Piezoelectric powered scroll compressor
Patent 4950135 Issued on August 21, 1990. Estimated Expiration Date: 
November 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesScroll machine using discharge pressure for axial sealing Scroll machine with discharge passage through orbiting scroll plate and associated lubrication system Actuator Vibration wave motor Vibration wave motor Piezoelectric motor with multilayer piezoelectric elements Patent #: 4814660 InventorsAssigneeApplicationNo. 268197 filed on 11/07/1988US Classes:417/410.5, Helical pumping member having planetary movement (e.g., scroll)310/323.02, Motor producing continual motion310/323.03, Traveling wave motor310/323.16, Eliptical motion at fixed point (i.e., walking) or Ratchet and Pawl motor310/328, With mechanical energy coupling means418/55.5With biasing means, e.g., axial or radialExaminersPrimary: Smith, Leonard E.Assistant: Scheuermann, David W. Attorney, Agent or FirmInternational ClassesH01L 041/09F04C 018/04 Foreign Application Priority Data1987-11-12 JPAbstractA scroll-type fluid machine comprises a stationary scroll member and an orbiting scroll member, each having an end plate and a spiral wrap projecting radially from the end plate, the stationary and orbiting scroll members being assembled with their wraps meshing with each other to define a plurality of compression chambers. A plurality of expanding and contracting actuators are secured on a frame and contact with the orbiting scroll member. The actuators are driven by respective A.C. voltages supplied from a driving circuit. The contact points between the actuators and the orbiting scroll member are progressively moved by expanding and contracting motions of the actuators energized by supplied voltages, the A.C. voltages for energizing the actuators being different in phase from each other so that the orbiting scroll member orbits without rotating on its own axis. The actuators also serve to confine an axial movement of the orbiting scroll member and to prevent the orbiting scroll member from disengaging from the stationary scroll member. With this arrangement, a compact, light-weight, oil-free and low-noise scroll-type fluid machine can be provided. | |
