31results about How to "Reduce airflow" patented technology

The invention relates to the technical field of vacuum coating, in particular to a vacuum coating machine capable of improving coating purity, which comprises a bearing frame and a coating cavity mounted in the bearing frame, and the coating cavity is of an inverted conical structure; a rotary driving rod is mounted in the middle of the upper part of the coating cavity in a penetrating manner, and a non-contact transmission assembly is mounted above a main mounting rod, so that friction caused by contact is avoided; the interior of the lower portion of the bearing frame is connected with the evaporation source carrying table through a rotary lifting control mechanism. According to the vacuum coating machine capable of improving the coating purity, the cleanliness of a coating area can be improved through the non-contact transmission assembly, so that the coating purity and the product performance can be further improved, airflow generated by pressure difference can be reduced through the arrangement of the hollow interlayer groove, and the situation that the purity and the adhesive force of a formed film are affected due to the fact that tiny dust particles are raised is avoided; therefore, the cleanliness of the coating area can be further improved, and the coating purity is further improved.

The invention relates to the technical field of wire and cable extrusion processing, and discloses a cable multi-layer extrusion processing device which comprises a first extrusion component, a cooling component and a second extrusion component which are sequentially arranged in the first direction, and a to-be-processed cable sequentially penetrates through the first extrusion component, the cooling component and the second extrusion component. Wherein the cooling assembly comprises a liquid storage tank and an aeration mechanism, the liquid storage tank is used for storing cooling water, and the cable to be processed is immersed in the cooling water when penetrating through the liquid storage tank; the output end of the aeration mechanism is arranged on the inner side of the bottom wall of the liquid storage tank, and a plurality of aeration holes facing the cable to be processed are formed in the aeration mechanism. According to the cable multi-layer extrusion molding processing equipment, extrusion molding materials on the surfaces of electric wires and cables are uniformly and rapidly cooled, the mechanical performance and the surface quality of the extrusion molding materials are prevented from being affected by internal stress, and meanwhile the adhesiveness of the extrusion molding materials during secondary extrusion molding processing is improved.

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 provides a floor brush assembly, cleaning equipment and a cleaning system, relates to the technical field of cleaning equipment, and aims to solve the problems that entanglements of a rolling brush are difficult to clean and the cleaning effect of a floor scrubber is poor in the prior art. The floor brush assembly comprises a shell, a cleaning piece and a scraping plate, and the scraping plate is provided with a scraping plate face facing the cleaning piece. A first preset included angle is formed between the connecting line of a target interference point on the scraper surface and the rotating center of the cleaning piece and the scraper surface, and the value range of the first preset included angle is 80-100 degrees; the target interference point is a point with the maximum interference magnitude between the scraper surface and the cleaning piece; the rotating center of the cleaning piece is the center of the circular face where the target interference point on the cleaning piece is located. Reasonable magnitude of interference between the scraping plate and the cleaning piece is guaranteed, the relative sealing performance between the scraping plate and the cleaning piece is guaranteed, airflow formed by rotation of the cleaning piece is weakened, the probability that the cleaning piece is wound by entanglements is reduced, the problem that the entanglements are difficult to clean is solved, and the cleaning effect of the scrubber is improved.

The utility model discloses an axial flow fan outlet airflow large corner drag reduction device, which relates to the technical field of axial flow fans, and comprises a flow guide cover, a flow guide ring and a flow dividing ring, the flow guide cover is used for being fixed in an air cap and covered above a casing, the flow guide cover is of a structure with a concave middle part, the outer edge of the flow guide cover is attached to the inner wall of the air cap, and the flow dividing ring is arranged on the flow guide cover. A flow guide channel for air flow in a main flow area of the fan outlet to flow out is formed among the flow guide cover, the air cap and the upper edge of the machine shell; the flow guide ring is used for being fixed to the upper edge of a machine shell, the outer wall of the flow guide ring is attached to the inner wall of the upper edge of the machine shell, the section of the flow guide ring is in a streamline shape with the round upper portion and the sharp lower portion, and the flow dividing ring is used for being fixed to the upper portion of the flow guide ring. A flow dividing channel allowing airflow of a near-wall-face area of the fan outlet to flow out is formed between the flow dividing ring and the flow guiding ring. The utility model further discloses an axial flow fan system which comprises the axial flow fan, an air cap and the axial flow fan outlet airflow large-rotation-angle resistance reduction device.

The utility model provides an air guide device for an air conditioner and an air conditioner indoor unit, the air guide device comprises a first plate body, and the first plate body is provided with a plurality of first air outlet holes. The multiple first air outlet holes are arranged into multiple sets, and the multiple sets of first air outlet holes are formed in the first plate body. And in every two adjacent groups of first air outlet holes, the hole diameter of one group of first air outlet holes is not equal to the hole diameter of the other group of first air outlet holes. According to the air guide device for the air conditioner and the air conditioner indoor unit, the problem that an existing air guide plate cannot meet different air blowing requirements of users can be solved, and the effect that differentiated use experience is brought to different user groups is achieved.

The invention discloses a low-wind-resistance guard plate device, an automobile exhaust system and an automobile, and relates to the field of automobiles, the low-wind-resistance guard plate device comprises a front silencer guard plate used for supporting a front silencer, an exhaust pipe guard plate used for supporting an exhaust pipe and a rear silencer guard plate used for supporting a rear silencer, the front section of the front silencer guard plate is provided with a front silencer windward side, and the rear section of the front silencer guard plate is provided with a rear silencer windward side; the front section of the rear silencing guard plate is provided with a rear silencing windward side, and the front silencing windward side and the rear silencing windward side are matched with the airflow streamline. According to the invention, airflow in the area near the vehicle bottom exhaust system can be controlled, and the purpose of reducing wind resistance is achieved.

The invention relates to the technical field of ice making equipment, in particular to a revolving door for snowflake ice equipment. The snowflake ice maker comprises a snowflake ice maker body, the snowflake ice maker body is provided with a discharging port and a collecting barrel for storing snowflake ice, the snowflake ice maker body is provided with a bin door cover plate and a bottom box, the bottom box is rotationally provided with a material receiving rotating disc, the material receiving rotating disc is provided with a semi-arc bin door, and the semi-arc bin door is used for blocking the discharging port. The semi-arc bin gate is arranged to quickly block the discharge port, so that the ice making process is not influenced by the external environment, the ice making effect is achieved, and the snow ice quality is ensured.

The utility model relates to the technical field of pipeline fittings, and discloses an anti-cavitation pressure reducing valve, which comprises a valve body, a valve rod, an O-shaped ring, a sealing ring, a valve disc, a spring, a diaphragm, a valve cover and an exhaust valve, and is characterized in that a valve seat is arranged on the valve body, the valve rod is arranged in the valve seat, the sealing ring is arranged on the valve seat, and the valve disc is arranged on the sealing ring. According to the anti-cavitation pressure reducing valve, the anti-cavitation pressure reducing valve comprises a valve body, a valve rod, an O-shaped ring, a sealing ring, a valve disc, a spring, a diaphragm, a valve cover and an exhaust valve, a valve seat is arranged on the valve body, meanwhile, a valve clack of the valve seat is designed in a cage winding mode, the cage winding type valve clack can reduce the corresponding flow speed of fluid in the using process, and therefore the valve body is protected against cavitation. The air flow caused by the reduction of the flow speed is reduced at the same time, cavitation can be well avoided, the service life of the valve body, the valve seat and the valve rod is greatly prolonged, manual exhaust operation can be carried out on the upper side of the valve cover, and the noise and vibration phenomena in the using process are reduced.

The invention relates to a solar radiation shielding device for measuring photochemical mineralization of litters, and aims to solve the technical problem that the existing device cannot effectively and accurately measure the photochemical mineralization, the technical scheme is as follows: a litter bag is of a sealing bag structure, the sealing bag is made of a polyethylene film, and the inner side surface of the sealing bag is sleeved with a layer of light filtering film; the light-transmitting type and the light-shading type are selected and used according to test requirements; the supporting device comprises an upper iron gauze and a lower iron gauze which are connected through hinges on one side and provided with connecting rods on the bottom face. The fixing device is of a regular rectangular pyramid structure, and a buckle is arranged on the side face and matched with the connecting rod in position. The rain shelter comprises a support, a flashing board fixing frame and a flashing board, the support is hinged to the fixing frame, the flashing board fixing frame is of a guide groove structure, and the flashing board is an acrylic board inserted into a guide groove. The influence of microbial decomposition on the test can be avoided, confusion of thermal decomposition and photodegradation effects is avoided, and the filter film is convenient to replace.

This utility model relates to the field of wheat processing technology and discloses a high-efficiency wheat washing and screening device, including a casing. An impurity discharge hole is provided on one side of the casing. A third fixing plate is fixedly connected to the upper outer side of the casing. A screening mechanism is provided on the top of the third fixing plate. An air duct box is provided on the side of the casing away from the impurity discharge hole. A first optical axis is provided inside the air duct box. An isolation plate is rotatably connected to the outer wall of the first optical axis. A second optical axis is rotatably connected to the side of the isolation plate away from the air duct box. An adjusting strip is rotatably connected to the outer wall of the second optical axis. In this utility model, airflow is generated by a blower mechanism and transported into the casing through the air duct box. The adjusting strip allows for upward adjustment, thus solving the problems of poor purification effect and increased raw material loss in traditional wheat washing and screening devices.

The humidifying structure, the humidifying filter element and the humidifier provided by the embodiments of the present application relate to the technical field of humidifiers, and the humidifying structure comprises: a hydrophilic layer made of a hydrophilic material; a hydrophobic layer arranged on one side of the hydrophilic layer; and a filter layer arranged on the side of the hydrophobic layer away from the hydrophilic layer. In the embodiments of the present application, the filter layer is arranged on the side of the windward surface of the hydrophilic layer. During humidification, the airflow passes through the filter layer and the hydrophobic layer in sequence, and then passes through the hydrophilic layer, and the moisture in the hydrophilic layer is brought into the air to realize humidification. The filter layer can filter dust particles in the airflow, and can reduce the situation that the dust particles in the airflow directly contact the hydrophilic layer, thereby reducing the probability that the dust particles in the airflow pollute the water quality of the humidification. Meanwhile, the filter layer and the humidifying layer are arranged with the hydrophobic layer, the hydrophobic layer can play a role of physical separation, and can reduce the flow of water in the hydrophilic layer to the filter layer, thereby helping to ensure the filtering performance of the filter layer and the passing performance of the airflow.

The utility model discloses a transfer device which comprises a box body, a containing cavity is formed in the box body, the box body is provided with a gas inlet pipeline, the gas inlet pipeline comprises a gas inlet, a gas inlet passage and a gas outlet, the gas inlet passage is communicated with the gas inlet and the gas outlet, the gas inlet is used for being communicated with storage equipment to be filled with gas, and the gas outlet is used for being communicated with the storage equipment. The air inlet outlet is communicated with the air inlet passage and the accommodating cavity; the number of the air inlet outlets is larger than that of the air inlet inlets. The transfer device meets the vacuum and low-humidity environment, the air flow during inflation can be reduced, and the to-be-transferred object is not prone to being damaged.

The utility model belongs to the technical field of alarm device, disclose a kind of early warning device, the early warning device includes export piece and early warning mechanism, export piece inner wall is fixedly connected with fan, early warning mechanism includes early warning prompt subassembly and early warning trigger subassembly, early warning prompt subassembly includes heat pipe and connector, heat pipe is installed in export piece far from the one end of fan, connector is set on heat pipe, connector inside is equipped with plugging block, plugging block has solidification state and melting state, plugging block is in solidification state, plugging block can block connector to make connector and heat pipe disconnect;Plugging block is in melting state, plugging block can be separated from connector to make connector and heat pipe communicate;Early warning trigger subassembly can selectively communicate or disconnect with heat pipe, early warning trigger subassembly disconnects with heat pipe, and early warning trigger subassembly can send early warning signal.The early warning device provided by the utility model can effectively identify fire risk and improve early warning effect.

The application discloses a Dendrobium candidum multi-index nondestructive quality evaluation method, and belongs to the technical field of traditional Chinese medicinal material nondestructive detection, and particularly relates to a Dendrobium candidum multi-index nondestructive quality evaluation method. The sample is clamped in a measuring cavity, an effective measuring area between nodes is determined, and zero-perturbation pre-scanning data are obtained, based on which a micro-perturbation script is generated, near-infrared pulse irradiation, air heat exchange perturbation and mechanical light tapping perturbation are applied under a unified time axis, diffuse reflection near-infrared spectrum, a thermal recovery curve, a vibration attenuation waveform and an epidermal texture change sequence are synchronously collected, a moisture-polymer coupling state tensor is constructed, and a quality evaluation result or an abnormal label is output.

The present invention relates to the technical field of gas production equipment, and specifically to a fracturing gas production wellhead device capable of automatic detection and early warning, comprising a four-way body, and also comprising: a detection component, the detection component comprising a fixed seat installed inside the four-way body, a first pressure sensor and a flow sensor are installed on the fixed seat, and data detected by the detection component are integrated into a central control system. When an abnormality is detected, an early warning signal is triggered. Under the action of a blocking mechanism, the cleaning speed of a scraper on a filter is greatly reduced, thereby extending the service life of the scraper. At the same time, part of the power consumed by the cleaning mechanism will be converted into air pressure for storage. When natural gas leaks in normal working conditions and is detected by the detection component, the blocking mechanism blocks the filter, greatly reducing the leakage. Even if leakage occurs when no gas is produced, this part of the stored power is released and can still block the filter.

The present invention proposes a diamond material distribution device and a material distribution method. The diamond material distribution device comprises a material containing structure, a material suction structure, a material suction structure driving mechanism and a material transfer structure; the material suction structure driving mechanism comprises a first frame (614), a first guide rail (615) fixedly mounted on the first frame (614), a support platform (616) slidably mounted on the first guide rail (615), and a first linear driving mechanism (618) mounted on the first frame (614) and used to drive the support platform (616) to slide on the first guide rail (615); the material transfer structure is mounted on the support platform (616); and the material suction structure is mounted on the material transfer structure. The diamond material distribution device and the material distribution method of the present invention realize uniform distribution of diamond particles; reduce the airflow generated during the distribution of diamond particles, and can improve the quality of the finished diamond saw blade.

The invention discloses a ceramsite concrete block pouring device, which relates to the technical field of building material production, and comprises a base and a pouring mechanism, the upper end of the base is symmetrically and fixedly connected with two electric sliding rails, and the side walls of the two electric sliding rails are jointly and slidably connected with a portal frame. The pouring mechanism comprises a distribution pipe fixedly connected to the upper end of the portal frame, the lower end of the distribution pipe penetrates through the top in the portal frame and is fixedly connected with a pouring head, a plurality of pouring openings are formed in the bottom in the pouring head, the inner wall of each pouring opening is rotationally connected with a valve plate through a pin shaft, and the other end of each valve plate is rotationally connected with a flow guide plate through a pin shaft. The lower end of the pouring head is fixedly connected with multiple vertical frames. According to the invention, by dispersing multi-strand instantaneous material distribution, a traditional centralized accumulation material distribution mode is changed, so that the aggregate distribution in the formed building block is extremely uniform and has no density gradient, and the consistency of mechanical properties and the stability of thermal insulation performance of a product are improved.

The utility model relates to the field of noise detection and monitoring, in particular to urban noise sensing equipment carried by an unmanned aerial vehicle, which comprises a noise detection sensor, an upper support frame is sleeved on the outer side of the noise detection sensor, and a wind sound weakening mechanism is arranged below the upper support frame. The wind sound weakening mechanism comprises two groups of weakening plates arranged below the upper supporting frame, guide grooves are formed in one sides of the weakening plates, a plurality of groups of air inlet columns are fixedly connected to the top ends of the weakening plates, air inlet holes are formed in the bottom ends of the air inlet columns, air outlet columns are fixedly connected to the top ends of the air inlet columns, and air outlet holes are formed in the air outlet columns; the diameter of the air outlet hole is larger than that of the air inlet hole. After wind on the front side and the rear side of the unmanned aerial vehicle encounters the weakening plates, the wind direction is changed through the guide grooves so as to reduce stress of the upper supporting frame, airflow enters from the air inlet holes and then is exhausted through the air outlet holes, air pressure is reduced through the diameter difference between the air inlet holes and the air outlet holes, then resonance strength is reduced, and therefore the influence of the airflow on noise collection is reduced.

A fume hood with an air supply structure includes a test support platform and a cabinet cavity arranged above the support platform, and is characterized in that it also includes a lower air supply device, the lower air supply device includes an air passageway that can circulate supply air, and the air outlet of the air passageway is arranged to extend along the edge direction x of the support platform. The air passageway is used to supply air from the outside of the cabinet cavity to the nearby area on the surface of the support platform. The lower air supply device also includes an upper shell that forms a part of the channel wall of the air passageway and is located above the air passageway. On the flow path of the supply air, the upper shell includes a first shell portion, an intermediate transition shell portion and a second shell portion arranged in sequence, so that the air passageway is also correspondingly divided into a first section, an intermediate section and a second section corresponding to the first shell portion, the intermediate transition shell portion and the second shell portion and connected, wherein external air enters from the first section, flows through the intermediate section and then flows out from the second section.

The utility model discloses a novel negative pressure formation air extractor for a power battery, which comprises a negative pressure source gas-liquid separator, an air extraction pipe, a liquid receiving cup and a throttling piece, and the gas-liquid separator is connected with a liquid injection hole communicated with a battery formation cabinet through a connecting pipe; the exhaust pipe is connected between the negative pressure source and a gas outlet of the gas-liquid separator; the liquid receiving cup is connected with a liquid outlet of the gas-liquid separator; the throttling piece is embedded in the channel of the exhaust pipe, and a flow passing channel which is through up and down is formed in the throttling piece. The utility model relates to a novel negative pressure formation air extractor for a power battery, which can reduce the loss of electrolyte of the power battery caused by air extraction during formation, thereby improving the interface and film forming effect after formation.

The present invention relates to the field of reduction furnace safety control technology, specifically to a hydrogen reduction furnace safety control system and control method, including a reduction furnace; a barrier protection mechanism for forming a high-speed airflow protection barrier; a feed protection mechanism for protecting the feed of raw materials; and a waste gas treatment mechanism for treating waste gas; the barrier protection mechanism is connected above the reduction furnace, the feed protection mechanism is connected above the barrier protection mechanism, and the waste gas treatment mechanism is arranged on the barrier protection mechanism and the feed protection mechanism. The protective tank and the high-speed protective gas airflow formed at the top and bottom of the protective tank can form a gas barrier, thereby isolating the hydrogen to prevent the hydrogen from drifting upward and diffusing into the air during feeding to create safety hazards. At the same time, the protective gas can be discharged from the feed pipe to the outside during the feeding process, generating a continuous outward airflow to reduce or prevent air from entering with the raw materials, thereby improving the safety performance of the reduction furnace.

The utility model relates to the technical field of cleaning when an electron accelerator is used, in particular to a titanium film cleaning device of an electron accelerator, which comprises a cross beam groove assembly, a vertical frame, an air injection assembly and a liquid injection assembly. According to the titanium film cleaning device, the cross beam groove assembly and the vertical frame are designed, so that the air injection assembly and the liquid injection assembly can be fixedly installed on the titanium window conveniently, and the air injection assembly and the liquid injection assembly are controlled to work cooperatively during radiation operation, so that a titanium film installed on the titanium window is cleaned, and the titanium film can be effectively protected.

The utility model provides a multi-gear handheld spray gun which comprises a shell, a water pipe, a nozzle and a water valve, is used for spraying steam generated by a steam cleaning machine, and further comprises a pressing switch mechanism and a sliding gear switching mechanism. The pressing switch mechanism comprises a key, and the key is used for pressing the water valve to open the multi-gear handheld spray gun; the sliding gear switching mechanism comprises a sliding button and a sliding groove formed in the shell, the sliding button slides in the sliding groove and is fixed to the preset gear position, the sliding button comprises a plurality of limiting stop blocks with different heights, and when the sliding button is located at the different preset gear positions, the key is aligned to the different limiting stop blocks. The limiting stop block is used for limiting the stroke of the key so as to adjust the maximum air flow of the multi-gear handheld spray gun. According to the multi-gear handheld spray gun, a switch for spraying steam can be directly controlled, the air flow of the steam can be accurately controlled, and the multi-gear handheld spray gun is convenient and simple to operate.

The utility model relates to the field of windproof jackets, in particular to a windproof jacket which comprises a jacket body, a jacket zipper is arranged on the jacket body, pockets are arranged on the jacket body and located at the bottoms of the two sides of the jacket zipper, and pocket zippers are arranged at openings of the pockets. A left blocking piece and a right blocking piece are fixed to the jacket body, the upper portion of the right blocking piece vertically extends upwards and is fixed to the right side of the jacket zipper, the upper portion of the right blocking piece extends leftwards and is arranged on the jacket zipper in a covering mode, and the lower portion of the right blocking piece and the left blocking piece are arranged in an inclined mode towards the two sides. The tail end of the left blocking piece and the tail end of the right blocking piece extend to the position above the pocket zipper, magnetic attraction connecting pieces are arranged among the left blocking piece, the right blocking piece and the jacket body, the upper portion of the right blocking piece covers the jacket zipper, a gap in the upper portion of the jacket zipper is shielded, and wind is prevented from entering the jacket from the gap in the upper portion of the jacket zipper. And a good windproof effect is achieved on the whole wearer.

The present invention discloses a multi-degree-of-freedom automobile active aerodynamics kit, including a multi-degree-of-freedom active rear wing, an active diffuser and an active front lip. The multi-degree-of-freedom active automobile rear wing is fixed on the trunk cover of a motor vehicle. The multi-degree-of-freedom active automobile rear wing includes a rear wing bottom plate, a rear wing main plate, an electric push rod and a slider. The rear wing bottom plate is used to be fixedly connected to the trunk cover of the motor vehicle. One end of the electric push rod is fixed to the rear wing bottom plate, and the other end is hinged to the slider. The slider is connected to the rear wing main plate. Compared with the prior art, by adding a multi-degree-of-freedom active rear wing, the rear wing can be raised, lowered and tilted according to different vehicle speeds and driving modes to meet the aerodynamic needs in various states, ensure the stability of the vehicle during driving, reduce the wind resistance coefficient during normal driving, and improve the cornering performance of the vehicle under high-speed driving.

The utility model discloses a box body structure of a heat storage box, which belongs to the technical field of heat storage boxes and comprises a heat storage box body, a first flue gas inlet pipe is arranged at the bottom of the heat storage box body, a second flue gas inlet pipe is arranged on the upper portion of the heat storage box body, a low-temperature cavity and a high-temperature cavity are arranged in the heat storage box body, and a plurality of supporting legs are arranged at the bottom of the heat storage box body. A supporting net plate is arranged on the supporting legs, a plurality of low-temperature heat storage assemblies are arranged on the supporting net plate and located in the low-temperature cavity, and a plurality of sets of high-temperature heat storage assemblies are arranged above the low-temperature heat storage assemblies and located in the high-temperature cavity. The heat storage efficiency can be prevented from being affected by part of accumulated dust generated in the heat storage process of smoke through the heat storage box, and the heat storage efficiency of the heat storage box is improved.

This utility model provides an indoor unit for an air conditioner with dual-sided air outlets, including a housing with a first air outlet and a second air outlet. A main air duct section is disposed within the housing, along with a first air duct section and a second air duct section connecting to it. The first air duct section is connected to the first air outlet, and the second air duct section is connected to the second air outlet. The main air duct section includes a first air duct wall and a second air duct wall. A cross-section at the front end of the first air duct wall is a first reference surface, and a cross-section at the front end of the second air duct wall is a second reference surface. The plane of symmetry between the first and second reference surfaces is a third reference surface. The first air duct section includes a fourth air duct wall. The second air duct section includes a sixth air duct wall. A reference line is provided at the connection between the sixth air duct wall and the fourth air duct wall, and the cross-section at the reference line is perpendicular to the third reference surface. This design helps to improve the uneven airflow between the first and second air outlets.