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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYasuyuki Suzuki, Toshiyuki Nakamura, Takahiro Maeda
Estimating the term…
The present invention relates to a scroll fluid machine in use for compressors, expanders and the like, comprising spiral fine regulation elements having the same curvature as each spiral side plate of a fixed scroll and an orbiting scroll and grooves provided in an end face of each spiral side plate of both scrolls and provided with a stepped portion formed halfway thereof for being forced thereinto said spiral fine regulation elements, and axial gap between the end face of each spiral side plate of the fixed scroll and the orbiting scroll and the opposite bottom face of each bed plate being finely regulated by setting depths of putting the fine regulation elements in the grooves, whereby preventing a fluid from leaking in the operation thereof.
A scroll fluid machine, in which a plaurlity of chambers are formed between spiral side plates and bed plates by combining a fixed scroll with an orbiting scroll each being formed of the spiral side plate, standing on the bed plate, and a fluid taken in said chambers is compressed or expanded by rotating the orbiting scroll, characterized by being provided with spiral fine regulation elements having the same curvature as each spiral side plate of said both scrolls and grooves formed along end faces of the spiral side plates of said both scrolls, said grooves being provided with a stepped portion formed halfway in the direction of depth thereof, an opened portion of said grooves above the stepped portion having a width larger than that of a bottom portion of said grooves below the stepped portion thereof, said spiral fine regulation elements being forced into said grooves, and wherein means are provided for maintaining said spiral fine regulation elements under a stable fixed condition in said grooves.
A scroll fluid machine as set forth inclaim 16, in which said fine regulation elements are made of flexible materials.
Dependencies are inferred from the claim text.
No related US applications are recorded in the indexed filing history.
Drawings are temporarily unavailable. Open the PDF at USPTO
Both members having co-operating elements in spiral form: where only one member is moving
Sealing arrangements in rotary-piston machines or engines: axially-movable sealings for working fluids
Rotary-piston or oscillating-piston machines or engines
Term ended 5 Nov 2006 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to a scroll fluid machine used for compressors, such as air compressors and refrigerant compressors, pumps, expanders or the like, in particular to a gap-fine regulation mechanism of a scroll fluid machine.
2. Description of the Prior Art
FIG. 1 is a diagram showing an operation principle of a scroll fluid machine;
FIG. 2 is a sectional view showing a conventional scroll fluid machine;
FIG. 3 is a sectional view showing main parts of a conventional gap fine-regulation mechanism;
The preferred embodiments of the present invention are described below with reference to the drawings. Referring now to FIG. 7, reference numeral 1 designates a fixed scroll, 2 designating an orbiting scroll, the fixed scroll 1 being provided with a discharge port 1a formed in the central portion thereof, and the fixed scroll 1 being provided with a suction port 1b formed in a circumferential wall 103 thereof. In addition, the fixed scroll 1 comprises a disk-shaped bed plate 102 and a spiral side plate 101 integrally formed with the bed plate 102 while the orbiting scroll 2 comprises a disk-shaped bed plate 202 and a spiral side plate 201 integrally formed with the bed plate 202 similarly to the fixed scroll 1, both scrolls 1, 2 being engaged with each other to form a compression chamber P surrounded by the bed plates 102, 202 and the spiral side plates 101, 201. Of a plurality of formed compression chamber P, the central compression chamber having the highest pressure communicates with the discharge port 1a.
Said spiral side plate 101, 201 is provided with a groove 5, 5 as a guide member formed along the longitudinal direction of spirals except for the inner end portion and outer end portions in the spiral direction on each of end faces 101a, 201a thereof, a fine-regulation element (hereinafter merely referred to as an element) 6, 6 being put in each of the grooves 5, 5, respectively. Said elements 6, 6 are forced into the grooves 5, 5 so that a part of both side faces thereof may be completely adhered to the inside face of the grooves 5, 5 in the longitudinal direction of spirals.
The bed plate 202 of the orbiting scroll 2 is provided with an axis 203 vertical to a back face 202b of the bed plate 202 and parallel to a main shaft 3, which will be described later, for rotating the orbiting scroll 2 at the central portion of the back face 202b thereof. In addition, the main shaft 3 is provided with an eccentric hole 3a having an axis shaft line parallel to an axis shaft line (a center of rotation) thereof formed on the upper end face thereof. An almost cylindrical eccentric bush 301 is rotatably put in the eccentric hole 3a for imparting a pressing force to the orbiting scroll 2 so that even when the spiral side plates 101, 201 are worn, the side faces of both side plates 101, 201 may be brought into contact with each other always at a portion B. Said eccentric bush 301 is eccentric relative to an outside circumference thereof, an axis shaft line thereof being provided with an eccentric hole 301a parallel to an axis shaft line of the main shaft 3, said axis 203 being rotatably inserted in this eccentric hole 301a.