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Rotary compressorRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Expansible Chamber PumpRotary compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070122297, Rotary compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a rotary compressor including, in a sealed vessel, a electromotive element, a rotary compression element driven by a rotary shaft of this electromotive element and a cantilever bearing which rotatably supports the rotary shaft of this rotary compression element. [0002] Heretofore, a rotary compressor such as a multistage compression type rotary compressor including first and second rotary compression elements includes, in a sealed vessel, a electromotive element and the first and second rotary compression elements driven by a rotary shaft of this electromotive element. [0003] An electromotive element is constituted of an annular stator fixed along an inner peripheral surface which defines an upper space of the sealed vessel by welding; and a rotor inserted in the element so that a slight interval is disposed between the rotor and an inner periphery of this stator. This rotor is fixed to the rotary shaft passed through the center of the element in a vertical direction. [0004] Moreover, the first and second rotary compression elements include an intermediate partition plate; upper and lower cylinders disposed on and under this intermediate partition plate; rollers which are fitted into eccentric portions disposed on the rotary shaft with a phase difference of 180 degrees to eccentrically rotate in these cylinders; vanes which abut on the rollers to define the insides of the cylinders into low pressure chamber sides and high pressure chamber sides, respectively; an upper support member and a lower support member which block an upper opening surface of the upper cylinder and a lower opening surface of the lower cylinder and which have bearings of the rotary shaft, respectively; and upper and lower discharge muffling chambers, respectively. Each discharge muffling chamber is connected to the high pressure chamber side in each cylinder by a discharge port. In each discharge muffling chamber, a discharge valve is disposed which openably blocks the discharge port (see, e.g., Japanese Patent Application Laid-Open No. 2004-19599). [0005] In the rotor of the conventional rotary compressor, a rotation angular speed inversely proportional to a rotation inertia moment is generated in proportion to a difference between a compression torque and a torque of a motor, and a fluctuation (reaction of the rotation angular speed) of the rotation angular speed, which is inversely proportional to the rotation inertia moment, is a cause for a rotary vibration of the rotary compressor. The rotation angular speed of the rotor is an integral of the rotation angular speed inversely proportional to the rotation inertia moment with respect to a time. After one rotation, the rotation angular speed returns to an original rotation angular speed. Therefore, the smaller the number of the rotations of the compressor is, the longer a time required for one rotation becomes. Moreover, a fluctuation width of the rotation angular speed during one rotation increases. Therefore, there is a problem that the vibration of the compressor increases. [0006] Furthermore, when there is a large fluctuation width of the rotation angular speed during one rotation, a ratio increases at which the compressor is operated in a rotation angular speed range having a small efficiency, and an efficiency of the motor decreases. Therefore, the smaller the number of the rotations of the motor is, the more the efficiency of the compressor decreases. When the compressor or the motor is miniaturized, the rotation inertia moment decreases, and the increase of the compressor vibration and the decrease of the efficiency easily appear. SUMMARY OF THE INVENTION [0007] A rotary compressor of a first invention has, in a sealed vessel, a electromotive element, a compression mechanism driven by this electromotive element and a cantilever bearing which rotatably supports a rotary shaft of the electromotive element, and the rotary compressor has, on the bottom of a rotor (on a compression mechanism side), a mass article which extends to a lower part of a stator and which obtains a rotation inertia moment. [0008] Moreover, a rotary compressor of a second invention has, in a sealed vessel, a electromotive element, a compression mechanism driven by this electromotive element and a cantilever bearing which rotatably supports a rotary shaft of the electromotive element, and the rotary compressor has, on the top of a rotor (on a side opposite to the compression mechanism), a mass article which extends to a lower part of a stator and which obtains a rotation inertia moment. [0009] Furthermore, in a rotary compressor of a third invention, the above inventions are characterized in that the mass article disposed on the rotor is formed into a shape having an outer diameter which is equal to or smaller than an outer diameter of the rotor until a necessary insulation distance is reached from a stator coil, and after the insulation distance, the outer diameter of the shape is enlarged toward an inner wall of the sealed vessel into such as size as to cover the stator coil. [0010] In addition, in a rotary compressor of a fourth invention, the above inventions are characterized in that a discharge port to discharge a compressed gas from the rotary compression element into the sealed vessel is disposed in a position corresponding to 1/2 or less of the maximum outer diameter of the mass article disposed on the rotor. [0011] According to the first or second invention, the rotary compressor comprises, in the sealed vessel, the electromotive element, the rotary compression element driven by this electromotive element and the cantilever bearing which rotatably supports the rotary shaft of the electromotive element. The mass article capable of obtaining the rotation inertia moment is attached to one of an upper end face of the rotor (on the side opposite to the compression mechanism) and a lower end face of the rotor (on the compression mechanism side). In consequence, it is possible to provide the compressor having a high efficiency in which a vibration increase of the compressor is suppressed even during an operation having the small number of rotations of the compressor. Furthermore, the mass article to be attached extends toward the stator. Therefore, when a dimension of the mass article in a width direction is enlarged, a dimension of the article in a thickness direction can be decreased, and the whole compressor can be miniaturized in a height direction. [0012] Moreover, in addition to the above inventions, according to the third invention, the mass article disposed on the rotor is formed into the shape having the outer diameter which is equal to or smaller than the outer diameter of the rotor until the necessary insulation distance from the stator coil is reached. After the insulation distance, the outer diameter of the shape is enlarged toward the inner wall of the sealed vessel into such a size as to cover the stator coil. In consequence, a necessary rotation inertia moment can be obtained. [0013] Furthermore, in addition to the above inventions, according to the fourth invention, the discharge port to discharge the compressed gas from the rotary compression element into the sealed vessel is disposed in the position corresponding to 1/2 or less of the maximum outer diameter of the mass article disposed on the rotor. In consequence, an oil in the discharged gas is separated by the mass article, and an amount of the oil to be discharged from the compressor can be decreased. BRIEF DESCRIPTION OF THE DRAWINGS [0014] FIG. 1 is a vertically sectional view of a rotary compressor in Embodiment 1 of the present invention (an example in which a rotation inertia article is attached to a compression mechanism side); [0015] FIG. 2 is a vertically sectional view of the rotary compressor in Embodiment 1 of the present invention (an example in which a rotation inertia article is attached to a side opposite to a compression mechanism); [0016] FIG. 3 is a vertically sectional view of a rotary compressor in Embodiment 2 of the present invention; and [0017] FIG. 4 is an enlarged view showing positions of the rotation inertia article and a discharge port in Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0018] The present invention is characterized in that a rotary compressor having a high efficiency in which a vibration increase of the compressor is suppressed even in a region having the small number of rotations is realized by attaching a rotation inertia article to a rotor. It is also possible to cope with a vibration increase and an efficiency decrease due to miniaturization of the compressor. A mass article disposed on the rotor is formed into a shape having an outer diameter which is equal to or smaller than an outer diameter of the rotor until a necessary insulation distance is reached from a stator coil, and after the insulation distance, the outer diameter of the shape is enlarged toward an inner wall of a sealed vessel into such a size as to cover the stator coil. In consequence, a necessary rotation inertia moment is obtained. Moreover, a discharge port to discharge a compressed gas from a rotary compression element into a sealed vessel is disposed in a position corresponding to 1/2 or less of the maximum outer diameter of the mass article disposed on the rotor. In consequence, an oil contained in the discharged gas is separated by the mass article, and an amount of the oil to be discharged from the compressor is decreased. Embodiment 1 [0019] Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a vertically sectional view of a high inner pressure type rotary compressor 10 as an embodiment of a rotary compressor of the present invention. The rotary compressor includes first and second rotary compression elements 32, 34, and a mass article, that is, a rotation inertia article 82 attached to a rotor 24 with a rivet 73 on a compression mechanism side. FIG. 2 shows a vertically sectional view of the rotary compressor 10 in a second invention. 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