Pumps – With muffler acting on pump fluid
Reexamination Certificate
2000-08-23
2003-09-30
Freay, Charles G. (Department: 3746)
Pumps
With muffler acting on pump fluid
C181S229000, C181S230000, C181S403000
Reexamination Certificate
active
06626648
ABSTRACT:
TECHNICAL FIELD
The present invention relates, in general, to hermetic compressors and, more particularly, to an apparatus for depreciating a noise of highly compressed working fluid in such hermetic compressors.
BACKGROUND ART
FIG. 1
shows the internal construction of a conventional hermetic compressor having a connecting rod.
As shown in the drawing, the conventional hermetic compressor comprises a hermetic housing
1
consisting of upper and lower casings
1
t
and
1
b,
with a sealed cavity being formed within the housing
1
and a frame
2
being set within the sealed cavity of the housing
1
. A stator
3
is fixedly mounted to the frame
2
and electromagnetically rotates a rotor
4
integrated with a crankshaft
5
, thus finally rotating the crankshaft
5
. The construction of the rotor
4
will be described in detail later herein. The above frame
2
is held in the hermetic housing
1
by a spring
2
S.
The crankshaft
5
is installed within the hermetic housing
1
while passing through the central portion of the frame
2
, while the rotor
4
is integrated with the crankshaft
5
into a single structure. The above rotor
4
is electromagnetically rotated along with the crankshaft
5
in cooperation with the stator
3
.
An eccentric pin
5
b
is provided on the upper end of the crankshaft
5
while being eccentric from the rotating axis of the crankshaft
5
. A balance weight
5
c
is provided on the crankshaft
5
at a position opposite to the eccentric pin
5
b.
Provided on the lower end of the crankshaft
5
is a pump
5
d,
which generates pumping force for sucking lubrication oil L from the bottom of the lower casing
1
b
of the housing
1
to an oil passage
5
a
of the crankshaft
5
.
On the other hand, a cylinder
6
, having a compression chamber
6
′, is integrated with the frame
2
into a single structure, with a piston
7
being set in the compression chamber
6
′ of the cylinder
6
. The above piston
7
is connected to the eccentric pin
5
b
of the crankshaft
5
through a connecting rod
8
. In such a case, the eccentric pin
5
b
of the crankshaft
5
is connected to a crankshaft connection part
8
a
of the connecting rod
8
, while the piston
7
is connected to a piston connection part
8
b
of the connecting rod
8
through a piston pin
7
′.
A valve assembly
9
is installed on the end of the cylinder
6
. This valve assembly
9
controls a flowing of working fluid, or refrigerant, which is sucked into and exhausted from the compression chamber
6
′ of the cylinder
6
. A head cover
10
is mounted to the valve assembly
9
so as to form an exhaust chamber
10
′ (see FIG.
3
), through which the working fluid passes after being exhausted from the compression chamber
6
′. In the drawing, the reference numeral
12
denotes a suction pipe used for sucking the working fluid into the hermetic housing
1
, and the reference numeral
13
denotes an exhaust pipe used for discharging the compressed working fluid from the compressor into the outside of the compressor.
In the above compressor, a suction muffler
11
is installed within the hermetic housing
1
while communicating with the compression chamber
6
′ of the cylinder
6
through the valve assembly
9
. The above suction member
11
is used for educing operational noises of the working fluid.
The above compressor also has a device for muffling exhaust operational noises of compressed and exhausted working fluid during an operation of the compressors. The construction of this muffling device is shown in
FIGS. 2
to
4
. As shown in the drawings, a fluid exhaust passage
14
is formed in the compressor while passing through the cylinder
6
and communicates with the exhaust chamber
10
′ formed by the head cover
10
. A muffling unit
16
is formed on the frame
2
and receives the working fluid flowing from the exhaust passage
14
. A chamber cover
17
is mounted to the frame
2
, thus defining a muffling chamber
16
′ of the muffling unit
16
. The exhaust operational noises of the compressed working fluid is practically reduced within the muffling chamber
16
′. A loop pipe
18
is installed on the muffling unit
16
while passing through the chamber cover
17
.
In the above muffling unit
16
, the chamber cover
17
is locked to the frame
2
by a locking bolt
19
, thus forming the desired muffling chamber
16
′ of the muffling unit
16
. The above locking bolt
19
is tightened to the locking boss
16
b
formed on the frame
2
. A diaphragm
21
is installed within the muffling chamber
16
′ of the muffling unit
16
so as to divide the muffling chamber
16
′ into two parts. The object of such a division of the muffling chamber
16
′ by the diaphragm
21
is to improve the noise-muffling effect of the muffling unit
16
.
The above diaphragm
21
has a hole
22
at its center, thus allowing the two parts of the muffling chamber
16
′ to communicate with each other through the hole
22
. The above hole
22
also allows the locking bolt
19
to pass through prior to being tightened to the locking boss
16
b
of the frame
2
. The diaphragm
21
is thus locked to the frame
2
along with the chamber cover
17
by the locking bolt
19
.
In order to prevent a leakage of working fluid from the muffling chamber
16
′ of the unit
16
, two packing rings
20
and
20
′ are closely interposed between the frame
2
, the chamber cover
17
and the upper and lower surfaces of the edge of the diaphragm
21
as best seen in
FIG. 4. A
sealing washer
19
′ is fitted over the shank of the locking bolt
19
, thus being closely positioned at the junction between the bolt head and the top center of the chamber cover
17
and sealing the junction when the bolt
19
is fully tightened to the locking boss
16
b
of the frame
2
along with the chamber cover
17
.
In an operation of the above hermetic compressor, compressed working fluid is discharged from the compression chamber
6
′ of the cylinder
6
as follows. That is, the working fluid, compressed by the piston
7
within the compression chamber
6
′, is discharged from the chamber
6
′ into the exhaust chamber
10
′, formed by the head cover
10
, through the valve assembly
9
, used as an exhaust valve.
The compressed working fluid is, thereafter, fed to the muffling chamber
16
′ through the fluid exhaust passage
14
formed in the cylinder
6
. In the muffling chamber
16
′, the working fluid orderly passes through the two parts of the chamber
16
′, thus being reduced in pulse of pressure wave prior to being discharged from the muffling chamber
16
′ into the outside of the hermetic housing
1
through the loop pipe
18
.
However, the conventional apparatus for noise depreciating of compressed working fluid in a hermetic compressor is problematic as follows due to the fact that it is somewhat difficult to lock both the chamber cover
17
and the diaphragm
21
to the locking boss of the frame using the locking bolt
19
, thus reducing work efficiency while forming a desired apparatus for depreciating noises in the compressor.
That is, in order to mount both the chamber cover
17
and the diaphragm
21
to the frame
2
, the first packing ring
20
′ is laid on the frame
2
at a position around the muffling unit
16
prior to laying the diaphragm
21
on the packing ring
20
′. Thereafter, the second packing ring
20
is laid on the edge of the diaphragm
21
prior to laying the chamber cover
17
on said packing ring
20
. The chamber cover
17
is, thereafter, fully locked to the locking boss
16
b
of the frame
2
by the locking bolt
19
along with the diaphragm
21
and the two packing rings
20
and
20
′.
However, it is very difficult to precisely array the chamber cover
17
, the two packing rings
20
and
20
′ and the diaphragm
21
with each other or to keep the primarily arrayed positions of them on the frame
2
while assembling them with the frame
2
usi
Fleshner & Kim LLP
Freay Charles G.
LG Electronics Inc.
Rodriguez William H.
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