CN210861084U - Upper air inlet burner - Google Patents

Abstract

The utility model relates to an upper air inlet burner, including the base, set up outer loop gas mixing chamber and inner ring fire lid and outer loop fire lid on the base, its characterized in that: the inner ring fire cover is arranged on the central connecting plate, the central connecting plate is provided with a vertical first injection pipe, and the first injection pipe corresponds to the inner ring gas mixing chamber; the base is cylindricly, and the roof central authorities of base are provided with first sprayer and draw and penetrate the pipe relative setting with first, and the roof periphery of base or the outer wall of neighbouring its roof radially inwards cave in towards first sprayer have two at least recesses, and every second sprayer corresponds respective recess to draw the passageway with the second that corresponds separately and set up relatively, compare with prior art, the utility model has the advantages of can make second sprayer and second draw the relative distance grow that penetrates the passageway, the length extension that the passageway was penetrated to the second, and then improve the second and draw the ability of penetrating the passageway.

Description

Upper air inlet burner

Technical Field

The utility model relates to a combustor of gas cooking utensils especially relates to a take binary channels's last air inlet formula's cooking utensils combustor.

Background

At present, the upper air inlet gas stoves in the market are platform type gas stoves and embedded type gas stoves, wherein the burner of the embedded type gas stove is of a single-channel upper air inlet structure, gas enters through a channel, the firepower of the gas is controlled by a valve, and the gas of an inner fire ring cannot be used independently. In order to solve the problems that a single channel does not have independent central fire and the heat load is small, a Chinese patent with the application number of CN98120026.5 (with the publication number of CN1212348A) discloses a gas burner which has simple structure and can independently adjust the central fire and the outer ring fire, that is, such burners are generally provided with a central injector and an outer ring injector, but such gas burners have been found in experiments to have unsatisfactory combustion performance, uneven velocity of primary air supplied to the central flame front and the outer flame front, because the air suction of the central ejector and the outer ring ejector is uneven, the flame length of the central fire and the flame length of the outer ring fire are different due to the incomplete mixing of the gas and the primary air, meanwhile, the ejector pipe is limited by the height of the upper air inlet burner and cannot be too long, so that the channel resistance is large, yellow flame is easy to appear when the power is high, and particularly, the yellow flame is more obvious when the power is low. In order to solve the problem that the top air inlet burner ejector tube cannot be made too long, a chinese patent No. ZL200680014368.7 (No. CN101166934B) of high power dual burner for gas range with multi-ring concentric flame crown provides a burner provided with a minimum of four mixing venturi chambers, a central chamber with vertical axis above the first nozzle and a minimum of three uniformly spaced chambers with inclined axis, which are respectively supplied by different nozzles, although the three chambers with inclined axis can make a large combustion heat without changing the height of the whole burner, in case of the burner with four venturi chambers, the dual burner includes a circular basin-shaped body under the panel, i.e. the term "bottom cup", which contains a central crosspiece with a central nozzle in the center for introducing gas into the mixing chamber of the venturi, meanwhile, peripheral nozzles for guiding coal gas into three cavities with inclined axes are arranged at intervals in the circumferential direction of the first nozzle, the peripheral nozzles are positioned at the periphery of the central nozzle, the peripheral nozzles are positioned at the upstream of a venturi mixing cavity with the inclined axes from 40 degrees to 60 degrees, and due to the limitation of the central crosspiece, the peripheral nozzles can only be positioned at the periphery of the central nozzle in the radial direction, and the inclined length of the venturi mixing cavity with the inclined axes cannot be increased, so that the outer ring combustion performance corresponding to the peripheral venturi mixing cavity is still not ideal, and the existing upper air inlet combustor needs to be further improved.

In addition, the peripheral venturi mixing cavity is only provided with one mixing cavity and is only suitable for an external tooth-shaped crown with a single fire hole, but the crown is easy to block the fire hole when liquid overflows, so that poor working conditions such as flameout, uneven fire and the like are caused, the customer experience is influenced, and the maintenance rate is increased; compare in profile of tooth fire hole or circle fire hole, adopt a seam fire hole to be favorable to reducing the condition appearance that the discharge caused the jam to the fire hole, still have the big problem of the degree of difficulty of supplementary secondary air promptly simultaneously: the inside and outside both sides of strip seam fire hole can contact abundant secondary air, but walk towards the centre of fire hole more, because secondary air has participated in the front end and has burnt, so the air quantity reduces, and secondary air supplyes the difficulty, and middle secondary air supplyes volume has just reduced, causes phenomenons such as yellow fire easily. For example, in the chinese patent No. ZL200610122194.8 (publication No. CN1920383A), "top intake type deep internal rotation burner", which has slit-shaped fire holes with internal rotation, the secondary air can be supplemented to the fire holes only by the inner side of the fire cover inner diameter, but the secondary air goes to the outside of the fire holes, because the secondary air participates in the front end combustion, the amount of air is reduced, the secondary air is difficult to supplement, the supplement amount of the secondary air in the middle and outside is reduced, and the phenomenon of yellow fire is easily caused, so that a top intake burner with strong injection capability and high heat efficiency, which can also well absorb the secondary air to be supplemented, needs to be found.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem that provide one kind to above-mentioned prior art current situation and can be to the fire hole especially rectangular seam formula fire hole, evenly supply secondary air's last air inlet burner.

The utility model aims to solve the second technical problem that to above-mentioned prior art current situation and provide an upper air inlet burner of difficult jam sprayer of overflow.

The utility model aims to solve the third technical problem that to above-mentioned prior art current situation and provide one kind under the condition of the height that does not change whole combustor, the long last air inlet burner can effectively be done to the length that draws of penetrating the pipe that the periphery hybrid chamber corresponds.

The utility model aims to solve the fourth technical problem that provide one kind to above-mentioned prior art current situation and under the condition of the height that does not change whole combustor, the length that draws of penetrating the pipe that central hybrid chamber corresponds can effectively be long last air inlet burner.

For solving the first technical problem, the utility model discloses a technical scheme be: this go up air inlet burner includes:

a base;

the outer loop gas mixing chamber sets up on the base, including being the annular and inner circle wall and the diapire of outer lane wall and connection inner circle wall and outer lane wall that concentric interval set up, the inner circle wall encloses into annular cavity, inner circle wall and outer lane wall top cover have outer ring fire lid, its characterized in that:

the outer ring fire cover comprises an annular body, the annular body comprises an annular top wall, an inner ring wall and an outer ring wall, the inner ring wall and the outer ring wall vertically or obliquely extend downwards from the inner edge and the outer edge of the annular top wall, the inner ring wall abuts against the inner ring wall surface, the outer ring wall abuts against the outer ring wall surface, the annular top wall of the outer ring fire cover obliquely downwards inclines from outside to inside, the inner ring wall obliquely downwards inclines from outside to inside, an inclination angle α of the annular top wall relative to the horizontal plane and an inclination angle β of the inner ring wall relative to the horizontal plane meet the requirement that α is less than β, and the annular top wall and the inner ring wall are provided with radial main fire holes which are distributed at intervals along the.

Furthermore, in order to enable the distance between the second ejector and the air inlet of the second injection passage to be relatively close and improve the injection capacity, the gas injection device further comprises a central connecting plate crossing the annular cavity and an inner annular fire cover arranged on the central connecting plate, and an inner annular gas mixing chamber is formed by the central connecting plate and the central connecting plate, the central connecting plate is provided with a vertical first injection pipe, and the first injection pipe corresponds to the inner annular gas mixing chamber;

the bottom wall is provided with at least two independent second injection channels at intervals along the circumferential direction, the second injection channels are provided with axes inclined relative to the horizontal plane, and the outer ring gas mixing chamber corresponds to the second injection channels;

the base is columnar, a first ejector is arranged in the center of the top wall of the base and is opposite to the first injection pipe, a second ejector is arranged on the periphery of the top wall of the base or on the outer wall of the top wall of the base, the second ejector corresponds to the second injection passage, and the second ejector is higher than the first ejector.

In order to meet the requirement that the fuel gas firepower of the combustor is regulated and controlled by a valve, the inner rotary fire formed by the radial main fire of the inner ring wall and the outer rotary fire formed by the radial main fire hole of the annular top wall can be simultaneously used, the inner rotary fire and the outer rotary fire can also be independently used, particularly, flame in the circumferential direction of the inner part, the center and the outer part basically has no turbulence and interference, and simultaneously has the cooking function of small fire. The outer ring air mixing chamber can be divided into a first outer ring air mixing chamber positioned on the inner side and a second outer ring air mixing chamber positioned on the outer side, the second ejector respectively and correspondingly gives fuel mixtures to the first outer ring air mixing chamber and the second outer ring air mixing chamber, and the first outer ring air mixing chamber and the second outer ring air mixing chamber are separated in fluid, so that the fuel mixtures can be supplied independently.

In order to further solve the second technical problem, preferably, each of the second injection passages is a radial venturi tube, the air inlets of the second injection passages are opposite to the corresponding second ejectors, the air outlets of the second injection passages extend to the bottom wall of the outer ring air mixing chamber, a circle of convex wall extends downwards from the wall surface of the outer ring, and the convex wall forms a waterproof ring of the second injection passage. In order to make the second injection passage longer, the second injection passage is preferably a radial venturi tube, the air inlets of the second injection passages are opposite to the corresponding second ejectors, and the air outlets of the second injection passages extend to the bottom wall of the outer ring air mixing chamber.

In order to supplement secondary air in the fire outlet area of the inner ring fire cover, the bottom wall of the outer ring air mixing chamber is provided with at least two secondary air channels which are spaced along the circumferential direction and are recessed upwards from bottom to top, and the secondary air channels are communicated with the outside and the annular cavity.

Further, the bottom wall of the outer ring air mixing chamber comprises a first bottom wall corresponding to the secondary air channel, the first bottom wall is gradually inclined downwards from top to bottom, and the lower end of the convex wall is lower than the lower end of the first bottom wall. The overflow liquid flowing down from the pot in the cooking process is easy to be protected in the first step by the convex wall as the waterproof ring before flowing into the outer ring air mixing chamber.

In order to avoid overflow liquid from entering the second ejector along each radial Venturi tube after passing through the waterproof ring, the outer part of the first bottom wall adjacent to the convex wall is gradually inclined downwards from top to bottom. The first bottom wall is gradually inclined downwards from top to bottom, so that overflowing liquid can be prevented from entering the second ejector from outside to inside along each radial Venturi tube, and the second step of protection is performed.

In order to further solve the third technical problem, preferably, at least two recesses are recessed radially inward toward the first injector at the periphery of the top wall of the base or an outer wall adjacent to the top wall of the base, and each second injector corresponds to a respective recess and is arranged opposite to a respective corresponding second injection passage. The conventional bottom cup positioned below the liquid containing disc is omitted, the base is partially higher than the circular shape above the liquid containing disc, the second ejector is arranged on the periphery of the top wall of the base or is adjacent to the outer wall of the top wall of the base, at least two concave grooves are formed in the outer wall of the top wall of the base in a concave mode towards the radial direction of the first ejector, the relative distance between the second ejector and the first ejector is reduced, the relative distance between the second ejector and the second injection channel is increased, in order to enable the distance between the second ejector and the air inlet of the second injection channel to be relatively close, the length of the second injection channel can be lengthened under the condition that the height of the integral combustor is not changed, in addition, the second ejectors are not interfered with each other, and the injection capacity of the second injection channel is improved.

Further, the base is provided with vertical chambers corresponding to the dimples, the upper ends of the vertical chambers are closed to be blind ends, the lower parts of the vertical chambers are communicated with each other, and the second ejector is arranged on the side ends of the upper ends and the closed ends of the vertical chambers. The vertical chambers are independently arranged relative to the concave cavity and are communicated with each other at the bottom, and by means of the closed end face, the separation of the phase fluid of the first ejector and the phase fluid of the second ejector is effectively realized, so that a user is allowed to independently control the inflow of the fuel mixture entering the first injection pipe and the second injection passage.

In order to realize the connection between the central connecting plate and the outer ring gas mixing chamber and the base and the overall stability and the convenience of installation of the burner, it is preferable that the lower surface of the central connecting plate is provided with a support member extending vertically and downwardly at the periphery of the first injection pipe, and the inner periphery of the peripheral wall of the cavity is correspondingly provided with a support table for supporting the support member.

In order to prevent the overflow liquid from blocking the air inlet of the second injection passage, the side part of the central connecting plate outside the first injection pipe forms a waterproof brim positioned above the air inlet of the second injection passage.

In order to effectively lengthen the length of the first injection pipe corresponding to the inner ring gas mixing chamber, the side part of the central connecting plate is low, the central position is high, the side part of the central connecting plate forms the part of the pipe wall of the second injection passage, and the upper surface of the central position is provided with a mounting groove for mounting the inner ring fire cover in a downward concave manner.

In order to avoid that an annular cavity surrounded by the wall surfaces of the inner ring is shielded by the central connecting plate, and further the secondary air in the annular cavity is not enough to supplement the radial main fire holes of the inner ring wall, an air supplement channel which is communicated with the outside and used for supplementing the secondary air to the radial main fire holes of the inner ring wall is formed at the interval between the central connecting plate and the wall surface of the inner ring.

Compared with the prior art, the utility model has the advantages of the difficulty to the even supplementary secondary air of strip seam form fire hole, the cyclic annular roof and the interior rampart of outer loop fire lid all have radial main fire hole, the cyclic annular roof of outer loop fire lid inclines down from the outside to the inside slant, the interior rampart inclines down from the outside to the inside, and satisfy α < β between the inclination α of cyclic annular roof relative horizontal plane and the inclination β of interior rampart relative horizontal plane, and cyclic annular roof and interior rampart all have along the radial main fire hole of circumference interval distribution, the relative horizontal plane becomes the great interior rampart of inclination β, radial main fire hole heats each other fewly, ascending flame is favorable to promoting the thermal efficiency, but the secondary air of entrainment only comes from the annular cavity that the inner circle wall encloses by dependence inner circle, the entrainment ability is weaker, the flue gas is high, the cyclic annular roof that relative horizontal plane becomes inclination α is less, have the better entrainment ability around the circumferencial direction, but there is the state that flame portion separation pot is far away from, lean on the flame actually burning on, lead to the fire, for promoting, for the outer loop fire lid and the very little cyclic annular roof of outer loop, the radial vortex can make the radial vortex draw the radial vortex wall to have the radial outward the radial vortex defect that the radial internal ring vortex wall or the radial vortex wall that the radial vortex defect that the radial vortex is set up the radial internal vortex wall that the internal vortex efficiency is.

Drawings

Fig. 1 is a schematic structural view of an upper air inlet burner in an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of an outer ring fire cover in an embodiment of the present invention;

FIG. 4 is a schematic structural view of an outer ring air mixing chamber in an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 at another angle;

FIG. 6 is a cross-sectional view at an angle of FIG. 1;

FIG. 7 is a cross-sectional view at another angle from FIG. 1;

FIG. 8 is a cross-sectional view at yet another angle of FIG. 1;

fig. 9 is a schematic structural diagram of a base according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of fig. 9.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 10, for the best embodiment of the present invention, the present upper air inlet burner includes a base 1, a first injector 2 and at least two second injectors located at the periphery of the first injector 2, which are independent of each other, are accommodated in the base 1, an outer ring air mixing chamber 4 is disposed above the base 1, the outer ring air mixing chamber 4 includes an inner ring wall 41 and an outer ring wall 42, which are annular and concentrically disposed at an interval, and a bottom wall 43 connecting the inner ring wall 41 and the outer ring wall 42, an outer ring fire cover 5 covers the inner ring wall 41 and the outer ring wall 42, and the inner ring wall 41 encloses an annular cavity 410; the outer ring fire cover 5 covers the outer ring gas mixing chamber 4, the fire cover further comprises a central connecting plate 7 crossing the annular cavity 410, the inner ring fire cover 6 is arranged on the central connecting plate 7 and forms an inner ring gas mixing chamber 61 with the central connecting plate 7, the central connecting plate 7 is provided with a vertical first injection pipe 71, the first injection pipe 71 corresponds to the inner ring gas mixing chamber 61, and at least two independent second injection channels are arranged along the circumferential direction and at intervals of the bottom wall 43 of the outer ring gas mixing chamber 4, the second injection channels are provided with axes inclined relative to the horizontal plane, and the outer ring gas mixing chamber 4 corresponds to the second injection channels; in order to realize that the length of the second injection passage can be lengthened under the condition of not changing the height of the whole burner, the base 1 of the embodiment is cylindrical, the center of the top wall of the base 1 is provided with the first injector 2 and is arranged opposite to the first injection pipe 71, the periphery of the top wall of the base 1 or the outer wall adjacent to the top wall of the base 1 is provided with at least two concave grooves 11 inwards towards the radial direction of the first injector 2, each second injector corresponds to the corresponding concave groove 11 and is arranged opposite to the corresponding second injection passage, because the second injector is arranged on the periphery of the top wall of the base 1 or the outer wall adjacent to the top wall of the base 1 and is provided with at least two concave grooves 11 inwards towards the radial direction of the first injector 2, the relative distance between the second injector and the first injector 2 is reduced, the relative distance between the second injector and the second injection passage is increased, and in order to ensure that the distance between the second injector and the air inlet of the second injection passage is relatively close, the length of the second injection channel can be lengthened under the condition that the height of the whole combustor is not changed, in addition, the second injectors are not interfered with each other, and the injection capacity of the second injection channel is further improved.

Similarly, in order to make the length of the first injection pipe 71 longer without changing the height of the whole burner, the central part of the top wall of the base 1 outside the recess 11 is recessed downwards to form a cavity 12, the first injector 2 is arranged on the bottom wall 43 of the cavity 12, and the first injection pipe 71 extends into the cavity 12 and is arranged opposite to the first injector 2. The central part of the base 1 is provided with a concave cavity 12 for the first injection pipe 71 to extend into, so that the first injection pipe 71 can be made longer without changing the height of the whole burner, the flame of the upper air inlet burner is short, uniform and powerful, and the defects of yellow flame, tempering and the like can not occur. In addition, in order to enable the second ejector to be relatively close to the air inlet of the second injection passage and improve the injection capacity, the second ejector is higher than the first ejector 2. The base 1 is provided with vertical chambers 13 corresponding to the dimples 11, the upper ends of the vertical chambers 13 are closed to be blind ends, the lower parts of the vertical chambers 13 are communicated with each other, and the second ejector is arranged at the side end of the closed end of the upper end of the vertical chamber 13. The vertical chambers 13 are relatively concave and independently arranged, and the vertical chambers 13 are mutually communicated at the bottoms, so that the fluid separation of the first ejector 2 and the second ejector is effectively realized by virtue of the closed end surface, and a user is allowed to independently control the inflow of the fuel mixture entering the first injection pipe 71 and the second injection passage. In order to realize the connection between the central connecting plate 7 and the outer ring gas mixing chamber 4 and the base 1 and the overall stability and convenience of installation of the burner, the lower surface of the central connecting plate 7 is provided with a support 9 extending vertically and downwards at the periphery of the first injection pipe 71, and the inner periphery of the peripheral wall of the cavity 12 is correspondingly provided with a supporting table 121 for supporting the support 9.

In the embodiment, the outer ring fire cover 5 comprises an annular body, the annular body comprises an annular top wall 51, an inner ring wall 52 and an outer ring wall 53, the inner ring wall 52 and the outer ring wall 53 vertically or obliquely extend downwards from the inner edge and the outer edge of the annular top wall 51, the inner ring wall 52 abuts against the inner ring wall 41, the outer ring wall 53 abuts against the outer ring wall 42, the annular top wall 51 and/or the inner ring wall 52 of the outer ring fire cover 5 are provided with radial main fire holes 50 distributed at intervals along the circumferential direction, the radial main fire holes 50 of the outer ring fire cover 5 are slit type fire holes to form inner spiral fire or outer spiral fire, and if the annular top wall 51 or the inner ring wall 52 is provided with the radial main fire holes 50, the occurrence of the situation that the fire holes are blocked by spilled liquid is favorably reduced; or cyclic annular roof 51 and interior rampart 52 all have radial main fire hole 50, when cyclic annular roof 51 and interior rampart 52 all have radial main fire hole 50, then compare and establish alone on cyclic annular roof 51 or interior rampart 52 time, radial main fire hole 50's length can set up shorter, under the state of equal secondary air make-up volume, and the two homoenergetic contacts abundant secondary air, avoids causing phenomenons such as yellow fire. To avoid yellow fire, the annular top wall 51 and the inner annular wall 52 both have radial main fire holes 50 for illustration:

the annular top wall 51 of the outer annular fire cover 5 inclines downwards from outside to inside in an inclined mode, the inner annular wall 52 inclines downwards from outside to inside in an inclined mode, an inclination angle α of the annular top wall 51 relative to a horizontal plane and an inclination angle β of the inner annular wall 52 relative to the horizontal plane meet α < β, the annular top wall 51 and the inner annular wall 52 are provided with radial main fire holes 50 distributed at intervals in the circumferential direction, the inner annular wall 52 formed by the inclination angle β relative to the horizontal plane is large, the radial main fire holes 50 are heated little mutually, upward flames are beneficial to improving heat efficiency, sucked secondary air only comes from an annular cavity 410 enclosed by the inner annular wall 41 and is weak in entrainment capacity and high in smoke, the annular top wall 51 formed by the inclination angle α relative to the horizontal plane has good entrainment capacity around the circumferential direction, a state that a flame part is far away from a boiler exists, downward flames are actually upwards flames are burnt, limitation efficiency is low, in order to improve uniformity of the annular top wall 51 of the outer annular fire cover 5 and overall flame shape, the annular top wall 51 of the outer annular fire cover 5 has good inward/or outward spiral, the inner annular fire holes 52 are radially outward, even if the inner annular top wall 50 has good entrainment capacity, the inner annular wall 50, the inner annular top wall 50 has good radial flame absorption capacity, the defects of the inner annular wall 50, the inner flame holes 50, the inner annular wall 50 can be sufficiently compensated for the defects of the inner annular top wall 50, the inner flame holes 50, the inner annular top wall 50, the inner flame holes 50 can be arranged radially.

In order to satisfy the condition that the gas fire power of the burner is controlled by valve adjustment, the inner rotary fire formed by the radial main fire hole 50 of the inner ring wall 52 and the outer rotary fire formed by the radial main fire hole 50 of the annular top wall 51 can be used simultaneously, or the inner rotary fire and the outer rotary fire can be used independently, particularly, the flame in the circumferential directions of the inner part, the center and the outer part basically has no turbulence and interference, and simultaneously has the cooking function of small fire, the bottom wall 43 of the outer ring gas mixing chamber 4 is provided with an annular partition plate 431, the annular partition plate 431 divides the outer ring gas mixing chamber 4 into two independent chambers, each independent chamber is communicated with the corresponding second injection channel, the outer ring gas mixing chamber 4 can be divided into a first outer ring gas mixing chamber 44 positioned at the inner side and a second outer ring gas mixing chamber 45 positioned at the outer side, and the second injectors respectively correspondingly give fuel mixtures to the first outer ring gas mixing chamber 44 and the second outer ring gas mixing, the first outer ring plenum 44 and the second outer ring plenum 45 are fluidly separated and thus can be supplied separately. This embodiment takes 4 second injectors as an example, for example in a burner with two venturi lumens, each individual venturi lumen must be loaded with 2kW in order to obtain 4 kW; in the case of a burner with four venturi lumens, reducing the load of each venturi lumen to 1.25kW, minus 62.5%, a maximum power of 5kW is obtained; correspondingly, the number of the second injection passages is 4, and the second injection passages comprise a first second injection passage 81, a second injection passage 82, a third second injection passage 83 and a fourth second injection passage 84, the first second injection passage 81 and the second injection passage 82 are communicated with the first outer ring air mixing chamber 44, and the third second injection passage 83 and the fourth second injection passage 84 are communicated with the second outer ring air mixing chamber 45. The first second injection passage 81, the second injection passage 82, the third second injection passage 83 and the fourth second injection passage 84 are radial venturi tubes, the air inlets of the second injection passages are opposite to the corresponding second ejectors, each second ejector comprises a first second ejector 31 corresponding to the first second injection passage 81, a second ejector 32 corresponding to the second injection passage 82, a third second ejector 33 corresponding to the third second injection passage 83 and a fourth corresponding ejector 34, the air outlets of the first second injection passage 81 and the second injection passage 82 extend to the bottom wall 43 of the first outer ring air mixing chamber 44 and are communicated with the first outer ring air mixing chamber 44, and the air outlets of the third second injection passage 83 extend to the bottom wall 43 of the second outer ring air mixing chamber 45 and are communicated with the second outer ring air mixing chamber 45. The side part 74 of the central connecting plate 7 outside the first injection pipe 71 forms a waterproof eave above the gas inlet of each second injection passage to prevent overflow from blocking the gas inlet of the second injection passage, in order to effectively lengthen the length of the first injection pipe 71 corresponding to the inner ring gas mixing chamber 61, the side part of the central connecting plate 7 is low, the central position is high, the side part of the central connecting plate 7 forms part of the pipe wall of the second injection passage, and the upper surface of the central position is provided with a mounting groove 73 for mounting the inner ring fire cover 6 in a downward concave manner. Finally, in order to avoid that the annular cavity 410 surrounded by the inner ring wall surface 41 is shielded by the central connecting plate 7, and further the secondary air in the annular cavity 410 is not enough to supplement the radial main fire holes 50 of the inner ring wall 52, the gap between the central connecting plate 7 and the inner ring wall surface 41 forms an air supplementing channel which is communicated with the outside and is used for supplementing the secondary air to the radial main fire holes 50 of the inner ring wall 52.

Referring to fig. 7 and 8, as described above, the primary air, the gas, and the mixed primary air and gas are routed inside the burner (see the dashed line direction) as follows, due to the low pressure caused by the gas injection from the first injector 2 to the first injection pipe 71 and the inner ring gas mixing chamber 61, the primary air is sucked into the cavity 12 of the base 1 from the outside by the kinetic energy of the gas itself, the primary air and the gas are premixed, and finally enter the inner ring gas mixing chamber 61, and the mixed primary air and the gas finally pass through the inner fire hole of the inner ring fire cover 6 and are ignited together with the secondary air of the external environment, so as to form the inner ring fire. The fire cover further comprises an inner rotary fire and an outer rotary fire which can enable a user to control independently, primary air and fuel gas required by the inner rotary fire are input into the first outer ring gas mixing chamber 44 through the first second injection passage I81 and the second injection passage II 82 independently of the first injection pipe 71, primary air and fuel gas required by the outer rotary fire are input into the second outer ring gas mixing chamber 45 through the third second injection passage 83 and independently of the first injection pipe 71, meanwhile, the first outer ring gas mixing chamber 44 and the second outer ring gas mixing chamber 45 are separated from the inner ring gas mixing chamber 61, and therefore fluid separation of the first outer ring gas mixing chamber 44 and the second outer ring gas mixing chamber 45 and the inner ring gas mixing chamber 61 is achieved in the mode, and then the first outer ring gas mixing chamber and the second outer ring gas mixing chamber can be supplied independently to allow the user to control independently to enter the first injection pipe 71, the first second injection passage I81, the second injection passage II 82, the third injection passage 83 and inflow of a middle fuel mixture, if the sizes of the inner rotary fire and the outer rotary fire are required to be adjusted, adjusting valves connected with air inlet pipes arranged on the periphery of the base 1 and communicated with the vertical cavity 13 are adjusted.

Finally, in order to avoid the blockage of the first second ejector 31, the second ejector 32, the third second ejector 33 and the fourth second ejector 34 by the overflowing liquid, a circle of convex wall 421 extends downwards from the outer ring wall surface 42, the convex wall 421 forms a waterproof ring of the first second injection passage 81, the second injection passage 82, the third second injection passage 83, and before the overflowing liquid flowing down from the cooker flows into the outer ring gas mixing chamber 4 in the cooking process, the overflowing liquid is easily protected in a first step by the convex wall 531 serving as the waterproof ring. The bottom wall 43 of the outer ring air mixing chamber 4 is provided with at least two secondary air channels 430 which are spaced along the circumferential direction and are recessed upwards from bottom to top, and the secondary air channels 430 are communicated with the outside and the annular cavity 410 to supplement secondary air in the fire outlet area of the inner ring fire cover; the bottom wall 43 of the outer ring air mixing chamber includes a first bottom wall 432 corresponding to the secondary air channel 430, the first bottom wall 432 is gradually inclined downwards from top to bottom, the lower end of the convex wall 421 is lower than the lower end of the first bottom wall 432, the outer part of the first bottom wall 432 adjacent to the convex wall 421 is gradually inclined downwards from top to bottom, and the first bottom wall 432 is gradually inclined downwards from top to bottom, so that overflowing liquid can be prevented from entering the respective second ejector from outside to inside along each radial venturi tube, and the second step of protection can be performed.

Claims (13)

1. An upper intake air burner comprising:

a base (1);

outer loop gas mixing chamber (4), set up on base (1), including inner circle wall (41) and outer lane wall (42) and diapire (43) of connecting inner circle wall (41) and outer lane wall (42) that are the annular and concentric interval setting, inner circle wall (41) enclose into annular cavity (410), inner circle wall (41) and outer lane wall (42) top cover have outer ring fire lid (5), its characterized in that:

the outer ring fire cover (5) comprises an annular body, the annular body comprises an annular top wall (51), an inner ring wall (52) and an outer ring wall (53), the inner ring wall (52) and the outer ring wall (53) vertically or obliquely extend downwards from the inner edge and the outer edge of the annular top wall (51), the inner ring wall (52) abuts against an inner ring wall surface (41), the outer ring wall (53) abuts against an outer ring wall surface (42), the annular top wall (51) of the outer ring fire cover (5) is obliquely downwards inclined from outside to inside, the inner ring wall (52) is obliquely downwards inclined from outside to inside, an inclined angle α of the annular top wall (51) relative to the horizontal plane and an inclined angle β of the inner ring wall (52) relative to the horizontal plane meet the requirement that α is less than β, and the annular top wall (51) and the inner ring wall (52) are provided with radial main fire holes (50) distributed.

2. The upper intake burner of claim 1, wherein: the gas stove also comprises a central connecting plate (7) crossing the annular cavity (410), and an inner ring fire cover (6) arranged on the central connecting plate (7), and an inner ring gas mixing chamber (61) is formed by the central connecting plate (7), the central connecting plate (7) is provided with a vertical first injection pipe (71), and the first injection pipe (71) corresponds to the inner ring gas mixing chamber (61);

the bottom wall (43) is provided with at least two independent second injection channels at intervals along the circumferential direction, the second injection channels are provided with axes inclined relative to the horizontal plane, and the outer ring gas mixing chamber (4) corresponds to the second injection channels;

the base (1) is columnar, the top wall center of base (1) is provided with first sprayer (2) and with first drawing penetrates pipe (71) and sets up relatively, the top wall periphery of base (1) or the outer wall of neighbouring its top wall are provided with the second sprayer, this second sprayer with correspond separately the second draws penetrates the passageway and sets up relatively, the second sprayer all be higher than first sprayer (2).

3. The upper intake burner of claim 2, wherein: and an annular partition plate (431) is arranged on the bottom wall (43) of the outer ring gas mixing chamber (4), the outer ring gas mixing chamber (4) is divided into two independent chambers by the annular partition plate (431), and each independent chamber is communicated with the corresponding second injection channel.

4. The upper intake burner of claim 3, wherein: each second draws penetrates the passageway and is radial venturi, the second draws the gas inlet that penetrates the passageway with respectively corresponding the second sprayer is relative, the gas outlet that the second draws the passageway extends to diapire (43) of outer loop gas mixing chamber (4), outer lane wall (42) downwardly extending has round protruding wall (421), protruding wall (421) constitute the second draws the waterproof circle that penetrates the passageway.

5. The upper intake burner of claim 4, wherein: the bottom wall (43) of the outer ring air mixing chamber is provided with at least two secondary air channels (430) which are spaced along the circumferential direction and are recessed upwards from bottom to top, and the secondary air channels (430) are communicated with the outside and the annular cavity (410).

6. The upper intake burner of claim 5, wherein: the bottom wall (43) of the outer ring air mixing chamber (4) comprises a first bottom wall (432) corresponding to the secondary air channel (430), the first bottom wall (432) is gradually inclined downwards from top to bottom, and the lower end of the convex wall (421) is lower than the lower end of the first bottom wall (432).

7. The upper intake burner of claim 6, wherein: the first bottom wall (432) is gradually inclined downwards from top to bottom adjacent to the outer part of the convex wall (421).

8. The upper intake air burner according to any one of claims 5 to 7, wherein: at least two concave grooves (11) are formed in the periphery of the top wall of the base (1) or the outer wall close to the top wall of the base towards the radial direction inwards of the first ejector (2), and each second ejector corresponds to the corresponding concave groove (11) and is arranged opposite to the corresponding second ejection channel.

9. The upper intake burner of claim 8, wherein: the base (1) is provided with a vertical chamber (13) corresponding to the concave groove (11), the upper end of the vertical chamber (13) is closed to be a blind end, the lower parts of the vertical chambers (13) are communicated with each other, and the second ejector is arranged at the side end of the closed end of the upper end of the vertical chamber (13).

10. The upper intake burner of claim 9, wherein: the lower surface of the central connecting plate (7) is provided with a supporting piece (9) which vertically extends downwards on the periphery of the first injection pipe (71), and the inner periphery of the peripheral wall of the cavity (12) is correspondingly provided with a supporting table (121) for supporting the supporting piece (9).

11. The upper intake burner of claim 10, wherein: and the side part (74) of the central connecting plate (7) outside the first injection pipe (71) forms a waterproof brim positioned above the air inlet of the second injection passage.

12. The upper intake burner of claim 11, wherein: the lateral part of central connecting plate (7) is low, central point is high, lateral part (74) of central connecting plate (7) constitute the part of second draw and penetrate the pipe wall of passageway to upper surface in central point is equipped with downwards the concavity and is used for installing mounting groove (73) of inner ring fire lid (6).

13. The upper intake air burner according to any one of claims 9 to 12, wherein: the interval between the central connecting plate (7) and the inner ring wall surface (41) forms a supplementary opening for supplementing secondary air to the radial main fire hole (50) of the inner ring wall (52) by the secondary air channel (430).

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