Outer ring fire cover and combustor

Abstract

The outer ring fire cover comprises a fire cover body, the fire cover body is provided with a plurality of fire holes distributed in the circumferential direction of the fire cover body, and the outer ring fire cover further comprises a noise reduction structure; the silencing structures are arranged on the sides, facing the radial inner side of the fire cover body, of the fire holes, the silencing structures and the fire holes are arranged in the radial direction of the fire cover body at intervals, and gas chambers communicating with the fire holes are formed. The noise reduction structure comprises a gas channel and a plurality of noise reduction parts arranged in the circumferential direction of the fire cover body at intervals, and the gas channel is formed by the interval between every two adjacent noise reduction parts. And the structure of the fuel gas channel is set as follows: the flow rate of fuel gas flowing through the fuel gas channel is greater than that of fuel gas flowing through the fuel gas chamber. The silencing structure is arranged in the outer ring fire cover, so that gas flowing to the fire holes is silenced, and the combustion performance of the combustor is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas stoves, in particular to an outer ring fire cover and a burner. BACKGROUND

[0002] In the use process of the gas stove, the burner may produce a howling phenomenon during combustion, affecting the user's experience. At present, in order to suppress the generation of noise, the wind door is usually closed and the primary air supply is reduced.

[0003] However, adjusting the wind door cannot fundamentally eliminate the acoustic resonance in the combustion process. Secondly, reducing the wind door will compress the adjustable range of the wind door, resulting in a decrease in the adaptability of the burner to different gas compositions and pressure changes, thereby weakening the gas adaptability of the burner. In addition, reducing the primary air supply may cause insufficient combustion of the gas, resulting in an increase in the emission concentration of harmful combustion products such as carbon monoxide (CO), which poses a safety hazard. Although the howling can be suppressed by adjusting the wind door, the combustion performance of the burner is reduced. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects in the prior art that the outer ring fire cover is difficult to simultaneously mute and ensure the combustion performance of the burner. The present application provides an outer ring fire cover and a burner, which can suppress howling and does not affect the combustion performance of the burner.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] An outer ring fire cover, comprising a fire cover body provided with a plurality of fire holes distributed along the circumference thereof, the outer ring fire cover further comprising a sound absorbing structure;

[0007] The sound absorbing structure is arranged on one side of the fire hole towards the radial inner side of the fire cover body, and the sound absorbing structure and the fire hole are arranged in a radial direction of the fire cover body and form a gas chamber in communication with the fire hole;

[0008] The sound absorbing structure comprises a gas passage and a plurality of sound absorbing portions arranged in a circumferential direction of the fire cover body, and the interval between two adjacent sound absorbing portions forms the gas passage; each sound absorbing portion is provided with a partition cavity, the partition cavity is provided with an air inlet and an air outlet in communication with the gas chamber, and the area of the air inlet of the partition cavity is greater than the area of the air outlet of the partition cavity;

[0009] The structure of the gas passage is arranged so that the flow rate of the gas flowing through the gas passage is greater than the flow rate of the gas flowing through the gas chamber.

[0010] In this design, the gas flow through the gas channel forms a first gas wall, which divides the gas chamber into multiple independent zones along the circumference of the burner body. This prevents interference between the airflows on both sides of the first gas wall, suppressing whistling without affecting the burner's combustion performance. The area of ​​the air inlet of the silencer is larger than that of the air outlet, increasing the gas pressure within the partition chamber. This causes the gas flow velocity at the outlet of the silencer to be greater than that at the inlet, forming a second gas wall. This second gas wall slows down the gas flow, preventing eddies or resonance caused by excessively high gas velocity.

[0011] The silencing structure also includes a cover plate, which is placed on the silencing structure. The cover plate and each of the silencing parts enclose the corresponding partition cavity of the silencing part, and the cover plate and the gap between two adjacent silencing parts enclose the gas passage.

[0012] The silencing section includes at least two first partitions spaced apart circumferentially along the burner body, and a second partition connected between the at least two first partitions. Each first partition abuts against the cover plate and surrounds the cover plate and the burner body to form the air inlet. The gas passage is formed between the adjacent first partitions of the silencing sections that are close to each other.

[0013] In this design, at least two first baffles of each silencing section, together with the cover plate and the burner body, form an air inlet, and a gas passage is formed between the first baffles of adjacent silencing sections that are close to each other, making the structure compact.

[0014] The silencing section also includes a third partition for dividing the partition cavity into a silencing cavity and a damping cavity along the circumference of the flame cap body. The third partition has a communication port for connecting the silencing cavity and the damping cavity.

[0015] In this scheme, when the airflow flows rapidly through the damping cavity, it can consume the resonance energy in the damping cavity, thereby suppressing the resonance in the damping cavity caused by the resonance at the fire hole. The airflow in the silencer cavity enters the damping cavity through the connecting port, further suppressing the resonance in the damping cavity, thereby reducing the howling caused by resonance.

[0016] In the circumferential direction of the flame cap body, the width of the damping cavity is greater than the width of the silencing cavity.

[0017] In this design, the width of the damping cavity is greater than the width of the silencing cavity to prevent the flame from leaving the corresponding fire hole due to excessive airflow velocity.

[0018] The second partition has a pressure relief port in the portion corresponding to the damping cavity, which is used to connect the damping cavity and the gas chamber. The pressure relief port is connected to the gas outlet.

[0019] In this design, the airflow in the damping cavity enters the gas chamber through the pressure relief port, thereby suppressing the resonance of the gas chamber and the disturbance eddy current, reducing the howling caused by the eddy current.

[0020] The second partition and the cover plate are spaced apart axially on the flame cap body to form the air outlet.

[0021] In this design, the second air wall formed by the air outlet slows down the gas rushing into the burner body from the side closest to the cover plate, preventing the gas from generating eddies or resonance due to excessive airflow speed.

[0022] The flame cap body is provided with a connecting post in the area corresponding to the cover plate. The cover plate and the connecting post are respectively provided with a first connecting hole and a second connecting hole corresponding to the first connecting hole. Fasteners are inserted into the first connecting hole and the second connecting hole and are fixedly connected to the connecting post to fix the cover plate to the flame cap body.

[0023] In this solution, the cover plate is fixed to the flame cap body by fasteners and connecting columns, ensuring the stability of the connection between the cover plate and the flame cap body.

[0024] A burner comprising the aforementioned outer ring flame cap.

[0025] The positive and progressive effects of this invention are as follows:

[0026] The outer ring burner and the burner incorporate a silencing structure within the outer ring burner to silence the gas flowing to the burner holes.

[0027] At the same time, a gas passage is formed by the gap between two adjacent silencers. The narrow cross-section of the gas passage allows the gas flow velocity through the gas passage to be faster, so as to form a first gas wall. The first gas wall divides the gas chamber into multiple independent areas along the circumference of the burner body, blocking the mutual interference between the airflows on both sides of the first gas wall. While suppressing the whistling, it does not affect the combustion performance of the burner. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the outer ring flame cap according to an embodiment of the present invention.

[0029] Figure 2 This is an exploded view of the outer ring fire cap according to an embodiment of the present invention.

[0030] Figure 3 for Figure 2 A magnified view of a portion of point A.

[0031] Figure 4 This is an isometric sectional view of the outer ring fire cover according to an embodiment of the present invention.

[0032] Figure 5 for Figure 4 A magnified view of a portion of point B.

[0033] Figure 6 This is a schematic diagram of the assembly of the outer ring flame cap and the mixing chamber according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10-Flame cap body; 11-Flame hole; 12-Gas chamber;

[0036] 20-Silencer section; 201-Separation cavity; 21-First partition; 211-Air inlet; 212-Gas passage; 22-Second partition; 221-Air outlet; 222-Pressure relief port; 23-Third partition; 231-Damping cavity; 232-Silencer cavity; 233-Connecting port; 24-Connecting column; 241-Second connecting hole;

[0037] 30 - Cover plate; 31 - First connecting hole;

[0038] 40 - Mixing chamber. Detailed Implementation

[0039] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0040] See Figure 1 and Figure 2 This invention proposes an outer ring flame cap, comprising a flame cap body 10 and a silencing structure. The flame cap body 10 has a plurality of flame holes 11 distributed circumferentially thereon. The silencing structure is located on the side of the flame holes 11 facing the radially inner side of the flame cap body 10. The silencing structure and the flame holes 11 are arranged at intervals in the radial direction of the flame cap body 10, forming a combustion chamber 12, which communicates with the flame holes 11. By setting the silencing structure on the flame cap body 10 corresponding to the flame holes 11, the combustion gas flowing to the flame holes 11 is silenced.

[0041] See Figure 3 In some embodiments, the silencing structure includes a gas passage 212 and a plurality of silencing parts 20 arranged circumferentially along the burner cap body 10. The silencing parts 20 can be integrally formed with the burner cap body 10, or the silencing parts 20 can be fixedly connected to the burner cap body 10 by welding, interference fit, snap-fit, fastener connection or other means.

[0042] Specifically, a gas passage 212 is formed between two adjacent silencing sections 20. The structure of the gas passage 212 is configured such that the gas flow velocity through the gas passage 212 is greater than the gas flow velocity through the gas chamber 12. Since the gas passage 212 is formed using the narrow space between the two silencing sections 20, its cross-sectional area is relatively narrow, allowing the gas flow velocity through the gas passage 212 to be greater than the gas flow velocity in the area near the gas passage 212. This forms a first gas wall, which divides the gas chamber 12 into multiple independent regions along the circumference of the burner body 10, thereby reducing the mutual influence between each independent region (i.e., the regions on both sides of the first gas wall within the gas chamber 12). Furthermore, the generated first gas wall divides the burner hole 11 into multiple independent regions, each with a smaller cavity, thus preventing vortices from forming during gas delivery to the burner hole 11. When vortices or resonance occur in the airflow between two adjacent gas passages 212, the first gas wall formed within the gas passage 212 can block this airflow, thereby preventing mutual interference and vortex coupling between adjacent regions and suppressing the development of vortices. In addition, since the first air wall in the gas passage 212 is formed by dynamic airflow, when the airflow that generates eddies or resonance diffuses into the gas passage 212, the first air wall plays a damping role, which can reduce vibration or suppress eddies.

[0043] See Figures 3 to 5 In this embodiment, to achieve noise reduction, each noise reduction section 20 is provided with a partition cavity 201. The partition cavity 201 has an air inlet 211 and an air outlet 221. The air outlet 221 of the partition cavity 201 is connected to the combustion chamber 12. The gas in the partition cavity 201 enters the combustion chamber 12 through the air outlet 221, suppressing the resonance of the gas in the combustion chamber 12 and the disturbance eddy current, thereby reducing the howling caused by the eddy current.

[0044] Furthermore, the area of ​​the air inlet 211 of the partition chamber 201 is larger than the area of ​​the air outlet 221 of the partition chamber 201, which can increase the air pressure in the partition chamber 201. This causes the gas flow velocity at the air outlet 221 of the silencer 20 to be greater than the gas flow velocity at the air inlet 211. The gas in the silencer 20 is ejected from the air outlet 221, forming a second air wall. This slows down the gas flowing through the second air wall, preventing the gas from generating eddies or resonance due to excessive flow velocity. In addition, the gas flowing through the second air wall in the gas chamber 12 and the gas forming the second air wall form a counter-current, promoting the mixing of gas and air, which is beneficial for complete combustion.

[0045] Furthermore, since both the first and second air walls are generated by dynamic gas flow—that is, by some gas flowing at a higher velocity than others after passing through a narrow channel—the silencing section 20 and the deceleration and separation effect of the gas passage formed by the gaps between the silencing sections 20 have an adaptive characteristic positively correlated with gas pressure. When the gas pressure increases (e.g., under high-pressure conditions with a large damper), the gas velocity flowing through the gas passage 212 and the outlet 221 increases accordingly, strengthening the aforementioned air walls and thus enhancing their obstruction effect on the airflow passing through them. Conversely, under low gas pressure conditions, the strength of the air walls weakens, ensuring that the silencing section 20 does not affect the flow of gas inside the burner cap body 10, avoiding a reduction in the burner's combustion performance. This ensures that the silencing section 20 reduces noise without affecting the burner's combustion performance under various operating conditions.

[0046] See Figure 2 and Figure 5 In some embodiments, the silencing structure further includes a cover plate 30, which is disposed on the silencing structure. The cover plate 30 and each silencing part 20 enclose a corresponding partition cavity 201 of the silencing part 20. The gap between the cover plate 30 and two adjacent silencing parts 20 encloses a gas passage 212.

[0047] See Figure 3 and Figure 5 In some embodiments, the silencing section 20 includes at least two first partitions 21 spaced apart circumferentially along the burner cap body 10, and a second partition 22 connected between the at least two first partitions 21. Each first partition 21 abuts against the cover plate 30 and surrounds the cover plate 30 and the burner cap body 10 to form the air inlet 211. A gas passage 212 is formed between the first partitions 21 of adjacent silencing sections 20 that are close to each other.

[0048] In one embodiment, the aforementioned air outlet 221 is located on the side of the second partition 22 near the cover plate 30 and extends circumferentially along the burner body 10. For example, the second partition 22 and the cover plate 30 are spaced apart axially in the burner body 10 to form the air outlet 221. The second air wall formed at the air outlet 221 slows down the gas rushing into the combustion chamber 12 from the side of the burner body 10 near the cover plate 30, preventing eddies or resonance caused by excessively high airflow velocity.

[0049] A gas passage 212 is formed between the first partitions 21 of adjacent silencing sections 20 that are close to each other. Furthermore, by opening an air outlet 221 in the second partition 22, a first air wall is formed on both sides of each silencing section 20, and a second air wall is formed in the gas chamber 12 near the air outlet 221. The structure is compact and improves space utilization.

[0050] Continue reading Figure 3and Figure 5 In some embodiments, the silencing section 20 further includes a third partition 23 for dividing the partition cavity 201 into a silencing cavity 232 and a damping cavity 231 along the circumference of the flame cap body 10. When the airflow flows rapidly through the damping cavity 231, it can consume the resonant energy in the damping cavity 231, thereby suppressing the resonance in the damping cavity 231 caused by the resonance at the flame hole 11.

[0051] Furthermore, the third partition 23 has a connecting opening 233 for connecting the silencing cavity 232 and the damping cavity 231. In one embodiment, the connecting opening 233 is located on the side of the third partition 23 near the cover plate 30, or there is a gap between the third partition 23 and the cover plate 30 to form the connecting opening 233. When the resonance generated at the fire hole 11 propagates to the damping cavity 231, causing the gas in the damping cavity 231 to vibrate synchronously, the airflow in the silencing cavity 232 enters the damping cavity 231 through the connecting opening 233, which can weaken the resonance energy in the damping cavity 231, thereby reducing the noise generated by the resonance.

[0052] In one embodiment, a pressure relief port 222 is provided on a portion of the damping cavity 231 corresponding to the second partition 22 for connecting the damping cavity 231 and the gas chamber 12. Optionally, the pressure relief port 222 is located on the side of the second partition 22 near the cover plate 30, extending from the side of the second partition 22 near the cover plate 30 away from the second cover plate 30, and the pressure relief port 222 is connected to the gas outlet 221. If the airflow velocity at the gas outlet 221 is too high, the gas will be obstructed when passing through the second air wall, which is not conducive to the continuous and stable combustion of the burner. By providing a pressure relief port 222 on the second partition 22, the airflow velocity of the second air wall at the gas outlet 221 can be reduced accordingly, which is beneficial to the stable combustion of the burner. In addition, the gas in the damping chamber enters the gas chamber 12 through the pressure relief port 222, reducing the resonance in this area or suppressing eddies, thereby reducing the howling caused by vibration or eddies.

[0053] Furthermore, in the circumferential direction of the flame cap body 10, the width of the damping cavity 231 is greater than the width of the silencing cavity 232, ensuring that the gas content in the damping cavity 231 reaches a preset amount, thereby ensuring that the gas in the damping cavity 231 can play a damping role and thus suppress resonance. In addition, the silencing cavity 232 is used to generate airflow from the connecting port 233 into the damping chamber to reduce resonance in the damping cavity 231. If the volume of the silencing cavity 232 is too large, a large amount of gas will enter the damping cavity 231 from the silencing cavity 232, which may increase the gas pressure in the damping cavity 231, thereby increasing the airflow velocity at the pressure relief port 222, leading to the risk of flame lift-off of the flame hole 11 corresponding to the pressure relief port 222. By making the width of the damping cavity 231 greater than the width of the silencing cavity 232, while ensuring that the damping cavity 231 plays a damping role, it also prevents the flame hole 11 corresponding to the pressure relief port 222 from lifting off due to excessive airflow velocity.

[0054] See Figure 2 The area of ​​the flame cap body 10 corresponding to the cover plate 30 is provided with a connecting post 24. The cover plate 30 and the connecting post 24 are respectively provided with a first connecting hole 31 and a second connecting hole 241 corresponding to the first connecting hole 31. Fasteners are inserted into the first connecting hole 31 and the second connecting hole 241 and are fixedly connected to the connecting post 24 to fix the cover plate 30 to the flame cap body 10. By fixing the cover plate 30 to the flame cap body 10 with fasteners and connecting post 24, the connection stability between the cover plate 30 and the flame cap body 10 is ensured.

[0055] See Figure 6 The present invention also proposes a burner including the aforementioned outer ring flame cap and a mixing chamber 40, wherein the chamber of the mixing chamber 40 is connected to the gas chamber 12, ensuring the gas content in the gas chamber 12, enabling the burner to achieve stable and continuous combustion, thereby ensuring the combustion performance of the burner. By employing the aforementioned outer ring flame cap, the noise reduction performance of the burner is improved, and the whistling caused by the flow of gas within the flame cap is effectively avoided.

[0056] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An outer ring flame cap, comprising a flame cap body, the flame cap body having a plurality of flame holes distributed circumferentially thereon, characterized in that, The outer ring fire cap also includes a sound-absorbing structure; The silencing structure is located on the side of the flame hole facing the radial inner side of the flame cap body. The silencing structure and the flame hole are arranged radially spaced on the flame cap body and form a gas chamber communicating with the flame hole. The silencing structure includes a gas passage and a plurality of silencing parts spaced circumferentially along the burner body, with the interval between two adjacent silencing parts forming the gas passage; each silencing part is provided with a partition cavity, the partition cavity is provided with an air inlet and an air outlet communicating with the gas chamber, and the area of ​​the air inlet of the partition cavity is larger than the area of ​​the air outlet of the partition cavity. The structure of the gas passage is configured such that the gas flow velocity through the gas passage is greater than the gas flow velocity through the gas chamber.

2. The outer ring flame cap as described in claim 1, characterized in that, The silencing structure also includes a cover plate, which is placed on the silencing structure. The cover plate and each of the silencing parts enclose the corresponding partition cavity of the silencing part, and the cover plate and the gap between two adjacent silencing parts enclose the gas passage.

3. The outer ring flame cap as described in claim 2, characterized in that, The silencing section includes at least two first partitions spaced apart circumferentially along the burner body, and a second partition connected between the at least two first partitions. Each first partition abuts against the cover plate and surrounds the cover plate and the burner body to form the air inlet. The gas passage is formed between the first partitions of adjacent silencers that are close to each other.

4. The outer ring flame cap as described in claim 3, characterized in that, The silencing section also includes a third partition for dividing the partition cavity into a silencing cavity and a damping cavity along the circumference of the flame cap body. The third partition has a communication port for connecting the silencing cavity and the damping cavity.

5. The outer ring flame cap as described in claim 4, characterized in that, In the circumferential direction of the flame cap body, the width of the damping cavity is greater than the width of the silencing cavity.

6. The outer ring flame cap as described in claim 4, characterized in that, The second partition plate has a pressure relief port in the portion corresponding to the damping cavity, which is used to connect the damping cavity and the gas chamber.

7. The outer ring flame cap as described in claim 6, characterized in that, The pressure relief port is connected to the air outlet.

8. The outer ring flame cap as described in claim 3, characterized in that, The second partition and the cover plate are spaced apart axially on the flame cap body to form the air outlet.

9. The outer ring flame cap as described in claim 2, characterized in that, The flame cap body is provided with a connecting post in the area corresponding to the cover plate. The cover plate and the connecting post are respectively provided with a first connecting hole and a second connecting hole corresponding to the first connecting hole. Fasteners are inserted into the first connecting hole and the second connecting hole and are fixedly connected to the connecting post to fix the cover plate to the flame cap body.

10. A burner, characterized in that, Includes the outer ring fire cap as described in any one of claims 1 to 8.

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