39results about How to "Improve total pressure efficiency" patented technology

The invention discloses an unpowered draught fan with support frames as wing-shaped blades. According to an existing unpowered draught fan, strong vortexes will be formed behind plate support frames, and the turbulence degree of a flow field is intensified. The lower-end support frame of the unpowered draught fan is formed by multiple lower-end wing-shaped blades, one end of each lower-end wing-shaped blade is fixed to the bottom of a center shaft, and the other end of each lower-end wing-shaped blade is fixed to the inner wall of an angle-changing pipe diameter; the upper-end support frame of the unpowered draught fan is formed by multiple upper-end wing-shaped blades, one end of each upper-end wing-shaped blade is fixed to a positioning sleeve, and the other end of each upper-end wing-shaped blade is fixed to the inner wall of a cylinder pipe diameter; the positioning sleeve is supported to the center shaft through a bearing; the chord length of the upper-end wing-shaped blades is larger than the chord length of the lower-end wing-shaped blades; the bottoms of the multiple air cutting blades are welded to the end face of the top of the cylinder pipe diameter, and the tops of the multiple air cutting blades and a turbine top plate are welded; and the top of the center shaft is supported into a bearing hole formed in the turbine top plate through a bearing. By means of the unpowered draught fan, flow disturbance of the flow field in the draught fan is improved, vibration of complex turbulence conditions on the draught fan is weakened, and the service life of the draught fan is prolonged.

The invention discloses a cyclone air-inlet centrifugal synchronous backward flow fan comprising a casing, an air inlet of the casing, an air outlet of the casing, an impeller, a vane disk of the impeller, a vane of the impeller, an axial inlet of the vane of the impeller, an inlet of the air inlet of the casing and an outlet of the air inlet of the casing. The cyclone air-inlet centrifugal synchronous backward flow fan is characterized in that a cyclone inducer is arranged in the air inlet of the casing and comprises a baffling connector and a baffling vane, the baffling connector penetrates through the middle of the cyclone inducer longitudinally along an axial direction from the front to the back, the baffling vane is in the form of a bending structure, the front end of the radial direction of the baffling vane is connected with the baffling connector, the back end of the radial direction of the baffling vane is connected with the side wall of the air inlet of the casing, an inlet of the baffling vane at the front end of the axial direction of the baffling vane points to the inlet of the air inlet of the casing along an axial direction, and an outlet of the baffling vane at the back end of the axial direction of the baffling vane points to the axial inlet of the vane of the impeller slantways along a circumferential direction. In the cyclone air-inlet centrifugal synchronous backward flow fan disclosed by the invention, a cyclone air-inlet principle is adopted, the air-inlet effect of the fan is greatly improved, the flow rate of the fan is increased, the total-pressure efficiency is enhanced, energy resources are saved, and noise is lowered.

The invention discloses a swirling air intake centrifugal fan, which comprises a casing, a casing air intake, a casing air outlet, an impeller, an impeller disc, impeller vanes, an impeller vane axial inlet, a casing air intake inlet, and a casing air intake outlet. The fan is characterized in that: a swirling induction unit is arranged in the casing air intake, and is formed by baffling blades; radial front ends of the baffling blades are connected one another, and radial tail ends of the baffling blades are connected with the lateral wall of the casing air intake respectively; the baffling blades are circumferentially inclined from front to back along the axial direction; and baffling blade inlets at axial front ends of the baffling blades are inclined circumferentially to direct at theimpeller blade axial inlets. By adopting a swirling air intake principle, the air intake effect of the fan is greatly improved, the fan flow rate is increased, the total pressure efficiency is improved, energy is saved, and noise is reduced.

The invention discloses a deep trench filling method, in which deep grooves are filled with epitaxial layers until the epitaxial layers on the side walls of the trenches gather up at the bottom portions, and non-conductive mediums are used to fill the residual gaps in the trenches until the trenches are full. According to the deep trench filling method of the invention, the epitaxial filling is stopped after the bottom portions of the epitaxial layers gather up and before the top portions of the expixial layers gather up, and the epitaxial volumes of the bottom portions and the top portions of the epitaxial layers are kept to be approximate to each other. Since the impurity levels in the filling epitaxial layers are proportional to the volumes, the filling method can reduce the difference in the amount of impurities in the bottom and upper portions of the deep trenches and improve the uniformity of depletion regions so that the differences in the depletion degrees of the trenches at different depths are slight, thereby raising the overpressure resistant efficiency of the depletion regions and improving the overpressure resistant capability of products.

A planar Schottky barrier diode comprises an N-type heavily-doped silicon substrate, an N-type light-doped epitaxial layer, a P-type heavily-doped loop region, a thin oxide layer, a field oxide layer, a Schottky barrier layer and multiple layers of metal and is characterized in that a P-type light-doped loop region is arranged in the N-type light-doped epitaxial layer outside the P-type heavily-doped loop region, the thin oxide layer is arranged on the P-type heavily-doped loop region and the P-type light-doped loop region, the field oxide layer is arranged on a part of the P-type light-doped loop region and on a part of the N-type light-doped epitaxial layer outside the P-type light-doped loop region, and the Schottky barrier layer is formed on a part of the P-type heavily-doped loop region and on a part of the N-type light-doped epitaxial layer. With the diode disclosed by the invention, the pressure resistant efficiency of the P-type heavily-doped loop region can be effectively improved, the surface field of a Schottkey barrier region can be further enhanced by reducing the junction depth of the P-type heavily-doped loop region, so that the lightning resistance ability of the planar Schottkey barrier is improved, the positive conducted voltage drop can be reduced, and the positive surge capability is improved.

The invention relates to the technical field of axial flow fans, in particular to a large axial flow impeller with toothed leading edge blades, including a hub and blades, characterized in that the windward side of the blade is serrated, and the windward The angles are arranged in sequence along the windward straight edge of the blade. The guide angle of attack is an isosceles triangle. The direction of the bias flow under action is corresponding, and the present invention has the advantages of novel structure, small resistance, low noise, high total pressure efficiency, and excellent aerodynamic performance due to the adoption of the above structure.

The invention discloses a reversible axial flow fan blade with air blowing grooves. The reversible axial flow fan blade with the air blowing grooves comprises a blade body which is composed of a blade handle and a blade body part, wherein the at least two air blowing grooves are formed in the top of the blade body part in the circumferential direction and are evenly distributed on the surface of the top of the blade, and a wing type pressure surface of the top of the blade and a suction surface are communicated through the air blowing grooves. According to the symmetrical grooves, airflow flowing from the pressure surface to the suction surface is formed in the grooves by means of the high pressure difference between the pressure surface and the suction surface, and vortexes on the suction surface are blown away in the flowing direction. According to the reversible axial flow fan blade with the air blowing grooves, the grooves are formed in the top of the blade body part, in this way, the vortex structure of the suction force on the top of the blade can be maintained, the flowing intensity of loop flow on an inlet and the flowing intensity of the axial vortexes of the suction surface of the top of the blade are reduced, vortex loss and the friction loss are reduced, the total-pressure efficiency of a fan is improved, energy is saved, and consumption is reduced. It is proved through computer numerical values that the total-pressure efficiency of the reversible axial flow fan can be improved by 3%-5%, and the manufacturing cost is reduced by about 10%.

The invention discloses a non-powered fan whose support frame is an airfoil blade. The existing unpowered fan will form a strong eddy current behind the plate support frame, which intensifies the degree of turbulence in the flow field. The lower end support frame of the present invention is a plurality of lower end airfoil blades, one end of the lower end airfoil blade is fixed on the bottom of the central shaft, and the other end is fixed on the inner wall of the variable angle pipe diameter; the upper end support frame is a plurality of upper end airfoil blades, and the upper end airfoil One end of the blade is fixed on the positioning sleeve, and the other end is fixed on the inner wall of the cylindrical pipe diameter; the positioning sleeve is supported on the central shaft through bearings; the chord length of the upper airfoil blade is greater than the chord length of the lower airfoil blade; The bottom is welded to the top end surface of the cylindrical pipe diameter, and the top is welded to the top plate of the turbine; the top of the central shaft is supported in the support hole opened by the top plate of the turbine through bearings. The invention improves the flow disturbance of the internal flow field of the fan, weakens the vibration caused by the complicated turbulent flow condition to the fan, and prolongs the service life of the fan.

The invention discloses a method for generating a volute profile line, comprising the following steps: 1) determining at least three positioning points with characteristic meanings in the center of the circle, the characteristic meanings being the positioning of the volute tongue, the height of the volute or the width of the volute; 2) With the center of the circle as the origin, according to the coordinates of each positioning point, the volute is determined by curve fitting; 3) After each positioning point is determined, the coefficient m of the Archimedes or logarithmic spiral is deduced in reverse, and then Use the smooth curve to pass through the corresponding m value of each anchor point, fit the curve diagram about m, wherein it is the angle formed by this point and the initial radial section of the volute; 4) then pass through Archimedes or pair Counting helix formula:, calculate the value under different values, and get the corresponding corrected volute shape line. Also disclosed are the volute produced according to the above method, a fan system using the above volute, and a range hood using the above fan system.

The invention discloses a centrifugal compressor model stage. my country's centrifugal compressor technology still needs to be continuously improved, so as to enhance the stability of compressor operation and improve the efficiency of compressor operation. The present invention comprises impeller, vane diffuser, bend and reflux device; vane diffuser is arranged at the outlet of impeller; The side of the wheel cover is bent to form an outlet stabilizing plate; the outlet of the vane diffuser communicates with the bend; the outer wall of the bend is provided with an annular groove; There is a drag reducing groove, and the reflux blade has a rectangular groove at the outlet of the blade. The present invention improves the diffuser, bend and reflux structure of the existing centrifugal compressor model stage to ensure that the operating efficiency of the centrifugal compressor model stage is improved and the stability of operation is enhanced; the energy gradient function in the diffuser is proposed The formula for calculating the value.

The invention relates to a high-head small-flow forward multi-wing centrifugal blower, which is formed by integrally casting and has a low-noise characteristic. The forward multi-wing centrifugal blower comprises a scroll casing, an impeller and a current collector, wherein the impeller is arranged in the scroll casing; and the current collector is arranged at the air inlet of the scroll casing. The forward multi-wing centrifugal blower is characterized in that: the impeller and the scroll casing are cast integrally; the impeller is a forward multi-wing narrow-cavity impeller; and the scroll casing is an indent narrow-cavity scroll casing. The forward multi-wing centrifugal blower has the advantages of high aerodynamic performance, low noise, light weight and high structural strength; and a gap between the impeller and the scroll casing is reduced by adopting a narrow-cavity indent structure, and vortex caused by backflow between the impeller and the scroll casing can be effectively reduced, so that the airflow vortex noise in a cavity is lowered. Compared with a large quantity of low-noise centrifugal ventilation fans with the same air performance, the low-noise forward multi-wing centrifugal blower has the advantages that: he total pressure efficiency is increased by 7 percent, the air noise is lowered by over 5 dB(A), and the vibration acceleration level elastic installation condition of a fan chassis can be less than or equal to 115 dB, which is far less than those of products of the same type.

The invention relates to a dynamic prewhirl and axial push type hydrocyclone which is composed of a medium prewhirl part and a hydrocyclone separating part. The invention is characterized in that materials are fed along the axial direction, a turnstile is used for prewhirl, the axial dimension of the turnstile is short and is not easy to vibrate; and the turnstile also has the function of boosting pressure, the pressure drop of the hydrocyclone is very low; a ring-shaped material axial propelling and accelerating structure is arranged in the outer ring area of the end part of the turnstile sothat the axial flow on the periphery of the hydrocyclone is increased, the heavy component on the border can faster reach a heavy liquid outlet, the treatment capacity is increased, the outflow of the unseparated inner medium is reduced, and the axial velocity gradient between layers is reduced, thus avoiding entrainment and blending. A short-circuit-proof baffle cap is arranged at the outlet of light liquid which flows backward so that the feed mixed medium is prevented from flowing to the outlet of light liquid, namely short circuit outflow while the separating efficiency is increased. The invention is applicable to the efficient separation of liquid-solid two-phase with solid particles or oil-water two-phase with solid particles.

The invention discloses an axial flow type fire-fighting smoke exhaust fan. The axial flow type fire-fighting smoke exhaust fan comprises an enclosure and an impeller, wherein the diameter of the impeller is D and the diameter of a motor barrel is d; the enclosure is internally provided with a rectification cover and a rectification body; the rectification cover is fixed at the front end of the impeller; the rectification body is fixed at the rear end of the motor barrel; the rectification cover is semi-spherical, the radius (R) is equal to 0.25-0.35D and the length (L) is equal to 0.1-0.15D; the rectification body is in a butt conical shape and is gradually reduced along the direction of an air outlet; the conical half angle (alpha) is equal to 18-25 degree and the length (L1) is equal to 0.58-0.7d; the end part of the rectification body is in a circular arc shape; the central lines of the rectification cover and the rectification body are overlapped with the axis of the enclosure. According to the axial flow type fire-fighting smoke exhaust fan, the rectification cover and the rectification body are arranged at an air inlet and the air outlet in the enclosure so that the air inlet condition is more complete and the noises of the draught fan are reduced; an airflow channel of the inlet of the axial flow type fire-fighting smoke exhaust fan is formed by the rectification cover mounted in front of the impeller; by the aid of the rectification cover, the flow of the draught fan can be improved by about 10%.

The invention discloses a double-suction type centrifugal ventilation fan. Centrifugal fan technologies in China still need to continue to improve, so as to enhance the stability of operation of fans, increase the efficiency of operation of the fans and lower the power consumption of the fans. According to the double-suction type centrifugal ventilation fan, a flow baffle is arranged at an outlet of a volute; two blade groups are symmetrically arranged at the two sides of a wheel disc; each blade group comprises a plurality of long blades and short blades; the long blades are uniformly distributed along the circumference, and a short blade is arranged between every two adjacent long blades; the inner end faces of the long and short blades are all welded to the wheel disc, and the outer end faces of the long and short blades are all welded to the inner ends of two wheel covers; the outer end of each of the two wheel covers is welded to a forward guider; bladeless pressure expanding edges are arranged at the edges of ends, welded to the long and short blades, of the wheel covers; the rim of the wheel disc is a spherical surface; a plurality of resistance reduction grooves which are equidistantly arranged along the axial direction of the wheel disc are formed in the internal sidewall of the volute. The double-suction type centrifugal ventilation fan has the advantages that the static pressure-flow characteristic and efficiency-flow characteristic of the existing double-suction type centrifugal ventilation fans can be improved, and thus, the pneumatic performance of the existing double-suction type centrifugal ventilation fans is improved.