Lubrication – Systems – Vertical shaft
Reexamination Certificate
1997-10-24
2001-02-06
Williams, C. (Department: 3682)
Lubrication
Systems
Vertical shaft
C092S153000
Reexamination Certificate
active
06182794
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a propeller structure for a hermetically sealed compressor, and more particularly to an improved propeller structure for a hermetically sealed compressor capable of enhancing an oil supply capacity and minimizing a whirling sound and a dropping noise which may occur during rotation of a piece and a propeller thereof, by gradually broadening a wing of the propeller in width from bottom to top.
2. Description of the Prior Art
As shown in
FIG. 1
, a conventional hermetically sealed compressor includes a hermetic container
1
having an upper and lower cells
1
a
,
1
b
, and a motor unit
3
provided in the hermetic container
1
and having a rotor
3
a
and a stator
3
b.
An end of each of a plurality of support springs
4
is connected at a side portion along an inner periphery of the lower cell
1
b
, and another end of each of the support springs
4
supports a frame
2
.
A crank shaft
5
having an eccentric portion
6
at an upper portion thereof is heat-inserted into the hole in the rotor
3
a
. A cylinder
7
is connected to an upper portion of the frame
2
.
A piston
8
that horizontally shuttles in the cylinder
7
is engaged to the eccentric portion
6
of the crank shaft
5
.
A valve plate
9
is attached onto an end portion of the cylinder
7
, and a head cover
10
is attached onto the valve plate
9
. A suction muffler (not shown) is mounted on a portion of the head cover
10
.
With reference to
FIG. 2
, in order to suck a oil “O” in through the crank shaft
5
, a cylinder type oil guide piece
11
is pressure-inserted into the crank shaft
5
which becomes rotated in accordance with the rotor
3
a.
An oil suction propeller
12
is fixedly inserted into the oil guide piece
11
.
At this time, respective widths of an upper and lower wings
12
a
,
12
b
comprising the suction propeller
12
are identical to each other, and the lower wing
12
b
of the oil suction propeller
12
is dipped in the oil “O”.
The oil “O” kept in a lower portion of the hermetic container
1
is upwardly sucked by the rotation of the crank shaft
5
and scattered over the crank shaft
5
. The scattered oil “O” is soaked through respective friction portions in the compressor for thereby preventing overheating and abrasion.
The oil sucking steps of the thusly constituted hermetically sealed compressor will now be described with reference to FIG.
2
.
First, when an electrical power is supplied to the hermetically sealed compressor, the rotor
3
a
starts its rotation. Accordingly, as the crank shaft
5
heatinserted into the rotor
3
a
becomes rotated, the oil guide piece
11
and the oil suction propeller
12
become rotated. The thusly generated centrifugal force and an thrust force serve to upwardly suck the oil “O”. At this time, the centrifugal force and the thrust force are variable depending on respective diameters of the oil guide piece
11
and the oil suction propeller
12
.
That is, the more increased become the respective diameters of the upper and lower oil suction propeller wings
12
a
,
12
b
, the stronger the centrifugal force and the thrust force, and the more oil “O” is upwardly sucked. To the contrary, as the respective diameters of the upper and lower oil suction propeller wings
12
a
,
12
b
become smaller, so does the amount of the oil “O” being upwardly sucked resulting from the decreased centrifugal force and the thrust force.
However, in the oil suction propeller structure of the conventional hermetically-sealed compressor, as shown in
FIG. 3
, although the sucked-up amount of the oil becomes increased when the respective diameters of the oil guide piece and the oil suction propeller are increased, the oil portion that is in contact with the outer periphery of the oil guide piece may be whirled during the oil suction propeller rotation for thereby generating noise caused by a whirling and a dropping of the oil “O”.
Further, when the respective diameters of the oil guide piece and the oil suction propeller are decreased for preventing the whiling and dropping noise, the centrifugal force and the thrust force are also decreased, for thereby deteriorating an oil supplying capacity.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an oil suction propeller structure for a hermetically sealed compressor for minimizing a whirling and dropping noise that may occur due to a whirl current of an oil during a rotation of an oil guide piece and an oil suction propeller as well as preventing the oil supply capacity from being deteriorated.
To achieve the above-described object, there is provided an oil suction propeller structure for a hermetically sealed compressor according to the present invention which includes a rotor, a crank shaft pressure-inserted in the rotor, an oil guide piece pressure-inserted in a lower portion of the crank shaft, a lower wing fixedly inserted in the oil guide piece and soaked in an oil, an upper wing having a width thereof wider than that of the lower wing, and an intermediate portion extending from the lower wing and gradually broadening in width toward the upper wing.
REFERENCES:
patent: 4209080 (1980-06-01), Douglas
patent: 4375944 (1983-03-01), Wolf
patent: 4865527 (1989-09-01), Piera et al.
patent: 5228843 (1993-07-01), Novolan et al.
patent: 5498143 (1996-03-01), Dreiman et al.
patent: 5803718 (1998-09-01), Woo
patent: 50-87512 (1948-12-01), None
patent: 58-131394 (1983-08-01), None
patent: 61-8491 (1986-01-01), None
Kim Chong H.
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Williams C.
LandOfFree
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