COMPRESSOR

• US 20150030487A1
• Filed: 02/08/2013
• Published: 01/29/2015
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Toyama, Toshiyuki, Fukunaga, Tsuyoshi
• Granted Patent: US 9,617,996 B2
• Time in Patent Office: Days
• US Class Current: 418/55.1
• CPC Class Codes: F04B 39/0246 in the rotating shaft
• CPC Class Codes: F04B 39/0261 with an auxiliary oil pump
• CPC Class Codes: F04C 18/02 of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/02 Lubrication of machines or engines in general F01M; Lubricant separation separation in general B01D
• CPC Class Codes: F04C 29/025 using a lubricant pump

Abstract

A compressor includes a casing, a motor fixed to the casing, a vertically extending drive shaft coupled to the motor, and a compression mechanism driven by the drive shaft to compress a fluid. A shaft-inside oil supply path is provided in the drive shaft. Oil at a bottom of the casing is supplied through the shaft-inside oil supply path to a sliding portion of the drive shaft above the motor. The compressor includes a shaft-inside oil discharge path provided in the drive shaft, and an oil discharge coupled to a lower end of the drive shaft. The shaft-inside oil discharge path extends from an upper portion to a lower portion of the motor. The oil discharge pump discharges the oil that has been supplied to the sliding portion of the drive shaft to the bottom of the casing through the shaft-inside oil discharge path.

Claims

1. A compressor comprising:

a casing;

a motor fixed to the casing;

a drive shaft coupled to the motor, the drive shaft extending vertically;

a compression mechanism driven by the drive shaft, the compression mechanism being configured to compress a fluid; and

a shall-inside oil supply path provided in the drive shaft, the shaft-inside oil supply path being configured such that oil at a bottom of the casing is supplied through the shaft-inside oil supply path to a sliding portion of the drive shaft above the motor,

the compressor including

a shaft-inside oil discharge path provided in the drive shaft, the shaft-inside oil discharge path extending from an upper portion to a lower portion of the motor, and

an oil discharge pump coupled to a lower end of the drive shaft, the oil discharge pump being arranged and configured to discharge the oil that has been supplied to the sliding portion of the drive shaft to the bottom of the casing through the shaft-inside oil discharge path.

2. The compressor of claim 1, further comprising

an oil supply pump arranged and configured to supply the oil at the bottom of the casing to the shaft-inside oil supply path, the oil supply pump forming a double pump with the oil discharge pump.

3. The compressor of claim 2, wherein

the oil supply pump has a capacity that is larger than a capacity of the oil discharge pump.

4. The compressor of claim 1, further comprising

a lower bearing member rotatably supporting a portion of the drive shaft lower than the motor;

and

shaft-outside oil discharge paths formed in the lower bearing member, the shaft-outside oil discharge paths communicating with an outlet end of the shaft-inside oil discharge path and a suction port of the oil discharge pump.

5. The compressor of claim 2, further comprising

a lower bearing member rotatably supporting a portion of the drive shaft lower than the motor;

and

shaft-outside oil discharge paths formed in the lower bearing member, the shaft-outside oil discharge paths communicating with an outlet end of the shaft-inside oil discharge path and a suction port of the oil discharge pump.

6. The compressor of claim 3, further comprising

a lower bearing member rotatably supporting a portion of the drive shaft lower than the motor;

and

shaft-outside oil discharge paths formed in the lower bearing member, the shaft-outside oil discharge paths communicating with an outlet end of the shaft-inside oil discharge path and a suction port of the oil discharge pump.