An updraft burner

Abstract

The application discloses an upper air inlet burner, which comprises a base assembly and a distributor, wherein the base assembly comprises a supporting table in a circular shape and an air outlet seat, the air outlet seat is arranged outside the supporting table and is fixedly connected with the supporting table, the air outlet seat comprises an outer ring air outlet seat and an inner ring air outlet seat which are arranged in parallel and in the same direction, and the distributor is installed at the top of the supporting table and covers the supporting table and the air outlet seat in orthographic projection respectively, and the distributor is provided with an outer injection pipe and an inner injection pipe which are arranged in parallel and in the same direction at the bottom of the distributor. The upper air inlet burner is beneficial to reducing the volume of the base assembly and solving the problem that the upper air inlet burner is not easy to clean.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of burners, in particular to an updraft burner. BACKGROUND

[0002] The existing updraft burners on the market, in order to solve the problem of nozzle easy to block, mostly adopt the design of external ejector, and the corresponding nozzle seat is exposed on the stove panel, and the nozzle is horizontally arranged. In order to solve the problem of short ejector, low ejector coefficient and poor combustion of the updraft burner, the design of multiple ejectors is usually adopted, and the number of inner and outer ring ejectors reaches more than 3, and the corresponding exposed nozzle seat reaches more than 3. However, too many nozzle seats are exposed on the stove panel, and the nozzle seats are arranged relatively, so that the user is easy to have a cleaning dead angle when cleaning the stove panel, which is not conducive to the cleaning of the stove panel. SUMMARY

[0003] The present application aims to at least solve one of the problems existing in the prior art, and provides an updraft burner which is beneficial to reducing the volume of the base assembly and solving the problem of difficult cleaning of the updraft burner.

[0004] According to the updraft burner provided by the above-mentioned technical scheme, the following technical scheme is adopted:

[0005] An updraft burner comprises a base assembly having a support table in a circular shape and a gas outlet seat, the gas outlet seat being arranged outside the support table and fixedly connected with the support table, the gas outlet seat comprising an outer ring gas outlet seat and an inner ring gas outlet seat arranged in parallel and in the same direction; and a burner installed on the top of the support table and covering the support table and the gas outlet seat in orthographic projection, the burner being provided with an outer ejector pipe and an inner ejector pipe arranged in parallel and in the same direction at the bottom of the burner.

[0006] In some embodiments, the burner has an air cavity opening upward, an annular retaining ring extending downward is integrally formed at the bottom of the air cavity, the bottom surface of the annular retaining ring abuts and fits with the top surface of the support table, and the burner is provided with a channel communicating with the air cavity and located radially outside the annular retaining ring; part or all of the inner ejector pipe and the outer ejector pipe are arranged in the annular retaining ring.

[0007] In some embodiments, the diameter of the support table is greater than or equal to the outer diameter of the annular retaining ring, and is less than the maximum outer diameter of the burner.

[0008] In some embodiments, a plurality of notches are arranged in a circumferential direction at the lower end of the annular retaining ring; and / or the bottom surface of the air cavity is in the shape of a circular truncated cone with a large lower end and a small upper end, and the channel is arranged at the outer cavity wall surface or the lower end of the bottom surface of the air cavity.

[0009] In some embodiments, an annular step extending outward is formed at the lower end of the peripheral wall of the support table, and a plurality of mounting positions are arranged at the annular step in a circumferential direction, and the orthographic projection of the igniter covers the annular step and all the mounting positions.

[0010] In some embodiments, the outer ring gas outlet seat and the inner ring gas outlet seat are arranged in a staggered manner, and the distance between the two is greater than 35 mm; the distance between the outer ejector pipe and the central axis of the igniter is 25-35 mm, and the distance between the inner ejector pipe and the central axis of the igniter is 5-15 mm.

[0011] In some embodiments, two protrusions extending outward and arranged side by side are integrally formed at one end of the support table close to the gas outlet seat, and the two protrusions are integrally formed with the outer ring gas outlet seat and the inner ring gas outlet seat, respectively.

[0012] In some embodiments, the outer ring gas outlet seat is an outer ring gas guide pipe arranged vertically, the outer ring gas guide pipe has an outer ring gas channel arranged vertically, the inner ring gas outlet seat is an inner ring gas guide pipe arranged vertically, and the inner ring gas guide pipe has an inner ring gas channel arranged vertically; and / or a positioning structure is arranged between the igniter and the outer ring gas outlet seat and / or the inner ring gas outlet seat.

[0013] In some embodiments, the lower ends of the outer ring gas guide pipe and the inner ring gas guide pipe both extend downward below the support table; a plurality of support feet extending downward and a connecting arm are integrally formed at the bottom of the support table, and the opposite ends of the connecting arm are integrally formed with the lower ends of the outer ring gas guide pipe and the inner ring gas guide pipe, respectively.

[0014] In some embodiments, an ignition assembly is further included, an assembly hole is arranged at one end of the support table away from the gas outlet seat, an installation hole is arranged at the igniter corresponding to the position of the assembly hole, and the upper and lower ends of the ignition assembly are vertically arranged in the installation hole and the assembly hole, respectively.

[0015] In some embodiments, the ignition assembly is provided with a support abutting against the top of the support table, and a pressing part extending towards the support is integrally formed at the bottom of the igniter, and the pressing part tightly presses the support on the top surface of the support table.

[0016] In some embodiments, an inclined surface or an arc surface inclined from bottom to top is formed at the position of the bottom of the annular retainer ring close to the support, and the part of the inclined surface or the arc surface tightly pressing on the support constitutes the pressing part.

[0017] In some embodiments, a clamping groove extending downward and opening downward is integrally formed at the position of the bottom of the igniter corresponding to the support, the clamping groove is configured to be clamped outside the support and tightly press the support on the top surface of the support table, and the pressing part is formed by the clamping groove.

[0018] Compared with the prior art, the present application has at least the following advantages:

[0019] 1. The upper air inlet burner of the present application, by designing the support table of the base assembly as a circle, and only arranging an inner ring air outlet seat and an outer ring air outlet seat in parallel and in the same direction outside the support table, the structure is simple, which is beneficial to reduce the volume of the base assembly, reduce the air outlet seat exposed on the stove panel, reduce the cleaning dead angle, and make cleaning more convenient;

[0020] 2. By arranging a downwardly extending annular retaining ring at the bottom of the distributor, the annular retaining ring is in surface contact with the top surface of the support table of the base assembly, so that the distributor remains horizontal after installation, preventing the distributor from pressing and shaking, and at the same time positioning the ejector of the distributor, ensuring the concentricity of the ejector of the distributor and the nozzle of the base assembly;

[0021] 3. By arranging a channel on the distributor which is in communication with the air cavity and located radially outside the annular retaining ring, the secondary air is supplemented, and at the same time, the overflow liquid in the air cavity flows into the liquid container along the annular retaining ring after being discharged from the channel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is an exploded view of the upper air inlet burner in the embodiment of the present application;

[0023] Figure 2 is a sectional view of the upper air inlet burner in the embodiment of the present application Figure 1 ;

[0024] Figure 3 is a sectional view of the upper air inlet burner in the embodiment of the present application Figure 2 ;

[0025] Figure 4 is a structural schematic view of the base assembly in the embodiment of the present application;

[0026] Figure 5 is a structural schematic view of the base body in the embodiment of the present application;

[0027] Figure 6 is a sectional view of the base assembly in the embodiment of the present application Figure 1 ;

[0028] Figure 7 is a sectional view of the base assembly in the embodiment of the present application Figure 2 ;

[0029] Figure 8 is a structural schematic view of the distributor in the embodiment of the present application Figure 1 ;

[0030] Figure 9 is a structural schematic view of the distributor in the embodiment of the present application Figure 2 ;

[0031] Figure 10is a sectional view of the spark distributor in the embodiment of the present application.

[0032] In the figure: 1-base assembly, 101-base body, 102-outer ring nozzle, 103-inner ring nozzle, 104-air inlet joint, 11-supporting table, 121-outer ring air outlet seat, 1211-outer ring air channel, 122-inner ring air outlet seat, 1221-inner ring air duct, 13-annular step, 131-mounting position, 14-convex, 15-positioning column, 16-supporting leg, 17-connecting arm, 171-supporting part, 18-assembly hole;

[0033] 2-spark distributor, 211-outer ejection pipe, 212-inner ejection pipe, 221-air cavity, 222-outer ring air cavity, 223-inner ring air cavity, 2231-center protrusion, 2232-upper fixing hole, 2233-lower groove, 2234-stop part, 2235-positioning part, 23-annular stop ring, 2301-first arc segment, 2302-second arc segment, 2303-third arc segment, 231-gap, 24-channel, 25-positioning groove, 26-mounting hole, 27-pressing part;

[0034] 3-ignition assembly, 31-stand; 4-fire cap assembly. DETAILED DESCRIPTION

[0035] The following embodiments are used to illustrate the present application, but the present application is not limited by these embodiments. Modifications to the specific embodiments of the present application or equivalent replacements to some technical features without departing from the spirit of the present application scheme should be covered in the technical scheme range claimed by the present application.

[0036] REFERENCE Figures 1-10 The embodiment provides an updraft combustion burner, which comprises a base assembly 1 and a spark distributor. The base assembly 1 comprises a base body 101, the base body 101 has a supporting table 11 and an air outlet seat (not shown in the figure), the supporting table 11 is circular, the air outlet seat is arranged outside the supporting table 11 and is integrally formed with the supporting table 11, the air outlet seat comprises an outer ring air outlet seat 121 and an inner ring air outlet seat 122 which are arranged in parallel and in the same direction, so that the structure of the base body 101 is simpler, the volume of the base body 101 is reduced, only the outer ring air outlet seat 121 and the inner ring air outlet seat 122 are exposed on the cooktop panel, the exposed air outlet seat and the cleaning dead angle are reduced, and cleaning is more convenient. In addition, by arranging the air outlet seat outside the supporting table 11 and fixedly connecting the air outlet seat with the supporting table 11, the orthographic projection of the outer ring air cavity 222 of the spark distributor 2 can cover the air outlet seat and the nozzle mounted on the air outlet seat, so that the hole diameter of the nozzle is prevented from being blocked by the spilled liquid after the pot overflows.

[0037] The nozzles include outer ring nozzles 102 and inner ring nozzles 103, the outer ring nozzles 102 are horizontally or obliquely installed at the upper end of the outer ring air outlet seat 121, and the air outlet direction of the outer ring nozzles 102 is towards the upper side of the support table 11, the inner ring nozzles 103 are horizontally or obliquely installed at the upper end of the inner ring air outlet seat 122, and the air outlet direction of the inner ring nozzles 103 is towards the upper side of the support table 11. In the embodiment, the outer ring air outlet seat 121 and the inner ring air outlet seat 122 are arranged in a staggered manner, and the distance between the two is greater than 35 mm, which is beneficial to cleaning, so that the air flow flowing when the nozzles inject primary air will not interfere with each other due to too close distance. In addition, the base assembly 1 also includes two air inlet joints 104, which are respectively installed at the lower end of the outer ring air outlet seat 121 and the inner ring air outlet seat 122.

[0038] The distributor 2 is installed at the top of the support table 11, and its orthographic projection covers the support table 11, the air outlet seat and the nozzles installed on the air outlet seat respectively, so that the support table 11, the air outlet seat and the nozzles are hidden at the bottom of the distributor 2, preventing the liquid from blocking the nozzle aperture after the pot overflow. The outer injection pipe 211 and the inner injection pipe 212 are integrally formed at the bottom of the distributor 2 and are arranged in parallel and in the same direction, the inlet of the outer injection pipe 211 is connected with the upper end of the outer ring air outlet seat 121 through the outer ring nozzle 102, and the upper end of the inner injection pipe 212 is connected with the upper end of the inner ring air outlet seat 122 through the inner ring nozzle 103. In the embodiment, the outer injection pipe 211 and the inner injection pipe 212 are respectively located at the opposite outer sides of the central axis of the distributor 2, and the distance between the outer injection pipe 211 and the central axis of the distributor 2 is 25-35 mm, and the distance between the inner injection pipe 212 and the central axis of the distributor 2 is 5-15 mm.

[0039] Reference Figures 1-3 and Figures 8-10, the air cavity 221 is located between the inner ring air cavity 223 and the outer ring air cavity 222, the outer ring air cavity 222 is communicated with the outlet of the outer ejector pipe 211, and the inner ring air cavity 223 is communicated with the outlet of the inner ejector pipe 212. In the embodiment, the orthographic projection of the air cavity 221 and the inner ring air cavity 223 collectively covers the whole of the support table 11, and the outer ring air cavity 222 respectively covers the whole of the nozzle and the whole or most of the gas outlet seat. Further, the cavity bottom surface of the inner ring air cavity 223 is integrally formed with a center protrusion 2231 extending upward, an upward-opening upper fixing hole 2232 is formed at the upper end of the center protrusion 2231 for fixing a gas distribution plate installed on the top of the center protrusion 2231, and a downward-opening lower groove 2233 is formed at the lower end of the center protrusion 2231 for the purpose of saving material and demolding and reducing cost. The inner ring air cavity 223 is integrally formed with a stop portion 2234 between the center protrusion 2231 and the cavity wall surface of the inner ring air cavity 223, the stop portion 2234 is arranged close to the outlet of the inner ejector pipe 212, and is used for making the inner ring gas flowing out of the inner ejector pipe 212 flow to the space between the center protrusion 2231 and the cavity wall surface of the inner ring air cavity 223 in the same direction (for example, counterclockwise direction), so as to reduce the shunting of the inner ring gas. A positioning portion 2235 vertically arranged close to the outlet of the inner ejector pipe 212 is arranged on the top of the stop portion 2234, and is used for pre-positioning the gas distribution plate of the burner, so as to prevent the gas distribution plate from rotating and moving relative to the center protrusion 2231.

[0040] Reference Figures 1-5 The bottom of the air cavity 221 is integrally formed with a downward-extending annular stop ring 23 abutting against the top surface of the support table 11, and in the embodiment, the top surface of the support table 11 is a horizontal surface, which forms a surface contact with the bottom surface of the annular stop ring 23, so as to increase the contact area, keep the igniter 2 horizontal after installation, improve the installation stability and reliability of the igniter 2, prevent the igniter 2 from pressing and shaking, and at the same time, the annular stop ring 23 can position the ejector of the igniter 2, so as to ensure the concentricity between the ejector of the igniter 2 and the nozzle of the base assembly 1.

[0041] A channel 24 is formed on the diffuser 2 and communicates with the air cavity 221 and is located radially outward of the annular baffle 23, so as to facilitate the replenishment of the air cavity 221 with secondary air through the channel 24, and at the same time, after the overflow liquid in the air cavity 221 is discharged from the channel 24, the overflow liquid can flow along the annular baffle 23 into the liquid pan of the burner. In the present embodiment, the bottom surface of the air cavity 221 is in the shape of a circular truncated cone with a large lower end and a small upper end, and includes an inclined section and a flat section, the flat section is integrally formed between the peripheral wall of the inner annular air cavity 223 and the upper end of the inclined section, and the annular baffle 23 extending downward is integrally formed on the lower peripheral edge of the inclined section of the air cavity 221, and the channel 24 is arranged on the outer cavity wall surface of the air cavity 221, so that the secondary air flows upward along the inclined section of the diffuser, which is beneficial to reduce the height of the burner, and at the same time, the secondary air flows upward along the inclined section due to the thermal effect, which is beneficial to the flow of the secondary air and reduces the flow resistance; the overflow liquid falls onto the bottom surface of the air cavity 221 and then flows along the inclined section and the annular baffle 23 into the liquid pan. In other embodiments, the annular baffle 23 can be integrally formed on the lower end of the inclined section of the air cavity 221, and at this time, the channel 24 can be arranged on the lower end of the inclined section of the air cavity 221 and radially outward of the annular baffle 23, so as to further reduce the diameter of the annular baffle 23, and correspondingly, the volume of the support table 11 can be further reduced.

[0042] Further, the diameter of the support table 11 is greater than or equal to the outer diameter of the annular baffle 23 and is less than the maximum outer diameter of the diffuser 2, and in the present embodiment, the outer diameter of the annular baffle 23 is the same as the diameter of the support table 11, so as to ensure that the support table 11 can stably and reliably support the annular baffle 23, while reducing the volume of the base body 101, so that the support table 11 is completely covered by the orthographic projection of the diffuser 2, and the support table 11 is completely hidden at the bottom of the diffuser 2. A plurality of notches 231 are arranged on the lower end of the annular baffle 23 in a circumferential direction, so as to allow air and overflow liquid to pass through while saving materials.

[0043] Reference Figure 10, or all of the inner ejector pipe 212 and the outer ejector pipe 211 are arranged in the annular retaining ring 23. In the embodiment, the annular retaining ring 23 comprises a first arc segment 2301, a second arc segment 2302 and a third arc segment 2303 arranged in a circumferential direction, the first arc segment 2301 is arranged radially outside the inner ejector pipe 212, and one end of the first arc segment 2301 is integrally formed with the gas inlet end of the inner ejector pipe 212, and the other end is integrally formed with the gas outlet end of the outer ejector pipe 211, and the gas outlet end of the inner ejector pipe 212 is arranged in a spaced manner with the first arc segment 2301, so that the first arc segment 2301 can cover most of the inner inner ejector pipe 212. The second arc segment 2302 is arranged radially outside the outer ejector pipe 211, and the opposite ends of the second arc segment 2302 are integrally formed with the gas inlet end and the gas outlet end of the outer ejector pipe 211, respectively, for covering the middle segment of the outer ejector pipe 211. The third arc segment 2303 is integrally formed between the inlet of the inner ejector pipe and the inlet of the outer ejector pipe. A notch 231 is arranged at the lower end of the first arc segment 2301 and the second arc segment 2302, respectively, and a passage 24 is arranged radially outside the first arc segment 2301, the second arc segment 2302 and the third arc segment 2303 to increase the secondary air supplement area and solve the problem that the CO content in the flue gas of the updraft air burner is easy to exceed the standard. Of course, the passage 24 in the third arc segment 2303 can be omitted to avoid the nozzle being blocked by the liquid flowing along the passage 24 near the nozzle.

[0044] Reference Figures 4-7 An annular step 13 extending outward is integrally formed at the lower end of the peripheral wall of the support table 11, in the embodiment, the annular step 13 is a stove panel mounting surface, the top surface of the annular step 13 is 2-3 mm lower than the top surface of the support table 11, and the width of the annular step 13 is 2-3 mm. A plurality of mounting positions 131 arranged in a circumferential direction are arranged on the annular step 13, the mounting positions 131 can be connected with the stove panel through screws, and the orthographic projection of the damper 2 covers the annular step 13 and all the mounting positions 131, so that the mounting positions 131 are closer to the center of the burner and are not exposed outside the damper 2, thereby preventing the panel mounting screws from rusting due to being exposed outside the damper 2 without being shielded.

[0045] In the embodiment, two bosses 14 extending outward and arranged side by side in a spaced manner are integrally formed at one end of the support table 11 close to the gas outlet seat, and the free ends of the two bosses 14 are integrally formed with the outer ring gas outlet seat 121 and the inner ring gas outlet seat 122, respectively. In other embodiments, the two bosses 14 can be omitted.

[0046] Reference Figure 6, the outer ring gas outlet seat 121 is a vertically arranged outer ring gas guide pipe, the outer ring gas guide pipe has a vertically arranged outer ring gas channel 1211, an outer ring gas inlet and an outer ring gas outlet are respectively arranged at the upper and lower ends of the outer ring gas guide pipe and are in communication with the outer ring gas channel 1211, and the outer ring gas outlet is in communication with the outer ejector pipe 211 through the outer ring nozzle 102. It can be seen from Figure 7 , the inner ring gas outlet seat 122 is a vertically arranged inner ring gas guide pipe 1221, the inner ring gas guide pipe 1221 has a vertically arranged inner ring gas channel 1221, an inner ring gas inlet and an inner ring gas outlet are respectively arranged at the upper and lower ends of the inner ring gas guide pipe 1221 and are in communication with the inner ring gas channel, and the inner ring gas outlet is in communication with the inner ejector pipe 212 through the inner ring nozzle 103. It can be seen from

[0047] A positioning structure is arranged between the inner ring gas outlet seat 122 and / or the outer ring gas outlet seat 121 and the distributor 2, so as to position the distributor and prevent the distributor 2 from being eccentrically installed on the base assembly 1. In the embodiment, the positioning structure includes a positioning column 15 and a positioning groove 25 which are matched and inserted, the positioning column 15 is integrally formed on the top of the inner ring gas outlet seat 122 and / or the outer ring gas outlet seat 121, and the positioning groove 25 is concavely arranged on the bottom of the distributor 2 and corresponds to the position of the positioning column 15.

[0048] Reference Figures 4-7 The lower ends of the outer ring gas guide pipe and the inner ring gas guide pipe 1221 extend downward below the support table 11. A plurality of support feet 16 and a connecting arm 17 which extend downward are integrally formed on the bottom of the support table 11, the opposite ends of the connecting arm 17 are integrally formed with the lower ends of the outer ring gas guide pipe and the inner ring gas guide pipe 1221, and in the embodiment, a support portion 171 is integrally formed on the bottom or the outer side wall of the connecting arm 17, the support portion 171 is located between the outer ring gas guide pipe and the inner ring gas guide pipe 1221, and the bottom of each support foot 16 and the bottom of the support portion 171 of the connecting arm 17 are used to contact the bottom shell of the stove. In this way, the connecting arm 17 can serve as the support foot 16 and can also serve to connect and fix the inner and outer gas guide pipes and strengthen the strength of the base body 101.

[0049] Reference Figures 1-10, the burner further comprises an ignition assembly 3, the support table 11 is provided with an assembly hole 18 at one end away from the air outlet seat, the damper 2 is provided with a mounting hole 26 at a position corresponding to the assembly hole 18, the mounting hole 26 is arranged on the bottom surface of the air cavity 221 and is located radially inward of the annular retaining ring 23, and in the embodiment, the mounting hole 26 is arranged radially inward of the first arc segment 2301 of the annular retaining ring 23. The upper and lower ends of the ignition assembly 3 are vertically arranged in the mounting hole 26 and the assembly hole 18 respectively, so that only the inner and outer air outlet seats and one ignition assembly are exposed on the support table 11 of the base assembly 1, ensuring the simplicity of the base body 101 and facilitating cleaning.

[0050] The ignition assembly 3 is provided with a support 31 abutting against the top of the support table 11, and the damper 2 is integrally formed with a pressing portion 27 extending towards the support 31 at the bottom, and in the embodiment, a slope or arc surface inclined upward or curved upward is formed at a position close to the support 31 at the bottom of the annular retaining ring 23, and specifically, the slope or arc surface inclined upward or curved upward is formed at one end of the bottom surface of the first arc segment 2301 close to the air outlet end of the outer ejector pipe 211, and part of the slope or arc surface constitutes the pressing portion 27, and the pressing portion 27 can tightly press the support 31 on the top surface of the support table 11, as shown in Figure 3 , so as to realize the tight pressing of the support 31 of the ignition assembly 3 on the top surface of the support table 11 by the slope or arc surface of the annular retaining ring 23, and improve the installation stability and reliability of the ignition assembly 3. In other embodiments, a clamping groove extending downward and opening downward can be integrally formed at a position corresponding to the support 31 at the bottom surface of the air cavity 221, and the clamping groove is configured to be clamped outside the support 31 and tightly press the support 31 on the top surface of the support table 11, and at this time, the pressing portion 27 is constituted by the clamping groove.

[0051] Referring to Figures 1-3 , the burner further comprises a fire cover assembly 4, the fire cover assembly 4 is arranged on the top of the damper 2 and covers the upward openings of the outer ring air cavity 222 and the inner ring air cavity 223 respectively.

[0052] The above only describes some embodiments of the present application. Those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A top air fired burner characterized by, The base assembly (1) comprises a support table (11) in a circular shape and an air outlet seat arranged outside the support table (11) and fixedly connected with the support table (11), the air outlet seat comprises an outer ring air outlet seat (121) and an inner ring air outlet seat (122) arranged in parallel and in the same direction; and The distributor (2) is installed on the top of the support table (11) and its orthographic projection covers the support table (11), the air outlet seat and the nozzle installed on the air outlet seat respectively, and the distributor (2) is provided with an outer ejector pipe (211) and an inner ejector pipe (212) arranged in parallel and in the same direction at the bottom of the distributor (2). The distributor (2) has an air cavity (221) opening upward, an annular retaining ring (23) extending downward is integrally formed at the bottom of the air cavity (221), the bottom surface of the annular retaining ring (23) abuts and fits with the top surface of the support table (11), and the distributor (2) is provided with a channel (24) in communication with the air cavity (221) and located radially outside the annular retaining ring (23); part or all of the inner ejector pipe (212) and the outer ejector pipe (211) are arranged in the annular retaining ring (23). The diameter of the support table (11) is greater than or equal to the outer diameter of the annular retaining ring (23) and less than the maximum outer diameter of the distributor (2).

2. A top air burner as claimed in claim 1, wherein A plurality of notches (231) are arranged in a circumferential direction at the lower end of the annular retaining ring (23); and / or the bottom surface of the air cavity (221) is in the shape of a circular truncated cone with a large lower end and a small upper end, and the channel (24) is arranged at the outer cavity wall surface or the lower end of the bottom surface of the air cavity (221).

3. A top air burner as claimed in claim 1, wherein An annular step (13) extending outward is integrally formed at the lower end of the circumferential wall of the support table (11), a plurality of mounting positions (131) are arranged in a circumferential direction on the annular step (13), and the orthographic projection of the distributor (2) covers the annular step (13) and all the mounting positions (131).

4. A top air burner as claimed in claim 1, wherein The outer ring air outlet seat (121) and the inner ring air outlet seat (122) are arranged in a staggered manner, and the distance between the two is greater than 35 mm; the distance between the outer ejector pipe (211) and the central axis of the distributor (2) is 25-35 mm, and the distance between the inner ejector pipe (212) and the central axis of the distributor (2) is 5-15 mm.

5. A top air burner as claimed in claim 1, wherein Two bosses (14) extending outward and arranged side by side are integrally formed at one end of the support table (11) close to the air outlet seat, and the two bosses (14) are integrally formed with the outer ring air outlet seat (121) and the inner ring air outlet seat (122) respectively.

6. A top air burner as claimed in claim 1 or 5, wherein ​ 7. A top air burner as claimed in claim 1 or 5, wherein The outer ring gas outlet seat (121) is a vertically arranged outer ring gas guide pipe with a vertically arranged outer ring gas channel (1211), the inner ring gas outlet seat (122) is a vertically arranged inner ring gas guide pipe (1221) with a vertically arranged inner ring gas channel, and / or a positioning structure is arranged between the distributor (2) and the outer ring gas outlet seat (121) and / or the inner ring gas outlet seat (122).

8. A top air burner as claimed in claim 7, wherein The lower ends of the outer ring gas guide pipe and the inner ring gas guide pipe (1221) both extend downward below the support table (11); a plurality of support legs (16) extending downward and a connecting arm (17) are integrally formed at the bottom of the support table (11), and opposite ends of the connecting arm (17) are integrally formed with the lower end of the outer ring gas guide pipe and the lower end of the inner ring gas guide pipe (1221), respectively.

9. A top air burner as claimed in claim 1, wherein, Further comprising an ignition assembly (3), an assembly hole (18) is arranged at one end of the support table (11) away from the gas outlet seat, the distributor (2) is provided with a mounting hole (26) corresponding to the position of the assembly hole (18), and the upper and lower ends of the ignition assembly (3) are vertically arranged in the mounting hole (26) and the assembly hole (18), respectively.

10. A top air burner as claimed in claim 9, wherein The ignition assembly (3) is provided with a support (31) abutting against the top of the support table (11), and a pressing portion (27) extending towards the support (31) is integrally formed at the bottom of the distributor (2), and the pressing portion (27) tightly presses the support (31) on the top surface of the support table (11).

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