Crankshaft Reciprocating Hydrogen Compressor

Working process of reciprocating compressor

Reciprocating compressors have cylinders, pistons and air valves. The working process of compressed gas can be divided into four processes: expansion, suction, compression and exhaust.

Example: The cylinder of a single-suction compressor. This compressor only has a suction valve and an exhaust valve in the section of the cylinder. The piston only sucks and expels air once every reciprocating.

(1) Expansion: When the piston moves to the left, the volume of the cylinder increases and the pressure drops, and the residual air originally left in the cylinder continuously expands.

(2) Inhalation: When the pressure drops slightly below the gas pressure in the intake pipe, the gas in the intake pipe pushes the intake valve open and enters the cylinder. As the piston moves to the left, the gas continues to enter the cylinder until the piston moves to the left end (also known as the left dead center).

(3) Compression: When the direction of rotation of the piston moves to the right, the volume of the cylinder gradually decreases, thus starting the process of compressing the gas. Because the suction valve has a check function, the gas in the cylinder cannot be returned to the inlet pipe, and the gas pressure in the outlet pipe is higher than the gas pressure inside the cylinder, and the gas in the cylinder cannot run out of the cylinder from the exhaust valve. The gas in the outlet pipe can not flow into the cylinder due to the check valve of the exhaust valve. Therefore, the amount of gas in the cylinder remains constant, only because the piston continues to move to the right, reducing the gas-holding space (volume) in the cylinder, so that the pressure of the gas continues to rise.

(4) Discharge: As the piston moves to the right, when the pressure of the compressed gas rises to be slightly greater than the gas pressure in the outlet pipe, the gas in the cylinder will open the spring of the discharge gas valve into the outlet pipe and continue to discharge until the piston Move to the right end (also known as the right dead center). Then, the piston began to move to the left again, repeating the above actions. The continuous reciprocating movement of the piston in the cylinder causes the cylinder to reciprocate inhale and discharge gas. Each reciprocation of the piston becomes a working cycle, and the distance traveled by the piston every time it comes back or back is called a stroke.