Honeycomb silent burner with inlet air cooling function

Abstract

The utility model discloses a honeycomb silence burner with an inlet air cooling function. The honeycomb silence burner comprises a silence chamber, a combustion chamber and a burner body. The mute chamber is of a vertically-through barrel structure and is arranged above the combustion chamber. The mute chamber comprises an inner barrel shell and an outer barrel shell; a second combustion cavity is defined by the inner barrel shell. The inner barrel shell and the outer barrel shell are arranged at an interval and form a sound insulation cavity; a plurality of second air inlets are formed in the outer barrel shell, and a plurality of second air supplementing openings are formed in the inner barrel shell. According to the utility model, the silence chamber prevents combustion sound from being transmitted to the outside of the cylinder body through the sound insulation cavity formed by the inner cylinder shell and the outer cylinder shell at an interval, so that the silence effect is achieved; and the air flow flowing in the sound insulation cavity can also achieve the cooling effect on the mute chamber, heat of the barrel and the inner shell wall can be taken away, the temperature of the mute device is reduced, the temperature rise is reduced, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heating equipment, and particularly relates to a honeycomb silent burner with air inlet cooling. Background Art

[0002] Gas heating equipment includes wall-mounted boilers, water heaters, etc. Its combustion heat exchange structure generally includes components such as burners, water tanks, heat exchangers, and hot water pipes. The market has been seeking to design burners with higher thermal efficiency to improve the efficiency of combustion heat exchange. For example, a water heater with a new combustion structure proposed in patent number 2022226887524 uses the principle of "air above fire", opens a secondary air supply port above the combustion chamber, and uses air staging combustion technology to reduce the local high temperature of the flame, enabling the unburned fuel in the combustion chamber to continue burning. However, during the test use, it is found that in the area where secondary combustion of fuel occurs above the combustion chamber, the heat of secondary combustion will cause the temperature of the adjacent combustion chamber to rise, with an obvious temperature increase. When the water heater or wall-mounted boiler pauses water supply and hot water is provided again, the temperature of the small amount of hot water output is too high, which is easy to scald users and there are potential safety hazards; moreover, secondary combustion will generate obvious noise; in addition, the outer shell of the high-temperature combustion chamber is also prone to damage the internal components of the water heater or wall-mounted boiler. Therefore, further improvement is needed. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model proposes a honeycomb silent burner with air inlet cooling.

[0004] One embodiment of the utility model adopts the following technical solution to solve its technical problem: A honeycomb silent burner with air inlet cooling, comprising: a silent chamber, a combustion chamber, and a burner;

[0005] The silent chamber has a cylindrical structure that is vertically through and is arranged above the combustion chamber; the burner is arranged at the lower end of the combustion chamber, and a first combustion chamber is arranged at the upper end of the combustion chamber; several first air supply ports are arranged below the first combustion chamber; several main air intake holes are arranged below the combustion chamber.

[0006] The silent chamber includes an inner cylinder shell and an outer cylinder shell; the inner cylinder shell encloses a second combustion chamber; the inner cylinder shell and the outer cylinder shell are spaced apart to form a sound insulation chamber; several second air intake ports are opened on the outer cylinder shell, and several second air supply ports are opened on the inner cylinder shell.

[0007] Optionally, the second air supply ports are inclined so that the air in the sound insulation chamber can be inclined and sent above the second combustion chamber.

[0008] Optionally, the second air supply opening is a groove-shaped or hole-shaped structure provided on the inner cylinder shell.

[0009] Optionally, a plurality of groups of the second air supply openings are arranged at intervals in the vertical direction of the second combustion chamber; a plurality of second air supply openings in the same group are distributed in a ring shape around the second combustion chamber in the circumferential direction.

[0010] Optionally, the inner cylinder shell is provided with a plurality of reinforcing ribs or profiling structures in a protruding or recessed shape.

[0011] Optionally, the burner includes a plurality of fire rows arranged side by side at intervals; the first air supply opening is located at the lower end of the first combustion chamber and is arranged close to the top of the fire row.

[0012] Optionally, the combustion chamber includes a bottom sealing plate, and the main air inlet hole is opened on the bottom sealing plate; the main air inlet hole is arranged between two adjacent fire rows.

[0013] Optionally, the bottom sealing plate is further provided with a plurality of secondary air inlet holes, and the secondary air inlet holes are arranged below the fire rows.

[0014] The generation ratio of nitrogen oxides is related to factors such as the fuel-air mixing ratio, combustion efficiency, and locally high combustion temperature in the combustion chamber. The air staging combustion technology is an effective method for reducing nitrogen oxide emissions. That is, the air required for combustion is fed in two stages. In the first stage, at the initial stage of combustion, primary air is fed at the fire row of the main burner, and the air volume supplied from the main burner is reduced to 70-80% of the total combustion air volume, so that the fuel first burns under oxygen-deficient rich fuel combustion conditions. At this time, the reaction rate of generating NOx is reduced in the reducing atmosphere, and the generation amount of NOx in this combustion is inhibited. In the second stage, in the later stage of combustion, an appropriate amount of secondary air, also known as "over-fire air", is fed into the flame combustion area, so that the unburned fuel continues to burn. At this time, the amount of NOx generated is limited, and the nitrogen oxide emissions can be effectively reduced.

[0015] The beneficial effects of the utility model are as follows: the first air supply port is used to send secondary air from the top of the first combustion chamber as the secondary air, that is, using the "wind on fire" air staged combustion technology to reduce the local high temperature of the flame, so that the unburned fuel in the combustion chamber continues to burn; the soundproof chamber formed by the inner cylinder shell and the outer cylinder shell blocks the combustion sound from being transmitted outside the cylinder, thereby achieving a silent effect; and the second air inlet and the second air supply port can send secondary air from the top of the second combustion chamber through the soundproof chamber as the secondary air of the second combustion chamber, and again using the "wind on fire" air staged combustion technology to further perform secondary combustion on the fuel in the silent chamber, so that the unburned fuel in the combustion chamber continues to burn, effectively reducing the emission of nitrogen oxides. And the airflow flowing in the soundproof chamber can also achieve a cooling effect on the silent chamber, can take away the heat of the cylinder and the inner shell wall, reduce the temperature of the silent device, reduce the temperature rise, and improve the safety performance.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of the burner of the utility model;

[0019] Figure 2 for Figure 1 A cross-sectional view of the burner;

[0020] Figure 3 for Figure 1 Bottom view of the middle burner.

[0021] Description of main component symbols:

[0022] 10. Quiet room; 11. Inner cylinder shell; 12. Outer cylinder shell; 13. Second combustion chamber; 14. Soundproof chamber; 15. Second air inlet; 16. Second air supply port; 20. Combustion chamber; 21. First combustion chamber; 22. First air supply port; 23. Bottom sealing plate; 24. Main air inlet; 25. Auxiliary air inlet; 30. Burner; 31. Fire grate. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0024] In the description of the present utility model, the meaning of "a plurality of" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0025] In the description of the present utility model, it should be understood that regarding the orientation description, such as the orientation or positional relationship indicated by "up", "down", "front", "back", "left", "right", etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0026] In the present utility model, unless otherwise clearly defined, terms such as "arranged", "installed", and "connected" should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected; they can be the communication inside two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0027] Embodiment

[0028] Referring to Figures 1 to 3 , a honeycomb silent burner 30 with air inlet cooling proposed by the present utility model includes: a silent chamber 10, a combustion chamber 20, and a burner 30;

[0029] The silent chamber 10 has a cylindrical structure that is vertically through and is arranged above the combustion chamber 20; the burner 30 is arranged at the lower end of the combustion chamber 20, and a first combustion chamber 21 is arranged at the upper end of the combustion chamber 20; several first air supply openings 22 are arranged below the first combustion chamber 21; several main air inlet holes 24 are arranged below the combustion chamber 20;

[0030] The silent chamber 10 includes an inner cylinder shell 11 and an outer cylinder shell 12; a second combustion chamber 13 is surrounded by the inner cylinder shell 11; the inner cylinder shell 11 and the outer cylinder shell 12 are arranged at intervals to form a sound insulation chamber 14; several second air inlet openings 15 are opened on the outer cylinder shell 12, and several second air supply openings 16 are opened on the inner cylinder shell 11.

[0031] The generation ratio of nitrogen oxides is related to factors such as the mixing ratio of fuel and air, combustion efficiency, and the locally high combustion temperature in the combustion chamber 20. The air-staged combustion technology is an effective method to reduce nitrogen oxide emissions. That is, the air required for combustion is fed in two stages. In the first stage, at the initial stage of combustion, primary air is fed at the burner ports 31 of the main burner 30, and the amount of air supplied from the main burner 30 is reduced to 70 - 80% of the total combustion air volume, so that the fuel first burns under oxygen-deficient fuel-rich combustion conditions. At this time, the reaction rate of NOx formation is reduced in the reducing atmosphere, and the generation amount of NOx in this combustion is inhibited. In the second stage, at the later stage of combustion, an appropriate amount of secondary air, also known as "over-fire air", is fed into the flame combustion area, so that the unburned fuel continues to burn. At this time, the amount of NOx generated is limited, and the nitrogen oxide emissions can be effectively reduced.

[0032] In the present utility model, the first air supply opening 22 feeds secondary air above the first combustion chamber 21 as secondary air, that is, the "over-fire air" air-staged combustion technology is used to reduce the local high temperature of the flame and make the unburned fuel in the combustion chamber 20 continue to burn; the soundproof chamber 10 forms a sound insulation cavity 14 through the inner cylinder shell 11 and the outer cylinder shell 12, blocking the combustion sound from transmitting outside the cylinder to achieve a soundproof effect; and, the second air inlet 15 and the second air supply opening 16 can feed secondary air above the second combustion chamber 13 through the sound insulation cavity 14 as the secondary air of the second combustion chamber 13, and the "over-fire air" air-staged combustion technology is used again to further perform secondary combustion of the fuel in the soundproof chamber 10, making the unburned fuel in the combustion chamber 20 continue to burn, effectively reducing nitrogen oxide emissions. And the airflow flowing in the sound insulation cavity 14 can also achieve the cooling effect on the soundproof chamber 10, taking away the heat of the cylinder body and the inner shell wall, reducing the temperature of the soundproof device, reducing the temperature rise, and improving the safety performance.

[0033] In this embodiment, the second air supply opening 16 is inclined, so that the air in the sound insulation cavity 14 can be fed obliquely above the second combustion chamber 13. Since in the combustion chamber 20 of a water heater or a wall-mounted boiler, the flame and the air flow flow from bottom to top, the secondary air supplemented by the air in the heat insulation cavity is fed obliquely upward into the combustion chamber 20, and the upward air flow in the combustion chamber 20 can be utilized, without being blocked, and more air can be sucked in, so as to better mix and burn with the flame. Specifically, the lower part of the second air supply opening 16 can be pressed and formed inwardly to form an inclined air supply channel.

[0034] In this embodiment, the second air supply opening 16 is a groove-shaped or hole-shaped structure provided on the inner cylinder shell 11. Preferably, the second air supply opening 16 is a groove-shaped structure, and the shell wall of the inner cylinder shell 11 is locally pressed inward to form a notch, so as to form an inclined air supply channel in a groove shape.

[0035] In this embodiment, a plurality of groups of second air inlets 16 are vertically spaced along the second combustion chamber 13; a plurality of second air inlets 16 in the same group are distributed in a ring shape around the second combustion chamber 13 in the circumferential direction. A plurality of groups of second air inlets 16 are formed vertically and distributed in a ring shape around the second combustion chamber 13, which can supplement secondary air for multiple regions such as the tip, middle, and tail of the flame combustion in the second combustion chamber 13, more effectively and completely supplement secondary air, and make full use of the staged combustion technology for combustion.

[0036] In this embodiment, the inner cylinder shell 11 is provided with a plurality of raised or recessed reinforcing ribs or profiled structures. The reinforcing ribs or profiled structures are densely arranged in a honeycomb shape. On the one hand, the physical strength of the inner cylinder shell 11 can be increased. On the other hand, the air flow in the second combustion chamber 13 can form turbulence on the shell wall, making the mixing of gas and air more uniform.

[0037] In this embodiment, the burner 30 includes a plurality of burners 31 arranged side by side at intervals; the first air inlet 22 is located at the lower end of the first combustion chamber 21 and is arranged close to the top of the burner 31. Under the action of the upward air flow formed by the fan and the high-temperature fuel, air can be sent in from the first air inlet 22 and the flame close to the burner 31 is sent out, achieving the effect of supplementing secondary air.

[0038] In this embodiment, the combustion chamber 20 includes a bottom sealing plate 23, and a main air inlet hole 24 is opened on the bottom sealing plate 23; the main air inlet hole 24 is arranged between two adjacent burners 31. The bottom sealing plate 23 seals the air inlet surface below the combustion chamber 20. Then, by opening a limited number of main air inlet holes 24, when the fan speed remains unchanged, the air flow rate remains unchanged, and the air inlet area is reduced, so that the air flow velocity of the main air inlet hole 24 is accelerated, and the air enters the combustion chamber 20 more quickly, and quickly supplements the primary air from the gaps between the set burners 31 above the burners 31, ensuring the mixing effect of the primary air and the fuel at the output end of the burners 31.

[0039] Specifically, the bottom sealing plate 23 is also provided with a plurality of secondary air inlet holes 25, and the secondary air inlet holes 25 are arranged below the burners 31. The secondary air inlet holes 25 are arranged in the gaps around the main air inlet holes 24 in an interleaved manner, effectively increasing the amount of primary air sent into the space below the burners 31.

[0040] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A honeycomb silent burner with air inlet cooling, characterized in that: include: A silent chamber (10), a combustion chamber (20) and a burner (30); The silent chamber (10) is a cylindrical structure that is connected from top to bottom and is arranged above the combustion chamber (20); the burner (30) is arranged at the lower end of the combustion chamber (20); a first combustion chamber (21) is arranged at the upper end of the combustion chamber (20); a plurality of first air supply ports (22) are arranged below the first combustion chamber (21); a plurality of main air inlet holes (24) are arranged below the combustion chamber (20); The silent chamber (10) comprises an inner cylinder shell (11) and an outer cylinder shell (12); the inner cylinder shell (11) is provided with a second combustion chamber (13); the inner cylinder shell (11) and the outer cylinder shell (12) are spaced apart and form a soundproof chamber (14); the outer cylinder shell (12) is provided with a plurality of second air inlets (15), and the inner cylinder shell (11) is provided with a plurality of second air supply ports (16).

2. The honeycomb silent burner with air inlet cooling according to claim 1, characterized in that: The second air supply port (16) is arranged at an angle, so that the air in the sound insulation chamber (14) can be sent obliquely toward the top of the second combustion chamber (13).

3. The honeycomb silent burner with air inlet cooling according to claim 1, characterized in that: The second air supply port (16) is a groove-shaped or hole-shaped structure arranged on the inner cylinder shell (11).

4. The honeycomb silent burner with air inlet cooling according to claim 1, characterized in that: The second air supply ports (16) are arranged in a plurality of groups at vertical intervals along the second combustion chamber (13); the plurality of second air supply ports (16) in the same group are distributed in a ring shape around the second combustion chamber (13) in the circumferential direction.

5. The honeycomb silent burner with air inlet cooling according to claim 1, characterized in that: The inner cylinder shell (11) is provided with a plurality of raised or recessed reinforcing ribs or pressed structures.

6. The honeycomb silent burner with air inlet cooling according to claim 1, characterized in that: The burner (30) comprises a plurality of fire bars (31) arranged side by side at intervals; the first air supply port (22) is located at the lower end of the first combustion chamber (21) and is arranged close to the top of the fire bars (31).

7. The honeycomb silent burner with air inlet cooling according to claim 6, characterized in that: The combustion chamber (20) comprises a bottom sealing plate (23), and the main air intake hole (24) is opened in the bottom sealing plate (23); the main air intake hole (24) is arranged between two adjacent fire bars (31).

8. The honeycomb silent burner with air inlet cooling according to claim 7, characterized in that: The bottom sealing plate (23) is also provided with a plurality of auxiliary air inlet holes (25), and the auxiliary air inlet holes (25) are arranged below the fire bar (31).

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