Compressor with unloader valve between economizer line and evaporator inlet

a compressor and unloading valve technology, which is applied in the direction of machines/engines, liquid fuel engines, lighting and heating apparatus, etc., can solve the problems of compressor damage, large refrigerant mass flow through the evaporator, etc., and achieve the effect of simplifying the compressor replacemen
US20050097908A1Inactive Publication Date: 2005-05-12CARRIER CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
CARRIER CORP
Publication Date
2005-05-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A compressor has an economizer injection line communicating into the compressor compression chambers. An unloader valve selectively communicates the economizer injection line back to a point upstream of the evaporator. When the compressor is run in unloaded mode, partially compressed refrigerant is thus returned to a point upstream of the evaporator. In unloaded mode, this results in a higher refrigerant mass flow through the evaporator, as compared to prior art where the bypassed refrigerant was returned downstream of the evaporator. This increases system efficiency by more effectively returning oil which otherwise might be left in the evaporator back to the compressor. Also, the amount of refrigerant superheat entering the compressor in unloaded operation is reduced as compared to the prior art compressor systems, wherein the bypassed refrigerant is returned directly to the compressor suction line. Reduced refrigerant superheat increases system efficiency, improves motor performance and reduces compressor discharge temperature.
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Description

BACKGROUND OF THE INVENTION

[0001] This invention relates to a unique placement for an unloader valve that is particularly beneficial to a compressor that operates in economized cycle and can also be unloaded through an intermediate economizer port.

[0002] One of the compressor types that are especially suited for this invention is a scroll compressor. Scroll compressors are becoming widely utilized in compression applications. However, scroll compressors present several design challenges. One particular design challenge is achieving reduced capacity levels when full capacity operation is not desired.

[0003] Thus, scroll compressors, as an example, have been provided with unloader bypass valves that divert a portion of the compressed refrigerant back to a compressor suction port. In this way, the mass of refrigerant being compressed is reduced. Of course, other compressor types may also have a bypass valve for similar purpose.

[0004] On the other hand, in many refrigerant compressio...

Claims

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