153results about How to "Improve ventilation efficiency" patented technology

The invention discloses a tunnel segmented exhaust method and system based on train working conditions, a medium and a product, and relates to the technical field of ventilation. The method comprises the steps that a target tunnel is divided into a plurality of control sections according to fan installation configuration of the target tunnel; acquiring train passing data and train configuration information of the control section, and calculating a flue gas growth value of the control section in a preset time period; collecting flue gas concentration data of the control section, and calculating a ventilation demand index of the control section in combination with the flue gas growth value; collecting wind direction parameters of the control sections, determining a ventilation control relationship between the adjacent control sections based on the ventilation demand indexes and the wind direction parameters, and generating a ventilation cooperation scheme; according to the ventilation cooperation scheme, operation parameters of the tunnel fans in all the control sections are calculated, and control instructions corresponding to the operation parameters are sent to the tunnel fans. By implementing the application, the fan operation can be adjusted according to the actual train operation condition, and the ventilation effect is optimized.

The invention discloses a ventilation and air exchange device for a green building. The ventilation and air exchange device comprises a ventilation and air exchange box, a mounting plate, a ventilation and air exchange opening, a rotary air disc and fan blades. Mounting plates are fixed to the two ends of the two sides of the ventilation box, fixing pins penetrate through the interiors of the mounting plates, one ends of the fixing pins extend into the green building wall, and ventilation ports are formed in the two ends of the outer side of the ventilation box. According to the ventilation device for the green building, a fan motor is used for driving a linkage shaft to rotate, and a transmission assembly is matched to enable a fan shaft to rotate synchronously, so that two rotating wind discs and a plurality of fan blades are driven to rotate, outdoor fresh air is extracted and fed into the green building, and the ventilation effect is improved. According to the indoor air purification device, vitiated air, harmful gas and microorganisms in a building can be effectively diluted and discharged, so that the indoor air quality is improved, a healthier and more comfortable living environment is provided for people, indoor oxygen can be effectively supplemented, and the freshness and vitality of indoor air are kept.

The invention discloses a ventilation-sound insulation integrated ultrathin metasurface grating and a using method thereof. The grating is composed of a perforated cover plate, a bottom plate, a plurality of slender cavities with different lengths formed by separating the perforated cover plate and the bottom plate through wall plates, and a peripheral grid-shaped ventilation area. According to the grille, the excellent broadband sound insulation performance can be achieved on the premise that the high ventilation quantity is guaranteed through a thin layer structure with the thickness as low as about 20 mm. The folded labyrinth resonance sound absorption units with gradient lengths are arranged in the non-ventilation area, broadband continuous sound absorption peaks can be generated, and sound absorption replaces sound insulation, so that broadband sound attenuation performance is obtained. Compared with an existing ventilation and sound insulation grille, the grille structure is thinner, larger in ventilation area and wider in working frequency band, the wide engineering application value of the grille structure is shown, a light-weight and low-frequency broadband noise reduction solution is provided for mechanical equipment such as airplanes, warships, high-speed rails and automobiles, and the mechanical equipment can be widely applied to mechanical equipment such as the airplanes, the warships, the high-speed rails and the automobiles. And the method also has wide application prospects in ventilation and sound insulation systems in green buildings.

The invention discloses a ventilation type anti-radiation device, and relates to the technical field of anti-radiation covers, the ventilation type anti-radiation device comprises an upper cover body and a lower cover body, the upper cover body and the lower cover body are detachably connected, the upper cover body and / or the lower cover body are / is provided with flow guide grids for airflow circulation and spiral rising, no gap exists in the overlook direction of the flow guide grids, and gaps exist in the side view direction of the flow guide grids. A meteorological sensor is installed in the upper cover body. The ventilation grid has the capabilities of guiding flow and enhancing airflow circulation, accelerates air circulation, further effectively reduces the temperature in the cover body, is simple in structure, low in cost and convenient to produce and maintain, fully considers radiation and rain and snow protection, and is superior to an existing protective cover framework in ventilation efficiency.

The invention belongs to the technical field of tunnel ventilation regulation and control, and particularly relates to a control method of a highway tunnel ventilation system based on wind speed. According to the invention, sensors are arranged at key positions of a tunnel, wind speed and environmental parameters are collected, and traffic flow detection is carried out by using video equipment and an SVM model. Then, a comprehensive evaluation function is defined according to the collected data to calculate ventilation requirements, and a ventilation mode is selected based on the ventilation requirements; thirdly, the opening degree of a ventilation opening and the speed of a draught fan are adjusted through a PID controller, so that the ventilation requirement is met. Finally, CFD software is used for simulating air flow, the ventilation opening layout and opening and closing time are optimized through a simulated annealing algorithm, and therefore ventilation efficiency optimization is achieved. In the whole process, accurate control and intelligent optimization of the tunnel ventilation system are achieved, the ventilation efficiency is improved, and the energy consumption is reduced.

The utility model discloses a dust collection device and a steel rail grinding wagon. The dust collection device comprises a dust removal box, a fan, a spark catcher, an air duct below the wagon, a dust hood and a dust storage hopper. The dust removal box is arranged on a vehicle body of the grinding vehicle, and a filter drum is arranged in the dust removal box. The dust hood is connected between the under-vehicle air duct and the polishing device, the spark catcher is communicated with the dust removal box, and the under-vehicle air duct is communicated to the spark catcher. The dust storage hopper is arranged at the bottom of the dust removal box, the fan is communicated with the dust removal box, and an air outlet of the fan is formed in the top of the vehicle body. The technical problems that an existing dust collecting device is high in labor cost, large in occupied space and high in internal temperature and failure rate can be solved.

The invention relates to the technical field of gas dust comprehensive prevention and control, in particular to a coal mine underground gas dust comprehensive prevention and control device. The air supply sleeve is arranged in the working roadway and communicated with the tail end of the air inducing pipe, and a plurality of air supply outlets are formed in the wall of the air supply sleeve; the water spraying sleeve is arranged in the working roadway and communicates with the air supply sleeve, and a plurality of water spraying channels are formed in the wall of the water spraying sleeve so as to spray water mist to the working roadway; the water conveying pipe is connected with the water spraying sleeve and used for supplying water to the water spraying sleeve. The rotating shaft is arranged in the air supply sleeve, the water spray sleeve and the water conveying pipe, and is provided with a plurality of power blades and spiral water supply blades; fresh air impacts the power blades so as to drive the rotating shaft and the spiral water conveying blades on the rotating shaft to rotate, and therefore water flow in the water conveying pipe is guided into the water spraying sleeve. The device is matched with an existing negative pressure ventilation system, ventilation and dust falling are conducted at the same time, and the accumulation risk of harmful gas and dust is reduced.

The utility model discloses an outdoor electrical cabinet with a diversion function, which comprises a cabinet body, a plurality of air suction holes uniformly arranged on the periphery of the lower end of the cabinet body, an air ball assembled in the middle of the upper surface of the cabinet body, a cabinet door hinged on the front surface of the cabinet body, and a circle of hole protection bridge connected inside the lower end of the cabinet body. The hole protection bridge is of a hollow structure and covers the air suction holes, and a plurality of air holes are formed in the upper surface of the hole protection bridge at equal intervals. The wind ball is mounted at the top of the cabinet body, and any parallel air flow is accelerated and converted into vertical air flow from bottom to top according to the principle that the natural wind speed of the nature pushes the turbine of the wind ball to rotate and air convection inside and outside the cabinet body, so that the ventilation effect in the cabinet body is improved; when the air ball rotates, a certain amount of spiral suction force is formed, meanwhile, the air inlet is formed in the bottom of the cabinet body and used for sucking in external fresh air, vitiated air is discharged from the holes formed in the air ball, air flowing is facilitated, and therefore the ventilation efficiency is improved.

The invention relates to the technical field of information safety cabinets, and discloses a flow guide type air cooling system and an information safety cabinet, an air return fan assembly comprises a fan cover, a fan cover and a cover cap, the fan cover comprises a lower half body penetrating through the fan cover and an upper half body limited in the fan cover, and the cover cap and the fan cover are matched, sealed and connected in a covering mode to form an air cavity; detachable filter screen baffles are inserted into the inner sides of the four faces of the upper half body in a sliding mode, filter screens are installed in the filter screen baffles, locking blocks for locking and positioning the fan cover are arranged at the four corners of the bottom of the lower half body, and four mounting columns with holes for supporting the centrifugal fan are annularly arranged on the inner bottom wall of the lower half body at equal intervals; and the cover cap is also fixed on the upper half body of the fan cover through a locking knob. According to the invention, rapid installation and maintenance of the fan are realized, and the stability and ventilation efficiency of the system are improved. And the detachable filter screen baffle, the locking knob, the elastic clamping strip and other structures are adopted, so that the installation, replacement and maintenance processes are simpler and more convenient.

The invention discloses new energy automobile battery tray machining equipment and a machining method, and relates to the technical field of boring, the new energy automobile battery tray machining equipment comprises a bottom plate, a battery tray is arranged at the top of the bottom plate, a boring machine is fixedly connected to the top of the bottom plate, an electric lifter is fixedly connected to the outer wall of the boring machine, and a machining head is fixedly connected to the bottom of the electric lifter; a boring cutter is fixedly connected to the bottom of the machining head, a spraying mechanism is arranged on the outer wall of the machining head, by arranging a water mist flow guiding mechanism, water mist with large diffusivity can be guided out upwards in a large area through diffusion type flow guiding of a plurality of blades, the strength is moderate, the water mist sprayed out through a spraying head can enter a boring hole firstly, and then the water mist is sprayed out through the spraying mechanism. And then water mist wrapping residues in the boring hole and other pervasive water mist can be guided and discharged upwards in a targeted mode through rotation of the blades together, and targeted measures are taken when the battery tray is bored.

The utility model discloses an electric window opening mechanism which comprises an electric push rod 1, wherein the push end of the electric push rod 1 is connected with a window sash 4; a barrel of the electric push rod 1 is fixed to a support 3 serving as a supporting arm, and the support 3 is rotationally fixed to a window frame through a hinge shaft 2. By means of the centrifugal arm principle, the window sash can be opened by 0-180 degrees, the structure is convenient to manufacture and easy to achieve, and the ventilation efficiency of a window body can be greatly improved.

The invention provides a prefabricated concrete radiation cooling ventilation external wall panel. The prefabricated concrete radiation cooling ventilation external wall panel comprises a prefabricated concrete radiation cooling ventilation external wall panel outer acanthus, a prefabricated concrete radiation cooling ventilation external wall panel inner acanthus, a grating, outer acanthus stiffening ribs and a cover plate, the prefabricated concrete radiation cooling ventilation external wall panel outer acanthus and the prefabricated concrete radiation cooling ventilation external wall panel inner acanthus are connected through a plurality of outer acanthus stiffening ribs to form a ventilation air duct; a cover plate is arranged at the upper end of the ventilation air duct; a grating is embedded in the upper part of an outer acanthus of the prefabricated concrete radiation cooling ventilation externally-hung wallboard; the sleeve connecting piece is pre-buried in an inner leaf plate of the prefabricated concrete radiation cooling ventilation external wall plate, and the prefabricated concrete radiation cooling ventilation external wall plate is installed on a main body structure and spliced to a parapet wall from the bottom layer of the main body structure. The invention relates to the technical field of fabricated buildings, and can solve the problems that in the prior art, an external wall additional heat preservation layer is prone to cracking, falling off and water seepage, and a double-layer ventilation curtain wall is high in cost and limited in use.

The present invention discloses an energy-saving and environmentally friendly telescopic air outlet, and relates to the technical field of ventilation equipment. The present invention comprises a ventilation pipe main body, a connecting ring is fixedly connected to the circumferential surface of the ventilation pipe main body, a telescopic pipe is fixedly connected inside the connecting ring, a mounting plate is fixedly connected to one end of the ventilation pipe main body, and a fixing bolt is threadedly connected to the top of the mounting plate. The present invention arranges components such as a driving motor, a small gear and a large gear inside the adjustment mechanism, so that the output shaft of the driving motor can rotate with the small gear during the rotation process, and then rotate with the large gear. When the large gear rotates, the connecting column 1 and the arc plate on its surface will rotate along with it, and the rotation of the arc plate will rotate the connecting block and the connecting column 2, so that the vent cover will be pulled, thereby achieving the effect of automatically closing and opening the vent. When it is necessary to heat or cool the indoor air, the amount of external air entering can be reduced, thereby reducing the use of energy.

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.

The utility model relates to noise isolation device technical field, concretely relates to noise isolation and noise reduction protection integrated device, including a plurality of mutual splicing's protective plate, and the protective plate is composed of the outer frame board of setting at the outside and the sound insulation layer of setting at the central position department of outer frame board, and the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the

The utility model provides a wind tower with a corrugated steel structure, which is arranged outside a shaft ring of a vertical shaft and comprises a wind tower main body and a wind tower cap arranged at the upper end of the wind tower main body, the wind tower body comprises a connecting foundation, a plurality of tower columns vertically arranged on the connecting foundation and a corrugated steel shell fixed to the tower columns. The wind tower cap is conical and is fixedly arranged at the top ends of the tower columns; the corrugated steel shell continuously extends to the upper middle portions of the tower columns along the lower ends of the tower columns, and an air opening is reserved between the wind tower cap and the upper edge of the corrugated steel shell. According to the corrugated steel wind tower, the occupied area of the wind tower can be reduced, the construction speed is increased, the influence of the wind tower on the surrounding environment in the construction and working process is reduced, the ventilation efficiency of the wind tower is improved, and energy consumption is reduced.

The invention relates to the technical field of tunnel ventilation systems, and provides a novel tunnel ventilation system and method based on a thrust fan, and the system comprises a thrust fan terminal, a working condition data monitoring terminal, a tunnel data monitoring terminal, an intelligent analysis terminal and a feedback control terminal; the thrust fan terminal is installed at the entrance and exit of the tunnel and used for ventilating the tunnel. The working condition data monitoring terminal is used for monitoring working condition data of the thrust fan terminal in real time; the tunnel data monitoring terminal is used for monitoring traffic flow, gas concentration and wind speed in the tunnel and weather data outside the tunnel in real time; the intelligent analysis terminal is used for performing intelligent analysis according to the working condition data of the thrust fan terminal, the traffic flow, the gas concentration and the wind speed in the tunnel and the weather data outside the tunnel to generate analysis result information; and the feedback control terminal is used for generating and executing a feedback control instruction according to the analysis result information. The tunnel ventilation system has the effects that the construction cost of the tunnel ventilation system is reduced, and the ventilation effect is improved.

The invention relates to the technical field of tunnel ventilation and discloses a tunnel exhaust system, a vertical shaft is arranged on the top wall of a tunnel in a penetrating mode, a smoke exhaust device comprises an exhaust fan, an air cap, an unpowered fan, a driving mechanism and a controller, the air cap is arranged at the upper end of the vertical shaft, an air inlet and an air outlet are formed in the side wall of the air cap, and an exhaust port is formed in the top of the air cap; the unpowered fan is arranged in an inner cavity of the hood, the inner cavity of the hood is communicated with an inner cavity of the vertical shaft, and the driving mechanism drives the hood to rotate to enable an air inlet of the hood to be opposite to the wind direction; the exhaust fan is arranged at the bottom of the vertical shaft; the fan driver drives fan blades to rotate; when the air speed detection sensor detects that the actual air speed is larger than the preset natural exhaust air speed, the exhaust fan stops pausing, and the air inlet of the hood is opposite to the air direction. The exhaust fan can be started and stopped according to the actual wind speed, wind energy is fully used as power to drive the unpowered fan, air circulation in the tunnel is guaranteed, electric energy consumption is reduced, and energy conservation and environmental protection are achieved.

The present invention relates to the technical field of fuel filters, and discloses a vent valve and a fuel filter. The vent valve includes a valve body and a valve core, the valve body is connected to the vent hole, an air inlet is provided at one end, an air outlet is provided at the other end, and a guide rib is provided on the inner wall of the valve body along the axial direction of the valve body; the valve core is placed in the valve body and slidably connected with the guide rib, the valve core is provided with an initial position and a working position, when the valve core is in the initial position, the air inlet is disconnected from the air outlet, when the valve core is in the working position, the air inlet is connected to the air outlet, and the valve core can be in the initial position and the working position in turn by pressing the valve core. The present invention changes the screw-type ventilation into a press-type ventilation, making the operation more convenient, labor-saving, and the ventilation efficiency higher; the valve core only has an initial position and a working position, which improves the poor sealing effect caused by improper operation and ensures the sealing effect of the vent valve; there is no need to disassemble the vent valve for ventilation, which reduces the risk of the vent valve breaking and increases the service life of the vent valve.

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 utility model belongs to the technical field of breathing machines, and particularly relates to a gas circuit and a breathing machine, which comprise a breathing valve, a first one-way valve, a control valve, a gas inlet pipeline and a gas outlet pipeline, the air inlet pipeline and the air outlet pipeline are mutually independent; the air inlet end of the air inlet pipeline is communicated with an air source, the air outlet end of the air outlet pipeline is communicated with the atmosphere, and the air outlet end of the air inlet pipeline and the air inlet end of the air outlet pipeline intersect at the patient end. The first one-way valve is arranged on the air inlet path and used for allowing air to enter the patient end in a one-way mode. The breather valve is arranged on the air outlet pipeline; the control valve is connected with the breather valve to control the breather valve to act; the control valve is an electric valve. According to the gas circuit and the breathing machine, the gas inlet gas circuit and the gas outlet gas circuit are mutually independent, the gas inlet gas circuit only supplies gas, the gas outlet gas circuit only discharges gas, inhaled gas and exhaled gas do not interfere with each other, and the ventilation effect is better; opening and closing of the breather valve are controlled by the control valve, the electric control valve has the effects of quicker action and flexible opening and closing compared with a pneumatic control valve, and the ventilation efficiency is higher.

The utility model discloses an efficient ventilating duct group, which comprises a fixing mechanism, a duct mechanism grouped through the fixing mechanism, and an adjusting mechanism arranged at one end of the duct mechanism, the duct mechanism comprises a duct main body, and the bottom of the duct main body is fixedly connected with an arc-shaped bent pipe; the bottom of each arc-shaped bent pipe is fixedly connected with a flow dividing pipe, and the adjusting mechanism comprises an adjusting pipe. According to the efficient ventilation pipeline set, a traditional turning connection mode is improved, the arc-shaped bent pipes are used for replacing and reducing air flowing resistance, airflow can be more smoothly transited, energy loss is reduced, and therefore the ventilation efficiency is improved; by means of the sound insulation cavity and the sound insulation cotton, sound insulation and noise reduction treatment can be carried out on noise generated when airflow in the air duct is adjusted, negative effects on health and working efficiency of people caused by the noise generated when the airflow in the pipeline is reduced and compressed are reduced, and a quieter using environment is provided.

The utility model discloses a local ventilation device for a coal mine, and relates to the technical field of coal mining. The device comprises a bearing plate which is arranged at an inlet or a ventilation wellhead of a mine, a placing groove is fixedly formed in one side of the bearing plate, a supporting plate is fixedly arranged on one side of the placing groove, a control panel is installed on the top of the supporting plate, and a power regulator is arranged on the upper side of the front face of the supporting plate; and the ventilation mechanism is used for extracting air from the mine and conveying external air into the mine, and the ventilation mechanism comprises an air blower installed on the other side of the top of the bearing plate. The gas concentration sensor can monitor the gas concentration in a mine in real time, and when the gas concentration exceeds a set threshold value, the control panel can automatically adjust the power of the air blower through the power regulator, so that the operation power of the ventilation mechanism is changed, the air volume is rapidly increased, the ventilation efficiency is improved, and the safety of miners is guaranteed.

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 discloses a greenhouse with a double-film double-arch structure, and relates to the technical field of greenhouses. The sunshade device comprises stand columns, an inner-layer framework, an outer-layer framework, a sunshade assembly and a ventilation assembly. Vertical column connecting pieces are fixed to the tops of the vertical columns, and outer sunshade vertical columns are fixed to the tops of the vertical column connecting pieces; an inner-layer framework and an outer-layer framework are fixedly installed between the bottom and the top of the stand column connecting piece respectively. A cross beam is fixed between the tops of the outer sunshade stand columns. A sunshade assembly is assembled on the cross beam; the ventilation assembly is fixedly mounted between the inner-layer framework and the outer-layer framework; the sunshade assembly comprises a sunshade curtain and a curtain drawing motor; the ventilation assembly comprises an air blower and a ventilation air duct. And the air blower is fixedly communicated with the ventilation air duct. Under the action of the sunshade assembly and the ventilation assembly, the greenhouse has the advantages that exposure to the sun is avoided, the high temperature degree in summer is reduced to a great extent, and the internal high temperature caused by the fact that external heat at the top of the greenhouse is transferred to the interior is 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.

The utility model discloses a water inflow prevention device of a negative pressure fan. The water inflow prevention device of the negative pressure fan comprises a negative pressure fan body and a protection assembly, the negative pressure fan body comprises a negative pressure box, the negative pressure box is designed to be of a through cavity structure, a baffle is fixedly arranged on the end side of an inner cavity of the negative pressure box, a limiting frame is fixedly arranged at one end of the baffle in parallel, and a carrying frame is arranged at the center end of the limiting frame; a driving motor is fixedly assembled in the carrying frame, rotating blades are arranged at the output end of the driving motor, connecting pieces are further symmetrically arranged on the outer end side of the negative pressure box, the connecting base is installed on the negative pressure box, a notch is formed in one end of the connecting base, the protection assembly comprises a protection frame, and inserting columns are symmetrically arranged at one end of the protection frame. According to the negative pressure fan, rainwater can be prevented from being splashed into the negative pressure fan through the arranged protection assembly, the rainwater is effectively prevented from entering the fan through the protection assembly, water is prevented from corroding a motor and key parts of blades, and normal operation of the fan is guaranteed.

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 composite building wall structure for a fabricated agricultural greenhouse, which comprises a greenhouse wall body and a ventilation mechanism, the ventilation mechanism is arranged on the inner side surface of the greenhouse wall body, and the illumination mechanism is arranged on the outer side surface of the greenhouse wall body. Through the arrangement of the rotating wall plates and the ventilation pipeline, flexible ventilation control is achieved, the orientation of the ventilation pipeline is adjusted according to needs, the ventilation quantity and the wind direction in the greenhouse are effectively adjusted, and healthy growth of crops is guaranteed. And secondly, the ventilation pipeline adopts a cone design, so that natural wind can be more effectively captured, and the ventilation effect and the ventilation efficiency are improved.