Compression ratio of American Copeland compressor

Compression ratio of American Copeland compressor The compression ratio theoretically refers to the ratio of absolute exhaust pressure to absolute suction pressure. For example, the absolute pressure of the exhaust is 20bar, and the absolute pressure of the suction is 5bar, then the compression ratio is 4. There is also a volume ratio, that is, the ratio of the amount of exhaust gas per revolution to the volume of the suction chamber. The compression ratio mentioned here refers to the ratio of pressure. For the American Copeland compressor, the compression ratio is a key concept to measure the compression stroke size of the compressor, and it is also a reference value for the compressor efficiency optimization point. Taking a manual compressor such as a bicycle pump, the length of the pump means different compression ratios, but it must have an optimal length, which is the most suitable for bicycle tires. The suction pressure of the pump is basically the same as the atmospheric pressure Equal, the exhaust pressure is the tire pressure required by the tire, it is a relatively stable operating condition, and it is easier to determine the compression ratio. If the pump is used to inflate the balloon, the required pressure is relatively small compared to the bicycle tire, and there will be a problem of over-compression. It means that the gas pressure in the moment before the compressor completes the exhaust is beyond the required pressure, and the compressor consumes power in vain. On the other hand, if you use a bicycle pump to inflate car tires, the same reason will occur under compression, the pressure after the completion of compression does not meet the demand, so you can only rely on repeated compression and one-way back pressure valve to achieve what you need pressure. For scroll compressors, over-compression and under-compression can occur. Compressors that use a single volume chamber controlled by back pressure to achieve the compression function, such as piston compressors, rolling rotor compressors, etc., will not experience over-compression, but will Under compression occurred. Whether it is over-compressed or under-compressed, the performance of the compressor will be lower than the optimization point to a certain extent, and the reliability will be reduced. This can also explain that many users in the current industry use scroll compressors for air conditioning as medium and high temperature cold storage. The end result is low efficiency, and the compressor is overheated and easily burned out. This is the same reason.

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