Hitachi, Ltd.

Shimizu Engineering Co., Ltd.

Akira Murayama

Naoshi Uchikawa

Takao Mizuno

Takahiro Tamura

Hiroaki Kuno

Tetsuya Arata

Kazutaka Suefuji

Masao Shiibayashi

Sumihisa Kotani

Eiichi Hazaki

Takao Senshu

Yoshikatsu Tomita

Jyoji Okamoto

Kenji Tojo

Katsuaki Kikuchi

Fumio Harada

Kiyoshi Fukatsu

Ryoichi Kuroshima

Susumu Nakayama

Masato Itagaki

Kazuo Sakurai

Toshiaki Koyama

Yasushi Izunaga

Sigeaki Kuroda

Fumio Yoshinaga

Masatoshi Muramatsu

Kazumi Aiba

Yasuro Ohishi

Shintaro Sado

Mitsuo Ikeda

Hiroyuki Imamura

Masahisa Sofue

Masao Shibayashi

Minoru Tomono

Toshio Hirai

Tadao Ochiai

Tadashi Fukuishi

Shouji Kikuchi

A scroll type compressor having a pair of scroll type compression units which are encased in the same casing so as to make a common use of a lubricating oil reservoir provided in the casing, wherein the compression units have compression elements, drive shafts, driving motors and other components which are of the same constructions and specifications, and wherein each of the compression units are adapted to be driven selectively by commercial electrical power or through a frequency-variable inverter so as to operate at different speeds. Since both compression units can be made up from the same components such as the compression elements, loads in the production, service and administration, are greatly reduced contributing to a reduction in the labor and cost, while eliminating any mounting error. Various operation patterns are obtainable by selecting the combination of the direct commercial power and the power supplied through the inverters, so as to provide delicate control of refrigeration capacity over a wide range in accordance with the level of the load demand. Common use of the lubricating oil reservoir by both compression units eliminates necessity for specific measure for preserving oil levels equally for both compression units.

Scroll type compressor and refrigeration cycle using the same

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

An air conditioner provided with a refrigerant circuit formed by connecting with piping a refrigerant compressor, a condenser, an expansion means and an evaporator, an inverter power supply means for controlling the rotational speed of an electric motor for driving the refrigerant compressor, a load detector, and a controller for controlling the inverter power supply means on the basis of an output from the load detector. A refrigerant flow passage controlling mechanism is provided to change the rate at which the refrigerant flows through the condenser on the basis of a control command from the controller, thereby making it possible to reduce or increase the discharge rate without extending the range of changes in the rotational speed of the compressor. The compressor can be controlled according to a wide range of changes in the load to operate with an operation range which ensures high efficiency of the compressor operation.

Capacity-controllable air conditioner

A scroll-type fluid machine comprises a stationary scroll member, an orbiting scroll member, a rotation-prevention mechanism for the orbiting scroll member, and a casting accommodating therein both members and the mechanism. The involute angle of a terminal end of a wrap of the orbiting scroll member is selected to be less than that of the wrap of the stationary scroll member by an angle which ranges between 60.degree. and 120.degree., preferably, about 90.degree., thereby reducing a level of force applied to the rotation-prevention mechanism which prevents the orbiting scroll member from rotating about its own axis.

Scroll-type fluid machine with different terminal end wrap angles

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

In a scroll compressor, an anti-rotation mechanism is interposed between a back surface of an end plate of an orbiting scroll member and a flat surface of a frame facing the back surface. A seal mechanism or a thrust bearing portion is provided on the surfaces of a disc member of the anti-rotation mechanism which are maintained in contact with the back surface of the end plate of the orbiting scroll member and the flat surface of the frame.

Anti-rotation mechanism for use with orbiting scroll member of scroll

An air conditioner includes a scroll-type refrigerant compressor driven at a speed variable in accordance with the thermal load on the air conditioner. The compressor has stationary and orbiting scroll members assembled together to define compression chambers in which a refrigerant gas is compressed and finally discharged into a discharger chamber through a discharge port formed in the center of the end plate of the stationary scroll member. At least one bypass port and an associated check valve are provided in and on the end plate of the stationary scroll member at such a position that the check valve opens to allow the gas to be directly discharged from an associated compression chamber into the discharge chamber when the compressor is operated under such a condition that the ratio of the operation pressure ratio to the design pressure ratio of the compressor falls within a range between 0.5 and 0.75.

Air conditioner or refrigerating plant incorporating scroll compressor

A sealed scroll compressor comprises a scroll compressor section, an electric motor, a sealed container, an oil storage, a fixed and orbiting scroll members, and a wire mesh member for improvement of oil separation in refrigerant gas. A shell portion of said sealed container is lined annularly with the wire mesh member and the gas containing oil is adapted to flow downwardly along the wire mesh member. When the gas flows downwardly, the oil sticks to the wire mesh member and is separated from the gas. The oil collected on the wire mesh member drops down into the oil storage. The gas from which the oil is separated is, after that, discharged out of the compressor.

Sealed type scroll compressor with wire mesh oil separating member

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 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.

Hermetic scroll compressor having concave spaces communicating with a

A scroll compressor comprises an orbiting scroll and a fixed scroll, each of which includes a spiral wrap. These orbiting and fixed scrolls define between their wraps a plurality of close spaces at symmetrical positions. These closed spaces are moved toward the center of the scrolls by means of orbital motion of the orbiting scroll relative to the fixed scroll for reducing their capacities to compress fluid confined therein. Upon starting the compressor, some of the spaces which are in mid course of compressing and the other closed spaces which locate at the downstream side just before the communication with a discharge port, are communicated with each other through valves which open when pressure in the closed spaces at the upstream side is higher than that in the closed spaces at the downstream side, whereby a loading torque upon starting is decreased.

Scroll compressor with closed compression spaces having valves to reduce

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 fluid machine includes an orbiting scroll member and a stationary scroll member each of which has an end plate and a spiral wrap protruding upright therefrom. The scroll members are assembled together such that their wraps mesh with each other. Closed spaces are defined by the wraps and end plates of both scroll members, and are progressively moved towards the center of the scroll members while decreasing their volumes in accordance with an orbiting movement of the orbiting scroll member. The edges of the projecting end of the wrap of each scroll member are chamfered. Also, steps are formed in conformity with the configuration of each spiral wrap on respective corners of the groove bottom between adjacent turns of the wrap. The chamfered edges of the projecting end of the wrap of each scroll member faces the steps on the groove bottom of the opposing scroll member, respectively, when the scroll members are assembled together.

Scroll-type fluid machine with configured wrap edges and grooves

A scroll compressor including a stationary scroll and an orbiting scroll, with an intermediate pressure chamber being defined on a back side of the orbiting scroll member and being in communication with a pressure chamber through a communication hole to produce a force for pressing the orbiting scroll against the stationary scroll. Oil in an oil sink is supplied to sliding portions by a differential pressure between a pressure in the air tight container and a pressure in the intermediate pressure chamber. A valve is provided for switching the connection of the intermediate pressure chamber to a higher intermediate pressure side or to a lower intermediate pressure side of the compressor. The valve is constructed such that the intermediate pressure chamber is connected to the lower intermediate pressure side of the compressor when a discharge pressure of the compressor is lower than a certain value and connected to the higher intermediate pressure side of the compressor when the discharge pressure is higher than a certain value so that a proper oil supply pressure is maintained over a wide operational range.

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Shimizu, Japan

Akira Murayama