Contrast difference between centrifugal air compressor and screw air compressor
Bolet air compressor introduces the comparison of centrifugal and screw air compressors, which can help you better understand the advantages and disadvantages, similarities and differences between the two, and the use of occasions:
The basic principle of centrifugal air compressor:Centrifugal air compressor is a machine that generates pressure and is a kind of turbine air compressor。TURBINE is the English translation of "turbine", which is a rotating impeller。Centrifugal air compressor has been widely used in the total low pressure air separation unit, and there is a trend that centrifugal air compressor replaces piston air compressor。
1, centrifugal air compressor: refers to the movement of gas in the air compressor is carried out along the radial direction perpendicular to the shaft of the air compressor。
2. Working principle:In the process of rotating the working wheel, due to the role of rotating centrifugal force and the diffuser flow in the working wheel, the pressure of the gas is increased, and the speed is also improved。The velocity energy is then further converted into pressure energy in the diffuser。It can increase the pressure of the gas。
The difference between centrifugal air compressor and screw air compressor
3、特点：
Centrifugal air compressor is a speed type air compressor, compared with other air compressors:
优点：
⑴ Large exhaust volume, uniform exhaust gas, no pulse of air flow。
⑵ High speed。
(3) No lubrication is required in the machine。
(4) Good sealing effect, less leakage phenomenon。
(5) Flat performance curve, wide operating range。
(6) Easy to automate and scale。
With less wearing parts, less maintenance and long operation cycle。
缺点：
The adaptability of the operation is poor, and the nature of the gas has a greater impact on the operating performance。The load changes greatly when the unit starts, stops and runs。
(2) The airflow speed is large, and the parts in the flow channel have greater friction loss。
(3) There is surge phenomenon, which is very harmful to the machine。
4. Scope of application:Large and medium flow, medium and low pressure occasions。
5、分类：
(1) According to the type of shaft: single-shaft multi-stage type, several impellers are connected in series on one shaft。
Two-axis four-stage type, the four impellers are cantilevered at both ends of the two pinion, and the rotating * motor drives the pinion through the big gear。
(2) According to the type of cylinder: horizontal split and vertical split。
(3) Classification according to the form of interstage cooling:Cooling outside the stage, after each stage of compression, the gas output machine enters the cooler。
In the machine cooling, the cooler and the casing cast as one。
(4) According to the compression medium classification: air compressor, nitrogen air compressor, oxygen air compressor and so on。
Screw air compressor is a kind of positive displacement air compressor, the compression of air is achieved by the volume change of the tooth groove of the Yin and Yang rotor installed in the housing。The rotor pair rotates in the case precisely matched with it, so that the gas between the rotor tooth slots constantly produces periodic volume changes along the rotor axis, from the suction side to the discharge side, to complete the suction, compression, exhaust three working processes。
Characteristics of screw air compressor:
1) Screw air compressor and piston air compressor are the same, both belong to positive displacement air compressor。In terms of the use effect, the screw air compressor has the following advantages。
2) High reliability。The screw air compressor has few parts and no wearing parts, so it runs reliably and has a long life。
Easy operation and maintenance。Screw air compressor has a high degree of automation, and the operator does not have to go through a long time of professional training, which can achieve unattended operation。
3) Good power balance。Screw air compressor has no unbalanced inertial force, the machine can work smoothly at high speed, and can achieve no foundation operation, especially suitable for mobile air compressor, small size, light weight, and less floor space。
4) Strong adaptability。The screw air compressor has the characteristics of forced gas transmission, the volume flow is almost not affected by the exhaust pressure, and can maintain a high efficiency in a wide range. In the case of no change in the air compressor structure, it is suitable for a variety of working conditions。
The main disadvantages of screw air compressor:
1) High cost。Because the rotor tooth surface of screw air compressor is a spatial curved surface, it needs to be processed on expensive special equipment with special cutting tools。In addition, there are also high requirements for the processing accuracy of the oil and gas drum of the screw air compressor。
2) Can not be applied to high pressure situations。Due to the limitations of rotor stiffness and bearing life, screw air compressors can only be applied to medium and low pressure ranges, and the exhaust pressure is generally not more than 3Mpa。
3) Not suitable for small displacement occasions。Screw air compressors rely on gap sealing gas, and at present, only the volume flow is greater than 0.At 2M3/min, the screw air compressor has superior performance。
2023.04.25
Current Location:
