Multifunctional low-noise rotor of krysak

Abstract

A low-noise multifunctional rotor for centrifugal / axial fans, vertical wind turbines and hydromachines is disclosed. The rotor comprises at least two blades fixed around a central shaft (1) by fastening elements (6). Each blade incorporates a first helical plate formed from a convex-concave rotation surface (3) and a second helical plate formed from a concave -convex rotation surface (4). The rotation radii of surface points, measured in planes perpendicular to the rotor axis, are equal to the radii defined in the generating surfaces and increase progressively from the lower to the upper part of the rotor, establishing an ascending spiral flow path. Novelty resides in that one side of plate (3) is aligned at an acute angle towards the inner face of plate (4) and is spaced therefrom by a gap, which reduces turbulence, noise and vibration while improving flow efficiency.

Description

[0001] MULTIFUNCTIONAL LOW-NOISE ROTOR OF KRYSAK

[0002] The utility model falls into the power mechanical engineering and can be used in production of centrifugal rotors and axial fans, vertical wind generators, hydromachines.

[0003] Known spiral centrifugal fan and equipment for preparation of air, where the centrifugal windwheel is located in the center of the case, the inner wall of the centrifugal windwheel's case is equipped with one or a number of spiral air lines, the spiral air lines are located along the centrifugal wheel’s circumference, the air collector is located on the radially external side of the centrifugal wheel, the blades of the centrifugal windwheel are bent towards the rotation axis, and the spiral wind line directs the air coming out of the centrifugal windwheel forward in the spiral direction [China invention patent CN 105626552 A, 2016. 06,01], The disadvantages of such fan lie in the noise and volume occurring in the spiral air lines.

[0004] Known vertical wind generator rotor containing three vertically places blades, each of which is made of fixed width stripes. The opposite ends of each blade are twisted longitudinally under the angle of approximately 90 degrees. A cylindric surface, to which the blades are attached with space between them, is located along the rotor’s axis [USA invention patent US 2008 / 0095631 A1 04.24.2008]. When rotating around the rotor’s axis, the blades disturb the air, which causes considerable noise and vibration.

[0005] The closest to the claimed rotor in technological terms is the centrifugal medium movement direction rotor containing at least two arched blades located along its rotation axis, each of which is fixed using a fastening element. The rotor blades are made as parts of circular convex-concave rotation surfaces, axes of which match the rotor’s rotation axis, and the plates of the blades form a space. In the centrifugal medium movement direction rotor, the end sections of the sides of blade plates closest to the rotation axis of the rotor are located at a minimum technologically required distance from each other or partially connected [Ukraine utility model patent No. 152842 MПK F03B 3 / 08, F03B 3 / 12, F03D 1 / 06, B64C 11 / 16,

[0006] 19.04.2023], Attachment of the plate ends forms a conical surface, which can cause certain noise effects while rotating around the rotor. The placement of the blade plates ensures insignificant efficiency of the rotor.

[0007] The purpose of the utility model is to suggest a design of a multifunctional low-noise rotor that would ensure high efficiency of centrifugal, axial fans, vertical wind generator, with low noise and vibration level.

[0008] The solution for the given objective is as follows.

[0009] The proposed multifunctional low-noise rotor contains at least two blades placed around its rotation axis using fastening elements, and each of the blades contains at least two helical plates made as parts of convex, concave, convex-concave rotation surfaces, with rotation radii of the surface points in the planes perpendicular to the rotor’s rotation axis equal to the rotation radii of these points in the rotation surfaces. The lower part of the rotor has blade plates with lower rotation radii of their surface points. When the distance along the rotor’s axis to its upper part increases, the rotation radii of these points increase, the convex-concave plates are achieved by means of connection to the convex in the upper part of the concave parts of the rotation surfaces, according to the utility model, the ends of the one of the sides of the convex-concave blade plates are aligned under an acute angle towards the inner side of the concave plates, as well as located at a distance from the ends of one of the sides of the concave plates, and with a gap towards the inner side of the concave plates.

[0010] The proposed multifunctional low-noise rotor, according to the utility model, the concave blade plates are made with shaped apertures.

[0011] The proposed multifunctional low-noise rotor, according to the utility model, the convex-concave blade plates are made with shaped apertures.

[0012] The proposed multifunctional low-noise rotor, according to the utility model, has the ends of one of the sides of the convex blade plates aligned under an acute angle towards the inner side of the concave-convex plates, as well as located at a distance from the ends of one of the sides of the concave-convex plates with a gap towards the inner side of the concave-convex plates.

[0013] The design of the multifunctional low-noise rotor (hereinafter - rotor) enables its use as a node of a centrifugal fan. The claimed rotor is illustrated in the attached drawings. Fig. 1 shows a schematic design of the proposed rotor, Fig. 2 shows A-A section. The proposed rotor design (see Fig. 1, 2) contains shaft 1, the rotation axis of which matches the geometric axis 2 of the rotor’s rotation, blades consisting of convex-concave plates 3 and concave plates 4, lines of shaped apertures 5, concave plates, fastening elements 6 of the blades.

[0014] An engine is connected to shaft 1 of the rotor in order to operate the centrifugal fan. When shaft 1 of the rotor rotates in the direction opposite to the increase of the radii of helical plate surface points along its geometric axis 2 with fastening elements 6 of the blade connected to it, air flow moves lengthwise from the lower part of the rotor to the upper part due to displacement of the air volume from the space between the convex-concave plates 3 and concave plates 4 of the blades with new portions of incoming air. Air outflow perpendicular to the rotor’s rotation axis is directed through the shaped apertures 5 of concave plates 4, as well as due to the concavity of the convex-concave plates in the perpendicular direction.

[0015] During operation of the centrifugal fan, all the parts of the surfaces of helical plates of the rotor blades rotate, pierce the air without disturbing it, without causing turbulence or cavitation, enabling air flow movement with a minimum noise and vibration level.

[0016] When using the proposed multifunctional low-noise rotor as part of a vertical wind generator, schematic design of which is shown in Fig. 3 and section B-B in Fig. 4, the geometric axis

[0017] 2 of the rotor is place perpendicularly towards the wind flow. When shaft 1 of the rotor rotates, the wind flow is directed to the space between the convex-concave plates 3 and concave plates 4 of the blades and moves along the space from the lower to the upper part of the rotor and causes action of the pressure forces under the attack angle on the outer surface of the convex-concave plates 3 and the inner surface of the concave plates 4, which forms torque and rotates the blades connected with fastening elements 6 to the shaft 1 relative to the rotor's axis. Shaped apertures 5 located on the convex-concave plates, and the direction of the convex-concave plates 3 under an acute angle towards the inner surface of the concave plates 4 cause an additional air flow towards the inner surface of the concave plates, which reinforces the action of the torque forces and intensifies the rotor's rotation process. Due to the fact that the helical plates 3 and 4 of the blades are made of the rotation surfaces, and the ends of convex-concave plates 3 are located with a gap from the inner side of concave plates 4, the helical blade plates, when rotating against the rotor's axis, pierce the air volume without disturbing it and without causing noise or vibration.

[0018] Possible use of the proposed multifunctional low-noise rotor in axial fans, rotor design is shown in Fig. 5 and section C-C in Fig. 6. During rotation of shaft 1 with the connected fastening elements 5 of the blade around the geometric axis 2 of the rotor opposite to the increase of the helical blade rotation point radii, air flow moves in the axial direction, longitudinally from the lower part of the rotor to the upper, in the space between the outer and inner surfaces of the convex plates 3 and the inner surface of blades 4, due to air displacement by the new incoming portions of air. The movement of the air flow in the axial direction happens due to the upper parts of the convex-concave plates 4 parallel to the direction axis. The fan operates at low noise and vibration, as the helical plates duplicate the nominal circular surfaces when rotating around the rotor’s axis, as well as pierce the air and do not disturb it.

[0019] The fastening elements that connect the helical plates of the blades to the shaft are placed perpendicular to the roror's rotation axis, made of a narrow strip of sheet metal, and the ends of both sides are made V-shaped, which contributes to the decrease of the noise level during rotor’s rotation.

Claims

UTILITY MODEL CLAIMSThe multifunctional low-noise rotor contains at least two blades placed around its rotation axis using fastening elements, and each of the blades contains at least two helical plates made as parts of convex, concave, convex-concave rotation surfaces, with rotation radii of the surface points in the planes perpendicular to the rotor’s rotation axis equal to the rotation radii of these points in the rotation surfaces. The lower part of the rotor has blade plates with lower rotation radii of their surface points. When the distance along the rotor’s axis to its upper part increases, the rotation radii of these points increase, the convex-concave plates are achieved by means of connection to the convex in the upper part of the concave parts of the rotation surfaces, which differs in that the ends of the one of the sides of the convex-concave blade plates are aligned under an acute angle towards the inner side of the concave plates, as well as located at a distance from the ends of one of the sides of the concave plates, and with a gap towards the inner side of the concave plates.Multifunctional low-noise rotor as per cl. 1, which differs in that the concave blade plates are made with shaped apertures.Multifunctional low-noise rotor as per cl. 1, which differs in that the convex-concave blade plates are made with shaped apertures.Low-noise rotor as per cl. 1, which differs in that the ends of one of the sides of the convex blade plates are aligned under an acute angle towards the inner side of the concave-convex plates, as well as located at a distance from the ends of one of the sides of the concave-convex plates with a gap towards the inner side of the concave-convex plates.

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