Compressor capacity modulation

a compressor and capacity technology, applied in the direction of pump parameters, positive displacement liquid engines, lighting and heating apparatus, etc., can solve the problem of inability to maximize the overall operating system efficiency, excess or deficient capacity, and the degree of modulation that can be achieved, so as to reduce the fluctuation of pressure in the refrigerant system, reduce the unbalanced operation of the compressor, and reduce the effect of temperature pull down
USRE40830E1Inactive Publication Date: 2009-07-07EMERSON CLIMATE TECH INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
EMERSON CLIMATE TECH INC
Publication Date
2009-07-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

A pulsed modulated capacity modulation system for refrigeration, air conditioning or other types of compressors is disclosed in which suitable valving is provided which operates to cyclically block flow of suction gas to a compressor. A control system is provided which is adapted to control both the frequency of cycling as well as the relative duration of the on and off time periods of each cycle in accordance with sensed system operating conditions so as to maximize the efficiency of the system. Preferably the cycle time will be substantially less than the time constant of the load and will enable substantially continuously variable capacity modulation from substantially zero capacity to the full capacity of the compressor. Additional controls may be incorporated to modify one or more of the motor operating parameters to improve the efficiency of the motor during periods of reduced load.
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Description

[0001] This application Ser. No. 11 / 152,834 filed Jun. 15, 2005, is a Reissue application of Ser. No. 09 / 139,865 filed Aug. 25, 1998 now U.S. Pat. No. 6,206,652 and is copending with Ser. No. 11 / 152,836 filed Jun. 15, 2005 which is also a Reissue application of Ser. No. 09 / 139,865 filed Aug. 25, 1998.BACKGROUND AND SUMMARY OF THE INVENTION

[0002] The present invention is directed to a system for modulating the capacity of a positive displacement compressor such as a refrigeration and / or air conditioning compressor and more specifically to a system incorporating a valving arrangement for cyclically blocking suction gas flow to the compressor while the compressor is continuously driven.

[0003] Capacity modulation is often a desirable feature to incorporate in refrigeration and air conditioning compressors as well as compressors for other applications in order to enable them to better accommodate the wide range of loading to which systems incorporating these compressors may be subjected. Ma...

Claims

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