169 results about "Pressure Limit Valve" patented technology

The invention belongs to the technical field of lubricating oil processing, and particularly relates to lubricating oil hydrofining equipment which comprises a high-pressure tank, a high-pressure pump, an oil inlet pipe and a hydrogen inlet pipe. The output end of the oil inlet pipe and the output end of the hydrogen inlet pipe are both located on the lower portion of a hydrogenation cavity of the high-pressure tank, the spiral plate is installed in the middle of the hydrogenation cavity of the high-pressure tank, a hydrogenation catalyst is arranged on the surface of the spiral plate, and the permeable membrane separation barrel is installed on the upper portion of the hydrogenation cavity of the high-pressure tank; a permeable membrane for hydrogen and waste gas to enter is arranged on the outer wall of the permeable membrane separation barrel, the input end of the exhaust pipe extends into the permeable membrane separation barrel, the output end of the exhaust pipe is connected with the sucking pump, the input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and the output end of the oil outlet pipe is provided with a pressure limiting valve; hydrogenation mixing, hydrogenation refining and oil-gas separation are carried out in a high-temperature and high-pressure tank body, the integration level is high, the energy consumption is low, and the refining efficiency is high.

A trailer control valve for controlling a hydraulic dual-line brake system of a trailer vehicle has an inlet for a hydraulic supply line of the towing vehicle, a tank outlet for an unpressurized return-flow line of the towing vehicle, a brake pressure outlet, and a supplemental pressure outlet. The brake pressure outlet can be connected in a stepped manner with an electronically controlled brake control valve to the supply pressure inlet or to the tank outlet. The supplemental pressure outlet can connect using a valve arrangement so that an outlet pressure of the supply pressure is reduced to a supplemental pressure at the supply pressure inlet or at the tank outlet. The valve arrangement has a pressure-limiting valve and a shut-off valve arranged in series. The shut-off valve can be a 3 / 2-way valve, which when not energized, the supplemental pressure outlet is connected to the tank outlet.

The application provides a cooking utensil, comprising: a utensil body having a cooking cavity; a cover body which is arranged on the utensil body and comprises a locked position locked on the utensil body and an unlocked position not locked on the utensil body, the cover body is provided with an exhaust passage communicated with the cooking cavity; a handle arranged on the cover body, the handle drives the cover body to rotate between the locked position and the unlocked position; a pressure limiting valve which blocks an exhaust port of the exhaust passage when the cover body is in the locked position; and a driving structure which drives the pressure limiting valve away from the exhaust port when the cover body is in the unlocked position. The technical scheme of the application can effectively solve the problem of poor safety of the cooking utensil in the related art.

The present application relates to the technical field of microneedle transdermal drug delivery, and particularly relates to a transdermal drug delivery patch and a penetration promoting patch assembly. The transdermal drug delivery patch comprises a driving device, the driving device comprises an elastic air bag, a pressure generating unit and a pressure limiting valve, the pressure generating unit is connected with the elastic air bag, is used for increasing the internal air pressure of the elastic air bag and making the elastic air bag expand, the pressure limiting valve is arranged on the elastic air bag, and is opened only when the air pressure in the elastic air bag exceeds a threshold value, is used for reducing the internal air pressure of the elastic air bag and making the elastic air bag shrink; the patch further comprises a dredging device, the dredging device comprises a substrate, one side surface of the substrate is in contact with the elastic air bag, and a dredging unit capable of treating the skin is arranged on the other side surface of the substrate; the dredging unit can repeatedly touch the skin in the process that the elastic air bag repeatedly expands and shrinks. The present application can effectively improve the absorption effect of the skin on active ingredients, and simultaneously reduce the operation and learning difficulty.

This application discloses an air suspension control system with a load connector, relating to the field of air suspension technology. By adding an external load interface and controlling the opening and closing of the air circuit through an electronically controlled pressure-limiting valve, it is possible to inflate an external load. The air suspension control system includes: an air supply valve unit, an air silencer filter dryer, an air tank, and multiple air springs. The air supply valve unit includes a manual vent bolt, an electronically controlled pressure-limiting valve, and a dryer tank. The air supply valve unit is equipped with a first air inlet, a second air inlet, a third air inlet, a fourth air inlet, and multiple fifth air inlets. The manual vent bolt is connected to the first air inlet, the electronically controlled pressure-limiting valve is connected to the second air inlet, and the dryer tank is connected to the third air inlet. The air inlet and outlet of the air silencer filter dryer are connected to the fourth air inlet. The air tank is connected to the dryer tank through the third air inlet. Each of the multiple air springs is connected to one of the multiple fifth air inlets.

The invention discloses a coal mine two-lane hydraulic support anti-impact stand column and a multi-stage pressure relief method of the coal mine two-lane hydraulic support anti-impact stand column. The anti-impact stand column comprises a first-stage cylinder, a second-stage cylinder, a movable column and an inner leakage plane pressure limiting valve. The first-stage cylinder is divided into two cavities by a valve seat plate arranged in the first-stage cylinder; a valve port is formed in the middle area of the valve seat plate; the inner leakage plane pressure limiting valve comprises a pressure limiting valve piston, a valve element and a first-stage elastic element. The pressure-limiting valve piston is connected with the inner wall of the upper cavity in a movable sealing fit manner, and a plurality of damping holes are formed in the pressure-limiting valve piston; the upper end of the valve core is connected with the pressure-limiting valve piston, and the lower end extends out of the valve port of the valve seat plate and closes / opens the valve port; the two ends of the first-stage elastic element make contact with the pressure limiting valve piston and the valve seat plate respectively. The cavity wall of the cavity C is provided with an upper cavity pressure relief opening, and the cavity B is provided with a lower cavity pressure relief opening. By assembling the internal leakage plane pressure limiting valve in the first-stage cylinder, the problems that an existing hydraulic support stand column is low in pressure relief response speed, seriously insufficient in pressure relief capacity and the like are solved.

A pressure limiting valve of a pressure cooker comprises an outer valve body and an inner valve body, the outer valve body comprises a first valve sleeve made of plastic and a second valve sleeve which is located in the first valve sleeve and made of metal, and the first valve sleeve and the second valve sleeve are integrated; a plurality of protruding adjusting feet are evenly distributed on the outer side face of the first valve sleeve and extend downwards to exceed the lower end face of the first valve sleeve. The inner valve body comprises a metal third valve sleeve sleeved in the second valve sleeve, the upper end of the third valve sleeve is provided with a plastic bonnet which is integrated with the third valve sleeve, the diameter of the bonnet is larger than that of the third valve sleeve, the bonnet is provided with an exhaust hole communicated with an inner cavity of the third valve sleeve, the back face of the bonnet is further provided with a sealing piece, and the sealing piece extends into the inner cavity of the third valve sleeve; the valve bonnet is located above the first valve sleeve and the second valve sleeve, an anti-disengaging clamping ring is arranged on the lower portion of the outer side face of the third valve sleeve, a step is formed by a concave portion of the lower portion of the inner side wall of the second valve sleeve, and the step of the second valve sleeve abuts against the anti-disengaging clamping ring in the free state.

The invention provides an independent modular structure of a railway wagon braking system and a mounting method, and belongs to the technical field of braking systems, the independent modular structure comprises a bottom plate, a 120 valve, an auxiliary air cylinder, a double-chamber air cylinder, a pressure limiting valve, a pneumatic passage device and a plurality of pipelines; the 120 valve, the auxiliary air cylinder, the double-chamber air cylinder, the pressure limiting valve and the pneumatic passage device are all installed on the bottom plate, and the pneumatic passage device is provided with two ventilation cavities, a penetrating channel and four connecting holes. The pressure limiting valve and the pneumatic passage device are fixedly installed, and the pressure limiting valve is communicated with one connecting hole and one end of the penetrating channel. The 120 valve is connected with the auxiliary air cylinder and the double-chamber air cylinder through pipelines, the 120 valve and the double-chamber air cylinder are communicated with one connecting hole and one penetrating channel through pipelines, and the 120 valve and the pressure limiting valve are communicated with the same ventilation cavity. According to the independent modular structure of the railway wagon braking system, multiple components are integrally arranged, pipeline cross interference and pipeline connecting length are reduced, and the response speed of the braking system is increased.

The present invention provides a commercial vehicle brake pedal force control system and vehicle, belonging to the field of vehicle development technology. The system includes: a brake pedal, a brake valve push rod, a brake valve, a rear air reservoir, a front air reservoir, a front circuit pressure-limiting valve, a rear circuit pressure-limiting valve, a front axle relay valve, and a rear axle relay valve. Compressed air in the front air reservoir enters the brake valve through the front circuit pressure-limiting valve and a first air inlet; compressed air in the rear air reservoir enters the brake valve through the rear circuit pressure-limiting valve and a second air inlet. When the brake pedal is depressed, the brake valve push rod moves, and the compressed air in the brake valve is discharged through the first and second air outlets to the rear axle relay valve and the front axle relay valve. When the brake pedal is returned, the brake valve push rod returns, and the compressed air in the brake valve is discharged through the first and second air outlets to the atmosphere. This invention reduces brake pedal force without changing the commercial vehicle assembly, reducing the design and manufacturing costs and difficulty of achieving brake pedal force reduction.

The application discloses a MGP packaging mold cake automatic discharging machine applied to the filtering field, and a dust removal box is fixedly connected to the outer end of the device body, and a dust suction pipe is fixedly connected to the top end of the dust removal box. Through the dust removal box, dust-containing gas is sent into a dust filter box by using a dust suction pump, is filtered through a rotating elastic dust filter screen, comes into an elastic sleeve, is gathered at the position, forces the elastic sleeve to gradually expand, and when the pressure threshold limit of a pressure limiting valve is reached, the elastic sleeve starts to contract, so that the elastic dust filter screen starts to reciprocate under the action of the elasticity, gives the dust an initial speed of moving to the right, at this time, water is squeezed out from the water-absorbing fiber under the extrusion of the movable plate, a large amount of water droplets are formed at the water outlet hole, the dust collides with the water droplets and adheres to the water droplets, and finally, under the action of gravity, the dust rolls down and is collected by the dust collecting box, and a series of work of shaking off, capturing and collecting the dust is completed.

The utility model relates to a pressure cooker cover, including the cover, button, transmission part and pressure limiting valve, the cover is provided with at least two accommodation cavities, the accommodation cavity is provided with the exhaust pipe, the pressure limiting valve is with the activity mode setting in the accommodation cavity, the pressure limiting valve is closed corresponding exhaust pipe under the action of gravity, the cover is provided with button accommodating cavity, the button is with the activity mode and places in button accommodating cavity, through setting at least two accommodation cavities and corresponding pressure limiting valve on the cover, and adopting button drive transmission part synchronous belt drive multiple pressure limiting valve to open exhaust pipe, make the steam in the pot can be discharged rapidly via multiple exhaust passages, not only significantly improved the pressure relief efficiency, shortened the cover opening waiting time, formed double pressure relief path simultaneously, still can pass through other passage safe pressure relief when one of exhaust passages is abnormal, effectively promoted the security and reliability in the use process.

The utility model discloses a riveting device for a pressure-limiting valve of a high-pressure oil rail assembly, which belongs to the technical field of assembly of automobile parts, is used for pressing a thin wall of the pressure-limiting valve, and comprises a driving mechanism and a riveting mechanism, the top of the pressure head assembly is in driving connection with the driving mechanism, and the pressure head assembly is arranged above the pressure limiting valve; the positioning mechanism is provided with a positioning hole, and the bottom of the pressure limiting valve is installed in the positioning hole; the pressing head assembly, the positioning mechanism and the pressure limiting valve are coaxial in the vertical direction, and the driving mechanism drives the pressing head assembly to move downwards to the to-be-pressed position of the pressure limiting valve to be pressed inwards. The thin wall machined by the riveting device has the advantages of high connection strength, vibration resistance, sealing consistency and the like after deformation, the debugging rejection rate of pressure-limiting valve parts is greatly reduced, the technological maturity of pressure-limiting valve products is improved, and the reliability and durability of the products are improved.

The invention relates to a hydrogen supply system for an internal combustion engine, comprising a high-pressure region (A) on the inlet side, a low-pressure region (C) on the outlet side, and a medium-pressure region (B) arranged fluidically between the high-pressure region (A) and the low-pressure region (C), a mechanical pressure reducing device (15) is provided for reducing a high pressure in the high-pressure region (A) to a medium pressure in the medium-pressure region (B), and wherein an electrically actuatable pressure reducing device (23) is provided for reducing a medium pressure in the medium-pressure region (B) to the low pressure in the low-pressure region (C). In this case, a pressure-limiting valve (17) is arranged in the medium-pressure region (B) and / or the low-pressure region (C) and a shut-off valve (22) is arranged downstream of the pressure-limiting valve. The hydrogen supply system according to the invention can in particular consist of only one hydrogen supply unit ("single cartridge solution").

A pneumatic system for a vehicle comprising an air compressor and a pressure circuit in fluid communication with the air compressor, the pressure circuit comprising a lower pressure branch and a high pressure branch in fluid communication with each other. The pneumatic system further comprises a controllable pressure limiting valve separating the low pressure branch from the high pressure branch.

The invention relates to a vehicle interior ventilation device (20) having a pressure-limiting valve assembly (21) and a frame-shaped component (22) for laterally delimiting the pressure-limiting valve assembly (21) and / or fixing the pressure-limiting valve assembly (21) in a receiving opening of a vehicle body component (30). In particular, according to the invention, the vehicle interior ventilation device (20) has a fan device (23) which is actuated or can be actuated as required.

The utility model discloses a kind of pressure-limiting valve and cooking utensil, belong to cooking utensil technical field, purpose is to overcome the defect that existing pressure-limiting valve is not easy to disassemble. Pressure-limiting valve includes valve body, the valve body has opening downward mounting groove, the inside wall of the valve body has assembly groove, the movable limit piece of assembly groove can be set, the convex part of the limit piece projects from the inside wall of the valve body, elastic member is equipped between the limit piece and the valve body, to make the limit piece tend to move to the mounting groove. The pre-pressure of elastic member is stronger controllability, facilitate the clamping force control of limit piece to exhaust pipe in reasonable range, avoid too loose or too tight, give consideration to connection stability and disassembly convenience.

This invention discloses a technical field of lubricating oil processing, particularly relating to a lubricating oil hydrorefining equipment, comprising a high-pressure tank, a high-pressure pump, an oil inlet pipe, and a hydrogen inlet pipe; it also includes a spiral plate, a permeate membrane separator, an exhaust pipe, a vacuum pump, and an oil outlet pipe. The output ends of the oil inlet pipe and the hydrogen inlet pipe are both located in the lower part of the hydrogenation chamber of the high-pressure tank. The spiral plate is installed in the middle of the hydrogenation chamber of the high-pressure tank, and a hydrogenation catalyst is disposed on the surface of the spiral plate. The permeate membrane separator is installed in the upper part of the hydrogenation chamber of the high-pressure tank, and a permeate membrane for hydrogen and waste gas to enter is disposed on the outer wall of the permeate membrane separator. The input end of the exhaust pipe extends into the interior of the permeate membrane separator, and the output end of the exhaust pipe is connected to the vacuum pump. The input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and a pressure limiting valve is disposed at the output end of the oil outlet pipe. Hydrogenation mixing, hydrogenation refining, and oil-gas separation are carried out in a high-temperature and high-pressure tank, with high integration, low energy consumption, and high refining efficiency.

The invention belongs to the technical field of petroleum well cementation simulation tests, and discloses a simulation experiment device and method for dynamic corrosion of carbon dioxide to well cementation cement stone. The simulation experiment device comprises a kettle body, a liquid carbon dioxide bottle and a carbon dioxide recovery bottle, the kettle body is provided with an upper end opening, a lower end opening and a containing cavity, the upper end opening and the lower end opening are communicated with the upper end and the lower end of the containing cavity respectively, and a test combination body is placed in the containing cavity. The test assembly comprises a rock core, and set cement and a sleeve which are sequentially arranged on the outer side of the rock core in a sleeving manner; the liquid carbon dioxide bottle is connected with the upper port through a liquid inlet pipe so as to inject liquid carbon dioxide into the containing cavity, and a booster pump is arranged on the liquid inlet pipe. The carbon dioxide recovery bottle is connected with the lower port through a liquid return pipe to recover liquid carbon dioxide, and a pressure limiting valve is arranged on the liquid return pipe. According to the invention, the flowing of carbon dioxide in the stratum and the corrosion simulation of the cement stone at the well cementation interface are realized, and the actual working condition that the cement stone is corroded by carbon dioxide under the stratum condition is more truly reduced.

A method for determining at least one volume flow rate in an apparatus for a hydraulic system, including the steps of: determining a temperature of the medium in the reservoir, determining a total volume flow rate conveyed by the hydraulic pressure source in the first hydraulic line depending on the temperature, determining a first partial volume flow rate discharged into the reservoir through the pressure-limiting valve, and determining a second partial volume flow rate through the aperture and the throttle to the device as a difference between the total volume flow rate and the first partial volume flow rate.

The invention relates to a vehicle interior ventilation device (20) with a pressure relief valve assembly (21) and a frame-shaped component (22) for laterally enclosing and / or fixing the pressure relief valve assembly (21) in a receiving opening of a vehicle body component (30). According to the invention, it is particularly provided that the vehicle interior ventilation device (20) has a fan assembly (23) that is controlled or controllable as required.

Provided in the embodiments of the present application are a cooking method, a control apparatus, a cooking appliance and a storage medium, which belong to the technical field of household appliances. The cooking method comprises: when a pressure-limiting valve is arranged at an exhaust port, steaming food in a cooking chamber of a cooking appliance; and after the steaming of the food ends, removing the pressure-limiting valve from the exhaust port to roast the food. By using the moisture of the food itself for steaming, the moisture evaporates into steam, and the superheated steam can quickly basically cook the food through. At a food roasting stage, the pressure-limiting valve is removed from the exhaust port, the steam in the cooking chamber can be quickly discharged from the exhaust port, and the surface of the food can be quickly browned. By controlling the pressure-limiting valve and the exhaust port at the steaming stage and the roasting stage, the moisture of the food is indirectly controlled, thereby realizing automatic switching between steaming and roasting, allowing the food to be cooked so as to have a crispy exterior and a tender interior, and improving the intelligence level and use experience of the cooking appliance.

The invention provides a mining multifunctional valve group and a control method thereof, the mining multifunctional valve group is connected among a hydraulic rotary motor, a pair of execution cylinders and a pair of synchronous oil cylinders, and the mining multifunctional valve group comprises a valve body, a first pressure reducing valve, three two-position three-way electromagnetic directional valves, a pair of two-position four-way proportional valves and a synchronous flow distributing and collecting valve; the two two-position four-way proportional valves are respectively provided with a pair of pressure compensation valves, a pair of pressure limiting valves and a shuttle valve; the pressure compensation valve is used for adjusting the working oil pressure, the pressure limiting valve is used for carrying out secondary pressure setting on the pressure required by each executing mechanism and simultaneously meeting the requirement for instant high-pressure discharging, and the shuttle valve is used for enabling each two-position four-way proportional valve to output pressure outwards after a fixed pressure difference is added on the corresponding highest pressure. The mining multifunctional valve group can prevent the shaking phenomenon caused by pressure fluctuation of an oil source, improve the control precision of each executive component in a bottom cleaning device, avoid impact damage to a control valve due to action change of the executive component or encountering an external load, and avoid accidental rotation of a rotation mechanism.

The utility model relates to a kind of high-reliability pressure-limited pressure cooker exhaust structure, including pressure-limiting valve and exhaust pipe, the outer thread is only set in the gas outlet end outer periphery of exhaust pipe, the small diameter size of the outer thread is greater than the non-gas outlet end size of exhaust pipe, the pressure-limiting valve includes coaxially arranged inner valve body and outer valve body, the outer valve body is fixedly sleeved in the outer periphery of the inner valve body, the inside of the inner valve body is formed with accommodating cavity, the bottom of the inner valve body is provided with the opening being communicated with accommodating cavity, the opening is fixedly provided with insert, the center of the insert is provided with the internal thread being matched with the outer thread, valve tip is fixedly arranged in the accommodating cavity, the gas outlet end of exhaust pipe is inserted into accommodating cavity. After using such scheme, the risk that pressure-limiting valve is accidentally dropped due to snap spring fatigue or improper operation is fundamentally eliminated by using thread structure, and the safety and connection reliability are greatly improved.

The invention discloses a hydraulic control system and method for free switching of high impact and low impact of a drill jumbo and relates to the field of engineering machine.The hydraulic control system comprises a pump assembly, an oil outlet valve set, a main reversing valve and a pressure limiting valve set. When the main reversing valve is located at the first station, the pressure limiting valve set sets the standby pressure of the hydraulic control system to the overflow pressure value of the third overflow valve, the pump assembly maintains the minimum flow output, when the main reversing valve is located at the second station, the highest impact pressure is limited to the overflow pressure value of the first overflow valve, and the pump assembly is suitable for tapping and soft rock working conditions, and when the main reversing valve is located at the third station, the highest impact pressure is limited to the overflow pressure value of the second overflow valve. The impact pressure is limited to the overflow pressure value of the second overflow valve, the impact power of the drill jumbo is prevented from exceeding the limit, the drill jumbo is suitable for hard rock and deep hole working conditions, through cooperation of the control oil ports and the pressure limiting valve set, different highest system pressures are limited under different working conditions, segmented control over the high impact pressure and the low impact pressure can be achieved, and the working efficiency is improved.

The utility model discloses an ear-nose-throat atomization dosing device, including atomizer and medicine delivery pipe, and the medicine delivery pipe's medicine inlet end is communicated with the medicine outlet end of atomizer and is installed, still include: gas heater, its top side in the medicine outlet end of atomizer and with the fixed connection of atomizer's outer wall, the soft pad, its inside hollow forms and forms the flow guide groove, the middle position of soft pad one end fixedly penetrates and installs the pressure limiting valve, and the air inlet end of pressure limiting valve and the exhaust end of gas heater are communicated and installed, be equipped with exhaust mechanism in the flow guide groove. This improved ear-nose-throat atomization dosing device uses, can under the condition that almost does not influence medicine delivery pipe bending deformation, synchronous to atomization medicine for sustained heating treatment, to make the atomization medicine of medicine delivery pipe discharge always maintain in the warm state, can greatly reduce atomization medicine in with patient ear-nose-throat inside contact to patient's irritability, not easy to cause patient to feel uncomfortable.

This invention provides a lid and a cooking appliance having the same. The lid includes: a lid body, comprising a snap-on lid and an inner lid, with an exhaust chamber formed between the snap-on lid and the inner lid, and the inner lid having a connecting hole; an exhaust assembly, comprising a check valve, an exhaust pipe, and a pressure-limiting valve, the check valve having a connecting position and a stop position, the exhaust pipe passing through the snap-on lid, the center line of the exhaust pipe being offset from the center line of the connecting hole, and the pressure-limiting valve being positioned above the exhaust pipe, having a pressure-limiting position and an exhaust position; and a drive unit, comprising a drive component and a transmission component, the transmission component being rotatably configured, the transmission component driving the check valve to switch between the connecting position and the stop position, and the transmission component driving the pressure-limiting valve to switch between the pressure-limiting position and the exhaust position. When the check valve is in the connecting position, the pressure-limiting valve is in the pressure-limiting position; when the check valve is in the stop position, the pressure-limiting valve is in the exhaust position. This solution can solve the problem of food inside the pot overflowing outside the lid.

The application provides an upper cover and a cooking utensil with the same. The upper cover comprises a cover body, a buckling cover and an inner cover. A space between the buckling cover and the inner cover forms an exhaust cavity. The inner cover has a communication hole and a backflow hole which are spaced apart and arranged through. The upper cover further comprises an exhaust assembly, a backflow valve and a driving assembly. The exhaust assembly comprises a stop valve, an exhaust pipe and a pressure limiting valve. The stop valve has a communication position and a stop position. The exhaust pipe is arranged through the buckling cover. The pressure limiting valve is arranged above the exhaust pipe. The pressure limiting valve has a pressure limiting position and an exhaust position. The backflow valve is arranged on the buckling cover. The backflow valve has a backflow position and a blocking position. The driving assembly comprises a driving part, a first transmission part, a second transmission part and a third transmission part. The driving part can drive the stop valve through the first transmission part. The driving part can drive the backflow valve through the second transmission part. The driving part can drive the pressure limiting valve through the third transmission part. The technical scheme provided by the application can solve the problem that slurry flows out of the upper cover when the upper cover is opened.

The embodiment of the application provides a cooking method, a control device, a cooking appliance and a storage medium, and belongs to the technical field of household appliances. The cooking method comprises the following steps: in the state that a pressure limiting valve is arranged at an exhaust port, steaming food in a cooking cavity of a cooking appliance; after the steaming of the food is completed, moving the pressure limiting valve away from the exhaust port to bake the food. The food is steamed by using the moisture of the food itself, the moisture evaporates into steam, and the overheated steam can quickly cook the food. In the baking stage of the food, the pressure limiting valve is moved away from the exhaust port, the exhaust port can quickly exhaust the steam in the cooking cavity, the surface of the food can be quickly carbonized, the moisture of the food is indirectly controlled by controlling the pressure limiting valve and the exhaust hole in the steaming stage and the baking stage, automatic switching of steaming and baking is realized, the cooking effect of the food is achieved, the intelligent level and the use experience of the cooking appliance are improved.