Working principle of reciprocating compressor_Working process of reciprocating compressor

Working principle of reciprocating compressor_Working process of reciprocating compressor Working principle of reciprocating compressor 　　 Relies on periodic changes in the working volume of the cylinder to compress the gas to achieve the purpose of increasing the working pressure. (The reciprocating movement of the piston in the cylinder causes the decompression to suck the gas, and then compress the gas to a certain pressure and send it out.) The working principle of the piston compressor. 　　 Compressor is a machine used to compress low-pressure gas to high pressure. When accomplishing this task, it adopts successive multi-stage compression. Each stage cylinder has the same intake, compression and exhaust process.

1. The theoretical cycle of the compressor The theoretical circulation of gas in the cylinder has the following characteristics: the compressor does not have a pressure loss at the intake and exhaust valves during intake and exhaust, the pressure at the intake and exhaust process is kept constant, and the compression process index is a The value is fixed, so there is no hot foot exchange between the gas and the cylinder wall during compression. There is no clearance volume in the cylinder to store a small part of high-pressure gas, and all the gas can be discharged outside the cylinder. 　　 2. The actual circulation of the compressor 　　 has a clearance volume. Under the same pressure ratio and expansion index, the relative clearance volume increases and the volume decreases. Generally, in order to improve the volumetric efficiency, the clearance volume should be reduced as much as possible. 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. 　　 1、Expansion 　　When the piston moves to the left, the volume of the cylinder increases and the pressure drops, and the residual air that originally remained in the cylinder expands continuously. 　　 2. Inhalation 　　 When the pressure drops slightly below the pressure of the gas in the intake pipe, the gas in the intake pipe pushes the suction valve into 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 the piston is moved to the right, the volume of the cylinder gradually decreases, so that the process of compressing the gas begins. Because the suction valve has a check function, the gas in the cylinder cannot be poured back into 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 increase. 　　 4. Discharge As the piston moves to the right, when the pressure of the compressed gas rises slightly higher than the gas pressure in the outlet pipe, the gas in the cylinder will open the spring of the exhaust valve into the outlet pipe and continue to discharge until the piston moves 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.

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