Oil circuit system of oil air compressor

The oil system of the screw compressor is equivalent to the human blood vessel, which is extremely important for the screw air compressor!

1 Principle of smooth oil system

1. Because the pressure in the oil and gas barrel is higher than that in the air intake chamber of the machine head, smooth oil passes through the temperature control valve, oil cooler and oil filter under the drive of differential pressure, and then dividends enter the machine head in two ways, one way

directly injected into the contraction chamber; the other way through the bearing group and then into the contraction chamber, in the contraction chamber mixed with air and discharged into the oil and gas barrel. Most of the oil is deposited in the oil after coarse separation.

At the lower part of the air barrel, a small amount of oil mist is deposited at the bottom of the filter element after passing through the oil and gas separation filter element, and then introduced into the air intake cavity of the engine head by the oil return pipe.

2, smooth oil in the head in addition to the smooth effect, but also from the cooling and sealing effect. The heat capacity of smooth oil is relatively large, and the heat required for each increase is far greater than that of air. Drive machine transmission

the energy entering the nose will be converted into heat. In order to control the temperature rise, smooth oil is injected into the nose and the smooth oil is used to absorb most of the heat. Smooth oil is foggy in the nose.

Cloth, the touch area with the air is very large, so the heat exchange is very fast and perfect. There is a long gap between the rotor and the casing, and leakage through the gap will not reduce the flow.

high temperature, high energy consumption and high noise. The oil film formed by the smooth oil between the relative moving parts has an excellent sealing effect, which can be useful to avoid the high-pressure gas.

Leakage on the low pressure side.

II. Clarify the function of the primary components of the oil circuit.

A, temperature control valve

the temperature control valve mainly controls the temperature of the smooth oil injected into the head to reach the exhaust temperature of the head. If the exhaust temperature of the nose is too low, the water will be separated in the oil and gas barrel to form a smooth

oil emulsification. When the cold engine starts, the temperature control valve forces the smooth oil to enter the machine head directly without passing through the oil cooler. When the oil temperature rises above 70 ℃, the temperature control valve will gradually turn on the registered oil cooler.

Road, let a part of the smooth oil through the oil cooler, and then mixed with hot oil into the nose. When the oil temperature rises to 76 ℃, the temperature control valve completely hits the channel of the registered oil cooler.

The smooth oil is cooled by the oil cooler before being sprayed into the machine head.

Because the smooth oil entering the temperature control valve is not filtered, the internal passage of the temperature control valve is messy, which is easy to cause dirt accumulation. After long-term use, the failure rate of the temperature control valve is high, which often leads to high machine

temperature maintenance. In addition, after the temperature control valve completely hits the channel of the registered oil cooler, the channel of the hot oil directly entering the machine head cannot be completely blocked, and the temperature of the smooth oil entering the machine head is always higher than that of the oil.

The cooler outlet temperature, forming the cooling power is low. Therefore, some modern models do not have a temperature control valve, and the oil temperature is controlled by controlling the start and stop of the electric fan motor. When the exhaust temperature of the nose rises

to 90 degrees Celsius, the fan start operation, if the temperature is lower than 70 degrees Celsius, the fan to stop the operation, the temperature to maintain a certain range.

After checking the four oil pipes connected with the temperature control valve, it can be judged whether the operation of the temperature control valve is normal. The four oil pipes are: oil barrel to temperature control valve, temperature control valve to oil cooler,

oil cooler to temperature control valve, temperature control valve to oil filter; normal temperature are: high, high, low, slightly higher.

B. Oil cooler

the air-cooled screw compact oil cooler is usually integrated with the aftercooler, which is made of aluminum plate fin structure and brazed in the vacuum furnace. Water-cooled screw compacters are usually shell-and-tube type.

Heat exchanger, smooth oil outside the tube activities, water in the tube activities. Water quality has a great influence on the operating conditions and life of water-cooled heat exchangers. Affected by water resources, the water-cooled screw compressor needs.

The demand is much lower than the air-cooled screw compressor. However, it is necessary to use water-cooled screw compressor in some occasions, such as dust severe occasions; There are occasions with soluble dust, such as spraying car

between; occasions that are particularly sensitive to noise.

C, oil filter

the oil filter element is often made of paper, and the filtration accuracy is between 10 microns and 15 microns. Its function is to remove the metal in the oil, dust, oxide, gum and other maintenance bearings and

the rotor is normal and smooth. The clogging of the oil filter will cause poor oil supply to the nose, which will affect the life of the bearing, resulting in high exhaust temperature and partial carbon deposition.

D. Return pipeline

in order to prevent the separated oil from entering the pipe network system with the compressed air, the smooth oil condensed in the oil and gas separation filter element must be led to the nose air intake cavity through the oil return pipe in time. To avoid downtime

the oil and gas in the opportunity head flow back through the oil return pipe, and the oil return pipe is equipped with a check valve.

There are small holes on the one-way valve to prevent a lot of compressed air from following the smooth oil through the oil return pipeline from the oil and gas tank into the air intake cavity of the nose. Save small hole diameter is usually 0.5~1mm,

very sensitive to dirt, once blocked, will cause a lot of exhaust oil. Once the exhaust oil is found to be abnormal, the temperature of the oil return pipe should be checked first. If the temperature of the oil pipe is close to normal temperature, the oil return pipe is blocked.