4443results about "Gaseous heating fuel" patented technology

The embodiment of the invention provides an anti-dry-burning control method, a controller and a stove. The method comprises the steps that a controller in the cooker detects the temperature of the bottom of a pot in real time, and when the temperature of the bottom of the pot reaches a preset temperature threshold value, the current change rate of the temperature of the bottom of the pot is obtained; and when the controller determines that the current change rate of the temperature is smaller than an empty burning threshold value but is between a first dry burning threshold value and a second dry burning threshold value, the controller determines that the cookware enters an anti-dry burning state and executes an anti-dry burning program. Wherein the first dry burning threshold value and the second dry burning threshold value are determined according to the environment information and the type of the cookware. The method is used for achieving the effect of improving the anti-dry-burning flexibility.

The process parameters can be preset, the quality problem is prevented in advance, automatic production is achieved, and the production efficiency is improved. The invention is applicable to the technical field of range hood control, and provides an intelligent oil fume machine and an oil fume separation method thereof, and the method is applied to an intelligent range hood oil fume separation control system. The system comprises an information acquisition module, a model construction module, a model training module, a model evaluation module, a parameter determination module, an application control module, a wireless communication module, a memory, an alarm, a processing center and an intelligent mobile terminal. The information acquisition module, the model construction module, the model training module, the model evaluation module, the parameter determination module, the application control module, the wireless communication module, the memory and the alarm are respectively connected with the processing center; the invention further provides an intelligent oil fume machine. Operation data of the range hood can be collected, the preset control parameters are matched according to the model, and automatic precise control is achieved.

The invention relates to the technical field of kitchen safety monitoring, and discloses a kitchen gas stove abnormity early warning system based on infrared thermal imaging multispectrum. The system comprises an infrared thermal imaging acquisition module, a dynamic feature extraction module and an abnormal behavior identification module. The infrared thermal imaging acquisition module synchronously captures the surface temperature field distribution of the gas cooking range through a multispectral infrared sensor array, obtains flame form data in combination with a visible light image, and generates a multi-channel fused infrared thermal imaging characteristic spectrum through processing. The dynamic feature extraction module adopts a three-dimensional convolution kernel to scan continuous time sequence frames, identifies flame morphological feature differences, calculates thermal radiation intensity energy distribution offset, and outputs dynamic feature vectors. The abnormal behavior recognition module extracts a correlation mode through a deep residual network, compares current features with a historical normal working condition feature library, and generates a preliminary early warning signal containing an abnormal type code and a risk level when the attenuation rate of flame spectral energy in a specific infrared band exceeds a first threshold value.

The invention discloses an efficient pulsating heat pipe air pre-heater gas stove, and relates to the technical field of gas stoves. The air pre-heater comprises an air pre-heater body, a pulsating heat pipe and an air supply pipeline, the pulsating heat pipe is embedded in an inner cavity of the air pre-heater body, and the bottom of the air pre-heater body communicates with the top of the air supply pipeline; the air pre-heater body comprises a heat insulation radiation cavity and an air pre-heating cavity. The heat transfer efficiency of the pulsating heat pipe is far higher than that of traditional metal heat conduction, heat of high-temperature flue gas can be rapidly absorbed, waste heat loss is reduced, the heat efficiency is improved, secondary air is heated through the air preheater, the temperature of the secondary air is increased, the combustion temperature is increased, gas combustion is more sufficient, emission of carbon monoxide and nitric oxide is reduced, and the energy-saving and environment-friendly effects are achieved. The pulsating heat pipe has the unique advantages of being small and exquisite in structure, flexible in arrangement and efficient in heat transfer, and the heat efficiency of the gas stove is effectively improved through the L-shaped pulsating heat pipe heat insulation air pre-heater structure.

The utility model discloses cooking equipment, which comprises a cooking device, a heating device and a control device, the gas steaming and baking module is connected with the cooking device and used for supplying steam and / or smoke to the cooking cavity, the gas steaming and baking module comprises a combustor, the combustor comprises a body and a gas supply structure, the body defines a combustion cavity, the gas supply structure defines a gas mixing cavity communicated with the combustion cavity, and the gas supply structure is provided with a gas inlet, an air inlet and an outlet; the gas inlet communicates with the gas mixing cavity, the air inlet communicates with the gas mixing cavity, the gas mixing cavity communicates with the combustion cavity through the outlet, and the combustion cavity is suitable for introducing gas in the gas mixing cavity. According to the cooking equipment provided by the embodiment of the utility model, the gas supply structure with the gas mixing cavity is arranged on the combustor, and the gas mixing cavity is communicated with the combustion cavity of the combustor, so that the premixing of the gas and the air can be realized, the sufficient mixing of the gas and the air can be ensured, and the sufficient combustion of the gas can be ensured.

The invention discloses cooking equipment which comprises a cooking device provided with a steam inlet; the steam device comprises a combustion chamber, a combustor and a water pipe, the combustor is arranged in the combustion chamber and is configured to be heated through fuel gas, at least one part of the water pipe is arranged in the combustion chamber and is matched with the combustion chamber in a heat exchange mode, and the water pipe is connected with the steam inlet so as to supply steam to the cooking equipment. According to the cooking equipment disclosed by the embodiment of the invention, the steam can be generated by heating the fuel gas, and the steam is provided for the cooking device, so that the cooking of the steam device is facilitated. Steam is generated through gas heating, the limitation of electric heating can be broken through, and the power of the steam device can be greatly improved.

The invention relates to the technical field of smart home, and discloses an automatic range hood starting device and method based on a sensing function, and the device comprises a sensor module which is used for collecting kitchen environment data and comprises an infrared sensor, a lampblack concentration sensor, a sound sensor and a temperature and humidity sensor; the data processing module comprises a microcontroller and is used for receiving and fusing the real-time data of the sensor module, calculating the weight of the data of each sensor through a mutual information algorithm and generating a comprehensive cooking state index; and the control execution module is connected with the range hood fan and the fan blade adjusting mechanism, and dynamically adjusts the rotating speed of the fan, the fan blade angle and the operation mode according to the comprehensive cooking state index and the pollution diffusion model. According to the technical scheme of determining the weight by adopting the multi-sensor data fusion and mutual information algorithm, the effect of accurately judging the cooking state is achieved by calculating the association degree of the data of each sensor and the cooking state and allocating the weight.

The invention relates to the field of kitchen utensils, and particularly discloses a fire control valve and a kitchen range. The fire control valve comprises a shell, an outer ring electromagnetic valve and an inner ring electromagnetic valve; the plug valve communicates with the inner ring outer cavity, and the inner ring inner cavity and the outer ring inner cavity communicate with an inner ring fire cover and an outer ring fire cover of the combustor correspondingly. The inner ring electromagnetic valve is used for opening and closing an inner ring flow path between the inner ring outer cavity and the inner ring inner cavity, and the outer ring electromagnetic valve is used for opening and closing an outer ring flow path between the outer ring outer cavity and the outer ring inner cavity; a first port and a second port of the inner ring closure channel are respectively communicated with the inner ring outer chamber and the inner ring inner chamber; and a first port and a second port of the inner ring communication channel are respectively communicated with the inner ring inner cavity and the outer ring outer cavity. The fire control valve can replace an original plug valve to achieve the function of opening and closing outer ring fire, the structure of the plug valve can be simplified, multiple fire adjusting states corresponding to different cooking modes can be achieved, and fire adjusting of a cooker is more intelligent.

The invention provides a combustion control method for a commercial gas stove. The combustion control method comprises the following steps: acquiring post-combustion gas component data acquired by a gas component sensor; gas component data obtained after combustion serve as feedback quantity, the error between the feedback quantity and a preset expected value is calculated, combustion control parameters are calculated through a closed-loop control algorithm on the basis of the error, and the combustion control parameters comprise the opening degree of a main fire gas valve and / or the rotating speed of a first draught fan; and the air supply amount and / or the air supply amount of the main fire combustor are / is adjusted according to the combustion control parameters. The invention further provides a combustion control device and system for the commercial gas stove and the commercial gas stove. According to the invention, the mixing ratio of the air and the fuel gas is adaptively adjusted by detecting the gas component data after combustion and combining a closed-loop control algorithm, so that the combustion efficiency is optimized.

The utility model belongs to the technical field of valves, and particularly discloses an electromagnetic valve, a gas valve and gas equipment. The electromagnetic valve comprises an electromagnetic driving mechanism, a movable shaft assembly, a valve element assembly, a pressing piece, a pressing reset piece and a timing trigger piece. The pressing piece is arranged on the shell in a sliding mode and matched with the second end of the movable shaft assembly, the pressing piece can actuate the movable shaft assembly to slide to the adsorption position from the separation position when being pressed to the first position from the initial position, a conductive structure is arranged on the pressing piece, and the movable shaft assembly in the adsorption position can magnetically adsorb the valve element assembly to move to the opening position. The electromagnetic driving mechanism can drive the valve element assembly to move to the closing position in the power-on state. And the timing trigger piece is electrically conducted with the conductive structure when the pressing piece reaches the first position, so that the timing trigger circuit is conducted. According to the gas valve timing device, timing closing of the electromagnetic valve and the gas valve can be achieved through a simple and reliable structure, repeated timing can be carried out, and the use safety, reliability and convenience of the gas valve and gas equipment are improved.

The utility model discloses a kitchen range. The kitchen range comprises a burner and a pot rack, a plurality of first fire outlet holes are formed in the top of the combustor; the pot rack comprises a pot rack main body and a plurality of supporting legs, the pot rack main body is arranged around the periphery of the burner, the supporting legs are arranged at the bottom of the pot rack, and the supporting legs are arranged around the peripheral side of the pot rack main body at intervals; the inner circumferential side face of the pot rack body comprises a flow guide air inlet face, the flow guide air inlet face extends upwards from the bottom of the pot rack body, the flow guide air inlet face and the burner are arranged in a spaced mode, and a first air inlet channel communicated with the first fire outlet holes is formed between the flow guide air inlet face and the outer circumferential side face of the burner. An air inlet channel does not need to be formed in the pot rack body, so that the sealing integrity of the pot rack body can be guaranteed, and the heat preservation performance of the pot rack body can be improved.

The utility model discloses a stacked fire cover, a combustor and a stove, and belongs to the technical field of kitchen electric appliances. The stacked fire cover is formed by alternately stacking a plurality of first laminations and a plurality of second laminations, the first laminations and the second laminations are each of a hollow sheet-shaped structure, the first laminations are provided with concave parts extending in the radial direction of the first laminations, the multiple concave parts are arranged at intervals along the circumferential sides of the first laminations, and a groove is formed between every two adjacent concave parts; the outermost layers of the stacked fire covers are second laminations, and the second laminations attached to the outer surfaces of the concave parts are matched with the single grooves to form single fire outlet holes extending in the radial direction of the first laminations. According to the stacked fire cover, the height of the stacked fire cover can be flexibly adjusted according to needs so as to meet the needs of combustors of different sizes, the design cost and the manufacturing cost can be reduced, and market popularization of products is facilitated. The burner and the stove are low in cost by applying the stacked fire cover, and market popularization of products is facilitated.

The invention relates to the field of kitchen utensils, and particularly discloses a fire control valve and a kitchen range. The fire control valve comprises a shell, an inner ring electromagnetic valve and an outer ring electromagnetic valve; an air inlet channel of the shell is communicated with the plug valve and the outer cavity; the inner-ring electromagnetic valve is used for opening and closing an inner-ring flow path, and the outer-ring electromagnetic valve is used for opening and closing an outer-ring flow path; the inner ring gas outlet channel and the outer ring gas outlet channel supply gas to an inner ring fire cover and an outer ring fire cover of the combustor correspondingly and communicate with an inner ring inner cavity and an outer ring inner cavity correspondingly. And a first port and a second port of the inner ring closure channel are respectively communicated with the inner cavity and the outer cavity of the inner ring. The fire control valve can replace an original plug valve to achieve the function of opening and closing outer ring fire, so that the structure of the plug valve can be simplified, the longitudinal size can be reduced, and meanwhile, the fire control valve can be used for opening and closing the inner ring flow path and the outer ring flow path through the inner ring electromagnetic valve and the outer ring electromagnetic valve and the inner ring closure channel. Various fire adjustment states corresponding to different cooking modes can be realized, so that fire adjustment of the cooker is more intelligent.

The invention relates to a combustor and a gas stove. The combustor comprises a furnace end, a gas inlet and a gas outlet, an inner ring gas mixing cavity and a middle ring gas mixing cavity are defined between the inner ring fire cover and the furnace end, and the middle ring gas mixing cavity is arranged on the periphery of the inner ring gas mixing cavity in a surrounding mode; inner ring fire holes are formed in the top surface of the inner ring fire cover; the outer ring fire cover is arranged on the periphery of the inner ring fire cover in a surrounding mode at intervals, and an outer ring gas mixing cavity is defined between the outer ring fire cover and the furnace end; a top cover is arranged in the center of the top face of the inner ring fire cover in a protruding mode and covers the top of the inner ring fire hole. An inner ring fire gap is formed between the outer peripheral edge of the top cover and the top face of the inner ring fire cover, the inner ring fire holes are communicated with the inner ring fire gap, fuel gas in the inner ring gas mixing cavity can be combusted at the inner ring fire gap to form inner ring gap fire, flames of the inner ring gap fire are mutually connected, and the good flame stabilizing effect is achieved. And therefore, the flame stability of the combustor under soft fire combustion or extremely soft fire combustion is improved, and the low-temperature cooking requirement is met.

The pot rack comprises a pot rack body and a power device, the pot rack body is annularly arranged and forms a combustion cavity in a surrounding mode, the combustion cavity is used for allowing flame of a combustor to pass through, the pot rack body is further provided with a jet flow channel and an air supply channel, and a jet flow opening of the jet flow channel is located in the upper surface or the peripheral face of the pot rack; an air supply port of the air supply channel is communicated with the combustion cavity; the power device communicates with the jet flow channel and the air supply channel and is used for providing airflow for the jet flow channel and the air supply channel and providing airflow in the direction close to the cooker through a jet flow opening of the jet flow channel, so that smoke between the pot rack body and the cooker can be gathered in the direction close to the cooker; and secondary air is supplemented to the combustion cavity through the air supplementing opening, so that the air content in the combustion cavity can be increased, the fuel is promoted to be combusted more sufficiently, the heat efficiency of the fuel is improved, and the overall heat efficiency of the gas stove is improved.

The utility model relates to a range hood air volume adjusting device and a range hood system. The range hood air volume adjusting device comprises a printed circuit board, a conductive carbon film, a stove control panel, a metal elastic piece and a range hood control module. The printed circuit board is fixed at the bottom of the kitchen range knob, and a conductive carbon film is printed on the printed circuit board; the head part of the metal elastic sheet is connected with a rotating shaft of a kitchen range knob, and a metal contact is arranged at the tail part of the metal elastic sheet and is in contact connection with the conductive carbon film; the metal contact is used for rotating on the conductive carbon film and generating a corresponding resistance value; the conductive carbon film is connected with the cooker control panel; the cooker control panel is used for generating cooker firepower information corresponding to the resistance value; the cooker control panel is in communication connection with the range hood control module, and the range hood control module is used for adjusting the air volume of the range hood to the air volume corresponding to the cooker firepower information. According to the technical scheme provided by the invention, linkage of the range hood and the stove and accurate adjustment of the air volume of the range hood can be realized, and meanwhile, the use experience of a user is also improved.

The invention discloses a stove firepower display control method, a stove and a range hood. The stove firepower display control method provided by the embodiment of the invention is applied to the stove. The cooker comprises a mechanical knob and a potentiometer. The mechanical knob is connected with the potentiometer. And when the mechanical knob rotates, the potentiometer is driven to rotate synchronously, so that the resistance of the potentiometer is changed. The stove is in communication connection with the range hood. The range hood comprises a control panel. The control method comprises the steps of obtaining output voltage of the potentiometer; determining the gas flow of the cooker according to the output voltage; and the gas flow is sent to the range hood, so that the firepower state corresponding to the gas flow is displayed through the control panel. Therefore, the firepower state of the kitchen range can be used as visual data to be displayed on the control panel of the range hood, and the problem that a user is difficult to accurately and timely identify the firepower condition of the kitchen range is effectively solved.

The invention discloses a high-efficiency high-fire combustion system which is characterized by comprising a furnace end assembly, an injection pipe, a gas distribution ring, an air door plate, an air blowing box, an air blower and a valve body assembly, the air door hole extends towards the air inlet end of the injection pipe to form an air door ring wall; the outer wall of the part, extending into the blast cavity, of the gas nozzle and the annular wall of the air door form a blast air guide channel; the air blowing and guiding channel is arranged on the periphery of the gas nozzle in a surrounding mode. According to the invention, in a high-fire combustion state, the bypass air channel supplements additional high-fire gas to the high-fire gas supply cavity on the front side of the gas distribution ring through the high-fire gas supply cavity, meanwhile, the air blower is started, additional air is blown to the air blowing cavity through the air blowing box, and the additional air is forwards sent out through the air blowing and guiding channel; and a continuous, stable and high-speed'air curtain barrier 'is formed on the periphery of the outlet of the gas nozzle. The annular air curtain can resist external pressure fluctuation even if the blower operates at high power to generate strong wind.

The embodiment of the utility model discloses a cooking module and an integrated cooker, the cooking module comprises an inner container, a supporting piece and a sheet metal part, and the inner container is provided with a cooking cavity; the supporting piece is connected with the outer wall of the inner container. The sheet metal part is arranged outside the inner container in a surrounding mode and connected with the side, away from the inner container, of the supporting part. Wherein the sheet metal part and the outer wall of the inner container are encircled to form a heat insulation cavity to prevent heat in the cooking cavity from diffusing outwards, so that the probability of damage of the gas stove module and the control module can be reduced, the gas stove module and the control module can have longer service life, and the integrated stove can have longer service life.

The invention discloses a combustor and a stove. The burner includes: a base; the air distribution disc is arranged on the base and comprises an outer ring part and an inner ring part; the outer ring fire cover is arranged on the outer ring part, an outer ring gas mixing cavity is defined by the outer ring fire cover and the outer ring part, the outer ring fire cover is provided with a plurality of middle ring fire holes, the multiple middle ring fire holes are formed in the circumferential direction of the combustor at intervals, and the middle ring fire holes communicate with the outer ring gas mixing cavity; a plurality of flame stabilizing grooves communicating with the outer ring gas mixing cavity are formed in the surface, facing the central axis of the combustor, of the outer ring part, the flame stabilizing grooves are formed in the circumferential direction of the combustor at intervals, and the flame stabilizing grooves correspond to the middle ring fire holes in the direction parallel to the central axis of the combustor. According to the combustor, the flame stabilizing effect of middle ring fire can be improved, the combustion performance is improved, and the smoke concentration during combustion of the combustor is reduced.

The gas flameout protection device comprises an electromagnetic valve, the electromagnetic valve comprises a shell, a sealing gasket, a connecting shaft, an electromagnetic sheet and an electromagnet, and the electromagnetic sheet and the electromagnet are installed in the shell; the upper end of the connecting shaft is connected with the sealing gasket, and the lower end of the connecting shaft is connected with the electromagnetic sheet; the electromagnetic sheet and the electromagnet can be attracted; the lower end of the shell is connected with a valve seat, the valve seat is an integrated non-metal valve seat, and the electromagnet is connected with the upper end of the valve seat in a clamped mode. The valve seat is further provided with an outer connecting part used for being connected with a valve body of the gas valve. A coil is wound on the electromagnet, and a ground wire pin and a main wire pin of the coil extend outwards and are connected into the two connecting pins respectively. The cost can be greatly reduced, the assembling efficiency of the thermocouple and the electromagnetic valve can be improved, the assembling reliability between the electromagnet and the valve seat in the electromagnetic valve can be improved, and metal chippings are avoided.

The invention discloses a gas appliance and a control method thereof. The gas appliance comprises an ignition coil and a thermocouple. The combination valve is arranged on a gas pipeline of the gas appliance, is used for opening or cutting off the gas pipeline between the gas source and the gas appliance, and comprises a user end and a gas source end; the combination valve comprises an electromagnetic valve and a gas safety valve, the electromagnetic valve is arranged between the gas safety valve and the gas source end, and the electromagnetic valve is electrically connected with an ignition coil and a thermocouple. The problems that a self-closing valve of an existing gas appliance is low in sensitivity, and trace leakage cannot be detected are solved.

The invention belongs to the technical field of household gas stoves, and provides a household infrared stove with high heat intensity and a design method.The stove comprises a valve body and an infrared burner which are sequentially arranged in the airflow direction; according to the valve body, the two independent channels of the main fuel gas channel and the auxiliary fuel gas channel are matched with the main nozzle and the auxiliary nozzle to form a two-strand collision jet flow injection technology, an infrared injection pipe of the infrared burner and the main nozzle are coaxially arranged, and the infrared injection pipe and the auxiliary nozzle are of a non-coaxial structure, so that the injection capacity of the main nozzle is guaranteed, and the service life of the main nozzle is prolonged. The fuel gas injected by the auxiliary nozzle directly rushes to the inner wall of a shrinkage pipe in the infrared injection pipe, and the two jets are injected together; compared with a traditional single-nozzle ejection structure, the amount of ejected air is larger, gas and air are mixed more evenly, the ejection speed of the gas through fire holes of the infrared burner is higher, and the combustion stability is further enhanced in cooperation with the design of the infrared burner and the infrared radiation combustion plate.

The invention discloses a gas cooker which comprises a combustor and an ejector, the combustor is provided with a premixing cavity, the premixing cavity is communicated with external gas supply through the ejector, a fire cover is arranged on the premixing cavity in a covering mode, the gas cooker is characterized by further comprising an energy gathering disc, a mounting opening is formed in the middle of the energy gathering disc, and the energy gathering disc is provided with a gas inlet and a gas outlet. The combustor is arranged at the position of the mounting opening in a penetrating mode, and a heat insulation cavity and a preheating cavity are sequentially defined by the energy gathering disc from top to bottom; the air outlet end of the air blower is communicated with the air inlet end of the preheating cavity; the nozzle seat is arranged on the ejector, a gas distribution channel is limited in the nozzle, one end of the gas distribution channel is communicated with the gas outlet end of the preheating cavity, and the other end of the gas distribution channel is communicated with the ejector. The energy-saving stove is simple in structure, heat emitted downwards can be fully utilized, and meanwhile the energy efficiency of the stove is effectively improved.

An oven is provided, which includes a domed ceiling, a baking stone located below the domed ceiling, a cooking chamber between the domed ceiling and the baking stone, a front opening that provides access to the cooking chamber for food and utensils, a combustion chamber adjacent to, and at least partially below, the cooking chamber, and a rear opening that provides access to the combustion chamber.

An oven 310 comprises an oven chamber 370, a port 350 for a demountable heated air source at a rear of the oven, and a flue 330 from the oven chamber. A first heated air source comprising a gas burner (380, figure 5B) and a variable air inlet 346 for use with a second heated air source which comprises a solid fuel carrier 340 may each be demountably receivable by the port, where only the variable air inlet or the first heated air source can be received by the port at the same time. An air flow director 374 may have an upper portion extending downwards, a rear surface that faces the rear of the oven, and a lower portion which directs air flowing down the rear surface more rearwardly, where the air flow director deflects heated air away from the flue and downwards towards the cooking surface. The flue may comprise a valve configured such that, when in a closed position, an open cross-sectional area of the flue through which air can flow out of the oven is at least 25% of the open cross-sectional area of the flue when the valve is in an open position.

The invention provides a plug valve and belongs to the technical field of kitchen appliances, the plug valve comprises a valve body, a valve core, a valve rod and a delay mechanism, the valve body comprises a valve body, an outer ring air outlet assembly and an inner ring air outlet assembly, and the valve core comprises a valve core cavity, an outer ring air outlet hole, an air inlet hole and an inner ring air outlet hole, the outer ring air outlet assembly is provided with an outer ring channel and a stir-frying channel connected to the outer ring channel, and the inner ring air outlet assembly is provided with an inner ring channel; the air inlet hole is communicated with the outer ring air outlet hole to form a first air outlet channel communicated with the outer ring channel, and the air inlet hole is communicated with the inner ring air outlet hole to form a second air outlet channel communicated with the inner ring channel; the delay mechanism is inserted into the valve element cavity and can abut against the valve rod which is configured to be in a downward pressing state, and the delay mechanism can ascend and descend along with the valve rod so as to connect or disconnect the first air outlet channel and the outer ring channel. The gas outlet of the outer ring can be delayed, ignition deflagration is prevented, and the product safety performance and the user experience are effectively improved.

The invention relates to a gas stove control device with a fault detection function and a gas stove. The gas stove control device comprises a double-coil electromagnetic valve, a driving circuit, a detection circuit, a controller and an alarm. A main coil of the double-coil electromagnetic valve is connected with a thermocouple, a secondary coil of the double-coil electromagnetic valve is connected with the driving circuit, and the driving circuit is used for outputting driving current to the secondary coil; the detection circuit is connected with two ends of the secondary coil and is used for detecting voltages at two ends of the secondary coil; the controller is connected with the drive circuit, the detection circuit and the alarm and used for controlling on-off of the drive circuit and controlling the alarm to give an alarm according to the voltage, fed back by the detection circuit, of the two ends of the secondary coil. According to the invention, various faults such as open circuit, short circuit and turn-to-turn short circuit of the secondary coil are accurately identified based on the voltages at the two ends of the secondary coil, the alarm gives an alarm to remind a user in time when the fault of the secondary coil is detected, the sensitivity and accuracy of fault detection of the secondary coil are high, and the safety performance is high.

An oven includes upper and lower assemblies, a fire box and a heat absorbing and emanating device. The upper assembly forms a cooking chamber and has a front side with an open entry to the cooking chamber. The lower assembly is located below the upper assembly and has an internal cavity. The fire box is located within the internal cavity and includes a heat source. The device is located between the upper and lower assemblies and absorbs heat from the heat source and emanates heat into the cooking chamber of the upper assembly. The upper assembly includes inner and outer dome assemblies. The inner dome is located within the outer dome and forms first and second airflow pathways.