The impeller of a centrifugal compressor
(57) Abstract:The invention is intended for use in compressor engineering. The compressor contains blades. The latter is made of flexible sheet material of high strength. The blades have a flat shape. Each vane is fixed to its front part rigidly to the slat. The latter is part of the hub of the impeller of the compressor. The blade can be fastened in an articulated through the axis. The latter is installed in the hub of the impeller of the compressor. Provides increased efficiency, reduced cost and increased reliability of the compressor. 4 Il. The invention relates to the field of production of compressors, namely, the working wheels of centrifugal compressors with adjustable blades.Known impeller of a centrifugal compressor containing a supporting disk mounted on the outer edge of the blade and the regulating element. The latter is made in the form attached to the drive ring with an elastic petals, bent from disk and placed in front of the entrance edges of the blades. Ring installed in the groove of the drive flush with its surface.At speeds close to the settlement, the petals under Deiss is Otsego body through the wheel.With decreasing speed, the magnitude of the centrifugal forces acting on the petals of the ring is reduced, and the petals due to its elasticity deviate from the disk, thereby affecting the flow of the impeller.Thus, in accordance with the change of the operation mode is the self-regulation of the compressor due to the elasticity of the regulatory element .It is also known impeller of the centrifugal fan, containing a carrier and a coating disks placed between the shoulder blades, consisting of a rigid slat and elastic flap wound on fixed disks rotating axis and secured to it one end.When the fan under the action of the centrifugal force of the elastic flap unwound from the axle. The full unwinding of the elastic flap prevents the spring. At the maximum rotational speed of elastic flaps fully unwound and has a maximum length. The invention allows to expand the range of capacity control fan .Known also fan blade that contains a hard core part and fixed thereto one end of a flexible element, driven by the drum, the location performance fan .As a prototype of the selected traditional design of the impeller of a centrifugal compressor with vanes traditional (hard) design. Depending on the availability of stocks and primary disk distinguish impellers closed, semi-open and open-type .The disadvantages of the above centrifugal compressors are their bulkiness, complexity, and therefore the weighting structure and reducing their reliability.The purpose of the invention is to increase the efficiency, the outlet pressure of the compressor wheel, to expand the area of sustainable performance, reduce weight, reduce cost and improve the reliability of the compressor.To achieve this goal serves the impeller of a centrifugal compressor containing a carrier and a coating disks fastened between the blades, wherein the blades are made of thin, flexible sheet material of high strength, have a flat shape and each attached to its front part rigidly to the slat, which is part of the hub of the impeller of the compressor, or the hinge means axis installed in the hub. The presence of the coating and the primary drive is optional and based >/P>In Fig. 1 shows the impeller of the compressor blades attached to the hub with the axis of the cross section of Fig.2 - impeller of the compressor blades are rigidly secured to the slats of the hub, the cross-section of Fig. 4 - position of the impeller vanes at its operating mode (scapula take the working position under the influence of centrifugal forces), and Fig. 3 - position blade, folded under the action of the pressure of the working fluid (this mode is observed at the beginning of the unwinding of the compressor wheel).The impeller of the centrifugal compressor includes a supporting disk 1, a covering disk 2, and is placed between the blades 3 attached to its front part to the hub 4 with the axis 5 or rigidly fixed to the slat 6, which is part of the hub.When the unwinding of the compressor wheel blades under the action of centrifugal force will be rejected, seeking to take the form of radial rays (Fig.4), and under the action of the pressure of the working fluid (gas or liquid) will seek to snuggle up to each other (Fig.3). As a result, when a value of the number of wheel revolutions and parameters of the working fluid (density, viscosity, volumetric flow rate, and so on) Opredelenie pressure along the blade length is easy to provide a linearly increasing, what is considered the best option , using the blades of a material of constant thickness.If you change the gas flow, that will also change the pressure distribution on the blades of the wheel, which will change the shape of the blades, i.e., the blade will tend to take the most optimal shape for wrapping that will reduce losses. Will be automatic regulation of the outlet angle of the blades.The construction of the centrifugal compressor is easy and simple to manufacture.The use of flexible blades enables automatic regulation of the compressor.Due to the fact that the blades are made of thin sheet material (tape) their strength is higher than solid blades, made of similar material (similar to a high-strength belt spermaholics N. In.Gulia  compared with traditional flywheels design), which allows to increase the circumferential speed and outlet pressure of the compressor.Due to the fact that the blades can be made of more durable materials, can significantly improve circumferential speed, and hence the pressure obtained in one stage of the compressor.In the proposed design dramatically reduces the probability of failure of the compressor in the mode of surge, which is characterized by the reciprocating motion of the working fluid at the reduced flow of gas (or liquid). Since the impeller blades can be bent when a surge oscillations of the gas inside the compressor will not lead to the inevitable destruction of the structure. Due to the stability of the compressor to the mode surge you receive an opportunity to expand the range of costs, which can stably operate the compressor.Sources of information
1. Description of the invention SU 1199978 And CL IPC F 04 D 29/28, 19734. Strizhak L. J. study of the effect of the form interscapular channels C.B. wheels on its characteristics. The dissertation on competition of a scientific degree K. T. N. L., ABI them. Kalinina, 1968, page 155. Seleznev, K. P., " Y. B. and other Theory and calculation of turbochargers: Textbook. a manual for students of engineering specialties. Leningrad: Mashinostroenie, 1986, page 1786. Gulia N. In. The energy storage. M.: Nauka, 1980, 74 pages The impeller of the centrifugal compressor containing a carrier and a coating disks fastened between rotor blades, wherein the blades are made of flexible sheet material of high strength, have a flat shape and each attached to its front part rigidly to the slat, which is part of the hub of the impeller of the compressor, or the hinge, through the axis installed in the hub.
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