scroll compressor

Abstract

The scroll compressor of the present invention comprises: a fixed scroll (112); an orbiting scroll (109); a crank shaft (103) having an eccentric portion (108) at the end; and an oil supply hole (115) having an opening on the end surface of the eccentric part; a revolving sliding bearing (110) provided on the revolving scroll and slidingly engaged with the eccentric part; provided on the outer periphery of the eccentric part The lubricating oil supplied from the oil supply hole lubricates the space between the eccentric part and the swivel sliding bearing through the oil supply passage (116). An axial loss reduction groove (117) is provided on the outer periphery of the eccentric portion independently of the oil supply passage, and at least one of the end face side and the base end side of the eccentric portion in the loss reduction groove is Equipped with sealing parts (118a, 118b). Thereby, the shear resistance of the oil film due to the lubricating oil present between the outer peripheral surface of the eccentric portion of the crankshaft and the inner peripheral surface of the orbiting sliding bearing can be reduced, thereby reducing bearing loss during fluid lubrication.

Description

technical field [0001] The present invention relates to a scroll compressor used in a refrigerating and air-conditioning apparatus, and more particularly, to a scroll compressor in which an orbiting slide bearing is provided on an orbiting scroll to engage and slide with an eccentric portion of a crankshaft. Background technique [0002] A scroll compressor is a compressor that compresses gas such as a refrigerant by relatively orbiting two scroll members having a helical tooth shape. Generally, the other movable orbiting scroll is configured to orbit with respect to the fixed scroll constrained by screws, welding, or the like. In many cases, a mechanism is adopted in which an orbiting slide bearing is provided on the orbiting scroll to engage and slide with the eccentric portion of the crankshaft, and the eccentric portion of the crankshaft and the orbiting sliding bearing slide with lubricating oil while the crank The vibrating rotational motion of the shaft is transmitte...

AI Technical Summary

Problems solved by technology

[0014] However, in the structure of the above-mentioned Patent Document 1, the number of components increases, so the structure becomes complicated, and the number of sliding parts also increases, and new problems arise, such as requiring high management accuracy of the bearing gap size.

In addition, during low-speed operation, due to the reduction of sliding speed, it is difficult to form an oil film, so there is also a problem that direct contact with the sliding bush is likely to occur.

[0015] In addition, the structure of the above-mentioned Patent Document 2 is effective in promoting the inflow of lubricating oil from the outside to the bearing gap to prevent oil film rupture and prevent direct contact between the shaft and the bearing. There is a notch in the place where the gap is large, so the reduction of the shear resistance of the fluid lubricating oil film cannot be expected, or the reduction effect is small

Therefore, once a fluid lubricating oil film is formed to form a state where there is no direct contact part, the loss reduction above this cannot be achieved or is limited.

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