Suction muffler for a compressor

Details Suction muffler for a compressor Suction muffler for a compressor

2001-06-15

2003-04-15

Walberg, Teresa (Department: 3742)

Pumps

With muffler acting on pump fluid

C181S229000

Reexamination Certificate

active

06547535

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hermetic type compressor, and more particularly to a suction muffler for a hermetic type compressor having an improved structure to reduce the noise transmitted by the compressor during operation.
2. Description of the Related Art
As shown in
FIG. 1
, a compressor
10
typically used in home appliances, such as refrigerators, includes an outer casing
20
defining a sealed interior space therein, a body
30
received in the outer casing
20
and having a cylinder
50
for compressing a refrigerant, and a suction muffler
40
for reducing noise generated during operation of the compressor.
As shown in
FIG. 2
, the suction muffler
40
includes a muffler body
41
and refrigerant suction pipe
42
. The muffler body
41
is disposed above the cylinder
50
and has a refrigerant supply port
41
b
, which communicates with a refrigerant supply pipe
21
. The refrigerant suction pipe
42
connects the interior of the muffler body
41
with a cylinder head portion
51
.
In the suction muffler
40
constructed as above, refrigerant flows into the compressor
10
via the refrigerant supply pipe
21
, and into a resonance chamber
41
a defined in the muffler body
41
via the refrigerant supply port
41
b
. The refrigerant then flows into the cylinder head portion
51
via the refrigerant suction pipe
42
. The path of the refrigerant from the refrigerant supply pipe
21
to the cylinder head portion
51
is indicated by a solid-line arrow of FIG.
2
. From the cylinder head portion
51
, the refrigerant flows to a cylinder inlet
52
and into an interior of the cylinder
50
, where the refrigerant is compressed to high pressure.
As the refrigerant flows through the inlet
52
and an outlet
53
of the cylinder head portion
51
, valves (not shown) in the cylinder head portion
51
open and close, producing vibration and noise. The noise exits from the cylinder head portion
51
through the muffler body
41
and the refrigerant supply pipe
21
. The path along, which the noise travels, is a reverse of the path of the refrigerant and is indicated by a dotted-line arrow of FIG.
2
.
In order to minimize the level of noise from the muffler
40
, a noise transmission path within the resonance chamber
41
a
should be as long as possible. Accordingly, the refrigerant suction pipe
42
extends from the bottom of the resonance chamber
41
a
to a predetermined height corresponding to an upper portion of the muffler body
41
.
The extended length of the refrigerant suction pipe
42
, however, increases a flow resistance for the refrigerant flowing through the muffler
40
. Accordingly, the compressing efficiency of the compressor
10
is adversely affected. If the refrigerant suction pipe
42
is shortened, however, then the noise transmission path is also shortened, and accordingly, the compressor
10
will transmit a higher level of noise.
Albeit not shown, the muffler
40
may further include a baffle to reduce the level of noise produced by the compressor
10
. Alternatively, the resonance chamber
41
a
of the muffler
40
may have a dual chamber structure. These approaches, however, have several disadvantages, such as complicating the manufacturing process, decreasing productivity, and increasing manufacturing costs.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the related art, and accordingly, it is an object of the present invention to provide a suction muffler for a compressor having a refrigerant suction pipe and a resonance chamber of an improved structure to reduce the level of noise produced by the compressor.
The above object is accomplished by a suction muffler for a compressor according to the present invention, including a muffler body, a refrigerant suction pipe, and a noise reducing means. The muffler body defines a resonance chamber, which communicates with the refrigerant supply pipe of the compressor. The refrigerant suction pipe for connecting the resonance chamber to a cylinder head portion of the compressor. The noise reducing means is formed in the resonance chamber and reduces the noise that is created by the discharge of refrigerant. The noise reducing means accomplishes this by defining a noise transmission path, through which the noise is transmitted from the cylinder head during the refrigerant discharge, that is separate from a refrigerant flow path, through which a refrigerant flows into the cylinder head portion.
The noise reducing means includes a hole formed in a portion of a cylindrical wall of the refrigerant suction pipe. The hole permits a refrigerant to flow therethrough.
The cylindrical wall of the refrigerant suction pipe may also include a pair of holes formed therein, the holes being located opposite one another.
Further, the noise reducing means includes a guiding portion to direct the refrigerant from the refrigerant supply pipe into the hole, and also to block the diffusion of noise and to direct the noise in a particular direction about the resonance chamber.
The guiding portion includes a portion of the muffler body that is indented toward the refrigerant suction pipe.


REFERENCES:
patent: 5435700 (1995-07-01), Park
patent: 5734134 (1998-03-01), Park
patent: 5971720 (1999-10-01), Fagotti et al.
patent: 6206135 (2001-03-01), Kim et al.
patent: 6398523 (2002-06-01), Hur et al.
patent: 2002/0098093 (2002-07-01), Tomell et al.
patent: 411062827 (1999-03-01), None
patent: 02000257556 (2000-09-01), None
patent: 2001054597 (2001-07-01), None

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