CN110748483A

CN110748483A - Main engine noise reduction structure of screw compressor

Info

Publication number: CN110748483A
Application number: CN201910767304.3A
Authority: CN
Inventors: 朱尉颖; 吴霞俊; 王晶晶; 荣俊翔; 徐志刚
Original assignee: Wuxi Compressor Co Ltd
Current assignee: Wuxi Compressor Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-02-04

Abstract

The invention relates to the technical field of screw compressors, in particular to a noise reduction structure of a main machine of a screw compressor, which can effectively realize noise reduction and comprises a male rotor and a female rotor.

Description

Main engine noise reduction structure of screw compressor

Technical Field

The invention relates to the technical field of screw compressors, in particular to a main engine noise reduction structure of a screw compressor.

Background

The male and female rotors are the core components of the screw compressor main machine. When the main engine is operated, fluid vibration noise is generated due to vibration caused by fluid flow. The suction noise and the exhaust noise generated by the host machine are periodically increased or decreased in the working volume and the suction and exhaust ports in the communication process, and simultaneously, the fluid flow characteristics are changed violently along with the periodic change of the communication area between the working volume and the suction and exhaust ports, so that larger airflow pulsation is generated, and pneumatic noise is induced.

In the normal working state of a general main machine, when air is sucked, air enters a meshing area, the speed is redistributed due to the sharp change of the boundary, the flow resistance is greatly increased, the suction noise of the air is aggravated, and the vibration noise of a compressor is a problem, so that the noise pollution is caused, and the performance and the reliability of a machine are influenced.

Disclosure of Invention

In order to solve the problem of noise pollution caused by the simultaneous generation of the existing air suction noise and the existing exhaust noise, the invention provides a main machine noise reduction structure of a screw compressor, which can effectively realize noise reduction.

The technical scheme is as follows: the utility model provides a structure of making an uproar falls in screw compressor host computer, its characterized in that includes positive rotor and negative rotor, and the one end that admits air towards, the tooth side of positive rotor is provided with first chamfer, another side is provided with first radius, the tooth side of negative rotor be provided with second radius, the opposite side that first chamfer corresponds be provided with the third radius that first radius corresponds.

It is further characterized in that the included angle of the first chamfer is 163 degrees;

the maximum value of the radius of the first rounding is the same as that of the radius of the second rounding.

After the invention is adopted, after the air inlet end surfaces of the male rotor and the female rotor are subjected to rounding and trimming operation, the air can enter along the rounded angle in the air inlet direction through the matching of the chamfering and the rounding, the rounded angle is guided to overcome the energy loss caused by local resistance, and the purpose of reducing noise is achieved

Drawings

FIG. 1 is a schematic view of a prior art male rotor meshing with a female rotor;

FIG. 2 is a schematic view of a male rotor portion according to the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic diagram of the female rotor section of the present invention;

fig. 5 is a sectional view taken along line B-B in fig. 4.

Detailed Description

As shown in the figures 2 to 5, the noise reduction structure of the main engine of the screw compressor comprises a male rotor 1 and a female rotor 2, and is oriented to one air inlet end, a first chamfer is arranged on one side face of a tooth of the male rotor 1, a first radius is arranged on the other side face of the tooth of the female rotor 2, a second radius corresponding to the first chamfer is arranged on one side face of the tooth of the female rotor, a third radius corresponding to the first radius is arranged on the other side face of the tooth of the female rotor, the included angle α of the first chamfer is 163 degrees, and the maximum values of the radii of the first radius and the second radius.

Specifically, in fig. 3, ABC-DEF is a male rotor tooth profile (before rounding and trimming), Ab1b2C-De1e2F is a tooth profile after rounding and trimming, an included angle between a b1b2 line and a BC extension line is 17 °, and rounding and trimming are performed on a b1 point and a b2 point respectively; the arc e1e2 takes O1 as a center of a circle, r1 is radius rounding, namely the distances from the DE edge and the EF edge of O1 are r1, and the maximum value of r1 is 6 mm.

In fig. 5, ABCD is the female rotor profile (before rounding and trimming), and Ab1b2c1c2D is the rounded and trimmed profile. The arc b1b2 is an arc with O2 as the center of a circle and r2 as the radius, namely the distance from the center of a circle O2 to the Ab1 side and the b2c1 side is r2, and the maximum value of the r2 is 6 mm; the arc c1c2 is an arc with a center of O3 and a radius of r3, that is, the distance from the center of O3 to the side b2c1 and the CD side is r3, and the maximum value of r3 is 25 mm. The values of r2 and r3 are chosen such that the value of O '' b2 is substantially equal to the minimum value of O '' c1, i.e., the value of b.

When air suction is carried out, the male rotor 1 is meshed with the female rotor 2, the first rounding surface of the male rotor 1 is firstly contacted with the third rounding surface on the female rotor 2 and then continuously rotates, the first rounding surface of the male rotor 1 is contacted with the second rounding surface on the female rotor 2, air enters along a fillet in the direction of an air inlet, the noise is reduced, and the purpose of reducing the noise is achieved.

Claims

1. The utility model provides a structure of making an uproar falls in screw compressor host computer, its characterized in that includes positive rotor and negative rotor, and the one end that admits air towards, the tooth side of positive rotor is provided with first chamfer, another side is provided with first radius, the tooth side of negative rotor be provided with second radius, the opposite side that first chamfer corresponds be provided with the third radius that first radius corresponds.

2. The host machine noise reduction structure of the screw compressor as claimed in claim 1, wherein the included angle of the first chamfer is 163 °.

3. The host machine noise reduction structure of the screw compressor of claim 1, wherein the maximum radius of the first radius is the same as that of the second radius.