Refrigeration – With alternately usable energy sources
Reexamination Certificate
1999-08-24
2002-01-08
Bennett, Henry (Department: 3744)
Refrigeration
With alternately usable energy sources
C062S230000, C062S160000
Reexamination Certificate
active
06336337
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The invention relates to an innovative design of a multi-stage compressor pump driving system for air conditioning and refrigeration applications, and in particular to a multi-stage driven-type system which replaces the conventional variable frequency stage-less driving structure in order to lower costs and provide improved electromagnetic compatibility (EMC), while still providing similar functions to those of the variable frequency driving system.
(b) Description of Related Art
In recent years, variable frequency type motors have been commonly utilized in home appliances such as refrigerators and air conditioners to obtain the following effects:
1. Refrigerator: The motor is controlled by the variable frequency power source to provide variable speed operation and thereby drive the compressors at varying speeds. For example, high speed operation may be used to shorten the temperature reducing time, and low speed operation to maintain a constant temperature status, reduce noise, and save power consumption.
2. Air conditioning: The motor is also controlled by the variable frequency power source for variable speed operations, for example by driving the motor at a higher frequency to further drive the compressor for high speed operations and shorten the temperature reducing time, or by driving the motor at a lower frequency so that the temperature has less pulsation changes and to lower the noise and save power consumption.
Even though the above said functional effects are all positive, the high cost of the variable frequency type driven motor and its control devices, as well as the electromagnetic compatibility (EMC) of the variable frequency driving controller have made the circuit more complicated and costly. The high price discourages purchases, prevents people from taking advantage of all of the positive effects of power saving, convenience and low noise.
SUMMARY OF THE INVENTION
The main purpose of the invention is to provide a multi-stage compressor pump driving system for air conditioning and refrigeration applications having a lower cost and improved electromagnetic compatibility (EMC) while providing functions similar to those of the variable frequency type driving system.
REFERENCES:
patent: 3604217 (1971-09-01), Spear
patent: 3656540 (1972-04-01), Henrici
patent: 3668883 (1972-06-01), Ruff et al.
patent: 3691785 (1972-09-01), Ruff et al.
patent: 3841108 (1974-10-01), Pierrat
patent: 4151725 (1979-05-01), Kountz et al.
patent: 4364237 (1982-12-01), Cooper et al.
patent: 4494382 (1985-01-01), Raymond
Chen Yang
Yang Tai-Her
Bennett Henry
Shulman Mark
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