The impeller of the centrifugal blower
(57) Abstract:The invention relates to mechanical engineering and can be used in a centrifugal compressor machines. The impeller of the centrifugal blower, which includes the following behind the wheel belopotosky diffuser and side team of the camera contains the covering disk, radially arranged blades, outlined by a single radius. The wheel has an axial entrance, the exit angles of the blades 30othe relative width of the output 0,055-0,065, relative input the diameter of the ends of the blades of 0.5, the slope of the covering disk 6-8oand the number of blades 10-12. Interscapular channels wheels are made with the minimum allowable by their diffusionally by providing the maximum width of these channels at the entrance to the wheel, which is achieved by using the angles of the inlet vanes equal 45o. The invention is aimed at improving the efficiency of the wheel and the compressor as a whole. 2 Il. The invention relates to mechanical engineering and can be used in a centrifugal compressor machines.Known in practice, stationary compressors, impellers have the output angles of the blades in the range2= 20-90.
Succession is patok, equal1= 29-33leads to an increase in the degree of reactivity and efficiency of impellers and stages in General up to the use of the output angles of the blades is equal to2= 30. Further reduction of output angles does not increase the efficiency of the wheel and step (C. F. Fig. Centrifugal compressor machines. Engineering, 1981, S. 161, 162).In combination with the use of blades, outlined one of radius Rloptimum relative width of the wheels IN2/D2= 0,055-0,065 (B. F. Rice, S. 151, 157), the optimal angles of the covering disk = 6-8rare grid with the number of blades of the wheel Z = 10-12 such stage when the input and output angles of the blades provide maximum efficiency blowers 0,82-0,83. Use these steps when setting vaned diffuser provides maximum polytropic efficiency 0,84 is 0.86.The disadvantage of the considered speed when using bezopalubochnogo diffuser and side camera team is the steepness of the characteristics efficiency at sufficiently high maximum values.The objective of the invention is to increase given the output angles of the blades of maximum values of efficiency gauge full implementation, provided by using belopotosky diffusers.This technical result is achieved by the fact that the impeller of the centrifugal blower, which includes the following behind the wheel belopotosky diffuser and side camera team, with the radial position of the blades, outlined by a single radius, covering the disk, the axial inlet flow angles of output blades 30othe relative width of the output 0,055-0,065, relative input diameter at the ends of the blades of 0.5, angles of inclination of the covering disk 6-8onumber of blades 10-12, interscapular channels wheels run with a minimum diffusionally by providing the maximum width of these channels n at the entrance to the wheel that is carried out by using the angles of the inputs of the blades 45o.In Fig. 1 shows a meridional cross-section of the impeller of the proposed design, and Fig.2 shows a view of the wheel And in the plane of the rotation.We offer the impeller includes blades 1, covering the disk 2, a driving disk 3.In the Fig.1 and 2 shows the input and output diameters of the blades D1and D2, wheel width at the output IN2the angle opacki and the radius centers of Rland Raboutwidth interscapular channel at the entrance to the wheel n.When the gas enters the compressor in the interscapular wheel channel formed by the blades 1, leading and covering disks 3 and 2, and later in belopotosky diffuser and side camera team.This wheel design can significantly reduce the gradient of relative velocities at the back side of the blade so that the efficiency of the wheel is increased by 1-2%, and the maximum efficiency of the supercharger with belopotosky diffuser and side camera team reaches 0,84 is 0.86. The impeller of the centrifugal blower, which includes the following behind the wheel belopotosky diffuser and side camera team, with the radial position of the blades, outlined by a single radius, covering the disk, the axial inlet flow angles of output blades 30othe relative width of the output 0,055-0,065, relative input diameter at the ends of the blades of 0.5, angles of inclination of the covering disk 6-8onumber of blades 10-12, characterized in that the interscapular channels are performed with a minimum diffusionally by providing the maximum width of these channels at the entrance to the wheel that carries the
FIELD: mechanical engineering; air blowers, compressors and outer vane machines.
SUBSTANCE: invention relates to electric compressors, turbocompressors for supercharging internal combustion engines, air blowers and other vane machines. Proposed high-speed rotor of blower provides practically complete elimination of rotor unbalance owing to provision of minimum tolerable deformation of shaft when rotor parts pack is tightened by nut, thanks to which vibration and noise of turbocompressor in operation are considerably reduced, service life of bearings is increased and rubbing of impeller or turbine of compressor against base members is prevented which improves operating capabilities and reduces energy consumption. For this purpose, according to first design version, rotor is furnished with plates, each placed between end face of compressor impeller bushing and nut. Said plate has concave spherical surface at one side adjoining convex spherical surface of nut, and at other side, flat surface adjoining flat end face of bushing of compressor impeller. Ring groove is made on each bushing of compressor impeller between blades and end face of compressor impeller bushing. According to second version, ring groove is made on each bushing of compressor impeller between blades and end face of compressor impeller bushing provided with concave spherical surface adjoining convex spherical surface of nut.
EFFECT: improved operating capabilities, reduced energy consumption.
3 cl, 2 dwg
FIELD: mechanical engineering.
SUBSTANCE: rotor (10) of multi-stage compressor comprises axial section (12) of the rotor followed by the centrifugal section (14) of the rotor. Axial section (12) of the rotor and centrifugal section (14) of the rotor are interconnected by means of a diffusion junction to define a unit working wheel having blades (22) and (36). The sections of the axial stage and centrifugal stage go one into the other without discontinuities.
EFFECT: improved design.
21 cl, 1 dwg
FIELD: power machine engineering, possibly production of large-size pumps with complex-shape spatial interval of inter-blade ducts, mainly main circulation pumps used in nuclear power plants in nuclear electric power stations.
SUBSTANCE: impeller is formed of two parts; each part includes two mutually joined members. One member is in the form of protrusion formed on main disc as one piece with it. Other member is formed on covering disc as one piece with it. Members of each blade are milled in order to provide possibility of their joining by butt welding and to realize quality control of their joining by irradiating with penetration irradiation. After joining before welding, portions of impeller are geometrically divided by means of surface of revolution. At movement along said surface from inlet to impeller towards its outlet the least angle between rotation axis of impeller and line normal to said surface of revolution does not increase.
EFFECT: enhanced quality of product due to increased strength of welded seam and elimination of distortion of shape of inter-blade ducts.
5 cl, 9 dwg
FIELD: mechanical engineering; fans and ventilators.
SUBSTANCE: invention relates to improved centrifugal fan. Proposed fan with single of double intake has enclosed type impeller formed by rotating bladed wheel 10 with at least one cover member 13. Blades 11 of fan impeller are flat, tilted backwards relative to direction of impeller rotation, and cover member 13 is provided with section 13A on truncated cone surface, first curvilinear section 13B on surface and second curvilinear section 13C on surface in direction of flow. Radius of curvature of first curvilinear section of surface is less than radius of curvature of second curvilinear section of surface.
EFFECT: increased efficiency of centrifugal fans owing to use of optimum combination of parameters, for instance, number, shape and arrangement of blades of fan impeller and form of cover member.
8 cl, 9 dwg
FIELD: mechanical engineering; compressors.
SUBSTANCE: invention relates to impellers of centrifugal machines. Proposed impeller has disk with blades fitted on disk. Layer of material is attached to surface of disk opposite to blades in which ratio of modulus of elasticity to density is less than that of disk material, for instance, glass plastic can be used for this purpose. Layer of similar material is arranged near outer diameter of plate of cover and main disk in zone of interblade channels. At elastic vibrations of disks of impeller in places of contact of material, internal friction, dissipation of energy of vibrations and reduction of their amplitude in places of contact of material appear, which has favorable effect on resistance of impeller to cyclic loads and provides required dynamic strength characteristics of impeller at relatively high peripheral velocities.
EFFECT: increased strength of impeller and high peripheral velocities.
2 cl, 1 dwg
FIELD: mechanical engineering; compressors.
SUBSTANCE: layer of composite material is applied to surface of impeller disk. Ratio of modulus of elasticity to density of said material is less than material of disk. Layer of glass plastic can be used for this purpose. Layer of composite material featuring smaller ratio is arranged in ring groove found of periphery in disk body. At elastic vibrations of impeller disk internal friction interaction effect appears in place of contact of materials. As a result, vibration energy is dissipated and vibration amplitude is reduced which contributes to resistance of impeller to cyclic loads.
EFFECT: provision of required dynamic strength characteristics at relatively high peripheral speeds of rotation.
FIELD: ventilation system.
SUBSTANCE: invention relates to main unit of centrifugal fans used for ventilation of industrial and living rooms and servicing of different technological processes where liberation of hot gases, smoke and harmful admixtures takes place. Invention is aimed at reduction of area of heat transfer from hub of impeller to shaft of centrifugal fan motor and creation of air flow to cool front end plate of motor and hub. According to invention, impeller of centrifugal fan consists of hub, main and cover flat disks and working blades. Hub is provided with cylindrical boss from side of mounting of main disk and through holes located around axle of rotation of impeller. Axes of through holes are parallel to axle of rotation of impeller, and their number and diameter are chosen so that summary area of said holes is equal to 0.1-3.0% of area of intake hole of centrifugal fan, and axes of said through holes are arranged over circumference of diameter equal to Dh+2.5d±10%. Distance between two adjacent axes of through holes is 1.5d±10%.
EFFECT: increased thermal stability, reliability and reduced cost of operation of centrifugal fans.
FIELD: ventilator engineering, namely, construction of centrifugal smoke exhauster, which may be used in gas cleaning systems in metallurgy and during production of building materials, and also for kitting steam boilers of heat and power stations.
SUBSTANCE: centrifugal smoke exhaust consists of spiral body, input branch pipe, guiding machine and working wheel. Working wheel has 24 radially terminating blades with exit angle equal to 90°, circles drawn along an arc with a radius equal to 34% of external diameter of working wheel, measured along exit edges of blades. Diameter of entrance into working wheel equals 62% of external diameter of working wheel. Width of working wheel at exit equals 13% of external diameter of working wheel. Angle of inclination of surface of covering disk to rotation plane of working wheel equals 15°.
EFFECT: ensured increase of efficiency from 70% to 77% for smoke exhauster with radially terminating blades, which is used for moving substances with dust, prone to sticking to blades of working wheel, which is achieved due to optimal selection of dimensions of working wheel of smoke exhauster.
FIELD: mechanical engineering; turbomachines for aircraft.
SUBSTANCE: invention relates to rotors of turbomachines used, particularly, in aviation, in which drum 124 in form of cylindrical solid of revolution rotation around longitudinal axis is manufactured of metal alloy, and it has curvilinear profile between front and rear ends 124b. Said profile is formed by ring shell arranged around said longitudinal axis, being located in radial direction to both sides from surface of rotation, with generatrix 134. Rear end 124b is provided with stiffening element. Said stiffening element is provided with at least one composite element 140 fitted on rear end 124b of drum and having fibers, and matrix made of polymeric material. Drum is designed for forming rotor of low-pressure compressor.
EFFECT: enlarged operating capabilities.
4 cl, 5 dwg
FIELD: mechanical engineering; fans and ventilators.
SUBSTANCE: invention relates to impeller of centrifugal fan with blades 2 tilted opposite to direction of rotation 8 (backwards tilted impeller) in which outer edge areas 14, 7 of front and rear disks 3, 1 project behind outer diameter DAs of blades. Diffusion space, thus set between rear and front disks 1, 3 and output diameter DAs of blades and outer diameter DN of blades, provides effective conversion of kinetic energy of fluid medium into pressure potential (transformation of kinetic energy into static pressure). Profile of cross section of diffusion space is made rectangular or trapezium widened radially outwards.
EFFECT: increased efficiency of centrifugal fan.
10 cl, 9 dwg