RU2820082C1 - Air blower rotor - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to rotary machines and can be used in air rotary compressors of external compression. Steel rotor of air blower contains blades, in which through holes with diameter of 1.4–1.6 of radius R_E of rotor outer surface being plugged flush with end surface by steel threaded plugs fitted on sealant and locked by locking screw.

EFFECT: proposed invention allows to reduce loads on rotor bearings, to reduce mass characteristics of compressor and to increase overhaul life of compressor, to reduce requirements to power of its electric drive.

1 cl, 3 dwg

Description

The invention relates to rotary machines and can be used in external compression rotary air compressors.

Rotary machines are compressor (expansion) machines, in which compression (expansion) processes occur in cavities formed by rotors of a certain geometry.

Already existing solutions are known - solid rotors of TS XL compressors from the French company Hibon (https://www.hibon.com/en-mc/products/bare-shaft-positive-displacement-blowers/ts-xl-positive-displacement-blowers) . These technical solutions were adopted as a prototype.

TS XL compressors are external compression rotary compressor machines of the “Roots” type. The design of TS XL compressors uses two solid three-blade rotors with a curved profile surface.

Operating experience with TS XL compressors from the French company Hibon revealed the following disadvantages:

1. Large rotor mass, especially for high-performance compressors, and as a result - increased wear of bearings due to greater load on them, an increase in the mass of the compressor housing to increase its strength and a reduced overhaul interval.

2. High moment of inertia of the rotor, and as a consequence - an increase in the required starting power of the compressor electric drive.

The purpose of the invention is to eliminate these disadvantages of the prototype, namely: reducing the load on the rotor bearings, reducing the mass characteristics of the compressor and increasing the overhaul interval of the compressor, reducing the power requirements of its electric drive.

The goals are achieved by drilling through holes in the rotor blades, installing steel threaded plugs on each side of the holes and fixing them with thread sealant and a locking screw.

The essence of the invention is illustrated by the description and figures, in which:

- fig. 1 - general view of the rotor;

- fig. 2 - view of the rotor blades;

- fig. 3 - graph of the starting characteristics of the electric drive.

Rotor 1 ig. 1) is a steel part with blades made in the shape of an epicycloid, with a radius of the outer surface of the rotor R _E (Fig. 2), each blade has a through hole with a diameter 1.4-1.6 times greater than R _E , closed on both sides with threaded plugs 2, which are fixed in a screwed position with thread sealant and a locking screw 3. To tighten the steel threaded plugs 2, an internal thread is made on each side of the hole to the required depth. Steel screw plugs 2 are installed flush with the end surface of the compressor rotor 1 to minimize the gap between the end surface of the rotor and the compressor housing and reduce the acoustic pressure from the turbulence of gases flowing between the cavities. To install the plugs, they have blind holes for a socket wrench.

The proposed technical solution works as follows. During the assembly of the compressor, internal threads are cut into the drilled holes in rotor 1 to the required depth, steel threaded plugs 2 are screwed into them at the same level with its end surface, and at the junction of rotor 1 and steel threaded plug 2, holes are drilled for locking screws 3 at a minimum distance from the axis of rotation of the rotor, and the hardness of the materials of the rotor and plug must be the same, to ensure the creation of an accurate hole for the locking screw, then the threaded plugs 2 are unscrewed, the threads are lubricated with thread sealant and tightened again, after which the coincidence of the surfaces of the end of the rotor 1 and the threaded plugs is checked 2. The assembly is completed by fixing each threaded plug 2 with a locking screw 3, as a result of which a reliable connection is created that eliminates the flow of gas from the high-pressure cavity to the low-pressure cavity of the rotary machine and the unscrewing of the threaded plugs 2 during operation of the compressor. After assembling the rotor, it is balanced on a balancing machine.

The holes made in the rotor blades 1 reduce its weight by more than 50% and thereby reduce the dynamic loads on its bearings, increasing the service life of the compressor. In addition, with a decrease in the rotor mass, the reduced moment of inertia of the rotor K _j (Fig. 3) decreases by more than 2 times, from the value K _j2 = 2.14 to K _j1 = 1.09, which simultaneously with a decrease in the output time of the asynchronous electric drive to operating mode t _n , reduces its reduced starting torque M _n and current i _n .

Thus, the proposed invention makes it possible to achieve the set goal, namely, to reduce the load on the rotor bearings, reduce the mass characteristics of the compressor and increase the service life of the compressor between repairs, and reduce the power requirements of its electric drive.

Claims (1)

A steel rotor of an air blower having blades, characterized in that the blades have through holes with a diameter of 1.4-1.6 radius R _E of the outer surface of the rotor, plugged flush with the end surface with steel threaded plugs installed on the sealant and locked with a locking screw .