Hitachi, Ltd.

Hitachi Appliances, Inc

Masao Shiibayashi

Kenji Tojo

Masato Ikegawa

Kazutaka Suefuji

Akira Murayama

Tetsuya Arata

Masaya Imai

Yasushi Izunaga

Takao Mizuno

Eiichi Hazaki

Naoshi Uchikawa

Hiroaki Kuno

Takahiro Tamura

Yoshiro Ibaraki

Yoshikatsu Tomita

Sumihisa Kotani

Jyoji Okamoto

Shigeru Machida

Takao Senshu

Katsuaki Kikuchi

Taisei Hosoda

Takamasa Adachi

Ryoichi Kuroshima

Katsuaki Yano

A suction chamber and the oil injection port are linked, under a certain range of revolution angle, via a suction working chamber formed in the radially outer side by a orbiting scroll outer curve and a fixed scroll inner curve under a certain range of revolution angle. An opening of the oil injection port is provided on a bottom surface between teeth of the fixed scroll so that the suction working chamber formed, in a radially inner side, by a orbiting scroll inner curve and a fixed scroll outer curve and the suction chamber are positioned not to be linked with the oil injection port.

Sealed scroll compressor for helium

In the hermetically sealed scroll compressor, an injection pipe for injecting a fluid to a compression chamber is connected to an injecting port of a fixed scroll. The injecting port includes a first injecting port which is provided in the vicinity of a fixed scroll inner curve and injects the fluid to an orbiting outer compression chamber, and a second injecting portwhich is provided in the vicinity of a fixed scroll outer curve and injects the fluid to a orbiting inner compression chamber. The second injecting port is placed in parallel in a radius direction with respect to the first injecting port and is placed so that an orbiting scroll wrap does not practically communicate with the orbiting outer compression chamber in the state in which the orbiting scroll wrap is in contact with the outer side of a fixed scroll wrap.

Hermetically sealed scroll compressor

Helium enclosed compressor. A compressor and a motor section with stator having coil ends and a rotor, are housed within an enclosed vessel partitioned into discharge and motor chambers by a frame. The compressor section has a stationary scroll having a spiral wrap standing upright at a disk-like panel and an orbiting scroll having a spiral wrap standing upright at a disk-like panel, made to mesh with each other while their wraps face the inside. The orbiting scroll sucks helium gas from a suction port of an outer peripheral portion of the stationary scroll, and discharges helium gas into the discharge chamber from a discharge port of a central portion of the stationary scroll. An inverter controls a number of rotations of the motor section, wherein a plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitutes the coil ends.

Helium enclosed compressor

Scroll compressor suitable for a low operating pressure ratio

A scroll compressor having an orbiting scroll member, a stationary scroll member and an Oldham's ring. The stationary scroll member is made of a material having a higher rigidity than the material forming the orbiting scroll member, and a higher density as well as a lower thermal conductivity than any of the materials forming the orbiting scroll member and the Oldham's ring.

Scroll compressor with a stationary and orbiting member of different

A scroll compressor comprising a stationary scroll member having a stationary spiral wrap extending from a stationary end plate, an orbiting scroll member having an orbiting spiral wrap extending from an orbiting end plate with the wraps of the stationary scroll member and orbiting scroll member engaging with each other to form a fluid compressing chamber. A main shaft rotates on its own axis, with an eccentric drive shaft being provided having an axis spaced from the axis of the main shaft to orbit around the axis of main shaft and so that the eccentric drive shaft drives the orbiting scroll member to orbit around the axis of the stationary scroll member. The eccentric drive shaft is guided on the main shaft so that a distance between the axis of eccentric drive shaft and the axis of main shaft can be changed, and the main shaft drives the eccentric drive shaft to orbit around the axis of the main shaft. A balance is connected to the eccentric drive shaft, with a center of gravity of the balance weight being spaced from the axis of main shaft so that the centrifugal force of the balance weight draws the eccentric drive shaft toward the main shaft. An arrangement is provided for pushing the eccentric drive shaft away from the main shaft.

Scroll compressor having changeable axis in eccentric drive

A scroll fluid machine in which a stationary scroll member and an orbiting scroll member each have an end plate and involute wrap on said end plate and mesh with each other. A winding-start portion of the wrap has such a section such that a base thereof is thick and the tip thereof is thin, with a curve of an inside line at each of the bases of the wraps is made as thick as possible while avoiding mutual interference between the wrap of fixed scroll member and the wrap of orbiting scroll member. A curve of an inside line at each of tips of the wraps has such a shape that it gradually thinned toward an inner periphery end thereof, and a section of each wraps in the wrap axial direction has such a shape that it is gradually reduced in thickness from the base toward the tip.

Scroll fluid machine having wrap start portion with thick base and thin

A scroll compressor is provided with a two groups of commmunication ports formed in and extending through an end plate of a stationary scroll member. Each group includes two or more communication ports. A lead valve is associated with each of the two groups of communication ports and is operable by a pressure differential in between an associated compression chamber and the discharge chamber to communicate the communication ports of the group to the discharge chamber to prevent the occurrence of over-compression in the compression chamber.

Scroll compressor with valved port for each compression chamber

An oil feeding device for a scroll fluid apparatus. A fixed scroll member is associated with an orbiting scroll member. A crankshaft rotatably supported by a bearing of a frame has a crank portion engaging with a plain bearing of the orbiting scroll member. A variable speed driving motor is connected to the crankshaft. An oil feeding passageway is provided in the crankshaft and the crank portion. Oil is supplied to the plain bearing of the orbiting scroll member through a space at the end face of the crank portion. An oil flow passage is provided in parallel with the axis and in a surface of the crank portion located at a position advanced through approximately 45 degrees toward the rotational direction of the crank portion, from a position at which the load acting radially of the shaft due to the centrifugal force caused by the orbiting motion of the orbiting scroll member is applied to the crank portion of the shaft.

Oil feeding device for scroll fluid apparatus

A hermetic scroll compressor has a scroll compressor section, a motor section and a hermetic casing which encases the compressor and motor sections. The space in the casing is divided into an upper chamber and a lower chamber by a frame by which a shaft interconnecting the compressor and motor sections is rotatably supported. The upper and lower chambers are communicated with each other through a communication passage which is formed in the outer periphery of the frame. The hermetic casing is composed of an upper section, a barrel section and a lower section which are welded together. The barrel section is formed by rolling a sheet into a cylindrical form and welding opposing ends of the rolled sheet so as to form a weld seam joint. The frame is fixed in the casing with the weld seam joint disposed within the circumferential width of the communication passage, so that the outer periphery of the frame is in tight contact with the inner periphery of the barrel section except for the portion where the communication passage is formed.

Hermetic scroll compressor with welded casing section

A scroll-type compressor for compressing helium gas includes stationary and orbiting scroll members each having an end plate and a spiral wrap, with the scroll members being assembled together to define compression spaces therebetween. A driven main shaft driven by has an eccentric mechanism engageable with the orbiting scroll member to cause an orbiting movement of the orbiting scroll member with respect to the stationary scroll member while preventing the orbiting scroll member to rotate about its own axis. The orbiting movement of the scroll member causes a radially inward movement of the compression spaces while progressively decreasing the volumes of the compression spaces, whereby the helium gas sucked through a suction port of the stationary scroll member is progressively compressed finally discharged from a discharge port. An oil injection system includes at least one oil injection port formed to open in the surface of the end plate of the stationary scroll member and injects an oil into the helium gas under compression in order to cool the same. The size of the oil injection port as measured in the direction of thickness of the scroll wrap is greater than the thickness of the scroll wrap of the orbiting scroll member.

Scroll-type compressor for helium gas

A scroll fluid machine has a stationary scroll member and an orbiting scroll member each having an end plate and a spiral wrap. At least one oil injection port and at least one oil relieving passage is formed in the end plate of either one of the scroll members. The oil injection port opens into at least one of the enclosed spaces, while the oil relieving passage provides an intermittent communication between that enclosed space and a space or chamber of an intermediate pressure formed by the scroll members which includes a suction chamber.

Scroll fluid machine with oil injection part and oil relieving passage

A scroll fluid apparatus including a fixed scroll member and an orbiting scroll member each having an end plate and a wrap, the two scroll members being maintained in meshing engagement with each other with the respective wraps facing inwardly to allow the orbiting scroll member to move in orbiting movement with respect to the fixed scroll member without rotating on its own axis. The fixed scroll member is formed with a discharge port at its central portion and a suction port at its outer peripheral surface to draw a gas by suction through the suction port and allow same to flow in a sealed space defined between the two scroll members and reducing its space during operation to thereby compress the gas and discharge the compressed gas through the discharge port. A clearance is defined between an outer peripheral surface of the end plate of the orbiting scroll member and a wall facing the outer peripheral surface and successively changing its volume as the orbiting scroll member moves in orbiting movement, and at least one pressure relieving space is provided to communicate with the clearance for conveniently discharging a fluid from the clearance to avoid compression of the fluid.

Scroll fluid apparatus

A scroll-type fluid machine having a stationary scroll member and an orbiting scroll member each of which includes a disc-like end plate and a spiral wrap extending axially from one side of the end plate, with the wraps of the scroll members meshing with each other to define therebetween closed compression chambers. The orbiting scroll member is disposed between the end plate of the stationary scroll member and a frame of the machine with a back clearance between the other side of the end plate of the orbiting scroll member side thereof and the opposing surface of the frame. The orbiting scroll member is driven to make an orbiting movement with respect to the stationary scroll member so that the compression chambers are progressively moved towards the center of the scroll members while decreasing their volumes, to thereby suck a fluid through a suction port in the stationary scroll member and compress the same to discharge the compressed fluid through a discharge port formed in the stationary scroll member. The radial clearance between the wraps of both scroll members is selected to meet a specific condition so as to avoid mutual contact between the wraps of the scroll members even when the orbiting scroll member is inclined with respect to the horizontal plane.

Growing community of inventors

Shimizu, Japan

Masao Shiibayashi