Mitsubishi Denki Kabushiki Kaisha

Yoshihide Ogawa

Kiyoharu Ikeda

Fumiaki Sano

Eiji Watanabe

Masayuki Kakuda

Toshiyuki Nakamura

Takeshi Fushiki

Shuji Motegi

Takashi Sebata

Teruhiko Nishiki

Shinji Nakashima

Hiroshi Ogawa

Shin Sekiya

Minoru Ishii

Masao Tani

Norihide Kobayashi

Susumu Kawaguchi

Yasuhiro Suzuki

Takashi Yamamoto

Munehisa Gunjima

Kazuyuki Akiyama

Wataru Izumisawa

On the assumption that pressure Pm (MPa) of a boss portion outside space determined by a restrictor and a flow regulating valve provided midway in an oil feed passageway is expressed by Pm &equals;Ps&plus;&agr;, and a differential pressure value at which a difference between high and low pressures becomes minimum in a running pressure range of a scroll compressor is represented by min(Pd&minus;Ps), the value a in the above expression is set to fall in a range expressed by 0<&agr;<min(Pd&minus;Ps). Here, Ps represents suction pressure (MPa) of the compressor, and Pd represents discharge pressure (MPa) of the compressor.

Scroll compressor

A compressor includes a compression mechanism part for compressing refrigerant sucked from an outside of the hermetic container and discharging compressed refrigerant to a discharge space, an electric motor part composed of a stator and a rotor, facing a first space which is at an opposite side of the discharge space with respect to the compression mechanism part in the hermetic container, for driving the compression mechanism part through a main shaft, a passage at an external circumferential side of the compression mechanism part, for connecting the discharge space with the first space, and a fan provided at an end of the rotor, facing the first space. The refrigerant discharged into the discharge space passes through the passage at the external circumferential side of the compression mechanism part to reach the first space, and passes the fan to be discharged to the outside of the hermetic container.

Compressor

A scroll compressor including a guide frame ( ) for fixing a fixed scroll member ( ) and a compliant frame ( ) for supporting an oscillating scroll member ( ) in the axial direction of the scroll compressor in the guide frame ( ), wherein the guide frame ( ) has a plurality of cylindrical surfaces ( ), and the compliant frame ( ) has a plurality of cylindrical surfaces ( ) which engage with the cylindrical surfaces ( ), and wherein in order to facilitate assembling of the guide frame ( ) and the compliant frame ( ), the first cylindrical surfaces ( ) are first engaged with each other when the compliant frame ( ) is inserted into the guide frame ( ), that is, the cylindrical surfaces are engaged in the order of increase in diameter.

Scroll compressor including guide frame and compliant frame

A structure is provided that prevents excessive force from acting on a fastening portion where a guide frame is fastened to a sealed container. A fastening position of the guide frame and sealed structure is set within a range bounded by an upper meshing circumferential inner surface of the guide frame together with an upper meshing circumferential outer surface of a compliant frame and a lower meshing circumferential inner surface of the guide frame together with a lower meshing circumferential outer surface of the compliant frame.

According to a scroll compressor of the present invention, at least one of a diameter space between an upper fitting surface of the guide frame and an upper fitting surface of the compliant frame at an upper fitting part where the upper fitting surface of the guide frame contacts with the upper fitting surface of the compliant frame, and a diameter space between a lower fitting surface of the guide frame and a lower fitting surface of the compliant frame at a lower fitting part where the lower fitting surface of the guide frame contacts with the lower fitting surface of the compliant frame is set to be equal to or shorter than a diameter space between the rotor and the stator.

Scroll compressor having a compliant frame and a guide frame for the orbiting scroll

A rotary compressor having a piston provided integrally with a blade is contained in a hermetic vessel which is operated at a suction pressure of the rotary compressor and not to discharge pressure. The rotary compressor includes a compression mechanism portion having a cylinder which includes a suction port formed in a cylinder chamber, a piston which eccentrically revolves in the cylinder, a blade which is integrally formed with the piston and partitions the cylinder chamber into a high pressure chamber and a low pressure chamber, and a driving shaft for revolving the piston. The rotary compressor also includes an electric motor portion for rotating the driving shaft, a hermetic vessel which houses the compression mechanism portion and the electric motor portion and is in communication with the suction port thereby to maintain an interior of the hermetic vessel at a suction pressure atmosphere, and a discharge port formed in the cylinder chamber and in direct communication with an exterior of the hermetic vessel, whereby starting is smoothly performed, a motor having a large starting torque is not required, components such check valves can be avoided, and lubricating oils with stable viscosity can be used such that the compressor operates with environmentally-friendly refrigerants.

Rotary compressor, refrigerating cycle using the compressor, and refrigerator using the compressor

A scroll compressor comprising a fixed scroll, a rotating scroll, a compliant frame for supporting the rotating scroll in an axial direction and a main shaft for driving the rotating scroll in directions of radiuses of the rotating scroll, and a guide frame fixed to a hermetically sealed vessel for supporting the compliant frame in the directions of its radiuses, wherein the rotating scroll is slidable in the axial direction by sliding of the compliant frame on the guide frame; a space is formed between the compliant frame and the guide frame; and a pressure in the space is made to be a pressure higher than a suction pressure and the same as a discharge pressure or less, whereby relief of the rotating scroll is avoidable to quickly and constantly realize a state of normal operation.

The invention concerns a scroll compressor which is low in noise caused by water hammering of a refrigerant gas just after a discharge valve is closed. The scroll compressor includes a discharge member (45) having a discharge port (8) opposed to a discharge port (5) of a fixed scroll (2) and a discharge valve (9) opposed to the discharge port (8) of the discharge member (45) and opened/closed depending on a difference between flow passage pressure of a refrigerant gas and pressure in a high pressure space (27) in a sealed vessel (1). At least either of the fixed scroll (2) and the discharge member (45) is formed with a muffler chamber communicated with the discharge port (5, 8) and having a diameter larger than a diameter of the discharge port (5) of the fixed scroll (2) for suppressing occurrence of an impulse wave caused by water hammering when the discharge valve (9) is closed. Noise caused by a pressure ripple of the discharge port lessens, quieting the operation of the scroll compressor.

Scroll compressor having a discharge muffler chamber

The invention concerns a scroll compressor which is low in noise caused by water hammering of a refrigerant gas just after a discharge valve is closed. The scroll compressor includes a discharge member (45) having a discharge port (8) opposed to a discharge port (5) of a fixed scroll (2) and a discharge valve (9) opposed to the discharge port (8) of the discharge member (45) and opened/closed depending on a difference between flow passage pressure of a refrigerant gas and pressure in a high pressure space (27) in a sealed vessel (1). At least either of the fixed scroll (2) and the discharge member (45) is formed with a counterboring part which communicates with an intermediate pessure chamber after the and intermediate pressure chambers have begun to communicate via separation of the spiral teeth.

Scroll compressor having a counterboring part communicating with an

The invention concerns a high-reliability scroll compressor with little moment for making a fixed scroll unstable. A scroll compressor comprising in a sealed vessel a fixed scroll, an orbiting scroll being combined with the fixed scroll for forming a compression space, and executing orbiting motion with respect to the fixed scroll, a frame for axially supporting the orbiting scroll and radially supporting a drive shaft, and a seal member being disposed in an axial gap between a high and low pressure separator stuck to the frame by any method and the fixed scroll, wherein a base plate outer peripheral surface of the fixed scroll is radially supported by a stationary member coaxial with the base plate outer peripheral surface, and wherein with the stationary member as a guide, the fixed scroll can make axial movement within a range in which it interferes with the orbiting scroll downward in the axial direction and with the high and low pressure separator upward in the axial direction.

Scroll compressor with axial biasing

The invention concerns a scroll compressor which is low in noise caused by water hammering of a refrigerant gas just after a discharge valve is closed. The scroll compressor includes a discharge member (45) having a discharge port (8) opposed to a discharge port (5) of a fixed scroll (2) and a discharge valve (9) opposed to the discharge port (8) of the discharge member (45) and opened/closed depending on a difference between flow passage pressure of a refrigerant gas and pressure in a high pressure space (27) in a sealed vessel (1). At least either of the fixed scroll (2) and the discharge member (45) is formed with a counterboring part which communicates with an intermediate pressure chamber after the high and intermediate pressure chambers have begun to communicate via separation of the spiral teeth.

The invention concerns a high-reliability scroll compressor with little moment for making a fixed scroll unstable. A scroll compressor comprising in a sealed vessel a fixed scroll, an orbiting scroll being combined with the fixed scroll for forming a compression space, and executing orbiting motion with respect to the fixed scroll, a frame for axially supporting the orbiting scroll and radially supporting a drive shaft, and a seal member being disposed in an axial gap between a high and low pressure separator stuck to the frame by any method and the fixed scroll. A base plate outer peripheral surface of the fixed scroll is radially supported by a stationary member coaxial with the base plate outer peripheral surface, and with the stationary member as a guide. The fixed scroll can make axial movement within a range in which it interferes with the orbiting scroll downward in the axial direction and with the high and low pressure separator upward in the axial direction.

Scroll compression having a discharge muffler chamber

A scroll compressor comprising a rotation constraining device for restricting the rotation of the orbital scroll toward the principal axis rotational direction and for extending the constraining range of the orbital scroll toward the principal axis reverse rotational direction, and a compression chamber torque forming device for causing a pressure in a first compression chamber to be larger than that in a second compression chamber when the pressure in the compression chambers rises up abnormally high. The first compression chamber is formed between the wrap member inside surface of the fixed scroll and the wrap member outside surface of the orbital scroll and the second compression chamber is formed between the wrap member outside surface of the fixed scroll and the wrap member inside surface of the orbital scroll.

Growing community of inventors

Tokyo, Japan

Yoshihide Ogawa