Hitachi, Ltd.

Kazumi Aiba

Mineo Takahashi

Mitsuo Ikeda

Masami Suzuki

Akira Murayama

Takao Mizuno

Naoshi Uchikawa

Takahiro Tamura

Tetsuya Arata

Hiroaki Kuno

Yutaka Imaizumi

Minoru Sato

Kiyoshi Fukatsu

Minoru Tanikawa

Toshikazu Niwa

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

A method of processing a scroll member having a spiral wrap and an end plate which is conducted by effecting a shaving on at least one side surface of the spiral wrap by a tool while applying to the tool both of an axial small force and an ultrasonic oscillation simultaneously. An apparatus is proposed which comprises a shaving tool having a spiral groove of the same configuration as the spiral wrap, and a cutting edge portion formed on at least one side edge of the groove over the entire length of the side edge. A tool supporting device supports the shaving tool, and a blank supporting device supports a scroll blank such that the scroll blank opposes to the shaving tool. A device is connected to the tool supporting means and is adapted to impart to the tool a pressing force necessary for effecting the shaving, and an ultrasonic oscillation generating device is adapted to impart an ultrasonic oscillation to one of the tool or the blank.

Method of and apparatus for processing a scroll member for a scroll type

An improved method of producing a scroll type compressor having an orbital scroll member and a stationary scroll member. The orbital scroll member is fabricated by a process comprising the steps of: forming an end plate and a spiral wrap separately, the end plate being composed of an upper half part having a discontinuous joining portion for joining the spiral wrap and a lower half part having an oil passage. The upper half part and the lower half part of the end plate are fixed to each other through mutual engagement between locating projections formed by a plastic work on one of the half parts and mating holes formed in the other of the half parts. The stationary scroll member is produced by a process similar to the process used in fabricating the orbital scroll, comprising the steps of: forming an end plate and a spiral wrap separately, the end plate being punched from a sheet blank; forming a discontinuous joining portion on one side of the end plate; joining the spiral wrap to the end plate at the discontinuous joining portion; joining the end plate to one end of a sleeve; and joining a flange to the other end of the sleeve. The discontinuous joining portion may be constituted by a plurality of projections formed to project from the surface of the end plate, or may include a plurality of grooves or recesses formed in the surface of the end plate and projections formed on the end surface of the wrap at positions corresponding to the grooves or recesses.

Method of producing scroll type compressor

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Shimizu, Japan

Kazumi Aiba