49results about How to "Improve gas supply efficiency" patented technology

The invention provides an air conditioning system. The air conditioning system comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a throttling device and an airfeeding device; the compressor comprises a first air sucking port, a second air sucking port, an exhaust port, an air feeding port and a pump body module; the pump body module comprises a first cylinder and a rotor; the first cylinder is provided with a first air sucking inlet, a first exhaust outlet, an air feeding inlet, an air feeding channel, a first slide piece and a first slide piece groove; a first end of the first slide piece butts against the periphery of the rotor to divide a compression cavity into an air sucking cavity and an exhaust cavity; when the air feeding channel and the first air sucking inlet are commonly connected to the air sucking cavity, the air feeding channel is closed; and when the air feeding channel and the first exhaust outlet are commonly connected to the exhaust cavity, the air feeding channel is opened when the air feeding pressure is higher than or equal to the pressure in the exhaust cavity, and is closed when the air feeding pressure is lower thanthe pressure in the exhaust cavity. The air conditioning system can prevent the air feeding backflow, meanwhile, guarantees the strength of the slide piece, and reduces the air feeding resistance.

The invention provides a two-stage enthalpy-increasing rotor compressor. The two-stage enthalpy-increasing rotor compressor comprises a high-pressure-stage air cylinder, a middle cover plate assembly, a low-pressure-stage air cylinder, a lower flange and a lower cover plate, which are sequentially arranged from top to bottom, wherein the low-pressure-stage air cylinder is used as a primary compression cylinder, and the high-pressure-stage air cylinder is used as a secondary compression cylinder; a first middle cavity is formed inside the middle cover plate assembly, a second middle cavity is formed between the lower flange and the lower cover plate, the first middle cavity is communicated with the second middle cavity, a first exhaust opening and a first air replenishing opening are formed in the first middle cavity, and a second exhaust opening and a second air replenishing opening are formed in the second middle cavity; the first exhaust opening is communicated with an upper exhaust incision of the low-pressure-stage air cylinder, the second exhaust opening is communicated with a lower exhaust incision of the low-pressure-stage air cylinder, the first air replenishing opening and the second air replenishing opening are communicated with an enthalpy increasing opening of the low-pressure-stage air cylinder, and the first middle cavity is communicated with an air suction opening of the high-pressure-stage air cylinder. The invention also relates to an air conditioner. By adopting the two-stage enthalpy-increasing rotor compressor and the air conditioner, the volume of the middle cavity is increased, the fluctuation of the pressure of the middle cavity is effectively prevented, and the air replenishing efficiency is high.

The invention discloses a system and an operating method for treating rubbish leachate and urban household sewage in a combined way. The system comprises a rubbish leachate pretreatment unit and a mixed sewage biological treatment unit, wherein rubbish leachate enters the rubbish leachate treatment unit firstly, drained water is mixed with urban household sewage, the mixture enters the biological treatment unit, and drained water treated by the biological treatment unit is discharged after reaching the standard; the rubbish leachate pretreatment unit is an electrochemical reactor which is mainly used for pretreating rubbish leachate and removing a part of ammonia nitrogen and toxic and harmful substances contained in the rubbish leachate; and the mixed sewage biological treatment unit is a membrane aeration bioreactor (MABR) which is suitable for treating sewage of low COD (Chemical Oxygen Demand) / NH<3->N and is mainly used for removing organic matters and denitrifying. The system and the operating method are suitable for treating waste water, such as rubbish leachate and the like with high ammonia-nitrogen ratio and low ammonia-nitrogen ratio.

The invention relates to a moving integrated CNG (compressed natural gas) storage and transportation gas supplying device and a control method, belonging to the field of integrated CNG transportation, storage and gas supplying devices. The device comprises a moving integrated high-pressure gas transportation vehicle, a gas filling machine installed at a substation, a pipeline system, a station loading hydraulic moving platform gas storage tank system, a control system, wherein the station loading hydraulic moving platform gas storage tank system is connected with the pipeline system; the control system is installed at a gas filling station; the moving integrated high-pressure gas transportation vehicle also comprises a flat dragging vehicle (2), a hydraulic automatic unloading vehicle system (3) and a vehicle loading gas storage tank system (1), and the hydraulic automatic unloading vehicle system (3) is installed on the flat dragging vehicle (2); the vehicle loading gas storage tank system (1) is installed on the hydraulic automatic unloading vehicle system (3). By virtue of arranging a vehicle-loading and station-loading moving device, the CNG gas transportation and storage are integrated, through the controlling of a PLC (programmable logic controller) central control system, the residual gas in an empty can is transported to other storage cans in the platform, and the residual amount of the empty can gas in ensured to not exceed 3%; and the empty residual gas amount is greatly less than 20% of that in the prior art, and the transportation expense and a great deal of energy sources are saved.

The invention aims at providing a coaxial dual-electromagnetic fuel gas injection valve with the flowing sectional area adjustable. The adjustable gas injection flow is achieved through a dual-valve-element dual-electromagnet control structure. The air inflowing and flow guiding process is achieved through a bypass structure and a flow guiding cavity structure; valve element control and gas way control are achieved through actuator control, and a gas injection function is achieved; through cooperation of an external guiding structure, an internal flow guiding cavity and a pressure balancing groove, the perpendicularity of a valve element is guaranteed, stable and reliable work of gas flow is achieved, and the high responding speed is achieved; through a mixed gas inflowing mode of combining direct gas inflowing of an axial main gas groove and gas inflowing of circumferential gas supplementing holes, high flow is achieved, the gas supplying efficiency of an engine is effectively improved, and meanwhile gas flow interference can be avoided, so that gas way stability is achieved; face sealing and high reliability of the fuel gas injection valve are achieved through multiple annular strip structures between the valve element and a valve base.

The invention provides a high-efficiency large-scale method for culturing algae. The method comprises the following steps: pre-treating a culture pool and pre-treating water for cultivation, adding amedium in the culture pool, and inoculating the algae species in the culture pool according to inoculation density; performing real-time monitoring on algae groups size, and luminous intensity, temperature, and pH value in the culture pool as well as photochemical active index of algae cell PSII, and performing protection adjusting measurement according to the monitoring data. The method can realize effective suspension of algae at each growth period, and can efficiently use light, nutrition and CO2 to realize rapid growth. The obtained algae biomass can produce functional food, a food raw material, bait, a high added value secondary metabolite and biodiesel.

Inert gas supply nozzle is mounted on a ladle body in such a manner its output-side end surface is inclined upward, relative to the bottom surface of a molten material passageway portion, in a direction toward a molten material discharge opening formed in the ladle body. Even when a portion of the molten material flows upward toward the nozzle's output-side end, that portion can be reliably prevented from entering the output-side end portion of the nozzle, by virtue of the inclined end surface. Thus, the inert gas supply nozzle can function to supply the inert gas into the molten material in a stable manner over a long period of time.

A bottom air supply type cooling tower is provided to reduce the installation area of a water collection unit, an operation load, and operation noise. A bottom air supply type cooling tower comprises an air supply guide unit, an outer water collection unit, a central water collection unit(90a), a pair of air supply ports(12), and a cooling tower supporter(150). The air supply guide unit has a guide blades(21) and blade fixing members(22a). The outer water collection unit collects bypassed cooling water and discharges the cooling water. The central water collection unit has a collection tank(92), a support flange(93), and a cooling water outlet(91). The air supply ports are formed between the inner wall of the outer water collection unit and the side wall of the water collection tank.

The invention provides an air conditioner system. The air conditioner system includes a compressor. The compressor includes a pump body assembly. The pump body assembly includes a first air cylinder and a rotor. A cylinder body of the first air cylinder is provided with a first air suction inlet, a first air exhaust outlet, a first air replenishing inlet and a first air replenishing channel. The first air replenishing channel can optionally communicate with the first air replenishing inlet. The cylinder body is further provided with a first sliding piece and a first sliding piece groove. The first end of the first sliding piece abuts against the periphery of the rotor to divide a compression cavity into an air suction cavity and an air exhaust cavity. When the first air replenishing channel and the first air suction inlet jointly communicate with the air suction cavity, the first air replenishing channel is closed; and / or when the first air replenishing channel and the first air exhaust outlet jointly communicate with the air exhaust cavity, the first air replenishing channel is opened when the air replenishing pressure is equal to or greater than the pressure in the air exhaust cavity, and the first air replenishing channel is closed when the air replenishing pressure is less than the pressure in the air exhaust cavity. According to the air conditioner system, air replenishingand backflow can be avoided, meanwhile, the strength of a sliding piece is ensured, and air replenishing resistance is reduced.

The invention aims to provide a straight-through type outer guide gas injection valve with a float valve seat. Through the float valve seat structure, the function of avoiding reverse leakage caused by unbalanced pressures inside and outside the gas injection valve is achieved, and the operation reliability of the gas injection valve is ensured; the gas inlet and flow guiding processes are achieved through a straight-through structure and a flow guiding cavity structure; control over a valve element and a gas path is achieved through control of an actuator, and the gas injection function is achieved; through cooperation of an outer guide structure, a pressure balance hole and a pressure balance groove, the verticality of the valve element is ensured, stable operation and reliable operation of gas flow are achieved, and the high response speed is achieved; through a mixed gas inlet mode of axial main gas groove direct gas inlet and circumferential supplementation hole gas inlet, high flow is achieved, the gas supply efficiency of an engine is effectively improved, meanwhile, gas flow interference can be avoided, and gas path stability is achieved; and through a plurality of annulus structures between the valve element and the valve seat, face seal of the gas injection valve is achieved, and the high reliability is also achieved.

The invention discloses soil remediation gas injection equipment for soil treatment. The invention belongs to the technical field of soil remediation gas injection equipment. A device is moved to a proper position through a supporting assembly; a driving motor is started to drive a driving rotating shaft to rotate; the driving rotating shaft drives a main transmission gear to rotate; the main transmission gear drives a transmission screw to drive a lifting assembly to rotate so as to drive an outer sliding sleeve to move downwards and rotate at the same time. A soil breaking assembly is used for breaking soil, the driving assembly is started after the soil breaking assembly enters the soil to drive a plug-in exhaust rod to be inserted into the soil, then an air storage filtering assembly is used for deflating and supplying air, punching and air integration is achieved, the air supply area is increased, and the air supply efficiency is improved.

The invention discloses a multistage air supplementing screw compressor with an economizer loop. More than two compression stages are executed on a pair of male and female rotors, wherein each mutually separated compression stage is provided with at least two air supplementing ports at different positions; the air supplementing ports at different positions are located at the same air supplementingpressure or different air supplementing pressure positions, and at least two air supplementing ports at different compression stages are located at different air supplementing pressure positions respectively. When the compression ratio is greater than a first preset numerical value, the air supplementing loops of the first compression stage and the second compression stage are opened; when the compression ratio is greater than the second preset value and less than the first preset value, the air supplementing loop of the first compression stage is opened; when the compression ratio is less than a second preset numerical value, the air supplementing loop of the first compression stage is opened or closed. The screw compressor can adapt to further improvement of capacity and energy efficiency under the large-pressure-ratio working condition, the exhaust temperature of the screw compressor can be reduced, the operation range of the compressor is expanded, and the reliability of the compressor is improved.

The invention aims at providing a bypass type inner guide fuel gas injection valve with a floating valve seat. Through the floating valve seat structure, reverse leakage caused by imbalance of the internal and external pressure of the fuel gas injection valve is avoided, and the working reliability of the fuel gas injection valve is guaranteed. The gas intake and flow guide process is realized through a bypass structure and a flow guide cavity structure. An actuator is used for controlling a valve element and a gas circuit to realize the function of gas injection of the fuel gas valve. Through cooperation of an inner guide structure, pressure balance holes and pressure balance slots, the perpendicularity of the valve element is guaranteed, the working stability and reliability of gas flow are realized, and the response speed is high. The mixed gas intake method of direct gas intake through an axial main gas slot and gas intake through circumferential gas make-up holes, the large flow is realized, and the gas supply efficiency of an engine is effectively improved. Meanwhile, gas flow interference can be avoided, and the stability of the gas circuit is realized. Through multiple ring band structures between the valve element and the valve seat, surface sealing and high reliability of the fuel gas injection valve are realized.

The invention discloses a sewage recovering and microbial protein synthesizing device and method, and belongs to the technical fields of water treatment and recycling. An anaerobic digestion unit decomposes organic substances in sewage and generates methane and carbon dioxide. A nano-filtration membrane separation unit holds back macromolecular harmful substances in effluent from the anaerobic digestion unit and releases the ammonia nitrogen micromolecular substance. Methane and carbon dioxide generated by the anaerobic digestion unit are introduced into a microbial protein production unit; under the interaction between micro-alga and methane oxidizing bacteria, ammonia nitrogen in the effluent from the nano-filtration membrane separation unit is taken as a nutrient to synthesize microbialprotein, the micro-alga uses carbon dioxide as a carbon source and generates oxygen through photosynthesis; methane oxidizing bacteria take methane as a carbon source and utilize oxygen generated bymicro alga to generate carbon dioxide at the same time; three unit are coupled together; and the nano-filtration membrane separation unit effectively isolates the harmful substances in the effluent from the anaerobic digestion unit to guarantee that the subsequent microbial protein production is not influenced by the pollutants.

The invention discloses an air compressor set double feedback control system. The air compressor set double feedback control system comprises a small compressor set body used for providing low-pressure air, a low-pressure pipeline, led to low-pressure air users, of the small compressor set body, a large compressor set body used for providing high-pressure air, and a high-pressure pipeline body, led to high-pressure air users, of the large compressor set body. An interflow pipeline and a flow distributing valve controlling the interflow pipeline to be connected or disconnected are arranged between the low-pressure pipeline and the high-pressure pipeline. The low-pressure pipeline is provided with a low-pressure flowmeter and a low-pressure pressure meter. The high-pressure pipeline is provided with a high-pressure pressure meter. The control system further comprises a flow controller and a pressure controller. According to the control method of the control system, the combinational control function is achieved through a linkage induction control circuit between the flow controller and the pressure controller. Linkage control is adopted, the system does not need to be watched by many persons and can provide different compressed airs for the users for use, the air supply efficiency is high, and the power consumption is low.

The invention provides a two-stage enthalpy-increasing rotor compressor. The two-stage enthalpy-increasing rotor compressor comprises a high-pressure-stage air cylinder, a middle cover plate assembly, a low-pressure-stage air cylinder, a lower flange and a lower cover plate, which are sequentially arranged from top to bottom, wherein the low-pressure-stage air cylinder is used as a primary compression cylinder, and the high-pressure-stage air cylinder is used as a secondary compression cylinder; a first middle cavity is formed inside the middle cover plate assembly, a second middle cavity is formed between the lower flange and the lower cover plate, the first middle cavity is communicated with the second middle cavity, a first exhaust opening and a first air replenishing opening are formed in the first middle cavity, and a second exhaust opening and a second air replenishing opening are formed in the second middle cavity; the first exhaust opening is communicated with an upper exhaust incision of the low-pressure-stage air cylinder, the second exhaust opening is communicated with a lower exhaust incision of the low-pressure-stage air cylinder, the first air replenishing opening and the second air replenishing opening are communicated with an enthalpy increasing opening of the low-pressure-stage air cylinder, and the first middle cavity is communicated with an air suction opening of the high-pressure-stage air cylinder. The invention also relates to an air conditioner. By adopting the two-stage enthalpy-increasing rotor compressor and the air conditioner, the volume of the middle cavity is increased, the fluctuation of the pressure of the middle cavity is effectively prevented, and the air replenishing efficiency is high.

The invention discloses a push type sludge continuous aerobic fermentation system and an application method thereof. The push type sludge continuous aerobic fermentation system comprises a fermentation cabin, a feeding device, a gas supply device, a material stirring and pushing device, a waste gas purification device and a discharging device; and during application, to-be-treated residual sludgeof sewage treatment as well as biomass and rotten sludge are mixed uniformly, the mixture is fed into the fermentation cabin to be fermented and be pushed forwards continuously, and the obtained rotten sludge is continuously discharged. The push type sludge continuous aerobic fermentation system provided by the invention can perform continuous feeding, fermentation and discharging, operates stably, improves the running efficiency of equipment such as the fermentation cabin, and can realize automatic and high-level maintenance management conveniently.

The invention discloses a baffling type ozone pre-oxidation combined biological filter advanced treatment method. The method is characterized in that an ozone oxidation and tail gas utilization technology is combined with a biological filter for advanced treatment on wastewater, the wastewater and ozone are mixed by a supercharged jet mixer and then enter an ozone pre-oxidation unit for pre-oxidation, then the waste water enters a tail gas treatment tower for gas-water separation so that decomposition and damage of residual ozone in the waste water and tail gas are completed, effluent and tailgas of the tail gas treatment tower are pressurized by a pipeline booster pump and a venturi ejector to be atomized at a high speed and then enter a biological treatment unit, and final biodegradation of pollutants in the wastewater is realized. The ozone pre-oxidation unit and the biological treatment unit are respectively formed by connecting a plurality of closed pre-oxidation towers and biological filtration towers in series through baffling, and oxygen required by the biological filtration towers is provided after tail gas of the ozone pre-oxidation unit is treated. The method provided by the invention can reduce the ozone dosage, and has the advantages of high ozone utilization efficiency, good wastewater treatment effect and efficient and stable system operation.

The invention discloses an electronic injection motorcycle idling air compensating valve mounting structure which comprises an air filter (1) and an idling air compensating valve (2). An air throttle connecting pipe (3) is mounted on the front end wall of the air filter (1), the idling air compensating valve (2) is positioned below the air throttle connecting pipe (3) and is mounted on the front end wall of the air filter (1) in an embedded manner and is tightly compressed and positioned by a support (7), an air inlet nozzle (2a) of the idling air compensating valve (2) is positioned inside the air filter (1), and an air outlet nozzle (2b) of the idling air compensating valve (2) is positioned outside the air filter (1). The idling air compensating valve is directly mounted on the air filter and is simple and convenient to mount and fine in reliability, an air compensating passage is greatly shortened, the air compensating efficiency of an engine is improved, and the mounting structure has the advantages of reasonable design, easiness in implementation, low improvement cost and the like, and is applicable to various electronic injection motorcycles.

The purpose of the invention is to provide an anti-reversed integrated cross circular-groove gas fuel spraying and mixing device. Gas fuel is conveyed to the system through a pipeline, firstly a fuel spraying valve is passed, and an actuator controls the opening and the closing of a valve by controlling a valve element; mass flow is achieved through a mixed air-incoming mode of axial main air drain direct air-incoming and circumferential air-supplying hole air-incoming, and the air-supplying efficiency of an engine is effectively improved; surface sealing of a fuel gas spraying valve is achieved through a multichannel zone structure between the valve element and a valve seat, and the high reliability is achieved; through a floating valve seat structure, the function that reverse leakage caused by imbalance of internal and external pressure of the fuel gas spraying valve is avoided is achieved, and the working reliability of the fuel gas spraying valve is ensured; through a fuel diffusing pipe cavity structure, the fuel can be distributed in the whole system, and the continuity and the responsiveness of air-supplying of an air-supplying system are achieved; and through a circular groove structure, the improvement of the mixing degree of the fuel and air is promoted, the circular groove structure is beneficial to combustion, and the working performance of the system is improved.

The invention relates to the technical field of energy recovery, in particular to an energy recovery system. The system comprises a heat energy generating device, a heat storage device, a supply pipeline and a heat exchanger, wherein the heat energy generating device is used for generating a first fluid; the heat storage device is used for storing the first fluid, the heat storage device is connected with a first inlet of the heat exchanger; the supply pipeline is used for providing a second fluid to the heat exchanger, wherein the supply pipeline is connected with a second inlet of the heat exchanger, the temperature of the second fluid is less than the temperature of the first fluid; a first outlet of the heat exchanger is connected with an inlet of the heat energy generating device, wherein the second fluid absorbs heat of the first fluid in the heat exchanger, so that the temperature of the first fluid is reduced, and the cooled first fluid is supplied to the heat energy generatingdevice. According to the energy recovery system, the first fluid generated by the heat energy generating device is collected, and the collected first fluid is returned to the heat energy generating device, the recycling of the first fluid is realized, the recovery of the heat energy of the first fluid and the recovery of the first fluid are included, and the utilization rate of the energy is improved.

The invention discloses an efficient power system for ships and belongs to the field of mechanical devices. The efficient power system for ships comprises an oil storage tank, a generator, a ship engine and an engine waste heat device; the oil storage tank is provided with an oil inlet pipe and an oil outlet pipe; the oil outlet pipe is connected with the generator through an oil transmission pipe; a heat dissipating coil is installed at the center of the generator; an air distributor is installed right under the heat dissipating coil; the heat dissipating coil is connected with the engine waste heat device through a waste heat pipe and a backflow waste heat pipe; the engine waste heat device is connected with the ship engine through a circulating water pipe; the generator is provided with a gas outlet pipe; the gas outlet pipe is connected to the internal of the ship engine. The efficient power system for ships of the invention has simple integral structure, stable operation, efficient gas supply and long service life and is low in cost; the size of the whole machine is reduced; the efficient power system for ships is convenient for use and is easy to promote.

The invention discloses a large LNG gasification and two-way pressure regulating integrated prying device. The large LNG gasification and two-way pressure regulating integrated prying device comprises a gasifier A, a gasifier B, a water bath type electric heating device, a pressure regulating device A, a pressure regulating device B, a safely diffusing device A, a safely diffusing device B, a metering device, an odorizing device, a pressure regulating and metering box and a base platform; the gasifier A, the pressure regulating device A, the safely diffusing device A, the metering device and the odorizing device are connected in series through pipes in sequence and are welded to the base platform correspondingly; and the gasifier B is connected to the gasifier A in parallel, the pipe between the gasifier A and the pressure regulating device A is connected with the water bath type electric heating device in parallel, and the pressure regulating device A and the safely diffusing device A are connected with the pressure regulating device B and the safely diffusing device B in parallel. The large LNG gasification and two-way pressure regulating integrated prying device is high in integrated degree and high in reliability, investment is saved, the construction cycle is shortened, operation is simple and convenient, and gas supply efficiency is high.

The invention discloses a multistage air supplementing screw compressor with an economizer loop. More than two compression stages are executed on a pair of male and female rotors, wherein each mutually separated compression stage is provided with at least two air supplementing ports at different positions; the air supplementing ports at different positions are located at the same air supplementingpressure or different air supplementing pressure positions, and at least two air supplementing ports at different compression stages are located at different air supplementing pressure positions respectively. When the compression ratio is greater than a first preset numerical value, the air supplementing loops of the first compression stage and the second compression stage are opened; when the compression ratio is greater than the second preset value and less than the first preset value, the air supplementing loop of the first compression stage is opened; when the compression ratio is less than a second preset numerical value, the air supplementing loop of the first compression stage is opened or closed. The screw compressor can adapt to further improvement of capacity and energy efficiency under the large-pressure-ratio working condition, the exhaust temperature of the screw compressor can be reduced, the operation range of the compressor is expanded, and the reliability of the compressor is improved.

The invention discloses an electronic injection motorcycle idling air compensating valve and air filter combination which comprises an air filter (1) and an idling air compensating valve (2). An air throttle connecting pipe (3) is mounted on the front end wall of the air filter (1), the idling air compensating valve (2) is positioned below the air throttle connecting pipe (3) and is fixedly mounted on the front end wall of the air filter (1) in an embedded manner, an air inlet nozzle (2a) of the idling air compensating valve (2) is positioned inside the air filter (1), and an air outlet nozzle (2b) of the idling air compensating valve (2) is positioned outside the air filter (1). The idling air compensating valve is directly mounted on the air filter and is simple and convenient to mount and fine in reliability, an air compensating passage is greatly shortened, the air compensating efficiency of an engine is improved, and the mounting structure has the advantages of reasonable design, easiness in implementation, low improvement cost and the like, and is applicable to various electronic injection motorcycles.

Disclosed is an environment-friendly gas insulated equipment gas supplement method and its device, the gas insulated equipment is connected to the gas supplement device through a buffer tank, the gas supplement method includes: detecting the current total pressure P of the gas chamber of the gas insulated equipment, The current temperature T°C and the current concentration C of each gas N , and use this to calculate the total amount of mixed gas loss P in the gas chamber of the gas-insulated equipment 补 , the current pressure of each gas in the mixed gas P N , and the pressure difference ΔP of each gas N ; Calculate the volume V of the gas supply device 补 The ratio k to the gas chamber volume V of the gas insulation equipment; the pressure distribution in the gas supply device is 1 / k*P 补 The supplementary gas, the proportion of each gas in the supplementary gas is such that the supplementary gas in the gas supply device is charged into the gas chamber of the gas insulation device through the buffer tank.

The invention relates to a healthy kitchen cooking fume exhaust control system, and belongs to the field of building exhaust structures. The healthy kitchen cooking fume exhaust control system comprises a fume exhaust mechanism communicated with a kitchen, and further comprises an air supplement mechanism communicated with the kitchen; the air supplement mechanism comprises an air supplement pipeline and an air supplement valve; the air supplement pipeline is communicated with the kitchen and the external environment; and the air supplement valve is installed on the air supplement pipeline. According to the invention, the problem that the indoor temperature is easily affected due to the fact that a large amount of energy is exchanged indoors and outdoors when a kitchen door or a window is opened for air supplement is solved, and the effect of reducing the influence on the indoor temperature when the kitchen door or the window is opened for air supplement is achieved.