920results about How to "Guaranteed ventilation effect" patented technology

The invention discloses a longwall mining N00 construction method, which is characterized in that roadway-free tunneling and coal-pillar-free mining are performed in N working faces of a bran-new panel; the whole panel is provided with an air return downhill passage, a belt downhill passage and a rail downhill passage; the air return downhill passage and the rail downhill passage are positioned at one end of the panel; and the belt downhill passage is communicated with the other end of the panel and is communicated with the air return downhill passage. The longwall mining N00 construction method has the advantages that the ventilation of the whole coal mining region can be ensured; during the mining of each working face in the panel, one part of a goaf is used for implementing roof cutting and pressure relief automatic roadway forming; any crossheading roadway does not need to be tunneled; and coal pillars do not need to be reserved, so that resources are saved, and the efficiency is improved.

An ultrasonic transducer element chip includes a substrate, a plurality of ultrasonic transducer elements, a reinforcing member and a ventilation passage. The substrate defines a plurality of openings arranged in an array pattern. The ultrasonic transducer elements are respectively disposed at the openings on a first surface of the substrate. The reinforcing member is fixed on a second surface of the substrate opposite to the first surface of the substrate to reinforce the substrate. Through the ventilation passage, internal spaces of the openings and an external space of the substrate are in communication with each other.

The invention discloses an artificial reproduction technological process and a method of application of aphidoletes aphidimyza. An aphidoletes aphidimyza mass reproduction technology and an application technology are characterized in that pea aphids, pea repaired tail aphids and aphis craccivora koch are reproduced massively by adopting broad beans, and the aphidoletes aphidimyza is reproduced by utilizing the pea aphids, the pea repaired tail aphids and the aphis craccivora koch. The aphidoletes aphidimyza mass reproduction technology and the application technology comprise the following processes: net seedlings are planted, aphids are raised, the aphidoletes aphidimyza is raised, old larvae are collected, and the larvae are saved in the pupal period. Adults are applied to field application and expanding reproduction after eclosion. An efficient and superior method technological process for reproducing aphidoletes aphidimyza is developed so as to solve the to-be-solved problems, and the method that the aphidoletes aphidimyza is used to prevent and control aphids can play a proper role in safe production of vegetables.

The invention belongs to the technical field of stockbreeding machines, relating to small stepped type natural mating breeding equipment for breeding poultry. The small stepped type natural mating breeding equipment comprises a small stepped type natural mating cage and a manure removing device, wherein the small stepped type natural mating cage is formed by combining small stepped type natural mating cage units comprising six chicken cages and two three-layer trapezoid cage frames; every two adjacent stepped type natural mating cage units form a feeding unit; a top-layer chicken cage rear net is opened up and side nets of each layer of two adjacent chicken cages are opened up; and all cage tools of the whole cage groups respectively form a two-in-one large cage. The manure removing device comprises a manure removing machine driving mechanism and two manure removing machines which are respectively arranged below a bottom net of the top-layer chicken cage and bottom nets of two layers of chicken cages; and the manure removing machine driving mechanism can be used for simultaneously driving the two manure removing machines to alternatively carry out manure removing progress and manure removing return, so that the manure removing operation at the top of the cage is implemented. According to the small stepped type natural mating breeding equipment disclosed by the invention, the requirements of welfare breeding of the poultry and natural mating of the breeding poultry can be met; and the small stepped type natural mating breeding equipment is matched with feeding, drinking, trench manure removing and egg collecting systems and is suitable for large-scale intensive breeding poultry farms having high requirement on environmental standard.

An oil mist separator has a pressure regulator valve which is located in the blow-by line downstream of the oil mist separator element in the flow direction of the gas. The pressure regulator valve has a bias so that it opens above a specified pressure difference between the blow-by line and a neighboring chamber. Located around the oil mist separator element is a bypass line which has a bypass valve. The bypass valve has a bias that causes the bypass valve to close below a specified pressure difference between the suction side and the pressure side of the oil mist separation element. The pressure regulator valve and the bypass valve are connected with each other so that the pressure regulator valve, as it closes, increases the bias of the bypass valve.

The utility model relates to an all-regime composite heat source device for convection type photoelectricity conversion and strengthening as well as optothermal recycling, which comprises a composite heat source collecting evaporator, a heat pump and hot water system and an optothermal conversing and storing device, wherein, the core component of the device adopts the all-regime composite heat source device for convection type photoelectricity conversion and strengthening as well as optothermal recycling, the device adopts a photovoltaic battery panel (5) to absorb the solar energy and uses a blower fan (4) to drive the air to perform the forced convective heat exchange to reduce the temperature of the photovoltaic panel, thereby improving the photoelectric transformation efficiency of the photovoltaic battery; simultaneously, the air releases the gained heat to a heat pump system evaporator fixed at the back of a heat collecting panel (6), thereby performing the effect of increasing the vaporization temperature of the heat pump, and improving the operating efficiency of the heat pump; besides, because of the arrangement of a Z-shaped rotating air door (10), when the solar radiation is weak or does not exist, the heat pump system evaporator can absorb the heat of the ambient air as the supplement energy, thereby ensuring the continuous operation of the heat pump.

The invention provides an automatic adjustable sunshade plate for a building, which relates to a sunshade device for the building and mainly consists of a sunshade plate, a step motor, a temperature collector, a light degree collector and a controller, wherein the sunshade plate, the step motor and the temperature collector are outdoor parts, the controller is an indoor part, a controller lead wire arranged above an indoor controller case passes through a wall body and is connected with the outdoor parts, temperature collection signal data collected by the temperature collector and light degree collection signal data collected by the light degree collector are sent into an HT46F49E singlechip to be processed through a control wire, and a press key module and an input / output (I / O) of the HT46F49E singlechip are matched for controlling the driving of the step motor to operate the extending speed and the length of a middle layer narrow plate and a lower layer narrow plate of the sunshadeplate. The singlechip technology and the intelligent algorithm are utilized for realizing the automatic control of the sunshade plate, and the automatic adjustable sunshade plate also overcomes the defects that the installation and the operation of the existing sunshade facility of the building are inconvenient, the damage is easy to occur, the device cost is high, and the indoor brightness can also be seriously influenced when the sunshade effect is realized.

The invention relates to an intelligently controlled forced convection radiation LED streetlamp system, which comprises a lamppost, a lamppost cantilever, a high-power LED streetlamp cap, a radiating fin, a radiating fan and an intelligent drive controller. A radiating substrate of a high-power LED is fixed on the radiating fin; the radiating fan is fixed at one end of the radiating fin; the air intake surface of the radiating fan faces an air outlet of the lamppost cantilever; required airflow enters from air inlets on the upper and lower parts of the hollow lamppost; even if the streetlamp is turned on when the temperature of the substrate of the high-power LED is within a set safety range, the fan does not work and heat is radiated by passive natural convection; and when the temperature of the substrate of the high-power LED exceeds a set safety temperature upper limit 60 DEG C, the fan works and adopts active forced radiation. If the radiating fan fails, excessive dust is accumulated on the air passage and the radiating fin, or the temperature of the LED substrate exceeds a set limit failure temperature 80 DEG C, the circuit of the LED lamp is disconnected, and the controller sends an alarm signal for check and maintenance at the same time.

The invention discloses a positive-pressure direct-firing pulverizing system based on segmented temperature control and a control method of the positive-pressure direct-firing pulverizing system. The positive-pressure direct-firing pulverizing system comprises an air preheater, an air feeder, a primary air fan, a seal air fan, a coal mill, a tailing separator, a raw coal hopper, a coal feeder, a pulverized coal distributor, an isolation door, a pulverized coal feeding system adjustment bellows, a pulverized coal burner and a secondary bellows. According to the control method, an inlet and an outlet of the coal mill are taken as a segment, an inlet and an outlet of a pulverized coal feeding system are taken as another segment, cold air and hot air are fed into the corresponding inlets of the two segments through corresponding pipelines, the temperatures of the two segments are monitored respectively, and then segmented control over the temperature of the pulverizing system is achieved. By means of the control method, the temperature of the pulverizing system and the temperature of the pulverized coal feeding system can be independently controlled, the air speed of the pulverized coal feeding system is kept not decreased under the condition that the air quantity of the pulverizing system is changed, and the demands for conveying pulverized coal and preventing a nozzle from being burnt out are met.

The invention relates to a closed cycle spray drying and solvent recovery system which comprises a feed pump, a spray drying tower, a cyclone dust collector, a bag type dust collector, a filter, an air blower, a condenser and a heater, wherein the lower part of the spray drying tower is provided with an air-blast sprayer, and a nitrogen supply pipe is connected with the feed inlet of the air-blast sprayer; the air outlet of the spray drying tower is connected with the air inlet of the cyclone dust collector through a 1st pipeline, the air outlet of the cyclone dust collector is connected with the air inlet of the bag type dust collector through a 2nd pipeline, the air outlet of the bag type dust collector is connected with the air inlet of the condenser through a 3rd pipeline, the filter and the air blower are serially connected to the 3rd pipeline, the air outlet of the condenser is connected with the air inlet of the spray drying tower through a 4th pipeline, and the heater is serially connected to the 4th pipeline. The system product has the advantages of high yield, guaranteed quality and good security, and is not only suitable for feed liquid with good flowability, but also suitable for feed liquid with high viscosity and poor flowability.

A thermal overload relay has an actuator mechanism that generates an operating force by bending of a main bimetal with a heating wire wound thereon; a switching mechanism that is driven by the operating force from the actuator mechanism; a contact changeover mechanism wherein contacts are changed by the switching mechanism operation; and a casing that contains the actuator, the switching and the contact changeover mechanisms. The casing has main circuit terminals and auxiliary circuit terminals arranged on one side, the main circuit terminals electrically connecting the thermal overload relay to an electric load device, and the auxiliary circuit terminals electrically connecting the thermal overload relay to another electric device. When the casing is viewed in plan, the main circuit terminals are aligned and, the auxiliary circuit terminals are arranged in a position offset from the position of the alignment of the main circuit terminals.

The invention discloses an intelligent litter-cleaning rail-type silkworm breeding device convenient to feed and relates to the technical field of silkworm breeding devices. The device comprises a shed body, a shed cover, a silkworm rack, an auxiliary rack and a pull rod; a first sliding rail and a second sliding rail which are matched with each other and correspond to each other in the position are arranged on a baseplate which is of a U-shaped structure and is arranged on the shed body; the shed cover, a heat preservation pad and a sunshade net are fixed to the opening end of the U-shaped structure of the shed body; a carbon dioxide sensor, a temperature and humidity sensor, an automatic controller, a temperature and humidity adjustment pipe and a ventilation pipe are arranged in the shed body; the silkworm rack is arranged on the first sliding rail, and a silkworm bed and a litter disk are arranged on the silkworm rack; the auxiliary rack is arranged on a second sliding rail. According to the intelligent litter-cleaning rail-type silkworm breeding device, a combined structure of the portable silkworm rack and the auxiliary rack, the temperature and humidity sensor and the automatic controller are arranged in the shed body, the problems, of larger occupation space, difficult breeding and litter cleaning and complex temperature and humidity control of a silkworm chamber, of an existing silkworm rack are solved, the situation is avoided that the growth and development of silkworms are limited by the temperature, the growth speed of the silkworms is improved, and high-yield breeding is achieved.

The invention provides a high-dipping extremely-close-distance coal seam top coal caving mining method. According to the method, a transportation gateway is constructed along one side of a coal layer bottom plate and an air returning gateway is constructed on the other coal layer; the elevation of a bottom plate of the air returning gateway is 4-4.5m higher than that of a bottom plate of the transportation gateway; rectangular roadways are constructed between the two gateways at an interval of 10m and are used as connection roadways; hydraulic brackets are distributed on two coal layers along the thickness directions of the coal layers; each circulating unit advance of a worktable bracket is the same as the distance of the connection roadways; in a top coal caving process, top coal discharged by the coal layers of the transportation gateway and manually-mined falling coal in a manner of manually shoveling coal and filling into a scraper plate conveyor to be transported out; the top coal discharged by the coal layers of the air returning gateway is filled into enamel chutes of the connection roadways in a manner of manually shoveling the coal to flow into a bracket tail beam of the coal layers of the transportation gateway, and is put into the scraper plate conveyor to be transported out by manually shoveling the coal. The high-dipping extremely-close-distance coal seam top coal caving mining method has the advantages of being simple in arrangement of a working surface, strong in adaptability, good in ventilation, relatively good in safety degree, large in supporting space and high in production efficiency.

The invention discloses snow shelter for connecting bridges between tunnels, comprising two groups of movable telescopic snow shelters which are constructed on the connecting bridges between two tunnels, have opposite positions and can be respectively expanded from the tail parts of bridge heads to the middle parts of the bridges along a traveling direction; the movable type telescopic snow shelters comprise fixed sheds installed on tunnel portals and movable sheds which can be contracted into and extended out of the inner sides or the outer sides of the fixed sheds; the fixed sheds are archsnow shelter bodies 1 constructed between the left sides and the right sides of the bridges; and the movable sheds comprise arch snow shelter bodies 2, walking wheels installed below the left sides and the right sides of the arch snow shelter bodies 2, a drive motor driving the walking wheels to move back and forth, a power supply device and a control device controlling the rotational speed and the rotation direction of the drive motor. The invention has attractive appearance, reasonable structure, low construction difficulty, convenient operation and good use effect and also can solve two main problems of low adhesion force of the bridge faces of the connecting bridges between the tunnels at the weather of rain and snow and large drop of the irradiation intensity of the inlets and the outlets of the tunnels.

The invention discloses a mobile heat-insulating louver and an automatic control method thereof. The louver comprises a window frame and louver blades in the window frame, wherein the louver blades are connected with a louver border covered at the periphery of the louver blades; the two ends of the louver border are connected with fixed rotating shafts, one end of each rotating shaft is connected with a rotating motor, and the other end is connected with a bearing; a shell of the rotating motor and an outer race of the bearing are respectively and fixedly connected with a sliding body; each rotating motor and a sliding motor are respectively connected with the rotating command output end and the sliding command output end of a CPU (central processing unit); the set input end of a calculator is used for inputting a temperature threshold value and a motion threshold value, the signal input end of the calculator is connected with a temperature sensor and a radiation sensor, and the signal output end of the calculator is connected with a controller. The controller is used for receiving calculating results of the calculator and controlling the opening degree, the opening direction, the spreading or the retracting conditions of the louver blades. The invention can strengthen the heat insulating property and the air tightness of an outer window in winter, reduce heat absorbing of the outer window in summer, ensure smooth ventilation and improve the heat insulating performance of houses.

The embodiment of the invention provides a subrack and a heat radiating method thereof. The subrack comprises a subrack casing and a fan for driving air to flow, a back plate is arranged in the subrack casing, two sides of the back plate are respectively connected with electronic equipment, an air inlet channel is formed on the back plate and one end of the electronic equipment at the two sides of the back plate, an air inlet is arranged on the subrack casing on one side of the back plate, an air outlet channel is formed on the back plate and the other end of the electronic equipment at the two sides of the electronic equipment, an air outlet is arranged on the subrack casing on the other side of the back plate, the electronic equipment on one side of the back plate and the electronic equipment on the other side of the back plate are arranged in an interlaced way along the height direction of the back plate and arranged to be along the direction that the air flow flows through the electronic equipment, and the electronic equipment on one side of the back plate protrudes out of the electronic equipment on the other side of the back plate. By adopting the subrack structure of the embodiment, the height and the volume of the subrack can be effectively reduced on the basis of guaranteeing the radiating effect, thereby enhancing the compactness of the electronic products.

The invention relates to a coal mining process, in particular to an under-building, under-railway and under-water mining filling process, and solves the technical problems that the recovery ratio is low and a god cannot be filled effectively in the conventional coal mining technology. The under-building, under-railway and under-water mining filling process comprises the following steps of: (a) respectively tunneling a belt air return lane and a railway air inlet lane on the two sides parallel to a coal seam to be mined; (b) tunneling a waste rock transportation and air return lane along one side of the belt air return lane; (c) performing recovery on the coal seam (9) to be mined, and simultaneously, digging a contact channel perpendicular to the waste rock transportation lane on a coal pillar between the waste rock transportation and air return lane and the belt air return lane; (d) performing coal waste rock filling operation on the gob to finish a work cycle; and (e) repeating the work cycle continuously until all gobs are filled. The under-building, under-railway and under-water mining filling process is suitable for comprehensive mechanized coal mining of large and medium-sized coal mines and high in recovery rate; waste rock is utilized reasonably; and the harmony of ecology and production in a mine area is realized.

The invention discloses an active heat dissipation type box-type substation, and the substation comprises a shell; a plurality of supporting blocks are fixedly connected to the lower end of the shell,and a mounting cavity is formed in the shell; transverse cavities are formed in the upper inner wall and the lower inner wall of the shell, and a vertical cavity is formed in the inner wall of the left side of the shell. A wind energy triggering mechanism comprises a rotating shaft which is horizontally and rotationally connected between the two inner walls of the transverse cavity, and the two ends of the rotating shaft penetrate through the inner walls of the two sides of the transverse cavity respectively, and fan blades are fixedly connected to the two ends of each rotating shaft; and anactive heat dissipation mechanism comprises a folding air bag vertically arranged in the vertical cavity, and first magnetic blocks are fixedly connected to the upper end and the lower end of the folding air bag. The substation dissipates heat through wind energy, does not need to use electric energy, is very convenient to use, can sweep dust on the heat dissipation net while dissipating heat, andavoids the situation that the heat dissipation efficiency is affected by too much dust.

The invention discloses steeply inclined coal seam strike advancing false dipping fully-mechanized coal mining. A hydraulic support, a connector, an end support, a coal mining machine, a scraper conveyer, an air way, an upper outlet, a belt transporter tunnel and a lower outlet are included. The scraper conveyer is laid in the false dipping direction. The hydraulic support is laid in the direction of a mining work face. A lag part is provided with a rock blocking device. A telescopic beam of the hydraulic support and the front end of a base are designed to be inclined edges according to false depression angles. The hydraulic support and the scraper conveyer are connected through a flat lug. The coal mining machine is installed on the scraper conveyer in a sliding mode. The end support is distributed on the lower outlet. The hydraulic support is moved from the air way to the belt transporter tunnel. The scraper conveyer is pushed as a whole, and in the moving process of the scraper conveyer, a roller of the coal mining machine is intercepted in a coal wall at the same time. The steeply inclined coal seam strike advancing false dipping fully-mechanized coal mining has the advantages that rib spalling of the coal wall is effectively controlled, a bottom plate slides, the problems about tilting prevention and sliding prevention of a steeply inclined fully-mechanized coal mining device and rock flying prevention of a goaf are well solved, production efficiency is high, safety is good, and labor intensity of workers is greatly lowered.

The invention relates to a method for planting ice grapes comprising the steps of, digging planting trenches, selecting planting trench packing filling, grapes planting, constructing vine shelf, watering the grapes, field caring and controlling the maturation period. The planted grapes contain high sugar content than the common grapes.

The invention provides cattle fattening feed, and belongs to the field of technologies for processing feed. The cattle fattening feed at least comprises, by weight, 20-100 parts of broussonetia papyrifera leaves, 10-50 parts of sugar-containing substances, 1-4 parts of mineral premix and 0.1-1 part of vitamin premix. The cattle fattening feed has the advantages that the cattle fattening feed is made of the broussonetia papyrifera leaves, the sugar-containing substances, the mineral premix and the vitamin premix, protein, vitamin and mineral elements are matched with one another in a balanced manner, accordingly, cattle fattening nutrition can be provided, excellent development of rumens can be promoted, the daily weight gain can be increased, the feeding cost can be lowered, and the slaughtering age in days can be shortened.

Provided is a distribution control device for an air quantity of a long tunnel ventilating system. A front branch pipe and a rear branch pipe of a ventilator on a parallel adit or an auxiliary tunnel portal leading to a front tunnel face and a rear tunnel face of a main tunnel are respectively provided with a front solenoid valve and a rear solenoid valve, the front solenoid valve and the rear solenoid valve are electrically connected with a control processing center, and the ventilator is also electrically connected with the control processing center. A front gas concentration detector, a front dust concentration detector, a front carbon monoxide concentration detector and a front hydrogen sulfide concentration detector which are electrically connected with the control processing center are arranged beside the front tunnel face; and a rear gas concentration detector, a rear dust concentration detector, a rear carbon monoxide concentration detector and a rear hydrogen sulfide concentration detector which are electrically connected with the control processing center are arranged beside the rear tunnel face. The distribution control device can automatically adjust and control ventilation quantity of air fed to the front tunnel face and the rear tunnel face according to pollution conditions of the front tunnel face and the rear tunnel face of the main tunnel, can simultaneously guarantee ventilation effect of the two tunnel faces and is good in ventilation effect; and energy waste is also avoided.

The invention provides a rain-proof distribution box, and belongs to the technical field of power distribution equipment. The rain-proof distribution box comprises a square box body and a plugboard, wherein static contacts and slide chutes of a plurality of electric connectors are fixed in the box body; movable contacts of the electric connectors are arranged on the plugboard; guide sliding strips coats two sides of the plugboard; the slide chutes are matched with the guide sliding strips and are fixed on the inner side wall of the box body; the plugboard comprises an upper plugboard, a middle plugboard and a lower plugboard; two portable handles are fixed on the upper end surface of each plugboard; a hand push handle is arranged at the outer end of each plugboard; a ventilating partition plate is also horizontally arranged in the box body and is located below the lower plugboard; a plurality of air holes are formed in the middle of the ventilating partition plate; a lifting rod is vertically arranged at the center of the ventilating partition plate in a penetrating manner; the upper end of the lifting rod is connected with a support block; the lower end of the lifting rod is connected with a floating plate; and the lifting rod ascends and then the air holes are completely plugged by the floating plate. According to the rain-proof distribution box, the distribution box and the outside are kept in good ventilation; and the rain-proof distribution box has good waterproofness and high safety.

The invention discloses a method for preventing goaf air leakage during soft rock crack development coal seam mining of a coal mine. The method comprises the steps that firstly, a first sealing wall is built by loess and bricks in a position with the distance being 12m from a crossheading outlet, and then, a second sealing wall is built at a space being 4m; drill holes with the space being 1m are drilled above the second sealing wall, and in addition, the spaces of the first and second sealing walls are fully filled; then, slurry filling holes are dilled in a surrounding rock loosing circle on a cross section with the distance being 3m from the crossheading outlet, surrounding rock comprises a top plate, two sides and a bottom plate, and cement slurry is filled in the surrounding rock loosing circle; and next, a third sealing wall is built on the cross section for filling the surrounding rack crack, so the cross section and a fully filled surrounding rock body are combined into a whole. The method has the advantages that through the technical scheme, the wall caving of coal walls of three soft high-crack development coal layer roadways is avoided, the hole leakage and the air leakage are not generated, and the air leakage is also avoided after the full filling of the crack of the surrounding rock loosing circle, so the normal ventilation of the whole mine is ensured.

A residence flatlet fresh air changing system provided with a double air duct pressurizing exhausting device comprises a main exhaust fan (1) and an air absorbing pipeline (2) which is communicated with all the rooms, wherein, an air outlet end of the air absorbing pipeline (2) is connected with an air inlet end of the main exhaust fan (1), and the air absorbing pipeline (2) is provided with a plurality of air absorbing holes (3) communicated with the rooms needing to change air. The fresh air changing system is characterized in that the air absorbing pipeline (2) is provided with at least one multi- air-duct pressure device (4) which is provided with two air ducts, the two ends of which are communicated with the ends corresponding to the air absorbing pipeline (2), and one of the air ducts is equipped with a blower fan (5). The invention solves the problem of installing forced fans on the air absorbing pipeline, can ensure the work of all the forced fans not to affect the air change of other rooms, and selectively pressurizes the rooms needing pressure boost according to the needs, thus ensuring the effect of air change.

The invention provides a good mattress capable of preventing dewing and dispensing, characterized in that: the thermal plasticity resin as the raw material or the main raw material melts to be extruded into lines and a large amount of lines are wounded out of order and welded into annular aggregates of the lines and the aggregates are formed into the plate-like shape and then cooled and solidified, therefore a three-dimensional net structure is formed. The left, right relatively-long side-surfaces have side-surface firmness parts with high apparent density.

An ultrasonic transducer element chip includes a substrate, a plurality of ultrasonic transducer elements, a reinforcing member and a ventilation passage. The substrate defines a plurality of openings arranged in an array pattern. The ultrasonic transducer elements are respectively disposed at the openings on a first surface of the substrate. The reinforcing member is fixed on a second surface of the substrate opposite to the first surface of the substrate to reinforce the substrate. Through the ventilation passage, internal spaces of the openings and an external space of the substrate are in communication with each other.

The automobile air conditioner air door device includes an executor, a transmission mechanism, an air door baffle, and an air intake box, and the transmission mechanism includes an executor rotation arm, a driving rack and an air door rotation arm. The air door baffle is made to switch the position between the inner air intake and the outer air intake for realizing the inside circulation and the outer circulation of the air inside the automobile to ensure the ventilation and comfort effectively. The simple structure of the transmission mechanism and the small size of the air door device result in greatly reduced size of the whole air intake. In addition, the air door baffle has self-locking effect and the air door has excellent sealing performance.