Combustor

Abstract

The invention discloses a burner which comprises a furnace end assembly provided with an annular concave cavity with an upward opening and a plurality of vertical ventilation openings formed in the circumferential direction at intervals. The outer fire cover is arranged at the top of the furnace end assembly, a fire hole part is arranged on the outer side wall of the outer fire cover, the outer fire cover and the annular concave cavity are enclosed to form an annular premixing cavity, the annular premixing cavity is respectively communicated with the fire hole part and the vertical air vent, and the vertical air vent is positioned on the radial outer side of an inlet of the fire hole part. According to the burner, airflow can be prevented from directly impacting the root of the fire hole part, so that flames are more uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and particularly to a burner. Background Art

[0002] In the burners on the market, the inner gas outlet directly faces the fire holes, which will cause a large amount of gas to flow out at the gas passage, making the flame uneven, especially for forced-draft burners. Forced-draft burners are divided into those that blow primary air and those that blow secondary air. Among them, for the burner that blows primary air, after blowing primary air, the pressure inside the burner is relatively high, and the gas outlet speed at each cross-section is fast. Therefore, the gas outlet speed at the fire holes is also relatively fast. Especially at the main fire holes near the gas passage, the area of the fire holes is relatively large, and the gas outlet volume will be even larger, resulting in uneven flames. In addition, due to the large amount of gas flowing out at the gas outlet, there is often a relatively large combustion noise. Summary of the Invention

[0003] The present invention aims to solve at least one of the problems existing in the related prior art to some extent. For this purpose, the present invention provides a burner that can avoid the air flow directly hitting the root of the fire hole part and make the flame more uniform.

[0004] According to the above-provided burner, it is realized through the following technical solutions:

[0005] A burner includes: a burner head assembly provided with an upwardly open annular cavity and a plurality of vertically arranged air vents circumferentially spaced apart; and an outer fire cover disposed on the top of the burner head assembly. A fire hole part is provided on the outer side wall of the outer fire cover. The outer fire cover and the annular cavity enclose an annular premixing cavity, and the annular premixing cavity is respectively communicated with the fire hole part and the vertically arranged air vents. The vertically arranged air vents are located radially outside the inlet of the fire hole part.

[0006] In some embodiments, the fire hole part is an annular fire groove, the annular fire groove is inclined in the vertical direction, and the diameter of the annular fire groove gradually decreases along the gas outlet direction; and / or a guiding surface is provided at a position on the outer cavity wall surface of the annular premixing cavity corresponding to the vertically arranged air vents, and the guiding surface is used to guide the air flow to the bottom of the outer fire cover.

[0007] In some embodiments, the annular fire groove has an upper groove wall surface and a lower groove wall surface arranged oppositely, and the slope of the upper groove wall surface is smaller than the slope of the lower groove wall surface.

[0008] In some embodiments, the inclination angle of the upper groove wall surface is 30 - 45°, and the inclination angle of the lower groove wall surface is 32 - 50°.

[0009] In some embodiments, the annular premixing chamber includes a lower mixing chamber and an upper mixing chamber located inside the top of the lower mixing chamber. The upper and lower ends of the upper mixing chamber are respectively communicated with the flame holes and the radial inner end of the top of the lower mixing chamber. The radial outer end of the bottom of the lower mixing chamber is communicated with the vertical air vent; a first flame stabilizing groove is provided on the outer side wall of the outer fire cover below the flame holes. The outer fire cover is provided with a group of flame stabilizing holes located around the upper mixing chamber. The upper end of the group of flame stabilizing holes is communicated with the first flame stabilizing groove, and the lower end penetrates through the bottom of the outer fire cover and is communicated with the radial outer end of the top of the lower mixing chamber, wherein the group of flame stabilizing holes includes a plurality of outer flame stabilizing holes arranged at circumferential intervals.

[0010] In some embodiments, a second flame stabilizing groove is further provided on the outer side wall of the outer fire cover between the flame holes and the first flame stabilizing groove. The outer fire cover is further provided with a group of shunt holes located between the upper mixing chamber and the group of flame stabilizing holes. The upper end of the group of shunt holes is communicated with the second flame stabilizing groove, and the lower end penetrates through the bottom of the outer fire cover and is communicated with the lower mixing chamber, wherein the group of shunt holes includes a plurality of inner flame stabilizing holes arranged at circumferential intervals.

[0011] In some embodiments, the diameter of the second flame stabilizing groove is larger than that of the first flame stabilizing groove, and the diameter of the inner flame stabilizing holes is larger than that of the outer flame stabilizing holes; the diameter of the first flame stabilizing groove is 0.6 - 1.5 mm, and the diameter of the second flame stabilizing groove is 0.8 - 1.5 mm.

[0012] In some embodiments, an inner blocking portion extending outward is integrally formed on the radial inner side wall surface of the vertical air vent. An outer air vent gap is left between the free end of the inner blocking portion and the radial outer side wall surface of the vertical air vent. The outer air vent gap is located radially outside the entrance of the flame holes.

[0013] In some embodiments, an outer blocking portion extending inward is integrally formed on the radial outer side wall surface of the vertical air vent. An inner air vent gap is left between the free end of the outer blocking portion and the radial inner side wall surface of the vertical air vent. The inner air vent gap is arranged in a staggered manner with the outer air vent gap.

[0014] In some embodiments, the burner head assembly is further provided with a plurality of air channels located below the annular premixing chamber and arranged at circumferential intervals. The air channels and the vertical air vents are arranged in a staggered manner along the circumferential direction of the burner head assembly; and / or the burner head assembly is further provided with an outer ring air inlet, a connecting channel and an annular air chamber located below the annular premixing chamber. The radial inner end of the annular air chamber is communicated with the outer ring air inlet through the connecting channel, and the radial outer end is respectively communicated with a plurality of the vertical air vents.

[0015] In some embodiments, the annular air cavity includes an inner annular cavity and an outer annular cavity located outside the inner annular cavity. The height of the inner annular cavity is greater than that of the outer annular cavity. The outer air inlet communicates with the inner annular cavity through the connecting channel, and the inner annular cavity communicates with a plurality of the vertical air vents through the outer annular cavity.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. For the burner of the present invention, an annular premixing cavity is formed between the burner head assembly and the outer burner cap. The annular premixing cavity communicates with the flame holes of the outer burner cap and a plurality of vertical air vents of the burner head assembly respectively. The flame holes are arranged radially inside the plurality of vertical air vents, so that the outlets of the vertical air vents are arranged out of alignment with the inlets of the flame holes, ensuring that the vertical air vents deviate from the inlets of the flame holes, so that the air flow flowing upward from the vertical air vents does not directly impact the roots of the flame holes, changing the air flow direction and reducing the air flow velocity at the flame holes, so as to make the pressure inside the annular premixing cavity more uniform and the flame at the outer burner cap more uniform.

[0018] 2. By providing a guiding surface at the position of the outer cavity wall of the annular premixing cavity corresponding to the vertical air vents, the guiding surface is used to divert the air flow to the bottom of the outer burner cap, so that the air flow flows into the interior of the annular premixing cavity after being buffered by the guiding surface, and the pressure distribution is more uniform.

[0019] 3. By designing the annular fire groove of the outer burner cap to be inclined in the vertical direction and the diameter of the annular fire groove gradually decreasing along the air outlet direction, on the one hand, the air flow is smoother when flowing through the annular fire groove, on the other hand, the flue gas can be effectively reduced, which is beneficial to reducing the requirement of the primary air coefficient of the burner, making the combustion more stable and facilitating the improvement of the thermal efficiency. On the third hand, it is not easy to have flashback and can effectively reduce the extinguishing noise.

[0020] 4. By providing a first flame stabilizing structure and a second flame stabilizing structure on the outer burner cap, the second flame stabilizing structure is located between the first flame stabilizing structure and the annular fire groove. On the one hand, the flame is made more stable and the probability of flashback is further reduced. On the second hand, the annular fire groove is shunted. On the third hand, through the cooperation of the first flame stabilizing structure, the second flame stabilizing structure and the annular fire groove, the problems of large combustion noise and abnormal noise are effectively solved, so that the burner can be applied to two different types of burners, namely, the forced-draft type and the natural-draft type. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of the burner in Embodiment 1 of the present invention;

[0022] Figure 2 is a structural schematic diagram of the burner in Embodiment 1 of the present invention;

[0023] Figure 3 is a cross-sectional view of the burner in Embodiment 1 of the present invention;

[0024] Figure 4 is an exploded view of the burner body and the burner upper cover in Embodiment 1 of the present invention;

[0025] Figure 5 is a sectional view of the burner body and the burner upper cover in Embodiment 1 of the present invention Figure 1 ;

[0026] Figure 6 is a sectional view of the burner body and the burner upper cover in Embodiment 1 of the present invention Figure 2 ;

[0027] Figure 7 is a sectional view of the burner body and the burner upper cover in Embodiment 1 of the present invention Figure 3 ;

[0028] Figure 8 is a schematic structural view of the outer fire cover in Embodiment 1 of the present invention;

[0029] Figure 9 is a sectional view of the outer fire cover in Embodiment 1 of the present invention;

[0030] Figure 10 is an exploded view of the outer fire cover and the sub - burner in Embodiment 1 of the present invention;

[0031] Figure 11 is a schematic structural view of the burner assembly with the sub - burner hidden in Embodiment 2 of the present invention;

[0032] Figure 12 is a sectional view of the burner in Embodiment 2 of the present invention;

[0033] Figure 13 is a sectional view of the sub - burner and the outer fire cover in Embodiment 3 of the present invention;

[0034] Figure 14 is a sectional view of the burner in Embodiment 4 of the present invention.

[0035] In the figure: 1 - burner body, 111 - central cavity, 112 - concave cavity, 121 - inner - ring air inlet, 122 - outer - ring air inlet, 13 - connection channel, 131 - drainage surface, 14 - air storage cavity, 15 - positioning groove;

[0036] 2 - burner upper cover, 201 - upper concave cavity, 211 - inner - ring air outlet, 212 - outer - ring air outlet, 22 - annular air cavity, 221 - inner - ring cavity, 222 - outer - ring cavity, 23 - partition part, 231 - ventilation gap, 24 - positioning post, 251 - outer blocking part, 252 - inner ventilation gap;

[0037] 3 - Divider, 31 - Annular premixing chamber, 311 - Lower mixing chamber, 312 - Upper mixing chamber, 32 - Air inlet hole, 33 - Premixing concave cavity, 331 - Flow - guiding surface, 341 - Inner blocking part, 342 - Outer ventilation gap, 35 - Air channel, 36 - Connecting hole;

[0038] 4 - Upper burner cap, 41 - Annular top plate, 411 - Ignition hole, 412 - Upper groove wall surface, 413 - Limiting step, 42 - Annular side plate;

[0039] 5 - Lower burner cap, 512 - Annular fire trough, 52 - Lower groove wall surface, 531 - First flame - stabilizing trough, 532 - Outer flame - stabilizing hole, 541 - Second flame - stabilizing trough, 542 - Inner flame - stabilizing hole, 55 - Fixed column;

[0040] 6 - Inner burner cap. Specific embodiments

[0041] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or making equivalent substitutions for some technical features without departing from the spirit of the present invention shall all be covered within the scope of the technical solutions claimed by the present invention.

[0042] Embodiment 1

[0043] Referring to Figures 1-3 , this embodiment discloses a burner, including a burner head assembly, an outer burner cap, and an inner burner cap 6. The burner head assembly is provided with an inner - ring air passage opening upward, an air chamber opening upward, an annular concave cavity 33 opening upward, and a plurality of vertical ventilation openings arranged at circumferential intervals. The air chamber is arranged between the inner - ring air passage and the annular concave cavity 33, and the plurality of vertical ventilation openings are all communicated with the annular air cavity 33. Both the outer burner cap and the inner burner cap 6 are arranged on the top of the burner head assembly, and the inner burner cap 6 is communicated with the inner - ring air passage. A fire - hole part is arranged on the outer side wall of the outer burner cap, and the fire - hole part is an annular fire trough 512 or a plurality of main fire holes arranged at circumferential intervals. An ignition part communicating with the fire - hole part is arranged on the top of the outer burner cap, and the ignition part includes a plurality of ignition holes 411 arranged at intervals. The outer burner cap and the annular concave cavity 33 enclose an annular premixing chamber 31, and the annular premixing chamber 31 is respectively communicated with the fire - hole part and the plurality of vertical ventilation openings. The plurality of vertical ventilation openings are all located radially outside the inlet of the fire - hole part, so that the outlet of the vertical ventilation opening is misaligned with the inlet of the fire - hole part, ensuring that the vertical ventilation opening deviates from the inlet of the fire - hole part, preventing the air flow flowing upward from the vertical ventilation opening from directly hitting the root of the fire - hole part, and being beneficial to improving the uniformity of the flame.

[0044] Referring to Figures 1-7, the burner head assembly includes a burner head body and a burner divider 3 arranged on the top of the burner head body. The burner head body includes a burner head main body 1 and a burner head upper cover 2. The burner head upper cover 2 is arranged between the burner divider 3 and the burner head main body 1 and is fixedly connected to the burner head main body 1. The burner head main body 1 is provided with a central cavity 111 with an upward opening. At the lower end of the burner head main body 1, an inner ring air inlet 121 and an outer ring air inlet 122 which are arranged horizontally side by side at intervals are opened. The central cavity 111 is communicated with an inner ring ejector pipe through the inner ring air inlet 121, and the outer ring air inlet is communicated with an outer ring ejector pipe. The burner head upper cover 2 is provided with an inner ring air outlet 211 and a plurality of outer ring air outlets 212. The inner ring air outlet 211 is communicated with the upper end of the central cavity 111 to form an inner ring air passage (not shown in the figure). The plurality of outer ring air outlets 212 are circumferentially and evenly spaced around the inner ring air outlet 211. The burner divider 3 is provided with a premixing concave cavity 33 with an upward opening. At the position of the burner divider 3 corresponding to the outer ring air outlet 212, an air inlet hole 33 is opened. The upper and lower ends of the air inlet hole 33 are respectively communicated with the premixing concave cavity 33 and the corresponding outer ring air outlet 212. Among them, the communicated air inlet hole 33 and the outer ring air outlet 212 together form a vertical air vent.

[0045] In this embodiment, the burner head upper cover 2 and the burner head main body 1 enclose to form an annular air cavity 22 which is located outside the inner ring air passage and is airtight. The radially inner end of the annular air cavity 22 is communicated with the outer ring air inlet 122, and the radially outer end is respectively communicated with a plurality of outer ring air outlets 212. Thus, the outer ring gas first flows from the outer ring air inlet 122 to the radially inner end of the annular air cavity 22 to form static pressure, then flows along the annular air cavity 22 towards its radially outer end, and finally flows upward from each outer ring air outlet 212, so as to ensure that the pressure at the radially outer end of the annular air cavity 22 and each outer ring air outlet is uniform, ensure that the pressure of the air flow flowing into the annular premixing cavity 31 is uniform, so that the outer ring flame reaches a uniform state, which is beneficial to reducing combustion noise, and in addition, it will not affect the secondary air supply of the burner.

[0046] Reference Figures 1-3 and Figures 8-10, the outer burner cap includes an upper burner cap 4 and a lower burner cap 5. The upper burner cap 4 includes an annular top plate 11 and an annular side plate 12 extending downward from the radial inner side of the annular top plate 11. The annular top plate 11 and the annular side plate 12 are integrally formed. An ignition part is provided on the annular top plate 11, and the ignition part includes a plurality of ignition holes 111 arranged at intervals; the lower burner cap 5 is arranged below the upper burner cap 4 and is located outside the upper burner cap 4. An annular fire groove 512 forming a fire hole part is formed between the upper burner cap 4 and the lower burner cap 5. During installation, the upper burner cap 4 and the lower burner cap 5 are respectively arranged on the inner and outer cavity walls of the premixing cavity 33. The lower burner cap 5 is fixedly connected to the fuel divider 3 of the burner assembly. An annular premixing cavity 31 is formed between the lower burner cap 5 and the fuel divider 3 of the burner assembly. In this embodiment, a limiting step 413 is provided at the bottom of the annular top plate 41 and is arranged close to the annular side plate 42. The limiting step 413 is formed by the radial inner side of the bottom of the annular top plate 41 and is used to cooperate with and abut against the inner ring wall of the fuel divider 3 of the burner assembly, so as to stably and reliably place the upper burner cap 4 on the top of the fuel divider of the burner.

[0047] Reference Figures 8-10 , in this embodiment, the fire hole part is preferably an annular fire groove 512. The annular fire groove 512 is arranged obliquely in the vertical direction, and the caliber of the annular fire groove 512 gradually decreases along the gas outlet direction. In this way, on the one hand, the air flow is smoother when flowing through the annular fire groove, and on the other hand, the flue gas can be effectively reduced, thereby facilitating the reduction of the primary air coefficient requirement of the burner, having a low air volume requirement for the forced-draft burner, more stable combustion, facilitating the improvement of thermal efficiency, and on the third hand, not easily experiencing flashback and being able to effectively reduce the extinguishing noise; and / or a guiding surface 331 is provided at the position of the outer cavity wall surface of the annular premixing cavity 31 corresponding to the vertical air vent (see Figure 3 ), and the guiding surface 331 is arranged obliquely upward from the vertical air vent to the inside of the annular premixing cavity, and is used to divert the air flow to the bottom of the lower burner cap 5 of the outer burner cap, so that the air flow flows into the inside of the annular premixing cavity 31 after being buffered by the guiding surface, and the pressure distribution is more uniform.

[0048] Reference Figure 9, the annular fire trough 512 has an upper trough wall surface 412 and a lower trough wall surface 52 arranged oppositely. The slope of the upper trough wall surface 412 is smaller than that of the lower trough wall surface 52, so that the inclination angles of the upper trough wall surface and the lower trough wall surface are different, preventing the air flow from being intercepted, ensuring a smoother air flow, and effectively reducing the flue gas. In this embodiment, the inclination angle of the upper trough wall surface 412 is 30 - 45°, preferably 40°, and the inclination angle of the lower trough wall surface 52 is 32 - 50°, preferably 42°. In this way, it is beneficial to reduce the flue gas and avoid high flue gas caused by a large inclination angle. Secondly, it is ensured that the inlet area of the annular fire trough 512 is slightly larger than its outlet area, enabling the annular fire trough to play a role in reducing the probability of flashback and the noise of flameout. It should be specifically noted that when the area difference between the inlet and the outlet of the annular fire trough 512 is too large, which is equivalent to the depth of the annular fire trough having no effect, there will be a large noise of flameout when turning off the fire under conditions such as flashback limit gas or low pressure.

[0049] Reference Figures 1-3 and Figures 8-9 , the annular premixing chamber 31 includes a lower mixing chamber 311 and an upper mixing chamber 312 located inside the top of the lower mixing chamber 311. The upper and lower ends of the upper mixing chamber 312 are respectively connected to the fire hole part and the radial inner end of the top of the lower mixing chamber 311. The radial outer end of the bottom of the lower mixing chamber 311 is connected to the vertical ventilation port. In this way, the air flow flowing upward from the vertical ventilation port first flows into the lower mixing chamber 311, then flows inward along the lower mixing chamber 311, and then flows upward through the upper mixing chamber 312 into the fire hole part, extending the air flow path, being beneficial to improving the mixing uniformity, and at the same time effectively preventing the air flow from directly hitting the root of the fire hole part, so that the outer ring flame is uniform and beautiful.

[0050] Reference Figures 8-9 , on the outer side wall of the outer fire cap, there is a first flame stabilizing trough 531 located below the fire hole part. The outer fire cap is provided with a group of flame stabilizing holes located outside the upper mixing chamber 312. In this embodiment, both the first flame stabilizing trough and the group of flame stabilizing holes are arranged on the lower fire cap 5 of the outer fire cap. The upper end of the group of flame stabilizing holes is connected to the first flame stabilizing trough 531, and the lower end penetrates through the bottom of the lower fire cap of the outer fire cap and is connected to the radial outer end of the top of the lower mixing chamber 311. The group of flame stabilizing holes includes a plurality of outer flame stabilizing holes 532 arranged at circumferential intervals, and these outer flame stabilizing holes are arranged vertically or inclined in the vertical direction. Thus, the group of flame stabilizing holes and the first flame stabilizing trough together constitute the first flame stabilizing structure, which is beneficial to improving the flame stability and combustion thermal efficiency. Since the group of flame stabilizing holes is separated from the upper mixing chamber 312, it prevents the gas at the inlet of the group of flame stabilizing holes from interfering with the gas at the inlet of the annular fire trough, being beneficial to ensuring the uniformity and beauty of the flame of the annular slit fire.

[0051] Reference Figures 8-9, a second flame stabilizing groove 541 is further provided on the outer side wall of the outer fire cap between the fire hole part and the first flame stabilizing groove 531. The outer fire cap is also provided with a shunt hole group between the upper mixing chamber 312 and the flame stabilizing hole group. In this embodiment, both the second flame stabilizing groove and the shunt hole group are arranged on the lower fire cap 5 of the outer fire cap. The upper end of the shunt hole group communicates with the second flame stabilizing groove 541, and the lower end penetrates through the bottom of the lower fire cap 5 of the distributor cap and communicates with the lower mixing chamber 311. The shunt hole group includes a plurality of inner flame stabilizing holes 542 arranged at circumferential intervals, and the inner flame stabilizing holes are arranged obliquely upward from the inside to the outside to facilitate better shunting of the gas. Thus, the shunt hole group and the second flame stabilizing groove together constitute a second flame stabilizing structure. On the one hand, it further helps to enhance the flame stability and further reduce the probability of flashback. On the other hand, it realizes the shunting of the gas at the annular fire groove to prevent the gas outlet speed at the annular fire groove from being too fast. On the third hand, through the cooperation of the first flame stabilizing structure, the second flame stabilizing structure and the annular fire groove, the problems of large combustion noise and abnormal noise are effectively solved, so that the outer fire cap can be applied to both blow - type and non - blow - type burners. It should be noted that in other embodiments, the second flame stabilizing structure of the outer fire cap can be omitted, so that the overall structure of the outer fire cap is simpler, more convenient for rapid processing and forming, and the manufacturing cost is lower. At this time, the outer fire cap is only applicable to non - blow - type burners.

[0052] Specifically, the diameter H2 of the second flame stabilizing groove 541 is larger than the diameter H1 of the first flame stabilizing groove 531, and the diameter of the inner flame stabilizing hole 542 is larger than the diameter of the outer flame stabilizing hole 532; the diameter of the first flame stabilizing groove 531 is 0.6 - 1.5 mm, and the diameter of the second flame stabilizing groove 541 is 0.8 - 1.5 mm. In this embodiment, the diameter H1 of the first flame stabilizing groove is 0.6 - 1.5 mm, preferably 0.8 mm, and the diameter H2 of the second flame stabilizing groove is 0.8 - 1.5 mm, preferably 1 mm. Both the outer flame stabilizing hole and the inner flame stabilizing hole are circular fire holes, which are convenient for controlling the gas output, have strong manufacturability, and stable and reliable processing.

[0053] Reference Figures 8-10 , a plurality of fixing columns 25 extending downward are circumferentially arranged at intervals on the bottom of the lower fire cap 2. The fixing columns 25 are used for connecting and fixing with the distributor 3 of the burner assembly, so as to stably and reliably install the lower fire cap on the outer ring wall of the distributor 3.

[0054] Reference Figures 1-7, the burner head assembly is further provided with a plurality of air channels 35 which are located below the annular premixing chamber 31 and arranged at circumferential intervals. The air channels 35 and the vertical air vents are arranged in a staggered manner along the circumferential direction of the burner head assembly. In this embodiment, the plurality of air channels 35 are circumferentially arranged at intervals between the burner 3 and the burner head upper cover 2. The opposite ends of the air channel 35 are respectively communicated with the air cavity and the external air to supplement secondary air for the combustion of the inner burner cap; and / or the burner head assembly is further provided with an outer ring air inlet 122, a connecting channel 13 and an annular air cavity 22 located below the annular premixing chamber. The radially inner end of the annular air cavity 22 is communicated with the outer ring air inlet 122 through the connecting channel 13, and the radially outer end is respectively communicated with a plurality of vertical air vents, so that the outer ring gas flows from the outer ring air inlet 122 to the radially inner end of the annular air cavity 22 to form static pressure, then flows along the annular air cavity 22 towards its radially outer end, and finally flows upward into the annular premixing chamber from each vertical air vent, ensuring that the pressure inside the annular premixing chamber 31 is uniform when the air flow enters, so that the flame reaches a uniform state, which is beneficial to reducing combustion noise, and in addition, it will not affect the secondary air supply of the burner.

[0055] Reference Figure 4 , in this embodiment, the connecting channel 13 has a drainage surface 131, and the drainage surface 131 is arranged obliquely upward from the outer ring air inlet 122 towards the central axis of the annular air cavity 22, and the opposite sides of the upper end of the drainage surface 131 are respectively arranged on the opposite outer sides of the central cavity 111, so as to facilitate the rapid and smooth drainage of the outer ring gas to the radially inner side of the annular air cavity 22, and at the same time increase the communication area between the connecting channel 13 and the annular air cavity 22, which is beneficial to the rapid overflow of the outer ring gas and filling of the radially inner end of the annular air cavity.

[0056] Reference Figures 3-5 , in this embodiment, a lower concave cavity 112 with an upward opening and located outside the central cavity 11 is recessed at the top of the burner head body 1. Correspondingly, an upper concave cavity 201 with a downward opening and located outside the inner ring air outlet 211 is recessed at the bottom of the burner head upper cover 2. When the burner head upper cover 2 is connected and fixed to the top of the burner head body 1, the upper concave cavity 201 and the lower concave cavity 112 enclose a closed annular air cavity 22. In other embodiments, the upper concave cavity 201 can be omitted. At this time, the annular air cavity 22 is formed by the enclosure of the lower concave cavity 112 and the bottom surface of the burner head upper cover 2; or the lower concave cavity can be omitted. At this time, the annular air cavity is formed by the enclosure of the upper concave cavity 201 and the top surface of the burner head body 1.

[0057] Specifically, the annular gas cavity 2222 includes an inner ring cavity 221 and an outer ring cavity 222 located outside the inner ring cavity 221. The height H3 of the inner ring cavity 221 is greater than the height H4 of the outer ring cavity 222. The outer ring air inlet 122 communicates with the inner ring cavity 221 through a connecting channel 13. The inner ring cavity 221 communicates with a plurality of vertical air vents through the outer ring cavity 222, so as to ensure smooth flow of the outer ring gas in the annular gas cavity 22. At the same time, the volume of the inner ring cavity 221 can be appropriately reduced, which is beneficial to reducing the probability of flameout noise. In addition, since the height and cross-section of each part of the outer ring cavity 222 are the same, the flow velocity of the outer ring gas flowing through each part of the outer ring cavity 22 is the same, so as to ensure the same outer ring gas flow rate, and further ensure the same air output of each vertical air vent.

[0058] More specifically, the height of the outer ring cavity 222 is 7-9 mm; and / or the bottom surface of the inner ring cavity 221 is lower than the bottom surface of the outer ring cavity 222, and the top surface of the inner ring cavity 221 is lower than or flush with the top surface of the outer ring cavity 222. In this embodiment, the top surface of the upper concave cavity 201 is a plane, and the radially inner end of the bottom surface of the lower concave cavity 112 is lower than the radially outer end of the bottom surface of the lower concave cavity 112, so that the annular gas cavity 22 formed by enclosing the upper concave cavity 201 and the lower concave cavity 112 has a large height at the inner end and a small height at the outer end, that is, the height H3 of the inner ring cavity 221 is greater than the height H4 of the outer ring cavity 222, preventing the air flow from being unsmooth.

[0059] Reference Figure 7 , a gas storage cavity 14 is provided at a position of the burner head assembly away from the inlet of the outer ring air inlet 122. In this embodiment, the gas storage cavity 14 is arranged on the burner head body 1. The outlet ends of the outer ring air inlet 122 communicate with the gas storage cavity 14 and the inlet of the connecting channel 13 respectively. By providing the gas storage cavity 14, the air flow is buffered, so that the pressure distribution is more uniform, and it is avoided that the air flow flowing in from the outer ring air inlet 122 rebounds after hitting the wall and diffuses everywhere, resulting in unsmooth air flow.

[0060] Reference Figures 4-7 , a plurality of partition parts 23 are arranged at circumferential intervals at the radially outer end of the annular gas cavity 22. The partition parts 23 are arranged in the radial direction and are fixedly connected to the burner head body 1 or the burner head upper cover 2. An air distribution channel (not shown in the figure) is formed between two adjacent partition parts 23, and the radially inner ends of two adjacent air distribution channels are connected. The outer ring air inlet 122 is arranged between two adjacent partition parts 23 and communicates with the radially outer end of the corresponding air distribution channel. Thus, after the outer ring gas is guided to the radially inner end of the annular gas cavity, it then flows uniformly along the air distribution channel to the corresponding outer ring air outlet, ensuring uniform pressure at each outer ring air outlet.

[0061] In this embodiment, a plurality of partition parts 23 are circumferentially and evenly spaced in the outer ring cavity 222 of the annular air cavity, and are integrally formed with the upper cover 2 of the burner head. An air vent gap 231 is formed between the partition part 23 and the burner head body 1, and adjacent two air distribution channels are connected through the air vent gap 231. In other embodiments, the radially outer ends of adjacent two air distribution channels may not be connected. At this time, the partition part 23 abuts against the top of the burner head body; or the partition part 23 is integrally formed on the burner head body 1. At this time, an air vent gap 231 may be formed between the partition part 23 and the upper cover 2 of the burner head. Of course, the partition part 23 may also be designed to abut against the upper cover of the burner head.

[0062] Reference Figures 3-6 , a plurality of positioning structures (not shown in the figure) which are circumferentially spaced are provided between the upper cover 2 of the burner head and the burner head body 1 in the annular air cavity 22, so as to quickly pre-position the upper cover 2 of the burner head on the burner head body 1 and prevent the upper cover 2 of the burner head from shifting relative to the burner head body. In this embodiment, the positioning structure includes a positioning post 24 and a positioning groove 15 which are cooperatively inserted. The positioning post 24 is integrally formed and protrudes from the partition part 23 of the upper cover 2 of the burner head, and the positioning groove 15 is recessed at the position of the burner head body 1 corresponding to the positioning post 24.

[0063] Embodiment 2

[0064] Reference Figures 11-12 , the difference between this embodiment and Embodiment 1 is that an inner blocking part 341 is added in each vertical air vent. Specifically, an inner blocking part 341 which extends outward is integrally formed and protrudes from the radial inner side wall surface of the vertical air vent. An outer air vent gap 342 is left between the free end of the inner blocking part 341 and the radial outer side wall surface of the vertical air vent. The outer air vent gap 342 is located radially outside the inlet of the flame hole part. In this embodiment, the inner blocking part 341 is integrally formed on the upper cover 2 of the burner head assembly of the burner head assembly, that is, an inner blocking part 341 which extends outward is protruded from the radial inner wall surface at the upper end of each outer ring air outlet 212 of the upper cover 2 of the burner head. An outer air vent gap 342 for the air flow to pass through is left between the radially outer end of the inner blocking part 341 and the radially outer wall surface of the outer ring air outlet 212. It should be particularly noted that when the inner blocking part 341 is added at the outer ring air outlet 212, the diffuser 3 of the burner head assembly can be omitted, or the diffuser 3 and the upper cover 2 of the burner head can be integrally formed.

[0065] Thus, when the outer ring gas flows upward from the vertical air vent, part of the air flow is buffered after passing through the added inner blocking part 341 and then flows toward the radial outside, so that the outer ring gas flowing out of the vertical air vent is more offset outward, further making the air flow more uniform and facilitating effective reduction of combustion noise.

[0066] It can be seen that by adding an inner blocking portion 341 at the vertical vent, the airflow is more deflected outwards, preventing the outer-ring gas from directly flushing the root of the annular fire trough, which is beneficial to improving the air distribution effect, making the flame more stable, and at the same time more conducive to reducing the whistling sound and flue gas, and is more suitable for a forced-draft burner.

[0067] Embodiment 3

[0068] Reference Figure 13 , the difference between this embodiment and Embodiment 2 lies in that the specific setting positions of the inner blocking portion 341 and the outer ventilation gap 342 are different. In this embodiment, the inner blocking portion 341 is integrally formed on the burner 3 of the burner head assembly, that is, an inner blocking portion 341 extending outwards is convexly provided on the radial inner wall surface of each air inlet hole 32 of the burner 3, and an outer ventilation gap 342 for the airflow to pass through is left between the radially outer end of the inner blocking portion 341 and the radially outer wall surface of the air inlet hole 32.

[0069] Embodiment 4

[0070] Reference Figure 14 , the difference between this embodiment and Embodiment 1 lies in that an inner blocking portion 341 and an outer blocking portion 251 are added in each vertical vent. Specifically, an inner blocking portion 341 extending outwards is integrally formed and convexly provided on the radial inner wall surface of the vertical vent. An outer ventilation gap 342 is left between the free end of the inner blocking portion 341 and the radial outer wall surface of the vertical vent, and the outer ventilation gap 342 is located radially outside the entrance of the flame hole portion; an outer blocking portion 251 extending inwards is integrally formed and convexly provided on the radial outer wall surface of the vertical vent. An inner ventilation gap 252 is left between the free end of the outer blocking portion 251 and the radial inner wall surface of the vertical vent, and the inner ventilation gap 252 is arranged in a staggered manner with the outer ventilation gap 342.

[0071] In this embodiment, the inner blocking portion 341 is integrally formed on the burner 3 of the burner head assembly, that is, an inner blocking portion 341 extending outwards is convexly provided on the radial inner wall surface of each air inlet hole 32 of the burner 3, and an outer ventilation gap 342 for the airflow to pass through is left between the radially outer end of the inner blocking portion 341 and the radially outer wall surface of the air inlet hole 32. The outer blocking portion 251 is integrally formed on the upper cover 2 of the burner head of the burner head assembly, that is, an outer blocking portion 251 extending inwards is convexly provided on the radial inner wall surface of the upper end of each outer-ring air outlet 212 of the upper cover 2 of the burner head, and an inner ventilation gap 252 for the airflow to pass through is left between the radially outer end of the outer blocking portion 251 and the radial inner wall surface of the outer-ring air outlet 212.

[0072] Thus, when the outer-ring gas flows upward from the vertical vent, the airflow is buffered after passing through the added outer blocking portion 251 first, then flows toward the inner and outer sides in the radial direction, and is buffered again after passing through the added inner blocking portion 341, and then flows toward the outer side in the radial direction, so that the outer-ring gas flowing out from the vertical vent is more offset outward, further making the airflow more uniform and facilitating the effective reduction of combustion noise at the same time.

[0073] It can be seen that by adding the inner blocking portion 341 and the outer blocking portion 251 at the vertical vent, the airflow is further made more uniform, and the combustion noise and flue gas are further effectively reduced, which is more applicable to the forced-draft burner.

[0074] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A burner, characterized in that: include: The furnace head assembly is provided with an upwardly opening annular cavity (33) and a plurality of vertical air vents arranged at intervals in the circumferential direction; as well as An outer fire cover is arranged on the top of the burner head assembly, and a fire hole portion is provided on the outer side wall of the outer fire cover. The outer fire cover and the annular concave cavity (33) are combined to form an annular premixing chamber (31). The annular premixing chamber (31) is connected to the fire hole portion and the vertical air vent respectively, and the vertical air vent is located radially outside the entrance of the fire hole portion.

2. A burner according to claim 1, characterized in that: The fire hole portion is an annular fire groove (512), the annular fire groove (512) is arranged obliquely in the vertical direction, and the diameter of the annular fire groove (512) gradually decreases along the gas outlet direction; and / or a guide surface (331) is provided at a position of the outer cavity wall of the annular premixing cavity (31) corresponding to the vertical vent, and the guide surface (331) is used to guide the airflow to the bottom of the outer fire cover.

3. A burner according to claim 2, characterized in that: The annular fire groove (512) has an upper groove wall surface (412) and a lower groove wall surface (52) arranged opposite to each other, and the slope of the upper groove wall surface (412) is smaller than the slope of the lower groove wall surface (52).

4. A burner according to claim 3, characterized in that: The inclination angle of the upper groove wall surface (412) is 30 to 45 degrees, and the inclination angle of the lower groove wall surface (52) is 32 to 50 degrees.

5. A burner according to claim 1, characterized in that: The annular premixing chamber (31) comprises a lower mixing chamber (311) and an upper mixing chamber (312) located on the inner side of the top of the lower mixing chamber (311), the upper and lower ends of the upper mixing chamber (312) are respectively connected to the fire hole portion and the radial inner end of the top of the lower mixing chamber (311), and the radial outer end of the bottom of the lower mixing chamber (311) is connected to the vertical vent; A first flame stabilizing groove (531) located below the fire hole portion is provided on the outer side wall of the outer fire cover, and the outer fire cover is provided with a flame stabilizing hole group located outside the upper gas mixing chamber (312), the upper end of the flame stabilizing hole group is connected to the first flame stabilizing groove (531), and the lower end passes through the bottom of the outer fire cover and is connected to the radial outer end of the top of the lower gas mixing chamber (311), wherein the flame stabilizing hole group includes a plurality of outer flame stabilizing holes (532) arranged circumferentially at intervals.

6. A burner according to claim 5, characterized in that: A second flame stabilizing groove (541) located between the fire hole portion and the first flame stabilizing groove (531) is also provided on the outer side wall of the outer fire cover, and a diverter hole group is also provided between the upper gas mixing chamber (312) and the flame stabilizing hole group, wherein the upper end of the diverter hole group is connected to the second flame stabilizing groove (541), and the lower end passes through the bottom of the outer fire cover and is connected to the lower gas mixing chamber (311), wherein the diverter hole group includes a plurality of inner flame stabilizing holes (542) arranged circumferentially at intervals.

7. A burner according to claim 6, characterized in that: The caliber of the second flame stabilizing groove (541) is larger than the caliber of the first flame stabilizing groove (531), and the diameter of the inner flame stabilizing hole (542) is larger than the diameter of the outer flame stabilizing hole (532); the caliber of the first flame stabilizing groove (531) is 0.6 to 1.5 mm, and the caliber of the second flame stabilizing groove (541) is 0.8 to 1.5 mm.

8. A burner according to claim 1, characterized in that: An inner blocking portion (341) extending outward is integrally formed on the radial inner wall surface of the vertical air vent, and an outer ventilation gap (342) is left between the free end of the inner blocking portion (341) and the radial outer wall surface of the vertical air vent, and the outer ventilation gap (342) is located radially outside the entrance of the fire hole portion.

9. A burner according to claim 8, characterized in that: An outer blocking portion (251) extending inward is integrally formed on the radial outer wall surface of the vertical vent, and an inner ventilation gap (252) is left between the free end of the outer blocking portion (251) and the radial inner wall surface of the vertical vent, and the inner ventilation gap (252) and the outer ventilation gap (342) are arranged in a staggered manner.

10. A burner according to claim 1, characterized in that: The burner head assembly is further provided with a plurality of air passages (35) located below the annular premixing chamber (31) and arranged at intervals in the circumferential direction, wherein the air passages (35) and the vertical air vents are arranged alternately along the circumferential direction of the burner head assembly; and / or The furnace head assembly is also provided with an outer ring air inlet (122), a connecting channel (13) and an annular air cavity (22) located below the annular premixing cavity; the radial inner end of the annular air cavity (22) is connected to the outer ring air inlet (122) via the connecting channel (13), and the radial outer end is respectively connected to the plurality of vertical air vents.

11. A burner according to claim 10, characterized in that: The annular air cavity (22) (22) comprises an inner annular cavity (221) and an outer annular cavity (222) located outside the inner annular cavity (221); the height of the inner annular cavity (221) is greater than the height of the outer annular cavity (222); the outer annular air inlet (122) is connected to the inner annular cavity (221) via the connecting channel (13); and the inner annular cavity (221) is connected to the plurality of vertical air vents respectively via the outer annular cavity (222).

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