Hitachi, Ltd.

Mitsuo Ikeda

Kazumi Aiba

Akira Murayama

Takao Mizuno

Naoshi Uchikawa

Takahiro Tamura

Tetsuya Arata

Hiroaki Kuno

Kiyoshi Fukatsu

A scroll-type fluid machine includes an orbiting scroll member and a stationary scroll member each of which has an end plate and a spiral wrap protruding upright therefrom. The scroll members are assembled together such that their wraps mesh with each other. Closed spaces are defined by the wraps and end plates of both scroll members, and are progressively moved towards the center of the scroll members while decreasing their volumes in accordance with an orbiting movement of the orbiting scroll member. The edges of the projecting end of the wrap of each scroll member are chamfered. Also, steps are formed in conformity with the configuration of each spiral wrap on respective corners of the groove bottom between adjacent turns of the wrap. The chamfered edges of the projecting end of the wrap of each scroll member faces the steps on the groove bottom of the opposing scroll member, respectively, when the scroll members are assembled together.

Scroll-type fluid machine with configured wrap edges and grooves

A method and an apparatus for automatically positioning stationary and orbiting scroll members of a scroll-type fluid machine. The method comprises temporarily positioning the scroll members; causing the orbiting scroll member to progressively orbit with respect to the stationary scroll member held at the temporary position and detecting, when wraps of the scroll members are made to contact each other, the degree of contact of the scroll wraps; detecting the direction of contact between both wraps when both wraps are made to contact each other; inputting the data concerning the degree of contact and the direction of contact to a computing means such as to move the stationary scroll member in X- and Y-axis directions by amounts corresponding to the degree and direction of contact, thereby to avoid the contact between the wraps of both scroll members; and, while the stationary scroll member is held at the position where the contact is avoided, inserting bolts to bolt holes formed beforehand in both scroll members, thereby fastening both scroll members.

Method of and apparatus for positioning compressor scroll member

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Shimizu, Japan

Mitsuo Ikeda