Air conditioner manufacturers should select a compressor suitable for their requirements. For this very reason, rotary compressors are more competitively priced compared to scroll compressors. A scroll compressor uses two interleaving scrolls to pump, compress or pressurise fluids such as. Many residential central HP and A/C systems employ a scroll compressor instead of the more traditional rotary and reciprocating compressors. Lesser vibration means it can be designed into a compressor of higher capacity.įrom the cost point of view, rotary compressors have leverage because the number of parts is fewer and the working mechanism is simpler compared to scroll compressors. A scroll compressor (also called spiral compressor ), is a device for compressing air or refrigerant. Because scrolls have typically 50% less load than rotary compressors, noise and vibration issues are alleviated. Since compressors generally have a great impact on an air conditioner’s capacity, noise and vibration, a compressor should be selected considering its performance in these three areas.Īs we discussed above, a rotary compressor and a scroll compressor have different compression mechanisms, and the load varies depending on it. The biggest difference between a scroll and a rotary compressor is the mechanical structure.Ī compressor is one of the most important parts of an air conditioner, and it is very important to select a compressor that matches your system’s requirements. It can easily be observed that a rotary and a scroll compressor do not share any components except for a motor. On the other hand, a rotary compressor consists of a cylinder, an accumulator, a main bearing and a sub-bearing, a crank shaft, a roller, and a vane. The key difference between both compressors is their mechanical structure and design.Ī rotary compressor’s compression chamber is located at the bottom of the compressor, whereas in a scroll compressor, it is located at the top.Ī scroll compressor can further be divided into smaller subcomponents such as a fixed scroll, an orbiting scroll, a motor, bypass valves, a thermal protector, an internal pressure relief valve, a discharge check valve, an overload protector, etc.Ĭomponents such as a thermal protector, internal pressure relief valve, discharge check valve, and overload protector protect the compressor from potential damage. Scroll and rotary compressors are built differently and that is why they operate differently. What are the structural differences between a scroll and a rotary compressor?
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