22results about How to "Reduce flow loss" patented technology

This invention provides a pump body assembly for a compressor and a compressor. The pump body assembly includes: a first cylinder with a suction channel, comprising a main channel and a branch channel, the axis of the main channel being inclined relative to the axis of the compressor; a connecting channel on a partition member, the axis of the connecting channel being inclined relative to the axis of the compressor; and an intake channel on a second cylinder, the axis of the intake channel being inclined relative to the axis of the compressor. The main channel, the connecting channel, and the intake channel are sequentially connected. The intake end of the main channel is located on the side of the first cylinder and / or on the end face of the first cylinder facing away from the partition member. The intake channel communicates with the chamber of the second cylinder, and the branch channel connects the main channel and the chamber of the first cylinder. The technical solution of this invention solves the problem of high suction resistance in the second cylinder of the compressor in the prior art, which leads to reduced overall energy efficiency.

The application belongs to the technical field of combustion engines, and provides a large-size side exhaust pipe of a turboshaft engine, which comprises: a pipe body having an inlet end and an outlet end; an outlet reinforcing structure arranged at the outlet end region of the pipe body; a support structure arranged inside the pipe body; an anti-abrasion connecting structure arranged at the inlet end of the pipe body; and an internal flow passage of the pipe body is configured to guide the gas input from the inlet end to be discharged laterally at the outlet end, the internal flow passage of the pipe body has a preset expansion cone angle θ2, the flow passage center line of the pipe body is a three-dimensional space curve constructed based on a non-uniform rational B-spline curve, and the ratio of the outer diameter size of the inlet end to the center transverse distance between the inlet end and the outlet end satisfies a preset condition. The core aerodynamic problem of "complex internal flow field organization of a large-size side exhaust pipe, non-uniform outlet flow field and small effective aerodynamic area" in the prior art is solved, and the limit performance of the exhaust pipe is excavated without affecting the performance of the engine.

The application relates to the technical field of kitchen appliances, and discloses a range hood. The range hood comprises a fan assembly and a pipeline assembly, the fan assembly comprises a machine box and a fan which is obliquely arranged in the machine box, an air inlet of the machine box is arranged on the machine box, the pipeline assembly is connected with the machine box, an inner cavity of the pipeline assembly is communicated with the air inlet of the machine box, and a noise reduction outward expansion structure close to a wall and a flow guide outward expansion structure away from the wall are arranged at the connection position of the pipeline assembly and the machine box. Since the fan is obliquely arranged at a certain angle, the wide flow channel side area of the fan air inlet is farther away from the air inlet of the machine box, the airflow of the fan air inlet is beneficially flowed, the noise reflected by the noise reduction outward expansion structure has a certain phase angle with the noise direction of the fan, thereby canceling part of the noise energy, the outward expansion direction of the flow guide outward expansion structure is towards the kitchen internal space, the airflow turning angle is increased, the flow loss is reduced, the tail edge separation vortex is weakened, the effective flow area is increased, and the performance of the fan can be further improved.

The application relates to the technical field of kitchen appliances, and discloses a range hood. The range hood comprises a fan assembly and a pipeline assembly, the fan assembly comprises a machine box and a fan arranged in the machine box, an air inlet of the machine box is arranged on the machine box, the pipeline assembly is connected with the machine box, an inner cavity of the pipeline assembly is communicated with the air inlet of the machine box, a flow guide outer expansion structure is arranged at the connecting position of the pipeline assembly and the machine box, the area of the flow guide outer expansion structure is adjustable, and the angle of the flow guide outer expansion structure relative to a horizontal plane is adjustable. The range hood provided by the application has the advantages that the airflow turning angle is large, the flow loss is reduced, the tail edge separation vortex is weakened, the effective flow area is increased, the performance of the fan can be further improved, the flow guide outer expansion structure can be adjusted according to different airflow flow states, the flow guide outer expansion structure is matched with the performance of the fan, the performance of the fan is maximally exerted, and the adaptability to the flow working condition is further improved.

The present application relates to a kind of vane and impeller with the vane, vane includes vane body, the front end of the vane body is vane leading edge, rear end is vane trailing edge;The thickness of the vane body is gradually increased thick gradually decreasing from vane leading edge to vane trailing edge, and form a smooth vane body;The maximum camber position of the cross section of the vane body is located at 25%-75% of vane chord length.The vane of the present application can effectively save material and reduce noise by changing the maximum camber position of vane cross section and using front bending and rear sweep form.

The application relates to the technical field of aero-engines, and provides a main combustion stage mixing pipe of a center staged combustion chamber, the center staged combustion chamber and an aero-engine. The main combustion stage mixing pipe of the center staged combustion chamber comprises a mixing pipe body, the first end of the mixing pipe body is a closed end, a through hole is arranged in the center of the closed end and is used for injecting fuel, and the second end of the mixing pipe body is an open end; the mixing pipe body is provided with multi-stage rotational flow hole structures, each stage of the rotational flow hole structures is communicated with the inside of the mixing pipe body, air enters the mixing pipe body through the rotational flow hole structures and is mixed with fuel to spiral flow, so that the air and the fuel are uniformly mixed. Compared with the rotational flow mixing by using blades, the rotational flow hole structures shorten the axial length of the mixing pipe body, so that the structure of the combustion chamber is more compact, the flow loss is reduced, stable combustion is realized, and the combustion demand of a new generation of aero-engines is met.

The present application relates to the technical field of a warmer, in particular to a warmer. The warmer comprises: a fan assembly, a volute outlet adapted to air outlet is arranged on the fan assembly; an air outlet unit, an annular air outlet is arranged on the air outlet unit; a flow guide outer wall adapted to communicate the volute outlet and the annular air outlet; and a flow guide inner wall, the flow guide outer wall and the flow guide inner wall are arranged at intervals, a flow guide cavity is formed between the flow guide outer wall and the flow guide inner wall, and the flow guide cavity is adapted to guide the airflow to be uniformly discharged from the volute outlet to the annular air outlet. The warmer provided by the present application forms a funnel type air guide structure by arranging the flow guide outer wall and the flow guide inner wall, so that the airflow from the fan assembly is more smoothly introduced into the air outlet unit; by arranging the flow guide grid, the airflow is more uniformly flowed to the annular air outlet direction, so that 360° full range super wide angle air supply is realized, the purpose of uniform heating is achieved, and the comfort of bathing is improved.

The application discloses a coaxial multi-atmosphere water guide laser processing device, which comprises a laser generating module, a light-water coupling module, a protective gas flow generating module and a composite nozzle assembly. The light-water coupling module couples the water jet and the laser by total reflection to form a laser water jet. The protective gas flow generating module comprises a first protective gas flow generating module and at least one second protective gas flow generating module, and can generate multiple layers of coaxial protective gas flows. The first protective gas flow spirally surrounds the outside of the laser water jet, and the second protective gas flow further surrounds the outside of the first protective gas flow. The composite nozzle assembly is composed of a first nozzle and at least one second nozzle which are coaxially nested from inside to outside. Finally, the output is a coaxial composite jet composed of the laser water jet and the multiple layers of protective gas flows. The application solves the technical problems that are difficult to simultaneously realize efficient water drainage, prevent molten material from splashing back and maintain the stability of the water jet in the prior art.

This invention discloses an engine intake mechanism, an engine system, and a vehicle, belonging to the field of engine technology. The engine intake mechanism of this invention makes the inner wall of the airflow guide passage smoother; in other words, there are no geometric abrupt changes in the inner wall of the airflow guide passage. This reduces flow losses in the airflow guide passage, resulting in smaller variations in airflow velocity. Consequently, the airflow pressure and velocity at the turbocharger inlet are more uniform, improving aerodynamic efficiency and thus increasing boost efficiency. The engine system and vehicle of this invention, by applying the aforementioned engine intake mechanism, can improve the engine system's power performance and fuel economy, and enhance the driving experience.

This invention provides a centrifugal compressor and its impeller, wherein the impeller includes a plurality of blades arranged circumferentially, with a flow channel formed between each pair of adjacent blades; each blade is backward-curved, gradually bending away from the impeller's rotation direction from its inlet end to its outlet end; and in the direction from the inlet end to the outlet end, the thickness of each blade first gradually increases and then gradually decreases. The impeller of this invention has higher aerodynamic efficiency, which is beneficial for miniaturizing the centrifugal compressor.

The utility model relates to the technical field of air conditioners, in particular to an axial flow fan which comprises an installation disc, blades, a first reinforcing part and a second reinforcing part. The blades are arranged on the peripheral wall of the mounting disc; the first reinforcing part is arranged on the suction surface of the blade and is close to the front edge side of the blade; the first reinforcing part extends to the blade top of the blade from the blade root of the blade; the second reinforcing part is arranged on the suction surface of the blade and is close to the tail edge side of the blade; the second reinforcing part extends to the blade top of the blade from the blade root of the blade; the structural strength of the blades is improved, and therefore the strength requirement of the axial flow fan is met.

The engine air inlet system comprises an air cylinder sleeve and an air inlet cavity, an air cylinder cavity is formed in the air cylinder sleeve, a plurality of air inlets arranged at intervals in the circumferential direction are formed in the circumferential wall of the air cylinder sleeve, and the air inlet directions of the multiple air inlets are obliquely arranged in the same circumferential direction of the air cylinder sleeve; the air inlet cavity surrounds the peripheries of the multiple air cylinder sleeves, the air inlet communicates with the air cylinder cavity and the air inlet cavity, at least two air inlet pipelines arranged at intervals in the circumferential direction are arranged on the circumferential wall of the air inlet cavity, and the air inlet directions of the at least two air inlet pipelines are arranged along the inner circumferential wall of the air inlet cavity. The included angle between the air inlet and the air inlet direction of the air inlet close to the inner circumferential wall of the air inlet cavity is smaller than 90 degrees. Under the condition of the same inclination angle, compared with a traditional air channel, the swirl ratio is remarkably increased, on the premise that the air inlet flow coefficient of the two-stroke engine is the same as that of an existing two-stroke engine, the swirl ratio is increased, and the problem that the swirl ratio is low under the high flow coefficient of the traditional two-stroke engine is solved.

The utility model relates to an anti-backflow moving blade and rotor for axial flow compressor, relate to axial flow compressor technical field, it includes blade body, the blade body includes opposite blade basin side and blade back side, the top of blade basin side is provided with anti-backflow edge, and the anti-backflow edge extends to the direction away from blade back side. The design of anti-backflow edge can effectively block the backflow and undercurrent along the radial motion, so as to obtain less flow loss, higher pressurization and pressurizing capacity and higher efficiency.

The invention discloses a single-stage booster fan, a multi-stage booster fan and a multi-channel booster fan, and relates to the technical field of automobile ventilation equipment, and the single-stage booster fan, the multi-stage booster fan and the multi-channel booster fan comprise a fan shell which is of a closed shell-shaped structure as a whole, an air inlet is formed in one end of the fan shell, and an air outlet is formed in the other end of the fan shell; the rotor part is rotationally installed in the fan shell, the rotor part is provided with a plurality of first axial flow fan blades which are arranged in a radial shape, and all the first axial flow fan blades synchronously rotate along with the rotor part and surround the peripheral side of the rotating axis of the rotor part; the rotor part is matched with a driving mechanism for driving the rotor part to rotate; the stator part is fixedly installed in the fan shell and coaxially arranged on the air outlet side of the rotor part, the stator part is provided with a plurality of second axial flow fan blades arranged in a radial mode, the second axial flow fan blades surround the peripheral side of the axis of the stator part, and the spiral direction of the second axial flow fan blades is opposite to the rotating direction of the first axial flow fan blades; in a limited space, the pressurization ventilation effect in a vehicle is improved.

This invention provides an impeller assembly, a centrifugal impeller, and a steam compressor. The impeller assembly includes a hub and multiple blades disposed on the hub. Multiple separation plates are disposed on the sides of the blades, and an airflow channel is formed between adjacent separation plates. The impeller assembly, centrifugal impeller, and steam compressor provided by this invention, by setting multiple separation plates on the blades and forming airflow channels, optimizes the flow characteristics of the airflow in the impeller, effectively reducing friction and flow losses caused by blade boundary layer friction and secondary flow losses, thereby improving the impeller efficiency. Simultaneously, the separation plates also strengthen the blades, enabling them to meet the requirements of a steam compressor. The weight-reducing grooves reduce the weight of the blades while maintaining their strength, thereby increasing the critical speed of the impeller, reducing energy consumption, and ultimately improving blade performance.

The application discloses a kind of high-efficiency low-noise elbow based on section shape and steering radius joint control, the inlet end surface and outlet end surface of the elbow are both elliptical structure, and the inlet elliptical section parameter is equal to its outlet elliptical section parameter;Elbow steering angle is 90°;The elliptical section eccentricity of the described is valued (0,1), and the steering radius of elbow is valued in the range of 0.5D1~2D1.Elbow design method is under the condition of keeping the cross-sectional area of elbow unchanged, by controlling the parameters when the cross section of elbow changes from circular to elliptical, i.e., the eccentricity e of cross-sectional ellipse and the steering radius R of elbow, the sound pressure intensity of flow noise obtained by simulation calculation, pressure fluctuation intensity and entropy production are joint optimization objectives, the elbow is optimized and iterated, a set of optimal high-efficiency low-noise elbow design parameters are found to realize the application requirements of less energy loss, weak pressure fluctuation intensity and low noise.

The application discloses a stove upper air inlet burner, which comprises a burner base and a fire cover, and a circular channel for gas flow is arranged on the surface of the burner base, the circular channel is formed by a left channel and a right channel, the left channel is gradually lifted in the height direction with the change of the central angle and is ended above the right air inlet hole, the right channel is gradually lifted in the height direction with the change of the central angle and is ended above the left air inlet hole, the left and right air inlet holes are respectively extended backward to connect with the injection pipe, a plurality of fire holes are arranged on the outer wall of the circular channel of the burner base, and the fire cover is matched and covered on the surface of the circular channel.

This invention provides a rotor blade profile for a liquid ring pump, the shape of which is determined by the coordinates of an involute equation, wherein the equation is: , ; where, X The x-axis is... Y The vertical axis represents the blade profile. X , Y A segment of a curve formed by continuous changes; the radius of the outer circle of the impeller hub. D The diameter of the impeller. t Let π be the independent variable and π be the value of a circle. b This is an eccentric quantity. Its range of values ​​is... D The value range is 0.2 to 0.3 times; t The value range is 0 to 1; b The value range of is 0 to 1 times the value range of . This invention has many advantages, such as good overall performance, low working loss, high working efficiency, low vibration, low noise, and low cavitation risk.

The utility model relates to the technical field of air conditioners, in particular to an axial flow fan and an air conditioner outdoor unit, and the axial flow fan comprises a mounting disc, blades and a first reinforcing part; the blades are arranged on the peripheral wall of the mounting disc; the first reinforcing parts are arranged on the pressure face of the blade and close to the front edge side of the blade, the multiple first reinforcing parts are distributed in the circumferential direction of the blade, and circumferential gaps are formed between the adjacent first reinforcing parts. The structural strength of the blades is improved, and therefore the strength requirement of the axial flow fan is met.

The application relates to the technical field of air conditioners, and discloses a centrifugal fan, a fresh air module and an air conditioner. The centrifugal fan provided by the application comprises a disc and a plurality of first fan blades, the plurality of first fan blades are arranged in a non-uniform interval on one side of the disc, and the phase angle difference values of adjacent first fan blades are in sinusoidal function distribution. The centrifugal fan, by arranging the plurality of first fan blades in a non-uniform interval on one side of the first disc, makes the air ducts formed between the first fan blades have different sizes, which not only helps to reduce the resonance of the first fan blades caused by the airflow passing through the air ducts, but also reduces the flow loss, improves the total pressure efficiency and air volume output of the centrifugal fan, and solves the problem of uneven airflow distribution during the operation of the centrifugal fan.

This invention provides a biomimetic near-space vehicle wing modification design method, comprising the following steps: obtaining the wing chamber structure on the surface of a dragonfly wing and the folded corrugated structure on the cross-section of the dragonfly wing; designing a biomimetic wing chamber structure based on the wing chamber structure on the dragonfly wing surface; smoothly connecting the extreme points of the folded corrugated structure of the dragonfly cross-section to obtain a biomimetic wing cross-sectional structure; fabricating the wing based on the biomimetic wing cross-sectional structure, and arranging the biomimetic wing chamber structure at a position before the initiation point of boundary layer transition on the wing surface. This biomimetic near-space vehicle wing modification design method, by designing a biomimetic modified wing based on the cross-sectional structure and wing chamber structure of a dragonfly wing, and by arranging a suitable dragonfly-inspired wing chamber structure on the wing, controls the initiation position of boundary layer transition on the wing surface, prompting the boundary layer to transition to a turbulent boundary layer earlier, thus making the wing surface boundary layer more stable.

The utility model discloses a kind of multi-wing centrifugal fan blade and multi-wing centrifugal fan, it includes: elliptic arc section, the elliptic arc section is located the air inlet end of the blade;Linear section, the linear section is located the air outlet end of the blade;Middle circular arc section, the circular arc section is located the intermediate position of the blade, the circular arc section is connected respectively the linear section and the elliptic arc section.The blade profile is divided into the three-section composite structure of elliptic arc section, middle circular arc section and linear section, different area characteristics of air flow in blade channel are optimized respectively.Elliptic arc section optimizes inlet region air flow angle deviation, reduces inlet impact loss;Middle circular arc section realizes air flow steady turning, reduces flow separation caused by inverse pressure gradient in blade channel;Linear section suppresses outlet cross section vortex area, reduces outlet flow loss.Three-section synergistic effect significantly reduces aerodynamic loss, improves fan system efficiency, solves the defect that single circular arc blade cannot consider inlet impact and passage separation.