98 results about "Flameout" patented technology

The invention relates to a flameout control method, system and equipment for a gas heating water heater and a medium. The gas heating water heater comprises a sealed combustion system, a Venturi mixer and a pneumatic gas valve which are sequentially communicated, and a command valve of the pneumatic gas valve is connected to an air purification bin of the sealed combustion system through an air pressure pipe. The method comprises the following steps: in a whole machine debugging stage, setting the pressure of a zero-position adjusting spring of a command valve of the pneumatic gas valve to be a negative value; in the operation stage of the water heater, whether the combustion flame is out of flame or not is determined based on the ratio of the gas flow to the air flow; the pneumatic gas valve is closed by the controller in response to a combustion flame off-flame stall. When the smoke pipe is seriously blocked, the pneumatic gas valve can be closed, so that the whole machine is shut down, and the gas heating water heater is protected.

This application claims protection for a pressure vessel, a lighter, and an ignition gun. The pressure vessel includes a gas box and a base plate. The gas box includes a gas box body and a threaded sleeve, which is housed within the gas box body and integrally injection molded with the gas box body. The threaded sleeve is used to connect to an exhaust valve. The base plate is connected and sealed to the gas box body, and a cavity is formed between the gas box body and the base plate to contain fuel. The cavity communicates with the threaded sleeve so that the exhaust valve connected to the threaded sleeve can control the release of fuel. This not only reduces the manufacturing complexity and production cost of the gas box but also ensures the accuracy of the threaded sleeve's assembly position on the gas box body, avoiding tolerance fluctuations and cracking risks between the threaded sleeve and the gas box body. This improves the sealing performance and assembly reliability of the pressure vessel, effectively solving common problems such as poor flameout and ignition failure, and providing a reliable guarantee for the performance improvement of lighters, ignition guns, and other products.

The utility model discloses a third-generation hot air anti-freezing device which comprises a fan device. The fan device comprises a combustion chamber, one end of the combustion chamber is provided with an air supply fan, and the other end is provided with a guide plate connected with a heat conduction pipe; the heat conduction pipe is connected with a heat supply device, the heat supply device comprises a main pipe, two sides of the main pipe are respectively connected with a plurality of branch pipes, the branch pipes are connected with plant planting areas, and the main pipe and the branch pipes are provided with a plurality of heat supply through holes. Remote simultaneous frost prevention and freezing prevention of a plurality of plant planting areas can be achieved, frequent moving of the fan device through a moving device is not needed, labor cost is saved, and waste of labor cost and fuel resources of re-ignition caused by flameout and waiting for cooling of the fan device in order to prevent workers from being scalded by moving the fan device during combustion is not needed. The risk of frost damage and frostbite of vegetation due to the fact that the movable fan device cannot provide heat for the vegetation area in time is also avoided; and the heat can be accurately conveyed to the vegetation area needing the heat, and heat waste is avoided.

This invention discloses a production line for assembling irregularly shaped fireworks and its assembly method. The production line, arranged sequentially along the outer cylinder's flow direction, includes an outer cylinder feeder, an outer cylinder deformation machine, a variable-pitch conveyor, and an outer cylinder fuse-setting machine. This invention overcomes the technical bias of "fuse-setting first, deformation later" in traditional automated fireworks production. It creatively uses the outer cylinder deformation machine to first convert the conventionally arranged fireworks outer cylinder into an irregularly shaped arrangement and shape it. Then, using a variable-pitch conveyor equipped with a specific variable-pitch adjustment mechanism, it smoothly transfers the irregularly shaped arrangement to the outer cylinder fuse-setting machine for drilling and fuse insertion while strictly maintaining this arrangement. The technical solution of this invention fundamentally eliminates the major safety hazards such as wear, flameout, and flashover caused by forced deformation and pulling of the fuse in traditional processes. It not only significantly improves the reliability of irregularly shaped combined fireworks but also possesses strong size compatibility and ease of changeover, greatly improving production efficiency.

A dual-premixed ammonia burner relates to the field of ammonia combustion equipment. Addressing the problems of high ignition energy, slow combustion speed, poor flame stability, and difficulty in achieving stable combustion in large proportions with ammonia, this invention employs a dual premixing structure of auxiliary fuel gas premixed with ammonia and air premixed with ammonia, combined with a three-stage coaxial air duct and a regenerative pre-combustion chamber to achieve stable combustion. The burner includes an ignition gun, a primary air regulating damper, a secondary air regulating damper, a volute-shaped air casing, a primary air annular duct, swirl vanes, an annular ammonia multi-nozzle header, a pre-combustion chamber, a tertiary air multi-nozzle annular pipe, a flame monitor, and dual ammonia and auxiliary fuel inlets. This invention allows for wide load adjustment from 30% to 100%, no flameout at low loads, high burnout rate, and low nitrogen oxide emissions. It can operate with a large proportion of ammonia or pure gas, features a reasonable structure, reliable ignition, and stable safety, and is suitable for zero-carbon retrofitting and efficient utilization of green ammonia in industrial boilers, kilns, and other thermal equipment.

The invention provides an engine control method, a vehicle control unit and a vehicle, and relates to the technical field of vehicle control. According to the method, an engine is not controlled under the conditions that a hand brake is pulled up and the opening degree of an accelerator is smaller than a first preset opening degree threshold value, and an accelerator pedal signal is responded through an ECU; the purposes of preventing the vehicle from suddenly moving due to mistakenly stepping on the accelerator during parking and avoiding accidents are achieved, meanwhile, when the hand brake is loosened and the brake opening degree is smaller than the preset brake opening degree threshold value, the engine is switched into the rotating speed control mode, the purposes of providing proper engine braking force and avoiding engine flameout are achieved when the vehicle is slightly braked, and the safety of the vehicle is improved. Therefore, the technical problem of engine flameout during starting of the AMT is solved, and the technical effects that vehicle jerking caused by engine flameout is avoided, and smoothness and comfort in the driving process are improved are achieved.

The utility model provides a gas stove panel which comprises a panel body, two burners, two stove frames and two ignition knobs, the two burners are installed on the two sides of the top of the panel body respectively, and the two stove frames are arranged outside the two burners in a sleeved mode respectively and placed on the top of the panel body. Compared with the prior art, the energy-saving stove has the advantages that the periphery of the stove head is covered with the wind shielding frame in the wind shielding assembly, the left side and the right side of the wind shielding frame are closed, and therefore small flames generated by the stove head can be shielded, and the phenomena of flameout and air leakage are avoided; according to the gas stove, external oxygen can be guaranteed to be normally conveyed into the air blocking frame, sufficient oxygen is provided for combustion of gas, and therefore the phenomenon that the gas is extinguished in the combustion process is effectively reduced, and the use safety of the gas stove is effectively improved.

The application discloses a burner, a burner assembly and a cooking stove. The burner comprises a lower plate, an upper plate arranged on the lower plate and a partition plate. The lower plate is formed with a lower channel, and the upper plate is formed with an upper channel. The partition plate is arranged between the lower plate and the upper plate and separates the lower channel from the upper channel. The burner of the application separates the lower channel and the upper channel by the partition plate, which is equivalent to separating the lower channel and the upper channel into two independent sub-burners, the cross-sectional area of each sub-burner is smaller, and therefore, the depth of the sub-burner is relatively deeper. In this way, the phenomenon that the flame enters the gas channel to burn and produce a flameout noise at the moment when the gas valve is closed can be avoided. In addition, the equivalent cross-sectional area formed by the lower channel and the upper channel does not change, and the burner can have a larger flame.

The invention provides a pollutant spatial distribution and blow-off and tempering limit measurement method based on a flat flame burner, and relates to the technical field of combustion experiment measurement. According to the method, on the basis of a flat-flame burner, a quartz cover is arranged above the flat-flame burner to form a locally-closed space, and a long-strip-shaped measuring window is formed in the side face; an X-Y plane movable precision probe structure is arranged on the outer side of the window, so that the tip of the sampling probe can extend into a region adjacent to the flame at any coordinate point in the window plane; a camera is arranged on the outer side of the quartz cover, and a camera pixel coordinate probe physical coordinate conversion relation is established through calibration; controlling the probe to move point by point according to a preset scanning path, synchronously collecting pollutant concentration and flame images, and obtaining a pollutant two-dimensional or three-dimensional distribution field under a given working condition; parameters such as gas flow and air-fuel ratio are adjusted, the blow-off / tempering limit is approached and crossed, scanning is repeated at key nodes, and pollutant distribution characteristics in different combustion stability states are obtained.

This invention discloses a pneumatic concave cavity flame stabilization device for an afterburner, comprising a central cylinder, an annular combustion chamber shell, a diffuser, an afterburner shell, a pneumatic concave cavity pipe, and a central cylinder connecting rod. The diffuser fixes the annular combustion chamber shell and the afterburner shell together. The central cylinder is fixed to the center of the annular combustion chamber shell via the central cylinder connecting rod. The pneumatic concave cavity pipe extends through the central cylinder into the afterburner shell. The vertical jet from the pneumatic concave cavity exhaust port of this invention can enhance the recirculation zone and stably maintain a low-speed recirculation vortex under different operating conditions, stabilizing the combustion operating range and reducing the risk of flameout. The vertical jet from the pneumatic concave cavity exhaust port of this invention can entrain fuel and air into the cavity, prolonging the fuel residence time and fundamentally improving combustion efficiency. The vertical jet from the pneumatic concave cavity exhaust port of this invention can fill the low-pressure zone at the rear edge of the cavity, reducing resistance, significantly reducing total pressure loss, and improving engine thrust efficiency.

The invention relates to the technical field of a decomposition rotational flow ammonia-doped pulverized coal burner combustion state real-time monitoring system based on infrared temperature measurement, and adopts the core technical scheme that the decomposition rotational flow ammonia-doped pulverized coal burner combustion state real-time monitoring system comprises an optical detection module, a signal processing module, a data fusion module and a graded monitoring module, wherein the optical detection module synchronously collects infrared radiation and ultraviolet chemiluminescence signals of combustion flames through an optical lens and a spectroscope, and the signal processing module processes a multiband infrared image and a free radical luminescence image to obtain a two-dimensional temperature field and distribution parameters. The data fusion module extracts feature parameters and generates comprehensive feature vectors, and the hierarchical monitoring module outputs qualitative state labels and quantitative risk scores based on an analysis model. According to the scheme, the problems that in the prior art, due to dependence on a single monitoring parameter, diagnosis of the ammonia-doped combustion state is not comprehensive, and the risk of ammonia escape or flameout cannot be early warned are solved, and the beneficial effects that the monitoring accuracy is improved, multi-parameter intelligent fusion diagnosis is achieved, and the combustion efficiency is optimized through active early warning are achieved.

An infrared combustor fast in ignition and capable of achieving flameout protection comprises an infrared combustion plate, a furnace end, a fire distributor base, an inner annular gland, an ignition induction assembly and a decoration ring, an outer ring gas inlet connector is inserted into an outer ring gas groove, and a bottom plate of the inner ring combustion groove covers the top of the inner ring combustion groove; the infrared combustion plate is arranged in the annular plate cavity and covers the upper end of the inner ring combustion groove and the upper end of the outer ring combustion groove, the cylindrical inserting part is inserted into an inner ring wall plate of the annular plate cavity, the annular pressing plate part is buckled with the infrared combustion plate, and the ignition induction assembly is fixed to the fixing base plate and opposite to the power receiving ignition part. The electric ignition part is arranged on the inner annular gland and is matched with the ignition needle, so that rapid ignition is realized, and the accuracy is high; and the induction needle is arranged, so that flameout protection is realized.

The invention discloses a gas valve integrating safety flameout protection and reset functions. The gas valve comprises a valve body, a flameout protection electromagnetic valve, a valve element assembly, a detection control mechanism and a linkage clamping and locking mechanism. The valve body is provided with a gas inlet channel, a first gas outlet channel and a second gas outlet channel, the flameout protection electromagnetic valve is used for closing and opening gas input of the gas inlet channel to the gas valve, and the valve element assembly comprises a valve element and a valve shaft and is used for controlling gas output of the first gas outlet channel and the second gas outlet channel. The detection control mechanism comprises a valve rod, a sealing plug and a valve rod reset elastic piece, the valve rod is at the closing position, the sealing plug cuts off gas output of the second gas outlet channel, the valve rod is at the opening position, the second gas outlet channel can output gas, and the linkage clamping and locking mechanism is used for clamping and locking the position of the valve rod when the valve rod enters the closing position and locking the valve rod when the valve shaft axially acts relative to the valve element. And clamping and locking of the linkage clamping and locking mechanism on the valve rod can be relieved. The gas valve is convenient to install, use and reset.

The utility model relates to the field of catering production, in particular to a cooking gas large cooking stove with flameout protection, which comprises a large cooking stove, a gas inlet pipe is mounted on the right side of the large cooking stove, an electromagnetic valve is mounted on the gas inlet pipe, an igniter is arranged at the bottom in the large cooking stove, and annularly distributed exhaust ports are formed in the upper part of the large cooking stove. And an opening and closing machine is arranged on the large cooking range. According to the utility model, through a dual protection mechanism that the electromagnetic valve cuts off a gas source and the exhaust port is locked through rapid operation, a gas leakage path is instantaneously isolated and a re-combustion condition is blocked, so that the flameout safety level is greatly improved, and the locking piece cooperates with the limiting block to ensure the sealing reliability and the opening and closing stability of the opening and closing cover.

The invention provides a valve shaft assembly structure of a household gas flameout protection device, which reduces the friction between a valve shaft and an electromagnetic sheet and between the valve shaft and a plastic shell, further improves the failure of an electromagnetic valve caused by the falling of chippings, and ensures that the gas flameout device can work normally for a long time. According to the technical scheme, the electromagnetic valve comprises a valve shaft, a sealing gasket, a spring, a plastic shell, an electromagnetic sheet and an electromagnet. The valve is characterized in that the valve shaft is made of a macromolecule wear-resistant self-lubricating material, a plurality of locking positioning flaps which are arranged in an outward diffusion mode from top to bottom are arranged at the bottom of the valve shaft, and the locking positioning flaps are annularly distributed at intervals; a compression space is reserved in the center area of the bottom of the valve shaft corresponding to the center areas of the locking positioning flaps which are not directly connected, and a center hole of the electromagnetic sheet is installed and fixedly arranged along the locking positioning flaps from bottom to top in an upward moving mode. And a guide sleeve at the upper part of the plastic shell is sleeved on the outer ring surface of the corresponding height position of the valve shaft.

The utility model provides a flameout electromagnetic valve coil, and belongs to the technical field of electromagnetic valve accessories. The problem that an existing flameout electromagnetic valve is poor in coil winding effect is solved. The flameout solenoid valve coil comprises a coil holder, a first winding groove and a second winding groove are formed in the two sides of the exterior of the coil holder respectively, a thin copper wire is wound on the inner wall of the first winding groove, a thick copper wire is wound on the inner wall of the second winding groove, and a high-heat-conduction insulating layer is arranged on the inner wall of the second winding groove and located on the outer side of the thick copper wire. And the inner walls of the winding groove I and the winding groove II and the gap between the thin copper wire and the thick copper wire are filled with a paraffin-based phase change filler. The winding device has the advantages of being reasonable in structural design, good in winding effect, good in electromagnetic performance and the like.

The utility model discloses a low-load stable-combustion combustion device of a tangential combustion boiler, which belongs to the technical field of tangential combustion boilers and comprises an over fire air assembly, a combustor assembly and a peak regulation combustor assembly which are sequentially arranged on the tangential combustion boiler from top to bottom. The peak regulation combustor assembly is used for forming large imaginary circle combustion airflow in the boiler; the combustor assembly is used for forming small imaginary circle combustion airflow in the boiler. The over fire air assembly is used for providing additional oxygen, and it is ensured that combustible materials in the boiler are completely combusted. The low-load stable-combustion combustion device of the tangential combustion boiler can effectively solve the problems that in the deep peak regulation process of the tangential combustion boiler in the prior art, the temperature of a hearth is lowered, pulverized coal is difficult to ignite, flame stability is poor, flameout is prone to occurring, and major accident potential of fire extinguishing of the hearth exists.

The utility model belongs to the technical field of gas stoves, and discloses a self-adaptive flame-out protection device adopting a multi-sensor fusion technology, which comprises a device body and a dismounting piece, the device body comprises a shell and a rear cover, one side of the shell is provided with an opening, the rear cover is fixedly arranged at the opening of the shell through a screw, the dismounting piece comprises a connecting plate, and the connecting plate is fixedly connected with the shell. A V-shaped elastic clamping head is formed at one end of the connecting plate, a clamping block is formed at the other end of the connecting plate, a first clamping groove is formed in the upper end of one side of the shell, a second clamping groove is formed in the upper end of one side of the rear cover, the clamping block is inserted into the second clamping groove, and the V-shaped elastic clamping head is clamped in the first clamping groove. The V-shaped elastic clamping head and the clamping block of the disassembly and assembly piece are matched with the first clamping groove and the second clamping groove, and compared with a traditional screw fixing mode, rapid assembly and disassembly are achieved, and operation efficiency is greatly improved.

The utility model provides a flameout electromagnetic valve, and belongs to the technical field of automobile accessories. The problem that an existing flameout electromagnetic valve is short in service life is solved. The flameout electromagnetic valve comprises a valve shell, cooling fins are welded to the surface of the valve shell, a mounting insertion plate is welded to the rear side of the valve shell, a sleeve shell sleeves the rear side of the mounting insertion plate, mounting bolts are movably connected to the four corners of the sleeve shell in a penetrating mode, a cushioning seat is arranged on the rear side of the sleeve shell and comprises a fixing shell, and a connecting sliding plate is slidably connected to an inner cavity of the fixing shell; a damping spring is fixedly connected to the rear side of the connecting sliding plate, a damping pad adheres to the front side of the fixing shell, a movable iron core is installed at the top of an inner cavity of the valve shell in a penetrating mode, and a static iron core is installed at the bottom of the inner cavity of the valve shell. The motor has a vibration reduction function and is good in heat dissipation effect and long in service life.

The invention provides an anti-flameout hydraulic system of a skid steer loader and the skid steer loader, and relates to the field of skid steer loaders. The series pump comprises a first closed plunger pump, a second closed plunger pump and an open gear pump; two working oil ports of the first closed plunger pump and the second closed plunger pump are respectively communicated with oil inlets and oil outlets of the left walking motor and the right walking motor; oil inlets and oil outlets of the left travel motor and the right travel motor are respectively communicated with corresponding oil inlets of the shuttle valve; a pressure oil outlet of the shuttle valve is communicated with a pressure oil inlet of the power valve; an oil inlet of the oil source valve is communicated to a pressure oil port of the open gear pump, and a pilot oil outlet of the oil source valve is communicated to a pilot oil inlet of the power valve; a pilot oil outlet of the power valve is communicated with an oil inlet of the multi-union operating valve; and working oil ports of two accessory units in the multi-unit operating valve are respectively communicated with pressure control oil ports of the first closed plunger pump and the second closed plunger pump. According to the hydraulic system, the flameout probability of the engine can be reduced, the structure is simple, and the cost is low.

The application discloses an automatic gearbox anti-flameout control method, which calculates an anti-flameout self-help rotating speed by monitoring signals such as engine rotating speed and engine idling rotating speed, combining with a predetermined bottom line rotating speed and processing time, compares the anti-flameout self-help rotating speed with the engine rotating speed and the idling rotating speed, identifies the possible flameout risk of the engine in advance, triggers the anti-flameout self-help function to activate in the first time, makes the TCU enter an anti-flameout processing mode in a short time, controls the clutch to cut off power transmission, and avoids the flameout caused by the non-expected transmission torque of the gearbox leading to the excessive engine load. The application can be applied to any working condition in the vehicle driving process, effectively identifies the triggering time of the anti-flameout function, timely cuts off the torque transmission between the engine and the gearbox, thereby reducing the vehicle flameout risk, avoiding the uncontrollable danger of the vehicle caused by the flameout, and even avoiding the personal harm.

The invention discloses a support plate stabilizer structure for enhancing fuel oil atomization and suitable for an afterburner, which is used for improving the fuel oil atomization effect and the combustion stability, and comprises two support plate outer edge frames, a support plate tail edge frame, a fuel oil injection rod and the like, and a support plate mixing channel is formed between the two support plate outer edge frames; and a plurality of cooling air cavities are formed in the main body part so as to prevent key parts from being ablated in a high-temperature environment. First fuel oil impacts the fan-shaped channels through the oil injection holes to form an oil film, is further atomized under the shearing action of airflow and is mixed with air, and premixed gas is formed and then enters the concave cavity to be combusted. According to the design, flames in the concave cavity can be kept stable under the extreme conditions of low temperature, low pressure and the like, so that the ignition and flameout boundary of the combustion chamber is widened, meanwhile, high-temperature fuel gas in the concave cavity can heat transverse jet flow of second fuel oil, and the evaporation and mixing efficiency of the second fuel oil is improved. By means of the integrated design, the number of components is reduced, the flow resistance in the non-stress-application state is reduced, and meanwhile the thrust-weight ratio is increased.

1. Name of the designed product: valve (with flameout protection). 2. Use of the designed product: used for gas stove valve. 3. Design points of the designed product: the overall shape of the product. 4. Picture or photo that best shows the design points: perspective view.

The invention provides a turbofan engine starting and flameout detection method and system. The method comprises the steps that the rotating speed change rate of an engine is determined; determining an exhaust temperature; determining the total pressure ratio of the engine, wherein the total pressure ratio of the engine is related to compressor outlet static pressure and engine inlet total pressure; if any two of the following characteristics are met, it is judged that the engine is started and flamed out: the first characteristic is that the engine speed change rate is smaller than a first threshold; secondly, the engine speed change rate is smaller than a second threshold value, and the exhaust temperature is monotonically decreased; thirdly, the total pressure ratio of the engine is smaller than a third threshold value, and the third threshold value is related to the rotating speed of the engine.

The invention relates to a control technology of a gas heating furnace, in particular to a combustion method for preventing fins of a heat exchanger of the heating furnace from generating condensate water. According to the method, intermittent combustion is achieved through a C mode, and a user selects three gears C1, C2 and C3 according to needs to correspond to the target temperature of a room. The system takes 45 DEG C as a target for heating, timing is started for 15 min when the temperature of heating outlet water is larger than or equal to 40 DEG C, and flameout is conducted immediately after timing is finished; and the circulating pump continuously operates, ignition is conducted again after the water temperature is reduced to the return difference temperature of the corresponding gear, and circulating operation is conducted. The method prevents the surface of the heat exchanger from being lower than the smoke dew point to generate acidic condensate water, prevents a room from being overheated, prolongs the service life of the heat exchanger and a combustor, and saves fuel gas.

The invention belongs to the technical field of infrared combustors, and provides a high-reliability integrated infrared combustor which comprises an infrared burner, an infrared combustion plate, a double-needle assembly and an ignition electrode assembly. The infrared furnace end comprises a central bracket, a small furnace chamber, a large furnace chamber, an inner injection pipe and an outer injection pipe; the double-needle assembly comprises an ignition needle and a temperature measuring element; the discharge end of the ignition needle and the working end of the temperature measuring element are positioned above the infrared combustion plate; the ignition electrode assembly is fixed to a top port of the center support and comprises a first flange and a center flat plate. The first flange is arranged on the outer edge of the central flat plate, and the central flat plate is provided with a first avoiding hole and a second avoiding hole which are used for the ignition needle and the temperature measuring element to penetrate through. The infrared burner has the advantages of being high in ignition success rate and flame-out protection reliability, low in power consumption, simple in structure and convenient to install.

This invention relates to the field of aerospace technology and discloses an air intake structure, a power system, and an aircraft. The air intake structure includes a first air duct, a second air duct, and a switching component. The first air duct extends along a first direction, with one end connected to a third air intake of the combustion chamber and the other end connected to a first air supply device. The second air duct extends along the first direction, with one end also connected to the third air intake of the combustion chamber and the other end connected to a second air supply device. The third air intake is connected to two channels of the combustion chamber, which are connected to the combustion chamber cavity. The switching component can switch the air duct connected to the third air intake, or control both the first and second air ducts to be connected to the third air intake, thereby ensuring the stability of the core flow field, such as the central recirculation zone of the combustion chamber, eliminating the risk of flameout caused by flow field distortion, and greatly improving the reliability of the power system under emergency conditions.

The ignition nozzle for improving the point flameout performance of the present application is provided with two independent oil collecting cavities, including a first oil collecting cavity and a second oil collecting cavity, the first oil collecting cavity is communicated with a first oil path, and the second oil collecting cavity is communicated with a second oil path, wherein the first oil path is discharged into a flame tube through a nozzle head, the second oil path is discharged into the flame tube through an adjustable valve assembly and the nozzle head, the adjustable valve assembly is used for increasing the oil supply in the second oil path when the engine is ignited, improving the engine point flameout performance, reducing the oil supply in the second oil path when the engine reaches a preset working state, adjusting the total flow of the ignition nozzle and keeping the total flow of the non-ignition nozzle consistent, thereby meeting the uniformity requirement of the main state main combustion chamber outlet temperature field.

The invention relates to the technical field of kitchen appliances, in particular to a burner. Comprising a burner, at least one annular gas cavity is formed in the burner, the upper end of the annular gas cavity is open, and a gas inlet is formed in the lower end; and the fire cover assembly correspondingly covers the upper end of the annular air cavity, the fire cover assembly is provided with an air outlet hole and an annular channel, the air outlet hole communicates with the annular air cavity and the annular channel, the annular channel inclines inwards from bottom to top, and an annular fire gap with an upward opening is formed in the inner end of the annular channel. The channels inclined inwards can enable gas to form concentrated upward flames at the annular fire gaps, horizontal diffusion or fluctuation of the flames is avoided, flame concentration is enhanced, heat loss to the periphery is reduced, the heat utilization rate and heating efficiency are greatly improved, and the requirements for rapid heating and accurate temperature control are met. And meanwhile, the inclined structure can reduce the flowing resistance of the fuel gas in the channel, and is matched with the annular fire seam with an upward opening, so that the combustion stability is further improved, and the phenomena of backfire and blow-off are avoided.