JPH04101097A - Closed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To improve abrasion resistance in the sliding faces of a main and an auxiliary bearings by providing the main and auxiliary bearings with nitride layers in a compressor provided with the main and auxiliary bearings for airtightly closing the both side faces of a cylinder for accommodating an eccentrically rotated roller. CONSTITUTION:When a shaft 2 is rotated by a motor, a roller 7 is rotated eccentrically inside a cylinder 4 so that refrigerant is sucked into a compression chamber partitioned by a main bearing 5 and an auxiliary bearing 6 for closing the cylinder 4 and both side faces of the cylinder 4 airtightly, and discharged after being pressurized. In this case, nitride layers 21 are formed, by nitriding, on the surface of the main and auxiliary bearings 5, 6. This results in improving abrasion resistance against the sliding friction of the roller 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic electric compressor used in refrigeration cycles and the like.

Conventional technology In recent years, hermetic electric compressors used in refrigeration cycles, etc., have become increasingly difficult to use and use environments.
Extremely harsh conditions have become necessary, and improvements in reliability, particularly in terms of wear resistance, have been desired.

An example of a conventional hermetic electric compressor will be described below with reference to the drawings.

2 and 3 are a cross section and a longitudinal section of a conventional hermetic electric compressor (hereinafter referred to as a compressor) shown in Japanese Patent Application Laid-Open No. 2-81970, where 1 is a hermetic container and 2 is eccentric part 3
4 is a cylinder, and 5 and 6 are airtightly closed both sides of the cylinder 4 to form a compression chamber (not shown).
7 is a roller that is loosely fitted to the eccentric portion 3 of the shaft 2 while maintaining an appropriate clearance and rotates while being in close contact with the inner wall of the cylinder 4, and 8 is a vane that forms the compressor. The chamber is divided into a high pressure chamber and a low pressure chamber (not shown).

Further, 9 is a pen groove into which the vane 8 provided on the cylinder 4 is inserted with an appropriate clearance.

In the above configuration, when the shaft 2 rotates, the roller 7 in the cylinder 4 comes into close contact with the inner wall of the cylinder 4 and slides on the curved tip (not shown) of the pen 8. It rotates and repeats the suction and compression process of refrigerant. At this time, the vane 8 reciprocates in a vane groove 9 provided in the cylinder 4 in accordance with the eccentric movement of the roller 7.

Generally, the roller 7 is made of cast iron or wear-resistant Ni.
-Or-Mo cast iron is used, and the main bearing 5 and the sub-bearing 6 are made of cast iron with relatively good sliding characteristics.

Problems to be Solved by the Invention However, in the above configuration, when the roller 7 slides for a long period of time in the compression chamber or is used under severe usage conditions, the main bearing 6 and the sub-bearing 6 may be damaged. A soft ferrite layer in the cast iron covers the free carbon on the long surface, which is effective as a sliding property due to plastic flow, and the roller 7
Due to the high hardness of the roller 7, the sliding surfaces 1o of the main bearing 6 and the sub-bearing 6 with respect to the roller 7 are severely worn;
It had the problem of poor reliability.

In view of the above-mentioned problems, the present invention provides a high-performance and highly reliable compressor that minimizes the wear of the sliding surfaces 10 of the main bearing and the sub-bearing with the rollers even under severe usage conditions.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has the following features:
It is equipped with a main bearing and a sub-bearing that have been nitrided.

Effects According to the present invention, the hardness of the main bearing and the sub-bearing is increased by the above-described structure, and the wear resistance of the sliding surfaces of the main bearing and the sub-bearing can be increased even against the rotational movement of the highly hard roller.

EXAMPLE Hereinafter, a compressor according to an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a vertical cross-section of a main part of a compressor according to the present invention.

Reference numeral 21 denotes a nitrided layer formed on the surfaces of the main bearing 6 and the sub-bearing 6 by nitriding treatment.

In the above configuration, when the hard roller 7 rotates in the compression chamber, it is possible to improve the wear resistance against the sliding friction of the roller 7, and the sliding surface of the main bearing and the sub-bearing can be improved. 10 wear will be suppressed as much as possible.

Effects of the Invention As described above, the present invention improves the sliding performance of rollers by nitriding the main bearing and the sub-bearing, particularly by producing a hard nitrided layer on the sliding surfaces 10 of the main bearing and sub-bearing. As a result, it is possible to provide a high-performance, highly reliable compressor with less wear on the main pairing and auxiliary bearing sliding parts.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of essential parts of a hermetic electric compressor according to an embodiment of the present invention, Figure 2 is a cross-sectional view of a conventional hermetic electric compressor, and Figure 3 is a cross-sectional view of a conventional hermetic electric compressor. FIG. 1...Dense, 〒Container, 2...Shaft,
3... Eccentric part, 4... Cylinder, 5...
...Main bearing, 6...Subhair ring,
7...roller, 8...vane, 21.
−・・・Nitrided layer. Name of agent: Patent attorney Shigetaka Awano and one other person Z/! Stratification diagram′

Claims (1)

[Claims] A shaft having an eccentric part in a sealed container, a cylinder forming a compression chamber concentrically with the center of rotation of the shaft, a main bearing and a sub-bearing that airtightly close both sides of the cylinder, and attached to the eccentric part. a roller that rolls along the inner wall of the cylinder as the shaft rotates; and a vane that comes into contact with the outer periphery of the roller and partitions the compression chamber into a high pressure chamber and a low pressure chamber; A hermetic electric compressor characterized by having a nitrided layer.