Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
1998-06-05
2001-03-27
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
Reexamination Certificate
active
06206135
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction noise muffler for a hermetic compressor, and particularly to an improved suction noise muffler for a hermetic compressor which is capable of enabling a smooth flow of a refrigerant gas and reducing a suction noise by forming a predetermined shaped guide path for a refrigerant gas flow and a plurality of noise reducing sections.
2. Description of the Conventional Art
Referring to
FIGS. 1 through 3
, a conventional hermetic compressor will now be explained. A housing
1
includes a motor unit
4
having a stator
2
and a rotor
3
, with the stator
2
and the rotor
3
being arranged in a lower portion inside the housing
1
. A crank shaft
5
is inserted into the center portion of the rotor
3
of the motor unit
4
.
An eccentric portion
6
is formed in an upper portion of the crank shaft S. A piston
8
is inserted within a cylinder
7
arranged in an upper portion inside the housing
1
, with the piston
8
reciprocating within the cylinder
7
in cooperation with the rotation of the eccentric portion
6
of the crank shaft
5
.
A valve plate
9
is arranged in a portion of the cylinder
7
for controlling the flow of the refrigerant gas. A suction noise muffler
10
and a discharge noise muffler (not shown) are arranged in the valve plate
9
.
A cylinder head cover
11
is disposed in an upper portion of the suction noise muffler
10
and the discharge noise muffler (not shown).
An elongated wall
14
is arranged inside the suction noise muffler
10
. A first noise reducing section
12
and a second noise reducing section
13
are defined by the elongated wall
14
. An inlet
15
is formed in a portion of the suction noise muffler
10
, through which inlet
15
the refrigerant gas is introduced.
An insertion hole
16
is formed in a predetermined portion of the elongated wall
14
, into which hole
16
a guide tube
17
is inserted for guiding the flow of the refrigerant gas.
An outlet
19
is formed opposite the inlet
15
of the suction noise muffler
10
in order for the refrigerant gas to be guided to a suction hole
18
of the valve plate
9
.
The operation of the conventional hermetic compressor will now be explained with reference to
FIGS. 1 through 3
.
First, when current voltage is supplied to the motor unit
4
, the rotor
3
rotates, and the crank shaft
5
drivingly inserted into the rotor
3
is rotated thereby. The eccentric portion
6
of the crank shaft
5
causes the piston
8
to horizontally reciprocate within the cylinder
7
.
The suction force which is generated in accordance with the horizontally reciprocating movement of the piston
8
serves to introduce the refrigerant gas into the cylinder
7
through the suction noise muffler
10
.
The above-described process will now be explained in more detail.
The refrigerant gas is introduced into the system through the inlet
15
of the suction noise muffler
10
. The noise contained in the introduced refrigerant gas is reduced by the first noise reducing section
12
, and is guided to the second noise reducing section
13
through the guide tube
17
, and the noise is further reduced by the second noise reducing section
13
. Thereafter, the refrigerant gas is discharged through the outlet
19
and is introduced into the cylinder
7
through the suction hole
18
of the valve plate
9
.
The refrigerant gas introduced into the cylinder
7
is compressed and discharged by the reciprocating movement of the piston
8
.
However, since the suction noise muffler
10
is fabricated by a ultrasonic melting method after the guide tube
17
is inserted into the insertion hole
16
, the productivity is decreased due to the complicated fabrication process.
In addition, since the refrigerant gas is not smoothly flown in the system due to a burr which is formed during the ultrasonic melting process, the performance of the suction noise muffler
10
is degraded.
FIGS. 4 and 5
illustrate another conventional hermetic compressor which was disclosed in the U.S. Pat. No. 5,304,044. As shown therein, a motor unit
21
is arranged in an upper portion inside a housing
20
, with the motor unit
21
including a rotor (not shown) and a stator (not shown) for driving a crank shaft (not shown). A cylinder
22
and a piston
23
are arranged in a lower portion inside the housing
20
.
On side of a valve plate
24
is attached to one side of the cylinder
22
. Another side of the valve plate
24
is attached to a cylinder head cover
25
in cooperation with a predetermined engaging member (not shown).
The suction noise muffler
26
includes a cover
27
, an upper casing
28
, and a lower casing
29
. The cover
27
is engaged to the upper portion of the upper casing
28
engaged to the upper portion of the lower casing
29
.
A cylindrical first chamber
30
is vertically formed in the lower casing
29
, and a connection duct
31
is formed within the lower casing
29
and beside the first chamber
30
.
In the upper casing
28
, a second chamber
32
is formed above the first chamber
30
. A hole
33
is formed in a wall formed between the first chamber
30
and the second chamber
32
in order for the refrigerant gas to communicate between the first chamber
30
and the second chamber
32
. A third chamber
34
is formed beside the second chamber
32
and within the upper casing
28
, with the third chamber
34
communicating with the second chamber
32
.
A first insertion hole
36
is formed in a lower portion of the connection duct
31
of the lower casing
29
, with a capillary tube
35
being inserted into the first insertion hole
36
. A discharge hole
37
is formed in a lower portion of the connection duct
31
in order for the refrigerant gas to be discharged through the discharge hole
37
.
An insertion groove
38
is formed above the cylinder head cover
25
in order for the connection duct
31
of the suction noise muffler
26
to be tightly attached to the insertion groove
38
.
A small suction room
39
is formed in a lower portion of the insertion groove
38
in order for a predetermined amount of the refrigerant gas discharged from the discharge hole
37
to be gathered therein.
A discharge room
40
having a larger space than that of the suction room
39
is formed in the lower portion of the suction room
39
.
A suction port
41
is formed in the valve plate
24
at a portion lower than the suction room
39
in order for the refrigerant gas introduced into the suction room
39
to be easily introduced into the cylinder
22
.
A clamp
42
shown in
FIG. 4
is disposed above the cylinder head cover
25
for clamping the suction noise muffler
26
and the capillary tube
35
.
The operation of another conventional hermetic compressor will now be explained with reference to
FIGS. 4 and 5
.
First, when the rotor (not shown) of the motor unit
21
rotates, the crank shaft (not shown) drivingly connected with the rotor is rotated, so that the piston
23
reciprocates within the cylinder
22
.
The suction force generated in the cylinder
22
in cooperation with the reciprocating movement of the piston
23
causes the refrigerant gas to be introduced into the suction noise muffler
26
, and the noise contained in the thusly introduced refrigerant gas is gradually reduced through the first chamber
30
, the second chamber
32
, the third chamber
34
, and the connection duct
31
.
Thereafter, the refrigerant gas is introduced into the cylinder
22
through the discharge hole
37
, the suction room
39
, and the suction port
41
, and is compressed by the piston
23
and is moved to the discharge room
40
.
However, since all of the first chamber
30
, the second chamber
32
, the third chamber
34
, and the connection duct
31
causes a resonant effect therein, a noise reducing effect is decreased.
FIGS. 6 through 8
illustrate still another conventional hermetic compressor which was disclosed in the U.S. Pat. No. 5,201,640. As shown therein, a motor unit
46
having a stator
44
and a rotor
45
is disposed in a lower portion i
Kim Tae Min
Lee Sang Min
Dang Khanh
LG Electronics Inc.
Ostrolenk, Faber, Gerb & Soffen, LL
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