U.S. patent application number 10/831283 was filed with the patent office on 2005-03-10 for compressor.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Kim, Chul, Kim, Jong Hyuk, Park, Seong Own, Song, Ki Wook, Yang, Yong Jin.
Application Number | 20050053479 10/831283 |
Document ID | / |
Family ID | 34228057 |
Filed Date | 2005-03-10 |
United States Patent
Application |
20050053479 |
Kind Code |
A1 |
Song, Ki Wook ; et
al. |
March 10, 2005 |
Compressor
Abstract
Compressor including a hermetic container forming an outside
appearance, and having an inside space, a compression part inside
of the hermetic container, for drawing, compressing, and
discharging a refrigerant, a driving part for driving the
compression part, two pipes on an outside wall of the hermetic
compressor in communication with an inside of the hermetic
container, having functions exchangeable with each other according
to design conditions of a heat exchange cycle, and a suction
muffler inside of the hermetic container for discharging the
refrigerant toward the compressor, and attenuating noise of
refrigerant drawn from a pipe which functions as a suction pipe
that guides the refrigerant to an inside of the hermetic container
of the two pipes, thereby permitting easy change of functions of
the pipes in the hermetic container.
Inventors: |
Song, Ki Wook; (Busan-si,
KR) ; Yang, Yong Jin; (Changwon-si, KR) ; Kim,
Jong Hyuk; (Changwon-si, KR) ; Park, Seong Own;
(Changwon-si, KR) ; Kim, Chul; (Changwon-si,
KR) |
Correspondence
Address: |
FLESHNER & KIM, LLP
P.O. BOX 221200
CHANTILLY
VA
20153
US
|
Assignee: |
LG Electronics Inc.
|
Family ID: |
34228057 |
Appl. No.: |
10/831283 |
Filed: |
April 26, 2004 |
Current U.S.
Class: |
417/312 |
Current CPC
Class: |
F04B 39/0055
20130101 |
Class at
Publication: |
417/312 |
International
Class: |
F04B 039/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 13, 2003 |
KR |
P2003-0056200 |
Sep 9, 2003 |
KR |
P2003-0062946 |
Claims
What is claimed is:
1. A compressor comprising: a hermetic container forming an outside
appearance, and having an inside space; a compression part inside
of the hermetic container, for drawing, compressing, and
discharging a refrigerant; a driving part for driving the
compression part; two pipes on an outside wall of the hermetic
compressor in communication with an inside of the hermetic
container, having functions exchangeable with each other according
to design conditions of a heat exchange cycle; and a suction
muffler inside of the hermetic container for discharging the
refrigerant toward the compressor, and attenuating noise of
refrigerant drawn from a pipe which functions as a suction pipe
that guides the refrigerant to an inside of the hermetic container
of the two pipes.
2. The compressor as claimed in claim 1, wherein the suction
muffler has a suction hole opposite to a pipe that functions as the
suction pipe.
3. The compressor as claimed in claim 2, wherein the two pipes are
fitted between a front and opposite sides of the hermetic
container, respectively, and the suction muffler is mounted on a
front part of an inside of the hermetic container between the two
pipes.
4. The compressor as claimed in claim 1, further comprising a third
pipe in communication with an inside of the hermetic
compressor.
5. The compressor as claimed in claim 4, wherein, among the three
pipes, one of two pipes excluding a pipe opposite to the suction
hole of the suction muffler is used as a discharge pipe for guiding
compressed refrigerant to an outside of the hermetic container.
6. The compressor as claimed in claim 1, wherein the hermetic
container includes a terminal fitting part for fitting a power
supply device thereto for supplying power to an inside of the
hermetic container.
7. The compressor as claimed in claim 6, wherein the power supply
device is fitted to an inside wall of the hermetic container having
the terminal fitting part formed thereon.
8. The compressor as claimed in claim 7, wherein the terminal
fitting part is formed at a position having a largest space between
the inside wall of the hermetic container and components held in an
inside space.
9. The compressor as claimed in claim 3, wherein the hermetic
container includes a terminal fitting part formed to fit the power
supply device for supplying power to an inside of the hermetic
container.
10. The compressor as claimed in claim 9, wherein the power supply
device is fitted to an inside wall of the hermetic container having
the terminal fitting part formed thereon.
11. The compressor as claimed in claim 10, wherein the terminal
fitting part is formed one of opposite sides of the hermetic
container.
12. The compressor as claimed in claim 1, wherein the hermetic
container includes; a lower case, and an upper case joined to a top
of the lower case.
13. The compressor as claimed in claim 12, wherein the upper case
has a curved surface.
14. The compressor as claimed in claim 13, wherein the upper case
has a curved surface sloped downwardly from one side to the other
side such that the one side is higher than the other side.
15. The compressor as claimed in claim 1, wherein the hermetic
container includes recesses each recessed into an inside of a
surface of the case.
16. The compressor as claimed in claim 15, wherein the recesses are
provided in an upper part of the hermetic container as at least one
stopper for restricting shaking of an inside components within a
predetermined range.
17. The compressor as claimed in claim 16, wherein the stoppers are
formed along a periphery of an upper surface of the hermetic
container at two or more than places.
18. The compressor as claimed in claim 17, wherein the stoppers are
formed at opposite sides of a vibration direction of the inside
component.
Description
[0001] This application claims the benefit of the Korean
Application Nos. P2003-056200, and P2003-062946, both filed on Aug.
13, 2003, which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to compressors for compressing
a working fluid such as refrigerant to a required pressure, and
more particularly, to a compressor having pipes of which functions
are interchangeable with easy.
[0004] 2. Background of the Related Art
[0005] In general, in the compressor, for compressing the working
fluid, such as gas or refrigerant, to a required pressure, and
discharging a compressed working fluid, there are turbo type
compressors, such as the axial compressors, and the centrifugal
compressors, and displacement type compressors, such as the
rotating type compressors, and the reciprocating type
compressors.
[0006] Of the compressors, the reciprocating type compressor
compresses gas or refrigerant drawn into a cylinder by
reciprocating movement of a piston in the cylinder. A related art
reciprocating compressor (hereafter called as a compressor) is
provided with a hermetic container having an upper container, and a
lower container, a compression part in the hermetic container for
compressing the refrigerant, and a driving part for driving the
compression part.
[0007] The compression part is provided with a compression chamber
for drawing, and compressing and discharging the refrigerant, and a
suction muffler for attenuating noise of refrigerant being drawn
into the compression chamber, and the hermetic container has a
suction pipe for guiding the refrigerant from an outside of the
hermetic compressor to the suction muffler, a discharge pipe for
guiding the refrigerant from the compression chamber to an outside
of the hermetic container, a process pipe for supplying oil and the
like into the compressor, and a terminal fitting part for fitting a
power supply device.
[0008] However, in general, if it is intended to interchange
functions of the pipes according to design conditions of the heat
exchanger cycle, since the interchange is impossible, development
of a compressor having interchangeable functions is required.
[0009] The related art compressor has a space for the terminal
fitting part, such that connection of a terminal of the power
supplying device provided on an inside wall of the hermetic
container is difficult.
[0010] The hermetic container fabricated of a flat panel, that
forms an outside shape of the compressor, and holds various
components of the compressor therein, is weak such that the
hermetic container can not protect the various components from an
external impact adequately.
SUMMARY OF THE INVENTION
[0011] Accordingly, the present invention is directed to a
compressor that substantially obviates one or more of the problems
due to limitations and disadvantages of the related art.
[0012] An object of the present invention is to provide a
compressor which enables easy change of functions of pipes on a
hermetic container.
[0013] Other object of the present invention is to provide a
compressor which enables easy fitting of components of the
compressor.
[0014] Another object of the present invention is to provide a
compressor a strength of a hermetic container of which is
reinforced, for holding components of the compressor.
[0015] Additional features and advantages of the invention will be
set forth in the description which follows, and in part will be
apparent to those having ordinary skill in the art upon examination
of the following or may be learned from practice of the invention.
The objectives and other advantages of the invention will be
realized and attained by the structure particularly pointed out in
the written description and claims hereof as well as the appended
drawings.
[0016] To achieve these objects and other advantages and in
accordance with the purpose of the present invention, as embodied
and broadly described herein, the compressor includes a hermetic
container forming an outside appearance, and having an inside
space, a compression part inside of the hermetic container, for
drawing, compressing, and discharging a refrigerant, a driving part
for driving the compression part, two pipes on an outside wall of
the hermetic compressor in communication with an inside of the
hermetic container, having functions exchangeable with each other
according to design conditions of a heat exchange cycle, and a
suction muffler inside of the hermetic container for discharging
the refrigerant toward the compressor, and attenuating noise of
refrigerant drawn from a pipe which functions as a suction pipe
that guides the refrigerant to an inside of the hermetic container
of the two pipes.
[0017] The suction muffler has a suction hole opposite to a pipe
that functions as the suction pipe.
[0018] The two pipes are fitted between a front and opposite sides
of the hermetic container, respectively, and the suction muffler is
mounted on a front part of an inside of the hermetic container
between the two pipes.
[0019] The compressor further includes a third pipe in
communication with an inside of the hermetic compressor.
[0020] Among the three pipes, one of two pipes excluding a pipe
opposite to the suction hole of the suction muffler is used as a
discharge pipe for guiding compressed refrigerant to an outside of
the hermetic container.
[0021] The hermetic container includes a terminal fitting part for
fitting a power supply device thereto for supplying power to an
inside of the hermetic container.
[0022] The power supply device is fitted to an inside wall of the
hermetic container having the terminal fitting part formed
thereon.
[0023] The terminal fitting part is formed at a position having a
largest space between the inside wall of the hermetic container and
components held in an inside space.
[0024] The hermetic container includes a terminal fitting part
formed to fit the power supply device for supplying power to an
inside of the hermetic container.
[0025] The power supply device is fitted to an inside wall of the
hermetic container having the terminal fitting part formed
thereon.
[0026] The terminal fitting part is formed one of opposite sides of
the hermetic container.
[0027] The hermetic container includes a lower case, and an upper
case joined to a top of the lower case.
[0028] The upper case has a curved surface, and it is preferable
that the upper case has a curved surface sloped downwardly from one
side to the other side such that the one side is higher than the
other side.
[0029] The hermetic container includes recesses each recessed into
an inside of a surface of the case.
[0030] The recesses are provided in an upper part of the hermetic
container as at least one stopper for restricting shaking of an
inside components within a predetermined range.
[0031] The stoppers are formed along a periphery of an upper
surface of the hermetic container at two or more than places, and
preferably at opposite sides of a vibration direction of the inside
component.
[0032] It is to be understood that both the foregoing description
and the following detailed description of the present invention are
exemplary and explanatory and are intended to provide further
explanation of the invention claimed.
BRIEF DESCRITPION OF THE DRAWINGS
[0033] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this application, illustrate embodiment(s) of
the invention and together with the description function to explain
the principle of the invention.
[0034] In the drawings;
[0035] FIG. 1 illustrates a plan view of a compressor in accordance
with a preferred embodiment of the present invention having an
upper case removed therefrom;
[0036] FIG. 2 illustrates a front view showing a suction muffler in
FIG. 1;
[0037] FIG. 3 illustrates a plan view of a compressor in accordance
with a preferred embodiment of the present invention having an
upper case removed therefrom, showing a state in which functions of
pipe are exchanged;
[0038] FIG. 4 illustrates a front view of a suction muffler
provided to FIG. 3;
[0039] FIG. 5 illustrates a side view of an embodiment of an upper
case provided to a compressor of the present invention;
[0040] FIG. 6 illustrates a plan view of the upper case in FIG. 5;
and
[0041] FIG. 7 illustrates a graph showing a natural frequency of a
compressor having a hermetic container with the upper case in FIG.
5 provided thereto.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0042] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings. In describing the
embodiments of the present invention, same parts will be given the
same names and reference symbols, and repetitive description of
which will be omitted.
[0043] FIG. 1 illustrates a plan view of a compressor in accordance
with a preferred embodiment of the present invention having an
upper case removed therefrom, FIG. 2 illustrates a front view
showing a suction muffler in FIG. 1, FIG. 3 illustrates a plan view
of a compressor in accordance with a preferred embodiment of the
present invention having an upper case removed therefrom, showing a
state in which functions of pipe are exchanged, and FIG. 4
illustrates a front view of a suction muffler provided to FIG.
3.
[0044] Referring to FIGS. 1 to 4, the compressor includes a
hermetic container having a lower case 30 and an upper case (not
shown) which forms an outside appearance, and various components
held inside of the hermetic container.
[0045] There are mounting plates 32 on an underside of the lower
case 30 for fastening the compressor. The lower case 30 has a
terminal fitting part 33 at one side of the lower case 30,
particularly, at a left side of the lower case 30 in FIG. 2, for
supplying power to the compressor.
[0046] There is an inside connector 33a on an inside wall of the
lower case 30 opposite to the terminal fitting part 33. A cable is
connected to the inside connector 33a for supplying power to an
inside of the compressor. In the embodiment, though the terminal
fitting part 33 is fitted to a left outside wall of the lower case
30, the terminal fitting part 33 may be fitted to a right outside
wall of the lower case 30.
[0047] For making inside and outside of the hermetic container in
communication, there are at least two pipes 34, and 36 passed
through the lower case 30. One of pipes 34, and 36 is called as a
first pipe 34, and the other pipe is called as a second pipe
36.
[0048] The first pipe 34 and the second pipe 36 are configured to
enable exchange of functions according to design conditions of heat
exchange cycle, i.e., positions of an evaporator and a condenser,
and one of which functions as a suction pipe for guiding
refrigerant into an inside of the hermetic container.
[0049] It is preferable that the hermetic container includes a
third pipe 38 in addition to the first pipe 34 and the second pipe
36. Because, basically, in addition to a suction pipe for guiding
the refrigerant into the hermetic container, and a discharge pipe
for guiding compressed refrigerant to an outside of the hermetic
container, it is preferable that the compressor has a process pipe
for filling oil into the compressor.
[0050] In more detail, one of the two pipes excluding the pipe
functioning as the suction pipe functions as a discharge pipe, and
the other pipe functions as the process pipe.
[0051] If it is assumed that a part the terminal fitting part 33 is
provided thereto is a side of the lower case 30, the first pipe 34
and the second pipe 34 pass a part between front and opposite sides
of the lower case 30. The third pipe 38 passes an opposite side of
a side the terminal fitting part 33 is provided thereto.
[0052] In the embodiment, one of the first pipe 34 and the second
pipe 36 functions as the suction pipe according to design
conditions of the heat exchange cycle, and the other one functions
as the process pipe. That is, if the first pipe is used as a
suction pipe, the second pipe is used as the process pipe, and vice
versa. The third pipe 38 performs a function of the discharge
pipe.
[0053] There is a frame 40 inside of the lower case 30 for fitting
various components of a compression part for drawing, compressing,
and discharge refrigerant, and a driving part for driving the
compression part.
[0054] The driving part includes a motor part having a stator 42
fixed to an underside of the frame 40, and a rotor 43 provided
inside of the stator 42. There is a crankshaft 45 press fit at a
center of the rotor 43 passed through the frame 40, for rotating by
electromagnetic action between the rotor 43 and the stator 42,
together with the rotor 43.
[0055] There is a crank pin 46 on the crankshaft 45 eccentric from
a rotation axis of the crankshaft 45. The crank pin 46 has other
end connected to a connecting rod 48 having one end connected to a
piston 50. The connecting rod 48 converts rotation of the
crankshaft 45 into a linear reciprocating movement of the piston
50.
[0056] The piston 50 is inside of a cylinder 52 fixed to one side
of top of the frame 40, forms a compression chamber for compressing
the refrigerant, and functions for compressing the refrigerant.
That is, the piston 50 reciprocates inside of the cylinder
linearly, to compress the refrigerant.
[0057] There is a valve assembly 54 at one side of the compression
chamber of the cylinder 52. The valve assembly 54 has head cover 58
fabricated as one unit therewith, for isolating the refrigerant
being drawn into the compression chamber from the refrigerant being
discharged from the compression chamber.
[0058] The valve assembly 54 having the head cover 58 fabricated as
one unit therewith isolates the refrigerant being drawn into the
compression chamber from the refrigerant being discharged from the
compression chamber.
[0059] In the meantime, there is a suction muffler 60 at one side
the head cover 58. The suction muffler 60, provided for attenuating
noise of the refrigerant drawn into the compression chamber from an
outside of the hermetic container, has a suction hole 62 for
receiving the refrigerant from an outside of the suction muffler
60.
[0060] In more detail, the suction muffler 60 has a suction hole 62
projected outwardly from one side, and a discharge hole 63 at a top
thereof connected to the head cover 58 for discharging the
refrigerant toward the compression chamber.
[0061] In the embodiment, the suction hole 62 of the suction
muffler is connected to a pipe functioning as the suction pipe of
the first pipe 34 and the second pipe 36 provided to the hermetic
container. That is, in the compressor shown in FIG. 1, the first
pipe is connected to the suction hole of the suction muffler, such
that the first pipe functions as the suction pipe, and in the
compressor shown in FIG. 3, the second pipe is connected to the
suction hole of the suction muffler, such that the second pipe
functions as the suction pipe.
[0062] For this, the suction muffler 60 is mounted inside of the
lower case 30, particularly, opposite to a position between the
first pipe 34 and the second pipe. Since the suction muffler 60 is
mounted close to the cylinder 52, the cylinder 52 is also mounted
inside of the lower case between the first pipe 34 and the second
pipe.
[0063] For using the first pipe 34 or the second pipe 36 as the
suction pipe 36 according to design conditions of the heat exchange
cycle, the suction muffler 60 has a suction hole 62 at a left side
or right side when the drawing is seen from above. Of course, the
suction muffler 60 may exchange functions of the pipes by changing
connection between the suction hole and the pipes by using flexible
connection pipes (not shown) provided separately without changing a
position of the suction hole.
[0064] In more detail, referring to FIG. 1, in a case it is
required that the first pipe is used as the suction pipe according
to design conditions of the heat exchange cycle, the suction hole
62a of the suction muffler is extended to a left as shown in FIG.
2, to opposite to an inside end of the first pipe. As shown in FIG.
3, in a case it is required that second pipe is used as the suction
pipe according to design conditions of the heat exchange cycle, as
shown in FIG. 4, the suction hole 62b of the suction muffler is
extended to a right, to opposite to an inside end of the second
pipe.
[0065] Next, there is a discharge muffler 65 at the other side of
the head cover 58 for attenuating noise of the discharged
refrigerant. That is, the discharge muffler 65 serves to remove
noise and pulsation of the working fluid compressed at the
compression chamber. The discharge muffler 65 is made to be in
communication with a pipe that serves as a discharge pipe by a loop
pipe 67. In the embodiment, the discharge muffler is in
communication with the third pipe 38.
[0066] The loop pipe 67 connected between the discharge muffler 65
and the third pipe 38 is fabricated by bending a length of pipe
many times, for attenuating pulsation and noise of the refrigerant
compressed at the compression chamber and discharged therefrom.
[0067] Thus, in the one embodiment of the present invention, though
functions of the pipes 34, 36, and 38 connected to the lower case
30 are configured to be interchangeable, even if functions of the
pipes are changed, there is no design change of configuration
except the suction muffler 60.
[0068] In the preferred embodiment of the present invention, since
the suction muffler is provided between the first pipe and the
second pipe, an inside space for mounting the power supply device
including the inside connector 33a on the terminal fitting part
becomes greater, relatively.
[0069] Because a space between the lower case 30 and the suction
muffler is the smallest as the suction muffler 60 is arranged
projected the outer most among components of the compressor for
connected to the first pipe or the second pipe 36.
[0070] In the meantime, it is preferable that the hermetic
container has entire surface formed as curved surface. As
described, the hermetic container has the upper case and the lower
case, and FIG. 5 or 6 illustrates a preferred embodiment of the
upper case of the hermetic container.
[0071] Referring to FIGS. 5 and 6, the upper case 40 is provided to
a top of the lower case 30, such that the upper case 40 and the
lower case 30 form an upper half and a lower half of the hermetic
container 20, to form the hermetic container with a curved surface
in overall, to have a structure of a reinforced strength.
[0072] The upper case 70 has a side surface part 71 and an upper
surface part 73. The side surface part 71 and the upper surface
part 73 are curved respectively. A curvature of the upper surface
part 73 is relatively greater than the side surface part 71.
[0073] The upper surface part 73 is a curved surface sloped
downward from a left side to a right side, slightly. Such a curved
surface of the upper surface part 73 increases strength of the
part, relatively.
[0074] The upper surface part 73 at a relatively high part of the
upper case 70 that forms an upper outside appearance of the
compressor has a relatively great strength by a supporting force of
the side surface part 71, and can endure relatively high external
force owing to the curved surface of the upper surface part 73,
thereby protect the inside components, because the curved surface
of the upper surface part 73 spreads an external impact. This is
similar to a case of a tunnel of which upper part is curved.
[0075] An extent of strength increase owing to the curved surface
73 of the upper case 70 is illustrated in FIG. 7.
[0076] Referring to FIG. 7, a solid line denotes a natural
frequency of a case the upper case 70 described above is applied to
the compressor, and the dashed line denotes a case the upper case
of the related art is applied to the compressor.
[0077] That is, it can be noted that a case the upper case 70 of
the present invention is applied to the compressor has a relatively
high natural frequency, in a range approx. 1.3 times of the related
art, substantially.
[0078] The upper case 70 has a plurality of recesses 75 into an
inside of the case when seen from an outside of the upper case 70,
and projected from the upper case 70 when seen from an inside of
the upper case 70. The recesses 75 not only functions to increase
strength of the hermetic container, but also functions as a stopper
that prevents the inside components from shaking excessively, to
minimize shaking of the inside components.
[0079] It is preferable that the recesses are formed at a part the
side surface part 71 and the upper surface part 73 of the upper
case meet. Though the embodiment illustrates three recesses 75, a
number of the recesses 75 are not necessarily 3, but it is
preferable that at least two of the recesses 75 are formed at
opposite positions according to design conditions of the inside
components. For an example, since a direction of vibration of the
frame can be the same with the reciprocating direction of the
piston 50, it is preferable that the recesses 75 are formed at
opposite ends of the reciprocating direction of the piston.
[0080] The operation of the compressor of the present invention
will be described, in detail.
[0081] In the compressor shown in FIG. 1, the refrigerant is drawn
from an outside of the compressor through a first pipe 34, and
flows to the suction muffler 60 through the suction hole 62. Then,
the refrigerant is introduced into the compression chamber of the
cylinder through the valve assembly 54 in a state noise of the
refrigerant is reduced at the suction muffler 60.
[0082] The refrigerant compressed at the compression chamber by the
piston is discharged to an inside of the head cover 56, and flows
into the discharge muffler 65, and involved in attenuation of
pulsation and noise thereof. The refrigerant flows from the
discharge muffler 65 to the third pipe 38 that functions as a
discharge pipe through the loop pipe 67, and is guided to an
outside of the compressor.
[0083] In the meantime, the piston 50 coupled to the crankshaft 45,
rotated by electromagnetic interaction between the rotor 43 and the
stator 42 of the motor part, with the connecting rod 48
reciprocates linearly, and compresses the refrigerant.
[0084] Next, in the compressor illustrated in FIG. 3, only the
suction muffler 60 is changed while other components are mounted
the same with a state illustrated in FIG. 1 without design change
such the second pipe 36 functions as the suction pipe, and the
first pipe 34 functions as the process pipe.
[0085] In the present invention, since the inside connector 33a is
arranged at a position perpendicular to a position the cylinder 52
and an inside surface of the lower case 30 are opposite, a worker
can connect the motor part and the inside connector 33a more
easily, and since the third pipe 38 is arranged at an opposite side
of the inside connector 33a, the connection between the third pipe
38 and the loop pipe 67 is also easy.
[0086] The overall curved shape of the hermetic container and the
stoppers on the upper case 70 reinforces strength and prevents
damage of the inside components.
[0087] The compressor of the present invention has the following
advantages.
[0088] First, when the suction muffler is changed, functions of the
pipes in the lower case can be used selectively, thereby dispensing
with requirement for design change of the compressor in a heat
exchange cycle.
[0089] Second, the larger space between a configuration for
supplying power to an inside of the compressor and an inside
configuration fastened to the frame permits an easy connection for
supply power.
[0090] Third, the larger space between an inside wall of the
hermetic container and the frame at a part the discharge pipe is
connected to the loop pipe permits an easy connection of the loop
pipe to the discharge pipe.
[0091] Fourth, the overall curved surface of the hermetic
container, and the stoppers in the upper case for minimizing
shaking of the inside components permits reinforcement of strength,
and prevents damage of the inside components.
[0092] It will be apparent to those skilled in the art that various
modifications and variations can be made in the present invention
without departing from the spirit or scope of the invention. Thus,
it is intended that the present invention cover the modifications
and variations of this invention provided they come within the
scope of the appended claims and their equivalents.
* * * * *