Pumps – With muffler acting on pump fluid
Reexamination Certificate
2001-12-04
2003-11-04
Freay, Charles G. (Department: 3746)
Pumps
With muffler acting on pump fluid
C417S415000, C181S214000, C181S403000
Reexamination Certificate
active
06641374
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hermetic motor-driving type compressor, and in particular to a head cover structure of a hermetic motor-driving type compressor which is capable of preventing leakage of a refrigerant gas at a high-pressure side and a low-pressure side and precisely combining a suction muffler to a head cover with reduced production costs.
2. Description of the Prior Art
Generally, a compressor pressurizes a fluid such as air and a refrigerant gas, etc. A compressor includes a driving unit placed inside a closed container and generating a driving force and a compressing unit being transmitted the driving force from the driving unit, sucking and compressing a refrigerant gas. In the compressor, when a driving force is generated in the driving unit by being applied power, the driving force is transmitted to the compressing unit, the compressing unit sucks a gas, compresses and discharges it.
In addition, a head cover structure used for the conventional hermetic motor-driving type compressor is divided into a high-pressure side and a low-pressure side in which a working fluid flows by an enclosure wall, and a suction muffler is installed at the low-pressure side.
As depicted in
FIG. 1
, a general hermetic motor-driving type compressor includes a closed container
1
formed by combination of an upper container
1
a
and a lower container
1
b,
and a motor driving unit and a compressing unit are formed inside the closed container
1
.
The driving unit includes a stator
3
, a plurality of springs
2
s
fixedly combined between the stator
3
and the bottom surface of the closed container
1
and elastically supporting the stator
3
, and a rotator
4
placed so as to have a certain distance from the stator
3
.
In the meantime, the compressing unit includes a hollow crank shaft
5
inserted-combined to the center of the rotator
4
, a frame
2
combined between the upper portion of the crank shaft
5
and the upper inner circumference of the rotator
4
, a balance weight
5
c
combined to the end of the crank shaft
5
, an eccentric pin
5
b
installed at the upper surface of the balance weight
5
c
, a connecting rod
8
combined to a piston
7
slide-inserted into a cylinder
6
formed at the upper surface of the frame
2
and converting a rotation motion of the crank shaft
5
into a linear motion of the piston
7
, a valve assembly
9
combined so as to cover a certain surface of the cylinder
6
, and a head cover
10
combined to the valve assembly
9
.
In the meantime, a piece
5
e
is inserted into the lower portion of the hollow crank shaft
5
in order to suck up oil L from the lower surface of the closed container
1
, the sucked oil L is scattered in all internal spaces of the compressor through an oil channel
5
a
connected from the upper portion of the piece
5
e
to the internal space of the eccentric pin
5
b.
And, the working fluid is supplied to a compressing chamber
6
′ of the cylinder
6
through a certain side of the head cover
10
, a certain side of a suction muffler
11
reducing noise in suction is combined to the head cover
10
, and the other side of the suction muffler
11
is connected to a suction pipe
12
suctioning the working fluid and a discharge pipe
23
discharging the compressed working fluid.
Moreover, the suction muffler
11
is made of a plastic material.
Hereinafter, the head cover structure of the conventional hermetic motor-driving type compressor will be described with reference to accompanying FIG.
2
.
As depicted in
FIG. 2
, by an enclosure wall
10
p,
the internal space of the head cover
10
is divided into a lower pressure part
10
b
sucking a low-pressure working fluid by being mounted the suction muffler
11
and a high-pressure part
10
t
discharging the working fluid compressed in the compressing chamber
6
′.
And, a gasket
13
and a valve plate
14
of the valve assembly
9
are orderly combined between the head cover
10
and the cylinder
6
. In addition, the gasket
13
prevents leakage of the working fluid between the head cover
10
and the valve plate
14
, particularly it prevents the leakage of the working fluid between portions corresponded to the upper surface
10
g
of the enclosure wall lop and the valve plate
14
.
Hereinafter, the operations of the conventional hermetic motor-driving type compressor and the head cover will be described.
In the conventional hermetic motor-driving type compressor, when power is applied, the rotator
4
rotates by the electromagnetic interaction between the rotator
4
and the stator
3
, and the crank shaft
5
constructed so as to be one-bodied with the rotator
4
also rotates.
By the operation, the eccentric pin
5
b
formed to be offset from a center of rotation of the crank shaft
5
performs the rotation circle motion, the connecting rod
8
connected to the eccentric pin
5
b
works together, and the piston
7
performs a linear reciprocating motion.
By the linear reciprocating motion of the piston
7
, the working fluid is compressed in the compressing chamber
6
′ of the cylinder
6
, the compressed working fluid is discharged from the compressing chamber
6
′, passes the valve plate
14
and reaches the high pressure side
10
t
of the head cover
10
. And, the working fluid that reached the high-pressure side passes an additional discharge path (not shown) and a discharge noise reducing structure (not shown) and is discharged outside through the discharge pipe
23
.
In the meantime, a low-pressure working fluid passes the suction muffler
11
through the suction pipe
12
, reaches the valve plate
14
and flow into the compressing chamber
6
′ by the control of the valve plate
14
.
However, the head cover structure of the hermetic motor-driving type compressor in accordance with the prior art has problems as follows.
The head cover
10
is injection-molded out of aluminum or is cast, when the head cover
10
is molded out of aluminum, production costs may be increased due to the cost of materials. When the head cover
10
is cast, because a precise additional process for creating a flat surface
10
a
of the head cover
10
is required, production costs may be increased.
In addition, in the injection molding of the head cover
10
, a bend is generated at the flat surface
10
a
due to heat distortion caused by a non-uniform cooling. Accordingly, there is a gap between the head cover
10
and the valve plate
14
, a leakage of the working fluid occurs by the pressure difference between the high-pressure side lot and the low-pressure side
10
b
of the head cover
10
, causes a pumping efficiency problem and abnormal operation of the compressor.
And, when a leakage of the working fluid occurs at the head cover
10
, because the suction muffler
11
made of plastic material melts under the influence of the high temperature-high-pressure working fluid transmitted from the high-pressure side
10
t
or the gasket
13
ruptures, problems could be caused for the compressor.
In the meantime, in the injection-molding or casting of the head cover
10
, because a burr occurs at the external boundary surface, an interference occurs in the combination of the suction muffler
11
and the lower pressure side
10
b
of the head cover
10
.
And, a height of the head cover
10
is different from a mounting height of the suction muffler
11
, when the head cover
10
mounted with the suction muffler
11
is installed to the cylinder
6
, a gap occurs between the head cover
10
and the suction muffler
11
, accordingly a leakage of the working fluid may occur.
In order to solve the above-mentioned problems, the mold of the head cover has to be modified or has to be made anew, accordingly, an enormous expense loss may occur.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, it is an object of the present invention to provide a head cover structure for a hermetic motor-driving type compressor, which is capable of reducing the cost of materials.
It is another
Belena John F.
Freay Charles G.
LG Electronics INC
Ostrolenk Faber Gerb & Soffen, LLP
LandOfFree
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