Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Toshihide Koda

Shin Sekiya

Masayuki Kakuda

Masahiro Sugihara

Fumihiko Ishizono

Mihoko Shimoji

Toshiyuki Nakamura

Masaaki Sugawa

Kenji Yano

Kunio Tojo

Naoki Tanaka

Taro Kato

Hideharu Tanaka

Masaki Toyoshima

Hitoshi Iijima

Koji Ishijima

Tetsuhide Yokoyama

Hideaki Maeyama

Susumu Kawaguchi

Hideaki Nagata

Teruhiko Nishiki

Keisuke Shingu

Shuji Fujisaki

Kotaro Yoshida

Ken Asada

Tadahiro Yoshida

Koji Yamashita

Hiroyuki Morimoto

Naofumi Takenaka

Takashi Okazaki

Kazuyuki Tsukamoto

Tomokazu Matsui

Raito Kawamura

Takeshi Fushiki

Michio Fujiwara

Kei Sasaki

Kazuo Kashiwamura

Yoshihisa Kitora

Takeshi Izawa

Masao Tani

Shogo Moroe

Tetsuya Honda

Kiyoshi Taketoh

Atsuyoshi Fukaya

Atsuhiro Yabu

Masaaki Kamikawa

Takuho Hirahara

Naoto Uenakai

Soichi Shiraishi

A hermetic compressor includes a hermetic container having a bottom portion in which lubricating oil is stored and an electric motor including a stator and a rotator. The hermetic compressor further includes a drive shaft attached to the rotator and a compression mechanism for compressing refrigerant by using rotation of the drive shaft. The hermetic compressor also includes a rotary pressure increasing mechanism for increasing a pressure of refrigerant gas, the rotary pressure increasing mechanism being arranged on the rotator, and a cylindrical lateral wall for partitioning a space above the electric motor into an outer space and an inner space in a manner that the a cylindrical lateral wall surrounds the rotary pressure increasing mechanism. Finally, the hermetic compressor includes a discharge pipe for allowing the refrigerant to flow out from the inner space into an external circuit that is external to the hermetic container.

Hermetic compressor and vapor compression-type refrigeration cycle device including the hermetic compressor

An air-conditioning apparatus includes a controller which calculates a composition ratio of a refrigerant mixture using a high-pressure-side pressure of a refrigerant discharged from a compressor, a low-pressure-side pressure of a refrigerant to be sucked into the compressor, a high-pressure-side temperature of a refrigerant at an inlet side of a second expansion device in a high/low pressure bypass pipe, and a low-pressure-side temperature of a refrigerant at an outlet side of the second expansion device in the high/low pressure bypass pipe and which determines whether to open or close a bypass-channel opening/closing device.

Air-conditioning apparatus

A refrigerant compressor that enhances compressor efficiency by both reducing an amplitude of pressure pulsations and reducing pressure losses in a discharge muffler space into which is discharged a refrigerant compressed at a compression unit. A low-stage discharge muffler space is formed in the shape of a ring around a drive shaft. In the low-stage discharge muffler space, a discharge port rear guide is provided in the proximity of a discharge port through which is discharged the refrigerant compressed by a low-stage compression unit. The discharge port rear guide is provided at a flow path in one direction out of two flow paths from the discharge port to a communication port in different directions around the drive shaft, and prevents the refrigerant from flowing in that direction, thereby causing the refrigerant to circulate in a forward direction in the ring-shaped discharge muffler space.

Refrigerant compressor and heat pump apparatus

A refrigerant compressor includes: an electric motor including a stator and rotor inside a sealed vessel; a compressing mechanism driven by a crank shaft in the rotor; a lower portion oil pool storing in the sealed vessel lubricating oil that lubricates the compressing mechanism; an upper counterweight on an upper end of the rotor. Refrigerant gas compressed by the compressing mechanism is discharged inside the sealed vessel, passes through a gas channel formed on the electric motor, moves from a lower space to an upper space with respect to the electric motor, and is discharged outside the sealed vessel. An oil return flow channel is formed on the upper end of the rotor toward a lower end from a vicinity of a leading end portion of the upper counterweight in a direction of rotation, and oil expressed in a vicinity of the rotor is directed to the oil return flow channel.

Refrigerant compressor

A refrigeration cycle apparatus which is capable of performing matching of the volumetric flow rate without performing pre-expansion it obtained. A refrigeration circuit includes a compression unit including a main compressor and a second compressor, a gas cooler, an expansion mechanism, and an evaporator interconnected with pipes, and a sub-compression mechanism driven by power recovered by the expansion mechanism, a suction side of the sub-compression mechanism is connected to a compression process of the compression unit, a discharge side of the sub-compression mechanism is connected to an inlet side of the gas cooler, and flow rate of refrigerant flowing into the sub-compression mechanism is controlled.

Refrigeration cycle apparatus

A scroll fluid machine that suppresses fluctuations in a port aperture area during each revolution of an orbiting scroll. Suction ports for sucking in a working fluid are disposed on a second base plate to have openings in a vicinity of a winding start end portion of a second spiral tooth, and near an inward facing surface of the second spiral tooth at a position separated by an involute angle approximately 90&#xb0; from the winding start end portion of the second spiral tooth. Discharge ports for discharging the working fluid are disposed on a first base plate to have openings in a vicinity of a winding start end portion of a first spiral tooth, and near an inward facing surface of the first spiral tooth at a position separated by an involute angle approximately 90&#xb0; from the winding start end portion of the first spiral tooth.

Scroll fluid machine having multiple discharge ports

A scroll-type expansion machine includes an expansion mechanism including an orbiting scroll and a first fixed scroll for expanding a refrigerant and recovering a power, a sub-expansion mechanism including an orbiting scroll and a second fixed scroll for compressing the refrigerant by the power recovered by the expansion mechanism, and a seal ring disposed in at least one of an outer circumference portion of the sub-compression mechanism or an outer circumference portion of the expansion mechanism. An oil flow path is opened in an upper space of a hermetic vessel to make the upper space and a lower space at a compressed pressure of the sub-compression mechanism, and the lower space is provided with an oil pipe for communicating with the main compressor.

Scroll-type expansion machine

A refrigeration air conditioner includes a first equalizer pipe connecting a bottom portion of a first hermetic vessel, which contains a main compression mechanism and lubricating oil, to a bottom portion of a second hermetic vessel, which contains an expansion mechanism, a sub-compression mechanism, and lubricating oil. A second equalizer pipe connects a side of the second hermetic vessel at a position higher than a minimum oil level to a suction side of the main compression mechanism. The space within the second hermetic vessel is isolated from the expansion mechanism and the sub-compression mechanism, and the pressure within the second hermetic vessel is not dependent upon the pressure within the expansion mechanism and the pressure within the sub-compression mechanism.

Dual compressor air conditioning system with oil level regulation

A scroll compressor is provided which has favorable assembling property, does not require a thrust bearing, has a bearing structure for bearing a compression section at both sides thereof and has a simple structure of a scroll. The scroll compressor includes a compression section constituted of an orbiting scroll which is provided in a closed container, and in which volutes are substantially symmetrically formed on both surfaces of an orbiting base plate, and a main shaft is penetrated through and fixed to a center portion thereof, and a pair of fixed scrolls and that have the main shaft penetrated through and are placed on both the surfaces of the orbiting scroll, and have volutes which correspond to the respective volutes to respectively form compression chambers, and a motor which is provided in the closed container and drives the main shaft, a suction pipe which is provided in the closed container, and after a suction gas is introduced into the closed container and cools the motor, causes the gas to be sucked into the compression section, and a discharge pipe which is provided in the closed container and discharges the suction gas compressed by the compression section.

Scroll compressor

A scroll expander that is efficient in a wide range of operating conditions by suppressing leakage loss and decreasing in recovered power using a simple construction includes: an expansion mechanism, including an orbiting scroll and a first fixed scroll, recovers power by expanding a refrigerant; and an auxiliary compression mechanism, including an orbiting scroll and a second fixed scroll, compresses a refrigerant using power recovered by the expansion mechanism. A tip seal is mounted only on a spiral tooth of an orbiting scroll and a fixed scroll of one of the expansion mechanism or the auxiliary compression mechanism.

Refrigeration system including a scroll expander

A scroll compressor includes a compression section having an orbiting scroll with volutes that are substantially symmetrically formed on both surfaces of an orbiting base plate. A main shaft penetrates through and is fixed to a center portion of the base plate. A pair of fixed scrolls is placed on both surfaces of the orbiting scroll, and has volutes which correspond to the respective volutes of the orbiting scroll to form compression chambers. The main shaft has a notch part which is formed at a portion penetrating through the orbiting scroll and fixed scrolls. A slider is provided which has an eccentric hole including a flat slide surface corresponding to the notch part. The slider is fitted to the main shaft where the notch part is formed. The slider is made slidable in a direction orthogonal to a length direction of the main shaft by the flat slide surface.

Scroll compressor having a slider with a flat surface slidable and fitted in a notch part of a main shaft

A scroll compressor that has reduced leakage loss and high efficiency includes an orbiting scroll that has spiral teeth on two surfaces, and a fixed scrolls that face the surfaces of the orbiting scroll and that have spiral teeth that intermesh with the spiral of the orbiting scroll. Tip seals are mounted only to a spiral tooth of one of the fixed scrolls that intermeshes with a spiral tooth of the orbiting scroll and a spiral tooth of the orbiting scroll.

Scroll compressor with an orbiting scroll and two fixed scrolls and ring and tip seals

A scroll compressor is provided which has favorable assembling property, does not require a thrust bearing, has a bearing structure for bearing a compression section at both sides thereof and has a simple structure of a scroll. The scroll compressor includes a compression sectionconstituted of an orbiting scrollwhich is provided in a closed container, and in which volutes are substantially symmetrically formed on both surfaces of an orbiting base plateB, and a main shaftis penetrated through and fixed to a center portion thereof, and a pair of fixed scrollsandthat have the main shaft penetrated through and are placed on both the surfaces of the orbiting scroll, and have volutes which correspond to the respective volutes to respectively form compression chambers, and a motorwhich is provided in the closed container and drives the main shaft, a suction pipewhich is provided in the closed container, and after a suction gas is introduced into the closed container and cools the motor, causes the gas to be sucked into the compression section, and a discharge pipewhich is provided in the closed container and discharges the suction gas compressed by the compression section.

An accumulator is capable of preventing an excessive enlargement of the flow rate of a liquid refrigerant which is discharged from the accumulator, reducing the quantity of refrigerating machine oil which is accumulated in the accumulator, and maintaining a required quantity of refrigerating machine oil in a compressor. Liquid and a gas which circulate in a refrigerating and air-conditioning circuit are introduced into a first space by a suction pipe, and the gas refrigerant is discharged to a refrigerating and air-conditioning circuit through a gas passage pipe, a second space and a discharge pipe 5. A liquid-level maintaining mechanism prevents a rise in the height of the accumulated liquid introduced into the first space. When the height has been made to be not lower than a predetermined height, a gas communication mechanism moves liquid in the first space from the first space to the second space. A returning mechanism discharges refrigerating machine oil accumulated in the first space to the refrigerating and air-conditioning circuit.

Accumulator

In an accumulator constituting a refrigerating cycle apparatus, a high liquid-level auxiliary pipe (14a) and a low liquid-level auxiliary pipe (14b), which act as oil recovery pipes, and each of which is provided with a plurality of oil recovery holes (10a), are attached to a discharge pipe (12) in positions so as to be different vertically from each other, so that lubricating oil can be surely recovered through the oil recovery holes.

Accumlator

Growing community of inventors

Tokyo, Japan

Toshihide Koda