Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.

Katsuhiro Fujita

Makoto Takeuchi

Takayuki Kuwahara

Kazuhide Watanabe

Tetsuzou Ukai

Hiroshi Yamazaki

Tomohisa Moro

Takayuki Hagita

Takahide Itoh

Hajime Sato

Genta Yoshikawa

Takahide Ito

Takamitsu Himeno

Yasuharu Maruiwa

Norio Hioki

Yasuhiro Wada

Shigeki Miura

Koji Terasaki

Hiroshi Ogawa

Masahiro Kato

Yukio Michishita

Takuma Yamashita

Masahiro Ohta

Tetuzou Ukai

Tetsuzo Ukai

Masafumi Hamasaki

Hideki Suetake

Hirohumi Hirata

Takaharu Maeguchi

Masaki Kawasaki

Kou Tanaka

Koryo Shibahara

Hideshi Hamamura

Yukihiro Kawai

Hiroshi Yamakazi

A scroll compressor comprising a fixed scroll (); an orbiting scroll () supported in a manner allowing for orbiting motion; a discharge port through which a fluid compressed by the two scrolls () is discharged; an end plate step portion (E) provided on an end plate of the orbiting scroll () formed so that a height of the end plate is higher on a center portion side in the direction of a spiral wrap and lower on an outer end side; and a wrap step portion (E) provided on a wall portion of the fixed scroll () that corresponds to the end plate step portion (E) so that a height of the wall portion is lower on the center portion side of the spiral and higher on the outer end side; wherein the orbiting scroll () is treated for surface hardening and the fixed scroll () is not treated for surface hardening.

Scroll compressor including fixed and orbiting scroll having stepped portions and a surface hardened treatment

In the present invention, a fixed scroll (A) comprises a lubricating oil introduction passage () that serves as a first passage for supplying, to the inside of a scroll compressor part (), a lubricating oil located inside an oil separator that serves as a lubricating oil separation part. An orbiting scroll (B) comprises a lubricating oil discharge passage () that serves as a second passage for discharging, to the outside of the scroll compressor part (), the lubricating oil which has been introduced to the inside of the scroll compressor part ().

Scroll compressor

Scroll compressor including fixed and orbiting scrolls having different heights and surface hardenings

One of a pair of a fixed scroll and an orbiting scroll is the scroll including a step portion provided only at a predetermined position along a spiral direction on a blade bottom surface of a spiral wrap, and the other one of the scrolls is the scroll including a step portion provided only at a predetermined position along a spiral direction on a blade tip surface of a spiral wrap. A blade bottom surface of an end plate of the fixed scroll is set as a reference surface for setting a chip gap between both the scrolls. When a wrap height of the spiral wrap of the orbiting scroll is represented by (L) (Lo, Li) and a wrap height of the spiral wrap of the fixed scroll is represented by (lo, li), L (Lo, Li)&#x3e;1 (lo, li) is satisfied.

Scroll fluid machine including a pair of fixed scrolls and an orbiting scroll

A method for manufacturing a compressor scroll that appropriately impinges cavitation bubbles on target regions of a scroll. The method includes the step of water jet peening by jetting cavitation bubbles generated underwater by a water jet at a first side of an end plate (A) of the scroll (), with a center (P, P, P) of the cavitation bubbles being offset from a center (O) of the spiral shape of a wall portion (B) on the end plate (A) and the step portion (Aa) and the stepped portion (Ba) positioned at an outer peripheral portion of the cavitation bubbles (C).

Method and device for manufacturing compressor scrolls, compressor scroll, and scroll compressor

An object of the present invention is to achieve favorable sealability by a simple and low-cost structure using an O-ring. A sealing structure according to the present invention is provided with: a first sealing surface formed in an annular shape on a first container structural member configuring a housing (container); a second sealing surface overlaid on the first sealing surface, formed in annular shape on a second container structural member configuring the housing; a plurality of concentric O-ring grooves formed on at least one of the first sealing surface and second sealing surface; and a plurality of O-rings fitted into the plurality of O-ring grooves. The filling ratio of the O-ring in the O-ring groove positioned on an outer side of the housing is larger than the filling ratio of the O-ring in the O-ring groove positioned on an inner side of the housing.

Sealing structure for airtight container and vehicle refrigerant compressor provided with said structure

In a scroll compressor that forms two suction volume parts by engaging paired fixed scroll and turning scroll with each other while scroll laps respectively erected on end plates of the fixed scroll and the turning scroll are opposed to each other and driving the turning scroll to revolve around the fixed scroll, out of the two suction volume parts, one of the suction volume parts that is formed close to a suction port provided in a housing is made larger than the other suction volume part.

Scroll compressor with step

A scroll compressor is provided that can reliably prevent a situation in which a product whose performance is degraded due to misassembly of a tip seal is shipped. In the scroll compressor, tip seals of different lengths are embedded in tip surfaces of a fixed spiral wrap of a fixed scroll and an orbiting spiral wrap of an orbiting scroll. Among the tip seals, thicknesses of the shorter tip seals are made thicker than thicknesses of the longer tip seals, and depths of seal grooves in which the tip seals are embedded, respectively, are formed to different depths in correspondence with the thicknesses of the respective tip seals.

Scroll compressor having tip seals of different lengths having different thickness or widths

A scroll compressor that suffers no decrease in compression performance due to leakage resulting from a twisting assembly error is provided. This scroll compressor includes a fixed scroll and an orbiting scroll, each including a spiral wrap protruding from an end plate and having the same tooth thickness (Tr) and the same base-circle radius (b) defining an involute surface. The fixed scroll and the orbiting scroll are offset from each other by an orbiting radius (&#x3c1;) and mesh such that the respective wraps face each other with a phase shift of 180&#xb0;. The orbiting scroll revolves/orbits along a circular orbit with the orbiting radius (&#x3c1;) to compress a gas while a rotation-preventing mechanism prevents rotation of the orbiting scroll.

Scroll compressor having an allowable angle of rotation

Provided is a scroll fluid machine that, by using a crankshaft manufactured by cold forging and a needle bearing, can sufficiently exhibit the performance of a variable circling radius mechanism, can provide a sufficient reliability on a bearing portion of the crankshaft, and can be manufactured inexpensively. For this purpose, in a crankshaftused for a driving force transmission system, a reinforced shaft unitand a circular column-like large diameter unitare formed at an end of a rotating shaft, a material is produced by a cold forging process so that an eccentric shaftprojects from the circular column-like large diameter unit, the circular column-like large diameter unitis rotatably coupled to a housingvia a needle bearing, and the variable circling radius mechanism is stably operated with rigidity increased by the reinforced shaft unit

Scroll fluid machine with cold forged eccentric crankshaft

To provide a scroll compressor capable of reducing a noise occurring in a pin-and-ring type self rotation preventing mechanism and improving compression performance. In a scroll compressor comprising: a fixed scroll member and a revolving scroll member; a driven crank mechanism for driving the revolving scroll member to revolutionary turn; and a pin-and-ring type self rotation preventing mechanism provided in plural places for preventing self rotation of a revolving scroll member, at least one of the self rotation preventing pin, the self rotation preventing ring and the self rotation preventing ring hole, which form the pin-and-ring type self rotation preventing mechanism, is provided with an orbit correction part for reducing a maximum displacement R in a direction of self rotation of the revolving scroll member to smooth a change of an orbit of the revolving scroll member in changing a pin and a ring in a section of prevention of self rotation by means of a corresponding pin and ring part.

Scroll compressor with improved rotation prevention mechanism

In a scroll compressor, a center of a turning scroll body is shifted with respect to a drive central axis so that a distance between a gravity center and the drive central axis in a turning scroll becomes smaller than a predetermined allowable value set based on theoretical displacement and mass of the turning scroll. A moment force about the drive central axis acting on the turning scroll is reduced during revolving, and an alternating force acting on an autorotation preventing pin in the turning scroll is reduced to an allowable level.

Scroll compressor having a shifted gravity center

In a scroll compressor configured to be capable of three-dimensional compression in a circumferential direction and a height direction of spiral wraps, in which top surfaces and bottom surfaces of spiral wraps (B andB) are provided with step portions (E andE) and the wrap height on the outer peripheral side of the step portion is made higher than the wrap height on the inner peripheral side, back-pressure introducing portions (and) where gaps between the back surfaces at step-portion ends of tip seals and groove bottom surfaces of tip seal grooves are made larger than a gap at the other portion are formed between the step-portion ends of tip seals (and) provided on top surfaces (G andG) on the outer peripheral side of the spiral wraps and tip seal grooves (L andL) to which the tip seals are fitted.

Scroll compressor for preventing performance deterioration and variation due to gas leakage

A scroll compressor includes a fixed scroll and an orbiting scroll, each including a spiral wrap protruding from an end plate and having the same tooth thickness (Tr) and the same base-circle radius (b) defining an involute surface. The fixed scroll and the orbiting scroll are offset from each other by an orbiting radius (&#x3c1;) and mesh such that the respective wraps face each other with a phase shift of 180&#xb0;. The orbiting scroll revolves/orbits along a circular orbit with the orbiting radius (&#x3c1;) to compress a gas while a rotation-preventing mechanism prevents rotation of the orbiting scroll. The relationship between the involute surfaces of the spiral wraps of the two scrolls and the dimensions, dimensional tolerance, and assembly standards of the rotation-preventing mechanism are determined so that the median value of an allowable angle of rotation (&#x3c6;) agrees with an upright position of the orbiting scroll.

A scroll compressor includes an orbiting scroll engaged with a front case by pins and rings or ring holes to prevent rotation of the orbiting scroll. The rings or the ring holes have such an inside diameter that an orbiting radius defined by the pins and the rings or the ring holes is larger than a theoretical orbiting radius defined by engagement between gear surfaces of a fixed scroll and the orbiting scroll. The pins, the rings, or the ring holes are shifted in such a direction as to relieve twisting of the orbiting scroll relative to the fixed scroll.

Growing community of inventors

Aichi, Japan

Katsuhiro Fujita