Injection screw compressor
The motor driven oil injected screw compressor is a very wide range of applications. Its main feature is the only simple load bearing can provide long life, low maintenance cost, and a wide range of compressor pressure.
The injection screw compressor is a new type compressor, the gas to be compressed is sucked into the compression chamber, a compression chamber is then closed and gradually narrowing by compressed air, compressed to a predetermined pressure after discharge.
Compression principle
Through the air inlet into the compression chamber before the screw compressor, in the body, is arranged parallel to a pair of mutually meshed helical rotor, the rotor has a generally convex tooth section of outer circle, called Yang or male screw rotor. The rotor pitch circle has a concave tooth, called Yin Yin or Yang general rotor rotor, rotor is connected with the motor, the rotor drives the rotation of the rotor by Yang Yin, finally realize axial positioning of bearing on the rotor, and the axial force of the compressor. Cylindrical roller bearings at both ends of the rotor. The rotor radial positioning, and bear radial force in a compressor.
At both ends of the compressor body, the orifice are respectively provided with certain shape and size. A getter, known as the air inlet; the other one is for exhaust vent, called.
Working principle: screw compressor working cycle can be divided into the intake, compression and exhaust three processes. With the rotation of the rotor, each pair of meshing teeth have completed the same work cycle.
1. intake process: when the rotor rotates, the tooth groove space rotor to intake openings in the end wall, the largest space, the space and the air inlet of the rotor tooth groove is communicated, because the gas in the exhaust channel of the tooth is discharged completely, the exhaust is completed, the tooth groove in the vacuum state, when the inlet, the outside world the gas is inhaled, along the tooth grooves axially into the rotor. When the gas filled the entire tooth groove, the rotor inlet side end away from the shell in the gas inlet, the tooth groove is closed.
2. compression process: Yin and Yang in the suction end of the rotor, the rotor tip and the casing will be closed, the gas in the drain ditch without tooth. The meshing surface moves to the exhaust end. The space between the teeth meshing with the exhaust port gradually small, gas is compressed pressure to improve the tooth grooves.
3. exhaust process: when engaging the end face of the rotor to casing and an air outlet is communicated, compressed gas discharge, to the exhaust end until the meshing teeth and teeth, the tooth groove space meshing rotor surface and the casing outlet is 0, complete exhaust process, at the same time the tooth groove length between the rotor and the casing inlet and the meshing surface is the longest, the intake process again.
VMC screw compressor head with high profile VMC design, screw is 4 to 5, and the use of international brand bearing longevity.
Intake valve
The intake valve controls the screw compressor air intake. By opening and closing the air inlet, the air adjust screw compressor. When the pressure reaches the set pressure of the compressor, the compressor is switched to the unloading mode: the intake valve is almost completely closed air inlet. At this time, no more air suction and compression, so the compressor is idle, the power consumption is greatly reduced.
Most of the unloading valve is loaded or unloaded form, can be fully opened can completely shut down. In unloading condition, the unloading valve is closed, the compressor consumes power rating of 30%. There are other forms of continuous intake or adjust the air condition. In this case, the compressor can work in any state before 0-100%. This model in the fixed compressor is not often used this model in diesel engine driven common compressor.
VMC to the intake valve is known for its professional design in the world compressor field, relying on several decades of experience in design and production as well as the European patent, can provide the best solution for the user of the air control compressor control.
lubrication
Lubricating oil by mineral oil with additives to improve the separation efficiency and prolong the service life of the air and oil, prevent contamination and prevent foam and emulsion. The use of synthetic oil would be better. VMC has been suggested to use famous brand of lubricating oil, to avoid the inconvenience and loss of lubricating oil caused by using low cost. A mixture of compressed air and lubricating oil from the compressor, through the oil separator after most of the lubricating oil separated from compressed air. The air is separated from the liquid by changing the direction and speed to achieve. After the compressed mixture of oil and gas in the air through the filter of the remaining, only a very small part of the residual minimum pressure valve and exhaust valve, usually combined together by separating the elements prevent excessive speed, until the system pressure reaches can start pressure. Most of the oil injected screw compressor through the system pressure of lubricating oil cycle, oil and gas mixture after the compressor head out of the exhaust port, through filtering and cooling again after the circulation to the compressor cavity.
cooling
Enter the lubricating oil temperature compression chamber is generally controlled at 80-90 DEG C, which directly or indirectly regulate the temperature of exhaust gas. The temperature must be kept above the dew point temperature, to avoid moisture condensation of oil. The temperature control valve to control all or part of the lubricating oil circulation to the cooler, so the compressor can keep the temperature needed to work in a large range of ambient temperature. VMC in pressure