28results about How to "Increase the ventilation area" patented technology

The invention discloses a tooth splicing type high-voltage and high-speed motor stator and a design method, the tooth splicing type high-voltage and high-speed motor stator comprises a stator yoke and stator teeth, the stator teeth are uniformly distributed along the inner circumference of the stator yoke, and a stator slot for installing a winding is formed between adjacent stator teeth; the stator teeth are of an axisymmetric structure, the side edge of each stator tooth comprises a first contour molded line, a second contour molded line, a third contour molded line and a fourth contour molded line which are sequentially arranged in the radial direction of the stator, and the first contour molded lines of the adjacent stator teeth form winding installation areas. According to the invention, the stator teeth are designed to be detachable through the splicing structure, the line insertion of the formed winding can be smoothly carried out in the winding installation area formed by the first contour molded line, the groove width of the customized teeth can be ensured, and the stator teeth can be conveniently inserted in the winding installation area formed by the first contour molded line. The cogging torque is reduced, and the rotor eddy current loss of the motor is reduced.

The invention provides a water supply control method and device, clothes treatment equipment and a storage medium, and the method comprises the steps that first water supply treatment and second water supply treatment are executed based on a clothes treatment instruction, and the first water supply treatment is located before and / or after the second water supply treatment, the first water supply treatment comprises the step of supplying water to a clothes containing device of the clothes treatment equipment through a first water supply pipeline, the first water supply pipeline communicates with the clothes containing device through an air outlet channel of the clothes treatment equipment, and a filter screen used for filtering airflow in the drying treatment process is arranged in the air outlet channel; the second water supply treatment comprises supplying water to the clothes accommodating device through a second water supply pipeline, and the second water supply pipeline is communicated with the clothes accommodating device through a clothes treating agent box of the clothes treating equipment. According to the technical scheme, the filter screen is cleaned before and / or after water is supplied for clothes treatment, the ventilation area of the filter screen is increased, and the drying effect in the clothes treatment process can be effectively improved.

The utility model discloses four-season universal riding sport pants, and relates to the technical field of riding equipment. In the breathable pants body, the front surface of a pants body part is provided with a first breathable hole structure and a second breathable hole structure which are vertically arranged at an interval, the first breathable hole structure extends to the corresponding knee position of the pants body part from the upper end of the pants body part, and the second breathable hole structure extends to the corresponding knee position of the pants body part from the pants leg position of the pants body part. The rear surface of the trouser body part is provided with a third air hole structure extending from the trouser leg position of the trouser body part to the middle crotch line position of the trouser body part. The windproof trouser body sleeves the breathable trouser body to shield all the breathable hole structures, the upper end of the windproof trouser body is connected with the bottom of the trouser waist part through a first zipper, and the outer surface of the windproof trouser body is a waterproof surface; the breathable pant body is sleeved on the warm-keeping pant body, and the upper end of the warm-keeping pant body is connected with the bottom of the pant waist part through a second zipper. The utility model has good ventilation, heat dissipation, waterproof and windproof effects and good wearing comfort, and can be used in four seasons.

The utility model relates to the technical field of composite screen cloth, and discloses high-breathability composite screen cloth which comprises a skin-friendly layer, a sweat absorption layer, a screen cloth layer, a supporting layer, an elastic layer, a breathable layer and a wear-resistant layer which are sequentially arranged from bottom to top. The supporting layer is provided with a plurality of uniformly distributed supporting blocks; a plurality of supporting columns are arranged on the supporting layer at intervals; the supporting column penetrates through the elastic layer, and the two ends of the supporting column abut against the breathable layer and the screen cloth layer respectively; the supporting column is provided with a transverse air channel, the supporting column is further provided with a plurality of vertical air channels vertically communicated with the transverse air channel, the vertical air channels penetrate through the two ends of the top and the two ends of the bottom of the supporting column, through holes are formed in the positions, corresponding to the supporting column, of the skin-friendly layer, and air holes are formed in the positions, corresponding to the supporting column, of the wear-resisting layer. The breathable antibacterial fabric is good in breathability and has antibacterial performance.

The utility model discloses a ventilation module of a tank container and the tank container, comprising a ventilation pipe connected to a ventilation port of the tank container; the ventilation head is arranged at one end, far away from the ventilation opening, of the ventilation pipe; the ventilation head is provided with a head pipe body connected with the ventilation pipe, a cover body covering the upper end of the head pipe body and a filter screen located in the head pipe body. The cover body is provided with an upwarp part located on the periphery, and a ventilation opening is formed between the upwarp part and the head pipe body. When the volume of an oil product in the tank box changes, air can enter and exit from the tank box through the vent pipe via the vent hole of the vent head, so that the balance of air pressure inside and outside the tank box is effectively maintained, and the problems of tank box deformation, difficult oil inlet or unsmooth oil outlet caused by abnormal air pressure are avoided; and safe and stable operation of the tank is ensured. The filter screen is arranged in the ventilation head, dust, impurities and other particles in air can be filtered out in the process that the air enters and exits the tank box, the particles are prevented from entering the tank box to pollute oil products, the quality of the oil products is guaranteed, and the impurities are prevented from damaging oiling equipment and oiled machinery.

The invention relates to the technical field of humic acid fertilizer preparation, in particular to a humic acid fertilizer preparation method and equipment, the equipment comprises a bottom plate and a pile body box for containing pile body raw materials, a material turning mechanism is arranged above the bottom plate, the material turning mechanism comprises a transverse seat, two electric telescopic rods are fixedly connected to the bottom of the transverse seat, and the bottom of the transverse seat is fixedly connected with the bottom of the electric telescopic rods. L-shaped plates are fixedly connected to the output ends of the electric telescopic rods, rotating rods are rotationally connected to the inner walls of the sides, away from each other, of the two L-shaped plates, and a cylinder is fixedly connected to the rear end of the rotating rod on the front side. In the fermentation process, pile raw materials can be turned over and ventilated in time, the pile raw materials can be forcibly filled with air in the turning-over process through the turning-over plate, gaps of the pile raw materials can be filled with the air, the compactness of a pile is reduced, and the fermentation efficiency is improved. The ventilation effect, the ventilation area and the ventilation area in the raw materials of the pile body are greatly increased, the materials can be uniformly fermented, and the fermentation efficiency is improved.

The utility model relates to the technical field of clothes processing equipment, in particular to a fan and drying equipment comprising the fan, and aims to solve the problem that an existing fan is poor in air outlet uniformity. Therefore, the fan comprises a volute, an impeller and a motor, the impeller is arranged in the volute, the motor is used for driving the impeller to rotate, an exhaust inlet and an exhaust outlet are formed in the volute, the exhaust outlet comprises a first edge and a second edge which are oppositely arranged in the first direction, the first direction is perpendicular to the axial direction of the fan, and the second direction is perpendicular to the axial direction of the fan. The first edge in the first edge and the second edge is closer to the rotating axis of the impeller, and the cross section of the first edge is in the shape of a circular arc which is arched towards the direction close to the second edge. The first edge of the air outlet of the fan is arranged to be the arc surface, so that the air resistance is reduced, and the air outlet uniformity of the fan is improved.

This utility model discloses a biomimetic breathable flowerpot, relating to the field of flowerpot technology. It includes a pot body with side walls and multiple circumferentially oriented air vents. A honeycomb biomimetic drain tray is located at the bottom of the pot body, with multiple honeycomb drain holes and honeycomb air guide holes on its sidewalls. A biomimetic base is located at the bottom of the honeycomb biomimetic drain tray, including a base side wall with multiple circumferentially oriented drainage holes. An air vent adjustment mechanism is located at the top of the biomimetic base and is fitted onto the outside of the honeycomb biomimetic drain tray. This utility model, by incorporating a honeycomb biomimetic drain tray, achieves both rapid drainage and efficient air permeability while maintaining structural stability. The hexagonal honeycomb structure of the honeycomb possesses the characteristics of "high strength, lightweight, and porosity," resulting in good uniformity of airflow within the pot, increased air permeability, and significantly improved drainage speed.

The embodiment of the utility model relates to a gas thermal desorption device and a gas collection thermal desorption system. The gas thermal desorption device comprises a heating structure, a sleeve and a supporting piece, the supporting piece is provided with a supporting face for supporting the sleeve, the sleeve is erected on the supporting face, and a heat dissipation space is formed between the sleeve and the bottom wall of the supporting piece. The sleeve is provided with a containing cavity used for containing an adsorption pipe for adsorbing sampling gas. The heating structure is located in the containing cavity and wraps and is attached to the outer wall face of the adsorption pipe so as to heat the sampling gas in the adsorption pipe. In other words, the heating structure is matched with the adsorption tube in a direct heat transfer manner, so that the adsorption tube is rapidly heated by the heating structure, the sampling gas adsorbed in the adsorption tube is rapidly heated, and the heating efficiency is improved. Meanwhile, a heat dissipation space is formed between the bottom walls of the sleeve supporting pieces, so that the ventilation effect of the sleeve supporting pieces is improved, heat is rapidly released outwards, and rapid cooling of the adsorption pipe is achieved.

The utility model relates to an integrated ventilation valve for an automobile electric control device, which comprises a top cover, a base and a ventilation film, the ventilation film is arranged between the top cover and the base, a ventilation hole is opened and closed in the middle of the base, a cross-shaped supporting plate is arranged in the middle of the ventilation hole, and pins are uniformly distributed on the outer circumference of the lower surface of the base. The lower ends of the pins are provided with fixing blocks protruding outwards. A fixing boss is arranged on the outer side of the upper end of the base, a fixing groove capable of being matched with the fixing boss is formed in the top cover, and the breathable film is installed between the upper surface of the fixing boss and the upper top wall of the fixing groove in a pressed mode. The top cover and the base are integrally formed, and the breathable film is implanted in the forming die, so that the processing period is short, and the cost is low; the cross-shaped supporting plate can better support the breathable film and prevent foreign objects from easily puncturing the breathable film; the ventilation surface area of the ventilation film can be increased through the grooves and the ventilation grooves in the cross-shaped supporting plate; and the ventilation valve is more convenient to install through the guide columns.

The utility model relates to the technical field of bolts or fixed connection devices which are used for wing sashes and specially suitable for doors or windows, and discloses a push-pull type broken bridge aluminum alloy window which comprises a window frame, two lower sliding clamping grooves are integrally formed in the bottom wall of the window frame, and the two lower sliding clamping grooves are arranged in a left-right mode. Two upper sliding clamping grooves are integrally formed in the top wall of the window frame, the two upper sliding clamping grooves are arranged left and right, two sliding frames are slidably connected to the interior of the window frame, lighting glass is fixedly connected to the inner surfaces of the two sliding frames, the two sliding frames are symmetrically arranged front and back, and the front sliding frame and the rear sliding frame are arranged left and right. Sealing gaskets are fixedly connected to the front wall and the rear wall of the window frame, rotating mechanisms are arranged in the two sliding frames, in this way, the two glass windows are opened when rapid ventilation is needed, then the ventilation area of the push-pull type broken bridge aluminum alloy window is increased, and then the ventilation efficiency is improved.

A gauge pressure sensor comprises a housing with a mounting cavity formed inside, the housing comprises a lower housing and a cover body buckled on the lower housing, and the lower housing and the cover body are in sealed connection; the lower shell is provided with a medium guide hole for guiding a medium to be detected into the mounting cavity; a ventilation channel communicated with the environment is formed in the cover body, so that the mounting cavity is communicated with the environment; the pressure sensitive element is hermetically plugged in the medium guide hole so as to receive the pressure of the medium to be measured and generate a corresponding electric signal; the inner surface of the cover body integrally extends downwards to form the rib plate, and one end of the inner side of the ventilation channel is communicated to the mounting cavity from at least one mounting surface formed on the surface of the rib plate; the at least one first waterproof breathable film is correspondingly adhered to the mounting surface; the rib plate is arranged, and the first waterproof breathable film is also attached to the mounting surface of the rib plate, so that the structural strength of the cover body is enhanced, and a better waterproof effect is achieved.

The utility model discloses a kind of CANopen master station conversion profinet gateway's device, including gateway main body, heat dissipation component is arranged on the bottom wall of the gateway main body, the heat dissipation component includes the through cavity being opened on the bottom wall of the gateway main body, both ends in the through cavity are equipped with winding box.Affinity effect is in that: the utility model is equipped with heat dissipation component, during the use of gateway main body, servo motor drives screw rotation, and then make movable plate reciprocatingly move in through cavity under the action of screw block and guide block, on the one hand, the position of radiating fan can be changed, and then increase its heat dissipation range, on the other hand, two sides screen window net can be stretched or compressed, and screen window net can be always laid in through cavity under the action of winding shaft and scroll spring, and then increase its ventilation area, the combination of both, gateway main body inside can be efficiently heat-dissipated, guarantee its heat dissipation effect and use performance.

The utility model discloses a heat dissipation structure of an industrial personal computer, which relates to the technical field of heat dissipation of the industrial personal computer and comprises a main body, a filter box fixedly connected to the side wall of the main body, a first heat dissipation plate clamped on the inner wall of the filter box, a connecting box fixedly connected to the top of the main body, and a thermal expansion block fixedly connected to the inner wall of the connecting box, a sliding plate is slidably connected to the inner wall, located on the left side of the thermal expansion block, of the connecting box; according to the heat dissipation structure of the industrial personal computer, when the interior of a main body is overheated, a thermal expansion block is heated to expand and guide and extrude a sliding plate to slide towards the left side of a connecting box, meanwhile, a sliding column triggers a controller on the side wall of a control motor, the control motor drives a rotating shaft to rotate at the moment, the rotating shaft drives fan blades on the side wall of the rotating shaft to rotate, and the fan blades rotate to generate wind power; and the ventilation capacity of the second heat dissipation plate and the first heat dissipation plate is improved, so that rapid exchange of gas inside and outside the main body is completed, and the heat dissipation effect is achieved.

This utility model relates to the field of black goat breeding technology and provides a sheep pen environment monitoring and adjustment device for black goat breeding. It includes a base plate, a support frame welded to the top of the base plate, a protective net connected between the support frames, a roller shutter assembly connected to the top of the support frames, and a reinforcing rod connected to one side of the protective net. In this utility model, based on the roller shutter adjustment function, a stable escape-prevention barrier is constructed through the coordinated design of the protective net and the reinforcing rod. The protective net is tightly connected to the support frames on all four sides, forming a fully enclosed protective space. Furthermore, the reinforcing rod horizontally reinforces the protective net structure, improving the overall impact resistance. This design completely eliminates concerns about the sheep running away when the roller shutter is opened to adjust the environment, eliminating the need for breeders to spend time driving and penning the sheep before adjusting the environment. This saves labor costs and ensures that the environmental adjustment action can be initiated at any time, greatly facilitating user operation.

The present invention discloses a dust-proof cutting device for processing wooden fire doors, including a stand and a slide, wherein the stand is provided with a regulating component; the support arm is rotatably connected with a receiving shell, an air hood is provided on the outer side of the stand, an electric saw blade is installed in the air hood, a pumping air mechanism is installed at the bottom of the receiving shell, and an air transmission component is connected between the air hood and the receiving shell; a driving component is installed on the support arm, and a transmission component is provided on the stand. In the present invention, firstly, when the fire door passes through the gap between the air hood and the receiving shell, a flexible brush contacts the upper and lower end faces of the wooden fire door, thereby preventing wood dust from floating outward through the gap; secondly, through the coordinated arrangement of the driving component and the transmission component, the wooden dust accumulated in the receiving shell is dumped, thereby facilitating the rapid and efficient cleaning of the dust, and meeting the requirement of effectively controlling the generated dust when processing a batch of wooden fire doors.

A multi-span greenhouse with an openable, pointed roof includes: a roof forming the pointed roof, a transmission mechanism, and a greenhouse frame. The transmission mechanism includes: a window-opening motor, a window-opening gear, a window-opening rack, and a window-opening arm. The greenhouse frame includes: gutters for drainage and trusses supporting the pointed roof. At least partially, each side of the pointed roof is provided with an openable / closable skylight that is linked to the window-opening arm. The shaft end of the window-opening arm is hinged to the gutter. The window-opening motor is fixedly mounted on the truss. The output end of the window-opening motor is connected to the window-opening gear, which meshes with one end of the window-opening rack. The other end of the window-opening rack is connected to the window-opening arm. The advantages are that the greenhouse roof can be opened, providing natural light for crop growth, greatly increasing the ventilation area, and quickly removing hot and humid air from the greenhouse, achieving rapid air exchange between the inside and outside of the greenhouse.

The invention provides a magnetic device and power equipment, and relates to the technical field of heat dissipation. The magnetic device comprises a magnetic core, the magnetic core comprises a middle column and a bottom wall, and one end of the middle column is connected with one side of the bottom wall. The middle column comprises a groove, the groove is sunken in the direction from the circumferential side face of the middle column to the axis of the middle column, and the groove penetrates through the middle column in the axial direction of the middle column. The bottom wall comprises a through hole, the through hole penetrates through the bottom wall in the axial direction of the middle column, and the through hole communicates with the groove. According to the magnetic device, the groove and the through hole which are communicated in the axial direction of the middle column are formed between the middle column and the bottom wall, the air channel in the axial direction of the middle column can be formed in the contact area of the middle column of the magnetic core and the coil, and therefore heat dissipation of the magnetic device can be achieved through circulation of air in the air channel; the heat dissipation efficiency of the magnetic device can be improved, and the performance of the power equipment applying the magnetic device can be further improved.

This invention discloses a wig fiber curling, styling, and drying production line, comprising a dual-station switching winding device, a belt conveyor heat setting device, and two vertically connected series drying boxes arranged from left to right. The invention first winds the fiber bundles onto anti-slip curling and styling tubes, then places the anti-slip curling and styling tubes into the assembly line-style belt conveyor heat setting device for hot steam styling. Finally, several anti-slip curling and styling tubes are connected in series and placed into the vertically connected series drying box for batch drying. After drying, the fiber bundles are removed from the anti-slip curling and styling tubes to form curled wig bundles. The drying process employs negative pressure extraction + positive pressure air supply, with high-temperature air drying the wig bundles from the inside out of the anti-slip curling and styling tubes. This results in faster and more uniform drying of the wig bundles, controllable temperature and humidity, and prevents the wig bundles from tangling together when removed after drying.

The utility model discloses a vehicle-mounted skylight combination structure and a vehicle, the vehicle-mounted skylight combination structure comprises a roof frame assembly, and a skylight is arranged on the roof frame assembly; the front glass assembly, the middle glass assembly and the rear glass assembly cover the skylight, and the front glass assembly, the middle glass assembly and the rear glass assembly are sequentially arranged in the length direction of the roof frame assembly; the middle glass assembly and the rear glass assembly are movably arranged on the skylight so as to open or close the skylight; the first guide rail assembly and the second guide rail assembly are distributed on the two sides of the car roof frame assembly in the width direction of the car roof frame assembly. The problems that the opening size of a traditional vehicle-mounted skylight is limited, and light transmission of a vehicle roof and ventilation in a vehicle are not facilitated are solved.

The utility model discloses a dust removal device for zinc oxide, which comprises a dust removal box body and a sucking pump, the sucking pump is arranged on one side outside the dust removal box body, a purification box body is arranged inside the dust removal box body, the other side of the dust removal box body is fixedly connected with a dust suction pipe in a penetrating manner, and one end of the purification box body is connected with the top of the sucking pump. A corrugated round pipe is arranged on one side of the purification box body, a dust collection cover is arranged at one end of the corrugated round pipe, an abutting cover, a scraping strip, a splitting cover, an impurity filtering net, a threaded rod and a clamping ferrule are arranged, a cloth bag filter is arranged in the purification box body, after an air suction pump is started, waste gas containing zinc oxide can be sucked into the purification box body through a dust suction pipe, and the waste gas containing zinc oxide can be purified. The impurity filtering net is gradually attached to the scraping strips, and the scraping strips are embedded into the surface of the impurity filtering net, so that impurities blocked on the surface of the impurity filtering net can be pounded out, the ventilation area of the dust collection cover is increased, and the dust removal speed of waste gas containing zinc oxide is increased.

The utility model discloses high -precision stranding machine brake device belongs to stranding machine brake device technical field, and it includes servo motor, and servo motor output fixedly connected with the connection protection structure, one side wall center of connection protection structure is equipped with flange, and the inside center of flange is equipped with the connection rotation structure, and the front end of connection rotation structure surface is equipped with brake structure, in addition, the utility model discloses, and the elastic pad is closely attached first brake disc and produces frictional resistance through hydraulic telescopic link, and the synchronous compression is extended through compression spring along with telescopic link, and the stable additional pressure is formed through the elastic potential superposition, and the evenness and stability of brake friction force are strengthened, and can buffer the instantaneous pressure fluctuation of hydraulic system, avoid the brake precision deviation or component wear and tear caused by rigid impact, realize the accurate adjustable of brake intensity and the smooth controllable of brake process, satisfy the strict demand of high -precision stranding machine to brake response speed and speed control error.

The utility model discloses an air duct assembly and an electrical cabinet. The air duct assembly comprises a first housing and a second housing. The first shell is provided with a first air duct; the second shell and the first shell are arranged in the first direction, and the second shell is provided with a second air duct; the second shell is suitable for being matched with the first shell so that the first air channel can communicate with the second air channel. The second shell at least protrudes relative to one surface of the first shell so as to guarantee the heat dissipation effect or be conveniently connected with other elements, the second shell is further suitable for being separated relative to the first shell, so that the elements are allowed to be mounted or dismounted in the first direction, only the second shell needs to be separated from the first shell, the first shell does not need to be dismounted, and the mounting and dismounting efficiency is improved. Therefore, the maintenance is more convenient.

The utility model discloses a kind of lateral capacity expansion's lactation bra, including bra body. The bra body includes bra cup part and lower circumference;The first capacity expansion structure and second capacity expansion structure are arranged at the joint of bra cup part and lower circumference, the first capacity expansion structure extends from top to bottom along the left side of the first cup, the second capacity expansion structure extends from top to bottom along the right side of the second cup;Each capacity expansion structure includes sequentially arranged first connecting part, second connecting part and third connecting part, first connecting part is connected with second connecting part by first elastic capacity expansion sheet, second connecting part is connected with third connecting part by second elastic capacity expansion sheet;Each the elastic capacity expansion sheet is the mesh structure of breathable capacity expansion;Each elastic capacity expansion sheet is stretched transversely to deform to increase the capacity of bra cup part. The setting of each the capacity expansion structure is favorable to meet the demand of lactation period female to bra capacity, while avoid the chest compression problem brought by unreasonable direction capacity expansion.

The application discloses a MEMS waterproof microphone, comprising: a substrate comprising a first area provided with a sound hole; a waterproof air-permeable film attached to the first area and covering the sound hole; a metal pad provided with a through hole and stacked above the waterproof air-permeable film; and a MEMS chip stacked above the metal pad; wherein the aperture of the sound hole is larger than the aperture of the through hole. The application uses the metal pad as a transfer intermediate, which can increase the size of the sound hole of the substrate and the air-permeable area of the waterproof air-permeable film without being affected by the size of the chip. The larger sound hole and air-permeable area can reduce the obstruction to the sound signal, provide a higher signal-to-noise ratio, and achieve good waterproof performance, thereby improving the comprehensive performance of the MEMS microphone.

The present invention relates to the technical field of wireless transmitting equipment, and specifically discloses a connection port for wireless transmitting equipment inside a building, including a port body for connecting a network cable, wherein the port body is arranged on the shell of a wireless transmitting component, and the wireless transmitting component is located inside a box. The present invention can wrap up the excess length of the network cable through a sleeve to avoid arranging a long network cable indoors, thereby reducing the probability that people moving around will accidentally be involved in the network cable. When the network cable arranged indoors and located outside the box is pulled away from the box by an external force, the external pulling force can be buffered by a cable binding mechanism and a buffer mechanism, thereby avoiding the network cable located inside the box from being pulled, and further avoiding the network cable connector inside the box from being pulled, thereby avoiding the network cable connector connected to the port body from being loosened, and avoiding the disconnection between the network cable connector and the connection port body, which is beneficial to the use of the wireless transmitting equipment.

The utility model provides a kind of explosion venting device, energy storage cabinet and energy storage system.The energy storage cabinet has energy storage cabinet board, the energy storage cabinet board is provided with explosion venting port, the explosion venting device includes: exhaust component, including fan and exhaust passage, the fan is used to be discharged to outside by the exhaust passage with the combustible gas in the energy storage cabinet;Explosion venting component, including explosion venting board, the explosion venting board can be at least partially separatedly cover on the explosion venting port, it can be opened by combustible gas when the combustible gas pressure in the energy storage cabinet is higher than predetermined value and at least partially separated with the energy storage cabinet board.According to the explosion venting device of the utility model, both can actively discharge the combustible gas generated after heat runaway to reduce the risk of cabinet explosion, and can open explosion venting board by using shock wave to vent when explosion occurs.

The invention discloses a ventilation system for a centralized grain storage granary, the centralized grain storage granary comprises a plurality of grain storage units, the bottoms of the grain storage units are provided with square cones, and the grain storage units are communicated with one another; the ventilation system comprises ventilation ring pipes arranged below the grain storage units, U-shaped ventilation pipes arranged on the conical surfaces of the square cones and at the intersections of the adjacent conical surfaces, and ventilation cages arranged at the intersections of the granary walls and the conical surfaces, the U-shaped ventilation pipes are communicated with the ventilation ring pipes, part of the U-shaped ventilation pipes are communicated with the ventilation cages, and the ventilation cages between the adjacent granary walls are communicated. Air outlet holes for ventilating the grain storage units are formed in the surfaces of the U-shaped ventilation pipes and the surfaces of the ventilation cages, a fan, a refrigerating device and a ventilation mother pipe which are communicated in sequence are arranged below the centralized grain storage barn, and the ventilation mother pipe is communicated with all the ventilation ring pipes in the barn. The ventilation cages are communicated to form the annular ventilation duct surrounding the whole grain storage bin, so that the refrigeration and ventilation effects in the grain storage bin are enhanced; and all the grain storage units share one fan, so that the ventilation cost of the centralized grain storage barn is reduced.