51results about How to "Improve ventilation efficiency" patented technology

This utility model relates to the field of duct technology, specifically to a duct with adaptable connectors, including a duct body. Connector 1 and connector 2 are fixed to both ends of the duct body. Connector 1 has an integrally formed alignment plate on its surface, and connector 2 has an alignment slot on its surface. When two sets of duct bodies are assembled end-to-end, the beneficial effect is that by providing connector 1 and connector 2 at both ends of the duct body, with connector 1 having an integrally formed alignment plate and connector 2 having an alignment slot, the alignment plate is inserted into the alignment slot during assembly. Since the alignment plate is annular and the alignment slot is annular, this structure ensures accurate alignment of the two sets of duct bodies, avoiding misalignment during assembly, thereby ensuring uniform airflow distribution in the ventilation system, reducing ventilation resistance, and improving ventilation efficiency.

This utility model relates to the field of fire ventilation technology, and solves the problem that with the increase of usage time, some dust remains on the surface of the protective cover, blocking the ventilation holes and affecting ventilation efficiency. Furthermore, some dust remains on the inner wall, causing inconvenience for later cleaning and further affecting the ventilation quality of the duct. Specifically, it is a fire ventilation device, including a duct. A fan is installed inside one end of the duct, and a dustproof net is installed at the other end. A threaded cylinder is fixedly connected to the back of the fan. A threaded rod is threadedly connected inside the threaded cylinder. One end of the threaded rod is provided with a connector and a cross plate. The cross plate has symmetrically formed grooves at its four corners and a connecting strip embedded inside. A flexible scraper is installed inside the connecting strip and contacts the dustproof net. An electric telescopic rod is provided on the side of the duct, and an arc-shaped groove is formed at its telescopic end. A clamping plate assembly is provided in the middle of the side of the duct, and a fixed plate is movably connected inside it.

The application provides an underground engineering intelligent ventilation control device, an environment sensing unit comprises environment monitoring sensors for collecting environment parameters in real time, the environment monitoring sensors are arranged in key areas of the underground engineering and on a patrol robot that patrols in the underground engineering; a ventilation execution unit comprises a fan group with variable frequency speed regulation and fresh air / return air equipment arranged in the underground engineering; a central intelligent control unit is connected with the environment sensing unit and the ventilation execution unit, receives and processes data of the environment sensing unit and sends control instructions to the ventilation execution unit; a man-machine interaction unit is connected with the central intelligent control unit and monitors the entire underground engineering intelligent ventilation control device. Comprehensive, rapid and automatic response to underground complex environment risks can be realized, and the efficiency and safety of ventilation are greatly improved; meanwhile, precise on-demand ventilation can be realized, and energy consumption and operation cost are significantly reduced.

The utility model relates to electronic technology technical field, concretely is a kind of electronic technology with PCB circuit board dust removal device, including box, the inside of box is provided with collection component, the collection component includes blast box, blast box fixedly connected in the top of box, the inside fixedly connected with fan of blast box.This kind of electronic technology with PCB circuit board dust removal device, by adding collection component, blast box contains isolation film when fan blows inside, can insulate external pollution, and power column connects positive pressure rod, negative pressure tank connects power supply negative pressure, constitutes electric field in fan blows dust on PCB circuit board into negative pressure tank due to electric field, dust will be adsorbed and collected by both sides of negative pressure tank, filter screen can filter and ventilate and improve ventilation efficiency, after power off, dust in both sides of negative pressure tank falls into collection tank under the action of gravity and is collected, by reducing negative pressure fan energy consumption, improve environmental protection, also prolong the service life of collection tank.

This invention discloses a molten salt pump with a bearing cooling system, belonging to the technical field of high-temperature molten salt pumps. It includes: a pump body, a pump shaft, a frame, a bearing housing, a cooling device, and a support frame. The pump body is mounted on the frame; the frame is mounted on the top of the pump body, and the bearing housing is mounted within the frame. The pump shaft is rotatably connected to the bearing housing via bearings. The cooling device is installed inside the bearing housing, with multiple microchannel coils respectively fitted onto the outer surface of the bearing. A flywheel energy storage device is installed inside the bearing housing, driving ambient air to enter through the air inlet and generating a forced airflow that blows across the cooling end of the cooling device for heat exchange. The cooling end of the cooling device is connected to a cold air inlet pipe, which is connected to multiple microchannel coils, and all microchannel coils are connected to an outlet pipe. An outlet is provided at the bottom of the bearing housing, and the outlet pipe is connected to the outlet. This invention miniaturizes and integrates a compressor-free cooling device into the bearing housing for active phase change cooling, extending the lifespan of the molten salt pump.

This utility model discloses an underground civil defense ventilation structure for ventilation of underground civil defense facilities. It includes: several sets of ventilation pipe assemblies installed between the underground wall and the outside wall for ventilation of the underground civil defense facilities; each ventilation pipe assembly consists of an inner air module, a connecting pipe, and an outer air module. One end of the connecting pipe is connected to the inner air module, and the other end is connected to the outer air module; one end of the inner air module is connected to the underground civil defense facility, and the other end is connected to the connecting pipe; one end of the outer air module is connected to the external space of the underground civil defense facility, and the other end is connected to the connecting pipe; an outer air duct is installed on the outer air module, and at least two outer air branch pipes are installed on the outer air duct. One end of each outer air branch pipe is connected to the outer air duct, and the other end is connected to the external space of the underground civil defense facility. This solves the problems of ventilation efficiency and airflow control in underground civil defense passage structures.

The utility model provides a kind of intelligent fresh air system for pasture, including base, the top of base is equipped with fresh air machine, further include with the gas monitoring mechanism of the intercoordination of the fresh air machine, the fresh air machine includes body, the sidewall of the body is equipped with frequency conversion fan and first delivery pipeline.The utility model is provided with the setting of gas monitoring mechanism, controller and frequency conversion fan, can monitor the air quality in pasture in real time during use, and data transmission is given to controller, then the speed of frequency conversion fan is intelligently controlled by the data of monitoring, reduce air volume when environment is good, reduce energy waste, when air pollution is over standard, automatically promote ventilation efficiency, without artificial continuous duty, can reduce manpower cost, improve management efficiency, also can avoid the deterioration of environment caused by artificial intervention lag.

This utility model relates to the field of boiler secondary air duct technology, and discloses a boiler secondary air duct with adjustable air volume. The duct includes a secondary air duct with a damper plate fixedly connected to one side. A ventilation hole extending into the interior of the damper plate is formed on its outer wall. An adjusting cylinder is fixedly connected to the inner wall of the damper plate. Fixed baffles are fixedly connected to both sides of the adjusting cylinder. A contraction groove is formed inside the fixed baffle. A telescopic baffle is slidably connected inside the contraction groove via an adjusting mechanism. Multiple sets of vertical grooves are formed at the bottom of the telescopic baffle. This allows the device to block the ventilation holes of the damper plate using a wind-blocking component. By controlling the area of ​​the blocked ventilation holes, the air volume of the secondary air duct can be adjusted, thus preventing incomplete combustion due to insufficient air volume or excessive heat loss due to excessive air volume, thereby greatly improving the practicality of the device.

The utility model discloses a kind of filter elements of self-suction filter type anti-particle respirator, belong to dust respirator technical field, including bottom shell, fixedly arranged in the three-dimensional filter assembly of the bottom shell inside and the upper cover buckled in the top of the bottom shell, the outside of the bottom shell is provided with filter material renewal assembly, electrostatic filter paper is provided between the three-dimensional filter assembly and the upper cover, the both ends of the electrostatic filter paper protrude the gap between the upper cover and the bottom shell and connect on the filter material renewal assembly.The utility model is through the surface filter paper and three-dimensional flow guide structure of renewability, synchronously conquers the double bottleneck of material waste and insufficient air permeability in prior art, while having use comfort along with guaranteeing protection performance.

The utility model discloses a kind of kiln exhaust device and system, it is related to ternary positive electrode material technical field.Kiln exhaust device includes smoke exhaust straight pipe;Smoke exhaust straight pipe includes first straight pipe and second straight pipe;Wherein, first straight pipe is located at the outside of kiln furnace body, second straight pipe is located at the inside of kiln furnace body or from the inside of kiln furnace body to first straight pipe extend;First straight pipe is detachably connected with second straight pipe.The setting of smoke exhaust straight pipe has reduced airflow resistance, improved exhaust efficiency, reduced the risk of air pipe blockage and corrosion, effectively improved the frequency of shutdown maintenance, which not only helps to improve the production quality and production efficiency of ternary positive electrode material, but also can reduce production cost and maintenance cost, enhance the market competitiveness of enterprise.The successful development of new type kiln exhaust device will also provide new ideas and methods for the technological progress of ternary positive electrode material industry, and is expected to promote the entire industry to more efficient, environmentally friendly, sustainable direction.

The utility model discloses a ventilating and energy-saving device for a green building, which relates to the technical field of ventilating and energy saving, aims to solve the technical problems of higher energy consumption and higher equipment maintenance cost in the prior art, and comprises a frame, a support rod, a rotating component and a replacement component. According to the utility model, the frame and the ventilation opening are adaptively installed, and the support rod fixes the motor, so that the overall stability is guaranteed, the motor is convenient to maintain, and the cost is reduced; the motor drives the rotating column to rotate to be matched with the air inlet hole and the air outlet hole to introduce and discharge natural air. Through a flowing block structure, natural wind forms laminar flow, loss is reduced, and efficiency is improved; the replacement disc and the replacement groove cooperate with the flow plate to construct efficient heat exchange, temperature is adjusted, and energy consumption is reduced; and the flowing plate can filter and intercept impurities in natural wind, so that the indoor air quality is improved. The device integrates the functions of stability, efficient ventilation, energy conservation, consumption reduction and air purification, and provides reliable guarantee for building a healthy, comfortable, low-carbon and environment-friendly indoor environment for green buildings.

The invention discloses a breathable flyknit vamp and a production method, and belongs to the technical field of flat knitting fabrics, the breathable flyknit vamp comprises a breathable surface, support strips and air guide vanes, a plurality of breathable holes distributed in an array are formed in the breathable surface, the plurality of support strips are distributed around the breathable holes, two ends of each support strip respectively point to two adjacent breathable holes, and the air guide vanes are arranged on the breathable surface. The supporting strips are of a structure sunken in the surface of the ventilation face, the multiple air guide pieces are distributed around the multiple ventilation holes, the middle sections of the air guide pieces protrude in the direction away from the ventilation face, the air guide pieces and the ventilation face surround to form an air inlet and an air outlet which are communicated, and air outlet is closer to the ventilation holes than the air inlet. The sectional area of the channel is unidirectionally reduced. According to the breathable flyknit vamp and the production method, the air guide pieces with the Venturi tube structures are formed through multi-needle bed integrated weaving and are communicated with the air holes in a directional mode, active ventilation is achieved through the foot arch in the walking process, and the breathable efficiency of the flyknit vamp is effectively improved.

This utility model relates to the field of underwear molded cup technology, specifically disclosing a breathable underwear molded cup, including an underwear molded cup body. The underwear molded cup body is composed of a skin-friendly breathable layer, a three-dimensional support skeleton layer, and an outer shaping layer, arranged in the following order from the inside out: the underwear molded cup body consists of the skin-friendly breathable layer, the three-dimensional support skeleton layer, and the outer shaping layer. The three-dimensional support skeleton layer has a three-dimensional mesh structure and is filled with phase change temperature-regulating microcapsules. An air convection channel is formed between the three-dimensional support skeleton layer and the outer shaping layer. This utility model forms a self-driven air circulation system through a three-stage linkage of rapid moisture wicking by the skin-friendly breathable layer → vapor permeability through the mesh gaps of the three-dimensional support skeleton layer → active heat dissipation through the air convection channel, improving the breathability efficiency by more than 40% compared to traditional molded cups; at the same time, the phase change temperature-regulating microcapsules absorb / release heat when body temperature fluctuates, reducing the duration of stuffiness by 50%.

The box body comprises a base, an incubator is fixedly arranged at the upper end of the base, the front end of the upper portion of the incubator is of an opening structure, four sliding rails are fixedly arranged on the two sides of the upper portion in the incubator, the sliding rails are distributed at equal intervals, and the front ends of the sliding rails are of an opening structure. A mounting strip is arranged in the sliding rail, the mounting strip slides in the sliding rail, one side of the mounting strip extends to the outside of the sliding rail, through holes are formed in the front end of the interior of the sliding rail and the front end of the interior of the mounting strip, the through holes are of a penetrating type structure, the through holes in the sliding rail correspond to the through holes in the mounting strip in position, and inserting rods are arranged in the through holes. By means of the structure, the problems that the using effect of the box body is not good enough, and the ventilation effect in the box body is not good enough are solved.

The utility model relates to the technical field of low-pressure carburization, and discloses a low-pressure carburization vacuum furnace heating chamber capable of quickly exchanging air, which comprises a vacuum furnace provided with a heating module, a furnace cover hinged to the top and a bracket I arranged at the bottom, an air inlet pressure regulating chamber is arranged below the vacuum furnace, the air inlet pressure regulating chamber is connected with the vacuum furnace through a uniform air distribution module, a plurality of air delivery pipes are arranged at the top of the air inlet pressure regulating chamber, the air inlet pressure regulating chamber is connected with a nitrogen source, a carbon source and an air purification module through the air delivery pipes, and a preheating module is arranged in the air inlet pressure regulating chamber; an exhaust pressure regulating chamber is arranged on one side of the vacuum furnace, a vacuum pump is arranged on the vacuum furnace, an exhaust port of the vacuum pump is connected with the exhaust pressure regulating chamber, and an exhaust pump is arranged on the exhaust pressure regulating chamber. Compared with the prior art, the device has the advantages that the pressure difference of the two sides of the vacuum pump can be regulated and controlled, gas in the vacuum furnace can be conveniently and rapidly exhausted, the gas exchange speed in the vacuum furnace is higher, and the gas exchange efficiency is higher.

The ventilation device comprises an outer shell and a rotating part, a supporting frame is fixedly installed in the outer shell, the outer shell is further provided with connecting frames arranged at the two ends of the outer shell, a filter screen is vertically arranged in the connecting frames in a sliding mode, a handle is arranged at the top of the filter screen, the rotating part is arranged in the outer shell, and the rotating part is arranged in the outer shell. The rotating part is provided with a rotating shaft rotationally arranged in the supporting frame, one end of the rotating shaft is connected with a driving unit in the shell, the other end of the rotating shaft is detachably connected with the fan blades, a sliding block is transversely arranged in the rotating shaft in a sliding mode, and the sliding block slides to abut against the fan blades so as to fix the positions of the fan blades. Through the arrangement of the rotating part, the fan blades can be quickly disassembled and assembled through transverse sliding of the sliding block, meanwhile, stable connection of the fan blades and the rotating shaft is guaranteed, and the ventilation efficiency is improved.

The utility model discloses a sound insulation and noise reduction air duct which comprises an air guide pipe, an air inlet fan for introducing external air is installed on the air guide pipe, a composite noise reduction plate is installed in the air guide pipe, and a liquid injection hole for dropwise adding scented water is formed in the position, over the composite noise reduction plate, of the upper face of the air guide pipe. And an air outlet for exhausting air into a room is formed below the air guide pipe. According to the sound insulation and noise reduction air channel, noise can be effectively reduced through staggered arrangement of the composite noise reduction plates, air can effectively penetrate through the sound insulation and noise reduction air channel while noise is reduced, the pressure of air circulation at the S-shaped channel is reduced, wind resistance is reduced, and the ventilation efficiency is improved. In addition, scented water is injected into the polyester fiber cotton through the liquid injection hole, air can be scented while ventilation is conducted, and better experience can be brought to indoor people.

The utility model relates to a plug-in frame guide rail and plug-in frame type communication equipment, the plug-in frame guide rail comprises a plug-in frame guide rail body, the plug-in frame guide rail body is provided with a plurality of air outlet through holes, the air outlet through holes penetrate through the front face and the back face of the plug-in frame guide rail body, and a guide rail groove is formed between every two adjacent air outlet through holes in the front face of the plug-in frame guide rail body; air deflectors are fixedly arranged at the positions, corresponding to the guide rail grooves, of the back face of the plug-in frame guide rail body, and each air deflector is located between every two adjacent air outlet through holes. The main function of the air guide plate is to guide cooling air and ensure that the cooling air can smoothly enter and pass through the two air outlet through holes, so that air cooling is effectively performed on the electric parts on the two sides of the communication equipment; by additionally arranging the air guide plate, the improved insertion frame guide rail can guide air flow more reasonably, the air resistance on the air duct channel is obviously reduced, and the obstruction of the air flow when the air flow passes is greatly reduced; due to parallel arrangement and position selection of the air deflectors, local turbulent flow is effectively reduced.

This utility model belongs to the field of pillow technology and discloses a sponge spring breathable pillow, including an upper layer of foam with through-holes; a middle breathable connecting column assembly, comprising multiple breathable connecting columns, one end of which is mounted on the upper layer of foam; a bottom support spring assembly, comprising multiple conical spiral springs, with the breathable connecting columns vertically penetrating the upper layer of foam and coaxially connected to the conical spiral springs; and a base plate, mounted below the bottom support spring assembly. The bottom of the upper layer of foam has positioning blind holes corresponding to the breathable connecting columns, with the depth of the blind holes being one-third to one-half the length of the breathable connecting columns. This utility model effectively solves the problem of stuffiness and improves breathability through a three-dimensional airflow path from the through-holes distributed in an array on the upper layer of foam to the hollow connecting columns arranged in a rectangular array and then to the conical spring channels.

This invention relates to the field of automotive ventilation frame technology and discloses a dustproof automotive ventilation frame structure. It includes a mounting frame base, the rear surface of which is fixedly connected to an inner rear door panel, and the front surface of which is fitted with an outer rear door panel. A first ventilation frame blade is fixedly fitted inside the outer rear door panel, and a first fixing rod is fixedly connected to the front surface of the first ventilation frame blade. When air enters the interior of the outer rear door panel, a first spring, affected by the airflow, can oscillate on the surface of the ventilation and dustproof connecting filter plate. This causes a second spring to drive a plastic elastic soft plate and a dust cleaning brush to tap on the surface of the ventilation and dustproof connecting filter plate, thus cleaning the dust accumulated on its surface. Simultaneously, the double-layer ventilation frame blades and ventilation and dustproof connecting filter plate effectively block external dust, thereby improving the ventilation efficiency of the ventilation frame.

This utility model discloses a synchronous air intake and exhaust architecture and a fresh air device based on a single-pipe internal cavity, relating to the field of air purification equipment technology. It includes: an outer pipe body; an inner pipe body embedded inside the outer pipe body, with an independent exhaust cavity formed inside the inner pipe body, and an independent air intake cavity formed inside the outer pipe body corresponding to the outside of the inner pipe body, the exhaust cavity and the air intake cavity being arranged alternately inside the outer pipe body; and a wind-driven component with two wind output ends, the two wind output ends of the wind-driven component being arranged one-to-one with the output airflow direction in the exhaust cavity and the air intake cavity, respectively. This solves the technical problems of poor installation adaptability and low ventilation efficiency of existing fresh air units.

The utility model discloses extension type laboratory ventilation equipment, which relates to the technical field of laboratory equipment, and comprises a laboratory ventilation cabinet, an exhaust pipe and a fan, the top of the laboratory ventilation cabinet is provided with an exhaust outlet, one end of the exhaust pipe is communicated with the exhaust outlet, and the other end of the exhaust pipe is communicated with the fan. An exhaust hood and an adjusting assembly are arranged in the laboratory ventilation cabinet, the exhaust hood is communicated with the exhaust outlet, the adjusting assembly comprises a vertical sliding rail, a horizontal sliding rail and a movable sliding seat, the vertical sliding rail is fixedly connected with the laboratory ventilation cabinet, the horizontal sliding rail is connected with the vertical sliding rail in a sliding fit mode, and the movable sliding seat is connected with the horizontal sliding rail in a sliding fit mode. And the exhaust hood is fixedly connected with the movable sliding seat. By sliding the horizontal sliding rail and the movable sliding seat, the exhaust hood can be rapidly moved to a pollutant generation position according to actual experimental requirements, targeted ventilation of different experimental positions is achieved, harmful gas is effectively prevented from being diffused and accumulated in the ventilation cabinet, and the ventilation efficiency and the pollutant capturing effect are improved.

The present application relates to the technical field of tobacco recycling, and discloses a steam heat exchanger for tobacco extraction, which comprises an inlet and outlet cavity, a heating cavity and a transfer cavity. The inlet and outlet cavity and the transfer cavity are communicated through heat exchange pipes, the inlet and outlet cavity is divided into upper and lower cavities by a layered plate, and the heat exchange pipes pass through the heating cavity. The heating cavity is provided with odd number of at least three drainage plates staggered in upper and lower positions; the drainage plate between the inlet and outlet cavity and the inlet end is close to the inlet and outlet cavity, the drainage plate between the outlet end and the transfer cavity is close to the transfer cavity, the drainage plate is provided with a heat exchange pipe mounting hole and a vent hole. The bottom of the heat exchange pipe below the heating cavity is provided with a gas guide plate, the gas guide plate is parallel to the heat exchange pipe and leaves a gap, and a drain hole is arranged between the two drainage plates at the tail portion. The energy-saving heat exchanger reduces the temperature difference of the heating cavity, removes condensate water, adapts to multiple steam working conditions, improves the energy-saving effect and adaptability of heat exchange, and solves the problems of large temperature difference of the heat exchanger, difficulty in removing condensate water and difficulty in adapting to multiple steam working conditions in the extraction of tobacco.

This application relates to the field of fan technology, disclosing a fan and a range hood. The fan includes: a volute casing, including annular walls; and an impeller located inside the volute casing. In the axial section of the fan, the annular walls bulge towards the side away from the axis, and the outer annular wall surface of the impeller also bulges towards the side away from the axis. This improves the fan's airflow and air pressure output capacity, increases energy efficiency and air volume, and reduces noise.

This utility model provides a corrosion-resistant axial flow fan, belonging to the field of fan technology. It solves the technical problems of existing fans being prone to corrosion. This corrosion-resistant axial flow fan includes a fan casing, a motor, fan blades, and a support frame. A fixed shaft is fixedly connected to the support frame. The motor includes a stator assembly and a rotor assembly, which are integrally formed with the fixed shaft. The fixed shaft has an upper cover and a lower cover, forming a receiving cavity between them. The rotor assembly and stator assembly are located within the receiving cavity, and the rotor assembly is fixedly mounted by the upper and lower covers. The fixed shaft includes a first fixing part and a second fixing part, with the stator assembly located between the first and second fixing parts. A first bearing is installed between the first fixing part and the upper cover, and a second bearing is installed between the second fixing part and the lower cover. The fan blades and the lower cover are integrally formed. This utility model solves the problem of motors being easily corroded when exposed to airflow in the duct, extending the service life of the motor and the entire machine, and significantly reducing maintenance costs and the risk of downtime due to corrosion.

This utility model relates to the field of greenhouse technology, specifically disclosing an automatic ventilation and temperature control device for greenhouses. It includes a ventilation duct, a temperature sensor located at the top right side of the duct, a sealing assembly within the duct's inner cavity, and ventilation assemblies at both the top and bottom of the duct's inner cavity. Each ventilation assembly includes a ventilation box, the outer side of which is fixedly connected to the duct. This utility model uses the temperature sensor to detect the temperature inside the greenhouse. When the temperature sensor detects that the temperature is too high, an external controller activates the sealing assembly, opening the ventilation channel within the duct. Natural air then ventilates the greenhouse through the duct. If increased ventilation efficiency is required, a cooling plate activates, drawing air into the ventilation box through an intake vent, where the cooling plate cools the air.

The utility model relates to ventilation device technical field, concretely is a greenhouse ventilation device for vegetable planting, its solution traditional ventilation device single ventilation position leads to the problem that the air in the shed flows, including wall body, be provided with the air hole on the wall body, install the ventilation fan in the air hole, the inboard of wall body is installed for the cover body for surrounding ventilation fan one side, the cover body is rotatably installed with the flow guide pipe, the flow guide pipe is bent and sets up, one end of flow guide pipe is rotatably connected with the cover body, the other end of flow guide pipe is the free end, the height of rotatable flow guide pipe its free end will change, be provided with the air inlet on the free end of flow guide pipe, the air inlet is flared and sets up, be provided with the sleeve on the cover body, the top silk is connected on the sleeve through screw thread, the screwing end of top silk can be with the outer wall of flow guide pipe abuts, be provided with a plurality of top silk can insert the positioning hole on the outer wall of flow guide pipe, the outer wall of flow guide pipe is fixedly provided with the handle.

The utility model relates to the field of residence ventilation, and discloses a high-rise residence energy-saving ventilation structure which comprises an air inlet pipeline and an air outlet pipeline. One end of the air inlet pipeline and one end of the air outlet pipeline communicate with the outside, the other end of the air inlet pipeline communicates with the upper portion of the first air circulation mechanism, the other end of the air outlet pipeline communicates with the upper portion of the second air circulation mechanism, one end of the first ventilation pipe communicates with the right side of the first air circulation mechanism, and the outer wall of the first ventilation pipe fixedly communicates with one ends of the multiple air outlet pipes. Through the arrangement of the air inlet pipeline, the air outlet pipeline, the first air circulation mechanism and the second air circulation mechanism, rapid circulation and air exchange of indoor air are achieved, and the ventilation efficiency is improved.

The application relates to the field of grain storage, in particular to a low-energy-consumption circulating ventilation system which comprises an air extraction pump connected to a granary, a sealing device, multiple air inlet pipes and multiple air outlet pipes, the air extraction end of the air extraction pump is communicated with the inner cavities of the multiple air outlet pipes, the sealing device comprises a sealing film, a sealing plate and a sealing pipe, the sealing plate is connected to the circumferential inner wall of the granary, a sealing cavity for embedding the sealing pipe is formed in the plate surface of the sealing plate, and when the circumferential edge of the sealing film is embedded in the sealing cavity, the inner wall of the sealing cavity and the outer wall of the sealing pipe clamp the sealing film on both sides to form limiting. In the application, the sealing film, the sealing plate and the sealing pipe are arranged, the sealing film limits the air flow towards the roof of the granary, and the air is forced to fully contact the grain under the sealing film, so that the ventilation efficiency in the granary is improved, the grain at the bottom of the granary is not prone to moisture and mildew, the user does not need to increase the air extraction power of the air extraction pump to improve the ventilation efficiency in the granary, and the energy loss is reduced, thereby embodying the concept of energy saving.