Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-10-15
2001-02-20
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S101000, C417S371000
Reexamination Certificate
active
06190145
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll fluid machine of which the scroll machine proper is forced cooled by letting cooling gas taken in by a cooling fan flow in one direction.
2. Description of the Related Art
A variety of scroll machines which are forced cooled by cooling fan are known. The published Unexamined Japanese Patent Application No. Hei 10-26090 is one of them.
According to the disclosure, a scroll body composed of a stationary scroll and a revolving scroll is coupled to an end of the rotation shaft of an electric motor, a cooling fan is coupled to the other end of the rotation shaft, a guide ring surrounds the outer circumferential surface of the motor with some gap between them to form a passage, and a cooling gas taken in by the fan passes through the passage and cools forcibly the revolving scroll and its bearing.
By the prior art described above, there is a problem that the cooling is insufficient because, although the back side of the revolving scroll and its bearing is forced cooled, the back side of the stationary scroll is not forced cooled.
Further, there is also a problem that the cooling gas which has cooled the back side of said revolving scroll and its bearing flows out through an exhaust opening in the direction perpendicular to that of inflow and induces high flow loss of the cooling gas.
SUMMARY OF THE INVENTION
The object of the present invention is, in view of the fact as mentioned above, to offer a scroll fluid machine of which the cooling of the scroll body is performed sufficiently and efficiently.
The present invention cited in claim
1
is characterized in that, in a scroll fluid machine in which the scroll machine proper is driven by a rotation shaft of an electric motor and forced cooled by a cooling gas taken in by a cooling fan, which cooling gas flows in one direction,
a tubular jacket is provided to surround at least a part of the outer circumferential surface of the electric motor keeping some distance from the outer circumferential surface to form an annular passage for cooling gas taken in by a cooling fan, which cooling gas flows into the annular passage from an annular aperture formed between the outer circumferential surface and an end of said tubular jacket;
a passage connecting to the annular passage is formed to guide and send out the cooling gas to a side of the scroll machine proper in a direction crossing the longitudinal direction of the rotation shaft; and
the cooling gas flows from one lateral side to the other lateral of the scroll machine proper to forcibly cool the back side of the scroll disk.
The scroll fluid machine of the present invention is applicable not only for compression of fluid but as vacuum pump. The electric motor may be an inner rotor type or outer rotor type as far as the driving force of said motor is taken out through a rotation shaft which can be connected to drive the scroll machine proper.
Further, the scroll machine proper may be one which is composed of a stationary scroll and a revolving scroll, such as, for example, a single lap scroll type or a double laps scroll type, or a combination of a driving scroll and a follower scroll.
The taken-in cooling gas is introduced to the scroll machine proper in a direction crossing the longitudinal direction of the rotation shaft and flows on the back side surface of the scroll disk, that is the back side surface of the compression chamber of scroll, in one direction from one side to the other side of the scroll disk cooling forcibly the scroll disk, and so sufficient cooling is performed efficiently.
It is also an effective means of the present invention to compose so as to cool the back side of the disk of one scroll and at the same time cool the backside of the disk of the other scroll which is disposed opposing the former scroll to form a compression chamber by letting a cooling gas flow in one direction from one lateral side to the other lateral side of the scrolls.
By means of this construction, as the taken-in cooling gas is introduced to the scroll machine proper in a direction crossing the longitudinal direction of the rotation shaft and the back side of the disk of one scroll and at the same time the back side of the disk of the other scroll which is disposed opposing the former scroll to form a compression chamber are cooled by letting the cooling gas flow in one direction from one lateral side to the other lateral side of the scrolls, sufficient and efficient cooling is performed.
Further, as the back side of both disks which form a compression chamber are cooled, even the cooling gas after cooling the motor when passing the annular cooling passage formed between the outer circumferential surface of the motor and an tubular jacket can cool the scroll machine proper effectively.
It is also an effective means of the present invention to compose so that both scrolls have a number of cooling fins on their back surfaces and a connecting device is provided behind one of the scrolls toward the motor side to connect the scroll to the rotation shaft of the motor. By means of this construction, the cooling fins can be provided on the back surface of the scroll disk between the disk and the connecting device, because the rotation shaft of the motor is not directly connected to the scroll but connected through the connecting device, which eliminates the necessity of providing a boss for the connection and makes it possible to secure the space for providing cooling fins in the central portion of the disk of the scroll, and so the center portion of the scroll where heat generation is high is cooled effectively.
It is also an effective means of the present invention to compose so that one end of the rotation shaft of the motor is connected to the scroll machine proper and the other end is provided with a cooling fan in the space formed by upper and lower covers which also form a passage for guiding the cooling gas, and the fan rotates with rotation of the motor to forcibly cool the scroll machine proper; or to compose so that a fan is placed at the lateral side opposite to the lateral side of the scroll machine proper where the cooling gas is introduced in the back side of the scroll disk.
It is also an effective means of the present invention to compose so that the tubular jacket is shaped like a bell mouth at the inlet and corners of the passage to guide the cooling gas to the scroll machine proper are rounded to reduce the flow loss of the cooling gas to attain efficient cooling.
It is also an effective means of the present invention to compose so that the flow diverting means is provided at the outlet of the guide passage to divert the flow to the back side of s scroll disk and to that of the other scroll disk.
By the flow diverting means the cooling gas is distributed properly to the back side of a scroll disk and to that of the other scroll disk, effecting balanced and efficient cooling.
REFERENCES:
patent: 3134369 (1964-05-01), Schlor
patent: 5417554 (1995-05-01), Kietzmann et al.
patent: 5551846 (1996-09-01), Taylor et al.
patent: 360048 (1990-03-01), None
patent: 58-146894 (1983-10-01), None
patent: 3-145588 (1991-06-01), None
patent: 3-130588 (1991-06-01), None
patent: 5-071472 (1993-03-01), None
patent: 6-129383 (1994-05-01), None
patent: 7-29269 (1995-07-01), None
patent: 10-26090 (1998-01-01), None
patent: 63-100294 (1998-05-01), None
Fujioka Tamotsu
Satoh Tohru
Anest Iwata Corporation
Denion Thomas
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Trieu Theresa
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