Hitachi, Ltd.

Mineo Takahashi

Kazumi Aiba

Masami Suzuki

Naoshi Uchikawa

Takao Senshu

Shinjiro Ueda

Akira Arai

Sigeaki Kuroda

Yutaka Imaizumi

Masamichi Hanada

Minoru Sato

Minoru Tanikawa

Hiromu Watanabe

Toshikazu Niwa

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

In a scroll fluid compressor including orbiting and stationary scroll members having end plates and wraps in vortical form in upstanding positions on the end plates meshing with each other to define therebetween spaces for compressing a fluid introduced through an inlet line and discharging the compressed fluid through an outlet line, flat plates in vortical form having surface finishes of higher precision than the end plates are placed in valleys between the outer wraps and the inner wraps of the scroll members to enable the wrap of the orbiting scroll member to move in orbiting movement while having the forward ends of the wraps in sliding contact with the surfaces of the flat plates in vortical form. Stepped portions may be formed on the bottoms of the valleys to hold the flat plates in vortical form in place, or space may be provided between the flat plates in vortical form and the bottoms of the valleys to be filled with a filler material from outside through ducts formed in the end plates, to bond the flat plates in vortical form to the end plates to enable the forward ends of the wraps to be maintained in uniform contact with the flat plates in vortical form.

Scroll fluid compressor with surface finished flat plates engaging the

A centrifugal blower including a casing formed with a discharge port and a suction port, and an impeller mounted in the casing and having a plurality of backwardly curved vanes arranged circumferentially of the impeller. The suction port has a semicircular suction member located in spaced juxtaposed relation to a semicircular curled portion formed at the forward end of a shroud of the impeller. An annular guide plate may be attached to the inner side of the suction member and formed at its open end with a wall portion disposed along the shroud which is formed at its forward end with an annular wall extending into a space defined between the suction member and the guide plate. Hair may be provided on one of opposed wall surfaces of the suction member and the annular wall of the shroud.

Blower

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Shimizu, Japan

Mineo Takahashi