Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Reexamination Certificate
1999-12-27
2001-03-20
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
C418S006000
Reexamination Certificate
active
06203301
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a fluid pump which is used in various industrial fields.
BACKGROUND ART
Referring to
FIG. 10
, there are shown cross-sectional views illustrating operations of an oscillating type rotorsco pump of the related art.
As shown, a rotorsco pump includes a camshaft
64
which is eccentrically connected to a rotating shaft
63
of a motor to be eccentrically rotated by rotation of the motor, a rotor
61
which is eccentrically rotated while sliding on an inner wall of an outer casing
62
by rotation of the camshaft
64
, and an oscillating shaft
60
which is positioned on a line bisecting the rotor
61
and serves as a centering shaft of the rotor
61
.
In operations of the rotorsco pump of the related art, constructed as mentioned above, if the camshaft
64
is eccentrically rotated by the rotation of the motor, the rotor
61
is also eccentrically rotated to compress and discharge fluid. At this time, while an angle formed by the oscillating shaft
60
for one revolution of the rotor
61
is changed from 0 to &agr; or &bgr;, torque is produced at a contact point between the oscillating shaft
60
and the rotor
61
. By this, it is difficult to control eccentricity of the rotor
61
, and as abrasion of the camshaft
64
and a bearing progresses, friction between the rotor
61
and the inner wall of the outer casing
62
is augmented.
As another fluid pump, a scroll compressor of which the driving type is modified not to rotational reciprocating movement, but to pivoting movement, is disclosed in the art. However, the scroll compressor suffers from defects in that workability is deteriorated because of a complicated scroll curve and a larger fluid capacity cannot be achieved due to a limitation in machining the scroll curve to a sufficient depth. Further, when abrasion of a crankshaft and a bearing is generated, abrasion and fracture are caused between scrolls. Accordingly, because maintenance must be thoroughly carried out, a great deal of effort and time is needed.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and a primary object of the present invention is to provide an air-cooled fluid pump which reduces friction and noise generated between a rotor and a fixed casing and eliminates the necessity of using lubricant, by decreasing relative velocity of the rotor with respect to the fixed casing.
Another object of the present invention is to provide a fluid pump which accomplishes high efficiency by securing a larger fluid accommodating space.
In order to achieve the above object, according to the present invention, there is provided a fluid pump comprising: a camshaft eccentrically connected to a rotating shaft of a motor to be eccentrically rotated by rotation of the motor; a rotor coupled to three crankshafts to revolve along a predetermined orbit by eccentric rotation of the camshaft, the rotor having a concave groove which is formed in a radial direction; an outer casing cooperating with the rotor to define a first fluid chamber between an outer wall of the rotor and the outer casing, the outer casing having a pair of fluid passages which are defined at both sides of a guide bank to allow fluid to be sucked and discharged therethrough, respectively; a side cover coupled to the outer casing to define a body of the fluid pump; an inner casing integrally formed with the side cover, the inner casing cooperating with the rotor to define a second fluid chamber between an inner wall of the rotor and the inner casing; the three crankshafts disposed in the outer casing and coupled to the rotor inside of the inner wall of the rotor for controlling eccentricity of the rotor; and the guide bank integrally formed with the outer casing, the guide bank functioning to separate a fluid suction side and a fluid discharge side from each other.
While the guide bank has a configuration of a round-head rivet, it can be replaced with another guide bank which has a T or I-shaped configuration.
The guide bank is positioned in the concave groove which is formed in the rotor.
The inner casing is formed in a radial direction with a concave surface which corresponds to a configuration of a free end of the guide bank.
The guide bank functions to guide fluid such that the fluid can be sucked and discharged into and from the first and second fluid chambers defined between the rotor and the casings.
According to another aspect of the present invention, there is provided a fluid pump comprising: a camshaft eccentrically connected to a rotating shaft of a motor to be eccentrically rotated by rotation of the motor; a rotor coupled to three crankshafts to revolve along a predetermined orbit by eccentric rotation of the camshaft, the rotor having a concave surface which is formed in a radial direction; an outer casing cooperating with the rotor to define a fluid chamber between an outer wall of the rotor and the outer casing, the outer casing having a pair of fluid passages which are defined at both sides of a guide bank to allow fluid to be sucked and discharged therethrough, respectively; a side cover coupled to the outer casing to define a body of the fluid pump; the three crankshafts disposed in the outer casing and locked to the rotor inside of the inner wall of the rotor for controlling eccentricity of the rotor; and the guide bank integrally formed with the outer casing, the guide bank functioning to separate a fluid suction side and a fluid discharge side from each other.
The guide bank functions to guide fluid such that the fluid between the rotor and the outer casing can be sucked and discharged.
The guide bank is positioned in the concave surface which is formed in the rotor.
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Bacon & Thomas PLLC
Denion Thomas
Trieu Theresa
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