Scroll compressor

Patent metadata

Field	Value
Publication number	US-2016208803-A1
Application number	US-201414911459-A
Country	US
Kind code	A1
Filing date	Aug 4, 2014
Priority date	Aug 12, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A scroll compressor includes a casing, a compression mechanism accommodated within the casing, a motor arranged to rotatably drive the crankshaft, an oil feed pump arranged to feed lubricating oil upward, a lower oil reservoir disposed in a space below the oil feed pump to hold lubricating oil, an oil feed path and an oil retention space. The compression mechanism has a stationary scroll and a moveable scroll forming a compression chamber. The crankshaft is linked to the moveable scroll. The oil feed passage is formed so as to extend in an axial direction within an interior of the crankshaft and communicates at a lower end with a discharge side of the oil feed pump. The oil retention space is formed so as to extend in an axial direction within the interior of the crankshaft separately from the oil feed passage and communicates with the oil feed passage.

First claim

1 . A scroll compressor comprising:
a casing; a compression mechanism accommodated within the casing, the compression mechanism having a stationary scroll and a moveable scroll forming a compression chamber in relation to the stationary scroll; a crankshaft linked to the moveable scroll; a motor or arranged to rotatably drive the crankshaft; an oil feed pump arranged to feed lubricating oil upward; a lower oil reservoir disposed in a space below the oil feed pump to hold lubricating oil; an oil feed passage formed so as to extend in an axial direction within an interior of the crankshaft and communicating at a lower end with a discharge side of the oil feed pump; and an oil retention space formed so as to extend in an axial direction within the interior of the crankshaft separately from the oil feed passage and communicating with the oil feed passage.

2 . The scroll compressor according to claim 1 , wherein
the oil feed passage and the oil retention space communicate via a communicating passage disposed in the interior of the crankshaft.

3 . The scroll compressor according to claim 1 , wherein
the oil retention space communicates with the discharge side of the oil feed pump via a space within the oil feed passage, without communicating directly with the discharge side of the oil feed pump.

4 . The scroll compressor according to claim 1 , wherein
the oil feed passage, the crankshaft, and the oil retention space are each cylindrical in shape, and an axial center of the oil retention space is disposed at a location closer to an axial center of the crankshaft with respect to an outer periphery thereof, than an axial center of the oil feed passage.

5 . The scroll compressor according to claim 4 , wherein
the axial center of the oil retention space is disposed at a location identical to the location of the axial center of the crankshaft with respect to the outer periphery thereof.

6 . The scroll compressor according to claim 1 , further comprising
a supply passage disposed such that it is possible to supply lubricating oil towards an outer periphery of the crankshaft from an interior of the oil feed passage.

7 . The scroll compressor according to claim 6 , wherein
the supply passage is a horizontal oil-feed hole disposed so as to pass between the interior of the oil feed passage and the outer periphery of the crankshaft in the crankshaft interior.

8 . The scroll compressor according to claim 7 , wherein
the oil retention space either lacks an opening that penetrates as far as the outer periphery of the crankshaft, or is provided with a hole that extends so as to penetrate from an interior of the oil retention space to the outer periphery of the crankshaft and has a smaller passage cross-sectional area than the horizontal oil-feed hole.

9 . The scroll compressor according to claim 7 , further comprising:
an upper bearing part supporting the crankshaft from a circumferential direction; and a lower bearing part supporting the crankshaft from a circumferential direction, at a point below the upper bearing part, the horizontal oil-feed hole having a lower bearing horizontal oil-feed hole that extends towards the lower bearing part from within the oil feed passage, and the oil retention space and the oil feed passage communicating at a location below a location at which the lower bearing horizontal oil-feed hole branches from the oil feed passage.

10 . The scroll compressor according to claim 9 , further comprising
an upper communicating passage providing communication between the interior of the oil feed passage and the interior of the oil retention space, the oil retention space and the oil feed passage communicating at a location below the upper communicating passage.

11 . The scroll compressor according to claim 7 , further comprising:
an upper bearing part supporting the crankshaft from a circumferential direction; and a lower bearing part supporting the crankshaft from a circumferential direction, at a point below the upper bearing part, the horizontal oil-feed hole having an upper bearing horizontal oil-feed hole that extends towards an inner peripheral surface of the upper bearing part from within the oil feed passage.

12 . The scroll compressor according to claim 7 , wherein
the moveable scroll has a cylindrical part covering an upper end of the crankshaft from the circumferential direction, and the horizontal oil-feed hole has an upper horizontal oil-feed hole that extends towards an inner peripheral surface of the cylindrical part from within the oil feed passage.

13 . The scroll compressor according to any of claims 4 , wherein
an inside diameter of the oil retention space is 0.5-2.0 times an inside diameter of the oil feed passage.

14 . The scroll compressor according to claim 1 , wherein
the oil retention space is open at an upper end.

15 . The scroll compressor according to claim 1 , further comprising
a member arranged in an interior of the oil retention space to limit a descent speed of the lubricating oil within the oil retention space.

16 . The scroll compressor according to claim 2 , wherein
the oil retention space communicates with the discharge side of the oil feed pump via a space within the oil feed passage, without communicating directly with the discharge side of the oil feed pump.

17 . The scroll compressor according to claim 2 , wherein
the oil feed passage, the crankshaft, and the oil retention space are each cylindrical n shape, and an axial center of the oil retention space is disposed at a location closer to an axial center of the crankshaft with respect to an outer periphery thereof than an axial center of the oil feed passage.

18 . The scroll compressor according to claim 3 , wherein
the oil feed passage, the crankshaft, and the oil retention space are each cylindrical in shape, and an axial center of the oil retention space is disposed at a location closer to an axial center of the crankshaft with respect to an outer periphery thereof than an axial center of the oil feed passage.

Assignees

• Daikin Ind Ltd

Inventors

• Uekawa Takashi
• Watanabe Eri
• Fuwa Masaaki

Classifications

• F04C18/0215

  where only one member is moving · CPC title

• F04C29/023 Primary

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C29/025

  using a lubricant pump · CPC title

• F04C29/0057

  for eccentric movement · CPC title