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Method and apparatus for variable frequency controlled compressor and fan

a variable frequency control and compressor technology, applied in lighting and heating apparatus, positive displacement liquid engines, separation processes, etc., can solve the problems of compressor operating at a higher than necessary capacity, consuming a larger amount of electrical power than necessary, and unable to meet the demand on the air system. 100% of the designed capacity,

Inactive Publication Date: 2005-04-28
WILSON JAMES J +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the demand on air heat exchanger circuit 110 decreases, refrigerant heat exchanger circuit 120 has excessive capacity that could cause the liquid condensate in dryer 100 to freeze.
The demand on the air system, however, is not always 100% of the designed capacity.
Hot gas by-pass solves the problem of providing to much cooling through refrigerant heat exchanger circuit 120, but does not solve the problem that the compressor is operating at a higher than necessary capacity and consuming a larger amount of electrical power than necessary.
These systems reduce power consumption somewhat, but cause excessive on and off cycling of compressor 122, wide fluctuations in the dew point at air outlet 118, and introduce inefficiencies associated with the heat exchange of mass media.

Method used

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  • Method and apparatus for variable frequency controlled compressor and fan
  • Method and apparatus for variable frequency controlled compressor and fan
  • Method and apparatus for variable frequency controlled compressor and fan

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Embodiment Construction

[0024] Some embodiments of the present invention are shown in FIGS. 2 through 9. FIG. 2 shows a refrigerated air dryer 200 in accordance with one possible embodiment of the present invention. Air dryer 200 includes both an air heat exchanger circuit 210 and a refrigerant heat exchanger circuit 220. Air heat exchanger circuit 210 includes an inlet 212, an air-to-air heat exchanger 214, a air-to-refrigerant heat exchanger or evaporator 216, and an air outlet 218. Air heat exchanger circuit 210 also has a conventional separator and automatic drain system (not shown) that is known in the art.

[0025] Air heat exchanger circuit 210 operates by receiving an air or gas stream at inlet 212. The air or gas stream travels through air-to-air heat exchanger 214. The air or gas stream circulates in piping 214i along the inlet side of air-to-air heat exchanges 214 to cool. After cooling, the air or gas stream exists into piping 240. The air or gas stream travels along piping 240 and enters air sid...

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Abstract

The present invention provides a variable frequency controlled refrigerant compressor in a dehydrator for compressed air or other cases. In particular, the present invention detects changes in a demand on the pneumatic air supply by monitoring a pressure of a refrigerant system associated with the air supply. Based on the changes in the refrigerant system pressure, a motor speed controller generates and sends a control signal to the variable speed compressor to adjust the speed of the variable speed compressor based on the demand in the air supply.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims is a divisional application of U.S. patent application Ser. No. 09 / 593,977 filed by James J. Wilson, Donald Neve and William B. Thomas on Jun. 3, 2000 and entitled METHOD AND APPARATUS FOR VARIABLE FREQUENCY CONTROLLED COMPRESSOR AND FAN,FIELD OF THE INVENTION [0002] This invention relates to compressor controls and more particularly to compressor controls in compressed gas systems having refrigerated dryers. BACKGROUND OF THE INVENTION [0003] Refrigerant compressors are used in a variety of systems. One type of system that uses refrigerant compressors is a compressed gas system. Compressed gas systems typically provide high volumes of dry, pressurized air or other gases to operate various items or tools (while a multitude of gases can be used, this application typically refers to air as a matter of convenience). Conventional systems dry the air using heat exchangers first to cool the air and lower the dew point o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/26F04B23/06F04B39/16F04C28/08F25B41/04F25B49/02
CPCB01D53/265F25B2700/21175F04B39/16F04B2203/0204F04B2205/01F04B2205/10F04C28/08F25B41/04F25B49/025F25B2400/075F25B2600/021F25B2600/025F25B2600/111F25B2600/2501F25B2700/1351F25B2700/1933F25B2700/21151F04B23/06F25B41/20
Inventor WILSON, JAMES J.NEVE, DONALD A.THOMAS, WILLIAM B.
Owner WILSON JAMES J
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