Stepless air volume control for reciprocating compressors
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Question: What is the working principle of stepless air volume control in reciprocating compressors?
Take a look at the principles described in the book regarding the load adjustment of the press at 0%, 25%, 50%, and 75% levels;~~~ Continuous adjustment involves changing from a state where there is either no contact or full contact to a state where the stroke can be adjusted.........
Load adjustment of 0%~25%~50%~75% refers to the number of suction valves that open during the compression to exhaust phase (in simple terms); stepless air volume control means that the number of suction valves that open is determined based on the piston’s stroke, with the piston’s position being measured by the flywheel.
Everything said upstairs is correct. I’d like to add that the variable capacity control system allows the compressor’s load to be adjusted continuously from 0% to 100%. By setting the compressor’s discharge pressure, the system forces the intake valve to open during the piston compression process (the timing for opening the valve is determined by the system). Some of the fluid returns through the intake valve back into the intake pipe, so that the compressor does not do any work during the time the valve is open; it only compresses the fluid that can reach the desired discharge pressure. This enables both the intake and exhaust valves to be fully closed, thereby reducing the compressor’s energy consumption. However, this may lead to increased vibration in the intake pipes or within the compressor itself.
The infinite air volume refers to the control of the air intake amount by the air valve
Variable air volume is achieved by detecting the flywheel phase to determine the piston’s stroke; the piston does work during part of its stroke, while during the remaining portion it pushes open the inlet valve without doing any work, thus enabling the desired adjustment of air volume.
0%~100% is theoretical; the reverse angle of the compressor also needs to be taken into account
Correct! Controlling the air intake volume is the only way to achieve 0-100% stepless adjustment of a reciprocating compressor without increasing power consumption. This device is an automatic air valve unloader; backflow regulation is energy-intensive, while variable-frequency regulation cannot achieve full flow rate