Hitachi, Ltd.

Hitachi Appliances, Inc

Hitachi Shimizu Engineering Co., Ltd.

Takao Mizuno

Naoshi Uchikawa

Akira Murayama

Takahiro Tamura

Hiroaki Kuno

Kenji Tojo

Hideyuki Ueda

Yoshikatsu Tomita

Masao Shiibayashi

Mutsunori Matsunaga

Tetsuya Arata

Naomi Hagita

Takeshi Hida

Sumihisa Kotani

Atushi Amata

Isao Hayase

Kazutaka Suefuji

Takeshi Tsuchiya

Eiichi Hazaki

Isamu Tsubono

Kazuo Sakurai

Masashi Miyake

Masaru Ohtahara

Yasushi Izunaga

Kazuyuki Fujimura

Kazumi Aiba

Kiyoshi Fukatsu

Kimio Nagata

Syunsuke Yasunori

Mitsuo Ikeda

Ryoichi Kuroshima

Mutsumi Otsuka

Katsuya Ohashi

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

A horizontal type scroll compressor is provided with a support plate separating an inside of the sealed container into a first space in which the compressor mechanism portion and the electric motor portion are stored, and a second space in which the discharge pipe is provided, and a communication path communicating a bottom portion of the first space and a space above the drive shaft within the second space in a lower side of the support plate, and regulates an oil level by the communication path in the case that the oil level difference becomes large at a time of a high-speed operation. In order to stabilize the oil supply to the bearing or the like, the oil is supplied by an oil pump provided in a shaft end portion of the drive shaft close to an oil reserving chamber.

Horizontal type scroll compressor including a first space and a second space

A second frame is arranged between a first frame and an orbiting scroll, and a central space and an outer peripheral space are sealed off by a seal portion, which is formed between an end surface of a shaft support of the orbiting scroll and the second frame. Also, a balance weight is arranged in a space between an underside of the second frame and the first frame. Thereby, most of an oil having lubricated respective shaft supports flows into the space below the second frame, and the oil accumulated in the space is discharged through an oil scavenge pipe into an oil reservoir in a lower portion of a closed vessel. Also, since the balance weight can be assembled from a side of the orbiting scroll in a state, in which the second frame is removed, it is possible to mount the balance weight close to the orbiting scroll.

Scroll fluid machine

The refrigerating apparatus of the invention has a scroll compressor having a compressing section sucking and compressing a hydrofluorocarbon-based refrigerant, a condenser and the like, in which a plain bearing slidably supporting a driving shaft driving the compressing section of the scroll compressor is made of a material containing lead, and an ether oil miscible with the refrigerant used in a refrigerant circuit is used as a lubricant for lubricating the plain bearing.

Refrigerant compressor and refrigerating apparatus

A lubricating construction of a scroll compressor includes a seal member provided between an orbiting scroll and a main frame to isolate a back pressure chamber from bearing portions to thereby keep the bearing portions substantially under a discharge pressure, a first oil feed passage extending from a lubricating oil portion under the discharge pressure to a space, disposed adjacent to an end of a crank portion of the crankshaft, through the crankshaft, a second oil feed passage extending from the above space to be opened to sliding portions of end plates of the orbiting and stationary scrolls through the end plate of the orbiting scroll, and communicating with the back pressure chamber, and a third oil feed passage extending from midway the first oil feed passage to be opened to an outer peripheral surface of the crankshaft, and serving to supply a lubricating oil to a main bearing portion by the use of a centrifugal pumping action produced by rotation of the crankshaft. The second oil feed passage has midway a throttle portion of a reduced flow passage area. This lubrication construction supplies the lubricating oil, using the pressure differential and the pumping action in combination.

Scroll compressor

A scroll type compressor having high efficiency and high reliability is obtained by preventing leakage of a compression chamber, increasing air tightness thereof and securing a smooth motion of an orbiting scroll member. A second frame member supported by a first frame member and slightly movable in the axial direction is disposed in the rear of an orbiting scroll member. Force is applied to the rear of the second frame member, and a slight axial movement of the orbiting scroll member is regulated by a fixed scroll member and the second frame member. As a result, both the scroll members are in tight contact or close to each other with a small space, and a smooth movement thereof can be secured, which makes it possible to obtain a scroll type compressor having high efficiency and high reliability.

Scroll type fluid machine having first and second frame members to

An overheating prevention method for a fixed displacement type compressor having an overheating prevention device for introducing a part of high pressure liquefied coolant, liquefied in a compressor of a refrigeration cycle, into a compression chamber maintained under a compression stroke of the compressor through a connecting pipe, and for controlling a flow rate of the liquefied coolant flowing through the communication pipe to thereby cool the compressor. The connecting pipe is communicated with the compressor so that an average pressure within the compressor is reduced relative to a condensed pressure under a minimum operational pressure ratio condition at which the introduction of the liquefied coolant is required for cooling the compressor, within an operational pressure range in which the condensed pressure and evaporation pressure are respectively variable. The high pressure liquefied coolant may be introduced into the compression chamber, kept under the compression stroke, from a plurality of positions.

Overheat preventing method for prescribed displacement type compressor

A refrigeration cycle apparatus wherein a positive displacement type compressor is used as a cooling medium compressor, and part of a high-pressure liquid cooling medium liquefied in a condenser of a refrigeration cycle is introduced into a compression chamber of the compressor during a compression stroke thereof via first and second connecting pipes connected to the compressor, thereby preventing the overheating of the compressor. The position of connection of the first connecting pipe to the compressor is set to such a position of the compression chamber that when an operating pressure ratio requiring the cooling of the compressor is minimum, the pressure within the compression chamber of the compressor during the compression stroke can be below a condensation pressure at the operating pressure ratio. The position of connection of the second connecting pipe to the compressor is set to such a position of the compression chamber that the pressure within the compression chamber during the compression stroke can be above the pressure within the compression chamber communicated with the first connecting pipe. The second connecting pipe is normally opened, and control means is provided for controlling the opening and closing of the fist connecting pipe so as to keep the temperature of the compressor below a predetermined allowable temperature during the operation of the compressor.

Refrigeration cycle apparatus

A scroll compressor comprising a housing, a frame, a fixed scroll and an orbiting scroll, arranged in the housing. Each of the fixed and orbiting scrolls have an end plate and a spiral wrap. A bearing boss is formed on the back surface of the end plate of said orbiting scroll. A plurality of radial ribs are formed on the back surface of the end plate of said orbiting scroll, with the radial ribs extending from the bearing boss to the marginal side of the end plate of said orbiting scroll.

Scroll compressor with reinforcing ribs on the orbiting scroll

In a scroll compressor having a stationary scroll and a revolving scroll, and a refrigerator incorporating this scroll compressor, the stationary scroll has a gas suction hole formed in its radially outer portion, a gas discharge hole formed in its central portion, and gas injection holes and a liquid injection hole formed between the suction and discharge holes. The gas injection holes are formed in a radially outer portion of the stationary scroll, and the liquid injection hole are formed in a central portion of the stationary scroll. The refrigerator incorporates the scroll compressor, a condenser, decompressors and an evaporator to form a refrigerating circuit. The liquid injection hole of the scroll compressor is directly connected by piping to the outlet of the condenser, and the gas injection holes are connected by piping to the outlet of the condenser through one of the decompressors. Even though the compressor is a single-stage compressor having one compression unit and one electric motor unit, the reduction in the volumetric efficiency can be limited and the power necessary for compression during practical use is substantially the same as the power for the two-stage compression type. Consequently, the compressor of the invention has substantially the same compressor efficiency as the conventional two-stage compressor at evaporation temperatures of -45.degree. to -70.degree. C.

Scroll compressor and scroll-type refrigerator

A scroll compressor comprises an orbiting scroll and a fixed scroll, each of which has a wrap formed on an end plate in upstanding position. These orbiting and fixed scrolls are assembled together with the wraps facing inwardly to each other so as to define a plurality of spaces by the wraps and the end plates of both scrolls. These spaces move toward the center of both scrolls during the orbiting movement of the orbiting scroll so as to reduce the respective capacities of the spaces. Thus, compression of a fluid is carried out. This compressor also includes a motor for driving the orbiting scroll and a driving shaft for connecting the orbiting scroll and the motor. At the end of the driving shaft on the motor side, a first oil supply pump is provided with its suction port communicating to an oil sump of the compressor. Also, a second oil supply pump communicating with the discharge side of the second oil supply pump is provided at the end of the driving shaft on the compressor section side, whereby the oil supply pump of the compressor is made of a multistage type.

Scroll compressor with first and second oil pumps in series

A scroll-type fluid machine for an air conditioning machine comprises a hermetically closed vessel which houses therein an orbiting scroll member and a stationary scroll member forming together a compressor portion, an Oldham ring member for preventing the orbiting scroll member from rotating about its own axis, a driving motor having a driving shaft connected to the orbiting scroll member for driving the same, and a frame for supporting the shaft, a low pressure liquid introducing passage for making the interior of the hermetically closed vessel a low pressure chamber, and a high pressure fluid discharge passage. A sealing member is provided at the back of the orbiting scroll member with its surfaces slidably contacting the frame and the orbiting scroll member to form a chamber separated from the low pressure chamber. A fluid which is in mid course of being compressed and has an intermediate pressure between suction pressure and discharge pressure is introduced into the separated chamber to maintain the same at the intermediate pressure, thereby overcoming a thrust force exerted on the orbiting scroll member to press the same against the stationary scroll member and effecting a proper supply of lubricating oil to moving portions of the machine.

Scroll-type fluid machine with seal to aid lubrication

The scroll type compressor has a hermetic casing, and a scroll compressor section and an electric motor section which are contained within the hermetic casing. These compressor and electric motor sections are fitted through a frame in the hermetic casing. In a portion of the frame intermediate between the compressor and the electric motor section, a plurality of segmented concave spaces are defined. At an upper portion in the hermetic casing, a discharge space which communicates with a discharge port of the scroll compressor section is defined. Further, in a portion of the casing between the compressor and the motor section, a delivery port which open to one of the concave spaces in the frame is provided. Furthermore, at least one fluid passage is provided in an outer periphery of the compressor section and this passage makes the discharge space communicate with the other concave spaces in the frame. A compressed gas from the scroll compressor section is introduced via the discharge space and the fluid passage into the concave spaces, and is introduced from the delivery port to the outside of the compressor after separating the oil contained within the compressed gas in these concave spaces.

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Shimizu, Japan

Takao Mizuno