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

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 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 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.