Invention Grant
US09139066B2 Combined operation and control of suction modulation and pulse width modulation valves 有权
吸入调制和脉宽调制阀的组合操作和控制

Combined operation and control of suction modulation and pulse width modulation valves
Abstract:
A refrigerant system is provided with a pulse width modulation suction valve and a second valve on a line that bypasses the pulse width modulation suction valve. This second valve has a variable opening. In this manner, the pressure within the compressor shell is maintained at the lowest possible level regardless of the system operating conditions, when the pulse width modulation suction valve is cycled to a closed position. Further, the second valve can continue providing capacity control, should the pulse width modulation suction valve fail.
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