JP3356460B2 - Hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor constituting a refrigeration cycle, and more particularly to a structure of a crankshaft thereof.

[0002]

2. Description of the Related Art Conventionally, a crankshaft of a hermetic compressor for an air conditioner or the like has a part of an eccentric shaft cut away to lubricate a gap between a piston and the eccentric shaft.

The configuration of a conventional example will be described below with reference to FIGS. A motor element 4 including a stator 2 and a rotor 3 and a compressor element 5 driven by the motor element 4 via a crankshaft 6 are disposed inside the closed casing 1 to form a hermetic compressor. Is composed.

[0004] The compressor element 5 includes the crankshaft 6.
A piston 8 fitted on the eccentric shaft 7 of the crankshaft; a cylindrical cylinder 9 for accommodating the piston 8; an upper bearing end plate 10 for closing both ends of the cylinder 9; It is constituted by an end plate 11. The upper and lower bearing end plates 10 and 11 form a pair, and also support the crankshaft 6.

[0005] As shown in FIG. 5, the crankshaft 6 is composed of three parts, an upper shaft 12, an eccentric shaft 7, and a lower shaft 13, and is a hollow shaft. A blade 14 is inserted into the crankshaft 6 and an oil hole 15 communicating with the hollow shaft is provided.

Further, the eccentric shaft 7 of the crankshaft has
In addition to the oil hole 15, a notch 16 parallel to the axial direction of the crankshaft 6 is provided.

The operation of the conventional hermetic compressor constructed as described above will be described. When the motor element 4 is operated, the refrigerant is sucked into the cylinder 9 and the piston 8
The compressed refrigerant is compressed with the rotation of the
It is discharged into. In addition, the oil (not shown) at the bottom of the closed container 1 causes the centrifugal force of the crankshaft 6 to rotate,
By the action of the blades 14 provided in the crankshaft, it goes up in the crankshaft, goes out through each oil hole 15 provided in the crankshaft 6, and lubricates each sliding portion. In particular, the oil coming out of the oil hole 15 provided in the eccentric shaft 7 lubricates between the oil and the piston 8 fitted to the eccentric shaft 7 by the notch 16 provided in the eccentric shaft 7 of the crankshaft 6. .

[0008]

However, in the above notch 16, the sliding area between the eccentric shaft 7 of the crankshaft 6 and the piston fitted thereto is large, and the eccentric shaft 7 and the piston 8 There was a problem that the sliding loss was large.

Furthermore, in the conventional structure, the distribution of oil is not uniform in the gap between the eccentric shaft 7 and the piston 8, and the wear of the eccentric shaft 7 increases, and in the worst case, seizure occurs. Had issues.

The present invention has been made in view of the above problems, and provides a shaft of a hermetic compressor having a large cutout provided on a sliding surface of a shaft eccentric shaft with a piston.

[0011]

In order to solve the above-mentioned problems, the present invention provides an outer peripheral surface of an eccentric shaft on a crankshaft side, which is provided outside the eccentric shaft.
A circular groove having a diameter larger than the diameter is provided .

[0012]

According to the present invention, the sliding area of a portion where a large load is applied to the crankshaft is the same as the conventional one,
It is possible to reduce the sliding area of a portion where a load is small and there is a margin, to reduce the sliding loss of the crankshaft, and to prevent wear by increasing the lubricating effect of oil more than before.

[0013]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

The same components as those in the above-described conventional example are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 shows a main part of a hermetic compressor showing one embodiment of the present invention. The present invention relates to an eccentric shaft 7 of a crankshaft 6.
In addition, a circular groove larger than the eccentric amount of the eccentric shaft 7 and eccentric from the center axis of the crankshaft 6 and having a diameter larger than the outer diameter of the eccentric shaft 7 is provided on the outer peripheral surface of the eccentric shaft on the crankshaft side .

The operation of the above configuration will be described below. When the electric motor element 4 is operated, the rotor 3 is driven. With the driving of the rotor 3, the piston 8 is driven via the crankshaft 6. , Compressed and discharged.

Further, the oil at the bottom of the closed casing 1 goes up inside the crankshaft 6 due to the centrifugal force of the rotation of the crankshaft 6 and the action of the blades 14 provided inside the crankshaft. The oil which goes up inside the crankshaft 6 goes out of the crankshaft 6 through an oil hole 15 provided in the crankshaft 6 on the way, and lubricates each sliding portion. Oil coming out of the oil hole 15 provided in the eccentric shaft 7
Filled in a circular groove provided in, it is smoothly lubricated clearance between the piston 8 and the eccentric shaft 7. Also, at the same time the lubricating oil is smooth, reduced sliding area of the piston 8, it is possible to decrease even low sliding loss due to the viscosity of the oil, the sliding loss of the eccentric shaft 7 and the piston 8 Can be reduced.
Further, the smooth lubrication can also prevent an increase in wear on the eccentric shaft 7.

[0018]

As described above, the present invention relates to an eccentric shaft clamp.
By providing a circular groove on the outer periphery of the shaft, the sliding area is reduced, and by supplying oil smoothly between the eccentric shaft and the piston, lubrication is smoothed and the sliding loss is reduced. Things. In addition, the smooth lubrication of the oil also has the effect of preventing abnormal wear and seizure of the eccentric portion of the crankshaft.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic compressor showing one embodiment of the present invention.

FIG. 2 is a side view of the crankshaft.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of the crankshaft.

FIG. 5 is a side view of a conventional crankshaft.

FIG. 6 is a longitudinal sectional view of the compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 4 Electric motor element 5 Compressor element 6 Crankshaft 7 Eccentric shaft 8 Piston

Continued on the front page (72) Inventor Tatsuhisa Taguchi 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Shigeru Muramatsu 1006 Kadoma Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 56) References JP-A-56-88988 (JP, A)

Claims (2)

(57) [Claims] An electric motor element and a rotary compressor element driven by the electric motor element are provided in a closed container, and the eccentric shaft is formed on an eccentric shaft formed on a part of a crankshaft constituting the compressor element. The eccentricity of the crankshaft relative to the central axis is larger than that of the crankshaft, and a circular groove having a diameter larger than the diameter of the eccentric shaft is formed in the crankshaft of the eccentric shaft.
A hermetic compressor provided on an outer peripheral surface on a shaft side . 2. The hermetic compressor according to claim 1, wherein the crankshaft is a hollow shaft through which oil flows, and has an oil hole communicating the hollow shaft with the circular groove.