CN111121038A - Upper air inlet burner and cooker applying same - Google Patents

Abstract

The invention relates to an upper air inlet burner, which is characterized in that: the inner side edge and the outer side edge of the top wall of the second fire cover respectively extend downwards to form an inner wall and an outer wall, the outer wall is provided with a main fire hole, and the inner wall is surrounded with an air supplementing cavity; compared with the prior art, the invention has the advantages that the invention provides the upper air inlet burner which can adapt to the first injection pipe with multiple nozzles, and the rhombic air supply cavity formed by the first inner wall and the second inner wall in the inner wall of the second fire cover is larger than the pipe wall of the first injection pipe, so that the problem of high air inlet power is effectively solved, and simultaneously sufficient air is supplied to promote the sufficient combustion of the upper air inlet burner.

Description

Upper air inlet burner and cooker applying same

Technical Field

The invention relates to a burner of a gas cooker, in particular to an upper air inlet type cooker burner with multiple nozzles.

Background

At present, a complete upper air inlet type burner is used in a plurality of gas cookers, and because primary air and secondary air required by the complete upper air inlet type burner during burning are both from the upper part of a cooker panel, a chassis of the gas cooker can be completely sealed. However, the conventional burner with complete upward air intake is realized by the gap between the air mixing chamber and the base when primary air is supplemented, and therefore, the problem is that the gap exists between the air mixing chamber and the base, and after the mounting screw of the panel is mounted, the mounting screw can be seen from the outside of the burner, so that the appearance of the burner is not beautiful enough. Moreover, after the gap is formed between the base and the air mixing chamber, the overflowing liquid can flow into the base and the round basin-shaped main body positioned below the panel, namely the bottom cup, through the gap, so that much inconvenience is brought to maintenance and cleaning of a user, and the normal use of the burner can be influenced if the overflowing liquid cannot be removed for a long time. In addition, the structure of the 'bottom cup' causes the connecting part of the outlet of the injection pipe and the mixed gas channel to have sharp bend, which obviously increases injection resistance, and the design is like Chinese utility model patent ZL201120156854.0 (No. CN202082922U), the injection effect is not good, meanwhile, the primary air supplemented from the panel of the upper air inlet burner enters the 'bottom cup' by utilizing the negative pressure generated by the gas injected by the nozzle, which easily causes the uneven distribution of the air flow of the primary air and influences the primary air coefficient to a certain extent, thereby causing the uneven gas pressure flowing out from the fire holes arranged along the circumferential direction of the outer ring fire cover or the inner ring fire cover, thereby causing the uneven flame of the outer ring fire generated by the outer ring fire cover or the inner ring fire generated by the inner ring fire cover, and simultaneously, the second injection pipe and the first injection pipe of the burner are both arranged with the 'bottom cup', or with the setting of end cup components of a whole that can function independently, no matter the problem that the effect of drawing is poor is drawn in the influence that sets up with "end cup" an organic whole, still with the potential safety hazard that the seam produced that sets up the body that sets up with end cup components of a whole that can function independently brought, all need make further improvement to current last air inlet combustor. In addition, the invention discloses a multi-nozzle, large-flow and completely upward air inlet embedded type burner for a household gas stove (with the publication number of CN101446415A) as Chinese invention patent application with the application number of 200810220263.8, wherein the invention respectively arranges the inner nozzle and the outer nozzle corresponding to the inner ring ejector and the outer ring ejector at two sides in the diameter range of the burner, which can effectively improve the limitation of short length of the ejector pipe, simultaneously can realize independent adjustment of the inner flame and the outer flame, has higher combustion power, and becomes the mainstream trend of the upper air inlet burner pursuing high power, but because the inner ring ejector and the outer ring ejector are still arranged in a bottom cup, the integral height of the burner is still higher, and the integral aesthetic property is poorer.

In addition, an important measure of the high-power upper air inlet burner is a mode of increasing multiple nozzles, but in the multiple nozzle mode, for example, in order to adapt to multiple nozzles by an ejector pipe, the applicant develops an ejector pipe such as an ejector pipe (with an authorization publication number of CN103234201B) in Chinese invention patent number ZL201310122553.X, the number of nozzles adapted to the ejector pipe is multiple, and compared with a single-nozzle ejector pipe, the ejector capacity of the ejector pipe can be enhanced.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an upper intake air burner with sufficient air supply and sufficient combustion in view of the above-mentioned prior art.

The second technical problem to be solved by the present invention is to provide an upper air inlet burner which is applied with the fire cover and can effectively enhance the injection capability of the inner ring injection pipe, aiming at the current state of the prior art.

The third technical problem to be solved by the present invention is to provide an upper intake burner which can achieve high thermal power and effectively reduce the entire height of the burner, in view of the above-mentioned current state of the art.

A fourth technical problem to be solved by the present invention is to provide an upper inlet air burner which is convenient for users to clean in view of the above prior art.

The fifth technical problem to be solved by the present invention is to provide a cooking stove using the above upper intake burner, aiming at the above prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: this go up air inlet combustor, its characterized in that: comprises that

The inner side edge and the outer side edge of the top wall of the second fire cover respectively extend downwards to form an inner wall and an outer wall, the outer wall is provided with a main fire hole, and the inner wall is surrounded with an air replenishing cavity which is communicated with the outside air and has narrow two ends and wide center;

the first ejector pipe is provided with a horizontal pipe and a vertical pipe which are mutually communicated, the horizontal pipe is positioned below the second fire cover and is arranged along the length direction of the air supplementing cavity, the vertical pipe is positioned in the center of the air supplementing cavity, extends upwards and is provided with a gap with the inner wall, the inlet of the horizontal pipe is the air inlet end of the first ejector pipe, and the air inlet end is matched with at least one first ejector;

and the first fire cover covers the vertical pipe to form a first gas mixing chamber in the center.

In order to increase the injection capacity of the first injection pipe, the first injection pipe is in a flat straight pipe shape, and two first ejectors arranged side by side are matched at the air inlet end of the first injection pipe.

In order to increase the turbulence of the fuel gas and the primary air, a turbulence body used for increasing the turbulence of the fuel gas and the primary air is arranged at the gas inlet end of the first injection pipe and comprises a convex column protruding downwards on the surface of the inner wall of the pipe wall of the first injection pipe.

Preferably, at least two groups of the convex columns are arranged at intervals along the axis of the first injection pipe, and the corresponding convex columns between the adjacent groups are staggered.

In order to effectively increase the amount of secondary air at the periphery of the pipe wall of the first injection pipe, the first injection pipe comprises a first pipe wall corresponding to the air inlet end and a second pipe wall corresponding to the air outlet end, and the distance D1 between the first inner wall and/or the second inner wall and the first air mixing chamber is larger than the distance D2 between the first inner wall and/or the second inner wall and the first pipe wall and the distance D3 between the first inner wall and/or the second inner wall and the second pipe wall.

In order to enable a user to independently control the central fire and the peripheral fire formed by the burner, the burner also comprises a nozzle seat positioned below the first ejector pipe, the first ejector is arranged in the central position of the nozzle seat and extends out of the mounting seat positioned above the nozzle seat, the burner also comprises a second air mixing chamber which is arranged on the mounting seat and positioned at the periphery of the first air mixing chamber, and the second air mixing chamber comprises an inner wall surface jointed with the inner wall, an outer wall surface jointed with the outer wall, a bottom wall connecting the inner wall surface and the outer wall surface, and a second fire cover covering the upper parts of the inner wall surface and the outer wall surface. The conventional bottom cup positioned below the panel is cancelled by utilizing the nozzle seat, and the first ejector is directly installed through the nozzle seat, so that the first ejector can directly supplement air through an air channel above the installation seat, and the air supplement quantity is sufficient while the supplement is convenient, so that the combustion of the combustor is fully promoted.

The gas mixing device also comprises a second ejector which is also arranged on the nozzle seat and is arranged at an interval with the first ejector, and a second injection pipe which is independent of the first injection pipe and is arranged in the second gas mixing chamber, wherein the gas inlet of the second injection pipe is opposite to the second ejector, and the gas outlet is communicated with the second gas mixing chamber. The second ejector also directly supplements air through an air channel above the mounting seat, so that the supplementation is convenient, and the sufficient air supplementation amount can be ensured to promote the sufficient combustion of the combustor; in addition, the conventional bottom cup positioned below the mounting seat is eliminated, and meanwhile, the second injection pipe is skillfully arranged in the second gas mixing chamber, so that the overall height of the combustor can be reduced, and the potential safety hazard caused by gas leakage when the second injection pipe is connected by a seam can be avoided; the invention adopts a mode of a plurality of nozzles and a plurality of injection pipes, overcomes the limitation that the injection pipes are limited in the diameter range of the combustor to cause the size of the injection pipes to be still short, ensures the primary air injection capacity of the combustor and realizes large firepower.

In order to prevent the overall height of the burner from being too high, supplement primary air on the mounting seat and ensure that the amount of the primary air is sufficient, the burner also comprises a primary air channel, wherein the primary air channel is formed at a position, corresponding to the nozzle seat, on the outer wall surface and is locally recessed inwards along the radial direction of the second air mixing chamber; the inward-concave outer wall surface part is directly used as a separating part for separating the primary air channel and the secondary air channel, and the separating part is provided with an air inlet of the second injection pipe and an air inlet of the first injection pipe.

Furthermore, at least one part of the bottom wall of the second air mixing chamber is recessed to form a support leg at other parts of the periphery of the primary air channel, the interval formed between adjacent support legs is communicated with the secondary air channel, and the secondary air channel is independent from the primary air channel. The primary air channel and the secondary air channel on the lower surface of the second air mixing chamber are mutually independent, the local part of the outer ring wall surface is skillfully used as a separating part for separating each other without mutual influence, other separating parts are not required to be additionally arranged, the structure is simple, the integral height of the combustor can be ensured not to be too high, and the structure is compact.

In order to effectively reduce the whole height of the combustor, the second injection pipe is skillfully arranged in the second gas mixing chamber; and a notch for accommodating the second injection pipe is formed in the supporting leg.

In order to conveniently place the first fire cover and stabilize the flame of the first fire cover, the first fire cover comprises a top cover and an outer ring wall extending downwards from the top cover, and the outer ring wall is provided with an inner fire hole communicated with the first gas mixing chamber and second flame stabilizing holes positioned above and/or below the inner fire hole.

In order to prevent the overflow from entering the nozzle holder, the outer wall extends outwards to form a protective umbrella covering the nozzle holder. This design brings the following benefits: the outer wall can form a waterproof brim above the nozzle seat to prevent overflow liquid from entering a first ejector and a second ejector on the nozzle seat; the outer wall can be made of heat insulating materials so as to prevent flame heat generated by flame coming out from the second fire holes and the second flame stabilizing holes from interfering with primary air supplement of the first ejector and the second ejector on the nozzle seat; and thirdly, the outer wall can be used as a 'separation plate' to separate secondary air for supplementing a secondary air channel communicated with the second air mixing chamber and primary air for supplementing the first ejector and the second ejector on the nozzle seat.

In order to allow the overflowing liquid to flow out of the nozzle holder quickly, the outer wall gradually extends downward from top to bottom radially outward of the second air-mixing chamber.

The invention provides a cooker with the above upper air inlet burner to solve the last technical problem, which comprises a panel and is characterized in that: the mounting seat is a part of the panel.

The cooker applying the upper air inlet burner can also comprise a liquid containing disc positioned below the burner, and is characterized in that: the liquid containing disc is used as the mounting seat.

Compared with the prior art, the invention has the advantages that the upper air inlet burner which can adapt to the first injection pipe with multiple nozzles is provided, the pipe wall of the first injection pipe is enlarged, the number of the first ejectors is increased, and meanwhile, the pipe wall enlargement of the first injection pipe can reduce the amount of secondary air at the periphery of the pipe wall of the first injection pipe and block the traditional secondary air channel at the side wall of the air mixing chamber.

Drawings

FIG. 1 is a schematic view of an embodiment of the present invention with an upper inlet burner resting on a panel;

FIG. 2 is a schematic view of the configuration of an upper inlet air burner at an angle (panel omitted) in an embodiment of the invention;

FIG. 3 is a schematic view of the configuration of an upper inlet air burner at another angle in an embodiment of the present invention (panel omitted);

FIG. 4 is an angled cross-sectional view of FIG. 2;

FIG. 5 is a cross-sectional view at another angle of FIG. 2;

FIG. 6 is a schematic structural view of a second fire cover in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of the bottom of the second air mixing chamber in the embodiment of the present invention;

FIG. 8 is a schematic structural view of the interior of the second air mixing chamber in the embodiment of the present invention;

FIG. 9 is a schematic view showing the structure of a nozzle holder in the embodiment of the present invention;

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in FIGS. 1 to 9, the preferred embodiment of the present invention is shown. The upper air inlet burner of the embodiment comprises a first fire cover 3, a first injection pipe 2 with a horizontal pipe 21 and a vertical pipe 22 which are communicated with each other, wherein an inlet of the horizontal pipe 21 is an air inlet end 24, the vertical pipe is positioned at the central position of the whole burner, the top end of the vertical pipe is an air outlet end 23, the first fire cover 3 covers the air outlet end 23 to form a first air mixing chamber 1 and is arranged in the air inlet end 24 of the first injection pipe 2, the first injection pipe 2 is in a flat straight pipe shape, the air inlet end 24 of the first injection pipe 2 is adapted with two first injectors which are arranged side by side and are respectively a first injector 5 and a second first injector 5', in order to increase turbulence of gas and primary air, the air inlet end 24 of the first injection pipe 2 is provided with an injection body 900 for increasing turbulence of gas and primary air, the turbulence body 900 comprises a convex column 901 which is protruded on the surface of the inner wall of the first injection pipe 2, at least two groups of convex columns 901 are arranged at intervals along the axis of the first injection pipe 2, and the corresponding convex columns 901 between the adjacent groups are arranged in a staggered manner.

In order to solve the problem that the increase of the pipe wall of the first injection pipe 2 causes the reduction of the amount of secondary air at the periphery of the pipe wall of the first injection pipe and the blockage of the traditional 'secondary air channel positioned on the side wall of the gas mixing chamber' at the same time of increasing the number of the first injectors, the invention is further characterized in that the special second fire cover 7 comprises a fire cover body, the inner side edge and the outer side edge of the top wall 71 of the fire cover body respectively extend downwards to form an inner wall 72 and an outer wall 73, the outer wall 73 is provided with a main fire hole 731, the inner wall 72 comprises a first inner wall 721 and a second inner wall 722, the first inner wall 721 and the second inner wall 722 extend from the same root and form an included angle with each other, wherein the first inner wall 721 inclines upwards and downwards along the radial direction of the center of the fire cover body, the second inner wall 722 inclines downwards and then upwards along the radial direction of the center of the fire cover body, the first inner wall 721 and the second inner wall 722 jointly enclose an air supplementing cavity 70 communicated with the outside air, so that the air supplementing cavity 70 with narrow two ends and wide center is formed, the pipe wall of the first injection pipe 2 is connected to the joint of the first inner wall 721 and the second inner wall 722, a gap is formed between the pipe wall of the first injection pipe 2 and the air supplementing cavity 70, and the gap forms a secondary air channel 10. Further, a second air mixing chamber 6 is provided which is mounted above the mounting base 20 and below the second fire lid 7, the second air mixing chamber 6 includes an inner wall surface 61 joined to the inner wall 72 and an outer wall surface 62 joined to the outer wall 73, a bottom wall 63 connecting the inner wall surface 61 and the outer wall surface 62, and the second fire lid 7 covering above the inner wall surface 61 and the outer wall surface 62. In order to effectively increase the amount of secondary air at the periphery of the pipe wall of the first injection pipe 2, the first injection pipe 2 comprises a first pipe wall 240 corresponding to the air inlet end 24 and a second pipe wall 230 corresponding to the air outlet end 23, and the distance D1 between the first inner wall 721 and/or the second inner wall 722 and the first air mixing chamber 1 is larger than the distance D2 between the first inner wall 721 and/or the second inner wall 722 and the first pipe wall 240 and the distance D3 between the first inner wall and/or the second inner wall and the second pipe wall 230.

In order to enable the user to control the central fire and the peripheral fire formed by the burner individually, the second gas mixing chamber 6 is mounted on the mounting base 20 and positioned below the second fire cover 7, the second gas mixing chamber 6 comprises an inner wall surface 61 jointed with an inner wall 72 and an outer wall surface 62 jointed with an outer wall 73, a bottom wall 63 connecting the inner wall surface 61 and the outer wall surface 62, and the second fire cover 7 covering the upper parts of the inner wall surface 61 and the outer wall surface 62. The first ejector 5 and the second first ejector 5 'are both arranged on the nozzle holder 8 below the first ejector pipe 2, and the first ejector 5 and the second first ejector 5' are both arranged in the center of the nozzle holder 8 and extend out of the mounting seat 20 above the nozzle holder 8. The conventional bottom cup under the panel is eliminated by the nozzle holder 8, and the first injector 5 and the second first injector 5 'are directly installed through the nozzle holder 8, so that the first injector 5 and the second first injector 5' can directly supplement air through an air channel above the installation seat 20, and the air supplement quantity is sufficient to promote the full combustion of the combustor while the supplement is convenient. In addition, the gas mixing device also comprises a second ejector which is also arranged on the nozzle seat and is arranged at an interval with the first ejector 5 and the second ejector 5', and a second injection pipe which is independent of the first injection pipe 2 and is arranged in the second gas mixing chamber 6, wherein the gas inlet end 41 of the second injection pipe is opposite to the second ejector, and the gas outlet end 42 of the second injection pipe is communicated with the second gas mixing chamber 6. The second ejector also directly supplements air through an air channel above the mounting seat 20, so that the supplementation is convenient, and meanwhile, the sufficient air supplement amount can be ensured to promote the sufficient combustion of the combustor; in addition, the conventional bottom cup positioned below the mounting seat 20 is eliminated, and meanwhile, the second injection pipe is skillfully arranged in the second gas mixing chamber 6, so that the overall height of the combustor can be reduced, and the potential safety hazard caused by gas leakage when the second injection pipe is connected by a seam can be avoided; the invention adopts a mode of a plurality of nozzles and a plurality of injection pipes, overcomes the limitation that the injection pipes are limited in the diameter range of the combustor to cause the size of the injection pipes to be still short, ensures the primary air injection capacity of the combustor and realizes large firepower.

In order to effectively prolong the length of the first injection pipe 2 and avoid the integral height of the upper air inlet burner from being too high, the bottom wall 63 of the second air mixing chamber 6 is specially designed, the bottom wall 63 is formed by respectively extending a first pipe wall 240 corresponding to the air inlet end 24 of the first injection pipe 2 and a second pipe wall 230 corresponding to the air outlet end 23 outwards along the radial direction of the second fire cover 7, the design skillfully prolongs the length of the first injection pipe 2, and simplifies the structure of the bottom wall 63 of the second air mixing chamber 6.

In this embodiment, the two second ejectors are respectively a first second ejector 30 and a second ejector 30 ', and are symmetrically arranged at two sides of the first ejector, and the two second ejection pipes are correspondingly arranged and respectively a first second ejection pipe 40 and a second ejection pipe 40', so as to prevent the overall height of the burner from being too high, and simultaneously supplement primary air on the mounting seat 20 and ensure sufficient amount of the primary air, the secondary air injection burner further comprises a primary air passage 50, and the primary air passage 50 is formed at a part, corresponding to the nozzle seat 8, of the outer wall surface 62 and is locally recessed inwards along the radial direction of the air mixing chamber; the inward concave outer wall surface 62 part is directly used as a separating part 620 for separating the primary air channel 50 and the secondary air channel 10, other separating parts are not required to be additionally added, the structure is simple, the integral height of the burner is not too high, the structure is compact, and the separating part 620 is provided with an air inlet 41 of the second injection pipe and an air inlet end 24 of the first injection pipe 2. In addition, at least one of the bottom walls 63 of the second air mixing chamber 6 is recessed to form a leg 60 at other portions of the periphery of the primary air passage 50, so as to avoid interference between the primary air passage 50 and the secondary air passage 10, and in this embodiment, it is preferable that the bottom wall is recessed to form one portion of the opposite side of the nozzle holder 8, for this reason, the space formed between the adjacent legs 60 communicates the secondary air passage 10 with the outside, and for preventing interference when the primary air and the secondary air are supplemented, the secondary air passage 10 and the primary air passage 50 are disposed independently of each other, and at the same time, since the leg 60 formed by the recessed portion is hollow, not only the first recess 601 for accommodating the first second injecting pipe 40 and the second recess 602 for accommodating the second injecting pipe 40' are formed, but also the overall height of the burner can be effectively reduced.

Finally, the outer wall 73 of the second fire cover 7 of the present invention is provided with two rows of upper and lower main fire holes 731 and first flame stabilizing holes 733 at intervals along the circumferential direction, the outer wall 73 is provided with the first flame stabilizing holes 733 above the gas outlet end 7311 of the main fire holes 731, the outer wall 73 is further provided with a groove 732 communicated with the first flame stabilizing holes 733, and the groove 732 is communicated with the main fire holes 731. To prevent spillage from entering the nozzle holder 8, the outer wall 73 extends outwardly to form a protective umbrella that shields the nozzle holder 8 from the environment. This design brings the following benefits: the outer wall 73 can form a waterproof brim above the nozzle seat 8 to prevent overflow liquid from entering the first ejector and the second ejector on the nozzle seat 8; secondly, the outer wall 73 can be made of a heat insulating material to prevent the flame heat generated by the flame coming out from the main flame hole 731 and the first flame stabilizing hole 733 from interfering with the supplement of the primary air of the first injector and the secondary air of the second injector on the nozzle holder 8; third, the outer wall 73 can be used as a "partition plate" to separate the secondary air for supplying the main fire hole 731 and the first flame stabilizing hole 733 of the second air mixing chamber 6 and the primary air for supplying the first injector and the second injector on the nozzle holder 8. In order to allow the overflowing liquid to flow out of the nozzle holder 8 quickly, the outer wall 73 extends gradually downward from top to bottom radially outward of the second air-mixing chamber 6. In order to facilitate the placement of the first flame cover 3 and the flame-stabilizing inner flame holes 321, the first flame 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 inner flame holes 321 communicated with the first gas mixing chamber 1, second flame-stabilizing holes 322 located above the inner flame holes 321, and third flame-stabilizing holes 324 located below the inner flame holes 321.

The invention also provides a cooker using the above-mentioned upper air intake burner, the liquid containing disc 200 is directly used as the mounting base 20, in order to reduce the heat conduction contacting with the panel 201 or the liquid containing disc 200 and improve the heat efficiency, the second air mixing chamber 6 uses the supporting connection mode of the supporting column 600, as mentioned above, the path of the primary air, the gas and the mixed primary air and gas in the burner is as follows, because the primary air is sucked into the first injector 5 and the second injector 5' of the nozzle base 8 from the outside by the kinetic energy of the gas, the premixed primary air and the gas enter the first air mixing chamber 1 respectively, the mixed primary air and the gas finally pass through the inner fire hole 321 of the first fire cover 3, the second flame stabilizing hole 322 above the inner fire hole 321, the third flame stabilizing hole 324 below the inner fire hole 321 and are ignited together with the secondary air of the external environment, forming an inner ring fire, and further comprising a second fire cover 7 of an outer circumference fire which can be controlled by a user independently, primary air and fuel gas required by the outer circumference fire are input into the second air mixing chamber 6 independently of the first injection pipe 2 by the second injection pipe, and simultaneously, the second air mixing chamber 6 is separated from the first air mixing chamber 1, so that fluid separation of the second air mixing chamber 6 and the first air mixing chamber 1 is realized, and then the fluid separation can be supplied independently, so that the user can control the inflow of the fuel mixture into the first injection pipe 2 and the second injection pipe independently, if the sizes of the outer circumference fire and the central fire are adjusted, the first air inlet pipe 100 connected to the first injector and the adjusting valve of the total air inlet pipe 400 connected with the second air inlet pipe 200 and the third air inlet pipe 300 which are communicated with the first second injector 30 and the second injector 30 'are adjusted, and in addition, because the first injector 30 and the second injector 30' and the second air inlet pipe 2001 and the third air inlet pipe 300 are relative to the third injector A first injector 5 and a second injector 5' are symmetrically designed to facilitate the injection pressure equalization of the injectors.

Claims (15)

1. An upper intake air burner, characterized by: comprises that

The inner side edge and the outer side edge of the top wall (71) of the second fire cover (7) are respectively provided with an inner wall (72) and an outer wall (73) in a downward extending mode, the outer wall (73) is provided with a main fire hole (731), and the inner wall (72) is surrounded to form an air supplementing cavity (70) which is communicated with the outside air and is narrow at two ends and wide in center;

the first ejector pipe (2) is provided with a horizontal pipe (21) and a vertical pipe (22) which are communicated with each other, the horizontal pipe (21) is positioned below the second fire cover (7) and is arranged along the length direction of the air supplementing cavity (70), the vertical pipe (22) is positioned in the center of the air supplementing cavity (70), extends upwards and is provided with a gap with the inner wall (72), the inlet of the horizontal pipe (21) is the air inlet end (24) of the first ejector pipe (2), and the air inlet end (24) is matched with at least one first ejector (5, 5');

and the first fire cover (3) covers the vertical pipe (22) so as to form a first gas mixing chamber (1) in the center.

2. The upper intake burner of claim 1, wherein: first draw and penetrate pipe (2) and be flat straight tube form to the gas inlet end (24) adaptation of first drawing penetrating pipe (2) has two and sets up side by side first sprayer (5, 5').

3. The upper intake burner of claim 2, wherein: the gas inlet end (24) of the first injection pipe (2) is provided with a fluid disturbing body (900) for increasing the turbulence of gas and primary air, and the fluid disturbing body (900) comprises a convex column (901) which is protruded downwards on the inner wall surface of the pipe wall of the first injection pipe (2).

4. The upper intake burner of claim 3, wherein: at least two groups of convex columns (901) are arranged at intervals along the axis of the first injection pipe (2), and the corresponding convex columns (901) between the adjacent groups are arranged in a staggered manner.

5. The upper intake burner of claim 4, wherein: the first injection pipe (2) comprises a first pipe wall (240) corresponding to the air inlet end (24) and a second pipe wall (230) corresponding to the air outlet end (23), and the distance D1 between the first inner wall and/or the second inner wall and the first air mixing chamber (1) is larger than the distance D2 between the first inner wall and/or the second inner wall and the first pipe wall (240) and the distance D3 between the first inner wall and/or the second inner wall and the second pipe wall (230).

6. The upper intake air burner according to any one of claims 1 to 5, wherein: the gas mixing device further comprises a nozzle seat (8) positioned below the first injection pipe (2), the first ejector (5, 5') is arranged at the central position of the nozzle seat (8) and extends out of the mounting seat (20) positioned above the nozzle seat (8), the gas mixing device further comprises a second gas mixing chamber (6) which is arranged on the mounting seat (20) and positioned at the periphery of the first gas mixing chamber (1), the second gas mixing chamber (6) comprises an inner wall surface (61) connected with the inner wall (72), an outer wall surface (62) connected with the outer wall (73), a bottom wall (63) connecting the inner wall surface (61) with the outer wall surface (62), and a second fire cover (7) covering the inner wall surface (61) and the outer wall surface (62).

7. The upper intake burner of claim 6, wherein: the jet nozzle also comprises a second ejector (30, 30 ') which is also arranged on the nozzle seat (8) and is arranged at an interval with the first ejector (5, 5 '), and a second injection pipe (40, 40 ') which is independent of the first injection pipe (2) and is arranged in the second air mixing chamber (6), wherein an air inlet (41) of the second injection pipe (40, 40 ') is opposite to the second ejector (30, 30 '), and an air outlet (42) is communicated with the second air mixing chamber (6).

8. The upper intake burner of claim 7, wherein: the secondary air mixing chamber further comprises a primary air channel (50), wherein the primary air channel (50) is formed at a position, corresponding to the nozzle seat (8), on the outer wall surface (62) and is locally recessed inwards along the radial direction of the second air mixing chamber (6); the inward-concave outer wall surface (62) is directly used as a separating part (620) for separating the primary air channel (50) and the secondary air channel (10), and an air inlet (41) of the second injection pipe and an air inlet (24) of the first injection pipe (2) are formed in the separating part (620).

9. The upper intake burner of claim 8, wherein: at least one part of the bottom wall (63) of the second air mixing chamber (6) is recessed to form a supporting leg (60) at other parts of the periphery of the primary air channel (50), the interval formed between the adjacent supporting legs (60) is communicated with the secondary air channel (10), and the secondary air channel (10) is independent from the primary air channel (50).

10. The upper intake burner of claim 9, wherein: a notch (601, 602) for accommodating the second injection pipe is formed in the supporting leg (60).

11. The upper intake air burner according to any one of claims 7 to 10, wherein: the first fire cover (3) comprises a top cover (31) and an outer ring wall (32) extending downwards from the top cover (31), wherein an inner fire hole (321) communicated with the first gas mixing chamber (1) and a second flame stabilizing hole (322) positioned above and/or below the inner fire hole (321) are formed in the outer ring wall (32).

12. The upper intake burner of claim 11, wherein: the outer wall (73) of the second fire cover (7) extends outwards to form a protective umbrella which is shielded above the nozzle seat (8).

13. The upper intake burner of claim 12, wherein: the outer wall (73) extends gradually downwards from top to bottom radially outwards of the second gas mixing chamber (6).

14. Cooking appliance with an upper inlet air 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. Cooking appliance applying an upper inlet air burner according to any one of claims 1 to 13, comprising a liquid containing tray (200) located below the burner, characterized in that: the liquid containing tray (200) is used as the mounting seat (20).

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