inclined from top to bottom and connected to the combustion cup (32).

5. The air supply structure according to claim 3, characterized in that: The first housing (311) has a notch (310) on its periphery corresponding to the feed groove (35).

6. The air supply structure according to claim 1, characterized in that: The duct cover (33) includes an inner concave surface (331) and an outer inclined surface (332).

7. The air supply structure according to claim 6, characterized in that: The combustion cover (34) has an inclined surface, forming a cover opening (341) that gradually narrows from bottom to top. The bottom end of the concave surface (331) of the air duct cover (33) is located inside the cover opening (341).

8. The air supply structure according to claim 1, characterized in that: The diameter of the air guide hole (320) is wider at the top and narrower at the bottom.

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