Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Tetsuzo Ukai

Takahide Ito

Hiroshi Yamazaki

Yukio Nagato

Makoto Takeuchi

Katsuhiro Fujita

Takayuki Kuwahara

Kimiharu Takeda

Tomohisa Moro

Mikihiko Ishii

Yasuharu Maruiwa

Masumi Sekita

Katsumi Hirooka

Makoto Fujitani

Norio Hioki

Tetsuo Shigeoka

Hirohumi Hirata

Toshiyuki Shikanai

Koji Terasaki

Koryo Shibahara

Masaaki Tokuda

An object is to provide a scroll compressor capable of preventing degradation in performance and the occurrence of abnormal noise due to a torsional moment applied to an orbiting scroll, by utilizing the structural advantages of so-called stepped scroll compressors. In a so-called stepped scroll compressor (), in a pair of compression chambers () arranged in a point-symmetrical configuration among a plurality of compression chambers (), the volume Vof the compression chamber () formed on the ventral-surface side of the fixed spiral wrap (B) of the fixed scroll () when intake is cut off and the volume Vof the compression chamber () formed on the ventral-surface side of the orbiting spiral wrap (B) of the orbiting scroll () are different from each other.

Scroll compressor with stepped spiral wraps

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 includes a first scroll and a second scroll. The first scroll has a step portion that separates an elevated portion and a recessed portion of a surface of the first scroll. A spiral wall of the second scroll has a step that separates an elevated portion and a recessed portion of the wall. A first bypass hole is provided in the elevated portion of the surface of the first scroll. A second bypass hole is provided in the recessed portion of the surface of the first scroll. The second bypass hole is within 360 degrees toward a center of the spiral of the first scroll from an outer end of the spiral. The first bypass hole is within 360 degrees from the second bypass hole toward the center of the spiral.

Scroll compressor with bypass holes communicating with an intake chamber

Object: To provide a high performance scroll type fluid machine in which machining is facilitated, strength of central end portion of scroll wrap is high enough, volume of the innermost compression chamber becomes zero and yet compression efficiency does not lower. Solving means: A central end portion profile of spiral wrap of each scroll (1, 2) is formed in a step-like shape having at least two steps (1A, 1B and 2A, 2B), the central end portion profile of each said step is made in a complete engagement profile and thickness of said step-like spiral wrap is made thinner at the upper step leaving an end plate.

Scroll type fluid machine having spiral wraps formed in a step-like shape

A scroll fluid machine has a stationary scroll having a first end plate and a first spiral wrap projecting from one side of the first end plate. The first spiral wrap has a tip end. A swivel scroll has a second end plate and a second spiral wrap that projects from the one side of the second end plate. The second spiral wrap has a second end tip, and the first and second spiral wraps are engaged with each other. A first thin steel plate is provided on one side of the end plate between the first end plate and the second tip end. A first thin steel plate has a surface side that faces the second tip end. Further, a second thin steel plate is on one side of the second end plate between the second end plate and the first tip end. The second thin steel plate has a surface side that faces the first tip end. Both of the first and second thin steel plates are provided with conformable layers on the surfaces facing the tip ends. The conformable layers comprise a material that is softer than the first and second tip ends so that during operation a gap between the center portion of the tip ends and the opposite scroll end plate does not become too large. A leakage passage is provided in at least one of the thin plates so as to interconnect a central compression chamber formed by the spiral wraps and the outer circumferential chambers.

Scroll type fluid machine having a thin plate for each scroll

An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.

Fluid pump and rotary machine having said fluid pump

Growing community of inventors

Aichi, Japan

Tetsuzo Ukai