Vortex machine with continuous power regulation

Abstract

An improved continuous capacity modulation system for scroll-type compressors is disclosed in which a valve body of a solenoid valve assembly is secured to the inner wall of the hermetic shell and the actuating coil is mounted on the outer surface thereof. The actuating coil includes a plunger / valve member which cooperates with passages provided in the valve body to selectively actuate the capacity modulation arrangement utilizing compressed fluid. The construction offers the advantage that all fluid pressure lines are located within the hermetic shell and thus protected from potential damage, the solenoid coil may be easily changed / replaced to accommodate different available operating voltages and / or malfunction thereof and the system can be easily tested prior to final welding of the outer shell. The actuating coil is controlled by Pulse Width Modulation to reduce the load demand of the compressor during times when load shedding is required.

Description

technical field [0001] This invention relates generally to scroll compressors and, more particularly, to a delayed suction type continuous power modulation system for such compressors. Background technique [0002] Common summer peak demand limit controls have historically been driving demand that has lagged refrigeration compressor unloading needs. The traditional method used for unloading has the room thermostat perform an on / off duty cycle of the air conditioning system approximately every 15 minutes. Disadvantages of this approach are that the control and communication hardware costs to implement the system are higher than the savings in demand-side control, and the comfort provided by the system is reduced due to the longer shutdown cycles. Another common method is variable speed air regulation systems, these regulation systems can make the power continuously adjusted down to about 75%-80% of the power. However, not only are speed converters more expensive, but they a...

AI Technical Summary

Problems solved by technology

However, not only are speed converters more expensive, but they also reduce the quality of the power supply due to harmonic oscillations, thus losing the inherent benefit of general use

Two-stage compressors using two-speed or reversing motors are another option, but these systems have limited power because the motor has to be turned off for 1-2 minutes between speed changes to ensure reliability

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