Driving pin structure for scroll compressor

Details Driving pin structure for scroll compressor Driving pin structure for scroll compressor

2002-01-11

2003-12-16

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

C418S055500, C418S057000

Reexamination Certificate

active

06663363

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor, and in particular to a structure of a driving pin for a scroll compressor which is capable of transmitting a rotational force by being combined with a rotating scroll.
2. Description of the Background Art
Generally, a compressor is for compressing a compressible fluid by using mechanical energy and can be divided into a reciprocating type, a scroll type, centrifugal type and a vane type, etc.
Unlike a reciprocating type compressor using a linear motion of a piston, a scroll type compressor (hereinafter, it is referred to as a scroll compressor) sucks, compresses and discharges gas by using a rotational body similar to a centrifugal type compressor and a vane type compressor.
FIG. 1
is a longitudinal sectional view illustrating the conventional scroll compressor.
As depicted in
FIG. 1
, the conventional scroll compressor includes a casing
1
filled with oil up to a certain height, a main frame
2
and a sub frame
3
respectively fixed to the upper and the lower portions of the inner circumference of the casing
1
, a driving motor
4
installed between the main frame
2
and the sub frame
3
and having a stator
4
A and a rotor
4
B, a rotational axis
5
placed so as to fit for the center of the rotor
4
B of the driving motor
4
and penetrating through the main frame
2
, a rotating scroll
6
combined with the rotational axis
5
and installed to the upper surface of the main frame
2
, a fixed scroll
7
fixed to the upper surface of the main frame
2
so as to form a plurality of compressing chambers by being coupled to the rotating scroll
6
, a high/low pressure division plate
8
installed to the upper portion of the fixed scroll
7
and dividing the inner space of the casing
1
into a suction pressure region and a discharge pressure region, and a counterflow prevention valve assembly
9
combined with the upper surface of the high/low pressure division plate
8
and preventing a counterflow of discharged gas.
FIG. 2
is a longitudinal sectional view illustrating a shape and an assembly state of a slide bush and a driving pin of the conventional scroll compressor.
As depicted in
FIG. 2
, in the rotational axis
5
, a driving pin
5
a
eccentrically projects from the upper end of the rotational axis
5
in order to rotate the rotating scroll
6
, and a slide bush
10
inserted into the boss
6
b
of the rotating scroll
6
is slides over the driving pin
5
a
inserted therein.
In addition, a sliding hole
10
a
having a guide surface (not shown) is formed at the inner circumference of the slide bush
10
. The sliding hole
10
a
is a relatively deep hole in order to permit a sliding-contact between a sliding surface (not shown) of the driving pin
5
a
and the sliding hole
10
a.
In
FIGS. 1 and 2
, reference numeral
6
a
is a wrap of the rotating scroll
6
, reference numeral
7
a
is a wrap of the fixed scroll
7
, and reference numeral DP is a discharge pipe.
The operation of the conventional scroll compressor will be described hereinafter.
When power is applied, the rotor
4
B rotates beside the stator
4
A together with the rotational axis
5
, and the driving pin
5
a
formed at the upper portion of the rotational axis
5
eccentrically rotates together. The rotating scroll
6
connected to the driving pin
5
a
rotates by the eccentric rotation of the driving pin
5
a
over an eccentric distance. A body capacity of the plurality of compressing chambers formed by the wraps
6
a
,
7
a
of the rotating scroll
6
and the fixed scroll
7
is decreased while being moved to the center portion by the continuous rotational motion of the rotating scroll
6
Accordingly, refrigerant gas is sucked, compressed and discharged by the compressor.
FIG. 3
is a perspective view illustrating a load distribution of the driving pin of the conventional scroll compressor.
However, in the conventional scroll compressor, the rotational force of the driving motor
4
is transmitted to the rotating scroll
6
by the driving pin
5
a
engaging the slide bush
10
. As depicted in
FIG. 3
, because the side surface of the driving pin
5
a
contacting the slide bush
10
receives a reactive force, a bending moment M
1
according to this contact acts on the driving pin
5
a
. Particularly, by the force and the moment acting on the side surface of the driving pin
5
a
, a stress acts on each surface of the driving pin
5
a
. The stress is especially concentrated on the start portion of the driving pin
5
a
, accordingly the driving pin
5
a
may be damaged due to the stress concentration when the scroll compressor is used for a long time.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problem, it is an object of the present invention to provide a driving pin structure for a scroll compressor which is capable of preventing a damage of a driving pin due to a stress concentration from happening by reducing a bending moment acted on the driving pin of a rotational axis.
In order to achieve the object of the present invention, in a scroll compressor comprising a fixed scroll having a wrap, a rotating scroll having a wrap engaged with the wrap of the fixed scroll and performing a rotational motion in a radial direction of the rotational axis of a driving device, a driving pin eccentrically formed at the rotational axis of the driving device and inserted into a boss of the rotating scroll and a bush member interposed between the boss of the rotating scroll and the driving pin, the driving pin has a length shorter than a length of the bush member.


REFERENCES:
patent: 5370512 (1994-12-01), Fujitani et al.
patent: 5547355 (1996-08-01), Watanabe et al.
patent: 6053714 (2000-04-01), Fenocchi et al.
patent: 6386847 (2002-05-01), Bush et al.
patent: 03105001 (1991-05-01), None
patent: 05125901 (1993-05-01), None
patent: 06010872 (1994-01-01), None

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