107results about How to "Control opening" patented technology

The invention relates to cementing equipment and mixing equipment for oil and gas field and provides a clear water controlling device for a high-energy mixer and the high-energy mixer. The clear water controlling device comprises a soleplate, a linear actuator, a hinge shaft, a rocking arm, a leading screw, a manual rocking handle, a thread spindle and a valve rod, and is characterized in that the soleplate is hinged with a mounting base of the linear actuator; the hinge shaft is inserted in a central shaft hole of the soleplate; one end of the leading screw is fixed on the hinge shaft; the central portion of the leading screw forms a sleeve joint with the thread spindle, which is inserted in a central hole of the rocking arm; the upper end of the rocking arm is hinged with the valve rod; the lower end of the rocking arm is hinged with a push rod of the linear actuator; a through hole is arranged at the junction of the thread spindle and the leading screw; and a pin is disposed inside the trough hole. According to the invention, automatic and accurate control of the valve rod feed can be conveniently realized such that the slurry mixing effect of the high-energy mixer is more excellent than that in the prior art and the high-energy mixer can be used in both automatic and manual modes.

To provide a well controllable vacuum pressure regulating valve with a valve member whose opening is quickly and accurately controlled by a small and inexpensive electric motor. The vacuum valve regulating valve comprises a valve main part 1 using a valve member 15 for opening / closing a valve seat 14 between main ports 11, 12, a cylinder part 2 having a piston 32 for opening / closing operation of the valve member, a valve opening adjusting part 3 using a stopper 41 to be driven by the electric motor 45 for setting the opening of the valve member, and a valve control part 4 for controlling the opening of the valve member in accordance with the output of a pressure sensor 60 in a vacuum chamber. The valve control part has a main controller 63 for outputting a signal which determines the opening of the valve member, to a motor controller 64 which controls the electric motor 45, in accordance with a signal for a pressure set value and a pressure signal from the pressure sensor and for controlling the supply of pilot fluid to a pressure chamber 37 of the piston to move the piston 32 to a position where it abuts on the stopper.

The invention discloses a lifting stationarity control system and a mining dump truck and belongs to the field of mechanical control. The Lifting stationarity control system comprises a truck bed 1, a frame 2, a lifting mechanism 3, a controller 4, and an angular displacement sensor 5, wherein the truck bed 1 is hinged to the frame 2; the lifting mechanism 3 can extend and contract to drive the truck bed 1 to ascend or descend relative to the frame 2; the controller 4 is connected with the lifting mechanism 3; the angular displacement sensor 5 is arranged on the truck bed 1 and the frame 2 and is connected with the controller 4; the angular displacement sensor 5 is used for detecting an angular displacement signal of the truck bed 1 relative to the frame 2 and transmitting the signal to the controller 4; and the controller 4 is used for controlling the movement velocity of the truck bed 1 through the lifting mechanism 3 according to the signal. According to the technical scheme of the invention, angle valves collected by the angular displacement sensor are used as controller input signals and signal acquisition section is wide, so that the defects that the rotation angle of an electronic control handle is small and the controllability of a value element is bad are avoided, the effects of throttling and buffering are realized, and the service life of parts is prolonged.

The invention relates to an intelligent sintering mixed water adding control method with a prediction function. Different control modes are used for primary mixing and secondary mixing. The primary mixing uses a feed-forward control mode with an identification and prediction function, and the secondary mixing uses a feed-forward feedback composite control mode. The method has the advantages that controllers are designed according to respective characteristics of the primary mixing and the secondary mixing of sintering; during the primary mixing, system interference is reduced, and the control accuracy is increased through the identification of the water content before mixing, and during the secondary mixing, and water adding control is stable through feed-forward feedback composite control. The method is high in applicability and transportability and can be widely applied to sintering production lines.

The invention provides a controlling method and a controlling device for a variable-frequency air conditioner. The variable-frequency air conditioner comprises a compressor and an electronic expansion valve for adjusting the coolant flow. The controlling method for the variable-frequency air conditioner comprises the steps of detecting the operation frequency of the compressor; judging whether the operation frequency of the compressor is smaller than or equal to a preset frequency value; and controlling the openness of the electronic expansion valve to be increased when the operation frequency of the compressor is smaller than or equal to the preset frequency value to control the variable-frequency air conditioner to be in a low-frequency stable operation mode. By means of the technical scheme, the stability of the variable-frequency air conditioner in low-frequency operation is improved, zero fluctuation or smaller fluctuation of indoor temperature is guaranteed, and the user comfortableness is improved.

The invention discloses a method for controlling an indoor machine during the heating of a multi-connected central air conditioner, which comprises a starting and heating stage, a detection stage, an operation stage and a stopping stage. After heating, the exhaust temperature of a compressor of an outdoor machine is detected, and when the exhaust temperature of the compressor is smaller than a first set value, an electronic expansion valve is opened for a normal opening; when the exhaust temperature of the compressor is larger than the first set valve, an indoor electronic expansion valve without participating in the heating is controlled to open from the normal opening up to an opening of 130 degrees; the exhaust temperature of the compressor is detected again, and when the exhaust temperature of the compressor is smaller than a second set value, the electronic expansion valve is opened to the normal opening; and when the exhaust temperature of the compressor is larger than the second set value, the indoor electronic expansion valve is opened within the range of the normal opening. The method has the advantages that the opening of the indoor electronic expansion valve is controlled by detecting the exhaust temperature of the compressor so as to effectively restrain cooling media from accumulating in the indoor machine which is not operated and ensure that the air conditioner is operated with high performance, thus the heating efficiency can be greatly improved.

The invention relates to a positive pressure humidification oxygen therapy instrument and an application method thereof. The oxygen therapy instrument includes a controller, a draught fan, an electric control valve, an air mixer, a flow sensor, an oxygen concentration sensor and an air humidification mechanism and a reheating mechanism; an air filter is arranged on an air inlet of the draught fan, and an air outlet of the draught fan is connected with anairsupply pipeline; one end of the electric control valve is connected with an external oxygen source, and the other end of the electric control valve is connected with an oxygen supply pipeline; the inlet of the air mixer is connected with the air supply pipeline and the oxygen supply pipeline respectively, and the outlet of the air mixer is connected with anair mixture supply pipeline; the flow sensor and the oxygen concentration sensor are arranged on the air mixture supply pipeline; the air humidification mechanism injects water vapor into the air mixture supply pipeline to increase the humidity of the air mixture supply pipeline, and reheating is conducted on the airmixture supply pipeline through the reheating mechanism. According to the positive pressure humidification oxygen therapy instrument,the air mixture supplemented with oxygen can be provided, and humidification can be conducted on the air mixer, so that the oxygen therapy instrument has a better use effect.

Present invention relates to a electronic expansion valve suitable for frequency conversion air conditioner, commercial air conditioner, minitype central air conditioning, chilled food display case and constant temperature and humidity equipment etc, belonging to air conditioning and refrigerating technology field. It contains repeating motor, speed reducing gear, valve body, and shell. Said stepping motor drives underdriving gear set for transferring power, combined with corrugated pipe to make adjustments to valve needle lift range. The decelerating effect of Underdriving gear set increases output torque to obtain large enough output torque by using smaller electromagnetic force, to satisfy large caliber and novel refrigerant requirement.

The invention relates to the technical field of domestic articles for daily use and particularly relates to a showering device. The showering device provided by the invention comprises a cold water pipe, a hot water pipe, a mixer and a controller, wherein the hot water pipe and the cold water pipe are communicated with the mixer respectively; cold water and hot water are mixed in the mixer; the controller can be used for comparing the temperature of a water outlet, detected by a temperature detection mechanism, with a pre-set temperature, adjusting the opening degrees of the hot water pipe and the cold water pipe according to a comparing result, and adjusting the ratio of the hot water to the cold water in the mixer so as to automatically correct the temperature; and the temperature of a water outlet is adjusted in real time so that the temperature of the water outlet is consistent to the temperature adjusted by a user, and a water outlet temperature of the showering device is relatively accurate; and meanwhile the hot water entering from the hot water pipe and the cold water entering from the cold water pipe are sufficiently and rapidly mixed and stirred in a stirrer, so that the heat of the hot water and the cold water can be rapidly exchanged, and a condition that water is sometimes hot and sometimes cold is avoided.

A pneumatic valve control mechanism is characterized by comprising a guide arm, a drive air cylinder and a magnetic reversing valve. An air inlet of the magnetic reversing valve is used for compressed air to be fed, and an air outlet is connected with an air inlet of the drive air cylinder. One end of the guide arm is connected with a valve element drive shaft of the valve, the guide arm can rotate around the valve element drive shaft of the valve and is provided with a chute, a slide shaft is installed in the chute, and the slide shaft is connected with a piston rod of the drive air cylinder to jointly form a connecting rod mechanism. The reciprocating motion of the piston rod drives the slide shaft to slide in the chute of the guide arm so as to form the connecting rod motion mechanism, the guide arm is driven to perform reciprocating rotation around the valve element drive shaft of the valve and further open or close the valve, and remote control of the valve is achieved through the magnetic reversing valve. On the basis, the position required to be reached, of the piston rod can be calculated according to the opening degree of the valve, then the position of a proximity switch sensing end on the drive air cylinder is adjusted, and accordingly accurate positioning during valve opening is achieved.

The invention relates to a ventilating method and a ventilating device for a building and is characterized in that a wind speed monitoring mechanism is arranged at the highest roof of a building and a position above the highest roof, the wind speed monitoring mechanism is electrically connected with an electric window and an automatic control system of the building, and the automatic control system of the building is used for controlling the wind speed monitoring mechanism and the electric window, so as to realize linkage of the wind speed monitoring mechanism and the electric window; by monitoring the change conditions of natural wind and adapting to the change of the natural wind, the resistance distribution of a resistance part on a ventilating path of the building can be changed; and a control signal produced by the control system is output to a control end of the electric outer window to form a regulation structure for leading the natural wind into the room of the building, so as to change the resistance distribution of the resistance part on the ventilating path of the building. The method and the device have the benefits of being convenient to control, simple in structure and capable of ensuring reasonable indoor natural ventilation.

The invention discloses a new-energy cold and heat air exchange system of an air conditioner for an automobile, which comprises an evaporator (2), a condenser (9), an electric compressor (11) and a dry liquid storage tank (30) connected through a pipeline 1 (5) to form a closed system, arranged in a box body and controlled by an electronic control system, wherein the front part of the box body is provided with an evaporation case (17); the rear part of the box body is provided with a condensing case (16); and the middle part of the box body is provided with the electronic control system. The new-energy cold and heat air exchange system is characterized in that the refrigeration process is that a refrigerant is gasified by the evaporator (2), then enters the electric compressor (11), the condenser (9), and the dry liquid storage tank (30) and enter the evaporator (2) again to disperse the cold air into inside of a compartment, so that the refrigeration is finished. In the whole circulating process, the electric compressor plays a role of compressing and delivering steam of the refrigerant; the electronic digital control panel computes according to parameters of each sensor through a mathematical model and experiential data, accurately controls the rotation speed of the electric compressor, the opening degree of an electronic expansion valve and reasonable air quantity of a fan, so that the system is kept at the best working state.

The invention discloses a novel abdominal retractor for surgery, and relates to the technical field of abdominal retractors. The novel abdominal retractor comprises a bottom plate, wherein the top ofthe bottom plate is fixedly connected with a stand column, the top end of the stand column is rotatably connected with a threaded column, the threaded column is in threaded connection with a threadedbushing, the side wall of the threaded bushing is fixedly connected with a supporting column, a sliding column is arranged at one end of the supporting column, and an annular rod is arranged at one end of the sliding column. According to the invention, the novel abdominal retractor is reasonable in structure; by arranging the sliding block, the U-shaped pressing plate, the butterfly nut, the threaded rod and the annular rod, the positions of the sliding block and the sliding plate can be adjusted conveniently according to the position of a knife edge, and position fixing is conducted through the U-shaped pressing plate, so that operation is convenient and easy; and by arranging the gear and the rack, force can be conveniently controlled, and the opening degree of the traction knife edge ofthe traction plate is conveniently controlled, so that unnecessary injury to the patient caused by further expanding of the incision of the patient due to direct manual sliding of the traction plateis avoided.

A cold-warm air exchange system based on high-efficiency motor driving for an automobile comprises an electric compressor, a condenser, a condensing blower, an expansion valve, an evaporator, an evaporator blower as well as an electronic control system, which are connected with one another by pipelines to form a closed system, and is characterized in that after finishing the heat exchange with air inside a carriage, a refrigerant in the evaporator is gasified to low-temperature and low-pressure steam to firstly enter the electric compressor and then enter the evaporator to absorb heat quantity of objects around the evaporator so as to enable the temperature of the evaporator to be lowered, and used for completing the refrigeration cycle in cycles. According to the invention, the condenser and the evaporator are used as heat exchange equipment of the system, and used for outputting the heat quantity from the system and inputting the heat quantity to the system. The electronic control system is used for calculating based on parameters (temperature, pressure, and the like) of all sensors by a mathematical model and empirical data to precisely control the rotation speed of the electric compressor, the opening degree of an electronic expansion valve and reasonable wind amount of the blowers so as to enable the system to remain the best working condition.

The invention discloses a method for controlling an electronic expansion valve of a trans-critical carbon dioxide heat pump system. The method includes the following steps that first, an exhaust pressure value is collected; second, water route control parameters are determined; third, the optimal exhaust pressure of the trans-critical carbon dioxide heat pump system is confirmed; fourth, the exhaust pressure is adjusted; fifth, the COP in the steady state of the system is calculated; and sixth, the optimal exhaust pressure is verified through particle swarm optimization (PSO). By adoption of the method, the exhaust pressure can be controlled through matching of opening degree adjustment of the electronic expansion valve and exhaust temperature variation, the sampling speed is high, precision is also high, time delay is small, robustness is high, and the defect of liquid return hidden danger caused by avoidance of the excessively-high exhaust temperature of a compressor in a traditionalexhaust temperate control method is overcome. According to the method, pressure control can be conducted on refrigerating systems like the trans-critical carbon dioxide heat pump system with strong nonlinear characteristics, and higher adjustment control capacity can be achieved when the trans-critical carbon dioxide heat pump system operates under different working conditions.

The invention discloses an air conditioner only having a refrigeration function and a control method thereof. The air conditioner only having the refrigeration function comprises a double-cylinder compressor, an outdoor heat exchanger, an indoor heat exchanger, an air-liquid separator and a refrigerant heat sink; an air suction port of a first air cylinder is communicated with a first liquid storage device; the exhaust volume ratio of a second air cylinder to the first air cylinder ranges from 1% to 10%; the air-liquid separator comprises an air outlet, a first interface and a second interface; the air outlet is connected to the second air cylinder; a first throttling element with the fixed opening is connected between the first interface and the outdoor heat exchanger in series; and a second throttling element with an adjustable opening is connected between the second interface and the indoor heat exchanger in series; and the refrigerant heat sink is connected between the outdoor heat exchanger and the first throttling element in series. The energy efficiency of the air conditioner only having the refrigeration function is effectively improved.

The invention discloses a multi-connected type fresh air system and a control method thereof. The multi-connected type fresh air system comprises an outdoor unit, a fresh air ventilator, at least oneindoor unit, a first temperature detecting module, a second temperature detecting module and a control module, wherein the fresh air ventilator communicates to the outdoor side through an air tube; the at least one indoor unit and the fresh air ventilator are in parallel connected to the outdoor unit; the first temperature detecting module and the second temperature detecting module are separatelyused for detecting an air supply temperature of the fresh air ventilator and the indoor environment temperature corresponding to each operation indoor unit; the control module is used for obtaining atemperature difference value delta T1 between the indoor environment temperature corresponding to each operation indoor unit and a set temperature when the fresh air ventilator and the at least one indoor unit simultaneously operate, obtaining a temperature difference value delta T2 between the air supply temperature and the set temperature of the fresh air ventilator, and controlling the air outlet amount and the refrigerant amount of the fresh air ventilator and each operation indoor unit according to the temperature difference value delta T1 and the temperature difference value delta T2. Therefore, the multi-connected type fresh air system can control the air outlet amount and the refrigerant amount of the fresh air ventilator and each operation indoor unit, so that the refrigerating and heating effects of each operation indoor unit are improved, and user experience is improved.

The invention discloses an efficient energy-saving information equipment cabinet. The cabinet comprises a cabinet body, an equipment rack mounted in the middle of the cabinet body, and a cold air supply channel and a hot air discharge channel formed in the cabinet body and located on the two sides of the equipment rack; a plurality of air inlets with adjustable opening degrees are formed in a sidewall of the cold air supply channel in a height direction of the equipment rack; the cold air supply channel is divided into an upper cold air supply unit and a lower cold air supply unit which are independent of each other through a transversely arranged partition plate; the partition plate can slide in the height direction of the equipment rack; the cabinet further comprises a variable-frequency air conditioning unit communicating with the air inlets; and cold air discharged from the variable-frequency air conditioning unit enters the cold air supply channel from the air inlets and then isdischarged from the hot air discharge channel through the equipment rack. According to the cabinet, information equipment can be rapidly and accurately refrigerated, so that the cooling energy of an information system is saved, and the cost of a user is reduced.

The invention discloses a control method and device of an air conditioner and the air conditioner. The control method of the air conditioner comprises the following steps that in a refrigeration mode,the indoor temperature value and the working frequency of the air conditioner are detected in real time; when the indoor temperature value meets the first preset condition, the working frequency of the air conditioner is the minimum frequency, and when the first preset condition reaches the first preset duration, the working frequency of the air conditioner reach the minimum frequency, and the air conditioner is controlled to stop running; the indoor temperature value is detected; and when the indoor temperature value meets the second preset condition and the second preset condition reaches the second preset duration, the air conditioner is controlled to be started again, and the working frequency of the air conditioner is the frequency after compensation for the minimum frequency after the operation is restarted. According to the control method and device of the air conditioner and the air conditioner, frequent starting and closing of the air conditioner can be effectively avoided, the service life of the air conditioner is prolonged, the indoor temperature is prevented from being frequently fluctuated, and the comfort is improved.

The invention discloses a cold-warm air interchange system of a vehicle air conditioner. The cold-warm air interchange system comprises an electrically driven compressor, a condenser, a condensation fan, an expansion valve, an evaporator, an evaporation fan and an electronic control system which are connected by a pipeline to be a seal system, wherein the heating is achieved by using the electronic control system to control a four-way valve and an unilateral electromagnetic valve, exchanging the functions of the condenser and the evaporator, and using a heating pump theory to heat, and further adding PTC (phenylthiocarbamide) to heat and compensate in high cold climate. According to the cold-warm air interchange system, the electrically driven compressor plays roles of compressing and transporting refrigerant steam; the electronic control system is used for calculating by a mathematical model and experience data according to the parameters of each sensor (temperature, pressure and so on), to accurately control the rotation speed of the electrically driven compressor, the opening degree of the electronic expansion valve and the reasonable air volume of the fan, so that the optimal work state of the system is kept all the time.

The invention proposes an openness control method of a throttle valve, an openness control device of the throttle valve and an air conditioner. The openness control method of the throttle valve comprises the steps of: detecting present environment parameters of the air conditioner; and controlling a real-time openness of the throttle valve of the air conditioner according to the present environment parameters and / or different preset working condition parameters. The openness control method of the throttle valve can preferably control the openness of the throttle valve of the air conditioner, so that the air conditioner exerts optimal capacity and energy efficiency, and can stably and reliably operate under a higher environmental temperature to satisfy the requirements of users on ultrahigh energy efficiency and a ultrahigh pressure system.

The invention discloses a single-cold type air conditioner and a control method thereof. The single-cold type air conditioner comprises a two-cylinder compressor, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator and a refrigerant cooler, wherein an air suction port of a first air cylinder communicates with a first liquid accumulator; the value range of the exhaust volume ratio of a second air cylinder to the first air cylinder is 1 to 10 percent; the gas-liquid separator comprises a gas outlet, a first interface and a second interface; the gas outlet is connected with the second air cylinder; a first throttling element with an adjustable opening degree is connected between the first interface and the outdoor heat exchanger in series; a second throttling element with a fixed opening degree is connected between the second interface and the indoor heat exchanger in series; and the refrigerant cooler is connected between the gas outlet and an air suction port of the second air cylinder in series. According to the single-cold type air conditioner disclosed by the invention, the energy efficiency of the air conditioner is effectively improved.

The invention relates to a control method for emptying air in an underground filling riser by using a cut-off valve. The control method comprises a hydraulic pump station, the cut-off valve, a displacement sensor and a PLC (Programmable Logic Controller) control system, and is characterized in that the PLC control system is connected with the hydraulic pump station and the cut-off valve through control cables respectively, wherein the hydraulic pump station is connected with the cut-off valve through an oil pipe; a real-time numerical value is transferred to the PLC control system by the displacement sensor which is placed on the cut-off valve through an analog module; and the size of the opening of the cut-off valve is controlled by the PLC control system according to the real-time numerical value transferred by the displacement sensor to empty the air in the underground filling riser. The cut-off valve is hydraulically controlled and the size of the opening of the valve is accurately measured through the displacement sensor, and then the specific opening of the valve is controlled by the PLC control system to facilitate emptying of the air in the underground filling riser.

The invention provides a control method for an engine cooling system. The control method for the engine cooling system includes the following steps that the temperature distribution of all test pointswhen an engine is in the best state under different work conditions is calibrated and made into a MAP chart to be stored in an engine management system; the relationship of the inlet temperature andoutlet temperature of engine cooling liquid and the temperature of all the test points of the engine under a certain work condition is calibrated and made into a MAP chart to be stored in the engine management system; the relationship of the power of an electric fan, the opening degree of a thermostat, and the inlet temperature and outlet temperature of engine cooling liquid under the same work condition is calibrated and made into a MAP chart to be stored in the engine management system; the engine management system builds intelligent cooling control strategies under different work conditionsaccording to the stored MAP charts; and the engine management system controls the inlet temperature and outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to the intelligent cooling control strategies. The control method for the engine cooling system can lower the temperature distribution and water temperature fluctuation of all the test points of the engine.

The invention discloses an air conditioner only having a refrigeration function and a control method thereof. The air conditioner only having the refrigeration function comprises a double-cylinder compressor, an outdoor heat exchanger, an indoor heat exchanger, an air-liquid separator and a refrigerant heat sink; an air suction port of a first air cylinder is communicated with a first liquid storage device; the exhaust volume ratio of a second air cylinder to the first air cylinder ranges from 1% to 10%; the air-liquid separator comprises an air outlet, a first interface and a second interface; the air outlet is connected to the second air cylinder; a first throttling element with an adjustable opening is connected between the first interface and the outdoor heat exchanger in series; and a second throttling element with a fixed opening is connected between the second interface and the indoor heat exchanger in series; and the refrigerant heat sink is connected between the first throttling element and the first interface in series or is connected between the second throttling element and the second interface in series. The energy efficiency of the air conditioner only having the refrigeration function is effectively improved.

The invention provides a mandrel heat preservation device and a mandrel temperature adjustment system and relates to the technical field of seamless steel tubes. The mandrel heat preservation device comprises a swing beam and a sealed furnace body, and the swing beam is arranged in the furnace body in a penetrating manner. The swing beam is provided with mandrels, the furnace body is provided withburners corresponding to the mandrels, smoke is introduced into the burners, and the furnace body is provided with a flue for discharging the smoke. According to the mandrel heat preservation device,heating is performed through the smoke, and the condition of a local high-temperature of a flame is avoided; and the mandrels are located in the sealed furnace body, heating uniformity can be guaranteed, the smoke can be discharged through the flue and cannot pollute air, and the mandrel heat preservation device and the mandrel temperature adjustment system have the advantages of being uniform inheating, environmentally friendly and the like.

A detection system suitable for a pressure regulator in front of a gas indoor meter comprises a gas supply system, an experiment gas conveying pipeline, a control pipeline, a telescopic clamp system,an industrial personal computer, a primary pressure control device and a secondary pressure control device. The telescopic clamp system comprises an exhaust ball valve, a telescopic pipe, a tested pressure regulator and a flow controller which are connected in sequence. The primary pressure control device comprises a primary pressure regulating electric proportional pressure regulating valve and aprimary main body throttling device; the secondary pressure control device comprises a secondary pressure regulating electric proportional pressure regulating valve, a secondary main body throttlingdevice and a bypass pipeline; the industrial personal computer is connected with the primary pressure regulating proportional regulating valve and the secondary proportional regulating valve through an analog quantity output module and a data / signal transmission line, so analog signal transmission is achieved, and the regulating valves are controlled according to the analog quantity so as to control output air pressure signals. The system is large in flow regulation range, high in pressure control precision, small in minimum flow, convenient to install and capable of integrating air supply, pressure regulation and display.

The invention discloses an air door adjusting device and a gas stove. The air door adjusting device comprises a driving motor, and an air door module is in gear connection with the driving motor; andthe driving motor drives the openness of the air door module through gear transmission to adjust the air feeding quantity. Through adjustment of the openness of the air door module through gear transmission, the openness adjustment of the air door is more precise, the mixing ratio of gas of the gas stove and air is more reasonable, and the combustion efficiency of the gas is improved.