Rotary expansible chamber devices – Diverse rotary expansible chamber devices
Reexamination Certificate
2001-12-31
2003-10-28
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Diverse rotary expansible chamber devices
C418S005000, C418S055100, C418S266000, C418S152000, C418S013000, C417S201000
Reexamination Certificate
active
06638040
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dry vacuum pump, and more particularly, to a dry vacuum pump that combines both the advantage of high compression ratio of the scroll-type vacuum pump, and the advantage of high exhausting speed of the rotary-vane vacuum pump, with simple structure, lower production cost and higher working effectiveness and quality.
2. Description of the Prior Art
The conventional rotary-vane pump
10
, shown in
FIG. 2
, comprises a rotor
12
, a pair of rotary vanes
13
and a stator chamber
15
, wherein, a pair of vanes made of graphite are mounted on the rotor
12
through grooves thereon; in the interior of the stator chamber
15
a round-shaped rotating space
19
is formed and the rotor
12
is eccentrically positioned therein, with the rotor
12
and the pair of vanes
13
pressed by spring
18
coming into contact with the stator chamber wall
14
of the stator chamber
15
. An inlet
11
and an outlet
17
, both connecting the rotating space
19
, are mounted on the stator chamber
15
, with the opening and closing of the outlet
17
being controlled by an outlet valve
16
.
Please further refer to
FIG. 2
in accordance with FIG.
3
and FIG.
4
. The rotor
12
is directly driven by motor to circularly rotate within the rotating space
19
, during which the two vanes
13
begin to slide in the grooves of the rotor
12
, with the ends of both vanes keeping contact with the stator chamber wall
14
; since the two vanes are made of graphite, it is of no need to use vacuum pump oil to lubricate. Thus, by the movement of the rotor
12
and the vanes
13
, the goals of introducing air through the inlet
11
and discharging air through the outlet
17
are to be achieved.
The advantage of such rotary-vane vacuum pump is the excellent exhausting speed, yet it has poor range of vacuum compression ratio.
The conventional scroll-type vacuum pump
20
, shown in
FIG. 5
, comprises two scrolls
21
and
22
, wherein, one scroll is a fixed scroll
21
that is a counter-clockwise helicoid, and the other scroll is an orbiting scroll
22
that is a clockwise helicoid. These two scrolls define a space (the air-introducing space
42
, which is to be described later), and the orbiting scroll
22
, being mounted on the eccentric of the motor driving crank, is driven to revolve but not self-revolving due to the restriction of the anti-self-revolving mechanism; such revolving motion is to form an orbiting motion, by which the orbiting scroll
22
is to rotate clockwise, thus air in the air-introducing space is to be compressed, and then air compressed is to be discharged through the central outlet hole
23
.
The advantage of such scroll-type vacuum pump
20
is the high compression ratio, but since its motioning displacement is small, causing poor exhausting speed, it cannot be used for workload that requires higher exhausting speed, but only for lighter workload. The motor power can be expanded for such scroll-type vacuum pump
20
to increase the discharging (exhausting) speed, but the problem of overheating resulted therefrom shall acquire larger capacity of the cooling system.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a dry vacuum pump that combines the scroll-type vacuum pump and the rotary-vane vacuum pump, thus having the advantage of high compression ratio from the scroll-type vacuum pump, and the advantage of high exhausting speed from the rotary-vane vacuum pump, with simple structure, lower production cost and higher working effectiveness and quality.
The dry vacuum pump that achieves the aforementioned goals comprises a housing, with an inlet and an outlet; a rotary-vane vacuum pump, mounted inside the housing, including the rotor, a pair of rotary vanes and the stator chamber; a scroll-type vacuum pump, mounted inside the housing, including a fixed scroll and an orbiting scroll, and a motor-driven crank, used for driving the orbiting scroll of the scroll-type vacuum pump and the rotor of the rotary-vane vacuum pump. The rotary-vane vacuum pump is mounted on the side of the inlet, whereas the scroll-type vacuum pump is mounted on the side of the outlet, thus forming a conduit to connect both the rotary-vane vacuum pump and the scroll-type vacuum pump, for discharging and exhausting air, whereby air is introduced from the rotary-vane pump and discharged to the air-introducing space of the scroll-type vacuum pump, and then air is exhausted by the scroll-type vacuum pump.
The two vanes are mounted in the grooves of the rotor.
The vanes are made of graphite.
In the interior of the stator chamber a round-shaped rotating space is formed and the rotor is eccentrically positioned therein.
The rotor and the two vanes pressed by spring are to come into contact with the stator chamber wall of the stator chamber.
The inlet of the housing is connected to the rotating space of the stator chamber.
The outlet of the stator chamber is connected, via the channel of the housing, to the air-introducing space of the scroll-type vacuum pump, with the opening and closing of the outlet being controlled by an outlet valve.
The outlet of the housing is connected to the air-introducing space.
The rotary-vane vacuum pump and the scroll-type vacuum pump are adjacently mounted (e.g., by way of left-and-right juxtaposition) inside the housing; in addition, the housing is mounted with a right-end plate, and the ball-type anti-self-revolving mechanism is mounted between the right-end plate and the orbiting scroll of the scroll-type vacuum pump. Also a left-end plate is mounted in the housing located on the left side of the rotary-vane vacuum pump.
REFERENCES:
patent: 5947694 (1999-09-01), Hablanian
patent: 3637229 (1997-06-01), None
patent: 62-243982 (1987-10-01), None
patent: 04-109089 (1992-04-01), None
Cang Weng-Shih
Shieh Cheng Chou
Tang Jenn Chen
Wang Chih-Cheng
Bacon & Thomas PLLC
Denion Thomas
Industrial Technology Research Institute
Trieu Theresa
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