Dual cylinder apparatus for reciprocal hermetic compressor

Details Dual cylinder apparatus for reciprocal hermetic compressor Dual cylinder apparatus for reciprocal hermetic compressor

2002-09-13

2004-05-11

Yu, Justine R. (Department: 3746)

Pumps

Expansible chamber type

Plural pumping chambers

C417S527000

Reexamination Certificate

active

06733257

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a reciprocal hermetic compressor, and more particularly, to a dual cylinder apparatus for a reciprocal hermetic compressor.
BACKGROUND OF THE INVENTION
Generally, as shown in
FIG. 1
, a reciprocal hermetic compressor includes a motor unit
1
having a stator
2
, a rotor
4
rotatably disposed around the stator
2
, a crankshaft
6
, a connecting rod
8
and a cylinder apparatus
10
.
The crankshaft
6
is connected to and rotated with the rotor
4
, and has an eccentric portion
6
a
formed at a lower portion. The eccentric portion
6
a
is connected to a large diameter portion
8
a
formed on an end of the connecting rod
8
. A small diameter portion
8
b
is formed on the other end of the connecting rod
8
, and is connected to a piston
9
.
As shown in
FIG. 2
, the cylinder apparatus
10
includes a cylinder body
111
in which the piston
9
is reciprocally inserted, a cylinder head
13
provided on one side of the cylinder body
11
, and a valve plate
15
disposed between the cylinder body
11
and the cylinder head
13
. The valve plate
15
has a refrigerant discharge hole
15
a
which is opened and closed by a discharge valve
16
, and a refrigerant suction hole
15
b
which is opened and closed by a suction valve
17
.
In the above-described invention, the piston
9
is reciprocated by the movement of the connecting rod
8
, which compresses and expands the refrigerant inside of a cylinder chamber
11
a
. When the piston
9
retreats, the suction valve
17
is opened and the discharge valve
16
is closed. Accordingly, the refrigerant is drawn into the cylinder chamber
11
a
. When the piston
9
advances, the suction valve
17
is closed and the discharge valve
16
is opened. As a result, the refrigerant inside of the cylinder chamber
11
a
is compressed and discharged.
The above structure is an example of a cylinder apparatus in which the refrigerant is drawn into and then discharged from the cylinder body
11
during every one rotation of the crankshaft
6
. This type of cylinder apparatus has a relatively low efficiency and increased noise level due to the vibration and unbalanced refrigerant suction/discharge.
SUMMARY AND OBJECTS OF THE INVENTION
Accordingly, it is an object of the present invention to provide a cylinder apparatus for a hermetic compressor, having an improved structure in which refrigerant discharge and suction are performed twice during one rotation of a crankshaft.
The above object is accomplished by providing a dual cylinder apparatus for a reciprocal hermetic compressor comprising a cylinder body having two open ends with a pair of valve plate units disposed at both ends of the cylinder body, the valve plate units having refrigerant discharge holes formed therein. A pair of pistons are movably disposed in the cylinder body to reciprocate inside of the cylinder body. A piston bar having one end connected to a connecting rod is slidably supported on the valve plate units to reciprocate thereon while supporting the pistons. The piston bar includes a refrigerant discharge hole through which a refrigerant is discharged from in between the pistons to outside the pistons. A discharge valve is movably disposed between the pistons, the discharge valve opening a first gap between one of the pistons and the cylinder body and closing a second gap between the other piston and cylinder body.
The pair of pistons are connected to the piston bar at a predetermined distance from each other, with each having a diameter smaller than an inner diameter of the cylinder body.
The pair of valve plate units include valve plates connected at both ends of the cylinder body to close the ends, the valve plates having refrigerant discharge holes and suction valves disposed on their opposing inner surfaces to selectively open and close the refrigerant discharge holes, according to an advancement and a retreat of the pistons.
The discharge valve includes a pair of ring-type valves movably disposed between the pair of pistons in close contact with an inner surface of the cylinder body. Springs connect the ring-type valves such that the ring-type valves are moved closer or further away from each other by an external pressure. The ring-type valves are compressed during both the advancement and retreat of the pistons, opening the first gap between one of the pistons and an inner surface of the cylinder body, while closing the second gap between the other piston and inner surface of the cylinder body. Each ring-type valve has a diameter that is greater than the diameter of the pair of pistons so that the ring-type valve can seal the gap between the piston and the inner surface of the cylinder body.


REFERENCES:
patent: 5597293 (1997-01-01), Bushnell et al.
patent: 5775882 (1998-07-01), Kiyokawa et al.
patent: 6000500 (1999-12-01), Oh
patent: 6276911 (2001-08-01), Krusche et al.
patent: 6287092 (2001-09-01), Calciolari et al.
patent: 6540490 (2003-04-01), Lilie

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