Negative pressure combustion system for firewood combustion

Abstract

The negative pressure combustion system comprises a combustion chamber, an air inlet cavity, an exhaust cavity and an exhaust fan, the air inlet cavity and the exhaust cavity are arranged at the lower end of the combustion chamber, the exhaust fan is communicated with the exhaust cavity, the air inlet cavity supplies oxygen for the first time from the lower end of the combustion chamber, and an exhaust pipe is arranged between the exhaust cavity and the upper end of the combustion chamber. The air inlet cavity is arranged in the combustion chamber and matched with an exhaust fan and an exhaust pipe to form a negative pressure airflow environment from top to bottom, smoke generated by combustion is exhausted in order, the air inlet pipe is arranged on the outer side of the air inlet cavity, supplies oxygen to the combustion chamber for the second time and is used for supplementing oxygen needed in the combustion process, and generation of incomplete combustion products is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stove, in particular to the technical field of negative pressure combustion system for firewood combustion. BACKGROUND

[0002] Traditional firewood combustion system mostly adopts natural ventilation or forced air positive pressure combustion mode, that is, air is sent into the combustion chamber by a fan to improve combustion intensity and thermal efficiency. Although this method improves combustion efficiency, it can cause airflow turbulence in the combustion chamber, uneven flame distribution, and local high or low temperature, which affects the uniformity of the thermal field. In addition, the internal pressure of the combustion chamber under positive pressure is higher than the external environment, which can easily cause combustion products (such as flue gas, sparks, etc.) to overflow from the stove opening or gap, posing a certain safety hazard.

[0003] To solve this problem, as an improvement measure, negative pressure combustion is used, in which air enters from the set air inlet, and flue gas is sucked and discharged by the fan, achieving a more stable combustion process and preventing flue gas from overflowing.

[0004] However, when negative pressure combustion is applied to firewood combustion, firewood is an irregular biomass fuel, and its combustion process has obvious regional differentiation.

[0005] Therefore, how to optimize the oxygen supply path under negative pressure and provide a more balanced air inlet method to make the combustion thermal field more evenly distributed is a technical bottleneck that needs to be solved for current negative pressure firewood combustion systems. SUMMARY

[0006] In view of the above-mentioned needs, the present application proposes a negative pressure combustion system for firewood combustion, which aims to optimize the air inlet path under negative pressure combustion state to achieve balanced oxygen supply and uniform combustion thermal field.

[0007] To achieve the above-mentioned purposes, the following technical solutions are adopted in the present application: The present application proposes a negative pressure combustion system for firewood combustion, which includes a combustion chamber, an air inlet cavity and an exhaust cavity arranged at the lower end of the combustion chamber, and an exhaust fan communicating with the exhaust cavity, the air inlet cavity supplies oxygen for the first time from the lower end of the combustion chamber, and an exhaust pipe is arranged between the exhaust cavity and the upper end of the combustion chamber; It also includes an air inlet pipe arranged outside the air inlet cavity and supplying oxygen for the second time into the combustion chamber.

[0008] Thus, by integrating the air inlet cavity and the exhaust cavity at the lower end of the combustion chamber, and cooperating with the air extractor and the exhaust pipe to form a top-down negative pressure airflow environment, the smoke generated by combustion is orderly discharged, effectively preventing smoke overflow. At the same time, during the smoke exhaust process, the smoke can also heat the load such as the pot at the upper end, further improving the overall heating uniformity.

[0009] On this basis, the air inlet cavity provided at the lower end of the combustion chamber provides the first oxygen supply to the combustion area through the bottom channel, providing a stable basis for the preliminary mixing and combustion of air and fuel. The air inlet pipe provided outside the air inlet cavity introduces the second oxygen supply into the combustion chamber, which is used to supplement the oxygen required during combustion and reduce the generation of incomplete combustion products.

[0010] In some possible embodiments, the combustion chamber is provided with a peripheral plate and an inner peripheral plate, a combustion space is formed inside the inner peripheral plate, and the air inlet pipe and the exhaust pipe are arranged between the peripheral plate and the inner peripheral plate.

[0011] In some possible embodiments, the bottom of the inner peripheral plate is provided with an air inlet gap.

[0012] In some possible embodiments, a partition plate is further arranged between the inner peripheral plate and the peripheral plate and separates the air inlet pipe and the exhaust pipe.

[0013] In some possible embodiments, the partition plate is provided with an exhaust gap.

[0014] In some possible embodiments, the number of exhaust pipes is two, and the exhaust pipes are arranged on opposite sides of the exhaust gap.

[0015] In some possible embodiments, the height of the peripheral plate is higher than the height of the inner peripheral plate.

[0016] In some possible embodiments, a heat insulation plate is further arranged outside the peripheral plate.

[0017] In some possible embodiments, the air inlet cavity is provided with an air inlet on the other side relative to the air extractor.

[0018] In some possible embodiments, an air inlet hopper is further arranged at the bottom of the combustion chamber, and the height of the air inlet is higher than the height of the air inlet hopper. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall schematic diagram of the negative pressure combustion system for firewood combustion of the present application; Figure 2 is the smoke exhaust cavity explosion schematic diagram of the negative pressure combustion system for firewood combustion of the present application; Figure 3is the schematic diagram of the explosion of the combustion chamber of the negative pressure combustion system for burning firewood of the present application; Figure 4 is the schematic diagram of the position relationship between the air inlet pipe and the exhaust pipe in the present application; Figure 5 is the schematic diagram of the bottom of the air inlet pipe in the present application; Figure 6 is the sectional view of the negative pressure combustion system for burning firewood of the present application; Figure 7 is Figure 6 is the local enlarged schematic diagram at A in the present application. DETAILED DESCRIPTION

[0020] The features of the present application and other related features are further described in detail by the following examples, so as to facilitate the understanding of the skilled in the art: It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular component.

[0021] Further, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present case can be understood according to the specific circumstances.

[0022] Please refer to Figure 1 and Figure 2 , a negative pressure combustion system for burning firewood of the present application, comprising a combustion chamber 1 and an air inlet cavity 2 and an exhaust cavity 3 arranged at the lower end of the combustion chamber 1, and an exhaust fan 4 communicating with the exhaust cavity 3. The combustion chamber 1 and the air inlet cavity 2 and the exhaust cavity 3 at the lower end are provided with a mounting plate 100 to isolate the installation of the combustion chamber 1, and the bottom of the air inlet cavity 2 and the exhaust cavity 3 is provided with a bottom plate 200, which can be provided with a grid 210 for ventilation. In some embodiments, the exhaust cavity 3 is of L-shaped structure, which can cover the rear and side of the air inlet cavity 2, and the side can be provided with the exhaust fan 4, so that the installation of the exhaust fan 4 does not occupy the rear end space, forming a compact structure. Specifically, the combustion chamber 1 is provided with a firewood port 11 for supplementing firewood, and a cooking utensil 300 is arranged at the upper end of the combustion chamber 1, and the air inlet cavity 2 at the lower end provides the first oxygen supply.

[0023] Further, please refer to Figure 1 and Figure 2 , Figure 5The air inlet cavity 2 is provided with an air inlet 21 on the other side of the air exhaust fan 4. An air inlet hopper 12 is provided at the bottom of the combustion chamber 1, and the height of the air inlet 21 is higher than that of the air inlet hopper 12, that is, the air inlet path from the air inlet 21 to the air inlet hopper 12 is not a straight-through structure, but forms a buffer space in the air inlet cavity 2, so that the first oxygen supply is more stable. In some embodiments, an ignition device can be provided at the air inlet hopper 12, which can be a gas-assisted ignition or the like, which is a common technical means in the industry, and will not be described in detail.

[0024] Please refer to Figures 3 to 7 An exhaust pipe 5 is provided between the exhaust cavity 3 and the upper end of the combustion chamber 1 as an exhaust passage. Further, the outer side of the air inlet cavity 2 is provided with an air inlet pipe 6 for the second oxygen supply into the combustion chamber 1, one end of the air inlet pipe 6 being communicated in the combustion chamber 1 and the other end being provided at the lower end of the mounting plate 100.

[0025] Specifically, the combustion chamber 1 is provided with a peripheral plate 13 and an inner peripheral plate 14, and a combustion space is formed inside the inner peripheral plate 14. At the same time, a heat insulation plate 15 is provided on the outer periphery of the peripheral plate 13. At this time, the air inlet pipe 6 and the exhaust pipe 5 are both arranged between the peripheral plate 13 and the inner peripheral plate 14. Further, the bottom of the inner peripheral plate 14 is provided with an air inlet gap 141, and the air inlet of the air inlet pipe 6 directly provides oxygen to the combustion space through the air inlet gap 141.

[0026] Further, a partition plate 16 is provided between the inner peripheral plate 14 and the peripheral plate 13, more specifically at the upper end of the inner peripheral plate 14, to separate the air inlet pipe 6 and the exhaust pipe 5. In this way, one end of the exhaust pipe 5 is in the exhaust cavity 3, and the other end is at the upper end of the partition plate 16, that is, the space between the partition plate 16 and the bottom of the pot 300. The partition plate 16 is provided with an exhaust gap 161, and the flue gas enters the upper end of the partition plate 16 through the exhaust gap 161, and further heats the side edge of the pot 300, and the heating effect is more uniform. At this time, the preferred number of exhaust pipes 5 is 2, which are arranged on the opposite side of the exhaust gap 161 to prolong the flow distance of the flue gas between the upper end of the partition plate 16 and the bottom of the pot 300. In order to make the flue gas flow space more airtight, the height of the peripheral plate 13 is higher than that of the inner peripheral plate 14 to adapt to the bottom of the arc-shaped pot 300. Further, a fixing plate 400 can be provided at the upper end of the mounting plate 100 to fix the air inlet pipe 6, the exhaust pipe 5, and support the inner peripheral plate 14 and the peripheral plate 13.

[0027] Thus, by integrating the air inlet cavity 2 and the exhaust cavity 3 at the lower end of the combustion chamber 1, and cooperating with the air extractor 4 and the exhaust pipe 5 to form a negative pressure airflow environment from top to bottom, the smoke generated by combustion is orderly discharged, effectively preventing the smoke from overflowing. At the same time, during the smoke exhaust process, the smoke can also heat the load such as the pot 300 at the upper end, further improving the overall heating uniformity.

[0028] On this basis, the air inlet cavity 2 provided at the lower end of the combustion chamber 1 provides the first oxygen supply to the combustion area through the bottom channel, providing a stable basis for the preliminary mixing and combustion of air and fuel. The air inlet pipe 6 provided outside the air inlet cavity 2 introduces the second oxygen supply into the combustion chamber 1, which is used to supplement the oxygen required during the combustion process and reduce the generation of incomplete combustion products.

[0029] As described above, the protection of the present case is a negative pressure combustion system for firewood combustion, and all technical solutions similar or similar to the present case should be shown to fall within the protection scope of the present case.

Claims

1. A negative pressure combustion system for firewood combustion, characterized in that: It comprises a combustion chamber (1), an air inlet chamber (2) and an exhaust chamber (3) arranged at the lower end of the combustion chamber (1), and an exhaust fan (4) connected to the exhaust chamber (3), wherein the air inlet chamber (2) supplies oxygen for the first time from the lower end of the combustion chamber (1), and an exhaust pipe (5) is provided between the exhaust chamber (3) and the upper end of the combustion chamber (1); It also includes an air inlet pipe (6) arranged outside the air inlet cavity (2) and supplying oxygen to the combustion chamber (1) for the second time.

2. A negative pressure combustion system for firewood combustion according to claim 1, characterized in that: The combustion chamber (1) is provided with an outer plate (13) and an inner plate (14), a combustion space is formed within the inner plate (14), and the air inlet pipe (6) and the exhaust pipe (5) are arranged between the outer plate (13) and the inner plate (14).

3. A negative pressure combustion system for firewood combustion according to claim 2, characterized in that: An air inlet notch (141) is provided at the bottom of the inner enclosure plate (14).

4. A negative pressure combustion system for firewood combustion according to claim 2, characterized in that: It also includes a partition plate (16) disposed between the inner panel (14) and the outer panel (13) and isolating the air inlet pipe (6) and the exhaust pipe (5).

5. A negative pressure combustion system for firewood combustion according to claim 4, characterized in that: The partition (16) is provided with an exhaust notch (161).

6. A negative pressure combustion system for firewood combustion according to claim 6, characterized in that: The number of the exhaust pipes (5) is two, and they are arranged on opposite sides of the exhaust notch (161).

7. A negative pressure combustion system for firewood combustion according to claim 2, characterized in that: The height of the outer panel (13) is higher than the height of the inner panel (14).

8. A negative pressure combustion system for firewood combustion according to claim 2, characterized in that: It also includes a heat insulation plate (15) arranged on the periphery of the peripheral plate (13).

9. The negative pressure combustion system for firewood combustion according to claim 1, characterized in that: An air inlet (21) is provided on the other side of the air inlet chamber (2) relative to the exhaust fan (4).

10. A negative pressure combustion system for firewood combustion according to claim 9, characterized in that: It also includes an air inlet scoop (12) arranged at the bottom of the combustion chamber (1), and the height of the air inlet (21) is higher than the height of the air inlet scoop (12).

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