A new type of pellet burning fireplace

Abstract

A new pellet combustion fireplace includes a fireplace shell and a combustion chamber formed in the fireplace shell, the combustion chamber is provided with a combustion box and an air inlet pipe for oxygen supply at the lower part of the combustion box, the fireplace shell is provided with a glass door which can be opened and closed at the front side of the combustion chamber, the fireplace shell is also provided with a feeding device, an ignition device, an air supply device and an air exhaust device, the air exhaust pipe of the air exhaust device is built in the air supply duct of the air supply device to realize sufficient gas heat exchange, the fireplace shell is provided with a drawer box at the lower part of the combustion chamber, the opening degree of the drawer box is adjusted by manual sliding to change the oxygen supply condition of the combustion chamber, the connection end of the air exhaust pipe away from the negative pressure fan is connected with the combustion chamber through a counter-flow type sleeve, the counter-flow type sleeve is provided with a high thermal conductivity microcrystalline glass at the top, and the microcrystalline glass is arranged protruding from the surface of the fireplace shell; the combustion fireplace is further improved in functionality, and the oxygen supply amount can also be adjusted by sliding the drawer box.

Description

Technical Field

[0001] This utility model relates to a novel pellet combustion fireplace. Background Technology

[0002] Pellet fireplaces are a type of air-heated device that uses agricultural crops such as wheat straw as raw materials to form pellet fuel through a pelleting process, and then puts the pellet fuel into the combustion chamber for combustion and supplies hot air. Pellet fireplaces are more commonly used in northern my country because agricultural pellet fuel is more readily available in the north. Publication number CN218864225U, entitled "A Pellet Fireplace", is an example of an existing pellet fireplace.

[0003] Existing pellet fireplaces typically only have a forced-air heating function. However, in actual use, people often want them to also be able to brew tea or heat other pots and pans. In addition, the interior of the fireplace is connected to the outside air via an air inlet pipe located below the combustion chamber. When the pellet fuel burns in the combustion chamber, it produces viscous drips that fall onto the inlet of the air inlet and form a viscous substance. This can cause partial blockage of the air inlet, affecting the oxygen supply to the fireplace. In other words, after a certain period of use, the pellet fireplace may experience incomplete combustion of the pellet fuel in the combustion chamber due to insufficient oxygen supply, resulting in fuel waste and the production of toxic gases such as carbon monoxide. Utility Model Content

[0004] To address the shortcomings mentioned above, this utility model provides a new type of pellet combustion fireplace.

[0005] To achieve the above objectives, this utility model provides a novel pellet-fired fireplace, comprising a fireplace shell and a combustion chamber formed within the fireplace shell. A combustion box is disposed within the combustion chamber, and an air inlet pipe communicating with ambient air to supply oxygen is provided at the lower part of the combustion box. The fireplace shell has an openable glass door on the front side of the combustion chamber. The fireplace shell also includes a fuel supply device, an ignition device, an air supply device, and an exhaust device. The fuel supply device is used to controllably deliver fuel to the combustion box. The ignition device is an igniter located near the combustion box. The air supply device includes a blower and an air duct. The air inlet of the air duct communicates with ambient air via the blower, and the air outlet of the air duct connects to the air supply outlet of the fireplace shell. At the grille, the exhaust device includes a negative pressure fan and an exhaust duct. The air inlet of the exhaust duct is connected to the combustion chamber, and the air outlet of the exhaust duct is connected to the ambient air via the negative pressure fan. Simultaneously, the exhaust duct is built into the air supply duct to achieve sufficient gas heat exchange. The fireplace shell has a sliding drawer box at the lower part of the combustion chamber. The drawer box can be manually slid to adjust its opening degree, thereby changing the oxygen supply to the combustion chamber to ensure complete fuel combustion. The exhaust duct's connection end away from the negative pressure fan is connected to the combustion chamber via a counter-flow sleeve. The counter-flow sleeve has a highly thermally conductive microcrystalline glass at its top, which protrudes from the surface of the fireplace shell for placing heating vessels.

[0006] Furthermore, the counter-flow sleeve includes an inner tube and an outer tube sleeved outside the inner tube. The lower part of the inner tube is directly connected to the combustion chamber. The height of the outer tube is higher than that of the inner tube, and a flow channel for gas flow is formed between the outer tube and the inner tube. The microcrystalline glass is disposed on the outer tube.

[0007] Furthermore, the feeding device includes a feeding hopper, a first pushing unit and a second pushing unit in a Z-shape. The feeding hopper is fixed inside the fireplace housing. The outlet of the feeding hopper is connected to the inlet of the first pushing unit. The outlet of the first pushing unit is connected to the inlet of the second pushing unit. The outlet of the second pushing unit is connected to the combustion chamber.

[0008] Furthermore, the first feeding unit includes a first feeding pipe and a first auger blade driven by a first motor built into the first feeding pipe; the second feeding unit includes a second feeding pipe and a second auger blade driven by a second motor built into the second feeding pipe; and the fireplace shell is provided with a movable flip cover at a position corresponding to the feeding hopper.

[0009] Furthermore, a controller is also provided inside the fireplace housing. The first motor, the second motor, the igniter, the blower, and the negative pressure fan are all electrically connected to the controller to achieve unified control.

[0010] Furthermore, the fireplace housing has a quick-release back panel on the back and openable side panels on both sides. One side of the side panel is hinged to the fireplace housing via a hinge, and the other side of the side panel is connected to the fireplace housing via a magnetic structure.

[0011] Furthermore, the fireplace shell is provided with observation windows on both sides of the combustion chamber. The observation windows are made of high-temperature resistant glass, and the two observation windows together with the glass door form a three-sided enclosure structure.

[0012] Furthermore, the fireplace housing is also equipped with an ash storage box, which is located below the combustion box to collect combustion ash. Both the ash storage box and the combustion box can be quickly detached and installed on the inner wall of the combustion chamber by means of hooks, so as to facilitate opening the glass door for quick cleaning.

[0013] The advantages of this utility model over the prior art are as follows:

[0014] 1. The fireplace casing has a sliding drawer box at the bottom of the combustion chamber. The opening degree of the drawer box can be adjusted by manually sliding it to compensate for insufficient oxygen supply caused by the caking of the air intake pipe, so as to ensure that the fuel is in an oxygen-rich state and burns completely.

[0015] 2. The counter-flow sleeve is equipped with a highly thermally conductive microcrystalline glass at the top. The microcrystalline glass protrudes from the surface of the fireplace housing for placing heating vessels. The fireplace can be used to boil water and brew tea, further improving its functionality. Attached Figure Description

[0016] Figure 1 For a new type of three-dimensional pellet combustion fireplace Figure 1 ;

[0017] Figure 2 For a new type of three-dimensional pellet combustion fireplace Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the internal structure of the combustion chamber of a novel pellet-burning fireplace.

[0019] Figure 4 This is a schematic diagram of the internal installation of a new type of pellet combustion fireplace.

[0020] Figure 5 This is a cross-sectional view of a novel pellet-burning fireplace.

[0021] Figure 6 for Figure 5 Enlarged view of the feeding device in the middle;

[0022] Figure 7 This is a schematic diagram of the gas flow direction of the exhaust system.

[0023] In the diagram: 1. Fireplace casing; 2. Glass door; 3. Observation window; 4. Side panel; 5. Quick-release back panel; 6. Microcrystalline glass; 7. Flip-top cover; 8. Air supply grille; 9. Combustion chamber; 10. Combustion box; 11. Drawer box; 12. Air inlet pipe; 13. Ignition device; 14. Air supply fan; 15. Air supply duct; 16. Negative pressure fan; 17. Exhaust duct; 18. Counterflow sleeve; 19. Feed hopper; 20. First motor; 21. First feed pipe; 22. First auger blade; 23. Second motor; 24. Second feed pipe; 25. Second auger blade; 26. Controller. Detailed Implementation

[0024] like Figures 1-7As shown, a novel pellet-fired fireplace according to an embodiment of this utility model includes a fireplace shell 1 and a substantially sealed combustion chamber 9 formed within the fireplace shell 1. A combustion box 10 is provided within the combustion chamber 9, and an air inlet pipe 12, communicating with ambient air to supply oxygen, is provided at the lower part of the combustion box 10. The air inlet pipe 12 extends horizontally from the outside of the fireplace shell 1 into the combustion chamber 9 and serves as the primary oxygen supply. An openable glass door 2 is provided on the front side of the combustion chamber 9 within the fireplace shell 1. The fireplace shell 1 also includes a fuel supply device, an ignition device, an air supply device, and an exhaust device. The fuel supply device is used to controllably deliver fuel to the combustion box 10. The ignition device is an igniter 13 located near the combustion box 10. The air supply device includes a blower 1. 4. The air supply duct 15 has an air inlet connected to the ambient air via the air supply fan 14, and an air outlet connected to the air supply grille 8 of the fireplace housing 1. The exhaust system includes a negative pressure fan 16 and an exhaust pipe 17. The air inlet of the exhaust pipe 17 is connected to the combustion chamber 9, and the air outlet of the exhaust pipe 17 is connected to the ambient air via the negative pressure fan 16. The exhaust pipe 17 is integrated within the air supply duct 15 to achieve sufficient gas heat exchange. The fireplace housing 1 has a sliding drawer box 11 at the bottom of the combustion chamber 9. The drawer box 11 can be manually slid open to adjust the oxygen supply to the combustion chamber 9 to ensure complete fuel combustion. The exhaust pipe 17 is connected away from the negative pressure fan 16 via... A counter-flow sleeve 18 is connected to the combustion chamber 9. A highly thermally conductive microcrystalline glass 6 is disposed at the top of the counter-flow sleeve 18, protruding from the surface of the fireplace housing 1 for placing the heating element. The counter-flow sleeve 18 includes an inner tube and an outer tube sleeved around the inner tube. The lower part of the inner tube is directly connected to the combustion chamber 9. The height of the outer tube is higher than the inner tube, forming a flow channel for gas flow. The microcrystalline glass 6 is disposed on the outer tube. The airflow flows directly upwards in the inner tube and directly downwards in the flow channel formed between the outer and inner tubes, exchanging heat with the microcrystalline glass 6 during the counter-flow reversal process. The feeding device includes a feed hopper 19, a Z-shaped first pushing unit, and a second pushing unit. The T-shaped design can better prevent backfire. The feed hopper 19 is fixed inside the fireplace housing 1. The outlet of the feed hopper 19 is connected to the inlet of the first pusher unit. The outlet of the first pusher unit is connected to the inlet of the second pusher unit. The outlet of the second pusher unit is connected to the combustion box 10. The first pusher unit includes a first feeding pipe 21 and a first auger blade 22 driven by a first motor 20 and built into the first feeding pipe 21. The second pusher unit includes a second feeding pipe 24 and a second auger blade 25 driven by a second motor 23 and built into the second feeding pipe 24. The fireplace housing 1 is provided with a movable flip cover 7 at the corresponding position of the feed hopper 19. Opening the movable flip cover 7 can add pellet fuel to the feed hopper 19.The fireplace housing 1 is also equipped with a controller 26. The first motor 20, the second motor 23, the igniter 13, the blower 14, and the negative pressure fan 16 are all electrically connected to the controller 26 for unified PLC control. The back of the fireplace housing 1 has a quick-release back panel 5, and both sides of the fireplace housing 1 have openable side panels 4. One side of the side panel 4 is hinged to the fireplace housing 1, and the other side is magnetically attached. The quick-release back panel 5 and the side panels 4 are designed for easy inspection and maintenance. The fireplace housing 1 has observation windows 3 on both sides of the combustion chamber 9. The observation windows 3 are made of high-temperature resistant glass, and the two observation windows 3, together with the glass door 2, form a three-sided enclosure. The fireplace housing 1 also has an ash collection box located below the combustion box 10 for collecting combustion ash. Both the ash collection box and the combustion box 10 are quickly detached from the inner wall of the combustion chamber 9 via hooks, allowing for easy opening of the glass door 2 for rapid cleaning.

[0025] The fireplace casing has a sliding drawer box at the bottom of the combustion chamber. The drawer box can be manually slid to adjust its opening, thereby compensating for insufficient oxygen supply caused by the caking of the air intake pipe, so as to ensure that the fuel is in an oxygen-rich state and burns completely. The counterflow sleeve is equipped with a high thermal conductivity microcrystalline glass at the top. The microcrystalline glass is set on the surface of the fireplace casing for placing heating vessels. The fireplace can be used to boil water and brew tea, further improving its functionality.

[0026] In practical use, for ease of understanding of this utility model, it will be described in conjunction with the accompanying drawings;

[0027] The feeding device, controlled by controller 26, supplies pellet fuel (or powdered fuel) to combustion chamber 10 according to a set mode. Ignition is achieved by igniter 13, causing the pellet fuel to burn and generating a large amount of high-temperature gas in combustion chamber 9. Controller 26 controls negative pressure fan 16 to operate, causing the high-temperature gas to pass sequentially through counter-flow sleeve 18 and exhaust duct 17, and settle in the settling chamber at the bottom of combustion chamber 9 before being extracted by negative pressure fan 16. Because combustion chamber 9 generates a certain degree of vacuum, ambient air enters through air inlet duct 12 to replenish the air in combustion chamber 9. Ventilation holes are provided at the bottom of combustion chamber 10, allowing air inlet duct 12 located at the bottom of combustion chamber 10 to better participate in airflow circulation and ensure that the pellet fuel is always fully combusted in an oxygen-rich state. A schematic diagram of this airflow circulation can be found in [reference needed]. Figure 7 .

[0028] After prolonged use, it is inevitable that glue will form at the inlet of the air inlet 12. In this case, the drawer box 11 can be manually pulled outwards to make it an auxiliary air intake channel to ensure sufficient oxygen supply in the combustion chamber 9. Alternatively, an exhaust gas detector can be installed at the exhaust end of the negative pressure fan 16. When incomplete combustion is detected, an audible and visual alarm will be activated to remind the user to adjust the position of the drawer box 11 or to stop the machine to clean the inlet of the air inlet 12.

[0029] When tea needs to be brewed, the kettle is placed directly on the top of the microcrystalline glass 6. The high-temperature gas in the combustion chamber 9 will transfer heat through the microcrystalline glass 6. According to actual tests, 2000ml of water can be boiled in 5-10 minutes. The flow direction of the high-temperature gas inside the exhaust duct 17 is different from that of the gas in the air supply duct 15, and the two parts of the gas will have sufficient heat exchange through the pipe wall of the exhaust duct 17. According to actual tests, the gas at the tail end of the negative pressure fan 16 is close to room temperature, while the temperature at the air supply grille 8 is between 40 and 50 degrees Celsius, realizing the function of air heating.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel pellet-fired fireplace, comprising a fireplace housing (1) and a combustion chamber (9) formed within the fireplace housing (1), wherein a combustion box (10) is provided within the combustion chamber (9) and an air inlet pipe (12) is provided at the lower part of the combustion box (10) to communicate with ambient air for oxygen supply; the fireplace housing (1) has an openable glass door (2) on the front side of the combustion chamber (9); the fireplace housing (1) also includes a fuel supply device, an ignition device, an air supply device, and an exhaust device; the fuel supply device is used to controllably deliver fuel to the combustion box (10); the ignition device is an igniter (13) located near the combustion box (10); the... The air supply device includes an air supply fan (14) and an air supply duct (15). The air inlet of the air supply duct (15) is connected to the ambient air via the air supply fan (14), and the air outlet of the air supply duct (15) is connected to the air supply grille (8) of the fireplace shell (1). The exhaust device includes a negative pressure fan (16) and an exhaust pipe (17). The air inlet of the exhaust pipe (17) is connected to the combustion chamber (9), and the air outlet of the exhaust pipe (17) is connected to the ambient air via the negative pressure fan (16). Simultaneously, the exhaust pipe (17) is built into the air supply duct (15) to achieve sufficient gas heat exchange. Its characteristics are: The fireplace housing (1) has a sliding drawer box (11) at the lower part of the combustion chamber (9). The drawer box (11) can be manually slid to adjust the opening degree to change the oxygen supply of the combustion chamber (9) to ensure complete combustion of fuel. The exhaust pipe (17) is connected to the combustion chamber (9) via a counterflow sleeve (18) at the end away from the negative pressure fan (16). The counterflow sleeve (18) is provided with a high thermal conductivity microcrystalline glass (6) at the top. The microcrystalline glass (6) is set on the surface of the fireplace housing (1) for placing heating vessels.

2. The novel pellet combustion fireplace according to claim 1, characterized in that: The counter-flow sleeve (18) includes an inner tube and an outer tube sleeved outside the inner tube. The lower part of the inner tube is directly connected to the combustion chamber (9). The height of the outer tube is higher than that of the inner tube and forms a flow channel for gas flow between the inner tube and the inner tube. The microcrystalline glass (6) is disposed on the outer tube.

3. A novel pellet combustion fireplace according to claim 2, characterized in that: The feeding device includes a feeding hopper (19), a first pushing unit and a second pushing unit in a Z-shape. The feeding hopper (19) is fixed inside the fireplace housing (1). The outlet of the feeding hopper (19) is connected to the inlet of the first pushing unit. The outlet of the first pushing unit is connected to the inlet of the second pushing unit. The outlet of the second pushing unit is connected to the combustion box (10).

4. A novel pellet-burning fireplace according to claim 3, characterized in that: The first feeding unit includes a first feeding pipe (21) and a first auger blade (22) driven by a first motor (20) built into the first feeding pipe (21). The second feeding unit includes a second feeding pipe (24) and a second auger blade (25) driven by a second motor (23) built into the second feeding pipe (24). The fireplace housing (1) is provided with a movable flip cover (7) at a position corresponding to the feed hopper (19).

5. A novel pellet-burning fireplace according to claim 4, characterized in that: The fireplace housing (1) is also equipped with a controller (26). The first motor (20), the second motor (23), the igniter (13), the blower (14), and the negative pressure fan (16) are all electrically connected to the controller (26) to achieve unified control.

6. A novel pellet-fired fireplace according to claim 2, characterized in that: The fireplace housing (1) has a quick-release back panel (5) on its back and openable side panels (4) on both sides. One side of the side panel (4) is hinged to the fireplace housing (1) via a hinge, and the other side of the side panel (4) is connected to the fireplace housing (1) via a magnetic structure.

7. A novel pellet combustion fireplace according to claim 2, characterized in that: The fireplace shell (1) has observation windows (3) on both sides of the combustion chamber (9). The observation windows (3) are made of high-temperature resistant glass. The two observation windows (3) together with the glass door (2) form a three-sided enclosure structure.

8. A novel pellet combustion fireplace according to claim 2, characterized in that: The fireplace housing (1) is also provided with an ash storage box, which is located below the combustion box (10) to collect combustion ash. The ash storage box and the combustion box (10) can be quickly detached and installed on the inner wall of the combustion chamber (9) by hooking, so as to facilitate opening the glass door (2) for quick cleaning.

Images