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Capacity modulated scroll compressorRelated Patent Categories: Pumps, With Condition Responsive Pumped Fluid Control, Pressure Responsive Relief Or Bypass Valve, Rotary Expansible Chamber PumpCapacity modulated scroll compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070036661, Capacity modulated scroll compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates to capacity modulation of compressors. More particularly, the present invention relates to the capacity modulation of a scroll compressor by controlling the fluid pressure in a chamber where the fluid pressure in the chamber biases the two scrolls together. BACKGROUND AND SUMMARY OF THE INVENTION [0002] Capacity modulation is often a desirable feature to incorporate into the compressors of air conditioning and refrigeration systems in order to better accommodate the wide range of loading to which the systems may be subjected. Many different approaches have been utilized for providing this capacity modulation feature. These approaches have ranged from control of the suction inlet of the compressor to bypassing compressed discharge gas back into the suction pressure zone of the compressor. With a scroll-type compressor, capacity modulation has often been accomplished by using a delayed suction approach which comprises providing ports at various positions extending through one of the base plates which, when opened, allow the initially formed compression chambers between the intermeshing scroll wraps to communicate with the suction zone of the compressor. This delays the point at which the sealed compression chambers are formed and, thus, delays the start of compression of the suction gas. This method of capacity modulation has the effect of actually reducing the compression ratio of the compressor. While these delayed suction systems are effective at reducing the capacity of the compressor, they are only able to provide a predetermined amount of compressor unloading with the amount being determined by the position of the unloading ports along the end plate. While it is possible to provide multiple step unloading by incorporating a plurality of unloading ports at different locations, this approach becomes costly and it requires additional space to accommodate the separate controls for opening and closing each set of ports. Even when using multiple unloading ports, it is typically not possible to control the capacity of the compressor between 0% and 100% using this delayed suction technique. [0003] More recently, compressor unloading and, thus, capacity modulation has been accomplished by cyclically effecting axial or radial separation of the two scroll members for predetermined periods of time during the operating cycle of the compressor. In order to facilitate the axial unloading or axial separation of the two scroll members, a biasing chamber is formed in or adjacent one of the two scroll members; and this biasing chamber is placed in communication with a source of compressed fluid in a pressure chamber or the discharge chamber of the compressor. The fluid in the biasing chamber is cyclically released to the suction area of the compressor to facilitate the unloading of the compressor. [0004] The continued development of capacity modulated scroll compressors has been directed towards the simplification of the capacity modulation devices in order to lower the costs of the capacity modulated systems, as well as simplifying the overall manufacture, design and development of these capacity modulated systems without sacrificing performance and more preferably increasing the performance and/or reliability of the capacity modulation system. [0005] The present invention provides the art with a capacity modulated compressor which vents an existing intermediate pressurized chamber cyclically to suction to modulate the capacity of the compressor. The existing intermediate pressurized chamber is utilized in the compressor to bias the two scrolls together as well as to bias a floating seal into contact with a partition or the shell to seal a leakage passage between discharge pressure and the suction pressure zone of the compressor. A sealing system is incorporated into the scroll member defining the intermediate pressurized chamber. The sealing system incorporates a lip seal which improves both the performance and the reliability of the capacity modulation system. [0006] Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS [0007] In the drawings which illustrate the best mode presently contemplated for carrying out the present invention: [0008] FIG. 1 is a vertical section view of a scroll-type compressor incorporating a capacity modulation system in accordance with the present invention; [0009] FIG. 2 is a fragmentary view of the compressor of FIG. 1 showing the capacity modulation system shown in FIG. 1: [0010] FIG. 3 is a plan view of the compressor shown in FIG. 1 with the top portion of the outer shell removed; [0011] FIG. 4 is an enlarged view showing a portion of a modified valving ring; [0012] FIG. 5 is a perspective view of the valving ring incorporated in the compressor of FIG. 1; [0013] FIG. 6 is a fragmentary section view showing the scroll assembly forming a part of the compressor of FIG. 1; [0014] FIG. 7 is an enlarged detailed view of the actuating assembly incorporated in the compressor of FIG. 1; [0015] FIG. 8 is a perspective view of the compressor of FIG. 1 with portions of the outer shell broken away; [0016] FIG. 9 is a fragmentary section view of the compressor of FIG. 1 showing the pressurized fluid supply passages provided in the non-orbiting scroll; [0017] FIG. 10 is an enlarged section view of the solenoid valve assembly incorporated in the compressor of FIG. 1; [0018] FIG. 11 is an enlarged view of the sealing system shown in FIG. 1 with the by-pass port closed; [0019] FIG. 12 is an enlarged view of the sealing system shown in FIG. 1 with the by-pass port open; [0020] FIG. 13 is a fragmentary view of a compressor incorporating a capacity modulation system in accordance with another embodiment of the present invention; and [0021] FIG. 14 is a fragmentary section view showing the scroll assembly forming a part of the compressor of FIG. 13. Continue reading about Capacity modulated scroll compressor... Full patent description for Capacity modulated scroll compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Capacity modulated scroll compressor patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Capacity modulated scroll compressor or other areas of interest. ### Previous Patent Application: Low-profile impeller bolt Next Patent Application: Multistage motor-compressor for the compression of a fluid Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Capacity modulated scroll compressor patent info. 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