U.S. patent application number 12/259758 was filed with the patent office on 2009-05-07 for compressor with muffler.
Invention is credited to Roy J. Doepker, Michael M. Perevozchikov.
Application Number | 20090116977 12/259758 |
Document ID | / |
Family ID | 40588245 |
Filed Date | 2009-05-07 |
United States Patent
Application |
20090116977 |
Kind Code |
A1 |
Perevozchikov; Michael M. ;
et al. |
May 7, 2009 |
Compressor With Muffler
Abstract
A compressor assembly may include a shell, a discharge fitting,
a muffler, a compression mechanism, and a motor. The shell may have
an opening therethrough with the discharge fitting generally
extending therefrom. The muffler may be in communication with the
discharge fitting and may be external to the shell. The muffler may
have an inlet proximate the discharge fitting, an outlet distal
from the discharge fitting, and a body portion extending
therebetween. The muffler may include a valve assembly proximate
the outlet. The compression mechanism may be contained within the
shell and include a suction inlet and a discharge passageway. The
discharge passageway may be connected to the opening in the shell
for direct discharge of refrigerant from the compression mechanism
to the discharge fitting. The motor may be contained within the
shell and drivingly coupled to the compression mechanism.
Inventors: |
Perevozchikov; Michael M.;
(Tipp City, OH) ; Doepker; Roy J.; (Lima,
OH) |
Correspondence
Address: |
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. BOX 828
BLOOMFIELD HILLS
MI
48303
US
|
Family ID: |
40588245 |
Appl. No.: |
12/259758 |
Filed: |
October 28, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60984908 |
Nov 2, 2007 |
|
|
|
Current U.S.
Class: |
417/312 |
Current CPC
Class: |
F04C 29/065 20130101;
F04C 29/126 20130101; F04C 23/008 20130101; F04C 18/02 20130101;
F04C 29/0035 20130101 |
Class at
Publication: |
417/312 |
International
Class: |
F04B 39/00 20060101
F04B039/00 |
Claims
1. A compressor assembly comprising: a shell having an opening
therethrough; a discharge fitting generally extending from said
opening in said shell; a muffler in communication with said
discharge fitting and external to said shell, said muffler having
an inlet proximate said discharge fitting, an outlet distal from
said discharge fitting, and a body portion extending therebetween;
a first valve assembly disposed proximate said outlet of said
muffler; and a compression mechanism disposed within said shell and
including a discharge passageway in communication with said opening
in said shell for direct discharge of refrigerant from said
compression mechanism to said discharge fitting.
2. The compressor assembly of claim 1, wherein said first valve
assembly is located within said body portion.
3. The compressor assembly of claim 1, wherein said first valve
assembly is contained within said outlet, said outlet having a
first portion internal to said body portion and a second portion
external to said body portion.
4. The compressor assembly of claim 3, wherein said first valve
assembly is located within said second portion of said outlet.
5. The compressor assembly of claim 3, wherein said first valve
assembly is located within said first portion of said outlet.
6. The compressor assembly of claim 3, wherein said outlet includes
a tubular member secured to said muffler body portion, a valve seat
secured to said tubular member, and a valve stop, said valve seat
and said valve stop defining a valve chamber, said valve assembly
including a valve member disposed within said valve chamber and
movable between a closed position where said valve member abuts
said valve seat and an open position where said valve member abuts
said valve stop.
7. The compressor assembly of claim 1, further comprising a second
valve assembly disposed between said discharge passageway and said
first valve assembly.
8. The compressor assembly of claim 1, wherein said first valve
assembly is configured to move to a closed position when a
direction of flow is from said outlet to said inlet, said closed
position generally preventing flow from passing from said outlet to
said inlet.
9. The compressor assembly of claim 1, wherein said first valve
assembly is configured to move to an open position when a direction
of flow is from said inlet to said outlet, said open position
generally allowing flow to pass from said inlet to said outlet.
10. The compressor assembly of claim 1, wherein said compression
mechanism includes first and second scroll members meshingly
engaged with one another to form a plurality of intermediate
compression pockets and a discharge pocket, a first and second of
said intermediate pockets immediately adjacent to said discharge
pocket defining a compression volume immediately prior to
communication between said first and second intermediate pockets
and said discharge pocket, a ratio between a total volume of said
muffler and said compression volume being between 5-to-1 and
20-to-1.
11. The compressor assembly of claim 1, wherein a ratio between a
cross-sectional area of said muffler taken generally perpendicular
to a fluid flow direction therethrough and a cross-sectional area
of said inlet being greater than 20-to-1.
12. The compressor assembly of claim 1, wherein said first valve
assembly is biased to an open position by gravity.
13. A compressor assembly comprising: a compressor having a
discharge fitting extending therefrom; and a muffler assembly
including a muffler having an inlet, an outlet, and a body portion
disposed between said inlet and said outlet, said inlet in
communication with said discharge fitting, at least a portion of
said inlet being external to said compressor, said outlet having a
valve assembly contained therein.
14. The compressor assembly of claim 13, wherein said outlet
includes a first portion internal to said body portion and a second
portion external to said body portion.
15. The compressor assembly of claim 14, wherein said valve
assembly is located within said second portion of said outlet.
16. The compressor assembly of claim 14, wherein said valve
assembly is located within said first portion of said outlet.
17. The compressor assembly of claim 14, wherein said outlet
includes a tubular member secured to said muffler body portion, a
valve seat secured to said tubular member, and a valve stop, said
valve seat and said valve stop defining a valve chamber, said valve
assembly including a valve member disposed within said valve
chamber and movable between a closed position where said valve
member abuts said valve seat and an open position where said valve
member abuts said valve stop.
18. The compressor assembly of claim 14, wherein said valve
assembly is biased to an open position by gravity.
19. A direct discharge compressor muffler comprising: an inlet; an
outlet; a body portion disposed between said inlet and said outlet;
and a valve assembly contained within said muffler proximate said
outlet, said valve assembly configured to prevent flow from passing
in a direction from said inlet to said outlet.
20. The muffler of claim 19, wherein said valve assembly is
contained within said outlet.
21. The muffler of claim 20, wherein said outlet includes a first
portion internal to said body portion and a second portion external
to said body portion.
22. The muffler of claim 21, wherein said valve assembly is located
within said second portion of said outlet.
23. The muffler of claim 21, wherein said valve assembly is located
within said first portion of said outlet.
24. The muffler of claim 20, wherein said outlet includes a tubular
member secured to said muffler body portion, a valve seat secured
to said tubular member, and a valve stop, said valve seat and said
valve stop defining a valve chamber, said valve assembly including
a valve member disposed within said valve chamber and movable
between a closed position where said valve member abuts said valve
seat and an open position where said valve member abuts said valve
stop.
25. The muffler of claim 19, wherein said valve assembly is located
within said body portion.
26. The muffler of claim 19, wherein said valve assembly is biased
to an open position by gravity.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application No. 60/984,908, filed on Nov. 2, 2007. The entire
disclosure of the above application is incorporated herein by
reference.
FIELD
[0002] The present disclosure relates to scroll compressors, and
more specifically to scroll compressor having mufflers.
BACKGROUND AND SUMMARY
[0003] The statements in this section merely provide background
information related to the present disclosure and may not
constitute prior art.
[0004] Direct discharge refrigerant compressors for cooling systems
such as air conditioning, refrigeration or chiller systems, may
include an external muffler to reduce a discharge pressure pulse
and/or noise. These compressors may also include a device to
prevent backflow during shutdown in order to prevent motor damage.
When the compressor is shut down, the compression mechanism is at a
lower pressure than the discharge fitting and the external muffler.
Without backflow prevention, refrigerant reverses direction in the
high-pressure region of the discharge fitting and flows into the
compression mechanism. This backflow may cause the compression
mechanism to operate in reverse, resulting in noise and potential
motor damage.
[0005] A compressor assembly includes a shell, a discharge fitting,
a muffler, a compression mechanism, and a motor. The shell includes
an opening therethrough with the discharge fitting generally
extending therefrom. The muffler is in communication with the
discharge fitting and may be external to the shell. The muffler
includes an inlet proximate the discharge fitting, an outlet distal
from the discharge fitting, and a body portion extending
therebetween. The muffler may include a valve assembly proximate
the outlet. The compression mechanism may be contained within the
shell and include a suction inlet and a discharge passageway. The
discharge passageway may be connected to the opening in the shell
for direct discharge of refrigerant from the compression mechanism
to the discharge fitting. The motor may be contained within the
shell and drivingly coupled to the compression mechanism.
[0006] The first valve assembly may be located within the body
portion of the muffler.
[0007] In a variation, the first valve assembly may be contained
within the outlet of the muffler. The outlet includes a first
portion internal to the body portion and a second portion external
to the body portion. The first valve assembly may be located within
the second portion of the outlet. In an alternate arrangement, the
first valve assembly may be located within the first portion of the
outlet. The outlet may include a tubular member secured to the
muffler body portion, a valve seat secured to the tubular member,
and a valve stop. The valve seat and the valve stop define a valve
chamber. The valve assembly may include a valve member disposed
within the valve chamber and movable between a closed position
where the valve member abuts the valve seat and an open position
where the valve member abuts the valve stop.
[0008] The compressor may additionally include a second valve
assembly disposed between the discharge passageway and the first
valve assembly. The first valve assembly may be configured to move
to a closed position when a direction of flow is from the outlet to
the inlet. The closed position may generally prevent flow from
passing from the outlet to the inlet. The first valve assembly may
be configured to move to an open position when a direction of flow
is from the inlet to the outlet. The open position may generally
allow flow to pass from the inlet to the outlet.
[0009] The compression mechanism may include first and second
scroll members meshingly engaged with one another to form a
plurality of intermediate compression pockets and a discharge
pocket. A first and second of the intermediate pockets immediately
adjacent to the discharge pocket define a compression volume
immediately prior to communication between the first and second
intermediate pockets and the discharge pocket. A ratio between a
total volume of the muffler and the compression volume may be
between 5-to-1 and 20-to-1. A ratio between a cross-sectional area
of the muffler taken generally perpendicular to a fluid flow
direction therethrough and a cross-sectional area of the inlet may
be greater than 20-to-1.
[0010] Further, the first valve assembly may be biased to an open
position by gravity.
[0011] In another arrangement, a compressor assembly may include a
compressor having a discharge fitting extending therefrom and a
muffler assembly. The muffler assembly may include a muffler having
an inlet, an outlet, and a body portion disposed between the inlet
and the outlet. The inlet is in communication with the discharge
fitting. At least a portion of the inlet may be external to the
compressor and the outlet may have a valve assembly contained
therein.
[0012] The outlet includes a first portion internal to the body
portion and a second portion external to the body portion. The
valve assembly may be located within the second portion of the
outlet. Alternatively, the valve assembly may be located within the
first portion of the outlet. The outlet may include a tubular
member secured to the muffler body portion, a valve seat secured to
the tubular member, and a valve stop. The valve seat and the valve
stop define a valve chamber. The valve assembly includes a valve
member disposed within the valve chamber and moveable between a
closed position where the valve member abuts the valve seat and an
open position where the valve member abuts the valve stop.
[0013] Further, the valve assembly may be biased to an open
position by gravity.
[0014] A direct discharge compressor muffler may include an inlet,
an outlet, a body portion disposed between the inlet and outlet,
and a valve assembly. The valve assembly may be contained within
the muffler and proximate the outlet. The valve assembly is
configured to prevent flow from passing in a direction from the
inlet to the outlet.
[0015] The valve assembly may be contained within the outlet. The
outlet includes a first portion internal to the body portion and a
second portion external to the body portion. The valve assembly may
be located within the second portion of the outlet. Alternatively,
the valve assembly may be located within the first portion of the
outlet. The outlet may include a tubular member secured to the
muffler body portion, a valve seat secured to the tubular member,
and a valve stop. The valve seat and the valve stop define a valve
chamber. The valve assembly includes a valve member disposed within
the valve chamber and moveable between a closed position where the
valve member abuts the valve seat and an open position where the
valve member abuts the valve stop.
[0016] The valve assembly may be located within the body portion.
The valve assembly may be biased to an open position by
gravity.
[0017] Further areas of applicability will become apparent from the
description provided herein. It should be understood that the
description and specific examples are intended for purposes of
illustration only and are not intended to limit the scope of the
present claims.
DRAWINGS
[0018] The drawings described herein are for illustration purposes
only and are not intended to limit the scope of the teachings in
any way.
[0019] FIG. 1 is a section view of a compressor and muffler
assembly;
[0020] FIG. 2 is a section view of the compressor of FIG. 1;
[0021] FIG. 3 is a section view of a muffler assembly;
[0022] FIG. 4 is a section view of an alternate muffler
assembly;
[0023] FIG. 5 is a section view of a compressor; and
[0024] FIG. 6 is a schematic illustration of wraps of the
compressor of FIG. 1.
DETAILED DESCRIPTION
[0025] The following description is merely exemplary in nature and
is not intended to limit the present teachings, application, or
uses.
[0026] The present teachings are suitable for incorporation in many
different types of scroll and rotary compressors, including
hermetic machines, open drive machines and non-hermetic machines.
For exemplary purposes, a compressor assembly 10 is shown including
a hermetic scroll refrigerant motor-compressor 12 of the low-side
type, i.e., where the motor and compressor are cooled by suction
gas in the hermetic shell, as illustrated in the vertical section
shown in FIGS. 1, 2, 4 and 5.
[0027] As shown in FIGS. 1 and 2, compressor assembly 10 includes
compressor 12 and an external muffler assembly 14. Compressor 12
may include a cylindrical hermetic shell 16, a compression
mechanism 18, a main bearing housing 20, a motor assembly 22, a
refrigerant discharge fitting 24, and a suction gas inlet fitting
26. The hermetic shell 16 may house the compression mechanism 18,
main bearing housing 20, and motor assembly 22. Shell 16 may
include an end cap 28 at the upper end thereof. The refrigerant
discharge fitting 24 is attached to shell 16 at opening 30 in end
cap 28. The suction gas inlet fitting 26 is attached to shell 16 at
opening 32. The compression mechanism 18 is driven by motor
assembly 22 and supported by main bearing housing 20. The main
bearing housing 20 may be affixed to shell 16 at a plurality of
points in any desirable manner.
[0028] The motor assembly 22 generally includes a motor 34, a frame
36 and a crankshaft 38. The motor 34 includes a motor stator 40 and
a rotor 42. The motor stator 40 may be press fit into frame 36,
which may in turn be press fit into shell 16. Crankshaft 38 is
rotatably driven by stator 40. Windings 44 pass through stator 40.
Rotor 42 may be press fit on crankshaft 38. A motor protector 46
may be provided in close proximity to windings 44 so that motor
protector 46 will de-energize motor 34 if windings 44 exceed their
normal temperature range.
[0029] Crankshaft 38 may include an eccentric crank pin 48 and one
or more counter-weights 50 at an upper end 52. Crankshaft 38 may be
rotatably journaled in a first bearing 54 in main bearing housing
20 and in a second bearing 56 in frame 36. Crankshaft 38 may
include an oil-pumping concentric bore 58 at a lower end 60.
Concentric bore 58 may communicate with a radially outwardly
inclined and relatively smaller diameter bore 62 extending to the
upper end 52 of crankshaft 38. The lower interior portion of shell
16 is filled with lubricating oil. Concentric bore 58 may provide
pump action in conjunction with bore 62 to distribute lubricating
fluid to various portions of compressor 12.
[0030] Compression mechanism 18 may generally include an orbiting
scroll 64 and a non-orbiting scroll 66. Orbiting scroll 64 may
include an end plate 68 having a spiral vane or wrap 70 on the
upper surface thereof and an annular flat thrust surface 72 on the
lower surface. Thrust surface 72 may interface with an annular flat
thrust bearing surface 74 on an upper surface of main bearing
housing 20. A cylindrical hub 76 may project downwardly from thrust
surface 72 and may include a journal bearing 78 having a drive
bushing 80 rotatively disposed therein. Drive bushing 80 may
include an inner bore in which crank pin 48 is drivingly disposed.
Crank pin 48 may have a flat on one surface (not shown) that
drivingly engages a flat surface in a portion of the inner bore of
drive bushing 80 to provide a radially compliant driving
arrangement, such as shown in assignee's U.S. Pat. No. 4,877,382,
the disclosure of which is herein incorporated by reference.
[0031] Non-orbiting scroll member 66 may include an end plate 82
having a non-orbiting spiral wrap 84 on lower surface 86 thereof.
Non-orbiting spiral wrap 84 may form a meshing engagement with wrap
70 of orbiting scroll member 64, thereby creating an inlet pocket
88, intermediate pockets 90, 92, 94, 96, and discharge pocket 98.
Non-orbiting scroll 66 may have a centrally disposed discharge
passageway 100 in communication with discharge pocket 98 and
upwardly open recess 102 which may be in fluid communication with
discharge fitting 24. A floating seal 104 may be located around
recess 102 and may abut shell 16, thereby providing sealed
communication between discharge passageway 100 and discharge
fitting 24, while allowing axial displacement of non-orbiting
scroll 66 relative to shell 16.
[0032] Non-orbiting scroll 66 may be mounted to main bearing
housing 20 in any manner that will provide limited axial movement
of non-orbiting scroll member 66. For a more detailed description
of the non-orbiting scroll suspension system, see assignee's U.S.
Pat. No. 5,055,010, the disclosure of which is hereby incorporated
herein by reference. Axial pressure biasing may be included in
compressor 12, as disclosed in assignee's aforesaid U.S. Pat. No.
4,877,382, A capacity modulation system may also be included in the
system, as described in assignee's aforesaid U.S. Pat. No.
6,821,092.
[0033] Relative rotation of the scroll members 64, 66 may be
prevented by an Oldham coupling, which may generally include a ring
108 having a first pair of keys 110 (one of which is shown)
slidably disposed in diametrically opposed slots 112 (one of which
is shown) in non-orbiting scroll 66 and a second pair of keys (not
shown) slidably disposed in diametrically opposed slots in orbiting
scroll 64.
[0034] External muffler assembly 14 may include an inlet 114, an
outlet 116, and a body portion 118 extending therebetween. A first
end 120 of inlet 114 may extend into an inlet opening 122 in body
portion 118. A second end 124 of inlet 114 may extend into and be
coupled to refrigerant discharge fitting 24.
[0035] Outlet 116 may include first and second portions 126, 128
with a connecting portion 130 disposed therebetween. First and
second portions 126, 128 may be generally tubular with second
portion 128 having a diameter greater than the diameter of first
portion 126. Connecting portion 130 may have a radial extent and
generally form a stopping member.
[0036] A valve seat 132 may be located at an inlet to second
portion 128. Valve seat 132 may include apertures 134, 136 for
passage of a flow therethrough. Second portion 128, connecting
portion 130, and valve seat 132 may define a valve chamber 138.
Valve chamber 138 may house a valve member 140 therein.
[0037] Valve member 140 may include a disk-shaped body portion 142
having a centrally-disposed aperture 144 therethrough. Valve member
140 may be displaceable from a closed position to an open position
by a flow moving in a direction from second portion 128 to first
portion 126 and from an open position to a closed position by a
flow moving from first portion 126 to second portion 128. When in a
closed position, body portion 142 may generally cover apertures
134, 136. When in an open position, valve member 140 may be forced
away from apertures 134, 136 and generally toward connecting
portion 130.
[0038] In the example shown in FIG. 1, body portion 118 is shown
including an outlet opening 146 having a diameter generally equal
to the diameter of first portion 126 of outlet 116. As such, first
portion 126 may extend through outlet opening 146 while second
portion 128 and connecting portion 130 may be located within body
portion 118.
[0039] In FIG. 3, an external muffler assembly 214 is shown
generally similar to external muffler assembly 14, with the
exception of outlet opening 246 and outlet 216. Specifically,
outlet 216 is generally located external to body portion 218, as
described below. Outlet opening 246 may have a diameter generally
similar to the diameter of second portion 228. As such, second
portion 228 is disposed outside of body portion 218. More
specifically, valve seat 232 is located in outlet opening 246,
resulting in valve chamber 238 and valve member 240 being located
outside of body portion 218.
[0040] In yet another example, shown in FIG. 4, an external muffler
assembly 314 is shown generally similar to external muffler
assembly 214. However, external muffler assembly 314 is rotated
approximately one hundred and eighty degrees relative to external
muffler assembly 214 using U-shaped inlet conduit 414. Rather than
being biased to a closed position by gravity as seen in FIG. 3,
valve member 340 may be biased to an open position by gravity.
Valve member 340 may be forced to a closed position during
reverse-flow conditions.
[0041] While described in FIGS. 1-4 as having valve member 140,
240, 340 located within outlet 116, 216, valve member 140, 240, 340
may additionally or alternatively be located within body portion
118, 218, generally before second portion 128, 228 of outlet 116,
216. In another arrangement, shown in FIG. 5, a second valve member
248 may be located between external muffler assembly 14, 214 and
non-orbiting scroll 66. More specifically, second valve member 248
may be located within recess 102 above discharge passageway 100.
Second valve member 248 is shown having plate-like structure 250
and a hinge connection 252. However, any suitable valve assembly
may be used, such as one similar to valve member 140. Also, any
combination of FIGS. 1-5 may be used.
[0042] With reference to FIGS. 1, 3, 4 and 6, the ratio between the
volume of muffler assembly 14, 214, 314 more specifically body
portion 118, 218, and the intermediate pockets 92, 97 immediately
adjacent to discharge pocket 98 before communication between
intermediate pockets 92, 97 and discharge pocket 98 may be between
5-to-1 and 20-to-1. Intermediate pockets 92 and 97 may be combined
with discharge pocket 98 during a portion of the orbit of orbiting
scroll 64 (seen in FIGS. 1, 2 and 5). A ratio between the
cross-sectional area of body portion 118, 218 taken generally
perpendicular to a flow direction (D) and the cross-sectional area
of inlet 114 may generally be greater than or equal to 20-to-1.
[0043] The foregoing description of the embodiments has been
provided for purposes of illustration and description. It is not
intended to be exhaustive or to limit the invention. Individual
elements or features of a particular embodiment are generally not
limited to that particular embodiment, but, where applicable, are
interchangeable and can be used in a selected embodiment, even if
not specifically shown or described. The same may also be varied in
many ways. Such variations are not to be regarded as a departure
from the invention, and all such modifications are intended to be
included within the scope of the invention.
* * * * *