Types of air compressors
1. According to the working principle can be divided into three categories: volume type, power type (speed type or turbine type), thermal type compressor.
2. According to the way of lubrication can be divided into oil-free air compressor and oil lubricated air compressor.
3. According to the performance can be divided into: low noise, variable frequency, explosion-proof air compressor.
4. According to the use, it can be divided into: refrigerator compressor, air conditioning compressor, refrigeration compressor, oil field compressor, natural gas filling station, rock drill, pneumatic tools, vehicle braking, door and window opening and closing, textile machinery, tire inflation, plastic machinery compressor, mining compressor, marine compressor, medical compressor, sand blasting and painting.
5.According to the type can be divided into: fixed, mobile, closed.
Positive displacement compressor -- a compressor that directly depends on changing the volume of gas to increase the pressure of gas.
Piston compressor - is a positive displacement compressor, its compression element is a piston, reciprocating motion in the cylinder.
Rotary compressor -is a positive displacement compressor, compression is achieved by the forced movement of rotating elements.
Sliding vane compressor is a rotary variable volume compressor. Its axial sliding vane slides radially on the rotor eccentric to the cylinder block. The air trapped between the slides is compressed and discharged.
Liquid piston compressor is a rotary positive displacement compressor in which water or other liquid is used as a piston to compress gas and then discharge the gas.
Roots double rotor compressor is a rotary positive displacement compressor, in which two roots rotors mesh with each other to intercept the gas and send it from the inlet to the outlet. There is no internal compression.
Screw compressor is a rotary positive displacement compressor, in which two rotors with spiral gears mesh with each other, so that the volume of the two rotors mesh from large to small, so as to compress and discharge the gas. The screw compression components of screw air compressor are manufactured by the latest CNC grinding machine and online laser technology to ensure the accuracy of manufacturing tolerance. Its reliability and performance can ensure that the operating cost of the compressor has been extremely low during its service life. Adjustment compressor, integrated compressor and dryer series are all new products of L / LS series compressor.
Speed compressor is a rotary continuous flow compressor, in which the high-speed rotating blades accelerate the gas passing through it, thus converting the speed into pressure. This transformation takes place partly on the rotating blade and partly on the fixed diffuser or reflux baffle.
Centrifugal compressor - a speed compressor in which one or more rotating impellers (blades usually on the side) accelerate the gas. The main flow is radial.
Axial flow compressor - a speed type compressor in which the gas is accelerated by a bladed rotor. The main flow is axial.
Mixed flow compressor - also a speed compressor. The shape of its rotor combines some characteristics of centrifugal and axial flow.
Jet compressor - the use of high-speed gas or steam jet stream to take away the gas inhaled, and then in the diffuser will be converted into the speed of mixed gas pressure.
Permanent magnet variable frequency compressor - because the variable frequency screw air compressor uses the stepless speed regulation characteristics of the frequency converter, it can start smoothly through the controller or the PID regulator inside the frequency converter; It can quickly adjust and respond to the situation of large fluctuation of gas consumption.
Unipolar compression screw air compressor the head is a screw air compressor composed of a pair of male and female rotors. This type of screw air compressor is widely used.
Bipolar compression screw air compressor - the head is composed of two pairs of male and female rotors. After the first stage compression, the gas enters the second stage compression. The compression ratio is high, and the power is one gear lower than that of the first stage compression air compressor..
Bipolar permanent magnet variable frequency air compressor - a new type of energy-saving product developed since 2014, combined with permanent magnet variable frequency and bipolar compression technology, has high energy-saving efficiency.
Composition and structure
1. Oil circulation system
Before starting, the oil pump control system should be started first. After the oil pump control system is started, all lubricating parts of the air compressor should be well lubricated. At the same time, the oil pump control system can adjust the internal oil pressure and temperature through the built-in temperature control valve to meet the needs of the system.
2. Air circulation system
When the compressor is working, the air is sucked through the self-cleaning air filter, and the filter is automatically cleaned by PLC. The air enters the first stage compression after the automatic adjustment of the inlet guide vane. The gas temperature after the first stage compression is higher, and then enters the intercooler for cooling (inside the water pipe, outside the gas pipe, and the water flow of the intercooler is required to be 110m / h), and then enters the second stage compression system, In order to prevent the gas in the system from pouring into the compression chamber (to avoid starting under pressure), a suspended full open check valve is installed in the exhaust pipe of the compressor. The gas discharged from the compressor pushes the check valve to enter the exhaust muffler, then enters the primary aftercooler, the secondary aftercooler, and then enters the main exhaust pipe.
3. Water circulation system
The cooling water enters the intercooler of the air compressor through the pipe to cool the gas discharged from the primary compression, and then enters the aftercooler to cool the exhaust gas. The other cooling water inlet pipe passes through two groups of heat exchangers on the upper part of the main motor to cool the motor winding, and the other way to cool the oil cooler.
4. Distribution system
The air compressor is 2000kW high-voltage motor (10kV), which adopts full voltage starting. The control cabinet is indoor AC and metal armored draw out switchgear. The switchgear is composed of two parts: fixed cabinet and draw out parts, namely handcart. It realizes the purpose of control, protection and monitoring, and has "five prevention" function.
5. Screen protection system
The central signal device is divided into accident signal and warning signal. The main task of the accident signal is to send out the sound signal in time when the circuit breaker trips, and make the corresponding circuit breaker light position signal flash. The main task of the warning signal is to send out the sound signal instantaneously or delayed when the abnormal phenomenon occurs in the running equipment, and make the light plate show the content of the abnormal phenomenon.
6. DC power supply system
Pz32 series full-automatic maintenance free DC power supply equipment for lead-acid battery is composed of charging device panel, DC feed panel and battery. It has the functions of automatic current stabilization, automatic voltage stabilization and automatic voltage regulation. It provides power for central signal panel and high-voltage control system.
7. DTC control system
The DTC control panel is the "brain" of the air compressor. The values of various field sensors are finally summarized to the DTC control panel. Various operating parameters are displayed on the DTC control panel, and the operating status of various parts of the air compressor is monitored. When some parameters exceed the allowable range, the DTC will send out corresponding alarms or automatically stop the air compressor.
The motor directly drives the compressor, so that the crankshaft rotating motion, drive the connecting rod to make the piston reciprocating motion, resulting in the change of cylinder volume. Due to the change of pressure in the cylinder, through the inlet valve to make the air through the air filter (silencer) into the cylinder, in the compression stroke, due to the cylinder volume reduction, the role of compressed air through the exhaust valve, the exhaust pipe, one-way valve (check valve) to storage tanks, when the exhaust pressure to achieve the rated pressure of 0.7 MPa is controlled by a pressure switch and automatic stop. When the pressure of the gas storage tank drops to 0.5-0.6Mpa, the pressure switch automatically starts the connection .
The air compressor is to provide air power, is the core equipment of the pneumatic system, the main body of the electromechanical air source device, it is the original movement (usually motor or diesel engine) of the mechanical energy into the gas pressure energy device, is the pressure of compressed air generating device.
a. Traditional aerodynamic: pneumatic tools, rock drill, pneumatic pick, pneumatic wrench, pneumatic sandblasting
b. Instrument control and automation devices, such as tool change of machining center, etc.
c. Vehicle braking, door and window opening and closing
d. Compressed air is used to blow weft instead of shuttle in air-jet loom
e. In food and pharmaceutical industry, the slurry is stirred by compressed air
f. Starting of large marine diesel engine
g. Wind tunnel test, underground passage ventilation, metal smelting
h. Oil well fracturing
i. Coal mining by high pressure air blasting
j. Weapon system, missile launch, torpedo launch
k. Submarine sinking and floating, sunken ship salvage, submarine oil exploration, hovercraft
l. Tire inflation
n. Bottle blowing machine
o. Air separation industry
p. Industrial control power (driving cylinder, pneumatic components)
q. Produce high pressure air for cooling and drying of machined parts