Mitsubishi Denki Kabushiki Kaisha

Tsutomu Inaba

Tadashi Kimura

Masahiro Sugihara

Toshiyuki Nakamura

Norihide Kobayashi

Etsuo Morishita

Masayuki Kakuda

Masahiko Oide

Tetsuzo Matsugi

Yasuyuki Suzuki

Hiromu Narumiya

A scroll type compressor, wherein the oil feeding passage of the thrust bearing to be interposed between the orbiting scroll member and the bearing support is so constructed as to having its terminal part within a plane of the thrust bearing, and a part of each of the passages is made to open at a position where it is intermittently communicating with the guide grooves of the orbiting scroll member.

Scroll compressor with oil feeding passages in thrust bearing

A scroll compressor comprises a driving scroll, a driven scroll combined with the driving scroll to be driven by the same through the mutual contact of the wrap plates of the both scrolls, a movable bearing support held in a sealing container so as to be movable in the axial and radial directions of the container. The movable bearing support supports the driven scroll so that the driven scroll is pushed in the radial direction of the container, whereby gaps formed between the wrap plates of the driving and driven scrolls can be avoided.

Scroll compressor with members pressing rotating scrolls radially and

A scroll compressor comprising a driving scroll and a driven scroll which is combined with the driving scroll and is driven by the driving scroll through an Oldham's coupling, a partition plate fixed to a container for housing the structural elements such as scrolls and having a supporting pin provided at a position near the inner wall of the container, a movable bearing support which is placed below the partition plate and is engaged with the supporting pin so as to be swingable around the supporting pin, and which supports the driven scroll through a bearing, and a rotation controlling structure which causes a swinging movement of the movable bearing support around the supporting pin along with a driven scroll whereby the distance between the axial centers of said driving and driven scrolls is changed.

Scroll compressor with control of distance between driving and driven

A scroll-type compressor is disclosed which has a novel thrust bearing for supporting an orbiting scroll. The thrust bearing is annular and is supported by a bearing support frame which has a plurality of oil return holes formed therein. The diameter of the thrust bearing is smaller than the diameter of the orbiting scroll and of an Oldham coupling which guides the orbiting scroll. The thrust bearing has a plurality of oil passageways for lubricating oil formed therein whose inner ends open onto the central hole and whose outer ends communicate with the oil return holes and do not extend to the outer periphery of the bearing. The oil passageways are always covered by the orbiting scroll. In one form of the invention, the oil passageways are in the form of grooves formed in the upper surface of the bearing and through holes which communicate between the outer ends of the grooves and the oil return holes. In another form of the invention, the oil passageways are slits formed through the depth of the bearing. In another form of the invention, the oil passageways are a combination of slits formed through the depth of the bearing, through holes which communicate with the oil return holes, and grooves formed in the upper surface of the bearing which extend between the slits and the through holes.

Scroll-type compressor with oil passageway in thrust bearing

A scroll-type fluid transferring machine has stationary and oscillatable scroll members, each being provided with a base plate and a wrap plate projecting from a surface of the base plate, which are combined in such a manner that a plurality of compression chambers are formed by the surfaces of the base plates and wrap plates and a fluid contained in the chambers is transferred, compressed or expanded by the revolution of the oscillatable scroll member. The scroll-type fluid transferring machine comprises a first fine adjustment element having the same spiral form as the wrap plate of the stationary scroll member; a second fine adjustment element having the same spiral form as the wrap plate of the oscillatable scroll member; a first guide groove having the same spiral form as the first fine adjustment element and being formed in the top end surface of the wrap plate of the stationary scroll member; a second guide groove having the same spiral form as the second fine adjustment element and being formed in the top end surface of the wrap plate of the oscillatable scroll member, wherein the first and second fine adjustment elements are respectively received in the first and second guide grooves so that gaps between the end surface of the wrap plates and the surface of the base plates facing the wrap plates are finely adjusted.

Scroll-type fluid transferring machine with gap adjustment between

A scroll-type fluid transferring machine of an improved construction, in which the bottom surface of the base plate of the orbiting scroll member and the bearing surface of the thrust bearing are well adapted even under a thrusting force during compression of the operating fluid, such scroll-type fluid transferring machine having its feature such that the surface of the thrust bearing to support the base plate of the orbiting scroll member, or the surface of the base plate of the scroll member supported by the thrust bearing is slanted in the radial direction so as to form the surface thereof in a center-concaved shape, wherein the inner peripheral side is concaved with respect to the outer peripheral side at a very small distance in the axial direction, or that an axial projection which is concentric with the thrust bearing and has a narrow width in the radial direction is provided between the opposed surfaces of the thrust bearing and the bearing frame in the vicinity of the center part in the radial direction between the inner peripheral side and the outer peripheral side of the thrust bearing, and further space gaps are provided between the mutually opposed surfaces at the inner peripheral side and the outer peripheral side of the projection.

Scroll-type fluid transferring machine with deformable thrust bearing

A scroll compressor is provided with a main shaft to drive an orbiting scroll whereby fluid in a compression chamber which is formed by combining a stationary scroll with the orbiting scroll is compressed and then is discharged from the scroll compressor. To prevent a refrigerant gas in an eccetric recess formed in the main shaft from mixing with a lubricating oil, a conduit is formed in the main shaft to communicate the eccentric recess with a space between the lower part of the orbiting scroll and the upper part of the main shaft.

Scroll compressor with pressure-equalizing passage and gas vent conduit

In a scroll type compressor, the shaft of a driven scroll is rotatably supported in a sealing container so that the axis of rotation of the driven scroll shaft is deviated from the axis of rotation of a driving scroll; the wrap plates of the driving and driven scrolls are mutually combined with each other so that the parts of the side surface of the wrap plates come in contact with each other to form a compression chamber; and the driven scroll is directly driven by the driving scroll in synchronism therewith, whereby the function of compression of a fluid is obtainable during the movement of the compression chamber toward the centers of the driving and driven scrolls.

Scroll compressor with driving and driven scrolls

A scroll-type fluid transferring machine of an improved construction, in which the bottom surface of the base plate of the orbiting scroll member and the bearing surface of the thrust bearing are well adapted even under a thrusting force during compression of the operating fluid, such scroll-type fluid transferring machine having a feature such that the surface of the thrust bearing to support the base plate of the orbiting scroll member, or the surface of the base plate of the scroll member supported by the thrust bearing is slanted in the radial direction so as to form the surface thereof in a center-concaved shape, wherein the inner peripheral side is concave with respect to the outer peripheral side at a very small distance in the axial direction, or that an axial projection which is concentric with the thrust bearing and has a narrow width in the radial direction is provided between the opposed surfaces of the thrust bearing and the bearing frame in the vicinity of the center part in the radial direction between the inner peripheral side and the outer peripheral side of the thrust bearing, and further space gaps are provided between the mutually opposed surfaces at the inner peripheral side and the outer peripheral side of the projection.

Scroll-type fluid transferring machine with slanted thrust bearing

A scroll compressor comprises a driving scroll and a driven scroll which is combined with the driving scroll and is driven by the driving scroll through an Oldham's coupling, a partition plate fixed to a container for housing the structural elements such as scrolls and having a supporting pin provided at a position near the inner wall of the container, a movable bearing support which is placed below the partition plate and is engaged with the supporting pin so as to be swingable around the supporting pin, and which supports the driven scroll through a bearing, and a rotation controlling means which causes a swinging movement of the moveable bearing support around the supporting pin along with the driven scroll whereby the distance between the axial centers of said driving and driven scrolls is changed.

An improved scroll type compressor which is provided with a thrust bearing of high operational reliability, wherein the thrust bearing has a plurality of oil-feeding grooves in the spiral form formed in the surface part of the bearing so as to prevent it from seizure or wear.

Scroll type compressor with spiral oil feeding grooves in thrust bearing

A scroll-type apparatus having an improved radial seal and a method for the assembly thereof is disclosed. The spiral wrap of a moving scroll and a stationary scroll are provided with gap adjusting means for providing a gap of a desired size between the top surface of the spiral wrap of each scroll and the top surface of the base plate of the opposing scroll. The gap adjustment means comprises a spiral-shaped elastic element which fits into a groove formed in the top surface of a spiral wrap or on top of a protrusion formed on the top surface of the spiral wrap, to form a nonpressurized seal. The elastic element is supported by the spiral wrap by friction, bonding, or solvent welding.

Method for the assembly of a scroll-type apparatus

A scroll-type apparatus having a main journal bearing which journals the drive shaft of the apparatus and is capable of pivoting by small angles with two degrees of freedom. The main journal bearing comprises three or more arcuate pads whose inner surfaces journal the drive shaft and which are pivotably supported by a stationary main bearing housing. In a preferred embodiment, each of the pads has a spherical protrusion and two rotation-preventing pins secured to its back surface. The protrusions contact the inner surface of the main bearing housing and pivotably support the pads, while the rotation-preventing pins are inserted into grooves formed on the inner surface of the main bearing housing. When a load is applied to the drive shaft causing it to tilt, the pads of the main journal bearing can tilt along with the drive shaft by pivoting about the points of contact between the spherical protrusions and the inner surface of the main bearing housing, thereby preventing edge loading of the main journal bearing.

Scroll-type apparatus having a pivoting main journal bearing

A scroll-type fluid transferring machine comprises a stationary scroll member and an oscillatable scroll member, each of which has a spiral wrap of an involute curve or other curves projecting from a base plate and which cooperate to form a compression chamber between the spiral wraps and the base plates by mutually fitting one into the other, an oscillatable scroll shaft provided on the surface of the base plate at the position opposite the spiral wrap of the oscillatable scroll member, a crank shaft having an eccentric recess having its axis which is shifted by a predetermined distance from the axis of the crank shaft, wherein a cylindrical bush having the coaxial outer and inner circles is loosely fitted in the eccentric recess of the crank shaft with a gap between the outer circumference of the bush and the inner wall of said eccentric recess, and the shaft of the oscillatable scroll member is fitted in the inner circumference of the bush in a freely rotatable manner.

Growing community of inventors

Wakayama, Japan

Tsutomu Inaba