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Scroll compressor

a compressor and scroll technology, applied in the direction of machines/engines, rotary/oscillating piston pump components, liquid fuel engines, etc., can solve the problems of increasing the power consumption of the motor, and achieve the effect of preventing seizures, and improving the reliability of the scroll compressor

Inactive Publication Date: 2014-01-16
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The compression mechanism described in this patent prevents a sudden drop in oil pressure when there is a tilting of the mechanism. This is achieved by separating the oil groove from the bearing oil supply passage, so that any decrease in oil pressure in the groove does not affect the pressure of the supply passage. This prevents a decrease in lubricating oil for the bearing, which could cause damage to the mechanism.

Problems solved by technology

In such a case, the friction force generated between the thrust sliding surface (536) of the orbiting scroll (530) and the thrust sliding surface (527) of the fixed scroll (525) becomes strong, resulting in an increase in power consumption of the motor (515).

Method used

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Effect test

embodiment

[0063]Embodiment 1 of the present disclosure is now described. A scroll compressor (10) of this embodiment is a hermetic compressor. The scroll compressor (10) is connected to a refrigerant circuit which performs a refrigerating cycle, and configured to suck and compress the refrigerant of the refrigerant circuit.

[0064]

[0065]As illustrated in FIG. 1, the scroll compressor (10) includes a casing (15), and a compression mechanism (20), a motor (50), a lower bearing member (55), and a driving shaft (60) are housed in the inner space of the casing (15). The casing (15) is a hermetic container having a vertically oriented cylindrical shape. In the inner space of the casing (15), the compression mechanism (20), the motor (50), and the lower bearing member (55) are arranged in this order from top to bottom. The driving shaft (60) is disposed such that the axial direction of the driving shaft (60) is along the vertical direction of the casing (15). The structure of the compression mechanism...

embodiment 2

[0132]Embodiment 2 of the present disclosure will be described below, focusing on differences between a scroll compressor (10) of Embodiment 2 and that of Embodiment 1.

[0133]As illustrated in FIG. 4, in a compression mechanism (20) of this embodiment, an oil groove (80) is formed not on a fixed scroll (30) but on an orbiting scroll (40). Specifically, the oil groove (80) of this embodiment is located on an end plate (41) of the orbiting scroll (40). The oil groove (80) is a groove formed by depressing a thrust sliding surface (45) of the end plate (41), and has a ring shape surrounding a lap (42) of the orbiting scroll (40). In this embodiment, a terminal end of a connection passage (86) opens on a thrust sliding surface (35) of the fixed scroll (30). The terminal end of the connection passage (86) has a large width such that the connection passage (86) can continue to communicate with the oil groove (80) even when the orbiting scroll (40) moves,

[0134]According to this embodiment, i...

embodiment 3

[0135]Embodiment 3 of the present disclosure will be described below, focusing on differences between a scroll compressor (10) of Embodiment 3 and that of Embodiment 1.

[0136]As illustrated in FIG. 5, in this embodiment, a central cylindrical portion (56) of a lower bearing member (55) is different from that of Embodiment 1. Specifically, the central cylindrical portion (56) extends along an auxiliary shaft portion (67) which forms a lower end part of a driving shaft (60), from the upper end to the lower end of auxiliary shaft portion (67). The central cylindrical portion (56) has a recess formed in an upper end part thereof, and a rolling bearing (54) is provided in the recess. The rolling bearing (54) is penetrated by the auxiliary shaft portion (67) of the driving shaft (60). With this configuration, the central cylindrical portion (56) serves as an auxiliary bearing which supports the auxiliary shaft portion (67).

[0137]Further, in this embodiment, a first connection passage (81) ...

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Abstract

A scroll compressor (10) includes a bearing oil supply passage (70) configured to supply a refrigeration oil from an oil reservoir (18) located in a casing (15) to a bearing of a driving shaft (60). An oil groove (80) which communicates only with the oil reservoir (18) in the casing (15) through a connection passage (86) and a capillary tube (87) is formed on a thrust sliding surface (35) of a fixed scroll (30). Since the bearing oil supply passage (70) is not in communication with the oil groove (80), even when an orbiting scroll (40) is tilted and a pressure of the oil groove (80) decreases, a pressure of the bearing oil supply passage (70) does not decrease, and accordingly, the refrigeration oil is supplied from the bearing oil supply passage (70) to the bearing of the driving shaft (60).

Description

TECHNICAL FIELD[0001]The present disclosure relates to measures to improve reliability of scroll compressors.BACKGROUND ART[0002]Conventionally, scroll compressors have been widely used to compress, e.g., refrigerants or air. For example, Patent Document 1 discloses a hermetic scroll compressor. Here, the structure of the scroll compressor (500) disclosed in Patent Document 1 is described with reference to FIG. 9.[0003]The scroll compressor (500) includes a vertically oriented cylindrical casing (510) in which a compression mechanism (520) and a motor (515) are housed. The compression mechanism (520) is disposed above the motor (515), and a driving shaft (550) connects the compression mechanism (520) to the motor (515).[0004]The compression mechanism (520) includes a fixed scroll (525), an orbiting scroll (530), and housing (540). The orbiting scroll (530) has an end plate (531), a lap (532) projecting from the front side of the end plate (531), and a cylindrical portion (533) proje...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C18/02
CPCF04C18/0207F04C18/0253F04C23/008F04C29/025F04C29/028F04C18/0215F04C2240/806F05C2253/22
Inventor UEKAWA, TAKASHINISHIDE, YOUHEIKATOU, KATSUMI
Owner DAIKIN IND LTD