A burner for a real fire fireplace

Abstract

This invention discloses a combustion device for a real-flame fireplace. The fireplace includes a fuel bin, a feeding device, and a combustion device. The feeding device is disposed between the fuel bin and the combustion device. The combustion device includes an upward-opening combustion bowl and a partition plate disposed inside the combustion bowl, dividing the inner cavity of the combustion bowl into an upper combustion chamber and a lower air inlet chamber. One side of the upper combustion chamber has a combustion bowl inlet, and the other side opposite the combustion bowl inlet has an ash discharge port. The feeding device communicates with the combustion bowl inlet. The partition plate has several protrusions extending upwards towards the upper combustion chamber, and each protrusion has a vent. This design prevents the vents on the partition plate from being blocked by the burnt ash, allowing sufficient air to enter the upper combustion chamber, ensuring complete combustion of the biomass pellets, resulting in higher combustion efficiency and less smoke production.

Description

Technical Field

[0001] This invention relates to the field of fireplace technology, and in particular to a combustion device for a fireplace. Background Technology

[0002] Currently, most real-flame fireplaces use a heating element to ignite the biomass pellets, which involves heating the pellets with a heating rod to bring the fuel from smoldering to open flame. The biomass pellets are typically supplied via a feeding system. This feeding system is usually located above the furnace and uses a funnel-shaped hopper. The lower part of the funnel-shaped hopper is connected to the furnace via a feeding channel. During feeding, biomass pellets are poured into the funnel-shaped hopper, and under their own weight, they gradually fall into the furnace through the feeding channel for combustion.

[0003] Chinese Patent Application Publication No. CN201910099341.1, published on April 19, 2019, entitled "Two-Stage Spiral Feeding Anti-Backfire Automatic Slag Removal Combustion Device," discloses a two-stage spiral feeding anti-backfire automatic slag removal combustion device. The aim is to provide a device that can not only effectively solve the backfire problem in real-flame fireplaces but also promptly and effectively separate particulate powder generated during combustion. It includes a feed hopper; a two-stage spiral feeding device, which comprises an upper feeding cylinder, an upper feeding cylinder outlet with a downward opening on the outer surface of the upper feeding cylinder, a lower feeding cylinder located below the upper feeding cylinder, a lower feeding auger rotatably disposed within the lower feeding cylinder, a lower feeding cylinder inlet with an upward opening on the outer surface of the lower feeding cylinder, a discharge port at the output end of the lower feeding cylinder, and a discharge connecting pipe connecting the upper feeding cylinder outlet and the lower feeding cylinder inlet. The discharge port is connected to the upper feeding cylinder inlet. The self-cleaning ash combustion device includes an upward-opening combustion bowl, a fixed grate inside the combustion bowl dividing its interior into an upper combustion chamber and a lower air inlet chamber, and an ignition rod located within the lower air inlet chamber. One side of the upper combustion chamber has a combustion bowl inlet, and the other side, opposite the combustion bowl inlet, has an ash discharge port. The discharge port is connected to the combustion bowl inlet. The fixed grate extends upwards at an angle from the combustion bowl inlet towards the ash discharge port. However, in actual use, the grate gaps on the fixed grate are easily clogged by biomass pellets and the powdery ash produced after their combustion. This clogging prevents the biomass pellets from fully contacting and burning with air, resulting in reduced fuel utilization and the generation of significant smoke and carbon monoxide, which can pollute the environment and affect health. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art where the grate gap on the fixed grate is easily blocked by biomass pellets and the powder ash produced after the biomass pellets are burned, the present invention provides a combustion device for a real fire fireplace, which makes the air vents on the baffle less likely to be blocked by the powder ash produced after combustion, thereby allowing sufficient air to enter the upper combustion chamber, so that the biomass pellets can be fully burned, resulting in higher combustion efficiency and less smoke production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A combustion device for a real-flame fireplace, the real-flame fireplace including a fuel bin, a feeding device, and a combustion device, the feeding device being disposed between the fuel bin and the combustion device to deliver fuel from the fuel bin to the combustion device, the combustion device including an upward-opening combustion bowl, a partition disposed inside the combustion bowl and dividing the inner cavity of the combustion bowl into an upper combustion chamber and a lower air inlet chamber, a combustion bowl inlet on one side of the upper combustion chamber, and an ash discharge port on the other side of the upper combustion chamber opposite to the combustion bowl inlet, the feeding device communicating with the combustion bowl inlet, and the partition having a plurality of protrusions protruding towards the upper combustion chamber, the protrusions having vents.

[0007] In the above technical solution, the fuel is biomass pellets. The discharge port of the feed hopper is connected to one end of the feeding device, and the other end of the feeding device is connected to the inlet of the combustion bowl. The biomass pellets enter the feeding device through the discharge port of the feed hopper, and are then conveyed to the inlet of the combustion bowl. From there, they are transported to the baffle plate in the upper combustion chamber for combustion. As the biomass pellets gradually turn into powdered ash after high-temperature combustion on the baffle plate, the feeding device continuously pushes the biomass pellets onto the baffle plate in the upper combustion chamber, gradually pushing them towards the ash discharge port. The biomass pellets closest to the ash discharge port burn for the longest time and are completely burned into powdered ash, which falls from the ash discharge port. While the biomass pellets move on the baffle plate, the vent allows air from the lower air intake chamber to enter the upper combustion chamber, providing the oxygen required for combustion. Because the protrusions extend upwards towards the upper combustion chamber, during the movement of the biomass pellets, the pellets are either lifted by the protrusions or bypassed from both sides. The lifted or bypassed pellets have a stirring effect, allowing the areas where the pellets were originally compressed to come into contact with air, resulting in more complete combustion. Furthermore, because the protrusions extend upwards, the height of the protrusions and the vents on them is higher than the areas of the partition without protrusions. This makes it less prone to ash accumulation on the protrusions, and the vents are less likely to be blocked by ash residue. Even if ash residue does block the vents, the friction between the protrusions and the upper surface of the pellets when they are lifted removes the ash residue, keeping the vents clear. This ensures sufficient air enters the upper combustion chamber, allowing for more complete combustion of the biomass pellets, higher combustion efficiency, and less smoke production. In areas of the partition without protrusions, a flat surface can be provided, facilitating the passage of biomass pellets and ash residue generated after combustion.

[0008] Preferably, the vent includes two cross-shaped gaps.

[0009] In the above technical solution, the structure can reduce the width of the air vent while ensuring the ventilation area, preventing unburned and small biomass particles from slipping out of the air vent, and the cross-shaped gap can increase the coverage of the air vent, allowing more biomass particles to fully contact the air.

[0010] Preferably, the protrusions and vents on the partition are integrally stamped structures.

[0011] In the above technical solution, the processing cost of the partition can be reduced. When the vent is a cross-shaped gap, a groove structure adapted to the protrusion can be provided on the lower die, and a protrusion structure adapted to the protrusion can be provided on the upper die. A protruding cutter for cutting the protrusion is provided on the protrusion structure, and the shape of the cutter matches the shape of the vent. During the stamping process, the cutter first contacts the partition, pressing and cutting a cross groove on the partition. Then, the protrusion structure and the groove structure press the partition together to form a protrusion with a cross-shaped vent. No excess waste is generated during the stamping process, eliminating the need for waste discharge.

[0012] Preferably, the protrusion height of the protrusion decreases from the combustion bowl inlet side to the ash discharge port side. The biomass pellets near the combustion bowl inlet side are larger in size, while those near the ash discharge port side are smaller in size. This structure allows the biomass pellets near the ash discharge port side to also be lifted by the protrusion, achieving the effect of removing accumulated ash and increasing the air contact area.

[0013] Preferably, the fuel inside the hopper is cylindrical, with the distance between two adjacent protrusions less than the length of the cylinder, and the height of the protrusion greater than one-quarter of the cylinder's diameter and less than the cylinder's radius. In this technical solution, the height of the protrusion being greater than one-quarter of the cylinder's diameter increases the mixing effect, while being less than the cylinder's radius ensures that the fuel can pass through the protrusion. Furthermore, the height of the protrusion should not be too high to avoid affecting the ventilation effect of the fuel at the bottom.

[0014] Preferably, the baffle extends upwards at an angle from the combustion bowl inlet toward the ash discharge port. This design can reduce the risk of backfire.

[0015] Preferably, the inclination angle of the baffle increases from the combustion bowl inlet side to the ash discharge port side, with a maximum inclination angle of less than 30°. On the inclined baffle, larger biomass particles fall back more easily. This design allows larger biomass particles to fall back to the combustion bowl inlet side for more complete combustion. The fully combusted powder ash has greater friction with each other, making it easier to pass through the inclined baffle and be discharged into the upper combustion chamber through the ash discharge port. Furthermore, the increasing inclination angle from the combustion bowl inlet side to the ash discharge port allows unburned biomass particles near the ash discharge port to also fall back, reducing the amount of unburned biomass particles entering the ash discharge port and increasing fuel utilization. A maximum inclination angle of less than 30° prevents fully combusted powder ash from slipping off.

[0016] Preferably, the baffle is provided with an elongated hole near the combustion bowl inlet, the length of which is perpendicular to the direction of fuel movement within the upper combustion chamber. Due to the inclined design of the baffle, some fully combusted powder will inevitably accumulate on the combustion bowl inlet side during operation; the elongated hole can discharge this accumulated powder.

[0017] Preferably, the sidewall of the elongated hole near the inlet of the combustion bowl protrudes upwards and the height of the protrusion is less than the radius of the fuel, so that the elongated hole faces the ash discharge port.

[0018] In the above technical solution, since the elongated hole faces the ash discharge port and the protrusion height is less than the radius of the cylinder, under the pushing action of the feeding device, the biomass pellets can smoothly pass through the elongated hole and move towards the ash discharge port. During the movement of the biomass pellets, the sidewall of the elongated hole protrudes upward, which will inevitably cause the baffle to vibrate slightly, shaking the powder ash accumulated on the inlet side of the combustion bowl into the elongated hole and discharging it.

[0019] Preferably, the lower air inlet chamber is provided with an ash collection box, the lower air inlet chamber is connected to the ash collection box, and the ash discharge port is connected to the ash collection box. The ash collection box can collect the ash produced by combustion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the real fire fireplace in this invention;

[0021] Figure 2 This is a schematic diagram of the combustion device in this invention;

[0022] Figure 3 This is a schematic diagram of the partition structure in this invention;

[0023] Figure 4 This is a partial cross-sectional view of the partition in this invention. Figure 1 ;

[0024] Figure 5 This is a partial cross-sectional view of the partition in this invention. Figure 2 ;

[0025] Figure 6 This is a partially enlarged view of the partition in this invention.

[0026] In the diagram: 1. Material bin; 2. Feeding device; 3. Combustion device; 3.1. Combustion bowl; 3.2. Upper combustion chamber; 3.3. Lower air inlet chamber; 3.4. Baffle plate; 3.5. Ash discharge port; 3.6. Protrusion; 3.7. Ventilation port; 3.8. Long strip hole; 3.9. Combustion bowl inlet; 4. Ash collection box. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] Example 1:

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a combustion device 3 for a real-flame fireplace includes a fuel bin 1, a feeding device 2, and a combustion device 3. The feeding device 2 is disposed between the fuel bin 1 and the combustion device 3 to deliver fuel from the fuel bin 1 to the combustion device 3. The combustion device 3 includes an upward-opening combustion bowl 3.1 and a partition 3.4 disposed inside the combustion bowl 3.1 and dividing the inner cavity of the combustion bowl 3.1 into an upper combustion chamber 3.2 and a lower air inlet chamber 3.3. One side of the upper combustion chamber 3.2 is provided with a combustion bowl inlet 3.9, and the other side of the upper combustion chamber 3.2 opposite to the combustion bowl inlet 3.9 is provided with an ash discharge port 3.5. The feeding device 2 communicates with the combustion bowl inlet 3.9. The partition 3.4 is provided with a plurality of protrusions 3.6 protruding upward toward the upper combustion chamber 3.2, and the protrusions 3.6 are provided with vents 3.7.

[0030] In the above technical solution, the lower part of the feed bin 1 is funnel-shaped, and a discharge port is provided at the bottom of the feed bin 1. An ignition rod for ignition is provided inside the lower air inlet chamber 3.3. The lower air inlet chamber 3.3 is connected to the outside of the real fire fireplace through an air inlet structure, allowing a continuous supply of fresh air. The fuel is biomass pellets. The discharge port of the feed bin 1 is connected to one end of the feeding device 2, and the other end of the feeding device 2 is connected to the combustion bowl inlet 3.9. Biomass pellets enter the feeding device 2 through the discharge port of the feed hopper 1. The feeding device 2 then transports the biomass pellets to the combustion bowl inlet 3.9, and from there to the baffle 3.4 within the upper combustion chamber 3.2 for combustion. As the biomass pellets undergo high-temperature combustion on the baffle 3.4, gradually turning into powdered ash, the feeding device 2 continuously pushes the biomass pellets onto the baffle 3.4 within the upper combustion chamber 3.2. This gradually pushes the biomass pellets on the baffle 3.4 towards the ash discharge port 3.5. The biomass pellets closest to the ash discharge port 3.5 burn for the longest time and are completely burned into powdered ash, which falls from the ash discharge port 3.5. While the biomass pellets move on the baffle 3.4, the vent 3.7 allows air from the lower air inlet chamber 3.3 to enter the upper combustion chamber 3.2, providing the oxygen required for combustion. Because the protrusion 3.6 protrudes upwards towards the upper combustion chamber 3.2, during the movement of the biomass pellets, the pellets are either lifted by the protrusion 3.6 or pass around it from both sides. The lifted or passed-around biomass pellets have a stirring effect, allowing the areas where the pellets were originally compressed to come into contact with air, resulting in more complete combustion. Furthermore, because the protrusion 3.6 protrudes upwards, the height of the protrusion 3.6 and the vent 3.7 located on the protrusion 3.6 is higher than the position of the partition 3.4 where the protrusion 3.6 is not located. It is easy to accumulate ash, and the vent 3.7 is not easily blocked by the powdery ash after combustion. Even if the powdery ash blocks the vent 3.7, when the biomass pellets are pushed up by the protrusion 3.6, they will rub against the upper surface of the protrusion 3.6, thereby carrying away the powdery ash on the upper surface of the protrusion 3.6, keeping the vent 3.7 unobstructed. This allows sufficient air to enter the upper combustion chamber 3.2, enabling the biomass pellets to burn completely, resulting in higher combustion efficiency and less smoke production. In the position where the protrusion 3.6 is not set on the partition 3.4, a flat surface can be set to facilitate the passage of biomass pellets and the powdery ash produced after combustion.

[0031] The lower air inlet chamber 3.3 is equipped with an ash collection box 4 at its lower part. The lower air inlet chamber 3.3 is connected to the ash collection box 4, and the ash discharge port 3.5 is connected to the ash collection box 4. The ash collection box 4 can collect the ash produced by combustion.

[0032] Preferred, such as Figure 2 and Figure 6As shown, the vent 3.7 includes two intersecting gaps. The protrusion 3.6 on the partition 3.4 and the vent 3.7 are integrally stamped structures.

[0033] In the above technical solution, the structure can reduce the width of the vent 3.7 while ensuring the ventilation area, preventing unburned and small particles from slipping out of the vent 3.7. The cross-shaped gaps can increase the coverage of the vent 3.7, allowing more biomass particles to fully contact the air. The integrated stamping structure can reduce the processing cost of the partition 3.4. When the vent 3.7 has two cross-shaped gaps, a groove structure adapted to the protrusion 3.6 can be provided on the lower stamping die, and a protrusion structure adapted to the protrusion 3.6 can be provided on the upper die. A protruding cutter for cutting the protrusion 3.6 is provided on the protrusion structure, and the shape of the cutter is adapted to the shape of the vent 3.7. During the stamping process, the cutter first contacts the partition 3.4, pressing and cutting a cross groove on the partition 3.4. Then, the protrusion structure and the groove structure press the partition 3.4 together to form the protrusion 3.6 with the cross-shaped vent 3.7. No excess waste is generated during the above stamping process, and there is no need to perform waste discharge operations.

[0034] Preferably, the protrusion height of the protrusion 3.6 decreases from the combustion bowl inlet 3.9 side to the ash discharge port 3.5 side. The biomass pellets near the combustion bowl inlet 3.9 are larger in size, while those near the ash discharge port 3.5 are smaller. This structure allows the biomass pellets near the ash discharge port 3.5 to also be lifted by the protrusion 3.6, achieving the effect of removing accumulated ash and increasing the air contact area.

[0035] Preferably, the fuel in the feed hopper 1 is cylindrical, the distance between two adjacent protrusions 3.6 is less than the length of the cylinder, and the height of the protrusion 3.6 is greater than one-quarter of the cylinder's diameter and less than the cylinder's radius. In the above technical solution, the height of the protrusion 3.6 being greater than one-quarter of the cylinder's diameter can increase the stirring effect, and being less than the cylinder's radius ensures that the fuel can pass through the protrusion 3.6. Furthermore, the height of the protrusion 3.6 should not be too high to avoid affecting the ventilation effect of the fuel at the bottom.

[0036] Preferred, such as Figure 2 As shown, the baffle 3.4 extends upwards from the combustion bowl inlet 3.9 toward the ash discharge port 3.5. This design can reduce the risk of backfire.

[0037] Preferably, the inclination angle of the baffle 3.4 increases from the combustion bowl inlet 3.9 side towards the ash discharge port 3.5 side, with a maximum inclination angle of less than 30°. On the inclined baffle 3.4, larger biomass particles fall back more easily. This design allows larger biomass particles to fall back to the combustion bowl inlet 3.9 side for complete combustion. The fully combusted powder ash has greater friction with each other, making it easier to pass through the inclined baffle 3.4 and be discharged into the upper combustion chamber 3.2 through the ash discharge port 3.5. Furthermore, the increasing inclination angle of the baffle 3.4 from the combustion bowl inlet 3.9 side towards the ash discharge port 3.5 allows unburned biomass particles near the ash discharge port 3.5 to also fall back, reducing the amount of unburned biomass particles entering the ash discharge port 3.5 and increasing fuel utilization. A maximum inclination angle of less than 30° prevents the fully combusted powder ash from slipping off.

[0038] Preferred, such as Figure 3 and Figure 4 As shown, the baffle 3.4 has an elongated hole 3.8 near the combustion bowl inlet 3.9. The length of the elongated hole 3.8 is perpendicular to the direction of fuel movement within the upper combustion chamber 3.2. Due to the inclined arrangement of the baffle 3.4, some fully combusted powder will inevitably accumulate on one side of the combustion bowl inlet 3.9 during use. The elongated hole 3.8 can discharge the powder accumulated on one side of the combustion bowl inlet 3.9. The width of the elongated hole 3.8 is smaller than the diameter of the biomass pellet.

[0039] Preferably, the sidewall of the elongated hole 3.8 near the combustion bowl inlet 3.9 protrudes upward and the protrusion height is less than the radius of the cylinder, so that the elongated hole 3.8 faces the ash discharge port 3.5.

[0040] In the above technical solution, since the elongated hole 3.8 faces the ash discharge port 3.5 and the protrusion height is less than the radius of the cylinder, under the pushing action of the feeding device 2, the biomass pellets can smoothly pass through the elongated hole 3.8 and move towards the ash discharge port 3.5. During the movement of the biomass pellets, since the side wall of the elongated hole 3.8 protrudes upward, the baffle 3.4 will inevitably produce slight vibrations, which will shake the powder ash accumulated on the side of the combustion bowl inlet 3.9 into the elongated hole 3.8 and discharge it.

[0041] The combustion device also includes an air intake structure. The air intake structure and the feeding device can adopt the structure described in the patent application document with application number 2019100993411, or other similar structures. This improves the overall structural compactness.

Claims

1. A combustion device for a real-flame fireplace, the real-flame fireplace comprising a fuel bin, a feeding device, and a combustion device, wherein the feeding device is disposed between the fuel bin and the combustion device to deliver fuel from the fuel bin to the combustion device, characterized in that, The combustion device includes an upward-opening combustion bowl, a partition plate disposed inside the combustion bowl and dividing the inner cavity of the combustion bowl into an upper combustion chamber and a lower air inlet chamber, a combustion bowl inlet on one side of the upper combustion chamber, an ash discharge port on the other side of the upper combustion chamber opposite to the combustion bowl inlet, a feeding device communicating with the combustion bowl inlet, and a plurality of protrusions protruding upward toward the upper combustion chamber on the partition plate, and air vents on the protrusions; The baffle plate extends upwards at an angle from the combustion bowl inlet toward the ash discharge port; the baffle plate has an elongated hole near the combustion bowl inlet, the length of which is perpendicular to the direction of fuel movement in the upper combustion chamber; the side wall of the elongated hole near the combustion bowl inlet protrudes upwards, and the height of the protrusion is less than the radius of the fuel, so that the elongated hole faces the ash discharge port; the lower part of the lower air inlet chamber is provided with an ash collection box, the lower air inlet chamber is connected to the ash collection box, and the ash discharge port is connected to the ash collection box.

2. The combustion device for a real-flame fireplace according to claim 1, characterized in that, The vent includes two cross-shaped gaps.

3. A combustion device for a real-flame fireplace according to claim 1 or 2, characterized in that, The protrusions and vents on the partition are integrally stamped structures.

4. A combustion device for a real-flame fireplace according to claim 1, characterized in that, The protrusion height of the protrusion decreases from the inlet side of the combustion bowl towards the ash discharge port side.

5. A combustion device for a real-flame fireplace according to claim 4, characterized in that, The fuel inside the hopper is cylindrical in shape. The distance between two adjacent protrusions is less than the length of the cylinder. The height of the protrusion is greater than one-quarter of the cylinder's diameter and less than the cylinder's radius.

6. A combustion device for a real-flame fireplace according to claim 1, characterized in that, The inclination angle of the baffle increases from the combustion bowl inlet side to the ash discharge outlet side, and the maximum inclination angle is less than 30°.

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