Pumps – Expansible chamber type – Pumping member position controlled port
Reexamination Certificate
2002-05-07
2004-06-29
Yu, Justine R. (Department: 3746)
Pumps
Expansible chamber type
Pumping member position controlled port
C417S520000
Reexamination Certificate
active
06755630
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a compressing apparatus, and more particularly, to an apparatus for compressing, pumping, and discharging fluid by using a reciprocal linear movement of a piston.
2. Description of the Related Art
One typical example of a conventional apparatus for compressing fluid is shown in
FIGS. 1 and 2
.
FIGS. 1 and 2
are views schematically showing in cross-section, the structure and operation of a conventional apparatus for compressing fluid. The reference numeral
10
indicates a cylinder block,
20
indicates a piston,
30
indicates a valve plate, and
40
indicates a cylinder head.
As shown in
FIGS. 1 and 2
, the cylinder block
10
has a cylinder bore
11
with a predetermined diameter penetrating thereof in a lengthwise or longitudinal direction. The piston
20
is disposed within the cylinder bore
11
of the cylinder block
10
in order to move reciprocally therein.
The valve plate
30
is disposed adjacent the cylinder block
10
. The valve plate
30
has a fluid suction hole
31
and a fluid discharge hole
32
disposed therein. In addition, the valve plate
30
has a suction valve
33
(most clearly shown in phantom in
FIG. 2
) and a discharge valve
34
(most clearly shown in
FIG. 1
) disposed thereon for opening and closing the fluid suction hole
31
and the fluid discharge hole
32
, respectively.
Furthermore, the cylinder head
40
is disposed at the cylinder block
10
at a side where the valve plate
30
is disposed, and has a fluid suction chamber
41
and a fluid discharge chamber
42
disposed thereon. The fluid suction chamber
41
and the fluid discharge chamber
42
are each associated with the fluid suction hole
31
and the fluid discharge hole
32
, respectively, of the valve plate
30
. Moreover, a fluid suction manifold
43
and a fluid discharge manifold
44
, which communicate with the fluid suction chamber
41
and the fluid discharge chamber
42
, respectively, are connected with the cylinder head
40
.
In the conventional apparatus for compressing the fluid having the above structure, a fluid is drawn, compressed, and discharged by the piston
20
reciprocally moving within cylinder bore
11
by receiving power provided from a piston driving source (not shown). The piston
20
moves in the cylinder bore
11
of the cylinder block
10
.
More specifically, when the piston
20
moves from a top dead point T (
FIG. 1
) of the cylinder bore
11
to a bottom dead point B (
FIG. 2
) of the cylinder bore
11
, the suction valve
33
opens the suction hole
31
of the valve plate
30
as a result of a difference in pressure between the inside of the cylinder bore
11
and the inside of fluid suction chamber
41
, as shown in FIG.
2
. Therefore, the fluid is drawn into the inside of the cylinder bore
11
of the cylinder block
10
through the suction manifold
43
, the suction chamber
41
of the cylinder head
40
, and the suction hole
31
of the valve plate
30
. The pressure in the discharge chamber
42
of the cylinder head
40
is higher than that of the inside of the cylinder bore
11
, thus the discharge valve
34
is retained in a closed position (as shown in FIG.
2
), thus closing off the discharge hole
32
.
On the other hand, when the piston
20
moves from the bottom dead point B (
FIG. 2
) of the cylinder bore
11
to the top dead point T (
FIG. 1
) of the cylinder bore
11
, then the fluid, drawn into the cylinder bore
11
during the piston downstroke, is gradually compressed. Finally, as shown in
FIG. 1
, when the piston
20
reaches the top dead point T, the pressure in the cylinder bore
11
becomes higher than that of the discharge chamber
42
of the cylinder head
40
, thus the discharge valve
34
opens the discharge hole
32
of the valve plate
30
. Accordingly, the compressed fluid is discharged through the discharge hole
32
of the valve plate
30
, into the discharge chamber
42
of the cylinder head
40
, and out through the discharge manifold
44
. At this time, the pressure of the suction chamber
41
of the cylinder head
40
is lower than that of the cylinder bore
11
, thus the suction valve
33
is retained in a closed position (as shown in FIG.
1
), thus closing off the suction hole
32
.
Furthermore, when the piston
20
moves again to the bottom dead point B, the suction hole
31
is opened by the suction valve
33
, and the discharge hole
32
is closed by the discharge valve
34
, thus causing fluid to be drawn from the suction chamber
41
. After that, when the piston
20
moves again to the top dead point T, the drawn fluid is repeatedly compressed and discharged, in a continuously operating cycle.
However, in the conventional apparatus for compressing the fluid as described so far, the fluid compressed by the piston
20
is not fully discharged. Some of the compressed fluid is left in the discharge hole
32
of the valve plate
30
, Therefore, while the fluid is being drawn, in other words, when the piston
20
moves from the top dead end point T to the bottom dead end point B, the remaining fluid, at a high pressure, is re-expanded as the piston
20
moves in its downstroke. Owing to the re-expanded high pressure fluid, in the beginning of the fluid drawing sequence, in other words, when the piston
20
moves to the bottom dead end point B, the pressure of the cylinder bore
11
is lower than that of the discharge chamber
42
of the cylinder head
40
, but the pressure is higher than that of the suction chamber
41
. Therefore, at the time when the piston
20
starts its downstroke, moving to the bottom dead end point B, suction does not immediately occur. Yet, after the pressure of the cylinder bore
11
becomes lower than that of the suction chamber
41
, as the piston
20
fully moves to the bottom dead end point B, the suction valve
33
is opened and new fluid is drawn. Consequently, in the conventional apparatus for compressing the fluid, as the high pressure fluid remaining in the suction hole
32
creates a clearance volume of the cylinder bore
11
during every stroke cycle, the amount of the fluid drawn into cylinder bore
11
is decreased and results in a deterioration in efficiency.
Moreover, since the conventional apparatus for compressing the fluid must employ the suction valve
33
and the discharge valve
34
having a complex structure for opening the suction hole
31
and the discharge hole
32
, assembly of the compressor apparatus is complicated. Furthermore, it does not lend itself to a good production method and also the construction results in high production costs.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an apparatus for compressing fluid capable of improving efficiency by removing the clearance volume found in a conventional cylinder bore as compressed fluid is fully discharged.
Another object of the present invention is to provide an apparatus for compressing fluid capable of reducing the production cost and improving the ease of assembly and the manufacturing productivity as the compressing apparatus is constructed, by providing a piston that opens and closes a fluid suction port without having a separate suction valve device and by providing a discharge valve assembly having a simple structure.
The above objects are accomplished by providing an apparatus for compressing a fluid comprising: a cylinder block including a cylinder bore with a predetermined diameter penetrating the cylinder block in a lengthwise direction, at least one fluid suction port penetrating in an intersecting direction with the cylinder bore, and at least a pair of fluid discharge ports, each discharge port having a slot shape with one opening formed at an end portion of the cylinder bore; a piston for reciprocally moving in the cylinder bore of the cylinder block; a discharge valve assembly movably disposed at the cylinder bore in order to selectively open and close the fluid discharge ports of the cylinder block, the discharge valve assembly including a valve piston having a fla
Jang Kyung-tae
Kim Gui-gwon
Lee Sung-tae
Ladas & Parry
Liu Han L
Samsung Gwangju Electronics Co. Ltd.
Yu Justine R.
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