32results about How to "Increase air intake" patented technology

The invention relates to the technical field of pipeline repairing, and discloses a drainage pipeline non-excavation repairing airbag and a repairing method thereof.The drainage pipeline non-excavation repairing airbag comprises an inner bag and an outer bag, the outer bag and the inner bag are integrally manufactured, and a plurality of adjusting assemblies are arranged between the inner bag and the outer bag and comprise first air inlet pipes; the inner diameter of the first air inlet pipe is sequentially increased in the axis direction, an air blocking column is slidably connected to the interior of the first air inlet pipe, the diameter of one end of the air blocking column is consistent with the inner diameter of the lower end of the first air inlet pipe, an exhaust groove used for air circulation is formed in one end of the air blocking column, and the outer bag is located on the outer side of the inner bag. An air inlet assembly is arranged in the inner bag; under the action of the adjusting assembly, the air inflow is adjusted or air inflow is stopped according to the actual situation, when the interior of the repaired pipeline is concave, the air inflow is increased to enable the outer bag to expand again, repairing materials are more attached, and when the interior of the repaired pipeline is convex, the air inflow is reduced, and the situation that the outer bag is damaged due to too large air pressure is prevented.

The invention belongs to the technical field of internal combustion engine power devices, and discloses a double-piston mechanism for an internal combustion engine, which comprises a cylinder body, and more than one cylinder is arranged in the cylinder body; an air inlet seat and an air outlet seat are installed on the upper portion and the lower portion of the cylinder body respectively, an air inlet pipe and an air outlet pipe are arranged in the air inlet seat and the air outlet seat respectively, and an air inlet channel and an air outlet channel are arranged in the air inlet pipe and the air outlet pipe respectively. A control device for gas distribution is arranged at the corresponding position of each cylinder; a high-pressure oil pump is arranged outside the cylinder body, and the high-pressure oil pump is communicated with the oil sprayer through a high-pressure oil pipe; a piston assembly I and a piston assembly II are symmetrically arranged in each cylinder body, and a bevel gear set I and a bevel gear set II which are matched with the piston assembly I and the piston assembly II to transmit power are further arranged in each cylinder body. The power performance of the internal combustion engine can be improved through the two piston assemblies, the device is small in size and light in weight, and single-machine fuel consumption and operation cost are effectively reduced.

This invention provides an aircraft ram air intake system and control method. The system includes a ram air intake and an emergency ram air regulating valve. The upstream side of the ram air intake is connected to the outside atmosphere, and the downstream side is connected to a heat exchange ram air line and an emergency ram air line. The heat exchange ram air line is arranged to provide heat exchange ram air, and the emergency ram air line is arranged to provide emergency ram air to the aircraft cabin. The emergency ram air regulating valve is arranged in the emergency ram air line to control the on / off state of the emergency ram air line. The aircraft ram air intake system according to this invention is more economical and safer, and also improves the comfort of the aircraft cabin.

This invention relates to a multi-stage interception and automatic impurity removal wastewater treatment device, comprising: an impurity removal chamber, wherein a filter screen is provided inside the impurity removal chamber and a filter screen cleaning mechanism is provided on the outer side wall; a collection chamber, wherein an opening and closing mechanism is formed inside; and a disinfection chamber, wherein a disinfection mechanism is provided inside. The beneficial effects of this invention are: by providing a multi-stage filter screen with progressively smaller pore sizes at the top of the impurity removal chamber, the device's removal effect on solid impurities in wastewater is enhanced; by providing a filter screen cleaning mechanism, the self-cleaning ability of the filter screen is improved, solving the problems of easy clogging and time-consuming and laborious filter screen cleaning in traditional water treatment equipment, effectively improving the automation level and continuous operation capability of the device; by providing a disinfection mechanism, the air intake of the device and the probability of air ionization are increased, improving the air ionization efficiency, thereby increasing the concentration of active purification components in the disinfection gas; making disinfection more thorough and effective, and improving the disinfection effect of the device.

The utility model provides a cooling device for PU foaming wheel manufacturing, and relates to the field of PU foaming wheel production equipment, the cooling device comprises a shell mechanism, the main body of the shell mechanism is of a structure with a one-way opening at the front end, a partition plate assembly is fixedly connected in the opening at the front end of the shell mechanism, and two through holes are formed in the partition plate assembly; four filter screen assemblies are fixedly connected into the through hole and continuously operate under the driving of the servo motor A through the conveying assembly, so that the foaming wheel can pass through the cooling cavity without pause, the limitation of traditional limiting cooling is broken through, the single cooling time is shortened by about%, and meanwhile, due to forced convection heat dissipation formed by the servo motor B and the fan blade assembly, the cooling efficiency is greatly improved. And in cooperation with circulating filtration of the filter screen assembly, a stable low-temperature airflow environment is kept in the cooling cavity, compared with natural cooling, the efficiency is remarkably improved, the overall production period is remarkably shortened, and the requirement for batch production is met.

This utility model relates to the field of moxibustion jar technology and discloses a moxibustion jar including a movable lid. A gas regulating component is provided on the top of the movable lid, and the gas regulating component includes a rotating plate rotatably connected to the top of the movable lid. Multiple guide grooves are formed on the surface of the movable lid, and fixed rods are slidably connected to the inner walls of each guide groove. The tops of the fixed rods are fixedly connected to the bottom of the movable lid. Multiple vent holes are formed inside both the movable lid and the rotating plate, and the vent holes are distributed in a circumferential pattern. A distance adjusting component is provided at the bottom of the rotating plate. In this utility model, rotating the rotating plate causes the fixed rods to slide in the guide grooves, simultaneously causing the vent holes to rotate. When the rotating plate aligns with the vent holes of the movable lid, the air intake channel opens, allowing more air to enter the fixed lid, increasing the air intake volume, thereby controlling the burning rate of the moxa stick. This solves the problem of inconvenient temperature adjustment in moxibustion and improves the user experience.

The electric variable-frequency vibroflot comprises a vibroflot head, a shell and a variable-frequency motor, a main shaft is arranged in the shell, an upper bearing and a lower bearing are installed between the upper portion and the shell and between the lower portion of the main shaft and the shell respectively, a collecting groove is formed in the upper end of the vibroflot head, the main shaft is connected with the variable-frequency motor through an elastic coupler, and the variable-frequency motor is connected with the shell. A gas conveying flow channel is arranged in the output shaft, a gas inlet communicated with the gas conveying flow channel is formed in the side wall of the upper end of the output shaft, a gas conveying flow channel is arranged in the main shaft, a gas outlet communicated with the gas conveying flow channel is formed in the side wall of the upper portion of the main shaft, the gas outlet and the gas conveying flow channel are both communicated with the oil way channel, and a gas conveying pipe communicated with the gas conveying flow channel is arranged in the gas conveying flow channel. The side wall of the main shaft is provided with an air outlet flow channel opposite to the eccentric block, and the air outlet flow channel communicates with the air conveying pipe and is located above the liquid level of the lubricating oil. According to the invention, the heat dissipation effect of the variable frequency motor can be improved, and the bearing can be well lubricated.

The application discloses a motorcycle, which comprises a frame, a body cover, a walking assembly and a power assembly. The walking assembly comprises a rear wheel, and the power assembly comprises an engine, an air filter and an air inlet pipe. The air inlet pipe comprises a left air inlet pipe and a right air inlet pipe which are distributed along the width direction of the motorcycle. The left air inlet pipe comprises a left air inlet part which extends along the length direction of the motorcycle. The right air inlet pipe comprises a right air inlet part which extends along the length direction of the motorcycle. In the height direction of the motorcycle, a horizontal plane perpendicular to the height direction of the motorcycle is defined. The projection of the left air inlet part on the horizontal plane extends along a first straight line, and the projection of the right air inlet part on the horizontal plane extends along a second straight line. The included angle between the first straight line and the second straight line ranges from 14° to 22°. Through the above arrangement, the air intake efficiency of the air inlet pipe can be improved.

The invention relates to the technical field of automobiles, in particular to an air-inlet grille device and a vehicle. Wherein the outer matching piece is provided with an air inlet, the first grating and the second grating are oppositely arranged on the two sides of the air inlet in the set direction, the first crank and the second crank are both rotationally connected with the outer matching piece, the first grating is installed on the second crank, and the second grating is installed on the first crank. The first driving assembly is used for driving the second crank and driving the first grille to rotate, the second driving assembly is used for driving the first crank and driving the second grille to rotate, when the first grille is located at the first opening position and the second grille is located at the second opening position, the air inlet is opened, and the first grille and the second grille are both located on the outer side of the air inlet. When the first grid is located at the first closing position and the second grid is located at the second closing position, the first grid and the second grid seal the air inlet. The air inlet grille device can increase the air inlet amount, avoid the air flocculation phenomenon, reduce the wind resistance and improve the heat dissipation performance.

The invention discloses a pulse large-bubble aeration tank for sewage treatment. The pulse large-bubble aeration tank comprises a frame; the outer wall of the air inlet pipe is fixedly connected with the outer walls of the two sides of the frame; the bottom of the expanding and exposing mechanism is connected with the inner wall of the top of the frame in a sliding manner; the top of the aeration mechanism is in sliding connection with the outer wall of the frame; the invention relates to the technical field of sewage treatment, the aeration mechanism is arranged, gas presses out liquid in an aeration pipe and a gas outlet pipe to form a gas cavity, the liquid level in the aeration pipe is reduced, the gas is discharged under the driving of the liquid level difference due to the fact that the gas outlet pipe is communicated with a communicating groove in an aeration cover through a through groove, and the aeration efficiency is improved. After the gas is discharged, the liquid at the bottom is filled upwards and enters the aeration pipe through the gas inlet groove to fill the pipeline, and then the liquid is discharged again under the condition that the gas continuously enters, so that alternate generation of large bubbles and large liquid blocks is realized, and the purpose of the pulse large-bubble aeration tank for sewage treatment is achieved.

The utility model discloses an engine oil tank heating system, and relates to the technical field of vehicle engineering. Comprising an oil tank body, vortex tubes and an air inlet assembly. Heating pipes are distributed in the oil tank body; the vortex tube is provided with an air inlet port and a hot end outlet; the air inlet assembly is connected with the air inlet port, and an air inlet of the heating pipe is connected with the hot end outlet; the gas inlet assembly is used for conveying gas to the gas inlet port, the gas is divided into high-temperature gas and low-temperature gas in the vortex tube, and the high-temperature gas is output into the heating tube through the hot end outlet and used for heating the interior of the oil tank body. The low-temperature diesel oil in the oil tank body does not need to be replaced, the running cost of a vehicle is saved, and the paraffin precipitation phenomenon of the oil liquid under the cold condition is avoided; and the whole system is simple in structure, the vehicle heating time is shortened, and the heating efficiency is improved.

The utility model relates to air flow optimization technical field, and disclose the spinning cup air flow optimization device of air flow spinning machine, including spinning cup, the bottom of spinning cup is provided with the base, the inside of spinning cup is close to the top and is provided with the air intake adjusting assembly, the inside of spinning cup is close to the bottom and is provided with the air flow steady pressure subassembly. The spinning cup air flow optimization device of air flow spinning machine, through being provided with air intake adjusting assembly, can adjust the angle of louver blade, the turning angle of adjacent upper and lower two layers louver blade is mutually complementary and is set up, when needing to increase the air flow intensity, the blade is adjusted to the larger inclination angle, increases the air intake amount, if wants to optimize the air flow stability, then adjusts the blade angle and makes the air flow more gently enter the spinning cup, to adapt to different fibre raw material and spinning process demand, makes the spinning cup inside can set up the air flow adjusting part, can improve the air flow distribution and stability in the spinning cup, the quality and yield of yarn are high.

The application relates to an active air intake grille and a vehicle, which comprises a grille frame, the grille frame comprising an air inlet and a mounting boss for supporting a front bumper; a vane group is arranged in the air inlet, the vane group being located between a cooling module and the front bumper, and two end portions of the vane group being located on two sides of the cooling module; a wind deflector is arranged around the air inlet and extends towards the front bumper, the wind deflector being made of soft material; and the wind deflector is located below the mounting boss. The application can improve the air intake amount and cooling performance of the grille and enhance the pedestrian protection function.

The utility model discloses a kind of active air intake grille structures of saving Y direction space, it is related to active air intake grille structure technical field.The utility model includes active air intake grille body, active air intake grille body center is provided with execution motor, active air intake grille body center is fixedly connected with connecting bracket, connecting bracket is set in execution motor upper side, connecting bracket inside is provided with plastic peg, connecting bracket and execution motor are fixedly connected by plastic peg, execution motor left side and right side are inserted with output shaft, the output shaft is commonly provided with two.The utility model directly transmits rotary kinetic energy to active vane-left and active vane-right by setting active vane-left, specifically active vane-left and active vane-right have included angle in Y direction, avoid the problem of torque loss caused by the rotation of most of the market due to connecting rod driven blade, realize efficient transmission.

The application discloses an all-terrain vehicle, which comprises a frame, a vehicle body cover, a walking system, a power assembly and a heat dissipation assembly, the vehicle body cover comprises an air inlet grille located at the front of the frame and a front cover for mounting the air inlet grille, the front cover is arranged around the air inlet grille, the walking system is at least partially located below the frame, the power assembly is supported by the frame and is in transmission connection with the walking system, and the heat dissipation assembly comprises a radiator located behind the air inlet grille, the front cover is provided with a heat dissipation hole capable of conveying external air to the radiator, the heat dissipation hole is located above the air inlet grille and at least partially faces the front of the all-terrain vehicle, and along the length direction of the frame, the heat dissipation hole at least partially overlaps the radiator. Through the arrangement, the heat dissipation efficiency of the all-terrain vehicle can be improved.

The application relates to a gas stove and a burner thereof. The burner comprises an ejector pipe group and a damper end plate. The ejector pipe group has an air inlet end and an air outlet end, and a booster hole is arranged in the side wall of the ejector pipe group close to the air inlet end; the damper end plate is arranged at the air inlet end of the ejector pipe group, and a primary air inlet hole and a gas hole are arranged in the damper end plate. External air can be sucked into the ejector pipe group through the booster hole and the primary air inlet hole at the same time, the booster hole is used for increasing the air intake amount, facilitating further promotion of combustion, improving the combustion efficiency and reducing the CO emission amount. The booster hole is arranged in the side wall of the ejector pipe group close to the air inlet end, and the primary air inlet hole is arranged on the damper end plate, that is, the air flow direction of the air entering from the booster hole is different from the air flow direction of the air entering from the primary air inlet hole. Therefore, when the two air flows flow into the ejector pipe group at the same time, the two air flows collide and mix, the air and the gas are fully mixed, the combustion efficiency is improved, and the CO emission amount is reduced.

The application discloses a self-cooling computer case of drawing type, and relates to the technical field of computers. The self-cooling computer case of drawing type comprises a box body and a drawing mechanism. The cooling mechanism is installed at the position close to the cooling fan in the inside of the box body. The top of the inside surface of the box body is provided with an auxiliary assembly. The drawing mechanism comprises a linear guide rail and an L-shaped hook. The top of the linear guide rail is slidably provided with a lower supporting plate. The bottom end of the L-shaped hook is slidably provided with an upper supporting plate. The edge side of the surface of the lower supporting plate is fixedly provided with a right-angle-shaped rod. The top of the surface of the right-angle-shaped rod is fixedly provided with a supporting sleeve. The edge side of the bottom of the upper supporting plate is fixedly provided with a guide connecting rod. The guide connecting rod and the supporting sleeve are slidably arranged. The end, away from the right-angle-shaped rod, of the upper supporting plate is fixedly provided with a rectangular baffle. The self-cooling computer case of drawing type has the advantages of achieving the drawing purpose, adopting the stepped installation, realizing the drawing type, being convenient to install, disassemble, maintain, being not prone to high temperature, and being safe and reliable.

The invention relates to the technical field of waste gas treatment devices, and discloses a waste gas treatment device for processing and production of a conveying belt, which comprises a rotary air filling structure rotationally mounted at the center of an air sterilization cavity, and an inclined fin plate which does circular motion along with a rotor of the driving motor and sucks peripheral gas into a central area in the rotating process is arranged in the driving motor. The waste gas treatment device for processing and production of the conveying belt is placed in an area with high waste gas concentration, gas can be sucked from the periphery in a filtering manner, so that the gas is filtered, the gas inlet amount of the gas is increased, in addition, the waste gas after preliminary filtration can be guided to the position near a high-energy UV light beam tube, and the waste gas can be discharged from the high-energy UV light beam tube. And therefore, the high-energy UV beam tube can sterilize surrounding waste gas in a large range, and the working efficiency of the equipment is improved.

The utility model relates to an adjacent valve linkage air supply device used in a pneumatic ash conveying system, which comprises at least two air supply valves, two chambers are arranged in each air supply valve, and piston components which push each other are arranged in the two chambers; one side of the same chamber of each gulp valve is connected with a gas conveying pipeline, and the other side of the same chamber of each gulp valve is connected with an ash conveying pipeline; different cavities of every two adjacent gulp valves are connected through a pressure transmission pipe. According to the utility model, the pressure of the ash conveying pipeline is gradually reduced at a constant speed along the flow direction, the blockage of the ash conveying pipeline is eliminated, and the consumption of compressed air can be reduced.

The utility model relates to the technical field of compressors, and discloses a conveniently overhauled compressor case which comprises a base, a front cover fixedly connected to the right side of the top of the base, a sound insulation support fixedly connected to the right side of the top of the base, an air inlet duct fixedly connected to the top of the sound insulation support, and a top cover fixedly connected to the top of the front cover. A cooler is installed at the bottom of the top cover, a wind scooper is fixedly connected to the bottom of the cooler, an axial flow fan is installed at the bottom of the wind scooper, a machine cover is tightly attached to the left side of the front cover, and a connecting mechanism is arranged on the front side of the front cover. According to the compressor case, airflow is guided to enter the air filter in a concentrated and accelerated mode through the second ventilation filter screen and the air inlet duct, the air inlet amount of the air filter is improved, vibration generated when the compressor operates is attenuated through the sound insulation support, and therefore noise generated when the compressor operates is reduced while the air inlet efficiency of the compressor case is improved.

This invention discloses a stepless adjustable air supply device, comprising a sleeve and a fan. At least three conical reducing pipes are arranged inside the sleeve. Each conical reducing pipe has an adjusting ring fitted on its outer wall. A coiled sleeve is fitted on the top of each conical reducing pipe, and an elastic band that continuously tightens inwards is fitted on the outer surface of the coiled sleeve. The adjusting rings are controlled by an electromagnetic plate, on which a permanent magnet ring is placed, fitted around a guide column, and the adjusting ring is supported on the top surface of the permanent magnet ring. A polling air supply plate and a docking plate are arranged at the end of each conical reducing pipe facing the fan. An adjusting shaft is arranged between the conical reducing pipes. The adjusting shaft cooperates with an adjusting wheel, a first driving wheel, a rotating wheel frame, a second driving wheel, and a sliding rheostat. When the rotating wheel frame rotates, it changes the resistance value of the sliding rheostat, thereby causing the sliding ring at the end of the adjusting shaft to move. This air supply device easily achieves multi-dimensional stepless adjustable air supply, and can achieve precise control through multi-directional polling air supply driven by a single fan.

A structure for improving high-speed performance of a turbocharger with a fixed nozzle ring relates to the technical field of engine appliances and comprises a turbine shell, a turbine rotor is rotatably arranged in the turbine shell, the turbine shell is fixedly provided with the nozzle ring at the wheel back of the turbine rotor, and an external cavity is formed in the turbine shell. A turbine shell inlet hole communicating with the outer cavity is formed in the inner wall of the turbine shell, a turbine shell return hole communicating the outer cavity with the turbine shell inner cavity is further formed in the turbine shell, and a piston controlling connection and disconnection of the turbine shell inlet hole and the turbine shell return hole is arranged in the outer cavity in a self-adaptive sliding mode. The problems that according to a turbocharger with a fixed nozzle ring in the prior art, under the high rotating speed and the high expansion ratio of the turbocharger, due to the fact that the flow area of a turbine is fixed, waste gas of an engine cannot smoothly enter a turbine rotor, the turbine is blocked, the performance of the turbocharger is reduced, and the power of the engine is insufficient are solved.

The invention belongs to the technical field of automobile parts, and particularly relates to an automobile grille which comprises a grille shell, a flow guide component, an intercepting groove and a driving assembly, the flow guide component is arranged in the grille shell and comprises a sliding baffle and a flow guide telescopic assembly, and the two ends of the sliding baffle are slidably connected with the two opposite sides of the grille shell; the flow guide telescopic assembly is rotationally connected with the inner wall of the grille and slidably connected with the sliding baffle, the intercepting groove is formed in the grille shell, the two ends of the intercepting groove are connected with the grille shell, and the driving assembly is arranged on the grille shell and used for driving the sliding baffle to slide and driving the flow guide telescopic assembly to rotate and stretch out and draw back. Under the driving of the driving assembly, the sliding baffle slides to drive the telescopic flow guide part to incline, rainwater entering the automobile grille is guided into the intercepting groove to be intercepted and filtered, airflow enters the grille, and the automobile grille can adjust the air inlet amount and can intercept the rainwater penetrating through the grille.

The application provides a turbocharging device and a vehicle, wherein the turbocharging device comprises an engine, an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with an air inlet of the engine, the air outlet pipe is communicated with an air outlet of the engine; a compressor is arranged on the air inlet pipe, the compressor is used for pressurizing the gas in the air inlet pipe; a turbocharger is arranged on the air outlet pipe; an electric motor, a rotating shaft of the electric motor is connected with a rotor shaft of the compressor through a first connecting shaft; a generator, a rotating shaft of the generator is connected with a turbine shaft of the turbocharger through a second connecting shaft; a clutch is arranged between the rotating shaft of the electric motor and the rotating shaft of the generator, the clutch has an engaged state of connecting the rotating shaft of the electric motor with the rotating shaft of the generator and a disconnected state of disconnecting the rotating shaft of the electric motor from the rotating shaft of the generator. The technical scheme of the application effectively solves the problem that the turbocharging system in the related art makes the response speed of the engine slow during acceleration.

The present invention belongs to the field of petrochemical industry, and specifically provides a special fuel suitable for strengthening compression ignition engines, wherein the special fuel is composed of coal-based diesel, tripropylene glycol methyl ether, anti-wear agent, antioxidant and metal corrosion inhibitor. Compared with traditional automotive diesel, the special fuel has a higher cetane number, better lubricity and higher oxygen content; it ensures that the power performance can still be improved at the maximum throttle opening of the strengthened engine, and also ensures that the engine does not detonate under high load; better lubricity can reduce the wear and blockage of precision parts such as diesel engine injector needle valve pairs and fuel injection nozzles, and improve the running stability of the engine. At the same time, it does not contain a cetane number improver, which avoids the disadvantages of the special fuel in a closed and poor light-shielding condition, such as the decomposition of the cetane number improver, and the increase of fuel acidity to corrode metal parts.

The invention discloses an overheat self-adjusting communication cabinet, and relates to the field of cabinets, the overheat self-adjusting communication cabinet comprises an outer frame, a bottom plate, a top plate and an inner frame, the bottom plate is fixedly installed at the lower end of the outer frame, the bottom plate is fixedly installed at the upper end of the outer frame, the inner frame is fixedly installed between the bottom plate and the top plate and located on the inner side of the outer frame, and the inner frame is fixedly installed at the lower end of the outer frame. A motor mounting frame is fixedly mounted on one side of the inner frame, and an adjusting motor is fixedly mounted on one side of the motor mounting frame. The upper placing frame, the lower placing frame and the top frame are pushed to expand, interlayer gaps are increased, the heat dissipation area is enlarged, heat is easier to dissipate, when the placing frames expand, the air holes are automatically opened and matched with the air inlet fan to form an efficient air flow path, a heat dissipation air channel is further optimized, and after the lower placing frame and the top frame expand, the heat dissipation efficiency is improved. The air inlet fan is right located on the other side of the gap between the multiple sets of placing frames and the top frame, and the synergistic effect of the air inlet fan and the expansion gap is achieved.

The invention relates to the technical field of computer hosts, in particular to a hollowed-out efficient heat dissipation miniature game computer host which comprises a main body frame, side installation structures used for being connected with wire harnesses are installed at the two ends of the main body frame correspondingly, one side of the main body frame is of an open structure, and a movable box is slidably connected to the inner wall of the main body frame; heat dissipation holes are formed in the outer wall of the movable box, and a reciprocating driving structure perpendicular to the movable box is fixedly connected to the inner wall of the movable box. By adopting a similar piston type structure, the air inlet amount is increased, the air inlet stability is ensured, the internal space is increased during heat dissipation, the circulation of internal air is promoted, the heat dissipation effect on all internal elements can be ensured even if the internal integration degree is relatively high and the elements and the mainboard occupy basically all the spaces, and the heat dissipation efficiency is improved. And compared with the noise generated by air sliding during rotation of the fan, the noise generated by the heat dissipation mode is lower.

The open type range hood comprises a front panel, a machine shell and an impeller arranged in the machine shell, the machine shell is connected with the front panel, the front panel comprises an upper panel and a lower panel, the lower panel is provided with an oil smoke inlet, one part of the impeller is exposed out of the oil smoke inlet, and the other part of the impeller is covered by the upper panel. The open type range hood further comprises a flow guide part, the flow guide part is connected to the front panel and located between the upper panel and the part, covered by the front panel, of the impeller, the flow guide part at least comprises a first arc-shaped section close to the periphery of the impeller and a second arc-shaped section close to the axis of the impeller, and the arc top of the first arc-shaped section faces the front panel. The arc top of the second arc-shaped section faces the impeller and is spaced from the impeller. The flow guide part can better guide airflow to the periphery of the impeller, generation of vortexes is avoided, the arrangement of the flow guide part optimizes an air flowing path, generation of flowing dead zones and the vortexes is reduced, and the oil smoke suction effect and the air inlet efficiency of the draught fan are improved.

According to the technical scheme, the sinking type air inlet mechanism is characterized in that an air filter installation support is arranged in a vehicle body, a connecting block is arranged on the top face of the air filter installation support, an air filter is fixedly installed on the top face of the connecting block, the air filter installation support is made of Q235A carbon steel, and the air filter installation support is made of stainless steel. The air filter installation support is composed of a connecting plate inclined in the vertical direction, a horizontal plate at the top end and a fixing plate with the bottom end perpendicular to the connecting plate, through the design of the air filter, the air filter can serve as the most important filtering equipment of an air inlet mechanism, the purity and safety of inlet air are guaranteed, and through the design of the air filter installation support, the air filter installation support is convenient to use. Low-position installation of the device body can be achieved, compared with traditional high-position air inlet, an air inlet channel of the device is shortened and is not limited by the sectional area of a pipeline, meanwhile, the air inlet amount is increased, the air inlet resistance is effectively reduced, and due to the design of the second air inlet pipe, it can be guaranteed that the pipeline has enough length to buffer sucked air through the design of a straight pipe and an arc-shaped pipe.