Mitsubishi Denki Kabushiki Kaisha

Masahiko Oide

Toshiyuki Nakamura

Norihide Kobayashi

Hiroshi Ogawa

Takashi Yamamoto

Fumiaki Sano

Masahiro Sugihara

Tadashi Kimura

Minoru Ishii

Tsutomu Inaba

Katsuyoshi Wada

Yoshinori Shirafuji

Keiji Sakaino

Masaaki Sugawa

Tsutomi Inaba

A scroll type compressor which includes a compression unit, a crankshaft having an oil passage therein, and an electric motor stator having an oil return hole. An oil pump feeds oil into the oil passage of the crankshaft, and an oil drain tube receives return oil from the compression unit and feeds the oil to the oil return hole of the electric motor stator. The drain oil tube advantageously includes an upper nonflexible drain opening which receives oil from the compression unit. The oil then passes through a nonflexible portion which includes a bend or bent portion, and then to a flexible portion which extends from the elbow into the oil return hole of the electric motor stator.

Scroll type compressor having drain oil tube with flexible and

A scroll type compressor which includes a spacer between the fixed scroll base plate and the frame, with the spacer disposed about the orbiting scroll. The spacer is coupled to the fixed scroll and frame, and can be coupled to a center shell of the compressor, for example, by a shrinkage fit. Further, one or more bolts extend from the fixed scroll base plate through the spacer and into the frame. In addition, one or more bolts can be provided which extend from the spacer to the frame to provide for positioning of the spacer with respect to the frame.

Scroll type compressor having a spacer coupling the fixed scroll to the

A scroll type compressor having a main frame, a sub frame and a crankshaft rotatably mounted in the main frame and the sub frame via a main frame bushing and a sub frame bushing, further includes a fixed scroll and an orbiting scroll cooperable with the fixed scroll to compress gas, the orbiting scroll being drivingly mounted on the eccentric shaft portion. A barrel shaped band portion faces the crankshaft and presents a convex surface in at least one of a respective force direction of a compressive load generated in a compression chamber formed between the orbiting scroll and the fixed scroll, and a reactive force direction of a centrifugal load generated by a revolution movement of the orbiting scroll and rotary movements of upper and lower balance weights. The barrel shaped band portion is formed on the sub frame bushing.

Scroll type compressor having a convex surface on the sub frame bushing

A scroll type compressor comprising: a fixed scroll and an orbiting scroll which have their base plates provided with wraps thereon, the wraps being combined to form a compression chamber therebetween; a frame for fixedly supporting the fixed scroll, the frame having a bearing at a central portion; a crankshaft supported by the frame bearing to be rotatable, and having an electric motor rotor to give torque to the orbiting scroll; a subframe having a central portion provided with a bearing for supporting a lower end of the crankshaft; the frame having an upper annular surface and an outer peripheral wall portion extending upwardly from the upper annular surface; the orbiting scroll is disposed within the peripheral wall portion; and a plate is disposed above the upper annular surface and below the base plate of the orbiting scroll.

Scroll type compressor having a thrust plate in a frame recess

A scroll compressor features a pair of a fixed scroll and an orbiting scroll for forming a compression chamber; an orbiting bearing provided on the counter-compression chamber side of the orbiting scroll; a slider fitted to a slider fitting shaft at one end of a main shaft in such a way that the slider is slidable within a surface perpendicular to the axis of the main shaft, the slider being fitted in the orbiting bearing, a sliding direction of the slider is inclined toward the eccentric direction of the orbiting scroll by a predetermined amount in the rotational direction of the main shaft, in which a recess is provided on the groove end side in the eccentric direction of the slider. Further an elastic member is inserted in the recess between the groove end side in the eccentric direction and the slider fitting shaft while both ends of the plate are supported with respect to the recess. The slider fitting shaft is formed in an arcuate configuration as long as the contact surface between the flat plate and the slide fitting shaft is concerned, and the spiral bodies of the fixed scroll and the orbiting scroll both are made to radially contact each other in the eccentric and counter-eccentric directions of the orbiting scroll after the elastic member is deformed by a predetermined amount. During normal gas compression, the radial gap between both scrolls is reduced to zero in order to effect the compressive action without leakage, whereas during liquid compression, such a radial gap is generated so that the pressure may be relieved.

Scroll compressor with slider contacting an elastic member

A scroll type compressor comprising: a crankshaft having an eccentric shaft portion formed thereon; an orbiting scroll which is given torque by the crankshaft through the eccentric shaft portion; and bearing means for rotatably supporting the crankshaft; wherein at least one of the eccentric shaft portion and the bearing means is constituted by a rotatably engaged bushing and a curved surface portion.

Scroll type compressor having curved bearing surfaces

Scroll type compressor having curved surface portions between the shaft

A scroll type compressor comprising: a fixed scroll and an orbiting scroll which have their base plates provided with wraps thereon, the wraps being combined to form a compression chamber therebetween; a frame for fixedly supporting the fixed scroll, the frame having a bearing at a central portion; a crankshaft supported by the frame bearing to be rotatable, and having an electric motor rotor to give torque to the orbiting scroll; a subframe having a central portion provided with a bearing for supporting a lower end of the crankshaft; a center shell having a terminal member and an electric motor stator, having an inner peripheral surface formed with a stepped portion to be engaged with a stepped portion formed on an outer peripheral surface of the frame, the center shell having the frame fixed thereto by shrinkage fit at a location above or below the stepped portion of the center shell, and also having the subframe fixed to a lower end thereof; and concentric assemblage jig mounting portions formed in the frame and the subframe, respectively, to be concentric with the bearings.

Scroll type compressor with frames supporting the crankshaft

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 compressor including stationary and orbiting scrolls housed in a shell. A first frame, also housed in the shell, receives a portion of the orbiting scroll. The stationary scroll is fixed to the first frame, and a second frame is further mounted in the shell. A balancer chamber is formed between the first and second frames. A main shaft having a balancer is housed in the balancer chamber rotatably. The main shaft includes an enlarged diameter portion on one end of the shaft which is attached to the orbiting scroll and a small diameter portion at the opposite end of the shaft, said shaft extending between the first frame and the second frame for driving the orbiting scroll. A first bearing is disposed between the main shaft and the first frame for supporting the main shaft at a position at the orbiting scroll end of the shaft. A second bearing is disposed between the main shaft and the second frame for supporting the main shaft at a position proximate the opposite end of the shaft. The main shaft having an eccentric hole that contains a rotatable eccentric bushing. The bushing includes a passage for continuous flow of lubricant during shaft rotation and a structure that restricts the rotation of the bushing and prevents it from moving in an axial direction.

Motor driven scroll-type machine with an eccentric bushing structure for

A scroll-type compressor including stationary and orbiting scrolls housed in a shell. A first frame, also housed in the shell, receives a portion of the orbiting scroll. The stationary scroll is fixed to the first frame, and a second frame is further mounted in the shell. A balancer chamber is formed between the first and second frames. A main shaft having a balancer is housed in the balancer chamber rotatably. The main shaft includes an enlarged diameter portion on one end of the shaft which is attached to the orbiting scroll and a small diameter portion on the end of the shaft which is attached to the orbiting scroll and extending between the first frame and the second frame for driving the orbiting scroll. A first bearing is disposed between the main shaft in the first frame for supporting the main shaft at a position between the orbiting scroll end of the shaft. A second bearing is disposed between the main shaft and the second frame for supporting the main shaft at a position proximate opposite the end of the shaft. The main shaft has an eccentric hole at the upper enlarged diameter portion thereof that can receive the shaft of the orbiting scroll. The main shaft has an oil passage connecting the lower end of the shaft, that is dipped into an oil pan, to the upper end of the shaft at the eccentric hole. The passage is structured to suck oil from the oil pan to the eccentric hole during rotation of the shaft. The eccentric hole has oil holes and passages that permit lubrication to flow to the appropriate bearings.

Motor driven scroll-type machine with compact oil lubricating structure

A scroll-type compressor including stationary and orbiting scrolls housed in a shell. A first frame, also housed in the shell, receives a portion of the orbiting scroll. The stationary scroll is fixed to the first frame, and a second frame is further mounted in the shell. A balancer chamber is formed between the first and second frames. A main shaft having a balancer is housed in the balancer chamber rotatably. The main shaft includes an enlarged diameter portion on one end of the shaft which is attached to the orbiting scroll and a small diameter portion on the end of the shaft which is attached to the orbiting scroll and extending between the first frame and the second frame for driving the orbiting scroll. A first bearing is disposed between the main shaft in the first frame for supporting the main shaft at a position between the orbiting scroll end of the shaft. A second bearing is disposed between the main shaft and the second frame for supporting the main shaft at a position proximate opposite the end of the shaft. The main shaft has an axial oil passage that extends from a bottom portion that is in contact with an oil pan at the bottom of the shell to an eccentric hole in the top of the shaft that is adapted to receive the orbiting scroll shaft. Upon rotation of the shaft, oil is pumped up to the eccentric hole. An Oldham coupler at the top of the main shaft and motor mounting legs have oil return holes and passages that assure proper lubrication of the compressor.

Motor driven scroll-type machine with cooling and lubricating structure

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. The elastic element is supported by the spiral wrap by friction.

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Shizuoka, Japan

Masahiko Oide