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US 2003/0194340 A1Published application
Scroll type fluid displacement apparatus with fully compliant floating scrolls
AssigneeNone recorded
InventorShimao Ni
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AssigneeNone recorded
InventorShimao Ni
Estimating the term…
The invention includes a “floating scroll” mechanism for scroll type fluid displacement apparatus. The dual orbiting scroll has spiral vanes on both sides of the end plate. In a floating scroll, the orbiting scroll is dynamically well balanced, axially and radially. The scrolls are fully or semi- axially and radially compliant for maintaining minimum contacting forces between components, hence achieving good sealing for high speed, high efficiency, low friction wear and power loss. A crank shaft-sliding knuckle and/or peripheral crank handles-sliding knuckle mechanism provide the dual orbiting scroll with radial compliant capability. A synchronizer is used to synchronize the orientation of the crank handles to avoid the mechanism from jamming during operation and start up.
A positive fluid displacement apparatus, comprising:
A positive fluid displacement apparatus, comprising:
A positive fluid displacement apparatus, comprising:
A positive fluid displacement apparatus, comprising in combination
A positive fluid displacement apparatus, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions: for eccentric movement
Using cranks, universal joints or similar elements: with only rolling movement
Where only one member is moving: with symmetrical double wraps
Details concerning the involute wraps or their base, e.g. geometry: details concerning the base
Term end not estimated
This invention relates to a scroll-type positive fluid displacement apparatus and more particularly to a scroll-type apparatus having a fully compliant, i.e. axially and radially compliant, floating scroll mechanism.
There is known in the art a class of devices generally referred to as “scroll” pumps, compressors and expanders, wherein two interfitting spiroidal or involute spiral elements are conjugate to each other and are mounted on separate end plates forming what may be termed as fixed and orbiting scrolls. These elements are interfitted to form line contacts between spiral elements.
A pair of line contacts and the surfaces of end plates form at least one sealed off pocket. When one scroll, i.e. the orbiting scroll, makes relative orbiting motion, i.e. circular translation, with respect to the other, the line contacts on the spiral walls move along the walls and thus changes the volume of the sealed off pocket. The volume change of the pocket will expand or compress the fluid in the pocket, depending on the direction of the orbiting motion.
For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in connection with the accompanying drawings in which:
FIG. 1 is a cross-sectional view of a fully compliant floating scroll compressor in accordance with this invention;
FIG. 2 is a traverse sectional view of the orbiting scroll member with a radial compliant mechanism of the present invention of FIG. 1 taken along line 2-2;
Referring to FIG. 1, a scroll-type air compressor designed in accordance with the present invention is shown. The compressor unit 10 includes a front housing 20 and a rear housing 21. A main shaft 40 rotates along its axis S1-S1 when supported and driven by an external means (not shown). A drive pin 42 extrudes from the front end of main shaft 40, and the central axis of drive pin 42, S2-S2, is offset from the main shaft axis, S1-S1, by a distance equal to the orbiting radius Ror of the orbiting scroll member 60. The orbiting radius is the radius of the orbiting circle, which is traversed by the orbiting scroll member 60 as it orbits relative to the first fixed scroll member 50 and the second fixed scroll member 70.
The first fixed scroll member 50 (also called front fixed scroll) has an end plate 51 from which a scroll element 52 extends. There is a hole 53 in the center of the end plate 51 to allow the main shaft 40 to pass through to drive the orbiting scroll 60.
The orbiting scroll member 60 includes circular end plates 61 and 61′, scroll elements 62 and 62′ affixed to and extending from opposite sides of the end plates 61 and 61′, respectively, and orbiting bearing hubs 63 and 63′ affixed to and extending in the central portion of the end plates 61 and 61′, respectively. For convenience, the part that includes end plate 61, element 62 and hub 63 is designated as the front orbiting scroll, and end plate 61′, element 62′ and hub 63′ as the rear orbiting scroll. Orbiting scroll 60, containing front and rear orbiting scrolls arranged back to back, is called dual scroll. The front and rear orbiting scrolls of the dual scroll orbit together and can make radial movement relative to each other during operation.