An upper air inlet burner and a stove using the upper air inlet burner

Abstract

The present invention relates to an upper air-inlet burner, characterized in that it comprises a base, a first ejector pipe which penetrates the base transversely, a first fire cover which is arranged on the base and forms a first air mixing chamber located in the center between the base and the first ejector pipe, and a buffer cavity which is located under the base, wherein the air outlet end of the first ejector pipe is fluidly connected with the first air mixing chamber via the buffer cavity, and also relates to a stove using the burner. Compared with the prior art, the present invention has the advantage that the first ejector pipe penetrates the base transversely, which effectively increases the length of the first ejector pipe on the one hand, and in order to overcome the problem of uneven mixing of the secondary air / gas mixture caused by the smaller base than the first ejector pipe, the buffer cavity under the base is arranged so that the primary air / gas mixture ejected from the air outlet end of the first ejector pipe has a buffer space, thereby making the flame of the upper air-inlet burner short, uniform and powerful.

Description

Technical Field

[0001] The invention relates to a burner of a gas cooker, in particular to an upward air intake type cooker burner with multiple nozzles. Background Art

[0002] At present, many gas stoves have begun to use completely upper air intake burners. Since the primary and secondary air required by the completely upper air intake burners during combustion are all from the upper part of the stove panel, the chassis of the gas stove can be fully sealed. Compared with the traditional burners with lower air intake structure, the completely upper air intake burners are not only safer to use, but also can well solve the problem of stove flameout caused by opening and closing the cabinet door. However, the traditional completely upper air intake burners are all supplemented with primary air through the gap between the mixing chamber and the base. The problem caused by this is that there is a gap between the mixing chamber and the base. After the mounting screws of the panel are installed, the mounting screws can be seen from the outside of the burner, resulting in the appearance of the burner not being beautiful enough. In addition, after the gap is set between the base and the mixing chamber, the overflow will flow into the base and the circular basin-shaped body located below the panel, namely the term "bottom cup", through the gap, which is inconvenient for the user to maintain and clean. Moreover, if the overflow is not cleared for a long time, it will affect the normal use of the burner. In addition, the structure of the "bottom cup" often causes a sharp bend at the connection between the ejection pipe outlet and the mixed gas channel, which significantly increases the ejection resistance. This type of design, such as the Chinese utility model patent "Gas Burner" with patent number ZL201120156854.0 (authorization announcement number CN202082922U), has a poor ejection effect. At the same time, the primary air added from the panel of this type of upper air intake burner enters the "bottom cup" by utilizing the negative pressure generated by the nozzle spraying gas, which can easily cause uneven airflow distribution of the primary air, affecting the primary air flow to a certain extent. The gas coefficient makes the gas pressure flowing out of the fire holes arranged along the circumferential direction of the outer ring fire cover or the inner ring fire cover uneven, resulting in uneven flames of the outer circle fire generated by the outer ring fire cover or the inner circle fire generated by the inner ring fire cover. At the same time, the second ejector tube and the first ejector tube of this type of burner are both integrated with the "bottom cup" or separately arranged with the bottom cup. Regardless of the problem of poor ejection effect caused by the integrated arrangement with the "bottom cup" or the safety hazard caused by air leakage caused by the joints caused by the separate arrangement with the bottom cup, further improvements are needed to the existing upward air inlet burners. In addition, there is a type of Chinese invention patent application with application number 200810220263.8, which discloses "A multi-nozzle, large flow, fully upper air intake embedded household gas stove burner" (publication number CN101446415A). This invention arranges the inner and outer nozzles corresponding to the inner and outer ring ejectors on both sides of the diameter range of the burner, which can effectively improve the limitation of the short length of the ejector tube, and at the same time can realize independent adjustment of the inner and outer fires, with a large combustion power. The pursuit of high-power upper air intake burners has become a mainstream trend, but because the inner and outer ring ejectors are still arranged in the "bottom cup", the overall height of the burner is still high, and the overall aesthetics is poor. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide an upward air inlet burner capable of improving the uniform mixing of the primary air / gas mixture in the inner ring in view of the above-mentioned prior art status.

[0004] The second technical problem to be solved by the present invention is to provide an upper air inlet burner capable of improving the thermal efficiency of inner ring combustion in response to the above-mentioned existing technical status.

[0005] The third technical problem to be solved by the present invention is to provide an upward air inlet burner which can achieve high firepower and effectively reduce the overall height of the burner in response to the above-mentioned existing technical status.

[0006] The fourth technical problem to be solved by the present invention is to provide an upper air inlet burner with sufficient air supplement and complete combustion in response to the above-mentioned existing technical status.

[0007] The fifth technical problem to be solved by the present invention is to provide an upper air inlet burner which is convenient for users to clean in view of the above-mentioned existing technical status.

[0008] The sixth technical problem to be solved by the present invention is to provide a stove using the above-mentioned upper air inlet burner in view of the above-mentioned existing technical status.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: the upper air inlet burner is characterized by: comprising:

[0010] Base;

[0011] A first ejector tube, which passes through the base transversely;

[0012] A first fire cover is disposed on the base and forms a first gas mixing chamber located in the center between the first fire cover and the base;

[0013] The buffer cavity is located below the base, the gas outlet end of the first ejector pipe is fluidly connected with the first gas mixing chamber through the buffer cavity, and the gas inlet end of the first ejector pipe is adapted to be equipped with a first ejector.

[0014] In order to enable the user to individually control the central fire and peripheral fire formed by the burner, the system also includes a mounting seat and a second air mixing chamber arranged on the mounting seat, located outside the first air mixing chamber and independent of each other, the second air mixing chamber including an inner wall surface and an outer wall surface arranged at intervals, a bottom wall connecting the inner wall surface and the outer wall surface, and a second fire cover covering the inner wall surface and the outer wall surface.

[0015] In order to ensure that the length of the first ejector tube is effectively extended without causing the overall height of the upper air inlet burner to be too high, the bottom wall of the second air mixing chamber of the present invention has a special design, and the bottom wall includes a first tube wall corresponding to the air inlet end of the first ejector tube and a second tube wall corresponding to the air outlet end, respectively extending radially outward from the second fire cover. This design ingeniously extends the length of the first ejector tube and simplifies the bottom wall structure of the second air mixing chamber.

[0016] Based on the particularity of the bottom wall of the second mixing chamber, the non-traditional annular design of the inner wall of the second mixing chamber is also adaptively designed accordingly, and the distance D1 between the inner wall and the base is greater than the distance between the inner wall and the first tube wall D2 and the distance between the inner wall and the second tube wall D3.

[0017] Furthermore, the cavity formed by the inner wall surface, the base and the first ejector tube constitutes a secondary air passage connecting the outside world with the second fire cover fire outlet area. Due to the particularity of the inner wall surface of the second air mixing chamber, the air intake area of ​​the secondary air passage can be effectively increased.

[0018] Furthermore, the first injector is arranged on a nozzle seat located below the second air mixing chamber, the first injector is arranged at a central position of the nozzle seat and extends out from a mounting seat located above the nozzle seat, and also includes a second injector which is also arranged on the nozzle seat and spaced apart from the first injector, and a second injector tube which is independently arranged in the second air mixing chamber from the first injector tube, the air inlet of the second injector tube is opposite to the second injector, and the air outlet is communicated with the second air mixing chamber. The nozzle seat eliminates the conventional bottom cup under the panel, and instead directly mounts the first injector and the second injector through the nozzle seat, so that the first injector and the second injector can directly replenish air through the air channel above the mounting seat, which is convenient for replenishment and can ensure that the air replenishment amount is sufficient to promote full combustion of the burner; in addition, while eliminating the conventional bottom cup under the mounting seat, the second ejector pipe is cleverly placed in the second air mixing chamber, which can reduce the overall height of the burner on the one hand, and avoid the safety hazard caused by air leakage when the second ejector pipe is connected by a seam on the other hand; the present invention adopts a method of multiple nozzles and multiple ejector pipes, which overcomes the limitation that the ejector pipe is limited to the diameter range of the burner, resulting in the ejector pipe size being still short, thereby ensuring the burner's one-time air ejection capability and achieving high firepower.

[0019] In order to make the overall structure of the upper air inlet burner compact and improve the mixing of the primary air / gas mixture in the inner ring to be more uniform, the buffer chamber is located below the first ejector tube, but there is no need to find an independent structure design buffer chamber between the nozzle seat and the first ejector tube: the central position of the nozzle seat has a central cavity connected to the base and a peripheral cavity extending toward the outlet end of the first ejector tube, and the central cavity and the peripheral cavity together constitute the buffer chamber. In this way, the nozzle seat plays a dual role, replacing the "bottom cup" and partially serving as a buffer chamber.

[0020] Furthermore, a through hole for communicating between the central cavity and the base is opened at the central position of the mounting seat.

[0021] In order to prevent the overall height of the burner from being too high and to supplement primary air on the mounting seat with a sufficient amount of primary air, a primary air channel is also included. The primary air channel is formed on the outer wall surface corresponding to the nozzle seat at a position that is partially recessed inwardly along the radial direction of the mixing chamber; the inwardly recessed outer wall surface portion directly serves as a partition separating the primary air channel and the secondary air channel, and the partition portion is provided with an air inlet of the second ejector tube and an air inlet end of the first ejector tube.

[0022] Furthermore, the bottom wall of the second air mixing chamber is at least concave at other parts of the periphery of the primary air channel to form a support foot, and the gap formed between adjacent support feet is connected to the secondary air channel, and the secondary air channel is independent of the primary air channel. The primary air channel and the secondary air channel on the lower surface of the second air mixing chamber are independent of each other, and a part of the outer ring wall is cleverly used as a partition that separates each other and does not affect each other, without the need to add other partition components. The structure is simple and can ensure that the overall height of the burner is not too high, and the structure is compact.

[0023] In order to effectively reduce the overall height of the burner, the present invention cleverly arranges the second ejector tube in the second gas mixing chamber; a recess for accommodating the second ejector tube is formed in the support leg.

[0024] In order to facilitate the placement of the second fire cover, the second fire cover includes an annular body, and the inner edge and outer edge of the annular top wall of the body respectively extend downward to form an inner wall connected to the inner wall surface and an outer wall connected to the outer wall surface, and a main fire hole is opened on the outer wall.

[0025] In order to prevent the flame from leaving the main fire hole, the air inlet end of the main fire hole is located at the bottom end of the outer wall, and the air outlet end of the main fire hole is located at the outer wall. A first flame stabilizing hole is opened on the outer wall above the air outlet end of the main fire hole, and the first flame stabilizing hole and the main fire hole are staggered along the circumferential direction.

[0026] In order to prevent the overflow from entering the nozzle seat, the outer wall extends outward to form a protective umbrella that shields the top of the nozzle seat. This design brings the following benefits: 1. The outer wall can form a waterproof eaves above the nozzle seat to prevent the overflow from entering the first injector and the second injector on the nozzle seat; 2. The outer wall can be made of heat-insulating material to prevent the flame heat generated by the second fire hole and the second flame-stabilizing hole from interfering with the replenishment of the primary air of the first injector and the second injector on the nozzle seat; 3. The outer wall can serve as a "partition plate" to separate the secondary air used to replenish the secondary air channel connected to the second air mixing chamber and the primary air replenished to the first injector and the second injector on the nozzle seat.

[0027] In order to allow the overflow liquid to quickly flow out of the nozzle seat, the outer wall gradually extends downward from top to bottom in a radial direction outward of the second gas mixing chamber.

[0028] In order to facilitate the placement of the first fire cover and stabilize the flame of the inner fire hole, the first fire cover includes a top cover and an outer annular wall extending downward from the top cover, and the outer annular wall is provided with an inner fire hole connected to the first mixing chamber and a second flame stabilizing hole located above and / or below the inner fire hole.

[0029] In order to solve the last technical problem, the present invention provides a stove using the above-mentioned upper air inlet burner, comprising a panel, characterized in that the mounting seat is a part of the panel.

[0030] The stove using the above-mentioned upper air inlet burner may also include a liquid receiving pan located below the burner, wherein the feature is that the liquid receiving pan serves as the mounting seat.

[0031] Compared with the prior art, the advantage of the present invention is that the first ejector tube runs through the base horizontally, which effectively increases the length of the first ejector tube on the one hand. In order to overcome the problem of uneven mixing of the secondary air / gas mixture caused by the smaller base relative to the first ejector tube, the buffer chamber under the base is arranged so that the primary air / gas mixture ejected from the outlet end of the first ejector tube has a buffer space. The primary air evenly mixed by the buffer chamber is mixed with the gas and the primary air to enter the base, avoiding the gas and the primary air from colliding with each other from different directions. The uniformity of the mixing of the primary air and the gas is further improved, while the primary air intake rate is increased, and the kinetic energy loss can be effectively reduced to make it diffuse evenly, so that the ignition area supplied by the first mixing chamber to the first fire cover can maintain a stable and uniform flame, so that the flame of the upper air inlet burner is short, uniform and powerful, and there will be no defects such as yellow flame and flashback. Finally, the first mixing chamber and the first fire cover of the present invention are both easy-to-disassemble and install structures, which are convenient for users to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an upper air inlet burner placed on a panel in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A cross-sectional view of

[0034] Figure 3 It is a structural schematic diagram of an upper air inlet burner at an angle in an embodiment of the present invention (without the panel);

[0035] Figure 4 This is a structural schematic diagram of the upper air inlet burner from another angle in an embodiment of the present invention (without the panel);

[0036] Figure 5 for Figure 3 A cross-sectional view at an angle;

[0037] Figure 6 Schematic diagram of the structure of the bottom of the second gas mixing chamber in an embodiment of the present invention;

[0038] Figure 7 Schematic diagram of the structure of the second gas mixing chamber in an embodiment of the present invention;

[0039] Figure 8 A schematic structural diagram of a nozzle holder in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings.

[0041] like Figures 1 to 8The figure is the best embodiment of this embodiment. The upper air inlet burner of this embodiment includes a base 11, a first ejector pipe 2 which runs through the base 11 transversely, is arranged on the base 11, and a first gas mixing chamber 1 located in the center and a buffer chamber 4 located under the base are formed between the base 11 and the first ejector pipe 2. The gas outlet end 23 of the first ejector pipe 2 is in fluid communication with the first gas mixing chamber 1 through the buffer chamber 4, and the gas inlet end 24 of the first ejector pipe 2 is adapted with a first injector 5. Since the first ejector pipe 2 runs through the base 11 transversely, on the one hand, the length of the first ejector pipe 2 is effectively increased. In order to overcome the problem of uneven mixing of the secondary air / gas mixture caused by the smaller base 11 than the first ejector pipe 2, the buffer chamber 4 under the base 11 can make the primary air / gas mixture ejected from the gas outlet end 23 of the first ejector pipe 2 have a buffer space, and the primary air uniformed by the buffer chamber 4 is mixed with the gas and the primary air and enters the base 11, so as to avoid the gas and the primary air from merging from different directions and colliding with each other, and further improve the uniformity of the mixing of the primary air and the gas. In order to allow the user to individually control the central fire and peripheral fire formed by the burner, the present embodiment also includes a mounting seat 20 and a second air mixing chamber 6 disposed on the mounting seat 20 and located outside the first air mixing chamber 4 and independent of each other. The second air mixing chamber includes an inner wall surface 61 and an outer wall surface 62 disposed at intervals and a bottom wall 63 connecting the inner wall surface 61 and the outer wall surface 62. The inner wall surface 61 and the outer wall surface 62 are covered with a second fire cover 7. The inner wall surface 61, the outer wall surface 62, the bottom wall 63 and the second fire cover 7 are jointly formed to form the second air mixing chamber 6. In order to ensure that the length of the first ejector tube 2 is effectively extended without causing the overall height of the upper air inlet burner to be too high, the bottom wall 63 of the second air mixing chamber 6 of the present invention has a special design. The bottom wall 63 includes a first tube wall 240 corresponding to the air inlet end 24 of the first ejector tube 2 and a second tube wall 230 corresponding to the air outlet end 23, which are respectively extended radially outward along the second fire cover 7.

[0042] This design cleverly extends the length of the first ejector tube 2 and simplifies the structure of the bottom wall 63 of the second air mixing chamber 6. Based on the particularity of the bottom wall 63 of the second air mixing chamber 6, the non-traditional annular design of the inner wall surface 61 of the second air mixing chamber 6 is also adaptively designed accordingly. The distance D1 between the inner wall surface 61 and the base 11 is greater than the distance D2 between the inner wall surface 61 and the first tube wall 240 and the distance D3 between the inner wall surface 61 and the second tube wall 230. In addition, the cavity enclosed by the inner wall surface 61, the base 11 and the first ejector tube 2 constitutes a secondary air passage 10 connecting the outside world and the fire outlet area of ​​the second fire cover 7. Due to the particularity of the inner wall surface 61 of the second air mixing chamber 6, the air intake area of ​​the secondary air passage 10 can be effectively increased.

[0043] In addition, it also includes a nozzle seat 8 arranged below the second air mixing chamber 6, a first injector 5 is arranged at the central position of the nozzle seat 8 and extends above the mounting seat 20 above the nozzle seat 8, a second injector is also arranged on the nozzle seat 8 and spaced apart from the first injector 5, and a second injector pipe independently of the first injector pipe 2 and arranged in the second air mixing chamber 6, the air inlet 41 of the second injector pipe is opposite to the second injector, and the air outlet 42 is connected to the second air mixing chamber 6. The nozzle seat 8 eliminates the conventional bottom cup located under the mounting seat 20. Instead, the first injector 5 and the second injector are directly installed through the nozzle seat 8, so that the first injector 5 and the second injector can directly replenish air through the air channel above the mounting seat 20. While replenishment is convenient, it can also ensure that the air replenishment amount is sufficient to promote full combustion of the burner. In addition, while eliminating the conventional bottom cup located under the mounting seat 20, the second injector pipe is cleverly placed in the second mixing chamber 6. On the one hand, it can reduce the overall height of the burner, and on the other hand, it can avoid the safety hazard caused by leakage when the second injector pipe is connected by a seam. In order to make the overall structure of the upper air inlet burner compact and improve the mixing of the primary air / gas mixture in the inner ring to be more uniform, the buffer chamber 4 is located below the first ejector tube 2, but there is no need to find an independent structure between the nozzle seat 8 and the first ejector tube 2 to design the buffer chamber 4: the central position of the nozzle seat 8 has a central cavity 81 connected to the base 11 and a peripheral cavity 82 extending toward the air outlet end 23 of the first ejector tube 2. The central cavity 81 and the peripheral cavity 82 together constitute the buffer chamber, so that the nozzle seat 8 serves a dual purpose, replacing the "bottom cup" and partially serving as the buffer chamber 4. The present invention adopts a method of multiple injectors and multiple ejector tubes, which overcomes the limitation that the ejector tube is limited to the diameter range of the burner, resulting in the ejector tube size being still short, ensuring the burner's primary air ejection capability and achieving high firepower.

[0044] In this embodiment, two second injectors are provided, namely the first second injector 30 and the second second injector 30', and are symmetrically arranged on both sides of the first injector 5. Two second ejector pipes are also provided correspondingly, namely the first second ejector pipe 40 and the second second ejector pipe 40'. In order to prevent the overall height of the burner from being too high and to supplement primary air on the mounting seat 20 in sufficient amount, a primary air channel 50 is also included. The primary air channel 50 is formed on the outer wall surface 62 at a location corresponding to the nozzle seat 8 and partially inwardly recessed along the radial direction of the mixing chamber; the inwardly recessed outer wall surface 62 portion directly serves as a partition 620 for separating the primary air channel 50 and the secondary air channel 10, and no other partition components need to be added. The structure is simple and can ensure that the overall height of the burner is not too high, and the structure is compact. The partition 620 is provided with an air inlet 41 of the second ejector pipe and an air inlet end 24 of the first ejector pipe 2. In addition, the bottom wall 63 of the second mixing chamber 6 and other parts of the periphery of the primary air channel 50 have at least one recessed place to form a support foot 60. In order to avoid mutual interference between the primary air channel 50 and the secondary air channel 10, the present embodiment is preferably a place on the opposite side of the nozzle seat 8. For this reason, the gap formed between adjacent support feet 60 connects the secondary air channel 10 and the outside. At the same time, in order to prevent mutual interference when replenishing the primary air and the secondary air, the secondary air channel 10 and the primary air channel 50 are independently arranged. At the same time, since the support foot 60 formed at the recessed part is hollow, not only a first recess 601 for accommodating the first second ejector tube 40 and a second recess 602 for accommodating the second second ejector tube 40′ are formed, but also the overall height of the burner can be effectively reduced.

[0045] Finally, the second fire cover 7 of the present invention also has its own particularity, including an annular main body, the inner edge and outer edge of the annular top wall 71 of the main body respectively extending downward to form an inner wall 72 connected to the inner wall surface 61 and an outer wall 73 connected to the outer wall surface 62, and the outer wall is provided with a first flame stabilizing hole 732 above the gas outlet end 7311 of the main fire hole 731, and the first flame stabilizing hole 732 and the main fire hole 731 are staggered along the circumferential direction. In order to prevent overflow from entering the nozzle seat 8, the outer wall 73 extends outward to form a protective umbrella covering the top of the nozzle seat 8. This design brings the following benefits: 1. The outer wall 73 can form a waterproof eaves above the nozzle seat 8 to prevent overflow from entering the first injector 5 and the second injector on the nozzle seat 8; 2. The outer wall 73 can be made of heat-insulating material to prevent the flame heat generated by the flames of the inner fire hole 321 and the second flame-stabilizing hole 322 from interfering with the replenishment of primary air to the first injector 5 and the second injector on the nozzle seat 8; 3. The outer wall 73 can serve as a "partition plate" to separate the secondary air used to replenish the inner fire hole 321 and the second flame-stabilizing hole 322 connected to the second air mixing chamber 6 and the primary air replenished to the first injector 5 and the second injector on the nozzle seat 8. In order to allow the overflow to flow quickly to the outside of the nozzle seat 8, the outer wall 73 extends radially outward from the second air mixing chamber 6 and gradually downward from top to bottom. In order to facilitate the placement of the first fire cover 3 and stabilize the flame of the inner fire hole 321, the first fire cover 3 includes a top cover 31 and an outer annular wall 32 extending downward from the top cover 31, and the outer annular wall 32 is provided with an inner fire hole 321 connected to the first mixing chamber 1 and a second flame stabilizing hole 322 located above the inner fire hole 321.

[0046] The present invention also provides a stove using the above-mentioned upper air inlet burner, in which the liquid collecting pan 200 is directly used as the mounting base 20. In order to reduce the heat conduction in contact with the panel 201 or the liquid collecting pan 200 and improve the thermal efficiency, the second mixing chamber 6 uses a support connection method of a support column 600. A through hole 202 is provided at the central position of the liquid collecting pan 200 for connecting the central cavity 81 and the base 11. As described above, the paths of the primary air, the gas and the mixed primary air and gas inside the burner are as follows: the primary air is sucked from the outside into the first injector 5 of the nozzle seat 8 due to and by the kinetic energy of the gas itself, and the primary air and gas are premixed and enter the first mixing chamber 1 respectively. The mixed primary air and gas finally pass through the inner fire hole 321 of the first fire cover 3, the second flame stabilizing hole 322 located above the inner fire hole 321, and the third flame stabilizing hole 324 located below the inner fire hole 321, and are ignited together with the secondary air of the external environment to form an inner ring fire. It also includes a second fire cover 7 that enables the user to control the peripheral fire individually. The primary air and fuel gas required for the peripheral fire are input into the second mixing chamber 6 by the second injector pipe independently of the first injector pipe 2. At the same time, the second mixing chamber 6 is separated from the first mixing chamber 1, so that the fluid separation of the second mixing chamber 6 and the first mixing chamber 1 is achieved, and then they can be supplied separately to allow the user to individually control the inflow of the fuel mixture into the first injector pipe 2 and the second injector pipe. If the size of the peripheral fire and the central fire is to be adjusted, the regulating valve of the first intake pipe 100 connected to the first injector 5 and the second intake pipe 200 and the third intake pipe 300 connected to the first second injector 30 and the second second injector 30' can be adjusted. In addition, since the first second injector 30 and the second second injector 30' and the second intake pipe 200 and the third intake pipe 300 are symmetrically designed relative to the first injector 5, it is beneficial to balance the injection pressure of each injector.

Claims

1. An upward air inlet burner, characterized in that: Included Base (11); A first ejector tube (2) transversely passes through the base (11); A first fire cover (3) is arranged on the base (11), and a first gas mixing chamber (1) located in the center is formed between the first fire cover and the base (11); a buffer chamber (4) located below the base (11); an air outlet end (23) of the first ejector tube (2) is in fluid communication with the first gas mixing chamber (1) via the buffer chamber (4); and an air inlet end (24) of the first ejector tube (2) is adapted to be equipped with a first ejector (5); It also includes a mounting seat (20) and a second air mixing chamber (6) which is arranged on the mounting seat (20) and is located outside the first air mixing chamber (1) and is independent of each other, wherein the second air mixing chamber (6) includes an inner wall surface (61) and an outer wall surface (62) which are arranged at intervals, a bottom wall (63) connecting the inner wall surface (61) and the outer wall surface (62), and a second fire cover (7) covering the inner wall surface (61) and the outer wall surface (62); The first ejector (5) is arranged on a nozzle seat (8) below the second gas mixing chamber (6); the first ejector (5) is arranged at a central position of the nozzle seat (8) and extends above a mounting seat (20) above the nozzle seat (8); and further comprises a second ejector (30, 30') also arranged on the nozzle seat (8) and spaced apart from the first ejector (5); and a second ejector pipe (40, 40') independently of the first ejector pipe (2) and arranged in the second gas mixing chamber (6); an air inlet (41) of the second ejector pipe (40, 40') is opposite to the second ejector (30, 30'), and an air outlet (42) is communicated with the second gas mixing chamber (6); The central position of the nozzle seat (8) comprises a central cavity (81) connected to the base (11) and a peripheral cavity (82) extending towards the gas outlet end (23) of the first ejector tube (2), wherein the central cavity (81) and the peripheral cavity (82) together constitute the buffer cavity (4).

2. The upward air inlet burner according to claim 1, characterized in that: The bottom wall (63) includes a first tube wall (240) corresponding to the air inlet end (24) of the first ejector tube (2) and a second tube wall (230) corresponding to the air outlet end (23), respectively extending radially outward along the second fire cover (7).

3. The upward air inlet burner according to claim 2, characterized in that: A distance D1 between the inner wall surface (61) and the base (11) is greater than a distance D2 between the inner wall surface (61) and the first tube wall (240) and a distance D3 between the inner wall surface (61) and the second tube wall (230).

4. The upward air inlet burner according to claim 3 is characterized in that: The cavity enclosed by the inner wall surface (61), the base (11) and the first ejector tube (2) forms a secondary air passage (10) connecting the outside world and the fire outlet area of ​​the second fire cover (7).

5. The upward air inlet burner according to claim 4, characterized in that: A through hole (202) for communicating between the central cavity (81) and the base (11) is provided at the central position of the mounting seat (20).

6. The upward air inlet burner according to claim 4 or 5, characterized in that: It also includes a primary air channel (50), the primary air channel (50) being formed at a portion of the outer wall surface (62) corresponding to the nozzle seat (8) and partially recessed inwardly along the radial direction of the second air mixing chamber (6); the inwardly recessed portion of the outer wall surface (62) directly serves as a partition (620) for separating the primary air channel (50) and the secondary air channel (10), and the partition (620) is provided with an air inlet (41) of the second ejector tube and an air inlet end (24) of the first ejector tube (2).

7. The upward air inlet burner according to claim 6, characterized in that: The bottom wall (63) of the second air mixing chamber (6) has at least one recessed portion at the other portion of the periphery of the primary air passage (50) to form a support foot (60), and the gaps formed between adjacent support feet (60) are connected to the secondary air passage (10), and the secondary air passage (10) and the primary air passage (50) are independent of each other.

8. The upward air inlet burner according to claim 7, characterized in that: A recess (601, 602) for accommodating the second ejector tube is formed in the support foot (60).

9. The upward air inlet burner according to any one of claims 1 to 5, characterized in that: The second fire cover (7) includes an annular body, the inner edge and the outer edge of the annular top wall (71) of the body respectively extend downward to form an inner wall (72) connected to the inner wall surface (61) and an outer wall (73) connected to the outer wall surface (62), and the outer wall (73) is provided with a main fire hole (731).

10. The upward air inlet burner according to claim 9, characterized in that: The air inlet end (7312) of the main fire hole (731) is located at the bottom end of the outer wall (73), and the air outlet end (7311) of the main fire hole (731) is located at the outer wall (73). The outer wall (73) is provided with a first flame stabilizing hole (732) above the air outlet end (7311) of the main fire hole (731), and the first flame stabilizing hole (732) and the main fire hole (731) are staggered and arranged at intervals along the circumferential direction.

11. The upward air inlet burner according to claim 10, characterized in that: The outer wall (73) extends outwards to form a protective umbrella that shields the top of the nozzle seat (8).

12. The upward air inlet burner according to claim 10, characterized in that: The outer wall (73) gradually extends downward from top to bottom in a radially outward direction of the second gas mixing chamber (6).

13. The upward air inlet burner according to any one of claims 1 to 5, characterized in that: The first fire cover (3) comprises a top cover (31) and an outer annular wall (32) extending downward from the top cover (31), the outer annular wall (32) being provided with an inner fire hole (321) connected to the first gas mixing chamber (1) and a second flame stabilizing hole (322) located above and / or below the inner fire hole (321).

14. A stove using the upper air inlet burner according to any one of claims 1 to 13, comprising a panel (201), characterized in that: The mounting seat (20) is a part of the panel (201).

15. A stove using the upper air inlet burner according to any one of claims 1 to 13, comprising a liquid receiving tray (200) located below the burner, characterized in that: The liquid receiving tray (200) serves as the mounting seat (20).

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