What is an air compressor

What is an air compressor

（2） The machine used to generate compressed air is also called compressed air machine, also called air compressor, or air compressor for short. The motor directly drives the compressor to make the crankshaft produce rotational movement, drive the connecting rod to make the piston produce reciprocating motion, and cause the cylinder volume Variety. Due to the change in the pressure in the cylinder, the air enters the cylinder through the air filter (muffler) through the intake valve. During the compression stroke, due to the reduction of the cylinder volume, the compressed air passes through the exhaust valve and passes through the exhaust pipe. The return valve (check valve) enters the gas storage tank, and when the exhaust pressure reaches the rated pressure of 0.7MPa, it is controlled by the pressure switch and automatically stops. When the pressure of the gas storage tank drops to 0.5--0.6MPa, the pressure switch is automatically connected and activated. Brief description of the working principle of air compressor 1.2 Classification of air compressors: Air compressors are divided into screw air compressors, screw air compressors are divided into single screw air compressors and twin screw air compressors, centrifugal air compressors, Piston air compressor, sliding vane air compressor, scroll air compressor, rotary vane air compressor. Introduction The twin-screw single-stage compression air compressor is composed of a pair of male and female rotors (or The screw (called screw) rotates in the cylinder, so that the air between the tooth grooves of the rotor continuously produces periodic volume changes, and the air is transported from the suction side to the output side along the rotor axis to realize the suction and compression of the screw air compressor And the whole process of exhaust. The air inlet and the air outlet of the air compressor are respectively located at both ends of the casing, and the slots of the female rotor and the teeth of the male rotor are driven to rotate by the main motor. The compressor is directly driven by the electric motor, which causes the crankshaft to rotate, and drives the connecting rod to cause the piston to reciprocate, causing the cylinder volume to change. Due to the change in the pressure in the cylinder, the air enters the cylinder through the air filter (muffler) through the intake valve. During the compression stroke, due to the reduction of the cylinder volume, the compressed air passes through the exhaust valve and passes through the exhaust pipe. The return valve (check valve) enters the gas storage tank, and when the exhaust pressure reaches the rated pressure of 0.7MPa, it is controlled by the pressure switch and automatically stops. When the pressure of the gas storage tank drops to 0.5--0.6MPa, the pressure switch is automatically connected and activated. For others, please pay attention to related entries.

（3）2. Compressor lubricant

3.2.1 Rotary vane compressors Each type of compressor has different requirements for lubricating oil. The lubricating oil function of the rotary vane compressor is to lubricate the blades that slide in and out during the compression process. Lubricating oil is also used as a sealant between the blade and the frame, making gas compression possible. Usually ISO68-150 products meet the viscosity requirements of rotary vane compressors.

（4）4.2.2 Reciprocating compressor

（5）5. Reciprocating compressor provides a large outflow pressure capacity ranging from 1bar g to 1000bar g

（6）6. (4). Oil-lubricated cylinders, crankcase parts, coils, pistons, valves and loading rods of reciprocating compressors. The crankcase components include cross head bearings, cross joints, cross head guides and crank pins. Recent refrigeration applications have shown that ISO15 lubricants with an operating viscosity of less than 10 cSt can provide suitable lubrication. However, depending on gas molecular weight and flow pressure operation, processing and classic use of hydrocarbon gas reciprocating compressors are ISO68-680 products. In most reciprocating compressors, a fluid is used as a lubricant for all components. Smaller reciprocating compressors use splash lubricant. Larger devices usually use an oil pump system to lubricate the upper crankcase components. Some large equipment uses two different lubricants, one for the cylinder and the other for other parts that require lubrication. Since cylinder lubricating oil must coexist with gas, it must be compatible with the downward flow process. Cylinder lubricating oil can be designed to provide lubrication for special gas or operating conditions.

（7）(2) 2.3 Screw compressors Filled screw compressors usually use compressed hydrocarbon and production gas, and the flow pressure ranges from 1-25 bar g

（8）(3) 5). They have many advantages, including improved compression efficiency, low outflow temperature, high reliability and less maintenance due to simple mechanical construction. Spiral gas compressors must have several functions. They lubricate the bearings, provide adequate sealing between the screw and the frame, remove heat during compression, flush out any particles in the compressor, and protect the system from corrosion. The lower viscosity limit is 10-20cSt at the oil supply temperature to the bearing and 5cSt at the outflow condition to ensure proper sealing. The viscosity of the upper lubricating oil depends on the ability to provide enough lubricating oil for the bearing. The typical upper viscosity limit is 30-100 cSt. Usually ISO68-220 lubricants meet the viscosity requirements of screw compressors. The exact viscosity grade depends on the operating conditions and air flow composition. Due to the closed loop design of the system, synthetic products are particularly suitable for screw compressors (Figure 1). The lubricating oil and compressed gas enter the separator. The separated oil passes through an oil cooler and flows back into the compressor. The degradation of the lubricant in this process can lead to compressor problems such as bearing failure, insufficient sealing or corrosion. In many applications, the use of synthetic compressor lubricants can result in effective hydrocarbon compression and gas production (7).