Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2000-01-21
2001-07-24
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055100, C418S055200, C418S055400, C418S183000
Reexamination Certificate
active
06264444
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll-type compressor in which a stationary scroll having a stationary scroll base plate and a stationary spiral wall formed on the stationary scroll base plate is opposed to a movable scroll having a movable scroll base plate and a movable spiral wall formed on the movable scroll base plate, so that closed spaces, the volumes of which are reduced upon the orbital rotation of the movable scroll, are formed between the stationary spiral wall and the movable spiral wall of the movable scroll which orbitally rotates but does not rotate about its own axis, and the movable scroll is rotated by transmitting the rotational force of a rotatable shaft to the orbital rotating mechanism for rotating the movable scroll.
2. Description of the Related Art
The closed spaces become narrower toward the inner ends of the spiral walls of the stationary scroll and the movable scroll upon the rotation of the movable scroll. In the scroll-type compressors disclosed in Japanese Unexamined Patent Publications (Kokai) No. 56-165787, No. 56-165788, No. 61-98987 and No. 3-92502, a gas compressed between the movable scroll and the stationary scroll is discharged to the back surface side of the stationary scroll through a port that extends through the stationary scroll base plate.
As a means to construct the scroll-type compressor in a compact size, means have been proposed according to which the stationary scroll is formed as a part of the housing of the compressor, as disclosed in, for example, Japanese Unexamined Patent Publication (Kokai) No. 56-165787. However, it is difficult to construct the scroll-type compressor in a more compact size.
SUMMARY OF THE INVENTION
The object of the present invention is to construct a scroll-type compressor in a more compact size.
A scroll-type compressor, according to the present invention, comprises a rotatable shaft having an axis, a stationary scroll having a stationary scroll base plate and a stationary spiral wall formed on the stationary scroll base plate, and a movable scroll having a movable scroll base plate and a movable spiral wall formed on the movable scroll base plate, the movable scroll being opposed to the stationary scroll such that closed spaces are defined between the stationary spiral wall and the movable spiral wall, the movable scroll having an axis which does not coincide with the axis of the rotatable shaft. Also, there are provided an orbital rotating mechanism for revolving the movable scroll around the axis of the rotatable shaft, and a rotation preventing mechanism for preventing the rotation of the movable scroll around the axis of the movable scroll. The closed spaces have volumes which are reduced while the movable scroll is rotated around the axis of the rotatable shaft and is prevented from being rotated about the axis of the movable scroll. The compressor is characterized by that the orbital rotating mechanism and the rotatable shaft are arranged on the side of the movable spiral wall with respect to the movable scroll base plate.
According to the constitution of the present invention, which is different from the conventional constitution in which the an orbital rotating mechanism and a rotatable shaft are arranged on the back surface side of the movable scroll base plate, it is allowed to shorten the size of the scroll-type compressor in the axial direction of the rotatable shaft.
Preferably, the movable scroll is disposed between the stationary scroll and the front housing. The front housing forms a portion of the housing for holding the movable scroll that rotates.
Preferably, a discharge chamber is provided on the back surface side of the movable scroll base plate, and a compressed gas is discharged into the discharge chamber from the final closed space so that the pressure in the discharge chamber acts upon the back surface of the movable scroll base plate.
The discharge chamber is a discharge pressure region, and the pressure in the discharge pressure region acts as a back pressure on the movable scroll base plate.
Preferably, the discharge chamber is formed in the front housing. The interior of the front housing is best suited as a place for forming the blow-out chamber.
Preferably, the discharge chamber is surrounded by a sealing device interposed between the front housing and the movable scroll base plate.
The sealing device prevents leakage of the compressed gas from the discharge chamber through a gap between the front housing and the movable scroll base plate.
Preferably, a discharge port is formed through the movable scroll base plate to discharge a fluid from the final closed space into the discharge chamber, and a discharge valve is mounted on the back surface of the movable scroll base plate so as to open and close the discharge port.
The compressed gas in the final closed space is discharged into the discharge chamber by pushing the discharge valve that turns integrally with the movable scroll that rotates.
Preferably, a pressure-receiving plate is interposed between the front housing and the movable scroll base plate.
When the front housing and the movable scroll are made of, for example, a material containing aluminum to decrease the weight, there takes place a sliding contact between the same materials, which is not desirable. The pressure-receiving plate that comes into sliding contact with the movable scroll is made of, for example, an iron material to avoid a sliding contact between the same materials.
Preferably, the sealing device comprises a first seal ring interposed between the front housing and the pressure-receiving plate, and a second seal ring interposed between the movable scroll base plate and the pressure-receiving plate.
The first and second seal rings prevent the leakage of the compressed gas from the discharge chamber through a gap between the front housing and the movable scroll base plate.
Preferably, the stationary scroll is disposed between the movable scroll and a rear housing. The rear housing forms a part of the housing for holding the movable scroll that revolves.
Preferably, the rear housing supports one end of the rotatable shaft via a radial bearing. The constitution for supporting the rotatable shaft by the rear housing is simple. The other end of the rotatable shaft is supported by a motor housing attached to the rear housing.
Preferably, the orbital rotating mechanism includes an eccentric shaft that rotates integrally with the rotatable shaft and a bearing means interposed between the movable scroll and the eccentric shaft, the bearing means being held in a boss portion that protrudes from the movable scroll base plate toward the movable spiral wall.
Preferably, the stationary scroll base plate surrounds the cylinder.
Preferably, the rotation preventing mechanism is disposed between the movable scroll base plate and the front housing to prevent the rotation of the movable scroll that rotates.
Preferably, the rotation preventing mechanism includes pins of a cylindrical shape mounted on either the front housing or the movable scroll base plate, and holes of a circular shape formed in the other one of either the front housing or the movable scroll base plate, the pins being inserted in the holes in a manner that the outer peripheral surfaces thereof contact the inner peripheral surfaces of the holes.
A gap between the front housing and the movable scroll base plate is best suited for arranging the rotation preventing mechanism.
REFERENCES:
patent: 4795323 (1989-01-01), Lessie
patent: 4810176 (1989-03-01), Seufuji et al.
patent: 5366359 (1994-11-01), Bookbinder et al.
patent: 5681155 (1997-10-01), Hisanaga et al.
patent: 5795141 (1998-08-01), Oke et al.
patent: 55-051982 (1980-04-01), None
patent: 56-165787 (1981-12-01), None
patent: 57-105582 (1982-07-01), None
patent: 61-98987 (1986-05-01), None
patent: 62-003101 (1987-01-01), None
patent: 3-070888 (1991-03-01), None
Fujii Toshiro
Murakami Kazuo
Nakane Yoshiyuki
Yokomachi Naoya
Denion Thomas
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Trieu Theresa
Woodcock Washburn Kurtz Mackiewicz & Norris LLP
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