Upward air intake burner

Abstract

The present invention relates to an upper air inlet burner, comprising a base, an outer ring air mixing chamber arranged on the base, and an inner ring fire cover and an outer ring fire cover, characterized in that: it also comprises a central connecting plate, the inner ring fire cover is arranged on the central connecting plate, the central connecting plate has a vertical first ejection pipe, and the first ejection pipe corresponds to the inner ring air mixing chamber; the base is columnar, a first injector is arranged at the center of the top wall of the base and is arranged opposite to the first ejection pipe, the periphery of the top wall of the base or the outer wall adjacent to the top wall thereof is radially inwardly recessed with at least two recesses toward the first injector, each second injector corresponds to its own recess, and is arranged opposite to its own corresponding second ejection channel. Compared with the prior art, the advantage of the present invention is that the relative distance between the second injector and the second ejection channel can be increased, the length of the second ejection channel can be lengthened, and the ejection capacity of the second ejection channel can be improved.

Description

Technical Field

[0001] The invention relates to a burner of a gas cooker, in particular to an upper air inlet type cooker burner with double channels. Background Art

[0002] At present, there are top-inlet gas stoves on the market, such as platform gas stoves and embedded gas stoves. The burner of the embedded gas stove is a single-channel top-inlet structure. The gas enters through one channel, and the gas fire is controlled by a valve. The inner fire ring gas cannot be used alone. In order to solve the problem of single channel, i.e., no independent center fire and small heat load, a Chinese patent with application number CN98120026.5 (publication number CN1212348A) discloses a gas burner with simple structure and capable of independently adjusting the center fire and outer ring fire. That is, this burner is generally provided with a center injector and an outer ring injector. However, it is found in experiments that the combustion performance of this gas burner is not ideal, the speed of primary air supply to the center flame head and the outer flame head is uneven, and due to the uneven air intake of the center injector and the outer ring injector, the incomplete mixing of the gas and the primary air will also cause the flame lengths of the center fire and the outer ring fire to be different. At the same time, the ejector tube is limited by the height of the upper air inlet burner and cannot be made too long, resulting in large channel resistance. Yellow flames are prone to appear when the power is high, especially at low fire level, the yellow flame is more obvious. In order to solve the problem that the ejector tube of the upper air inlet burner cannot be made too long, a Chinese invention patent with patent number ZL200680014368.7 (authorization announcement number CN101166934B) "Gas stove high-power double burner with multi-circle concentric flame crown" provides a burner with at least four mixed Venturi tube chambers, a central cavity with a vertical axis above the first nozzle and at least three cavities with inclined axes evenly spaced apart, which are respectively supplied by different nozzles. In the case of a burner with four Venturi tube chambers, although the three cavities with inclined axes can obtain greater combustion heat without changing the height of the overall burner, the double burner includes a position The circular basin-shaped body below the panel is referred to as the "bottom cup", and the circular basin-shaped body contains a central cross bar, the center of which has a central nozzle for introducing the coal gas into the Venturi mixing chamber, and at the same time, peripheral nozzles for introducing the coal gas into three cavities with inclined axes are arranged at intervals on the circumference of the first nozzle, and the peripheral nozzles are located at the periphery of the central nozzle. The peripheral nozzles are located upstream of the Venturi mixing chamber with an inclined axis from 40 degrees to 60 degrees. Due to the limitation of the central cross bar, the peripheral nozzles can only be located at the periphery of the central nozzle in the radial direction, and the inclined length of the Venturi mixing chamber with an inclined axis cannot be lengthened, so that the outer ring combustion performance corresponding to the peripheral Venturi mixing chamber is still not ideal, and further improvements are needed to the existing upper air inlet burner.

[0003] In addition, the peripheral venturi mixing chamber has only one mixing chamber, which is only suitable for an external toothed furnace crown with a single fire hole. However, the furnace crown is prone to block the fire hole when there is overflow, resulting in flameout, uneven fire and other adverse working conditions, affecting customer experience and increasing the maintenance rate. Compared with toothed fire holes or round fire holes, the use of slit fire holes is beneficial to reducing the blockage of the fire holes caused by overflow. At the same time, it also has the problem of difficulty in replenishing secondary air, namely: the inner and outer sides of the slit fire hole can be exposed to sufficient secondary air, but the closer to the middle of the fire hole, because the secondary air participates in the front-end combustion, the air volume decreases, and the secondary air replenishment is difficult, and the amount of secondary air replenished in the middle is reduced, which is easy to cause yellow fire and other phenomena. For example, the Chinese invention patent "Upward Air Inlet Deep Inward Rotation Burner" with patent number ZL200610122194.8 (publication number CN1920383A) has an inward-rotating slit-shaped fire hole, and the secondary air can only be supplemented to the fire hole by relying on the inner side of the inner diameter of the fire cover. However, the further to the outside of the fire hole, because the secondary air participates in the front-end combustion, the air volume decreases, and the secondary air replenishment is difficult. The secondary air replenishment in the middle and outside is reduced, which easily causes yellow flames and other phenomena. Therefore, it is necessary to find an upward air inlet burner that has both strong entrainment capability and can well suck the required secondary air and high thermal efficiency. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide an upper air inlet burner in response to the above-mentioned prior art status, in which the length of the ejector tube corresponding to the peripheral mixing chamber can be effectively lengthened without changing the height of the overall burner.

[0005] The second technical problem to be solved by the present invention is to provide an upper air inlet burner in which the length of the ejector tube corresponding to the central mixing chamber can be effectively lengthened without changing the height of the overall burner, in response to the above-mentioned existing technical status.

[0006] The third technical problem to be solved by the present invention is to provide an upper air inlet burner capable of evenly supplying secondary air to the fire holes, especially the long slit-type fire holes, in response to the above-mentioned existing technical status.

[0007] The fourth technical problem to be solved by the present invention is to provide an upward air inlet burner which is less likely to produce yellow flames and weak firepower in response to the above-mentioned existing technical status.

[0008] In order to solve the above-mentioned first technical problem, the technical solution adopted by the present invention is: the upper air inlet burner comprises:

[0009] A base, wherein the base contains a mutually independent first injector and at least two second injectors located outside the first injector;

[0010] An outer ring gas mixing chamber is arranged on the base, comprising an inner ring wall surface and an outer ring wall surface which are arranged concentrically and spaced apart in a ring shape, and a bottom wall connecting the inner ring wall surface and the outer ring wall surface, the inner ring wall surface and the outer ring wall surface are covered with an outer ring fire cover, and the inner ring wall surface forms an annular cavity; and

[0011] A fire cover, comprising an inner ring fire cover and an outer ring fire cover, wherein the outer ring fire cover covers the outer ring gas mixing chamber;

[0012] Features:

[0013] It also includes a central connecting plate spanning the annular cavity, the inner ring fire cover is arranged on the central connecting plate, and forms an inner ring gas mixing chamber with the central connecting plate, the central connecting plate has a vertical first ejector pipe, and the first ejector pipe corresponds to the inner ring gas mixing chamber;

[0014] The bottom wall is provided with at least two independent second ejection channels at intervals along the circumferential direction, the second ejection channels have axes inclined relative to the horizontal plane, and the outer annular gas mixing chamber corresponds to the second ejection channels;

[0015] The base is columnar, and a first injector is arranged in the center of the top wall of the base and is arranged opposite to the first ejection tube. The periphery of the top wall of the base or the outer wall adjacent to the top wall is radially recessed inward toward the first ejector with at least two recesses, and each second injector corresponds to its own recess and is arranged opposite to its own corresponding second ejection channel.

[0016] To further solve the second technical problem, preferably, the top wall of the base is sunken downward at the central part outside the recess to form a concave cavity, the first injector is arranged on the bottom wall of the concave cavity, and the first ejector tube extends into the concave cavity and is arranged opposite to the first injector. Since the base eliminates the conventional bottom cup under the liquid tray, and makes the base a columnar structure, wherein the central part of the base outside the recess has a concave cavity for the first ejector tube to extend into, the first ejector tube can be made longer without changing the height of the overall burner, 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.

[0017] In order to make the distance between the second injector and the air inlet of the second injection channel relatively close and improve the injection capacity, preferably, the second injector is higher than the first injector.

[0018] Furthermore, the base has a vertical chamber corresponding to the concave cavity, the upper end of the vertical chamber is closed as a blind end, the lower parts of the vertical chambers are interconnected, and the second injector is arranged at the side end of the upper closed end of the vertical chamber. The vertical chamber is a plurality of vertical chambers that are independently arranged relative to the concave cavity and are interconnected at the bottom. With the help of the closed end surface, the phase fluid separation of the first injector and the second injector is effectively achieved, so as to allow the user to individually control the inflow of the fuel mixture into the first ejector tube and the second ejector channel.

[0019] In order to realize the connection between the central connecting plate together with the outer ring mixing chamber and the base, and to achieve the overall stability of the burner and the convenience of installation, preferably, the lower surface of the central connecting plate has a support member extending vertically downward at the periphery of the first ejector tube, and the inner periphery of the peripheral wall of the concave cavity is correspondingly provided with a support platform for supporting the support member.

[0020] To further solve the third technical problem mentioned above, preferably, the outer ring fire cover includes an annular body, the annular body includes an annular top wall and an inner ring wall and an outer ring wall extending vertically or obliquely downward 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, and the annular top wall and / or the inner ring wall of the outer ring fire cover have radial main fire holes distributed at intervals along the circumferential direction. If the annular top wall or the inner ring wall has radial main fire holes, it is beneficial to reduce the situation where the overflow causes the fire hole to be blocked; or if both the annular top wall and the inner ring wall have radial main fire holes, when both the annular top wall and the inner ring wall have radial main fire holes, the length of the radial main fire hole can be set shorter than when it is set on the annular top wall or the inner ring wall alone, and under the condition of the same secondary air supplement amount, both can be exposed to sufficient secondary air to avoid the phenomenon of yellow fire and the like.

[0021] In order to avoid the yellow fire phenomenon and to further solve the fourth technical problem mentioned above, preferably, the annular top wall and the inner annular wall both have radial main fire holes: the annular top wall of the outer annular fire cover is inclined downward from the outside to the inside, and the inner annular wall is inclined downward from the outside to the inside, and the inclination angle α of the annular top wall relative to the horizontal plane and the inclination angle β of the inner annular wall relative to the horizontal plane satisfy α<β, and the annular top wall and the inner annular wall both have radial main fire holes distributed at intervals along the circumferential direction. The inner ring wall with a larger inclination angle β relative to the horizontal plane has less heating between the radial main fire holes, and the upward flame is beneficial to improving thermal efficiency, but the secondary air sucked in only comes from the annular cavity surrounded by the inner ring wall, the suction capacity is weak, and the smoke is high; the annular top wall with a smaller inclination angle α relative to the horizontal plane has better suction capacity in the circumferential direction, but there is a state where the flame part is far away from the pot, and the lower flame is actually burning the upper flame, resulting in low efficiency. In order to improve the uniformity of the outer ring fire cover and the overall flame shape, the annular top wall of a single outer ring fire cover has an inward The radial main fire holes that rotate and / or rotate outward and the inner ring wall that rotate outward and / or rotate inward can make up for the defects of a single radial main fire hole set on the annular top wall or the inner ring wall, so that it can not only well draw in the required secondary air but also have higher thermal efficiency. The reason is that: there are radial main fire holes on both the annular top wall and the inner ring wall, and the radial main fire holes can be made shorter. Therefore, even if the radial main fire holes on the inner ring wall have weaker entrainment capacity, they can still burn fully; and the radial main fire holes on the annular top wall themselves have better entrainment capacity, and the flame of the inner ring wall is close to the pot, which can make up for the limitation that the flame part is far from the pot.

[0022] In order to satisfy the requirement that the burner gas firepower is controlled by valve regulation, the inner rotating fire formed by the radial main fire of the inner ring wall and the outer rotating fire formed by the radial main fire hole of the annular top wall can be used simultaneously, or the inner rotating fire and the outer rotating fire can be used separately, especially in the flames in the inner, central and outer circumferential directions, there is basically no turbulence and interference in the flames, and it also has the function of cooking with a small fire. An annular partition plate is arranged on the bottom wall of the outer ring mixing chamber, and the annular partition plate divides the outer ring mixing chamber into two independent chambers, and each independent chamber is connected to the corresponding second injection channel. The outer ring mixing chamber can be divided into a first outer ring mixing chamber located on the inner side and a second outer ring mixing chamber located on the outer side, and the second injector respectively gives the fuel mixture to the first outer ring mixing chamber and the second outer ring mixing chamber, and the first outer ring mixing chamber and the second outer ring mixing chamber are separated by fluid, so that they can be supplied separately.

[0023] In order to make the second ejection channel longer, the second ejection channel is a radial venturi tube, the air inlet of the second ejection channel is opposite to the second ejector corresponding to each other, and the air outlet of the second ejection channel extends to the bottom wall of the outer ring gas mixing chamber. Of course, the present invention can also completely limit the second ejection channel to the side of the central connecting plate and present a convergent-divergent tubular structure.

[0024] In order to prevent overflow from clogging the air inlet of the second ejection channel, the side of the central connecting plate outside the first ejection pipe forms a waterproof eaves located above the air inlet of the second ejection channel.

[0025] In order to effectively lengthen the length of the first ejector pipe corresponding to the inner ring mixing chamber, the side of the central connecting plate is low and the central position is high. The side of the central connecting plate constitutes a part of the tube wall of the second ejector channel, and an installation groove for installing the inner ring fire cover is recessed downward on the upper surface at the central position.

[0026] In order to avoid the annular cavity formed by the inner ring wall being blocked by the setting of the central connecting plate, so that the secondary air in the annular cavity is insufficient to supplement the radial main fire holes of the inner ring wall, the gap between the central connecting plate and the inner ring wall constitutes an air supply channel connected to the outside world and used to supplement the secondary air to the radial main fire holes of the inner ring wall.

[0027] Compared with the prior art, the advantage of the present invention is that the conventional bottom cup located under the liquid collecting tray is omitted, and the base is partially higher than the circular type above the liquid collecting tray. The second injector is arranged on the periphery of the top wall of the base or the outer wall adjacent to its top wall, which is radially recessed inward toward the first injector with at least two recesses. The relative distance between the second injector and the first injector becomes smaller, so that the relative distance between the second injector and the second injection channel becomes larger. In order to make the distance between the second injector and the air inlet of the second injection channel relatively close, the length of the second injection channel can be lengthened without changing the height of the overall burner. In addition, the second injectors do not interfere with each other, thereby improving the injection capacity of the second injection channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an upper air inlet burner in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0030] Figure 3 A cross-sectional view of an outer ring fire cover in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the outer ring gas mixing chamber in an embodiment of the present invention;

[0032] Figure 5 Figure 4 Schematic diagram of the structure from another angle;

[0033] Figure 6 for Figure 1 A cross-sectional view at an angle;

[0034] Figure 7 for Figure 1 A cross-sectional view from another angle;

[0035] Figure 8 for Figure 1 A cross-sectional view from another angle;

[0036] Fig. 9 It is a structural schematic diagram of a base in an embodiment of the present invention;

[0037] Fig.10 for Fig. 9 sectional view of . DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 10As shown, it is the best embodiment of the present invention. The upper air inlet burner includes a base 1, which contains a mutually independent first injector 2 and at least two second injectors located outside the first injector 2, and an outer ring mixing chamber 4 is arranged on the base 1. The outer ring mixing chamber 4 includes an inner ring wall 41 and an outer ring wall 42 that are annular and concentrically spaced, and a bottom wall 43 connecting the inner ring wall 41 and the outer ring wall 42. The inner ring wall 41 and the outer ring wall 42 are covered with an outer ring fire cover 5, and the inner ring wall 41 is surrounded by an annular cavity 410; The fire cover includes an inner ring fire cover 6 and an outer ring fire cover 5, the outer ring fire cover 5 covers the inner ring wall surface 41 and the outer ring wall surface 42 of the outer ring mixing chamber 4, and also includes a central connecting plate 7 spanning the annular cavity 410, the inner ring fire cover 6 is arranged on the central connecting plate 7, and forms an inner ring mixing chamber 61 with the central connecting plate 7, the central connecting plate 7 has a vertical first ejector pipe 71, the first ejector pipe 71 corresponds to the inner ring mixing chamber 61, and at least two independent second ejector channels are arranged circumferentially and spaced apart along the bottom wall 43 of the outer ring mixing chamber 4, the second ejector pipe 71 is provided with a first ejector pipe 71, and the first ejector pipe 71 is provided with a first ejector pipe 71. The first ejector pipe 71 corresponds to the inner ring mixing chamber 61, and at least two independent second ejector channels are arranged circumferentially and spaced apart along the bottom wall 43 of the outer ring mixing chamber 4. The injection channel has an axis inclined relative to the horizontal plane, and the outer annular gas mixing chamber 4 corresponds to the second injection channel; in order to lengthen the length of the second injection channel without changing the height of the overall burner, the base 1 of this embodiment is cylindrical, and the first injector 2 is arranged at the center of the top wall of the base 1 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 thereof is recessed radially inwardly toward the first injector 2 with at least two recesses 11, and each second injector corresponds to its own recess 11 and is arranged opposite to the corresponding second injection channel Since 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 thereof and is radially recessed inwardly toward the first injector 2 with at least two dimples 11, the relative distance between the second injector and the first injector 2 becomes smaller, so that the relative distance between the second injector and the second injection channel becomes larger. In order to make the distance between the second injector and the air inlet of the second injection channel relatively close, the length of the second injection channel can be lengthened without changing the height of the overall burner. In addition, the second injectors do not interfere with each other, thereby improving the injection capacity of the second injection channel.

[0040] Similarly, in order to make the first ejector tube 71 longer without changing the height of the overall burner, the top wall of the base 1 is recessed downward in the central part outside the recess 11 to form a cavity 12, and the first ejector 2 is arranged on the bottom wall 43 of the cavity 12, and the first ejector tube 71 extends into the cavity 12 and is arranged opposite to the first ejector 2. The central part of the base 1 has a cavity 12 for the first ejector tube 71 to extend into, so that the first ejector tube 71 can be made longer without changing the height of the overall burner, so that the flame of the upper air intake burner is short, uniform and powerful, and there will be no defects such as yellow flame and flashback. In addition, in order to make the distance between the second ejector and the air inlet of the second ejector channel relatively close and improve the ejection capacity, the second ejector is higher than the first ejector 2. The base 1 has a vertical chamber 13 corresponding to the recess 11, the upper end of the vertical chamber 13 is closed as a blind end, the lower parts of each vertical chamber 13 are interconnected, and the second injector is arranged at the side end of the upper closed end of the vertical chamber 13. The vertical chamber 13 is a plurality of vertical chambers 13 that are independently arranged relative to the recess and interconnected at the bottom. With the help of the closed end surface, the phase fluid separation of the first injector 2 and the second injector is effectively achieved, so as to allow the user to individually control the inflow of the fuel mixture into the first ejector pipe 71 and the second ejector channel. In order to realize the connection between the central connecting plate 7 together with the outer ring mixing chamber 4 and the base 1, and to realize the overall stability of the burner and the convenience of installation, the lower surface of the central connecting plate 7 has a support member 9 extending vertically downward on the periphery of the first ejector pipe 71, and the inner periphery of the peripheral wall of the recess 12 is correspondingly provided with a support platform 121 for supporting the support member 9.

[0041] In this embodiment, the outer ring fire cover 5 includes an annular body, which includes an annular top wall 51 and an inner ring wall 52 and an outer ring wall 53 extending vertically or obliquely downward 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 surface 41, and the outer ring wall 53 abuts against the outer ring wall surface 42. The annular top wall 51 and / or the inner ring wall 52 of the outer ring fire cover 5 have 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. If the annular top wall 51 or the inner annular wall 52 has radial main fire holes 50, it is helpful to reduce the blockage of the fire holes by overflow; or if both the annular top wall 51 and the inner annular wall 52 have radial main fire holes 50, when both the annular top wall 51 and the inner annular wall 52 have radial main fire holes 50, the length of the radial main fire holes 50 can be set shorter than when they are set on the annular top wall 51 or the inner annular wall 52 alone. Under the condition of the same secondary air supplement amount, both can be exposed to sufficient secondary air to avoid the yellow fire phenomenon. In order to avoid the yellow fire phenomenon, the annular top wall 51 and the inner annular wall 52 both have radial main fire holes 50 as an example for description:

[0042] The annular top wall 51 of the outer ring fire cover 5 is inclined downward from the outside to the inside, and the inner ring wall 52 is inclined downward from the outside to the inside, and the inclination angle α of the annular top wall 51 relative to the horizontal plane and the inclination angle β of the inner ring wall 52 relative to the horizontal plane satisfy α<β, and the annular top wall 51 and the inner ring wall 52 both have radial main fire holes 50 distributed at intervals along the circumferential direction, and the inner ring wall 52 with a larger inclination angle β relative to the horizontal plane, the radial main fire holes 50 heat each other less, and the upward flame is beneficial to improving thermal efficiency, but the secondary air sucked in only comes from the annular cavity 410 surrounded by the inner ring wall 41, the suction capacity is weak, and the smoke is high; the annular top wall 51 with a smaller inclination angle α relative to the horizontal plane has a better suction capacity in the circumferential direction, but there is a state in which the flame part is far away from the pot, and the flame at the bottom is actually burning near The flame on the outer ring fire cover 5 leads to low efficiency. In order to improve the uniformity of the outer ring fire cover 5 and the overall flame shape, the annular top wall 51 of a single outer ring fire cover 5 has a radial main fire hole 50 that rotates inwardly / or outwardly and the inner ring wall 52 has a radial main fire hole 50 that rotates outwardly / or inwardly, which can make up for the defect of setting a single radial main fire hole 50 on the annular top wall 51 or the inner ring wall 52, so that it can not only well suck the required secondary air but also have high thermal efficiency. The reason is that: there are radial main fire holes 50 on both the annular top wall 51 and the inner ring wall 52, and the radial main fire holes 50 can be made shorter. Therefore, even if the radial main fire holes 50 of the inner ring wall 52 have weaker suction capacity, it can still burn fully; and the radial main fire holes 50 of the annular top wall 51 itself has good suction capacity, and the flame of the inner ring wall 52 is close to the pot, which can make up for the limitation that the flame part is far from the pot.

[0043] In order to satisfy the requirement that the burner gas fire power is controlled by valve regulation, the inner rotary fire formed by the radial main fire holes 50 of the inner ring wall 52 and the outer rotary fire formed by the radial main fire holes 50 of the annular top wall 51 can be used simultaneously, or the inner rotary fire and the outer rotary fire can be used separately, especially in the flames in the inner, central and outer circumferential directions, there is basically no turbulence and interference in the flames, and it also has the function of cooking with a small fire. An annular partition plate 431 is provided on the bottom wall 43 of the outer ring mixing chamber 4, which divides the outer ring mixing chamber 4 into two independent chambers, each of which is connected to its corresponding second injection channel, and the outer ring mixing chamber 4 can be divided into a first outer ring mixing chamber 44 located on the inner side and a second outer ring mixing chamber 45 located on the outer side, and the second injector respectively gives the fuel mixture to the first outer ring mixing chamber 44 and the second outer ring mixing chamber 45, and the first outer ring mixing chamber 44 and the second outer ring mixing chamber 45 are fluid-separated, so that they can be supplied separately. This embodiment takes four second injectors as an example. For example, in a burner with two Venturi cavities, in order to obtain 4kW, each individual Venturi cavity must be loaded with 2kW; in the case of a burner with four Venturi cavities, reducing the load of each Venturi cavity to 1.25kW, minus 62.5%, the maximum power can be obtained as 5kW; for this reason, correspondingly, there are also four second ejection channels, including a second ejection channel 1 81, a second ejection channel 2 82, a second ejection channel 3 83, and a second ejection channel 4 84. The second ejection channel 1 81 and the second ejection channel 2 82 are connected to the first outer ring mixing chamber 44, and the second ejection channel 3 83 and the second ejection channel 4 84 are connected to the second outer ring mixing chamber 45. Among them, the second injection channel 1 81, the second injection channel 2 82, the second injection channel 3 83, and the second injection channel 4 84 are all radial Venturi tubes, and the air inlet of each second injection channel is opposite to the corresponding second injector. The second injectors include a second injector 1 31 corresponding to the second injection channel 1 81, a second injector 2 32 corresponding to the second injection channel 2 82, a second injector 3 33 corresponding to the second injection channel 3 83, and a second injector 4 34 corresponding to the second injection channel 4 84. The air outlets of the second injection channel 1 81 and the second injection channel 2 82 extend to the bottom wall 43 of the first outer ring mixing chamber 44 and are connected to the first outer ring mixing chamber 44. The air outlets of the second injection channel 3 83 and the second injection channel 4 84 extend to the bottom wall 43 of the second outer ring mixing chamber 45 and are connected to the second outer ring mixing chamber 45.Among them, the side portion 74 of the central connecting plate 7 outside the first ejection pipe 71 constitutes a waterproof eave located above the air inlet of each second ejection channel to prevent overflow from clogging the air inlet of the second ejection channel. In order to effectively lengthen the length of the first ejection pipe 71 corresponding to the inner ring mixing chamber 61, the side portion of the central connecting plate 7 is low and the central position is high. The side portion of the central connecting plate 7 constitutes a part of the pipe wall of the second ejection channel, and a mounting groove 73 for mounting the inner ring fire cover 6 is recessed downward on the upper surface at the central position. Finally, in order to avoid blocking the annular cavity 410 surrounded by the inner ring wall 41 due to the setting of the central connecting plate 7, so that the secondary air in the annular cavity 410 is insufficient to supplement the radial main fire hole 50 of the inner ring wall 52, the gap between the central connecting plate 7 and the inner ring wall 41 constitutes an air supply channel that is connected to the outside and is used to supplement the radial main fire hole 50 of the inner ring wall 52 with secondary air.

[0044] refer to Figure 7 and Figure 8 As mentioned above, the paths of the primary air, gas and the mixed primary air and gas inside the burner (reference dotted line direction) are as follows: due to the low pressure caused by the gas injection from the first injector 2, the first ejector pipe 71 and the inner ring mixing chamber 61, the primary air is sucked into the concave cavity 12 of the base 1 from the outside by the kinetic energy of the gas itself, and the primary air and gas are premixed and finally enter the inner ring mixing chamber 61. The mixed primary air and 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 to form an inner ring fire. The fire cover also includes an inner rotating fire and an outer rotating fire that can be controlled separately by the user. The primary air and gas required for the inner rotating fire are input into the first outer ring mixing chamber 44 by the second injection channel 1 81 and the second injection channel 2 82 independently of the first injection pipe 71. The primary air and gas required for the outer rotating fire are input into the second outer ring mixing chamber 45 by the second injection channel 3 83 and the second injection channel 4 84 independently of the first injection pipe 71. At the same time, the first outer ring mixing chamber 44 and the second outer ring mixing chamber 45 are separated from the inner ring mixing chamber 61. In this way, the fluid separation of the first outer ring mixing chamber 44, the second outer ring mixing chamber 45 and the inner ring mixing chamber 61 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 ejector pipe 71 and the second ejector channel one 81, the second ejector channel two 82, the second ejector channel three 83 and the second ejector channel four 84. If the size of the inner and outer swirling fires is to be adjusted, it is sufficient to adjust the regulating valves connected to the intake pipes arranged on the periphery of the base 1 and connected to the vertical chamber 13.

Claims

1. An upward air inlet burner, comprising: A base (1), wherein the base (1) contains a mutually independent first injector (2) and at least two second injectors located outside the first injector (2); The fire cover comprises an inner ring fire cover (6) and an outer ring fire cover (5); The outer ring gas mixing chamber (4) is arranged on the base (1), and includes an inner ring wall surface (41) and an outer ring wall surface (42) which are arranged concentrically and spaced apart in a ring shape, and a bottom wall (43) connecting the inner ring wall surface (41) and the outer ring wall surface (42), wherein the inner ring wall surface (41) forms an annular cavity (410), and the outer ring fire cover (5) covers the inner ring wall surface (41) and the outer ring wall surface (42), and is characterized in that: It also includes a central connecting plate (7) spanning 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) has a vertical first ejector pipe (71), and the first ejector pipe (71) corresponds to the inner ring gas mixing chamber (61); The bottom wall (43) is provided with at least two independent second ejection channels at intervals along the circumferential direction, the second ejection channels have axes inclined relative to the horizontal plane, and the outer annular gas mixing chamber (4) corresponds to the second ejection channels; The base (1) is columnar, a first injector (2) is arranged at the center of the top wall of the base (1) and is arranged opposite to the first ejection tube (71), at least two recesses (11) are recessed radially inward toward the first injector (2) on the periphery of the top wall of the base (1) or on the outer wall adjacent to the top wall, each second injector corresponds to its own recess (11) and is arranged opposite to its own corresponding second ejection channel.

2. The upward air inlet burner according to claim 1, characterized in that: The top wall of the base (1) is recessed downward at the central portion outside the recess (11) to form a cavity (12); the first injector (2) is arranged on the bottom wall of the cavity (12); the first ejector tube (71) extends into the cavity (12) and is arranged opposite to the first injector (2).

3. The upward air inlet burner according to claim 2, characterized in that: The second injectors are higher than the first injectors (2).

4. The upward air inlet burner according to claim 2, characterized in that: The base (1) has a vertical chamber (13) corresponding to the recess (11), the upper end of the vertical chamber (13) is closed as a blind end, the lower parts of the vertical chambers (13) are interconnected, and the second injector is arranged at the side end of the upper closed end of the vertical chamber (13).

5. The upward air inlet burner according to claim 4, characterized in that: The lower surface of the central connecting plate (7) has a support member (9) extending vertically downward at the periphery of the first ejector tube (71), and a support platform (121) for supporting the support member (9) is correspondingly provided at the inner periphery of the peripheral wall of the concave cavity (12).

6. The upward air inlet burner according to any one of claims 1 to 5, characterized in that: The outer ring fire cover (5) includes an annular body, which includes an annular top wall (51) and an inner ring wall (52) and an outer ring wall (53) extending vertically or obliquely downward 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 surface (41), and the outer ring wall (53) abuts against the outer ring wall surface (42), and the annular top wall (51) and / or the inner ring wall (52) of the outer ring fire cover (5) have radial main fire holes (50) distributed at intervals along the circumferential direction.

7. The upward air inlet burner according to claim 6, characterized in that: The annular top wall (51) of the outer ring fire cover (5) is inclined downward from the outside to the inside, and the inner ring wall (52) is inclined downward from the outside to the inside, and the inclination angle α of the annular top wall (51) relative to the horizontal plane and the inclination angle β of the inner ring wall (52) relative to the horizontal plane satisfy α<β, and the annular top wall (51) and the inner ring wall (52) both have radial main fire holes (50) distributed at intervals along the circumferential direction.

8. The upward air inlet burner according to claim 7, characterized in that: An annular partition plate (431) is provided on the bottom wall (43) of the outer annular gas mixing chamber (4), and the annular partition plate (431) divides the outer annular gas mixing chamber (4) into two independent chambers, each of which is connected to the corresponding second ejection channel.

9. The upward air inlet burner according to claim 8, characterized in that: The second ejection channel is a radial venturi tube, the air inlet of the second ejection channel is opposite to the second ejector corresponding to each other, and the air outlet of the second ejection channel extends to the bottom wall (43) of the outer annular gas mixing chamber (4).

10. The upward air inlet burner according to claim 9, characterized in that: The side of the central connecting plate (7) outside the first ejection pipe (71) forms a waterproof eave located above the air inlet of the second ejection channel.

11. The upward air inlet burner according to claim 9, characterized in that: The side of the central connecting plate (7) is low and the central position is high. The side (74) of the central connecting plate (7) constitutes a part of the tube wall of the second ejection channel, and a mounting groove (73) for mounting the inner ring fire cover (6) is recessed downward on the upper surface at the central position.

12. The upward air inlet burner according to any one of claims 6 to 11, characterized in that: The space between the central connecting plate (7) and the inner ring wall surface (41) forms an air supply channel that is connected to the outside and is used to supply secondary air to the radial main fire holes (50) of the inner ring wall (52).

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