34results about How to "Small circulation resistance" patented technology

The embodiment of the invention provides a naphtha raw material filter, and relates to the technical field of petroleum refining. The naphtha raw material filter comprises a supporting frame, the top of the supporting frame is fixedly connected with two bottom covers, the tops of the bottom covers are fixedly connected with a primary filtering tank body, and the outer wall of the primary filtering tank body is fixedly connected with a pressure gauge. A rotating rod drives a belt to move through a belt pulley I, the belt drives a rotating shaft and a driving clamping gear to rotate, and the driving clamping gear drives a driven clamping gear and a primary filter screen to rotate, so that naphtha is in more uniform contact with the primary filter screen; and the L-shaped lifting rod ascends and descends in a reciprocating mode, the L-shaped lifting rod drives the collision ball to collide with the primary filter screen, and vibration generated by the primary filter screen facilitates falling of impurities blocked on filter holes of the primary filter screen.

A radiator capable of rapidly dissipating heat, a shell unit with the radiator, and a casting mold for manufacturing the radiator. The radiator comprises a radiator plate body, a partition plate protruding upward is arranged on the radiator plate body, the partition plate can divide the space above the radiator plate body into a zigzag refrigerant flow channel, a plurality of heat dissipation columns arranged at intervals are arranged on the wall area of ​​the radiator plate body corresponding to the refrigerant flow channel, and the heat dissipation columns are protruding upward; a heat dissipation fin protruding upward is also arranged on the wall area of ​​the radiator plate body corresponding to the refrigerant flow channel, the heat dissipation fin is arranged along the extension direction of the flow channel section of the refrigerant flow channel where the heat dissipation fin is located, the heat dissipation fin at least connects the roots of some adjacently arranged heat dissipation columns in front and behind, the height of the heat dissipation fin is less than the height of the heat dissipation column connected thereto, and the heat dissipation fin, the heat dissipation column and the radiator plate body are an integrated structure.

The utility model discloses a high-temperature binary molten salt furnace burning blast furnace gas. The high-temperature binary molten salt furnace comprises a furnace body, an inner ring coil pipe, an outer ring coil pipe and a burner, wherein the lower end part of the furnace body is provided with a smoke outlet, the inner coil pipe and the outer coil pipe are both mounted in the furnace body, the inner coil pipe is positioned on the inner side of the outer coil pipe, the inner side of the inner coil pipe is provided with a radiation heat exchange chamber, a convection heat exchange channel is arranged between the inner coil pipe and the outer coil pipe, and the inner coil pipe and the outer coil pipe are arranged in the radiation heat exchange chamber. The upper end of the radiation heat exchange chamber is communicated with the upper end of the convection heat exchange channel, the lower end of the convection heat exchange channel is communicated with the smoke outlet, and the width B of the convection heat exchange channel is larger than or equal to 0.5 m. An installation opening communicated with the radiation heat exchange chamber is formed in the bottom of the furnace body. And the combustor is connected to the mounting opening and is used for combusting in the radiation heat exchange chamber to generate flue gas. The smoke exhaust speed can be increased, smoke can be exhausted smoothly, and the smoke is prevented from being accumulated in the furnace body.

This utility model discloses a multi-way valve, a thermal management system, and a vehicle. The multi-way valve includes a housing and a valve core. The multi-way valve has a first state in which the first flow port of the second flow channel is fully connected to the switching flow channel, and the first flow ports of both first flow channels are partially connected to the switching flow channel. Each first flow channel includes a first flow section and a second flow section that are bent and connected. The end of the first flow section away from the second flow section forms the first flow port, and the end of the second flow section away from the first flow section forms the second flow port. The angle between the central axis of the first flow section and the central axis of the second flow section of at least one first flow channel is α, where 120°≤α≤130°. The angle between the two sidewalls of the switching flow channel on the cross-section of the valve core is β, where 115°≤β≤135°. According to the embodiments of this utility model, by designing the values ​​of α and β to be within a suitable range, the flow resistance of the fluid within the multi-way valve can be effectively reduced.

The application discloses a dry-type transformer production equipment and belongs to the field of transformer production. The device comprises a rack, a negative pressure dust collection workbench arranged at the middle part of the rack, a support arranged above the negative pressure dust collection workbench, two groups of support plates arranged at the top of the rack, a driving shaft one rotatably arranged in one group of the support plates, a driving shaft two rotatably arranged in the other group of the support plates, and clamping pieces arranged at the output ends of the driving shaft one and the driving shaft two and used for clamping an insulating cylinder. The negative pressure dust collection workbench is arranged at the middle part of the rack to adsorb and blow away the copper scraps and insulating dust. A hierarchical pressure relief gas path composed of a buffer pipe, a gradually expanding inverted conical middle nozzle and a circular corner exhaust hole pressure reduction circular plate is arranged to weaken the high pressure of the air compressor starting and stopping transient peak value, and the hierarchical pressure relief gas path is cooperated with the air compressor to improve the yield of the dry-type transformer winding.

The utility model provides a kind of roasting furnace energy-saving smoke exhaust device, it is related to roasting furnace technical field, including flue gas pipeline main body, flue gas pipeline split body and support structure, the flue gas pipeline main body left and right sides are equipped with support structure, the flue gas pipeline split body is equipped in flue gas pipeline main body below, the flue gas pipeline main body is fixedly connected with flue gas pipeline split body and inside intercommunication, the utility model replaces traditional slope flue structure using direct connection type metal smoke exhaust device, constructs the efficient path of roasting furnace fire well mouth direct annular total flue. Especially designed reducing pipe perfect cover furnace mouth, effectively eliminates the local resistance at interface, cancels the slope flue and intercommunication cover, reduces flue gas flow resistance, the utility model is installed using hoisting mode, and recycling is carried out around the use of roasting furnace, by improving the pass rate of flue gas, effectively utilize flue gas waste heat to preheat graphite, save energy, achieve energy-saving production.

The present invention relates to the technical field of solar thermal utilization, and provides an integrated double-channel solar water guide tube, comprising a tube body, a heat-conducting tube extending along the length direction of the tube body is arranged inside the tube body, and the tube walls on the upper and lower sides of the heat-conducting tube are an integrated molding structure with the tube body; the heat-conducting tube divides the inner cavity of the tube body into an upper flow channel and a lower flow channel, and the internal cavity of the heat-conducting tube is a heat-conducting chamber, and the heat-conducting chamber is completely isolated from the upper flow channel and the lower flow channel; at least one of the left and right side walls of the heat-conducting tube is an outer wall directly connected to the tube body, and a plurality of superheat-conducting tube jacks arranged along the length direction of the tube are provided on the outer wall. The integrated double-channel solar water guide tube provided by the present invention, because it adopts an integrated molding structure, eliminates the welding process, reduces the manufacturing and maintenance costs, and adopts a straight-through heat-conducting chamber, increases the heat-conducting area, reduces the circulation resistance of the heat-conducting medium, and improves the efficiency of heat transfer.

This invention discloses a dispensing needle and its preparation method, belonging to the field of precision dispensing technology for consumer electronics. The dispensing needle includes a needle tube and a needle base, with the needle tube made of nickel-titanium alloy. The needle tube includes an adhesive dispensing section, a middle section, a tail section, and a mounting section along its axial direction. The adhesive dispensing section, tail section, and mounting section are in a super-elastic state, while the middle section is in a heat-activated state, allowing it to bend at room temperature and maintain its bent angle. This invention, by selecting nickel-titanium alloy material and combining it with an ultra-thin-wall structure design, achieves large-diameter adhesive flow within a standardized outer diameter, significantly reducing adhesive resistance and solving the problems of easy clogging and low dispensing efficiency in traditional needles. Through segmented differentiated heat treatment processes, the needle tube angle can be freely adjusted and shaped, solving the problem that existing fixed-angle needles cannot adapt to complex dispensing points. It also possesses excellent fatigue resistance, significantly improving the service life and production yield of the dispensing needle.

The utility model relates to the technical field of downflow evaporation cold technology, and specifically provides a downflow integrated evaporation cold all-in-one machine, adopts the structural form of half coil pipe half filler to integrate upper and lower box bodies, a fan, a water spraying system and the like into an integrated device, which is different from the downflow evaporation cold structure of the past upper and lower split body, the all-in-one machine is designed according to the integral type, cancels the bottom frame structure, reduces product cost, forms an advantage in price, the filler is detachable, maintenance is convenient, is equipped with multiple small diameter fans (8 level motors), within the energy-saving range stipulated in the new national standard, can select primary or secondary energy efficiency motor according to customer demand, conforms to the development demand of the high-quality direction of the industry energy saving, water saving, high efficiency, low noise and the like. The appearance of the all-in-one machine is planned and designed according to the size of a container, satisfies the overseas market demand, is compact in structure, saves installation space, and is reliable in operation.

The invention belongs to the technical field of industrial ventilation air filtration, and particularly relates to a biodegradable air filter material for industrial ventilation, a preparation method and application. According to the biodegradable air filter material for industrial ventilation, the inertia interception layer, the high-dust-holding layer and the spunbond non-woven fabric are sequentially arranged in the air inlet direction, the inertia interception layer, the high-dust-holding layer and the spunbond non-woven fabric are all made of biodegradable materials, and the spunbond non-woven fabric can support and fix the high-dust-holding layer; the tensile strength and the dust holding capacity of the air filter material are improved by regulating and controlling the average diameter, the quantification, the thickness, the air permeability and other parameters of the fibers of the inertia interception layer and the high dust holding layer, and the air filter material is suitable for industrial ventilation.

This invention provides a highly integrated underground pressure regulating device, belonging to the field of gas pressure regulating boxes, comprising a ventilation venting signal tower and an underground pressure regulating box. The ventilation venting signal tower is connected to the underground pressure regulating box via a pipeline assembly. The underground pressure regulating box includes a box body and two integrated pressure regulating devices. The box body has two receiving cavities, each containing one integrated pressure regulating device. One side of the box body is connected to a main inlet pipe and a secondary inlet pipe, and the other side of the box body is connected to a main outlet pipe and a secondary outlet pipe. The main inlet pipe, one of the receiving cavities, and the main outlet pipe are connected; the secondary inlet pipe, the other receiving cavity, and the secondary outlet pipe are connected. An inlet valve is installed on each of the main and secondary inlet pipes, and an outlet valve is installed on each of the main and secondary outlet pipes. The purpose is to solve the problem of the large footprint of underground pressure regulating devices. The achieved technical effect is a reduction in the footprint.

The application discloses a multi-pass combined valve, and belongs to the technical field of valves.The valve comprises a valve body, one common pipeline and a plurality of branch pipelines arranged in the valve body; the common pipeline penetrates the valve body along the straight center of the upper and lower end faces of the valve body, and the end of the common pipeline located on one end face of the valve body is a common port, and the end of the common pipeline located on the other end face of the valve body is a common valve cavity; the plurality of branch pipelines are respectively connected with the common pipeline in the valve body; the plurality of branch pipelines comprise one inclined pipeline and a plurality of straight-through pipelines; one end of each straight-through pipeline is perpendicularly connected with the common pipeline, and an angle alpha is formed between the inclined pipeline and the common pipeline, and 0°< alpha < 90°. The inclined pipeline cooperates with the grouped straight-through pipelines, so that the size of the intersection nodes can be reduced, the medium residues and the flow dead angle can be reduced, the flow resistance and the processing difficulty can be reduced, the space utilization rate and the manufacturing cost can be considered, and the multi-system flow demand can be adapted.

This application discloses a cooling assembly for an electric motor, an electric motor, and a vehicle. The cooling assembly includes an inlet and an outlet arranged within a sealed cavity. Both the inlet and outlet are provided with cooling fluid inlets, forming a circulating flow channel within the motor and the sealed cavity. The middle section of the circulating flow channel is a disc-shaped cooling space, in which the cooling fluid directly contacts the winding unit. One of the orientations of the disc surface and the disc wall of the cooling space is the cooling fluid inflow direction, and the other is the cooling fluid outflow direction. In this application, the cooling fluid in the cooling space can form a diffuse inflow field surrounding the winding unit through the directional distribution of the inlet, ensuring sufficient contact between the cooling fluid and the winding unit. After heat exchange, the cooling fluid is led out by the outlet. The cooling fluid enters from the axial or circumferential end face of the cooling space and exits from the circumferential or axial end face, allowing the cooling space to cover the entire area of ​​the disc-shaped cooling space, significantly improving the heat dissipation effect.

The utility model relates to a hydraulic base which comprises a base body, a hydraulic flow channel is arranged in the base body, and the hydraulic flow channel comprises a hydraulic pump port connected with a hydraulic pump, a hydraulic motor port connected with a hydraulic motor and a channel enabling the hydraulic pump port and the hydraulic motor port to be communicated. And the channel is a round channel which is formed by drilling and has a smooth and straight inner wall. The utility model further relates to a wheel-side hydrostatic transmission continuously variable transmission which comprises a shell, a hydraulic pump, a hydraulic motor and a transmission gear set are arranged in the shell, and the hydraulic pump and the hydraulic motor are installed on the hydraulic base. According to the scheme, the hydraulic base and the wheel-side hydrostatic transmission continuously variable transmission have the advantages of being easy to manufacture, small in resistance of a liquid flowing channel and high in transmission efficiency, and are stable in performance and longer in service life.

The invention relates to the field of heat treatment furnaces, in particular to a heat treatment equipment anti-toppling vertical tube furnace which comprises a furnace body and further comprises an anti-toppling mechanism fixedly installed on the outer wall of the furnace body, the anti-toppling mechanism comprises a groove box fixedly connected with the outer wall of the furnace body, the groove box is vertically arranged, a rectangular groove opening of the groove box is formed towards the outer side of the furnace body, and the groove box is fixedly connected with the outer wall of the furnace body. A groove box is arranged in the furnace body, an inclined plate is arranged at the bottom of the groove box in the inclined lower direction away from the furnace body, an outer sleeve is connected into the groove box in a sleeved mode, the top end of the outer sleeve is hinged to the top of the groove box, an inner sleeve is connected into the outer sleeve in a sleeved mode, and the bottom end of the inner sleeve communicates with the atmosphere. According to the device, when the vertical furnace topples over, the inclination angle of the vertical tube furnace is taken as a triggering condition, and the anti-inclination mechanism can timely pop out to a set angle and is supported on the ground, so that the purpose of supporting and protecting the vertical tube furnace during toppling over is achieved; the problem that in the prior art, collision and toppling risks exist during special operation due to the thin and high appearance structure characteristic of a vertical tube furnace is effectively solved.

The present invention discloses a resistive salt bath heater, a manufacturing method and a use method, comprising a double-layer cylinder assembly, wherein the inner cavity of the double-layer cylinder assembly is provided with a coil assembly, and the inner cavity of the double-layer cylinder assembly is filled with molten salt; an explosion-proof heating core assembly is arranged on the double-layer cylinder assembly; a first metal tubular electric heating element is distributed in a ring shape on the outer side of the double-layer cylinder assembly. In the present invention, molten salt is used as a heat transfer carrier, the temperature difference between the cold source / heat source heat exchange surface is small, and the temperature field is uniform, which solves the problems of medium decomposition caused by uneven temperature field of heater equipment and local overheating, high product impurity rate, low production efficiency and high production cost, and can be widely used in many explosive gas / dust environments, has no safety hazards, and meets the needs of safe production.

The utility model discloses a straight-through type pipeline filter and belongs to the technical field of filters. The pipeline filter overcomes the defects of accumulation of filtered dirt, reduction of filtering area, increase of circulation resistance, short cleaning period of a filter element and difficulty in pipe arrangement and installation due to the fact that the filter element of a traditional pipeline filter in the prior art is arranged at the lower part. The main structure of the water purifier comprises a shell, an inclined filter element seat and a filter element mounted on the filter element seat are arranged in the shell, the side wall of the shell is provided with an inlet connecting pipe, an outlet connecting pipe and a sewage discharging assembly used for discharging sewage, the inlet connecting pipe is communicated with the interior of the filter element through a circulating hole in the filter element seat, and the exterior of the filter element is communicated with the outlet connecting pipe. And a detachable flange cover is mounted at the upper end of the shell. The filter is mainly used for filtering particulate matters in various liquid and gas media such as petrochemical engineering device conveying pipelines, power station boiler pipelines, pharmaceutical industry, domestic water supply and the like.

The present invention discloses an antibacterial mask capable of long-term continuous charge regeneration, comprising a mask body, ear straps, and a battery. The mask body adopts a multi-layer structure, which is sequentially a barrier layer, a sterilization layer, a filter layer, and a skin-friendly layer. The sterilization layer adopts a nano-silver layer to improve the antibacterial ability of the mask. The filter layer adopts a "semiconductor layer-insulating layer-semiconductor layer" structural design, and the two semiconductor layers are respectively connected to the positive and negative electrodes of an external battery. Static charge accumulates on the surface of the semiconductor layer to adsorb and filter out microorganisms and particles such as bacteria and viruses in the air; factors such as breath exhaled from the mouth when worn will cause static loss. The present invention uses a battery to continuously supplement the charge to maintain a stable ability to filter out pathogens. The antibacterial mask capable of charge regeneration of the present invention prevents dust particles, viruses, etc. from invading the human body through two methods: electrostatic capture and physical barrier, so that the mask maintains a high filtering capacity for a long time, saves a large amount of materials and resources, and has the characteristics of green environmental protection.

The invention discloses a cooling assembly of a motor, the motor and a vehicle, the cooling assembly comprises an inflow piece and an outflow piece which are arranged in a sealing cavity in the axial direction, the inflow piece and the outflow piece define a cooling space, and the inflow piece and the outflow piece are each provided with a cooling fluid flowing opening. The winding unit comprises a cooling space and an outflow part, the outflow part is arranged in the cooling space so that cooling fluid can be injected into and led out of the cooling space, at least part of the winding unit penetrates through the inflow part to stretch into the cooling space and makes direct contact with the cooling fluid in the cooling space, and the extension length of the outflow part in the axial direction is larger than the extension length of the inflow part in the axial direction. Cooling fluid can form a cooling fluid flow field wrapping the periphery of the winding unit through directional flow distribution of the flow inlet piece, the cooling fluid is led out through the flow outlet piece after heat exchange is completed, the heat dissipation effect is guaranteed, the axial extension length of the flow inlet piece is smaller than that of the flow outlet piece, the heat exchange area can be increased, the flow speed of the cooling fluid in the iron core gap can be increased, and the heat dissipation effect is enhanced.

The utility model discloses a high-mixing and high-efficiency injection molding screw rod and an injection molding machine. The injection molding screw rod comprises a mounting section, a blanking section, a separation section and a mixing section which are sequentially arranged in the conveying direction, the discharging section comprises a transition section and a conveying section, the discharging section is of a single-thread structure, and the thread pitch of the discharging section is kept unchanged; the bottom diameter of the transition section is gradually reduced, and the bottom diameter of the conveying section is kept unchanged. According to the high-mixing and high-efficiency injection molding screw provided by the utility model, the transition section is gradually reduced along the conveying direction, so that larger stress concentration caused by sudden change of the shaft diameter at the intersection of the mounting section and the blanking section is avoided, the risk that the position is twisted off is greatly reduced, and the anti-fatigue characteristic and the reliability of the screw are improved. Meanwhile, due to the existence of the transition section, the depth of the discharging groove can be properly increased, and the conveying capacity of raw materials of the discharging section is improved.

This utility model provides a low-temperature storage device for rice, relating to the technical field of low-temperature rice storage. It includes a low-temperature storage component, which internally houses a spiral assembly and a tilting assembly. An insulation component is located on the inner side of the low-temperature storage component. The low-temperature storage component includes a storage tank, with a ventilation pipe inside the storage tank. The spiral assembly includes a motor, with a drive shaft mounted at the bottom of the motor. A spiral conveyor is located outside the drive shaft, and a scraper is mounted at the bottom of the spiral conveyor. This utility model uses an electric motor to drive the drive shaft, which in turn drives the spiral conveyor. The scraper helps to scrape up the rice on the partition, and the spiral thrust of the conveyor pushes the rice at the bottom upwards, breaking up the dense layer formed at the bottom of the storage tank and promoting the circulation of cold air inside the storage tank, thereby ensuring storage quality.

The invention provides a reversing fan, an engine and a working method, relates to the technical field of engine cooling, and aims to solve the problem that a displacement sensor in an existing reversing fan is in a high-pressure oil environment for a long time, so that the detection precision and efficiency are insufficient. The internal space of the shell is effectively divided into the hydraulic working cavity and the isolation detection cavity which are isolated through fluid by means of the piston and the sealing assembly, the hydraulic working cavity is specially used for bearing high-pressure hydraulic oil to drive the piston to generate axial displacement and be in linkage with fan blade variable pitch, and leakage of the hydraulic oil is blocked through the sealing assembly; the displacement sensor assembly arranged in the isolation detection cavity can perform displacement reading in a pressure-free and oil-free dry environment, so that the sensor is prevented from being impacted by hydraulic oil pressure and soaked by fluid, and the accuracy and the operation stability of piston displacement detection are improved; and the service life of the electronic component is effectively prolonged.

The present invention provides an air guide ring and an electric control box assembly, a ceiling unit and an air conditioner; the air guide ring and the electric control box assembly are used for ceiling units, and include: an air guide ring, with an air guide channel and an air guide side in the middle; an electric control box, connected to the air guide ring at the air guide side; an inner side plate of the electric control box is provided on the side of the electric control box close to the air guide channel; wherein the distance from the inner side plate of the electric control box to the center of the air guide channel is greater than the radius of the air guide channel; the distance from the middle of the inner side plate of the electric control box to the center of the air guide channel is less than the distance from the opposite ends of the inner side plate of the electric control box to the center of the air guide channel. The ventilation resistance on the air guide side is reduced, so that the airflow in the air guide channel is more uniform, so as to reduce the noise generated when the air conditioner is running and improve the user experience.

The utility model discloses a novel flushable filter which comprises a rack, an air outlet is formed in the upper end of the rack, and an air inlet is formed in the lower end; a filtering piece is fixedly mounted on the rack; a water collecting tray is fixedly mounted on the rack and is positioned right below the filtering piece; at least one group of closing blocking mechanisms are arranged on the water collecting tray; each group of closed blocking mechanism comprises a blocking plate and a push-pull unit; the multiple blocking plates are rotationally connected with the water collecting disc. The push-pull unit drives the barrier plate to rotate; through grooves which are matched with the barrier plates and are through up and down are formed in the water collecting tray; the barrier plates are used for blocking the corresponding through grooves; by means of the through groove formed in the water collecting tray, when moving from bottom to top, gas moves upwards through the through groove in the water collecting tray, and circulation resistance of airflow is reduced; and the problem that the service life of the filtering piece is shortened due to inconsistent dust attachment degrees at the periphery and the center of the filtering piece is avoided.

The utility model particularly relates to an electric purification and dust collection device which is arranged to be of a window frame structure and comprises a frame, an electric purification and dust collection device, a dust collection device and an electric purification and dust collection device, and the frame is arranged to be of a hollow structure defined by peripheral frame plates; the discharge electrode is arranged on the first side of the peripheral frame plate; the grounding electrode is arranged on the second side, opposite to the first side, of the peripheral frame plate, and an ionization area is formed at the hollow structure between the discharge electrode and the grounding electrode; and the dust collection layer is arranged on the peripheral frame plate and located in the ionization area, and the dust collection layer is arranged to collect dust in the ionization area. According to the electric purification and dust collection device, the discharge electrode and the grounding electrode are integrated on the frame of the electric purification and dust collection device, so that an ionization area can be formed in the frame, dust in the frame is absorbed by the dust collection layer under the condition that the dust is fully ionized, and the technical effects of lightness, thinness and high efficiency of the electric purification and dust collection device are achieved.

The utility model discloses a kind of hot air uniform distribution structures of circulating oven, it is related to circulating oven technical field.The utility model includes oven body, rotatingly connected with rotating lever in oven body, the surface of rotating lever is fixedly connected with deflector, oven body one side is fixedly connected with shell, shell one side is fixedly connected with transmission motor.The utility model is set through transmission motor, can drive reciprocating screw rod to rotate, to drive threaded sleeve and connecting plate transverse movement, make scraper automatic cleaning dust on the surface of filter plate, effectively reduce hot air flow resistance, maintain the high efficient heat exchange performance of circulating oven, simultaneously, the gear plate of moving plate bottom is engaged transmission with gear, to drive rotating lever and deflector periodic swing, make hot air form dynamic uniform distribution in oven, avoid local overheating or drying uneven problem, not only improve the uniformity and stability of hot air distribution, can also reduce energy consumption.

A heat exchange spoiler structure and a gas water heater for avoiding a fan belong to the technical field of household appliances. In the spoiler structure, the spoiler is arranged between the fan and the heat exchanger, and the spoiler includes a plurality of through smoke holes and a heat exchange flow channel arranged in the shell of the spoiler. The heat exchange flow channel is respectively provided with a water inlet and a water outlet, and the heat exchange flow channel is connected with the water flow channel of the heat exchanger. The spoiler also has a step portion that sinks toward the heat exchanger; a smoke collection channel is arranged between the air intake of the fan and the smoke outlet of the heat exchanger, and the smoke collection channel includes a first flow area located below the fan and a second flow area located in other parts, and the first flow area has a resistance reduction opening that the spoiler cannot cover. The heat exchange spoiler structure can make the heat exchange more sufficient on the basis of drainage balance, thereby improving the utilization rate of heat.

The invention relates to the technical field of unmanned aerial vehicles, and discloses a multi-rotor unmanned aerial vehicle flight control IMU damping structure which comprises an IMU module shell and an IMU body. The IMU module shell is internally provided with an IMU main body, the upper surface of the balancing weight and the lower surface of the IMU main body are each provided with a first PVC sheet, the face, away from the IMU main body, of each first PVC sheet is provided with damping foam, and the upper surface, close to the inner top of the IMU module shell, of each damping foam is provided with a second PVC sheet. The damping effect on the IMU main body can be improved through the damping foams, the first PVC sheet and the second PVC sheet, the IMU main body, the balancing weight, the upper damping foam and the lower damping foam are assembled into an integrated structure through an isolation type structure, the integrated structure is isolated from an unmanned aerial vehicle body to form a certain isolation space, vibration transmission can be effectively reduced, and the damping effect of the IMU main body can be effectively improved through the damping foams. The weight is light, the cost is lower, and the weather resistance and the temperature resistance are better.

This invention belongs to the field of tobacco paper technology, and provides a formed paper for use in paper filter rods and its preparation method. The formed paper has a three-layer gradient porous composite structure, including a permeable support layer, a high-efficiency adsorption layer, and a liquid-locking and anti-seepage layer stacked sequentially, with interconnected pores between the layers. The permeable support layer is formed from a permeable support layer slurry, the raw materials of which include low-beaten softwood pulp and cationic starch, obtained through gelatinization. The high-efficiency adsorption layer is formed from a high-efficiency adsorption layer slurry, the raw materials of which include enzymatically modified grafted fibers, tobacco-derived modified porous carbon carrier, tourmaline powder, and a foaming agent, obtained through a wet compounding and foaming process. The liquid-locking and anti-seepage layer is formed from a liquid-locking and anti-seepage layer slurry, the raw materials of which include enzymatically modified grafted fibers and modified pectin-chitosan composite adhesive, obtained through mixing and dispersion. This invention features high permeability, high tar selective adsorption rate, and high aroma retention rate.

The application provides a structure for reducing the flow resistance of a bearing cavity ventilation pipe, wherein the ventilation pipe is configured with an oil blocking structure protruding from the bearing cavity wall surface by a predetermined distance at one end of the ventilation pipe extending into the bearing cavity, the oil blocking structure is used for blocking the lubricating oil of the bearing cavity wall surface from entering the ventilation pipe along the ventilation air, and the lubricating oil of the bearing cavity wall surface cannot enter the ventilation pipe by gravity after being blocked. The scheme provided by the application significantly reduces the lubricating oil entering the ventilation pipe, significantly reduces the flow resistance of the ventilation pipe without increasing the diameter of the ventilation pipe, is beneficial to reducing the pressure of the bearing cavity, improves the sealing pressure difference under the condition that the sealing induced air pressure is the same, and prevents lubricating oil leakage.