Pumps – Diverse pumps
Reexamination Certificate
2001-08-09
2003-11-04
Walberg, Teresa (Department: 3742)
Pumps
Diverse pumps
Reexamination Certificate
active
06641370
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vacuum pump apparatus having an improved sealing structure, and in particular to an improved vacuum pump apparatus which is capable of implementing a simple structure without a formation of an O-ring groove for engaging an O-ring therein, a lower fabrication cost, and a stable sealing function and decreasing a maintenance cost.
2. Description of the Background Art
As shown in
FIG. 5
, a conventional vacuum pump apparatus includes cylinders
104
and
105
for sucking a gas from a vacuum apparatus connected with a pump suction port
102
based on the rotation of rotors
100
and
101
, compressing the sucked gas and discharging the gas through a discharging port
103
. In the conventional vacuum pump apparatus, the cylinders
104
and
105
, a front cover member
106
, and a pump cover
107
are assembled.
In addition, an oil pump
111
is installed for implementing a control operation of a reverse flow prevention valve
108
and a lubricating, sealing and cooling operation of each component of the pump apparatus
110
. The oil from the oil pump
111
is supplied to each portion of the apparatus including the cylinders
104
and
105
through oil flow paths
112
,
113
,
114
,
115
and
116
.
Since the interior of the pump apparatus
110
, namely, the cylinders
104
and
105
has a high temperature, an O-ring groove is formed in assembled boundary surfaces
117
,
118
and
119
of the member
104
,
105
,
106
and
107
, respectively, for sealing the same, and an O-ring
120
is engaged to each O-ring groove so that a gas(air) is not flown from the outside of the pump apparatus
110
.
However, in the conventional sealing structure, since the O-ring grooves are formed in the assembled boundary surfaces
117
,
118
and
119
of the members
104
,
105
,
106
and
107
, a fabrication cost is increased. Since the O-ring
120
is directly contacted with an oil and gas, as the time is passed, the O-ring
120
is corroded for thereby decreasing a sealing performance of the O-ring
120
. In addition, since the O-ring
120
is frequently changed, the pump apparatus
110
is frequently disassembled for thereby increasing a maintenance cost.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a vacuum pump apparatus which is capable of implementing a simple structure without a formation of an O-ring groove for engaging an O-ring therein, a lower fabrication cost and a stable sealing function and decreasing a maintenance cost.
To achieve the above object, there is provided a vacuum pump apparatus in which a circular oil seal space is formed in assembling boundary surfaces of a cylinder, an oil pump housing and an oil pump cover which are sequentially assembled, wherein said oil seal space is communicated with an oil flow path through which an oil is supplied from the oil pump to each operating portion of a pump apparatus for thereby implementing a sealing effect based on an oil pressure in the vacuum pump which includes a cylinder for sucking and compressing a gas from a vacuum facility by a rotor, an oil pump housing which protects an oil pump installed at an end portion of a rotor shaft and an oil pump cover.
REFERENCES:
patent: 3791780 (1974-02-01), Fritch et al.
patent: 5181414 (1993-01-01), Baret et al.
patent: 6149414 (2000-11-01), Abelen et al.
patent: 6190149 (2001-02-01), Richman
patent: 6409477 (2002-06-01), Blecker et al.
Birch & Stewart Kolasch & Birch, LLP
Patel Vinod D.
Woosung Vacuum Co., Ltd.
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