High-power direct injection burner

Abstract

The invention belongs to the technical field of gas stoves, and particularly relates to a high-power direct injection type burner. Comprising a central ejector and a central fire cover, the central ejector is provided with a central ejector pipe, the central ejector pipe comprises a first air suction contraction part, a first throat part, a first diffusion part and a conical part arranged at an outlet of the first diffusion part, a first nozzle is installed at the lower end of the central ejector pipe, and a first air inlet is further formed in the lower end of the central ejector; the center fire cover covers the upper end of the center injection pipe, the center injection pipe, the first nozzle and the center fire cover are coaxially arranged, a plurality of fire holes are formed in the top face of the center fire cover and are obliquely arranged relative to the axis, and the side wall of the center fire cover is closed. Or the other areas of the side wall of the central fire cover except for the gas outlet structure matched with ignition or flameout prevention are all closed. The invention has the advantages of large gas output, high combustion power, high heat efficiency, safe and stable combustion, sufficient combustion and no excessive smoke.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas stoves, and particularly relates to a high-power direct injection burner. Background Art

[0002] A gas stove, also known as a gas cooker, stove top, cooking range, or cooking appliance, refers to a kitchen appliance that uses gaseous fuels such as liquefied petroleum gas (liquid), manufactured gas, and natural gas for direct flame heating. Among them, a high-power gas stove has a larger gas supply volume, a larger overall combustion power of the burner head, a greater combustion intensity, and can usually quickly heat food ingredients to improve cooking efficiency.

[0003] Patent document [2013200020877] discloses a direct injection gas burner, which includes a burner head and a burner cap. The burner head includes a hollow frustoconical base and an air outlet pipe located at the top. There is a jet pipe bracket inside the frustoconical base. The burner cap is buckled on the top of the air outlet pipe. A mixing chamber is provided at the top of the air outlet pipe. The burner cap covers the mixing chamber. The burner cap includes a top cover plate and an interface. Combustion holes are located on the top cover plate. The interface is inserted into the upper opening of the mixing chamber. The axis of the combustion hole is perpendicular to the top cover plate. The top cover plate is spherical crown-shaped. There is an angle between the axis of the combustion hole and the radial line at the combustion hole. The technical problem to be solved by this patent is that the gas and air are not fully mixed, and the gas burns incompletely.

[0004] It can be seen from the drawings that the cross-sectional profile of the frustoconical base is a straight line, and the inhalation of air is subject to certain resistance, resulting in a slow air flow rate. The air outlet pipe is pressurized and released into the mixing chamber from the air outlet pipe. The diameter of the mixing chamber is larger than that of the air outlet pipe. The mixing chamber is a straight pipe with a uniform width, which is conducive to uniform mixing, but the resistance loss is large. The side wall of the burner cap is closed to ensure uniform mixing and prevent gas from leaking out from the side wall during the mixing process. The uniformly mixed air flow flows out from the combustion holes on the burner cap. The inclination of the combustion holes is for dispersed combustion to expand the combustion range. The combustion holes are relatively dense. Although this gas burner adopts direct injection, the entrainment of gas is weak, the gas outlet speed is slow, the gas outlet volume is small, it cannot achieve high-power combustion, the combustion temperature is low, and it is not easy to have the problem of flashback.

[0005] Patent document [2019107827319] discloses a porous direct-injection high-speed heating burner, which includes an ejector tube, a base, an upper cover, a central burner cap and an outer ring burner cap. The ejector tube includes a central ejector tube and an outer ring ejector tube. The central ejector tube is connected to the central burner cap through a central gas pipe; the central burner cap is provided with an internal cavity, and the internal cavity is connected to the central gas pipe. The upper surface of the central burner cap is provided with a number of central flame holes, and the openings of the central flame holes face upward. The side wall of the central burner cap is not closed, and a number of air guiding holes are provided on the side wall of the central burner cap. The air guiding holes are connected to the internal cavity, and the air guiding holes can introduce secondary air to make the gas fully mixed in the combustion chamber. The ejector tube of this patent is a bent tube. After the mixed gas flows along the ejector tube first and then deflects, the resistance loss is large, the speed of the gas decreases, the outlet speed is slow, the outlet volume is small, the overall combustion power is not high enough, the combustion temperature is low, the flame propagation speed is slow, and it is not easy to have the problem of flashback.

[0006] Patent document [CN2020222228444] discloses a burner and a kitchen appliance. The burner includes a double ejector tube, an inner ring burner head and an outer ring burner head. The double ejector tube includes a tube body and a connecting piece. The tube body forms a first ejector channel and a second ejector channel. The connecting piece is connected to the tube body. The double ejector tube is fixed on the panel. The inner ring burner head communicates with the first ejector channel, and the outer ring burner head communicates with the second ejector channel. When the first ejector channel is used alone to supply gas to the inner ring burner head, the ejecting amount of the gas in the first ejector channel is more sufficient, increasing the power of the inner ring burner head. When the second ejector channel is used alone to supply gas to the outer ring burner head, the ejecting amount of the gas in the second ejector channel is more sufficient, increasing the power of the outer ring burner head, so that the burner can achieve high-power combustion and can be applied to more working environments.

[0007] For high-power gas stoves, due to their large gas supply, large overall combustion power of the burner head, high combustion intensity, high combustion temperature and fast flame propagation speed, it is very easy to have the phenomenon of flashback, that is, the flame propagation speed is greater than the gas flow speed. The flame not only burns above the burner cap, but also burns inside the burner cap, and the burner cap will be burned red and is extremely easy to be damaged. Therefore, the flame holes of high-power gas stoves are all arranged on the outer peripheral wall of the burner cap. For example, in the above patent, the flame holes are arranged on the outer peripheral wall of the inner ring burner head, and a flame stabilizing groove and flame stabilizing holes communicating with the flame stabilizing groove are also provided on the inner ring burner head.

[0008] The flame holes are all arranged on the side wall of the burner cap. The ejected flame tends to be horizontal and burns downward during combustion. The propagation of the flame is blocked, so the problem of flashback is not likely to occur. Moreover, the ejected flame tends to be horizontal, and the flame can come into sufficient contact with the secondary air, resulting in a low carbon monoxide content in the flue gas. In addition, a flame stabilizing groove and flame stabilizing holes communicating with the flame stabilizing groove are provided on the side wall of the inner ring burner head. The flame stabilizing holes communicate with the inner cavity of the inner ring burner head. The diameter of the flame stabilizing holes is smaller than that of the flame holes. When the flame propagation speed is faster than the gas flow speed, the resistance of the flame stabilizing holes is greater than that of the flame holes, and flashback will not occur, and combustion will always occur. When the flame at the flame hole is blown out by the gas after flashback, the flame at the flame stabilizing holes can promptly ignite the root of the main flame. When the flame propagation speed is slower than the gas flow speed, the gas output of the flame stabilizing holes is small, and blow-off will not occur, and combustion will always occur, heating the root of the main flame and improving the ability of the root of the main flame to prevent blow-off at high temperature. Therefore, the burner realizes the safe and stable combustion of the flame through the arrangement of the flame holes on the side wall of the burner cap and the design of the flame stabilizing groove and the flame stabilizing holes.

[0009] However, since the flame holes are arranged on the side wall, the gas rushes straight up, and the gas flow needs to deflect first and then flow out from the flame holes on the side wall, resulting in some energy loss. The speed of the gas leaving the flame holes, that is, the outlet speed of the flame holes, decreases. The overall gas supply is small. Generally, the number of rows of flame holes that can be arranged on the side wall is two rows, and the overall number of flame holes is limited. The gas output is not high enough to achieve a higher combustion intensity, the overall combustion power is not large enough, and the thermal efficiency is low. Summary of the Invention

[0010] The object of the present invention is to provide a high-power direct-injection burner with a large gas output, high combustion power, high thermal efficiency, capable of safe and stable combustion, full combustion, and no excessive flue gas, aiming at the above problems.

[0011] To achieve the above object, the present invention adopts the following technical solutions: This high-power direct-injection burner is characterized in that it includes a central injector and a central burner cap. The central injector has a central injection pipe, and the central injection pipe includes a suction contraction part one, a throat part one, a diffuser part one, and a cone part arranged at the outlet of the diffuser part one. A nozzle one is installed at the lower end of the central injection pipe, and an air inlet one is also opened at the lower end of the central injector. The central burner cap covers the upper end of the central injection pipe. The central injection pipe, the nozzle one, and the central burner cap are coaxially arranged. A plurality of flame holes are opened on the top surface of the central burner cap, and the flame holes are inclined relative to the axis. The side wall of the central burner cap is closed, or the side wall of the central burner cap is closed in the remaining areas except for the gas outlet structure for ignition or flameout prevention.

[0012] In the above high-power direct-injection burner, the diameter of the flame holes is 2.0 - 2.6 mm, the angle between the flame holes and the central axis is 10 - 18 degrees, and the depth of the flame holes is 4 - 6 mm.

[0013] In the above-mentioned high-power direct-injection burner, the diameter of the flame holes is 2.3 mm, the angle between the flame holes and the central axis is 15 degrees, and the depth of the flame holes is 6 mm.

[0014] In the above-mentioned high-power direct-injection burner, outer flame holes are provided at the periphery of the top surface of the central flame cover.

[0015] In the above-mentioned high-power direct-injection burner, the diameter of the outer flame holes is 2.3 - 2.6 mm, and the angle between the outer flame holes and the central axis is 60 degrees.

[0016] In the above-mentioned high-power direct-injection burner, the diameter of the outer flame holes is 2.5 mm.

[0017] In the above-mentioned high-power direct-injection burner, a groove is further provided on the top surface of the central flame cover, and the groove extends from the center to the edge and opens at the edge to form a notch.

[0018] In the above-mentioned high-power direct-injection burner, a flow guiding protrusion is provided at the center position of the inner top wall of the central flame cover, and the flow guiding protrusion has a flow guiding outer peripheral surface.

[0019] In the above-mentioned high-power direct-injection burner, the air holes of the first nozzle are located outside the central injection tube.

[0020] In the above-mentioned high-power direct-injection burner, the cross-sectional area of any one head of the central flame cover is 2 - 4 times the total area of the flame holes, and the height of the air chamber of the central flame cover is 5 - 10 mm.

[0021] In the above-mentioned high-power direct-injection burner, the inner cavity of the central flame cover is cylindrical, the cross-sectional area of the head is 3.2 - 3.5 times the total area of the flame holes, and the height of the air chamber of the central flame cover is 7 mm.

[0022] In the above-mentioned high-power direct-injection burner, the inlet diameter of the first suction contraction part is 46.6 - 50.6 mm, the curvature radius of the first suction contraction part is 25.7 - 29.7 mm, the height of the first suction contraction part is 26 - 30 mm, the diameter of the first throat is 12 - 14 mm, the diameter of the first nozzle is 0.7 - 1.2 mm, the distance between the first nozzle and the first throat is 22 - 24 mm, the divergence angle of the first diffuser part is 6 - 8 degrees, the height of the first diffuser part is 47 - 51 mm, the divergence angle of the cone part is 50 - 80 degrees, and the height of the cone part is 8 - 12 mm.

[0023] In the above-mentioned high-power direct injection burner, the inlet diameter of the intake contraction portion 1 is 48.64mm, the curvature radius of the intake contraction portion 1 is 27.76mm, the height of the intake contraction portion 1 is 28mm, the diameter of the throat 1 is 13mm, the distance between the nozzle 1 and the throat 1 is 23mm, the opening angle of the diffuser portion 1 is 6 degrees, the height of the diffuser portion 1 is 49mm, the opening angle of the cone portion is 66 degrees, and the height of the cone portion is 10mm.

[0024] In the above-mentioned high-power direct-injection burner, the ignition outlet structure includes an ignition groove and / or an outlet hole. The anti-flameout outlet structure includes an ignition groove and / or an outlet hole. Both the ignition groove and the ignition groove extend toward the middle of the top surface of the center fire cover.

[0025] Compared with the existing technology, the advantages of this high-power direct injection burner are:

[0026] First, direct gas injection, the mixed gas rushes out directly from the fire hole along the airflow direction without deflection, the resistance loss is small, the air flow speed at the fire hole outlet is fast, the overall gas output is increased, and the number of fire holes that can be set on the top surface is more than the number of fire holes that can be set on the traditional side wall. The overall number of fire holes is large, the total area of ​​the fire holes is large, the gas output is further increased, the overall combustion intensity is greatly enhanced, the overall combustion power is large, and the thermal efficiency is high.

[0027] Second, the central ejector tube includes an air intake contraction portion, a throat portion, a pressure diffuser portion and a cone portion arranged at the outlet of the pressure diffuser portion. The ejection force of the central ejector tube is strong, the gas drives the air flow rate to be faster, the central ejector tube is shorter, and the mixed airflow flows directly to the central fire cover and is ejected directly into the central fire cover without any obstruction in the middle. The direction of the airflow does not change during the flow and ejection process, the resistance loss is small, and the dynamic pressure is converted into static pressure as much as possible. The greater the static pressure, the faster the fire hole exit speed, that is, the faster the airflow speed; the side wall of the central fire cover is closed, the flame stabilizing hole is cancelled, and the air cannot enter the interior of the central fire cover through the flame stabilizing hole; the above-mentioned characteristics are in a synergistic relationship of interaction and close cooperation, which together realize the safe and stable combustion of the flame.

[0028] Thirdly, the center ejector tube can eject more air and mix it evenly with the gas. The primary air coefficient is large. A groove is also provided on the top surface of the center fire cover. The air enters the center position of the center fire cover through the groove, providing sufficient secondary air supply for the center position. The above features interact and cooperate closely to make the gas burn fully, greatly improve the combustion efficiency, do not produce yellow flames, and will not exceed the smoke standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a stereoscopic diagram of a high-power direct-injection burner provided by the present invention.

[0030] Figure 2It is an exploded view of the high-power direct-injection burner provided by the present invention.

[0031] Figure 3 It is a top view of the high-power direct-injection burner provided by the present invention.

[0032] Figure 4 It is provided by the present invention Figure 3 A cross-sectional view along line AA.

[0033] Figure 5 It is a three-dimensional view of the central burner cap provided by the present invention.

[0034] Figure 6 It is a top view of the central burner cap provided by the present invention.

[0035] Figure 7 It is a cross-sectional view of the central burner cap provided by the present invention.

[0036] Figure 8 It is a sectional three-dimensional view of the central burner cap provided by the present invention.

[0037] Figure 9 It is a cross-sectional view of the central injection pipe and the outer ring injection pipe provided by the present invention.

[0038] Figure 10 It is a three-dimensional view of the central injector and the outer ring injector provided by the present invention.

[0039] In the figure, there are central burner cap 1, outer ring burner cap 2, central injector 3, outer ring injector 4, top surface 5, fire holes 6, outer fire holes 8, grooves 9, notch 10, air chamber 11, central injection pipe 12, nozzle 13, air inlet 14, suction contraction part 15, throat 16, diffuser part 17, conical part 18, guide protrusion 19, guide outer peripheral surface 20, outer ring injection pipe 21, nozzle 22, air inlet 23, suction contraction part 24, throat 25, diffuser part 26, clamping structure 1 27, clamping structure 2 28, ignition groove 1 29, ignition groove 2 30, positioning convex ring 31, positioning ring groove 32. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment

[0042] As Figures 1-10As shown in the figure, this high-power direct-injection burner includes a central injector 3 and a central burner cap 1. The central injector 3 has a central injection pipe 12. The central injection pipe 12 includes a suction contraction part 15, a throat part 16, a diffuser part 17, and a cone part 18 provided at the outlet of the diffuser part 17. A nozzle 13 is installed at the lower end of the central injection pipe 12. An air inlet 14 is also provided at the lower end of the central injector 3. The central burner cap 1 covers the upper end of the central injection pipe 12. The central injection pipe 12, the nozzle 13, and the central burner cap 1 are coaxially arranged. A plurality of flame holes 6 are provided on the top surface 5 of the central burner cap 1. The flame holes 6 are inclined relative to the axis. The side wall of the central burner cap 1 is closed, or the side wall of the central burner cap 1 is closed in all areas except the gas outlet structure for ignition or flameout prevention.

[0043] The gas and the primary air are mixed in the central injector 3 and ejected through the flame holes 6. The flame holes 6 are provided on the top surface 5 of the central burner cap 1. The mixed gas directly rushes out of the flame holes 6 along the air flow direction without deflection, with small resistance loss. The speed of the gas leaving the flame holes is faster than that of the traditional flame holes opened on the side wall, that is, the outlet speed of the flame holes is fast, the overall gas output increases, and the number of rows of flame holes 6 that can be provided on the top surface 5 is more than the number of rows of flame holes that can be provided on the traditional side wall. The overall number of flame holes 6 is large, the total area of the flame holes is large, and the gas output is further increased. Outer flame holes 8 are provided outside the central burner cap 1. The diameter of the outer flame holes 8 is larger than that of the flame holes 6, further increasing the gas output. The inclination angle of the flame holes is large, so that the flame can be evenly dispersed to the bottom of the cookware, the overall combustion intensity is greatly enhanced, the heat load is high, the overall combustion power is large, and the thermal efficiency is high.

[0044] This high-power direct-injection burner solves the problems of easy flashback and inability to burn safely and stably during direct injection of high-power burners through the design of the central burner cap 1 and the central injector 3.

[0045] The central injection tube 12 includes an air intake contraction part 15, a throat part 16 and a diffuser part 17. A conical part 18 is also provided at the outlet of the diffuser part 17. The fuel gas is ejected rapidly from the nozzle 13. The air intake contraction part 15 generates a negative pressure, and air is rapidly sucked in and flows rapidly. The flow rates of both the air and the fuel gas are relatively fast. After passing through the throat part 16, in the diffuser part 17, the dynamic pressure is converted into static pressure to increase the pressure of the gas, and the air and the fuel gas are further mixed, that is, the mixing and diffusion of the air and the fuel gas are carried out simultaneously. In addition, the overall length of the central injection tube 12 is reduced, and the resistance loss during the flow process is reduced. The mixed fuel gas flowing out of the diffuser part 17 has a high speed. The opening angle of the conical part 18 is larger than that of the diffuser part 17, the speed of the mixed fuel gas decreases, and the static pressure of the air flow increases rapidly, so that the dynamic pressure is converted into static pressure. When the air flow reaches the central burner cap, the air flow is evenly distributed on each fire hole. Generally speaking, the central injection tube 12 has a strong injection force, the fuel gas drives the air to flow relatively fast, the central injection tube 12 is relatively short, the mixed air flow directly flows towards the central burner cap 1 and sprays out straight through the central burner cap 1 without any obstruction in the middle, and the air flow direction does not change during the flowing and spraying processes, the resistance loss is small, and the dynamic pressure is converted into static pressure as much as possible. The greater the static pressure, the faster the outlet speed of the fire hole, that is, the faster the air flow speed. Theoretically speaking, the air flow speed is fast enough to balance the flame propagation speed, so that the ignition ring is stabilized on the central burner cap 1 and there will be no flashback, that is, there will be no combustion inside the central burner cap 1.

[0046] However, during the experiment, the flame of the central burner cap 1 with flame stabilizing holes burns unstably. In the initial state, the flame flickers and then lifts off. This lifted-off flame is a yellow flame and is prone to generating flue gas. The reason is that after the gas output increases, the combustion power is greater, and air enters the inside of the central burner cap 1 through the flame stabilizing holes, the temperature drops suddenly, and the combustion reaction suddenly interrupts. As is well known, the flame stabilizing holes are used to stabilize the flame. The applicant overcomes the technical prejudice, cancels the flame stabilizing holes, and closes the side wall of the central burner cap 1. After canceling the flame stabilizing holes, air cannot enter the inside of the central burner cap 1 through the flame stabilizing holes, the flame is blue and burns stably above the central burner cap 1. The central burner cap 1 will not be burned red, has a long service life and does not need to be replaced frequently. The static pressure inside the central burner cap 1 is greater and the gas outlet speed is faster.

[0047] The above features have a synergistic relationship of interacting with each other and cooperating closely. None of them can be missing, and they work together to achieve the purpose that the high-power burner does not flash back during combustion and the flame can burn safely and stably.

[0048] The fire holes 6 are arranged obliquely with respect to the axis and have an inclination angle, which has a certain degree of blockage to the flame propagation and also slows down the flame propagation speed. The inclination of the fire hole angles enables the flame to be evenly dispersed to the bottom of the cookware, avoiding the problem of concentrated firepower of the central direct-injection cooktop.

[0049] Furthermore, on the central burner cap 1, the diameter of the flame holes 6 is 2.0 - 2.6 mm, preferably 2.3 mm, the angle between the flame holes 6 and the central axis is 10 - 18 degrees, preferably 15 degrees, and the depth of the flame holes 6 is 4 - 6 mm, preferably 6 mm. By reducing the diameter of the flame holes 6, the heat of the flame is absorbed by the inner wall of the flame holes 6, reducing the flame propagation speed. With the increased depth of the flame holes 6, the time for the flame to pass through the flame holes 6 is prolonged, more heat of the flame is absorbed, and the flame propagation speed is further reduced. The inclination angle and depth of the flame holes 6 do not affect the direct injection of the air flow, with little energy loss and less impact on the air flow speed. Therefore, the flame propagation speed is reduced from the diameter, depth, and inclination angle of the flame holes 6 to further avoid flashback.

[0050] The diameter of the outer flame holes 8 is 2.3 - 2.6 mm, preferably 2.5 mm, and the angle between the flame holes 6 and the central axis is 60 degrees. The air output of the outer flame holes 8 is greater than that of the flame holes 6, further enhancing the combustion intensity, increasing the combustion power, being able to ignite the flame holes 6 in time, and maintaining the flame stability.

[0051] In addition, high-power gas stoves consume a large amount of oxygen. If the oxygen supply is insufficient, the gas compound undergoes thermal decomposition, dehydrogenation and carbon accumulation occur, producing a considerable amount of solid carbon particles. When these carbon particles burn, they present a bright yellow flame. Incomplete combustion of the gas will produce products such as carbon monoxide. If the carbon monoxide content in the flue gas is too high, it will cause the flue gas to exceed the standard. The high-power direct injection burner solves the problems of large oxygen demand and flue gas exceeding the standard of high-power burners through the design of the central burner cap 1 and the central injector 3.

[0052] A groove 9 is also provided on the top surface 5 of the central burner cap 1. The groove 9 extends from the center to the edge and opens at the edge to form a notch 10. Air enters the central position of the central burner cap 1 through the groove 9, providing sufficient secondary air supply for the central position. The gas burns fully, greatly improving the combustion efficiency without producing a yellow flame and without the flue gas exceeding the standard. Moreover, the oil stains on the bottom of the pot drip onto the center of the groove 9, then flow along the groove 9 to the edge of the central burner cap 1, and finally flow out from the notch 10, thus solving the problem of the nozzle 13 being blocked by the oil stains on the bottom of the pot.

[0053] The central injection tube 12 has two functions. Besides converting the dynamic pressure into static pressure as much as possible to increase the air flow velocity, it can also inject more air to flow in and mix evenly with the gas. The primary air coefficient is large, which is conducive to complete combustion. Specifically, the air holes of nozzle 13 are located outside the central injection tube 12. When the gas is ejected, the air enters nozzle 13 from the air holes and mixes with the gas for the first time, expanding the inlet of the first air suction and contraction part 15, so that as much primary air as possible is introduced, and the curvature radius of the first air suction and contraction part 15 is reduced, increasing the bending degree of the first air suction and contraction part 15. A negative pressure is generated in the first air suction and contraction part 15, and the air is quickly sucked in and flows rapidly. The air flow velocity is fast, and it mixes with the gas again, resulting in a better mixing effect of air and gas. The diameter of the first throat part 16 is increased, so that more gas and air flow into the first diffuser part 17. The divergence angle of the first diffuser part 17 is small, and the gas and air are mixed sufficiently. Generally speaking, from the two aspects of increasing the air intake and the full mixing of air and gas, the primary air coefficient is increased, greatly improving the combustion efficiency without generating yellow flames or exceeding the flue gas standard.

[0054] The layout of the flame holes 6: The flame holes 6 are arranged in 3 rows. From the inside to the outside, the number of the first row of flame holes 6 is 9, the number of the second row of flame holes 6 is 19, and the number of the third row of flame holes 6 is 20. The flame hole spacing is 2 - 3 times the diameter of the flame hole, preferably 6 mm. The flame holes are staggered. The number of flame hole rows is small and the flame hole spacing is large, so that the contact area between the flame and the air is large, which is conducive to the supply of secondary air. The flame holes 6 are inclined, and the inclination angle is preferably 15 degrees, which is conducive to the full contact between the flame and the secondary air and conducive to the complete combustion of the gas.

[0055] A flow guiding protrusion 19 is provided at the center position of the inner top wall of the central burner cap 1. The flow guiding protrusion 19 has a flow guiding outer peripheral surface 20. The flow guiding outer peripheral surface 20 on the flow guiding protrusion 19 is inclined and has a flow guiding effect on the air flow, guiding the air flow to the surrounding. The inner cavity of the central burner cap 1 is cylindrical, and the cross-sectional area of the head is 2 - 4 times the total area of the flame holes, preferably 3.2 - 3.5 times. The large cross-sectional area of the head is conducive to the uniform distribution of the air flow to each flame hole 6, ensuring that the flame heights of each flame hole 6 are the same and enabling the bottom of the pot to be heated evenly. The air chamber 11 of the central burner cap 1 refers to the space between the outlet end of the conical part and the inner top surface of the central burner cap 1. The height of the air chamber 11 is 5 - 10 mm, preferably 7 mm. The height of the air chamber 11 is 5 - 10 mm, and the height of the air chamber 11 is short, and the volume of the head is small, so that the static pressure is large, and a large amount of air will not accumulate at the head during ignition, nor will a large amount of gas - air mixture accumulate at the head during extinguishing. Therefore, no backfire noise will be generated during ignition and extinguishing.

[0056] The specific dimensions of the central injection tube 12 are as follows: The inlet diameter of the first suction contraction part 15 is 46.6 - 50.6 mm, preferably 48.64 mm; the curvature radius of the first suction contraction part 15 is 25.7 - 29.7 mm, preferably 27.76 mm; the height of the first suction contraction part 15 is 26 - 30 mm, preferably 28 mm; the diameter of the first throat part 16 is 12 - 14 mm, preferably 13 mm; the distance between the first nozzle 13 and the first throat part 16 is 22 - 24 mm, preferably 23 mm; the divergence angle of the first diffuser part 17 is 6 - 8 degrees, preferably 6 degrees; the height of the first diffuser part 17 is 47 - 51 mm, preferably 49 mm; the divergence angle of the conical part 18 is 50 - 80 degrees, preferably 66 degrees; the height of the conical part 18 is 8 - 12 mm, preferably 10 mm. The diameter of the first nozzle 13 is 0.7 - 1.2 mm. When using liquefied gas, the first nozzle 13 is preferably 0.75 mm with an air hole of 5 mm; when using natural gas, the first nozzle 13 is preferably 1.15 mm with an air hole of 3 mm. With the above dimensions, the central injection tube 12 has strong injection force, fast air flow speed, uniform gas mixing, and a large primary air coefficient.

[0057] This high-power direct-injection burner further includes an outer ring flame cover 2. The outer ring flame cover 2 covers the outer ring injector 4. The outer ring injector 4 includes an outer ring injection tube 21. A second nozzle 22 is installed at the lower end of the outer ring injection tube 21. The outer ring injection tube 21 and the second nozzle 22 are coaxially arranged. An air inlet 23 is further provided at the lower end of the outer ring injection tube 21. The outer ring injection tube 21 includes a second suction contraction part 24, a second throat part 25, and a second diffuser part 26. The inlet diameter of the second suction contraction part 24 is 46.6 - 50.6 mm, preferably 48.64 mm; the curvature radius of the second suction contraction part 24 is 25.7 - 29.7 mm, preferably 27.76 mm; the height of the second suction contraction part 24 is 26 - 30 mm, preferably 28 mm; the diameter of the second throat part 25 is 12 - 14 mm, preferably 13 mm; the distance between the second nozzle 22 and the second throat part 25 is 22 - 24 mm, preferably 23 mm; the divergence angle of the second diffuser part 26 is 6 - 8 degrees, preferably 8 degrees. A larger divergence angle of the second diffuser part 26 is beneficial for converting dynamic pressure into static pressure. The height of the second diffuser part 26 is 47 - 51 mm, preferably 49 mm.

[0058] The central fire cover 1 is also provided with a clamping structure 1 27 and a clamping structure 2 28 on the peripheral wall. The clamping structure 1 27 clamps the ignition device, and the clamping structure 2 28 clamps the flame-proof device. The central fire cover 1 is provided with an ignition groove 1 29 corresponding to the ignition device, an air outlet 1, and an ignition groove 2 30 and an air outlet 2 corresponding to the flame-proof device. The ignition groove 1 29 leads to the ignition device to draw air, which is conducive to the ignition and stable combustion of the flame. The ignition groove 2 30 leads to the flame-proof device to ignite. When abnormal flameout occurs, the gas can be turned off. The ignition groove 1 29 and the ignition groove 2 30 both extend to the center of the central fire cover 1. The flame during ignition burns in the center of the central fire cover 1 as much as possible, rather than on the periphery, so as to avoid the central fire cover 1 from being burned red, avoid backfire and explosion, and can burn stably and safely. The air outlet 1 has a similar function to the ignition groove 1 29, and the air outlet 2 has a similar function to the ignition groove 2 30, both of which have a ignition function. A positioning convex ring 31 is provided on the inner wall of the center fire cover 1, and the positioning convex ring 31 divides the cylindrical inner cavity into two upper and lower cavities. A positioning ring groove 32 is provided on the center ejector 3. When the center fire cover 1 is covered on the center ejector 3, the positioning convex ring 31 abuts against the upper edge of the center ejector 3, and the lower edge of the center fire cover 1 abuts against the positioning ring groove 32.

[0059] The specific embodiments described herein are merely examples of the present invention. A person skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner without departing from the present invention or exceeding the scope defined by the appended claims.

[0060] Although more terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the present invention.

Claims

1. A high-power direct injection burner, characterized in that: It includes a central injector (3) and a central burner cap (1). The central injector (3) has a central injection pipe (12). The central injection pipe (12) includes an air intake contraction part one (15), a throat one (16), a diffuser part one (17), and a cone part (18) arranged at the outlet of the diffuser part one (17). A nozzle one (13) is installed at the lower end of the central injection pipe (12). An air inlet one (14) is also opened at the lower end of the central injector (3). The central burner cap (1) covers the upper end of the central injection pipe (12). The central injection pipe (12), the nozzle one (13), and the central burner cap (1) are coaxially arranged. A plurality of fire holes (6) are opened on the top surface (5) of the central burner cap (1). The fire holes (6) are arranged obliquely relative to the axis. The side wall of the central burner cap (1) is closed, or except for the air outlet structure for ignition or anti-extinguishing cooperation, the rest of the side wall of the central burner cap (1) is closed.

2. The high-power direct-injection burner according to claim 1, characterized in that, The diameter of the fire hole (6) is 2.0 - 2.6 mm, the angle between the fire hole (6) and the central axis is 10 - 18 degrees, and the depth of the fire hole of the fire hole (6) is 4 - 6 mm.

3. The high-power direct injection burner according to claim 2, characterized in that, The diameter of the fire hole (6) is 2.3 mm, the angle between the fire hole (6) and the central axis is 15 degrees, and the depth of the fire hole of the fire hole (6) is 6 mm.

4. The high-power direct injection burner according to claim 1 or 2 or 3, characterized in that, An outer fire hole (8) is opened on the periphery of the top surface (5) of the central burner cap (1).

5. The high-power direct injection burner according to claim 4, characterized in that, The diameter of the outer fire hole (8) is 2.3 - 2.6 mm, and the angle between the outer fire hole (8) and the central axis is 60 degrees.

6. The high-power direct injection burner according to claim 5, characterized in that, The diameter of the outer fire hole (8) is 2.5 mm.

7. The high-power direct injection burner according to claim 1 or 2 or 3, characterized in that, A groove (9) is also provided on the top surface (5) of the central burner cap (1). The groove (9) extends from the center to the edge and opens at the edge to form a notch (10).

8. The high-power direct-injection burner according to claim 1 or 2 or 3, characterized in that, A flow guiding protrusion (19) is provided at the center position of the inner top wall of the central burner cap (1). The flow guiding protrusion (19) has a flow guiding outer peripheral surface (20).

9. The high-power direct injection burner according to claim 1 or 2 or 3, characterized in that, The air hole of the nozzle one (13) is located outside the central injection pipe (12).

10. The high-power direct-injection burner according to claim 1 or 2 or 3, characterized in that, The cross-sectional area of any head of the central burner cap (1) is 2 - 4 times the total area of the fire holes. The height of the air chamber (11) of the central burner cap (1) is 5 - 10 mm.

11. The high-power direct-injection burner according to claim 10, characterized in that, The inner cavity of the central burner cap (1) is cylindrical. The cross-sectional area of the head is 3.2 - 3.5 times the total area of the fire holes. The height of the air chamber (11) of the central burner cap (1) is 7 mm.

12. The high-power direct injection burner according to claim 1 or 2 or 3, characterized in that, The inlet diameter of the air intake contraction part one (15) is 46.6 - 50.6 mm, the curvature radius of the air intake contraction part one (15) is 25.7 - 29.7 mm, the height of the air intake contraction part one (15) is 26 - 30 mm, the diameter of the throat one (16) is 12 - 14 mm, the diameter of the nozzle one (13) is 0.7 - 1.2 mm, the distance between the nozzle one (13) and the throat one (16) is 22 - 24 mm, the divergence angle of the diffuser part one (17) is 6 - 8 degrees, the height of the diffuser part one (17) is 47 - 51 mm, the divergence angle of the cone part (18) is 50 - 80 degrees, and the height of the cone part (18) is 8 - 12 mm.

13. The high-power direct injection burner according to claim 12, characterized in that, The inlet diameter of the first air suction and contraction part (15) is 48.64 mm, the curvature radius of the first air suction and contraction part (15) is 27.76 mm, the height of the first air suction and contraction part (15) is 28 mm, the diameter of the first throat part (16) is 13 mm, the distance between the first nozzle (13) and the first throat part (16) is 23 mm, the divergence angle of the first diffuser part (17) is 6 degrees, the height of the first diffuser part (17) is 49 mm, the divergence angle of the conical part (18) is 66 degrees, and the height of the conical part (18) is 10 mm.

14. The high-power direct injection burner according to claim 1 or 2 or 3, characterized in that, The gas outlet structure for ignition includes the first ignition groove (29) or / and the first air outlet hole, and the gas outlet structure for preventing flameout includes the second ignition groove (30) or / and the second air outlet hole. Both the first ignition groove (29) and the second ignition groove (30) extend towards the middle of the top surface of the central burner cap (1).

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