ROTARY COMPRESSOR

• US 20150233376A1
• Filed: 11/14/2012
• Published: 08/20/2015
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ogata, Takeshi, Shiotani, Yu, Hikichi, Takumi, Shii, Kentaro, Shoyama, Tadayoshi
• Granted Patent: US 9,695,819 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 2240/80 Other components
• CPC Class Codes: F04C 2240/809 Lubricant sump
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0042 Driving elements, brakes, couplings, transmissions specially adapted for pumps brakes, couplings, transmissions per se F16, B60
• CPC Class Codes: F04C 29/02 Lubrication of machines or engines in general F01M; Lubricant separation separation in general B01D
• CPC Class Codes: F04C 29/028 Means for improving or restricting lubricant flow
• CPC Class Codes: F04C 29/04 Heating; Cooling of machines or engines in general F01P; Heat insulation heat insulation in general F16L59/00
• CPC Class Codes: F04C 29/12 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

A rotary compressor (100) includes a closed casing (1), a cylinder (15), a piston (28), a lower bearing member (7), a vane (33), a suction port, a discharge port (41), and a partition member (10). The partition member (10) is attached to a second principal surface (7a) of the lower bearing member (7) located on the opposite side to the cylinder (15) so as to form a refrigerant discharge space (52) serving as a flow path of a refrigerant discharged from a discharge chamber through the discharge port (41). The refrigerant discharge space (52) is limited so that a region where the refrigerant discharge space (52) is not present is formed on the same side as the suction port with respect to a first reference plane, and in that region, the second principal surface (7a) of the lower bearing member (7) is in contact with an oil in an oil reservoir (22) directly or via the partition member (10).

Claims

1. A rotary compressor comprising:

a closed casing comprising an oil reservoir;

a cylinder disposed inside the closed casing so as to be immersed in the oil reservoir;

a piston disposed inside the cylinder;

a bearing member disposed above or below the cylinder so as to form a cylinder chamber between the cylinder and the piston, the bearing member having a first principal surface that is in contact with the cylinder and a second principal surface that is opposite to the first principal surface;

a vane that partitions the cylinder chamber into a suction chamber and a discharge chamber;

a suction port though which a refrigerant to be compressed is introduced into the suction chamber;

a discharge port through which the compressed refrigerant is discharged from the discharge chamber, the discharge port being formed in the bearing member; and

a partition member attached to the second principal surface of the bearing member so as to form, together with the bearing member, a refrigerant discharge space capable of retaining the refrigerant discharged from the discharge chamber through the discharge port,

wherein when (i) a plane including a central axis of the cylinder and a center of the vane when the vane protrudes maximally toward the central axis of the cylinder is defined as a first reference plane, (ii) a plane including the central axis and perpendicular to the first reference plane is defined as a second reference plane, and (iii) four segments obtained by dividing the rotary compressor by the first reference plane and the second reference plane are defined as a first quadrant segment including the suction port, a second quadrant segment including the discharge port, a third quadrant segment opposite to the first quadrant segment and adjacent to the second quadrant segment, and a fourth quadrant segment opposite to the second quadrant segment and adjacent to the first quadrant segment, respectively,

the refrigerant discharge space falls within a combined region consisting of a region corresponding to the first quadrant segment, a region corresponding to the second quadrant segment, and a region corresponding to the third quadrant segment, and

the second principal surface of the bearing member is in contact with an oil in the oil reservoir directly or via the partition member over an extended region defined by extending a region corresponding to the fourth quadrant segment circumferentially around the central axis to the refrigerant discharge space.

2. The rotary compressor according to claim 1, wherein the second principal surface of the bearing member is a plane, and a recess into which the discharge port opens is formed in the second principal surface, the recess having a depth larger than a half of a distance between the first principal surface and the second principal surface.

3. The rotary compressor according to claim 1, wherein a recess into which the discharge port opens is formed in the second principal surface of the bearing member, and a cutout is formed in the second principal surface on the opposite side to the recess with respect to the central axis.

4. The rotary compressor according to claim 2, wherein the partition member comprises a single plate-like member, and

the recess formed in the second principal surface is closed by the partition member so as to form the refrigerant discharge space.

5. The rotary compressor according to claim 1, wherein

the bearing member is disposed below the cylinder and includes a circular plate portion that defines the first principal surface and the second principal surface and a protruding portion that protrudes downward at a center of the circular plate portion, and

the partition member has a shape enclosing the discharge port together with a space facing the second principal surface of the bearing member, and the space enclosed by the bearing member and the partition member constitutes the refrigerant discharge space.

6. The rotary compressor according to claim 1, wherein

when (a) a plane including the central axis and a center of the suction port is defined as a third reference plane, (b) one of two segments obtained by dividing the rotary compressor by the first reference plane is defined as a first high-temperature segment including the discharge port, (c) one of two segments obtained by dividing the rotary compressor by the third reference plane is defined as a second high-temperature segment including the discharge port, and (d) three of four segments obtained by dividing the rotary compressor by the first reference plane and the third reference plane are collectively defined as a combined high-temperature segment, the three segments being included in the first high-temperature segment or the second high-temperature segment,

in a projection view obtained by projecting the combined high-temperature segment and the refrigerant discharge space onto a plane perpendicular to the central axis, 70% or more of a region corresponding to the refrigerant discharge space overlaps a region corresponding to the combined high-temperature segment.

7. The rotary compressor according to claim 1, further comprising a shaft to which the piston is fitted, wherein

the rotary compressor is a vertical rotary compressor in which a rotational axis of the shaft is parallel to a direction of gravity and the oil reservoir is formed at a bottom of the closed casing.