55results about How to "Solve the dead angle problem" patented technology

The present invention belongs to the field of micro algae biotechnology, and is especially one kind of closed pipeline optical bioreactor plant for large scale culture of micro algae. The optical bioreactor plant includes transparent pipeline, gas analyzing unit, auxiliary pipe system, culture parameter sensing and controlling unit and economic micro algae. The present invention adopts large gas analyzing unit, parallel connected transparent pipes, mechanically drive water flow, mutual light blocking of cells, etc. to ensure the gas exchange inside the reactor for photosynthetic metabolism, reduce oxidation damage and light damage, replenish CO2 effectively, reduce the blocking of bubble column on water flow, and raise micro algae culturing efficiency and yield. In addition, the optical bioreactor plant may be established in place with sufficient sun light to utilize natural light effectively.

An omnibearing visual transducer of blind angle free type is prepared for setting catadioptric lens at top of transparent external cover, arranging an opening at bottom center of said external cover, setting said transparent external cover on support frame, arranging video camera head on focus point of catadioptric lens and setting said catadioptric lens and transparent external cover as well as video camera head to be on the same axle coaxially.

The invention discloses an over-360-degree-angle limit sensor device, which consists of a support disc, an inner shifting rod, a slip ring, an outer shifting rod, a return spring, a slider, a steel magnet, Hall elements and a shifting block, wherein the inner shifting rod is fixed on the support disc; the outer shifting rod is fixed on the slip ring; the return spring, the slider and the steel magnet are mounted in the slip ring; a pair of Hall elements is ranged on a measured rotor part; and the shifting block is arranged on a tested stator part. When the limit sensor device provided by invention is arranged at the limit position of the null point and the terminal point of a mechanical device with a rotary angle of 360 degrees required to be detected, the rotary angle of the mechanical device successfully reaches or exceeds 360 degrees, and the available rotary angle has no mechanical dead angle generated by the physical sizes of the sensor; and thus, the quick and accurate positioning of the mechanical devices such as the antenna turntable in the horizontal direction is guaranteed.

The invention discloses a multifunctional glass cleaning robot and a control method. The multifunctional glass cleaning robot comprises a box body, an adsorption system, a walking steering system, a water supply system, cleaning systems and an automatic control system, wherein the adsorption system and the water supply system are mounted in the box body; the walking steering system and the cleaning systems are mounted at the lower part of the box body; the adsorption system comprises a three-phase motor, a pneumatic cavity, a duct and a fan blade; the walking steering system comprises four sets of wheeled structures; each set of the wheeled structures comprises a DC motor, a reducer, a wheel and a fixing plate; the water supply system comprises a crank shaft cam mechanism, and further comprises a gas guiding pipe, a water tank and a water supply guiding pipe which are connected in sequence; the cleaning systems comprise cleaning motors, bevel gears, glass brushes, glass scrapers and glass cloth; and the automatic control system comprises a central controller, an infrared remote sensor and an alarming device. The multifunctional glass cleaning robot has the advantages that the structure is simple; the carrying is convenient; the cost is low; no dead angle exists during cleaning; glass cleaning requirements of families, office spaces and the like are met; and the market application prospect is wide.

The invention discloses an Internet of Vehicles based smart city dynamic video monitoring system. The Internet of Vehicles based smart city dynamic video monitoring system comprises a cloud-end server platform and intelligent vehicle-mounted terminals; the cloud-end server runs at a data service center and is responsible for managing all the vehicles and all the video resources; each intelligent vehicle-mounted terminal is arranged on each vehicle and is used for acquiring position information of the vehicle and providing local storage, basic data analysis and driving videos; and one vehicle after provided with the intelligent vehicle-mounted terminal is in network connection with the cloud-end server platform through a wireless network. Compared with the prior art, the Internet of Vehicles based smart city dynamic video monitoring system has the beneficial effects that real-time positioning of vehicles in an urban area is realized by utilizing a vehicle positioning system in the Internet of Vehicles. When video monitoring for one area is required, dynamic video calling of the area is realized by adopting an area search algorithm to search vehicles in the target area, combining with automobile data recorders and regarding the automobile data recorders as monitoring points. Therefore, the dead angle problem of fixed-point cameras on the traffic roads is solved.

The thermosetting plastic extruding and pelletizing process includes the steps of heating, feeding, extruding, pelletizing, negative pressure sucking, cyclonic separation of aggregate, wind cooling and sieving. The said process has optimized technological parameters and thus continuous production process.

The intelligence type antenna is an antenna array composed of two antenna units and T type connector. Two radio frequency switchers are setup between one antenna unit and T type connector. There are two transmission lines between two radio frequency switchers. After two radio frequency switchers are switched, through first transmission line or second transmission line, the antenna units connected to the radio frequency switcher are connected to the T type connector so as to make information fed to the two antenna units generate difference between in-phase or out-of-phase. Thus, two antenna units are utilized at same time. Comparing with traditional antenna diversity multitasking, the invention solves disadvantages that only one antenna is utilized at same time. The invention can receive information in optimal quality.

The invention discloses a pulse water distribution device and a water distribution method for a UASB (anaerobic reactor). The device mainly comprises a motor, a motor speed reducer, a cavity, a water intake device and a water discharge device, wherein the motor conveys power to the motor speed reducer through a shaft coupler, a rotating shaft and a water distribution plate are arranged in the cavity, the water intake device injects water into the cavity, and the water discharge device discharges the water in the cavity. According to the invention, pulse water distribution is realized by a mechanical method and the water intake connection mode is optimized, thereby improving the integral water distribution efficiency and greatly reducing the failure rate of water distribution pipeline.

The invention discloses a technique process and an operation method for realizing immersive sintering of lithium ion anode and cathode materials with reaction atmosphere or reaction gas. The sintering process is suitable for a synthetic reaction under specific atmosphere, an oxidizing reaction requiring an oxygen atmosphere, a carbon cladding reaction under organic gas, and a quenching reaction requiring fast cooling of cooling gas; the defect that conventional sintering gas floats at the surface of the material is solved by whole course gas immersive sintering manner, thus greatly improving the reaction activity when the gas serves as a reaction raw material and inertia protection when the gas serves as a protection atmosphere, being favorable for meeting the preparing of lithium battery anode and cathode materials requiring the gas to participate the reaction or provide the protection atmosphere, and realizing the immersive sintering process under the gas atmosphere by particle size screening after precursor pelleting, oppositely buckling upper and lower symmetric expanded panels of an immersive sintering furnace and a smart design of the expanded panel and a venting tower.

The invention discloses a guide wheel device for a flexible guide rail, belonging to the technical field of automatic processing. The guide wheel device consists of two guide wheel mechanisms which are vertically and symmetrically arranged below a guide rail straddle, wherein the guide wheel mechanisms comprise six groups of guide wheel modules and a guide wheel support plate; the six groups of guide wheel modules are respectively fixed at two ends of the guide wheel support plate; and the guide wheel support plate is vertically and fixedly connected with the guide rail straddle. The invention provides a favorable solution for improving the flexibility of the guide rail device for the flexible guide rail and provides powerful support for improving the bearing capacity of the automatic processing equipment of the guide rail and widening the application occasions of the flexible guide rail.

The invention relates to a mixed power drive device, comprising a power input crankshaft box, an auxiliary power crankshaft box, and a power output crankshaft box; the power input crankshaft box is internally provided with a power input crankshaft flywheel group; the power input crankshaft flywheel group is provided with an input shaft and an output shaft; the input shaft is connected with a gasoline machine; the output shaft is provided with a power input bevel gear; the auxiliary power crankshaft box is internally provided with an auxiliary power crankshaft flywheel group which is provided with an input shaft and an output shaft; the input shaft is connected with a motor; the output shaft is provided with an auxiliary power bevel gear which is engaged with the power input bevel gear; the power output crankshaft box is internally provided with a power output crankshaft flywheel group which is provided with an input shaft and an output shaft; the input shaft is provided with a belt pulley; the end of the input shaft is provided with a power output bevel gear; the belt pulley is connected with a generator by transmission; the power output bevel gear is engaged with the auxiliary power bevel gear; the generator is electrically connected with an accumulator which is electrically connected with a motor.

The invention relates to a material mixing device and method and in particular relates to a device and a method for uniformly mixing scattered fine powder, belonging to the field of mechanical equipment. The device comprises a feeding device, a dust remover, a spiral discharging device and a continuous discharging mixer, wherein the feeding device comprises a storage tank, a radio frequency vacuum generator, a collection bin and a cyclone separator; the radio frequency vacuum generator is positioned on the upper part of the collection bin. According to the invention, a mixing operation is performed in a mode of alternatively combining inclined shovel tools and hollow arrow tools in the mixer, and mixed materials are high in uniformity. The device is also applied to sticky materials, and the problem of dead angle in the mixing process is solved. The mixing tools are divided into two kinds, wherein one kind of mixing tools have an inclined angle, materials are pushed to move forwards while being stirred, and the continuous discharging aim is further achieved.

The invention discloses an anti-unmanned-aerial-vehicle defense system of a vehicle-mounted paralleling networking type. The system is characterized by including more than one vehicle-mounted commanding workstation. The more than one vehicle-mounted commanding workstation are mutually connected through a wired or wireless manner, and are the anti-unmanned-aerial-vehicle defense system which uses vehicles as carriers and already completes vehicle-mounted integrated assembly. The anti-unmanned-aerial-vehicle defense system includes commanding and control work rooms arranged behind driver cabs. The commanding and control work rooms include commanding and control workbenches, detection devices, striking and disturbing devices and lifting devices. The detection devices, the striking and disturbing devices and the lifting devices are connected with the commanding and control workbenches through a wired manner. The detection devices collect information to send the same to the commanding and control workbenches. The commanding and control workbenches control the striking and disturbing devices to carry out striking or disturbing on unmanned aerial vehicle target points. The system uses thespecial vehicles as the carriers, integrates detection, commanding, control, striking and disturbing into one, and realizes zero deployment times of anti-unmanned-aerial-vehicle field application.

The present invention belongs to the field of micro algae biotechnology, and is especially one kind of closed pipeline optical bioreactor plant for large scale culture of micro algae. The optical bioreactor plant includes transparent pipeline, gas analyzing unit, auxiliary pipe system, culture parameter sensing and controlling unit and economic micro algae. The present invention adopts large gas analyzing unit, parallel connected transparent pipes, mechanically drive water flow, mutual light blocking of cells, etc. to ensure the gas exchange inside the reactor for photosynthetic metabolism, reduce oxidation damage and light damage, replenish CO2 effectively, reduce the blocking of bubble column on water flow, and raise micro algae culturing efficiency and yield. In addition, the optical bioreactor plant may be established in place with sufficient sun light to utilize natural light effectively.

The invention relates to a portable lighting and preventing device having a multimedia wireless transmission function, which is characterized in that a shell is provided with a lighting element, a photographic lens, an electric shock sheet set, a display screen, a functional key set, a mode switch and an electric shock trigger key. A control circuit module set is arranged in the shell. When using, the device has the functions of dynamic shooting and high-voltage discharge prevention. The portable lighting and preventing device having a multimedia wireless transmission function can be taken by the patrolman to shoot all the monitored positions without dead angle. In emergency, the electric shock preventing function can be started in order to scare the gangsters.

The invention discloses a drying device for Chinese herbal medicine processing. The drying device for Chinese herbal medicine processing comprises a drying chamber. A motor is installed at the bottomof the interior of the drying chamber. A disk is installed on an output shaft of the motor. A cylindrical lug is fixed to the side edge of the disk. A separation plate is fixedly arranged inside the drying chamber. A sliding rod is arranged on the top of the separation plate in a sliding penetration manner. A sieve plate is fixed to the top end of the sliding rod. A lifting base is fixed to the bottom end of the sliding rod. A strip-shaped sliding hole is formed in the side edge of the lifting base. The lug is installed in the sliding hole in a sliding manner. An annular main air pipe is installed on the top of the separation plate. The top of the main air pipe communicates with a spray pipe. An air heater is installed on one side of the drying chamber. A residue collection bucket is installed on the other side of the drying chamber. With the drying device for Chinese herbal medicine processing, the situation that dead corners often exist during traditional drying operation is avoided,the quality of the herbal medicine is improved because hot air can bring away dust in the herbal medicine, storage of the herbal medicine is facilitated, and operation is easy to carry out.

An optical bioreactor for culturing microalga is composed of concave fixing base with conic shape, supporting mesh frame, transparent plastic bag, and inlet and outlet pipelines. Its advantages are high installation stability, uniform distribution of nutrients and sufficient disinfecting and gas exchange.

The invention belongs to the field of pipe machining, and particularly relates to a continuous numerical control pipe bending machine which comprises a machining box, wherein a cutting groove is formed in the top of an inner cavity of the machining box, a vertical cutting blade is slidably connected to the top of the inner cavity of the machining box through the cutting groove, a movable sleeve arm is fixedly connected to the top end of the vertical cutting blade, auxiliary shaft rods are slidably connected to the two ends of the inner wall of the movable sleeve arm correspondingly, the rear ends of the auxiliary shaft rods are fixedly connected to the front face of the outer surface of the machining box, and thrust motors are fixedly connected to the front faces of the outer surfaces of the auxiliary shaft rods. Due to the fact that the steel pipe is bent through the torque device, the steel pipe can be machined into an annular pipe and even a bent pipe with a more special angle, the shape and the bending angle of the steel pipe are more than those of a steel pipe machined through a common pipe bending machine, and the machined pipe body flies out of the torque device under the inertia effect and is thus thrown into a collecting device beside, to complete automatic collection of the steel pipe, so that the device has continuity.

The invention discloses a method for collecting picture type file materials. The method comprises the following steps: uploading the picture type file materials; according to the uploaded picture material and a preset file material feature rule, carrying out semi-automatic data arrangement on the file material and other collected information; further integrating and organizing the temporary data subjected to semi-automatic arrangement according to the requirements of collection specifications to obtain result data needing to be collected and warehoused; and storing the result data to a database by utilizing a unified and standard data processing interface. According to the method, the configurable design and the non-relational database application are combined to realize the collection ofvarious heterogeneous picture file material data; an optical character recognition technology is introduced, and the data arrangement process of file material collection is simplified to a certain extent, and the collection efficiency is improved, meanwhile, text information of picture file materials is recognized and extracted, and the data utilization rate is increased; and a word segmentation technology and a semantic analysis technology are introduced to deeply analyze the extracted text information.

The invention discloses an intelligent anti-theft system of an unmanned supermarket. The system comprises an in-store conveying ladder and an out-store conveying ladder, wherein the in-store conveyingladder and the out-store conveying ladder are arranged in parallel, the in-store conveying ladder is located at one side of the out-store conveying ladder, and the in-store conveying ladder is provided with an in-store weighing module. According to the intelligent anti-theft system of the unmanned supermarket, the total mass of a person and a commodity when the customer leaves the store can be compared with the mass of the person entering the store and the mass of the purchased commodity so as to judge whether a customer has a stealing behavior or not; a display module is used for displayinga weight difference value when the customer enters and exits and a mass difference value between the actual weight of the purchased commodity and the weight provided by a purchase weight acquisition library; the intelligent anti-theft system gives strong deterrence to a thief while protecting personal weight information of the customers, the stealing idea of the thief is broken off from the source, the problem of monitoring dead angles is effectively solved, and the omnibearing anti-theft effect is realized; and a self-checking module can be used for comparing the total goods with the sales volume and the remaining volume of the unmanned supermarket so as to judge whether the unmanned supermarket has anti-theft negligence or not.

The invention discloses a radial flow dividing and concentrating apparatus for a water-erosion-monitored district. The radial flow dividing and concentrating apparatus comprises a flow concentrating barrel and more than one flow dividing barrel, wherein the flow dividing barrels are successively connected in series; the head-end flow dividing barrel is connected with the concentrated radial flow of the district; and the tail-end flow dividing barrel is connected with the flow concentrating barrel. The radial flow dividing and concentrating apparatus for the water-erosion-monitored district avoids the problem of existence of blind angles in the barrels, can realize faster sampling, and is more convenient to clean since a discharge opening is reserved in the bottom; flow stabilizing grids are arranged in the flow dividing barrels so as to effectively prevent the difference of multi-hole flow division caused by instability of flow rate when rainfall is large, improve flow division stability and observation precision and guarantee uniform flow velocity of water flow, and flow division holes are consistent in pore diameters and uniformly distributed at a same level, which allows higherflow division precision to be obtained; a detachable stirring device realizes rapid and easy stirring of a sample, so sampling precision is effectively improved; and the stirring device can conveniently clean residual radial flow after observation and can exert ideal effect in cleaning.

The invention discloses an automatic cleaning machine with a liftable tableware rack. According to the invention, a plurality of groups of tableware rack assemblies for bearing tableware are fixedly supported and positioned on the fixed positioning columns; simultaneous cleaning of batches of tableware can be realized; cleaning efficiency is high, cleaning spraying mechanisms fixed to a lifting driving support and a guiding support are arranged on the periphery of a tableware rack assembly. The cleaning spraying mechanism is arranged around tableware; the cleaning efficiency and the cleaning thoroughness can be effectively improved; when the tableware is cleaned, the tableware can be cleaned; the cleaning spraying mechanism sprays tableware on the tableware rack assembly; the lifting mechanism simultaneously drives the tableware rack assembly to do reciprocating lifting motion up and down within a certain amplitude; spraying and washing operation on different parts of tableware can beachieved, the spraying angle of cleaning liquid sprayed to the tableware by the cleaning spraying mechanism can be continuously changed, spraying and washing at all angles can be effectively achieved,the dead angle problem of tableware cleaning is thoroughly solved, and the thoroughness of cleaning is improved.

This invention provides an indoor monitoring system, and a method thereof. The system comprises an aircraft main body, an image capturing unit, a storing unit, a locating unit, a transmitting unit and a processing unit. The image capturing unit can capture a plurality of capturing images in an indoor space according to a capturing sequence. The storing unit can store a three-dimensional indoor map of the corresponding indoor space; the three-dimensional indoor map includes a plurality of default images and default flight paths in sequence. The locating unit can be used for generating three-dimensional spatial information of the aircraft main body. The transmitting unit can receive a control instruction or transmit each capturing image. The processing unit can drive the aircraft main body to fly in the indoor space according to the default flight paths, compare each default image and each capturing image in pairs according to the capturing sequence, and correct the positions of the aircraft main body on the default flight paths and perform indoor monitoring according to a comparison result.

The invention relates to a panoramic driving record and reversing image all-in-one machine, which is characterized by comprising a front camera group and a rear camera group. The front camera group and the rear camera group are connected with an image processing unit, and the image processing unit outputs a front 180-degree image or a rear 180-degree image; and the image processing unit is connected with a display unit via a display switch. The panoramic driving record and reversing image all-in-one machine in the invention can truly solve the problem of dead angle around the vehicle body andcan clearly reflect the condition around the vehicle body. Through processing of an image technology, the situation around the vehicle body is displayed on a screen in the car clearly and completely so as to achieve being all-round, full-angle and full-clear. Camera shooting and imaging are synchronously cooperated and can be kept high-definition, undistorted, clear, stylish and durable at night,thereby maximizing the needs of an owner. Simplicity of the display and clearness and convenience of the screen bring convenience for the owner to drive so that the driving process is not only comfortable but also safe; meanwhile, various traffic problems are quickly processed by recording the driving process in all dimensions.

The invention discloses a vortex exhaust structure of an automobile engine. The vortex exhaust structure comprises a flow regulation cylinder, wherein a gas introducing cylinder which is coaxial with the flow regulation cylinder is arranged at one end of the flow regulation cylinder; the vortex exhaust structure further comprises a cladding which is coaxially fixed outside the flow regulation cylinder; a plurality of guide plates are further mounted between the cladding and the flow regulation cylinder and twisted with the axis of the flow regulation cylinder serving as a central line in an Archimedes spiral manner, and every two adjacent guide plates form a spiral channel; and a plurality of gas distribution holes are formed in the side wall of the gas introducing cylinder. According to the vortex exhaust structure, an exhaust gas vortex is formed in the outlet of the spiral channel, so that the flowing of air flow is accelerated, dead angles in the bent position are changed into gas flowing areas, the problem of dead angles on an exhaust pipeline is solved, the exhausting is facilitated, pressure loss is avoided during low twisting of exhausting, high and middle twisting can be performed more smoothly, exhausting smoothness is improved to promote gas inlet smoothness, the burning rate of injected fuel is increased, and the fuel can be burnt and utilized for maximum efficiency.

The invention relates to a hybrid driving device, which comprises a power input crankcase, an auxiliary power crankcase and a power output crankcase. The power input crankcase is provided with a power input crankshaft flywheel set, and the power input crankshaft flywheel set is provided with input and output shafts. , the input shaft is connected with the gasoline engine, the output shaft is provided with a power input bevel gear, the auxiliary power crankcase is provided with an auxiliary power crankshaft flywheel group, and the auxiliary power crankshaft flywheel group is provided with input and output shafts, the input shaft is connected with the motor, and the output shaft is installed There is an auxiliary power bevel gear, the auxiliary power bevel gear meshes with the power input bevel gear, the power output crankshaft flywheel set is installed in the power output crankcase, the power output crankshaft flywheel set is provided with input and output shafts, and the input shaft is provided with a pulley. The end of the input shaft is provided with a power output bevel gear, the belt pulley is connected to the generator, the power output bevel gear meshes with the auxiliary power bevel gear, the generator is electrically connected to the storage battery, and the storage battery is electrically connected to the motor.

The invention relates to a flatheaded house with function of air circulation, which comprises various flatheaded houses, doors and windows and also comprises that the front wall and the rear wall inside various flatheaded houses and the lower end wall of the partition wall with no furniture inside a room of the house are respectively provided with a parallel transverse port having a wind retaining strip, which is communicated with the inside and the outside of the room; except the partition wall of the room of the kitchen, the front wall, the rear wall and the wall on the lower side of the roof of the vertical part of each transverse port of the lower end of the partition wall of other rooms are provided with a parallel transverse port having a wind retaining strip, which is communicated with the inside and the outside of the room through a notch dug by the roof near the wall; except the kitchen, the outside of each notch of the roof is provided with a retaining plate or a runner which can be pushed to cover the notch or pushed away to expose the notch; and the transverse port at the lower end of the partition wall of the room can be staggered with the vertical line of the transverse port at the upper end and is arranged at the lower end of a partition door. The flatheaded house has the advantages that the flatheaded house promotes the room to be cool in summer and warm in winter and the circular convection of fresh air, discharges exhaust gas and water vapor in the kitchen, prevents coldness and heat stroke, occupies no or less energy, reduces the harm of the urban heat island effect and is environment-friendly and favorable for human health.

The invention provides a sand blasting device and method for surface post-treatment of a cast valve body, and relates to the field of valve body surface treatment. The sand blasting device comprises a rotary table installed in a working cabin and provided with a clamp used for clamping a workpiece, a sand blasting mechanism comprising a plurality of sand blasting branches respectively communicated with the sand blasting supply mechanism, and a sand blasting support, wherein the output ends of the sand blasting branches are respectively connected with sand blasting nozzles; the sand blasting support is installed on a three-axis movement mechanism, the sand blasting support is provided with a plurality of cantilever rods which are arranged at included angles, and the sand blasting nozzles are installed at the tail ends of the cantilever rods in a one-to-one correspondence mode; when the rotary table and / or the three-axis movement mechanism act, the sand blasting nozzles can conduct sand blasting on the outer surface of a workpiece and / or extend into the workpiece to conduct sand blasting on the inner surface; and sand blasting is conducted on the inner surface of the workpiece, the three-axis movement mechanism drives the sand blasting support to move, the sand blasting support feeds the sand blasting nozzles at the tail ends of the cantilever rods into the workpiece to be subjected to sand blasting machining, the action range covers the inner wall of the workpiece, and the requirement for comprehensive sand blasting of the workpiece is met by combining sand blasting of the outer wall of the workpiece when the sand blasting nozzles are located outside the workpiece.

The invention relates to a flatheaded house with function of air circulation, which comprises various flatheaded houses, doors and windows and also comprises that the front wall and the rear wall inside various flatheaded houses and the lower end wall of the partition wall with no furniture inside a room of the house are respectively provided with a parallel transverse port having a wind retaining strip, which is communicated with the inside and the outside of the room; except the partition wall of the room of the kitchen, the front wall, the rear wall and the wall on the lower side of the roof of the vertical part of each transverse port of the lower end of the partition wall of other rooms are provided with a parallel transverse port having a wind retaining strip, which is communicated with the inside and the outside of the room through a notch dug by the roof near the wall; except the kitchen, the outside of each notch of the roof is provided with a retaining plate or a runner which can be pushed to cover the notch or pushed away to expose the notch; and the transverse port at the lower end of the partition wall of the room can be staggered with the vertical line of the transverse port at the upper end and is arranged at the lower end of a partition door. The flatheaded house has the advantages that the flatheaded house promotes the room to be cool in summer and warm in winter and the circular convection of fresh air, discharges exhaust gas and water vapor in the kitchen, prevents coldness and heat stroke, occupies no or less energy, reduces the harm of the urban heat island effect and is environment-friendly and favorable for human health.