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US 4,950,135 AGranted
Piezoelectric powered scroll compressor
AssigneeHitachi, Ltd.
InventorsKenji Tojo, Shigeru Machida, Kenji Mori
Life of this patent
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AssigneeHitachi, Ltd.
InventorsKenji Tojo, Shigeru Machida, Kenji Mori
Estimating the term…
A 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.
A scroll-type fluid machine, having a frame, a stationary scroll member attached to said frame and an orbiting scroll member, each scroll member having an end plate and a spiral wrap projecting axially from one side of said end plate, said stationary scroll member and said orbiting scroll member being assembled with said wraps of both scroll members meshing with each other, said orbiting scroll member orbiting around an axis of said stationary scroll member without rotating on its own axis so that volumes of closed chambers defined by the end plates and wraps of both scroll members progressively vary to transport a fluid, said scroll-type fluid machine further comprising:
A scroll-type fluid machine, having a stationary scroll member and an orbiting scroll member, each scroll member having an end plate and a spiral wrap projecting axially from one side of said end plate, said stationary scroll member and said orbiting scroll member being assembled with said wraps of both scroll members meshing with each other, said orbiting scroll member orbiting around an axis of said stationary scroll member without rotating on its own axis so that volumes of closed chambers defined by the end plates and wraps of both scroll members progressively vary to transport a fluid, said scroll-type fluid machine comprising:
A scroll-type fluid machine, comprising a stationary scroll member and an orbiting scroll member, each scroll member having an end plate and a spiral wrap projecting axially from one side of said end plate, said stationary scroll member and said orbiting scroll member being assembled with said wraps of both scroll members meshing with each other, said orbiting scroll member orbiting around an axis of said stationary scroll member without rotating on its own axis so that volumes of closed chambers defined by the end plates and wraps of both scroll members progressively vary to transport a fluid, said machine further comprising driving means for the orbiting motion of said orbiting scroll member which are piezoelectric motors including piezoelectric elements, said piezoelectric motors confining the axial movement of said orbiting scroll member.
A scroll-type fluid machine, having a stationary scroll member and an orbiting scroll member, each scroll member having an end plate and a spiral wrap whose spiral shape is an involute or a similar curve and which projects axially from one side of said end plate, said stationary scroll member and said orbiting scroll member being assembled with said wraps of both scroll members meshing with each other and with said end plates parallel to each other, said orbiting scroll member orbiting around an axis of said stationary scroll member without rotating on its own axis so that volumes of closed chambers defined by the end plates and wraps of both scroll members progressively vary to transport a fluid, said scroll-type fluid machine further having a stationary member, said stationary scroll member being fixed at its peripheral portion to the stationary member, said orbiting scroll member being supported on said stationary member and moving on a plane parallel to said end plates, said scroll-type fluid machine further having a plurality of linear actuators arranged between said stationary member and the rear surface of said orbiting scroll member, said rear surface being the reverse surface of the surface facing said stationary scroll member, radial displacements produced by said linear actuators and oriented toward the center of said stationary scroll member being transmitted to said rear surface of said orbiting scroll member, said linear actuators being energized by A.C. voltages whose phases are different from each other, the differences in phase corresponding to the angles between the axes of said displacements of said linear actuators so that said orbiting scroll member orbits without rotating on its own axis.
Dependencies are inferred from the claim text.