Pumps – Successive stages
Reexamination Certificate
2000-09-14
2003-04-15
Freay, Charles G. (Department: 3746)
Pumps
Successive stages
C417S266000, C092S172000, C092S060500
Reexamination Certificate
active
06547534
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a high-pressure compressor of a compression type provided with a compression mechanism for compressing a sucked operating fluid to generate a high-pressure operating fluid, particularly to an improvement of a compression mechanism for reciprocating/driving a piston with respect to a cylinder by rotation of a motor.
For a high-pressure compressor of a compression type provided with a compression mechanism for reciprocating/driving a piston with respect to a cylinder by rotation of a motor and compressing an operating fluid sucked by the driving to generate a high-pressure operating fluid, as the invention by the present applicant, a multistage compression apparatus (hereinafter referred to the prior art) is disposed as one high-pressure gas compressor invented before the application date of the present application, for example, in Japanese Patent Application Laid-Open No. 81780/1999.
The prior art will be described hereinafter based on
FIGS. 1
to
4
. A multistage compression apparatus
100
constitutes a four-stage compressor provided with four compression sections (compression stages)
101
,
102
,
103
,
104
. The compression sections
101
and
103
are arranged on a horizontal axis
106
, the compression sections
102
and
104
are arranged on a horizontal axis
105
, and a reciprocating compression mechanism is constituted in which a piston as a movable member reciprocates/operates on these axes
106
,
105
in a cylinder as a fixed member. Thereby, the operating fluid sucked via a suction pipe
118
is compressed in the first compression section
101
, subsequently the operating fluid compressed in the first compression section
101
is passed via a pipeline
5
into the second compression section
102
and compressed, the operating fluid compressed in the second compression section
102
is passed via a pipeline
6
into the third compression section
103
and compressed, the operating fluid compressed in the third compression section
103
is passed via a pipeline
7
into the fourth compression section
104
and compressed, and the high-pressure operating fluid provided with a predetermined pressure and flow rate in this manner is discharged via a discharge pipe
8
.
Examples of the operating fluid in the multistage compression apparatus
100
include nitrogen, natural gas, sulfur hexafluoride (SF6), air, and other so-called gases, and the multistage compression apparatus
100
is applied to a natural gas charging machine to a car bomb using a natural gas, high-pressure nitrogen gas supply to a gas injection molding machine using a high-pressure nitrogen gas during injection molding of synthetic resin, a charging machine of high-pressure air to an air bomb, and the like.
In the multistage compression apparatus
100
, a piston
51
in the first compression section
101
and a piston
53
of the third compression section
103
are connected to a yoke
1
A on the axis
106
, and a cross slider
2
A movably disposed to cross the axis
106
in the yoke
1
A is connected to a crank shaft
4
via a crank pin
3
. The axis
105
forms an angle of 90 degrees with the axis
106
in a vertical view. Moreover, a piston
52
of the second compression section
102
and a piston
54
of the fourth compression section
104
are connected to a yoke
1
B on the axis
105
, and a cross slider
2
B movably disposed to cross the axis
105
in the yoke
1
B is connected to the crank shaft
4
via the crank pin
3
.
The crank shaft
4
is rotated by an electric motor (not shown) disposed below the compression sections
101
to
104
, the crank pin
3
disposed on the crank shaft
4
in an eccentric manner is rotated around the crank shaft
4
, with respect to the yoke
1
A the cross slider
2
A moves to handle displacement of the crank pin
3
in a direction of axis
105
, the yoke
1
A moves to handle the displacement of a direction of axis
106
, and the pistons
51
,
53
reciprocate only in the direction of the axis
106
.
On the other hand, with respect to the yoke
1
B, the cross slider
2
B moves to handle the displacement of the crank pin
3
in the direction of axis
106
, the yoke
1
B moves to handle the displacement of the direction of axis
105
, and the pistons
52
,
54
then reciprocate only in the direction of the axis
105
.
FIG. 4
is a sectional view showing a structure of the first compression section
101
of the multistage compression apparatus
100
. The first compression section
101
is provided with a first compression chamber
58
and a second compression chamber
59
before and after the piston
51
. When the piston
51
advances and valves a, b are closed, the operating fluid is sucked into the first compression chamber
58
via opened valves e, f from directions shown by arrows. Additionally, when the operating fluid of the second compression chamber
59
is compressed to reach a predetermined pressure, the fluid is discharged to the outside via opened valves c, d, and fed to the next second compression section
102
via the pipeline
5
as shown by an arrow.
Subsequently, when the piston
51
moves backward, the valves e, f are closed, the operating fluid in the first compression chamber
58
is compressed to reach the predetermined pressure and open the valves a, b, and the operating fluid is discharged to the second compression chamber
59
. Numeral
60
denotes a rod guide for smoothly guiding a connecting rod
57
to a predetermined position so that no vibration occurs.
As described above, the first compression section
101
of the multistage compression apparatus
100
is a double compression mechanism (double action mechanism) structured to suck, compress and discharge the operating fluid in two stages in one cylinder
55
. The second, third and fourth compression sections
102
,
103
,
104
do not comprise the double compression mechanism like the first compression section
101
, and comprise a so-called single action mechanism constituted to perform a usual operation of compressing the gas sucked into the cylinder in one stage in the reciprocating motion of the piston with respect to the cylinder.
In the aforementioned constitution, a nitrogen gas as the operating fluid sucked via the suction pipe
118
indicates a pressure of about 0.05 MPa (G), and is compressed by the first compression section
101
until the pressure indicates about 0.5 MPa (G), and the compressed nitrogen gas is supplied to the second compression section
102
via the pipeline
5
. The nitrogen gas is compressed to indicate about 2 MPa (G) in the second compression section
102
, and the compressed nitrogen gas is supplied to the third compression section
103
via the pipeline
6
. The nitrogen gas is compressed to indicate about 7 to 10 MPa (G) in the third compression section
103
, and the compressed nitrogen gas is supplied to the fourth compression section
104
through the pipeline
7
. In the fourth compression section
104
, the high-pressure gas (high-pressure operating fluid) compressed to indicate about 20 to 30 MPa (G) is supplied to an accumulator via the discharge pipe
8
, and the high-pressure nitrogen gas is supplied to a gas injection molding machine from the accumulator.
In the aforementioned prior art, as a first constitution, for the pistons
53
,
54
of the third and fourth compression sections
103
and
104
, as shown in FIG.
5
and
FIG. 6
as an enlarged view of a circle P of
FIG. 5
, a plurality of labyrinth grooves
70
are formed in the peripheral surfaces of the pistons
53
,
54
, in the compression mechanism, a gap of 2 to 6 &mgr;m (micrometers) is formed between the piston
53
,
54
and a liner cylinder
73
A,
74
A disposed on the inner surface of the cylinder
73
,
74
, and the gas flowing through the gap flows into the labyrinth groove
70
and generates a turbulence for a gas sealing system to form a so-called non-lubricating labyrinth seal structure. Moreover, a tip end peripheral edge
75
of the piston
53
,
54
is obliquely and linearly chamfered, so-called C-chamfer
Aida Makoto
Mizuno Takayuki
Nishikawa Hiroshi
Nishikawa Takahiro
Sakamoto Yasuo
Darby & Darby
Freay Charles G.
Liu Han L.
Sanyo Electric Co,. Ltd.
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