There are several types of air compressor and their advantages and disadvantages

What are the types of air compressor and the advantages and disadvantages

air compressor as a kind of power energy consumption products, the scope of its application and industry is very wide, air compressor as an important energy of industrial products, can be called the "life gas source" of industrial products ".

Air compressor is a kind of mechanical equipment that compresses gas volume and increases gas pressure and transports gas. It can reduce gas volume, increase pressure, and have certain kinetic energy. It can be used as mechanical power or other purposes.

Air compressor motors, turbines and other power devices to power to produce compressed air, long-term use in various industries is also an indispensable part.

What are the types of air compressors? According to the compressed gas, compressors can be divided into air compressors, oxygen compressors, ammonia compressors, natural gas compressors, etc.

What are the types of air compressor, according to the installation project category is divided into: piston compressor, rotary screw compressor, centrifugal compressor (motor drive) and so on.

What are the types of air compressors? According to the compressor gas method, it can be divided into two categories: positive displacement compressors and power compressors. According to the structure type and working principle, positive displacement compressors can be divided into reciprocating (piston, diaphragm) compressors and rotary (sliding, screw, rotor) compressors; power compressors can be divided into Axial flow compressors, centrifugal compressors and mixed flow compressors.

What are the types of air compressors, according to the number of compression can be divided into: single-stage compressor, two-stage compressor, multi-stage compressor.

What are the types of air compressors? According to the arrangement of the cylinders, they can be divided into: vertical compressors, horizontal compressors, L-type compressors, V-type compressors, W-type compressors, sector compressors, M-type compressors, H-type compressors.

What are the types of air compressors: According to the arrangement of cylinders, they can be divided into: tandem compressors, parallel compressors, duplex compressors, and symmetrical balanced compressors-the cylinders are arranged horizontally on the crankshaft journals at 180 ° to each other. On both sides of the crankshaft, it is arranged in H-type, D-type, and M-type, and its inertial force can basically be balanced (large compressors are all developing in this direction).

What are the types of air compressors: according to the final exhaust pressure of the compressor, it can be divided into: low pressure compressor-exhaust pressure is 0.3~1.0MPa; Medium pressure compressor-exhaust pressure is 1.0~10.0MPa; High pressure compressor-exhaust pressure is 10.0~100.0MPa; Ultra high pressure compressor-exhaust pressure is above 100.0MPa.

What are the types of air compressors: according to the size of compressor displacement, it can be divided into: micro compressor-gas transmission volume is less than 1m 3/min; Small compressor-gas transmission volume is 1 ~ 10m 3/min; Medium-sized compressor-gas transmission volume is 10~100 m3/min; Large compressor-gas transmission volume is above 100 m3/min;

what are the types of air compressors: According to the lubrication method, it can be divided into: oil-free lubrication compressor and oil-lubricated compressor.

What are the types of air compressors: According to the cooling method, it can be divided into: water-cooled compressors and air-cooled compressors.

What are the types of air compressors? According to the types of transmission, they can be divided into: compressors powered by electric motors, compressors powered by steam, compressors powered by internal combustion engines, and compressors powered by steam turbines.

What are the types of air compressors? According to the transmission methods of power machines and compressors, they can be divided into: rigid coupling direct drive compressors, flexible coupling direct drive compressors, reduction gear drive compressors, belt drive compressors, Free piston compressors without crankshaft-connecting rod mechanism.

What are the types of air compressors, which are divided into volume type and speed type according to the working principle;

volume type can be divided into piston type, screw type, slide type three;

speed type can be divided into two kinds of centrifugal and axial flow.

classification of air compressor air compressor is divided:

1. Speed type;

2. Volumetric type; Volumetric type is divided into rotary type and reciprocating type;

rotary type:(1) rotor type;(2) screw type;(3) slide type.

Reciprocating:(1) Piston type;(2) Membrane type.

1. According to the exhaust pressure, it is divided into: low pressure air compressor exhaust pressure ≤ 1.0MPa; Medium pressure air compressor 1.0MPa <exhaust pressure ≤ 10MPa high pressure air compressor 10MPa <exhaust pressure ≤ 100MPa

2. the size of the exhaust volume is divided into: small air compressor 1m 3/min <exhaust volume ≤ 10m 3/min large air compressor exhaust volume> 100 m3/min the exhaust volume of the air compressor refers to the free gas flow in the suction state. General provisions: shaft power <15KW, exhaust pressure ≤ 1.4MPa for micro air compressor.

3. According to the relative position of the center line of the cylinder and the ground, it is divided into: vertical air compressor-the center line of the cylinder is arranged vertically with the ground. Angle type air compressor-the center line of the cylinder and the ground at a certain angle (V type, W type, L type, etc.). Horizontal air compressor-the center line of the cylinder is parallel to the ground, and the cylinder is arranged on one side of the crankshaft. Dynamic balance type air compressor-the center line of the cylinder is parallel to the ground, and the cylinders are symmetrically arranged on both sides of the crankshaft.

4 According to the structural characteristics, it is divided into: single action-gas is compressed only on one side of the piston. Double-acting-the gas is compressed on both sides of the piston. Water-cooled-refers to the cylinder with a cooling water jacket, water cooling. Air-cooled-the outer surface of the cylinder is cast with fins for air cooling. Fixed-air compressor set fixed on the foundation.

The performance parameters of the compressor mainly include volume, flow, suction pressure, discharge pressure, working efficiency, input power, output power, coefficient of performance, noise, etc.

The compression mode of air compressor is divided into volume type and turbine type.

Volumetric air compressor (Positive Displacement Compressor) is to reduce the volume of compression purposes.

Turbo air compressor (Dynamic Compressor or Turbo Compressor) is based on the movement of energy into compression energy to achieve the purpose of compression.

The volumetric type and the turbine type are distinguished by the following table.

1.Reciprocating compressors reciprocating air compressor is common in various industries and customers generally choose air compressor.

Reciprocating air compressor features are as follows:

① Easy to higher compressed air.

The compression efficiency is high.

The pressure-flow characteristics are relatively stable.

④ Low price.

On the contrary, reciprocating air compressor is a piston reciprocating motion to compress, there are many disadvantages. ① Reciprocating inertia, its rotation speed is limited.

② Vibration is generated by inertia.

③ Compressed air with pulsation.

The oil-free air compressor outside the cylinder needs lubricating oil, the discharge of compressed air contains lubricating oil.

In the past, it was called air compressor. Reciprocating air compressor was replaced by screw turbine type when large flow rate was required.

There is a tendency to be replaced by screw air compressors in the medium-sized air compressor industry. Small air compressor industry is also slowly replaced by screw type. But possession of a seat is indispensable.

Reciprocating air compressor in the medium-high pressure air compressor industry is essential and occupies an important position.

2.Rotary screw compressors

screw rotary displacement air compressor is the most common screw air compressor.

The screw of the screw air compressor has a rotating main screw (Male Rotor) and a secondary screw (Female Rotor).

The auxiliary screw rotates to inhale air for compression and discharge to achieve air compression.

Screw air compressor can distinguish oil-free oil injection screw air compressor with or without lubricating oil.

2.1 oil-injected screw air compressor

the oil-injected screw air compressor has the appropriate amount of lubricating oil to release the heat generated when the compressed air is released and the compression space is closed at the same time,

lubrication advantages. As follows:

directly cool the appropriate amount of lubricating oil, the discharge temperature is reduced, and the compression process is close to higher efficiency than the same temperature compression.

The lubricating oil is directly cooled to improve the compression ratio of each stage.

The injection of lubricating oil can seal between the rotating body, between the rotating body and the box. Cooling internal thermal expansion is reduced, the gap is reduced, at low speed to very high efficiency.

The low speed can achieve high efficiency, low vibration, low noise.

⑤ Internal lubrication, the main screw can directly drive the secondary screw.

⑥ can choose the appropriate capacity adjustment, effective operation.

⑦ The exhaust gas has no pulsation.

2.2 oil-free screw air compressor

oil-free screw air compressor discharge compressed air without lubricating oil, its characteristics are as follows:

① Between the screw and the box, there is no contact between the screws, no internal lubrication is required, and the compressed air can be cleaned without oil.

② No pulsation of discharge pressure.

③ Convenient maintenance and overhaul.

④ The vibration is small.

The only drawback is that the discharge pressure is limited.

3.Turbo compressors

turbo air compressor is a rotating body of mechanical energy into air movement energy.

Centrifugal air compressor is characterized by rotary, has the following advantages.

The discharge pressure has no pulsation and high stability.

② Avoid mixing lubricating oil into clean air.

③ High-speed rotary type, under the same power, save energy than other air compressors.

shortcomings of centrifugal air compressor:

① The pressure rise is related to the specific gravity of the gas and the speed of the rotary body. The pressure rise of each stage is lower than that of the volume type, and the efficiency will be reduced when the flow rate is small.

The compression characteristics are sensitive to design, machining degree and use conditions.

③ The pressure-displacement characteristics include instability factor, and vibration occurs when the air volume is reduced to 70 ~ 80%.

4.Diaphragm compressors

diaphragm air compressor is a volumetric oil-free air compressor. Diaphragm movement is divided into mechanical operation and oil pressure operation.

The mechanical diaphragm air compressor is a small air compressor. The mechanical price is relatively low, the mechanism is simple, and the compression pressure is lower than the atmospheric pressure.

The mechanical type needs to take into account the weight of the bearing and is limited in use. However, the hydraulic type is easier to generate high pressure than the mechanical type.

Diaphragm air compressor has the following advantages:

the sealing performance is strong, can be stable pressure.

② completely separated from the gas compression, can be up to 100 oil-free clean compressed air. The disadvantage of this form is that the discharge is low and the compression ratio is limited. Mechanical use of synthetic diaphragm. The oil pressure type adopts metal diaphragm, which can form high pressure. These two can be combined into a two-stage compression.

The mechanical diaphragm air compressor forms a high pressure, and the pressure vessel is used to seal the box and the air compressor.

5.Rotary sliding vane compressor rotary blade air compressor

A rotary body is arranged inside the cylinder, and blades are arranged on the rotary body.

Blade and cylinder space revolving body rotation change compressed air.

Lubricating oil is usually used to inject into the cylinder to produce sealing, lubrication, and at the same time to solve the heating oil cooling form.

This form of blade and cylinder or rotating body friction, the blade material is very important, should choose high heat resistance, oil or moisture absorption rate of small materials.

But there are the following disadvantages.

① From the structure, it is inevitable to produce friction due to rotation.

② The blade strength is limited to the rotation speed. When the rotation speed is high, the two-stage compression type is used, but the volume will increase.

③ High pressure can not be made on the structure.

6.Rotary tooth compressors

the end face of the rotary body needs to be balanced and engaged with the external gear. Compared with the screw type, it is not possible to rotate only one of the screws. Mainly applicable to the production of oil-free air compressor. This device is made with 2.5bar one-stage compression and 7bar two-stage compression. Can be up to 10bar pressure. The rotary body does not need precision machining, and the mechanism is relatively simple.