Fujitsu General Limited

Motonobu Furukawa

Hiroki Katayama

Taku Morishita

Naoya Morozumi

Junya Tanaka

Takefumi Inagaki

Makoto Araki

Mitsuru Shiraishi

Hiroki Tomoda

Akira Shimada

Shuji Takeda

Masaki Fujino

Masashi Katayama

Jyunya Tanaka

Yasuyuki Izumi

Takahiro Sasaki

Naoto Tada

Koji Ukai

Hideto Uchikai

A compression unit of a rotary compressor includes a cylinder, an upper end plate that closes the upper side of the cylinder, a lower end plate that closes the lower side of the cylinder, and a piston that is fitted to a rotating shaft, revolves along an inner peripheral surface of the cylinder, and forms a cylinder chamber in the cylinder. At least one of an end face of the piston in the axial direction of the rotating shaft, a sliding surface of the upper end plate that slides with the end face of the piston, and a sliding surface of the lower end plate that slides with the end face of the piston, has formed therein an oil-film retention region having an array of a plurality of recessed portions that retain lubricating oil.

Rotary compressor including a plurality of recessed portions for retaining lubricating oil

Provided is a rotary compressor excellent in energy saving performance and reliability that can suppress over-compression of a compressed refrigerant compressed in a compression chamber. A rotary compressor includes a discharge port provided on an end plate and partially located outside a cylinder inner wall and a discharge groove provided on the cylinder inner wall and communicating with a compression chamber and the discharge port, the compression chamber compressing a refrigerant by contracting as an annular piston revolves, in which the discharge port faces an end portion of a vane groove on the cylinder inner wall on the compression chamber side.

Rotary compressor

In a rotary compressor, a lower end plate cover is formed in a shape of a flat plate, and has a through hole that is provided to penetrate in the thickness direction of the lower end plate cover and that communicates with a communication groove. When a sectional area of the communication groove which passes through a center line of a rotation shaft, and is on a section along the rotation shaft direction is S1 [mm], an area in which the through hole and the communication groove overlap each other on a plane orthogonal to the rotation shaft is S2 [mm], and an excluding capacity of a lower cylinder chamber is V [cc], each of 0.10&#x2264;(S2/V)&#x2264;0.50, and 1.0&#x2264;(S2/S1)&#x2264;7.0 is satisfied.

A rotary compressor includes a sealed longitudinal compressor housing which is provided with a discharge portion of a refrigerant at an upper portion thereof, is provided with an inlet portion of a refrigerant at a lower portion thereof, and in which lubricant oil is stored; a compressing unit which is disposed in the compressor housing, compresses a refrigerant sucked from the inlet portion and discharges the refrigerant from the discharge portion; a motor which is disposed in the compressor housing and drives the compressing unit via a rotation shaft; and an accumulator which is attached to a side portion of the compressor housing and is connected to the inlet portion of the refrigerant. When an inner diameter of a cylinder constituting the compressing unit is referred to as Dc, a height of the cylinder is referred to as Hc, and an eccentric amount of an eccentric portion of the rotation shaft is referred to as e, Dc, Hc, and e are set so that a value obtained by an expression (e+Hc)&#xb7;(Dc&#x2212;e)/(e&#xb7;Hc)is less than 4.1.

An upper piston of a rotary compressor is formed to satisfy 0.7&#xd7;Hcy1/1000&#x2264;&#x3b4;ro&#x2264;1.2&#xd7;Hcy1/1000, Cro1&#x2264;0.1, Cro2&#x2264;0.1, and Cro1&#xd7;Cro2&#x2264;0.007. Here, Cro1 indicates a length (mm) of an upper side piston outer circumferential chamfer portion in a height direction, and Cro2 indicates a length (mm) of the upper side piston outer circumferential chamfer portion in a normal line direction of a piston outer circumferential surface. An upper vane is formed to satisfy 0.7&#xd7;Hcy1/1000&#x2264;&#x3b4;v&#x2264;1.2&#xd7;Hcy1/1000, Cv1&#x2264;0.06, Cv2&#x2264;0.06, and Cv1&#xd7;Cv2&#x2264;0.003. Here, Cv1 indicates a length (mm) of an upper side vane ridge line chamfer portion in a height direction, and Cv2 indicates a length (mm) of the upper side vane ridge line chamfer portion in a normal line direction of a vane tip end surface.

In a rotary compressor, a lower end plate cover is formed in a flat plate shape, a lower discharge chamber concave portion is formed in a lower end plate to overlap a lower discharge hole side of a lower discharge valve accommodation concave portion, and the lower discharge chamber concave portion is formed in a fan-like range between a diametrical line passing through a center of a sub-bearing unit and a midpoint of a line segment connecting a center of the lower discharge hole and a center of a lower rivet to each other and a diametrical line opened by a pitch angle 90&#xb0; in a direction of the lower discharge hole about the center of the sub-bearing unit. At least a portion of a refrigerant path hole overlaps the lower discharge chamber concave portion and is disposed at a position communicating with the lower discharge chamber concave portion.

Rotary compressor having communication path hole overlap with discharge chamber concave portion

On a plane orthogonal to the rotation shaft, an upper muffler chamber has a plurality of flared portions that are flared from a center of a rotation shaft toward between penetrating bolts and a plurality of small-diameter portions that connect between the flared portions, are apart from penetrating bolts, and are formed on a center side of the rotation shaft from the penetrating bolts. A muffler outlet is provided in each flared portion. A second outlet and a refrigerant path hole of an upper end plate are positioned on an inside of one of a plurality of flared portions, and an opening area of the muffler outlet of one flared portion is greater than an opening area of the muffler outlet of each of the other flared portions.

In an air conditioner having a refrigerant circuit in which a compressor, a four-way switching valve, an outdoor-side heat exchanger, an expansion valve, and an indoor-side heat exchanger are connected in succession via pipes, the interior of an enclosed vessel of a compressor, which contains a refrigerant compressing section and an electric motor, is divided airtightly into a refrigerant discharge chamber and an electric motor chamber, two refrigerant flow path pipes are provided on the electric motor chamber side, and these refrigerant flow path pipes are appropriately switched to the refrigerant discharge side and the refrigerant suction side of the compressor via the four-way switching valve, whereby one compressor can be used as an internal high pressure type or an internal low pressure type.

Growing community of inventors

Kanagawa, Japan

Motonobu Furukawa