U.S. patent application number 09/756240 was filed with the patent office on 2001-09-13 for hermetic compressor.
Invention is credited to Kim, Gui-Gwon.
Application Number | 20010021350 09/756240 |
Document ID | / |
Family ID | 19653730 |
Filed Date | 2001-09-13 |
United States Patent
Application |
20010021350 |
Kind Code |
A1 |
Kim, Gui-Gwon |
September 13, 2001 |
Hermetic compressor
Abstract
A hermetic compressor having a noise absorbing member disposed
in an enclosed casing for noise reduction is provided. The noise
absorbing member substantially in a circular disk shape is attached
to an inner surface of an upper side of the upper shell to reduce
various machine noises generated during an operation mode of the
compressor. The noise absorbing member includes a circular disk, a
hole formed at the center portion of the circular disk, and a
plurality of extending portions radially and outwardly extending
from the circular disk. The noise absorbing member is attached to
the upper shell and simultaneously fitted around a crankshaft
stopper which supports the hole of the noise absorbing member and
adheres onto the upper shell.
Inventors: |
Kim, Gui-Gwon; (Suwon-city,
KR) |
Correspondence
Address: |
ROBERT E. BUSHNELL
1522 K STREET NW
SUITE 300
WASHINGTON
DC
200051202
|
Family ID: |
19653730 |
Appl. No.: |
09/756240 |
Filed: |
January 9, 2001 |
Current U.S.
Class: |
417/363 |
Current CPC
Class: |
F04B 39/121 20130101;
F04B 39/0027 20130101 |
Class at
Publication: |
417/363 |
International
Class: |
F04B 017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 9, 2000 |
KR |
11872/2000 |
Claims
What is claimed is:
1. A hermetic compressor, comprising: an enclosed casing formed of
upper and lower shells, having an electronic device section and a
compression device section disposed in said enclosed casing to
compress refrigerant supplied into said compression device section
and discharging the compressed refrigerant out of said enclosed
casing; and a noise absorbing member substantially in a shape of a
circular disk disposed at an inner surface of an upper side of said
upper shell for reducing noise generated during said operation of
the compressor.
2. The hermetic compressor of claim 1, said noise absorbing member
including a hole formed at a center portion of said circular
disk.
3. The hermetic compressor of claim 2, further comprising a
crankshaft stopper having a shape of a hollow cylinder, having one
end adhering onto said inner surface of said upper side of said
upper shell.
4. The hermetic compressor of claim 3, said hole of said noise
absorbing member fitted around said crankshaft stopper while
adhering onto said inner surface of said upper side.
5. The hermetic compressor of claim 3, further comprising: said
crankshaft stopper having an open end opposite to said one end; and
said electronic device section having a crankshaft transmitting a
driving force from said electronic device section to said
compression device section, one end of said crankshaft inserted
inside said crankshaft stopper through said open end of said
crankshaft stopper.
6. The hermetic compressor of claim 2, said noise absorbing member
including a plurality of extension portions radially extending from
said circular disk.
7. The hermetic compressor of claim 6, said extension portions
spared apart from each other at a predetermined interval.
8. The hermetic compressor of claim 6, said extension portions
having a predetermined thickness.
9. The hermetic compressor of claim 8, when said thickness varies
along a radial direction.
10. A hermetic compressor, comprising: an enclosed casing formed of
upper casing and lower shells, having an electronic device section
generating a driving force, a compression device section
compressing refrigerant supplied into said compression device
section through said enclosed casing and discharging the
refrigerant out of said enclosed casing in dependence upon said
driving force during an operation mode, and a crankshaft coupling
said electronic device to said compression device; and a noise
absorbing member in a shape of a circular disk disposed on an inner
surface of an upper side of said upper shell for reducing noise
generated during said operation mode.
11. The hermetic compressor of claim 10, said noise absorbing
member having a hole formed at a center portion of said circular
disk.
12. The hermetic compressor of claim 10, said noise absorbing
member having a plurality of extension portions radially extending
from said circular disk.
13. The hermetic compressor claim 12, said extension portions
spaced apart from each other at a predetermined interval.
14. The hermetic compressor of claim 12 said extension portions
having a predetermined thickness.
15. The hermetic compressor of claim 12 said extension portions
having a thickness varying along a radial direction.
16. The hermetic compressor of claim 10, further comprising: a
crankshaft cylinder, having one end adhering onto said inner
surface of said upper side, having an open end opposite to said one
end; and one end of said crankshaft inserted into said crankshaft
stopper through said open end of said crankshaft stopper.
17. The hermetic compressor of claim 16, said noise absorbing
member having a hole formed at a center portion of said circular
disk, said hole fitted around said hollow cylinder of said
crankshaft stopper.
Description
CLAIM OF PRIORITY
[0001] This application makes reference to, incorporates the same
herein, and claims all benefits accruing under 35 U.S.C. .sctn. 119
from an application for SEALED COMPRESSOR earlier filed in the
Korean Industrial Property Office on the Mar. 19, 2000 and there
duly assigned Serial No. 11872/2000.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a compressor, and more
particularly, to a hermetic compressor having a vibration absorbing
member adhering onto an upper shell of the hermetic compressor for
damping vibration-induced noise and machine noise generated during
an operation of the compressor.
[0004] 2. Description of the Prior Art
[0005] Generally, a compressor, such as a hermetic compressor,
employed in a refrigerator, air conditioner, etc. includes an
enclosed casing formed by upper and lower shells, and an electronic
device section and a compression device section disposed within the
enclosed casing to perform respective operations corresponding to
each other. When electricity is applied to the electronic device
section, a crankshaft press-fitted in a rotor of the electronic
device section is rotated, and the rotary motion of the crankshaft
is transformed into the reciprocal linear motion of a piston
through a connecting rod which connects the crankshaft and the
piston of the compression device section. Accordingly, while the
piston reciprocally moves within a cylinder of the compression
device section, refrigrant is compressed and discharged. During the
operation of the compressor, vibration7 induced noise, i.e.,
various machine noises occur. This noise includes noise from a
high-speed refrigerant flow, noise generated due to the friction
between the cylinder and the piston, and noise generated due to
percussion occurring during opening/closing of a valve of the
compression device section. In the general compressor, a suction
muffler and a discharge muffler are employed to reduce the noise
from the fluid flow, while a noise absorbing structure is employed
to reduce various machine noises.
[0006] The noise absorbing structure for reducing the machine noise
is constructed in such a manner that the compression device section
itself or a frame supporting the compression device section thereon
is supported on a bottom of the enclosed casing by a spring to damp
and counteract the vibration of the compression device section,
thus to prevent transmission of vibration of the compression device
section to the enclosed casing. Such a noise absorbing structure,
however, is not sufficient to reduce the noise.
[0007] The Korean Patent Publication No. 1998-0037772 discloses a
casing for a hermetic compressor having a noise absorbing band. The
Korean Patent Publication No. 1998-0037772 includes an annular
horizontal noise absorbing band and a vertical noise absorbing band
of a certain width and adapted onto horizontal and vertical planes.
The Korean Patent Publication No. 1998-0037772 shows the increased
stiffness and the variance of a spring constant of the enclosing
casing. By the conventional noise reducing structure described in
the above references, however, since the annular horizontal and
vertical noise absorbing bands have to be adapted along an inner
surface of the enclosed casing by a proper joining method such as
welding, etc., an assembling process becomes complicated, and the
assembling time is lengthened. Accordingly, the productivity of the
compressor is lowered.
SUMMARY OF THE INVENTION
[0008] It is an object of the present invention to provide a
hermetic compressor able to reduce noise generated during an
operation of the hermetic compressor.
[0009] It is another object to provide a hermetic compressor able
to reduce noise in a certain frequency range.
[0010] It is yet another object to provide a hermetic compressor
able to change a characteristic frequency of vibration of the
hermetic compressor.
[0011] It is still another object to provide a hermetic compressor
able to increase the stiffness of a casing of the hermetic
compressor.
[0012] It is a further object to provide a hermetic compressor able
to reduce an assembling time when a noise absorbing member is
assembled into a casing of the hermetic compressor.
[0013] These and other objects may be achieved by providing a
hermetic compressor having an enclosed casing formed of upper and
lower shells, an electronic device section and a compression device
section disposed in the enclosed casing for compressing
refrigerant, the electronic device section generating a driving
force, the compression device section being linearly moved by the a
driving force transmitted from the electronic device section, a
noise absorbing member substantially in the shape of a circular
disk shape disposed at an inner surface of an upper side of the
upper shell for reducing machine noise generated during the
operation of the compressor.
[0014] The noise absorbing member includes a hole formed at a
center portion and a plurality of extending portions radially
extending from the hole. The noise absorbing member adheres onto
the inner surface of the upper shell and simultaneously contacts a
crankshaft stopper which supports the hole of the noise absorbing
member and is disposed within the hole and attached onto the a
control portion of the upper shell.
[0015] By inserting the hole of the noise absorbing member around
the crankshaft stopper, the noise absorbing member can be easily
disposed in the enclosed casing while the crankshaft stopper
adheres onto the upper shell. Without a further separate process,
such as a separate welding or the like the noise absorbing member
is attached to the upper shell and around the crankshaft stopper.
Since the assembling time is greatly reduced, the productivity of
the compressor is also greatly improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] A more complete appreciation of the invention, and many of
the attendant advantages thereof, will be readily apparent as the
same becomes better understood by reference to the following
detailed description when considered in conjunction with the
accompanying drawings in which like reference symbols indicate the
same or similar components, wherein:
[0017] FIG. 1 is a cross-sectional view schematically showing the
structure of a hermetic compressor according to the principle of
the present invention;
[0018] FIG. 2 is a bottom perspective view of an upper shell into
which a noise absorbing member is employed;
[0019] FIG. 3 is an exploded perspective view for showing the noise
absorbing member, a crankshaft stopper, and the upper shell;
[0020] FIGS. 4A and 4B are graphs showing the comparison of the
respective frequency amplitudes detected from the upper shell of
the prior art and of the present invention into which the noise
absorbing member is employed; and
[0021] FIG. 5 is a graph for showing the comparison of the noise
degree generated from the prior art compressor and from the
compressor according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0022] Referring to FIG. 1, a hermetic compressor according to the
principle of the present invention includes an enclosed casing 10,
an electronic device section 20, a compression device section 30,
and a noise absorbing member 40.
[0023] Enclosed casing 10 includes a semi-sphere upper and lower
shells 11 and 12 which define an enclosed space therebetween by
being joined with each other. Electronic device section 20 is
disposed within upper shell 11 of the enclosed casing 10 and
includes a stator 21, a rotor 22 and a crankshaft 23 press-fitted
into rotor 22. Compression device section 30 is disposed within
lower shell 12 of enclosed casing 10 and includes a cylinder 31, a
piston 32 reciprocally movable within cylinder 31, and a connecting
rod 33 disposed between piston 32 and crankshaft 23 to transform
the rotary motion of crankshaft 23 into the reciprocal linear
motion of piston 32. Noise absorbing member 40 reduces
vibration-induced noise, i.e. various machine noises which are
generated during the operation of the compressor. As shown in FIG.
2, noise absorbing member 40 adheres onto an inner surface 11B of a
top portion 11A of upper shell 11. Noise absorbing member 40 is
substantially in a circular disk shape and includes a hole 41
formed at a center of a circular portion 43, and a plurality of
extending portions 42 which are formed on the outer circumference
of the noise absorbing member 40 by radially and outwardly
extending from circular portion 43 at an equal spacing a. A
thickness b of each extending portion 42 may be constant or varies.
The shape of noise absorbing member 40 having circular portion 43
and extending portions 42 contributes to change stiffness and
spring constant of upper shell 11.
[0024] Noise absorbing member 40 tightly adheres onto inner surface
11B of upper shell 11, as the crankshaft stopper 50 supported by
hole 41 formed at the center of noise absorbing member 40 adheres
onto upper shell 11. Here, crankshaft stopper 50 adheres onto the
upper shell 11 by spot welding. That is, while adhering onto
crankshaft stopper 50, noise absorbing member 40 simultaneously
adheres onto upper shell 11 by the welding and accordingly does not
require a further separate process for attaching noise absorbing
member 40 to upper shell 11.
[0025] In the hermetic compressor constructed as above according to
the principle of the present invention, when electricity is applied
to electronic device section 20, rotor 22 is rotates, and
simultaneously, crankshaft 23 coupled to rotor 22 rotates. The
rotary movement of crankshaft 23 is transformed into the linear
motion of piston 32 through connecting rod 33, and accordingly, the
piston 32 suctions, compresses, and discharges the refrigerant
while performing reciprocal linear movement in cylinder 31.
[0026] At this time, as in the conventional case, the noise from
the high-speed fluid flow and the machine noise due to vibration of
various components are generated. Here, the noise from the fluid
flow may be reduced by suction and discharge mufflers 60 and 70
while the vibration causing the machine noise is firstly damped and
counteracted by a noise absorbing structure 80 and then is
transmitted to enclosed casing 10. Accordingly, while the machine
noise may be reduced in a certain degree, there exists vibration of
a large amplitude within a certain frequency range generated at
enclosed casing 10. The vibration from enclosed casing 10, however,
is secondly reduced by noise absorbing member 40 which adheres to
upper shell 11 according to the present invention. More
specifically, with noise absorbing member 40 adhering onto a center
portion of inner surface 11B of upper shell 11, the stiffness of
enclose casing 10 increases, and spring constant of enclose casing
10 varies. Accordingly, the characteristic frequency range of
enclosed casing 10 is changed from the resonance frequency into a
certain frequency range with the reduced vibration and reduced
amplitude, thereby significantly reducing the noise caused by the
vibration.
[0027] The characteristic frequency of vibration was analyzed at
the upper shell 11 onto which noise absorbing member 40 adheres. As
shown in FIGS. 4A and 4B, the results show a significant difference
between the present invention and the prior art. That is, FIG. 4A
shows the noise degree detected from upper shell 11 of the
conventional compressor without the noise absorbing member, and
FIG. 4B shows the noise degree detected from upper shell 11 of the
compressor onto which the noise absorbing member 40 adheres
according to the present invention. As shown in FIGS. 4A and 14B,
there are large differences of the characteristic frequency of
vibrations between both compressors in a certain frequency range.
According to the present invention, due to the significant
amplitude reduction of vibration in the certain frequency range by
the change of the characteristic frequency of vibration of upper
shell 11, the noise by the vibration can be reduced.
[0028] FIG. 5 shows the experiment result, in which a dotted line
indicating the noise degree detected from the hermetic compressor
according to the present invention is mostly lower than a solid
line indicating the noise degree detected from the conventional
hermetic compressor. In the certain frequency range, in particular,
i.e., in the frequency range of 80-800 Hz, the amplitude is reduced
and the operation of the refrigerator or the air conditioner having
a compressor can be performed with very low noise.
[0029] As described above, in the hermetic compressor according to
the present invention, the noise absorbing member substantially in
a circular disk shape adheres more easily onto upper shell 11 for
reducing various machine noises generated during the operation of
the compressor. Further, since the noise absorbing member can be
simply adhered onto the upper shell 11 simultaneously when adhering
the crankshaft stopper of the compressor to the upper shell 11, the
noise absorbing member adhering time can be significantly reduced,
and accordingly, the productivity of the compressor increases.
[0030] As stated above, a preferred embodiment of the present
invention is shown and described. Although the preferred embodiment
of the present invention has been described, it is understood that
the present invention should not be limited to this preferred
embodiment but various changes and modifications can be made by one
skilled in the art within the spirit and scope of the present
invention as hereinafter claimed.
* * * * *