Matsushita Electric Industrial Co., Ltd.

Hideo Hirano

Hiroyuki Kawano

Hideto Oka

Masahiro Tsubokawa

Shuichi Yamamoto

Osamu Aiba

Yoshiyuki Futagami

Toshiharu Yasu

Shozo Hase

Taisei Kohayakawa

Takashi Morimoto

Shigeru Muramatsu

Sadayuki Yamada

Yoshinori Kojima

Jiro Yuda

Michimasa Hori

When sliding elements, slide bushings, vanes and Oldham rings employed in various types of refrigeration compressors and other applications meet the following conditions, they resist sticking to aluminum-base components, resist depletion of the oil film on slide faces, and exhibit excellent wear resistance. Firstly, the elements must comprise an iron-base sinter having closed cells on at least the slide face. Secondly, in order for the oil film to be maintained on the slide face by the closed cells and to enhance lubricating properties, the proportion of closed cells having circular-equivalent diameter of 10 &mgr;m or less, i.e. the number of &lE;10 &mgr;m cells/total number of cells, must equal 85% or more, and the opening area of the closed cells on the slide face must equal 5% or less. Finally, the sliding element density must be 7.3 g/cm,or higher.

Sliding member and refrigerating compressor using the same

A scroll compressor having an extended life due to the support structure for the orbiting scroll, even when using a chlorine-free substitution refrigerant. The support structure includes an Oldham ring for supporting an orbiting scroll so as to allow the orbiting scroll more orbiting motion without rotating about a fixing scroll. The Oldham ring is formed of a different material from both a fixing member and the orbiting scroll. Hence, if a boundary lubrication state occurs in mutually sliding parts, only sliding between different materials occurs, and mutual adhesion in the portion of the boundary lubrication state is avoided. As a result, the shortening of the life due to the wearing of the support structure of the orbiting scroll is prevented.

Scroll compressor and method for manufacturing an oldham ring therefor

A scroll compressor includes a fixed scroll and an orbiting scroll which define therebetween a plurality of compression chambers for compressing fluid introduced via a suction port. The orbiting scroll has a base plate and a shaft portion extending from the base plate toward a crankshaft rotatably supported by a support member. A seal member is disposed between the base plate and the support member to define an inner region and an outer region. The inner region surrounds the shaft portion, while the outer region includes therein a rotation preventing member interposed between the base plate of the orbiting scroll and the support member. The inner region communicates with the outer region via an oil-feed passage formed through the orbiting scroll. The oil-feed passage includes therein a restrictor and opens in the neighborhood of an upper sliding portion between the rotation preventing member and the support member. Thus, lubricating oil supplied to the inner region is fed to the neighborhood of the upper sliding portion via the oil-feed passage for lubrication thereof. The lubricating oil collects downward due to the gravity to achieve lubrication of a lower sliding portion between the rotation preventing member and the support member.

Scroll compressor having lubrication of the rotation preventing member

An orbiting scroll is engaged to and moved orbitally in relation to a fixed scroll at variable speeds. An offset surface is provided in at least one of the wraps of the fixed scroll and/or the orbiting scroll, by which a space S is created in one of the compression chambers formed between the fixed scroll and the orbiting scroll, which is thereby unsealed and opened to the inlet port side. The offset surface has a length from a position in the spiral length which satisfies the required compression ratio of one of the compression chambers in a low speed operation to the end of the spiral. An injection port is positioned such as to open to an unsealed area of this compression chamber, and gas injection shutoff and resumption is controlled through this injection port as appropriate to the situation.

Scroll type compressor

To present a compressor for refrigerating machine excellent in lubricating effect, small in wear of contact portions, outstanding in refrigerating performance, and high in reliability, in a compressor using HFC refrigerant not containing chlorine atom. A lubricating oil containing HFC refrigerant, an ester compound oil as principal component, and a phosphoric acid triester as extreme pressure additive is used. Moreover it is composed so that the surface hardness of a vane for composing the contact portions of the compressing mechanism and the surface hardness of the piston may have a difference of 10 or more in Rockwell hardness (HRC). As the extreme pressure additive, also, phosphite, phosphoric acid diester or phosphoric acid monoester can be used. As the principal component of lubricating oil, ether compound oil or carbonate compound oil is also usable.

Compressor for refrigerating machine

In a sealed-type scroll compressor having a stationary scroll member and an orbiting scroll member, the stationary scroll member is fixed after rotating it in an orbiting direction of the orbiting scroll member by a predetermined angle from a phase angle position where a possible orbiting radius between both scroll members is made maximum at the temperature before driving the scroll compressor.

Sealed-type scroll compressor and assembling method therefor

Sealed-type scroll compressor with relatively shifted scrolls based on

The compression capacity of a rotary compressor may be changed by a cylinder bypass system. The change of compression capacity is achieved by a slide wall member which composes part of an inside wall of a cylinder containing a compression mechanism and which is movable, thereby bypassing gas being compressed to a suction side of the compressor. The slide wall member is caused to slide forward by gas pressure applied and to slide backward by a spring force. By controlling such gas pressure, the capacity of the compressor may be changed. A relatively large opening is formed in the cylinder when the slide wall member is moved backward, so that the compression capacity can be greatly reduced without a large decrease in efficiency.

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Kusatsu, Japan

Hideo Hirano