U.S. patent application number 13/695881 was filed with the patent office on 2013-12-12 for discharge silencer for a hermetically encapsulated refrigerant compressor.
This patent application is currently assigned to ACC AUSTRIA GMBH. The applicant listed for this patent is Alfred Freiberger, Michaela Kohl, Herwig Kulmer, Guenther Zippl. Invention is credited to Alfred Freiberger, Michaela Kohl, Herwig Kulmer, Guenther Zippl.
Application Number | 20130330214 13/695881 |
Document ID | / |
Family ID | 44904133 |
Filed Date | 2013-12-12 |
United States Patent
Application |
20130330214 |
Kind Code |
A1 |
Freiberger; Alfred ; et
al. |
December 12, 2013 |
DISCHARGE SILENCER FOR A HERMETICALLY ENCAPSULATED REFRIGERANT
COMPRESSOR
Abstract
The invention relates to a discharge silencer (6) for a
hermetically encapsulated refrigerant compressor (1), which
comprises a piston/cylinder unit (4) that compresses a refrigerant
and has a compression chamber (3) and which is enclosed by a
hermetically sealed compressor housing (2), wherein the compression
chamber (3) is supplied with refrigerant coming from an evaporator
through a suction silencer (5) and discharges refrigerant
compressed by the piston/cylinder unit (4) into a pressure line
(7a, b) through the discharge silencer (6). According to the
invention, the discharge silencer (6) comprises a main body (8), on
which an inlet flange (9) for the refrigerant coming from the
piston/cylinder unit (4) is arranged, and an outlet channel (10),
through which the refrigerant can be led into a pressure line (7a,
b) that supplies a condenser with compressed refrigerant. The main
body (8) has four side walls (11, 12, 13, 14), which each have a
longitudinal extension and a width extension that is shorter than
the longitudinal extension, wherein the two side walls (11, 12)
having larger areas are opposite each other and are curved in the
same direction when viewed in a direction parallel to the
longitudinal extension.
Inventors: |
Freiberger; Alfred;
(Grosswilfersdorf, AT) ; Kohl; Michaela;
(Grosswilfersdorf, AT) ; Kulmer; Herwig;
(Pischelsdorf, AT) ; Zippl; Guenther; (Kukmim,
AT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Freiberger; Alfred
Kohl; Michaela
Kulmer; Herwig
Zippl; Guenther |
Grosswilfersdorf
Grosswilfersdorf
Pischelsdorf
Kukmim |
|
AT
AT
AT
AT |
|
|
Assignee: |
ACC AUSTRIA GMBH
Fuerstenfeld
AT
|
Family ID: |
44904133 |
Appl. No.: |
13/695881 |
Filed: |
May 4, 2011 |
PCT Filed: |
May 4, 2011 |
PCT NO: |
PCT/AT2011/000213 |
371 Date: |
July 1, 2013 |
Current U.S.
Class: |
417/313 |
Current CPC
Class: |
F04B 39/0061 20130101;
F04B 39/0072 20130101; F04B 39/0027 20130101; F04C 29/068 20130101;
F04B 39/121 20130101 |
Class at
Publication: |
417/313 |
International
Class: |
F04C 29/06 20060101
F04C029/06 |
Foreign Application Data
Date |
Code |
Application Number |
May 4, 2010 |
AT |
GM 290/2010 |
Claims
1-11. (canceled)
12. Hermetically encapsulated refrigerant compressor (1), having a
piston/cylinder unit (4) that compresses a refrigerant and has a
compression chamber (3), and is driven by an electric motor (25),
as well as a hermetically sealed compressor housing (2) that
surrounds this unit, wherein the compression chamber (3) is
supplied with a refrigerant coming from an evaporator, by way of a
suction silencer (5), and discharges compressed refrigerant into a
pressure line (7a, b), by way of a discharge silencer (6), by means
of the piston/cylinder unit (4), wherein the discharge silencer (6)
surrounds and sheathes an edge or bend (23) of the electric motor
(25) or a part of it and/or of the piston/cylinder unit (4), seen
in the viewing direction of the edge or bend (23), wherein the
discharge silencer (6) has a basic body (8) on which an inlet
flange (9) for the refrigerant coming from the piston/cylinder unit
(4) is disposed, and an outlet channel (10), by way of which the
refrigerant can be transferred to a pressure line (7a, b) that
supplies a condenser with compressed refrigerant, and which basic
body (8) has four side walls (11, 12, 13, 14), each having a
longitudinal expanse and a shorter width expanse, in comparison
with the former, wherein the two side walls (11, 12) that have a
larger surface area lie opposite one another and are configured to
be curved, in the same direction, in each instance, when viewed in
a viewing direction parallel to the longitudinal expanse; wherein
the curvature of the one of the side walls (12) that is larger in
surface area takes place discontinuously, in the form of at least
two partial surfaces (12a, 12b) disposed at an angle relative to
one another; wherein the discharge silencer (6) is attached to the
piston/cylinder unit (4) in such a manner that the edge (15) formed
between the at least two partial surfaces (12a, 12b) runs directly
in front of the edge or bend (23) of the electric motor (25))
and/or of the piston/cylinder unit (4); and wherein the curvature
of the other of the side walls (11) that is larger in surface area
corresponds, at least in certain sections, to the curvature of the
compressor housing (2) in the region of the placement of the
discharge silencer within the compressor housing (2), seen in a
viewing direction along the axis (27) of the crankshaft (26) of the
electric motor (25).
13. Hermetically encapsulated refrigerant compressor (1) according
to claim 12, wherein the edge or bend (23) is an edge of the stator
sheet-metal package (24) of the electric motor (25).
14. Hermetically encapsulated refrigerant compressor (1) according
to claim 12, wherein the curvature of the other side wall (11) that
is larger in surface area takes place continuously, preferably
following the shape of an arc.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a discharge silencer for a
hermetically encapsulated refrigerant compressor, which comprises a
piston/cylinder unit that compresses a refrigerant and has a
compression chamber, and is surrounded by a hermetically sealed
compressor housing, wherein the compression chamber is supplied
with refrigerant coming from an evaporator, by way of a suction
silencer, and discharges compressed refrigerant compressed by the
piston/cylinder unit, into a pressure line, by way of the discharge
silencer.
STATE OF THE ART
[0002] The use of such discharge silencers in refrigerant
compressor technology is sufficiently known and serves for reducing
the noise emissions of the refrigerant compressor that occur during
the discontinuous compression of refrigerant. Both metallic
discharge silencers and nonmetallic variants are known. Depending
on the placement and configuration of the discharge silencer,
different frequency ranges can be silenced. Discharge silencers are
characterized in that a chamber system is configured in the volume
of a basic body, through which system compressed refrigerant must
flow relatively shortly after its compression, in order to be able
to achieve the desired silencing, on the one hand, but on the other
hand also to be able to impede heat losses of the hot refrigerant
after the compression process, in the discharge silencer, which has
large surface areas as compared with the pressure line. In this
connection, the configuration of the chamber system is based
primarily on the frequency range to be silenced, but also on heat
technology aspects.
[0003] The requirement of building the discharge silencer as close
as possible to the outlet valve of the piston/cylinder unit, in
order to achieve optimal silencing and minimal heat losses, is
often connected with space problems in practice, and has led to the
result that discharge silencers are often disposed to disruptively
project from the cylinder head of the piston/cylinder unit into the
interior of the compressor housing, which has effects, among other
things, on the size of the compressor housing, which appears to
bulge unnaturally at this location.
[0004] Within the course of an increase in resource efficiency and
an accompanying reduction in the size of refrigerant compressors,
as well as of their hermetically sealed compressor housings,
however, it is desirable to accommodate the discharge silencer in
the compressor housing in as space-saving a manner as possible.
PRESENTATION OF THE INVENTION
[0005] It is therefore the task of the present invention to provide
a discharge silencer for a hermetically sealed refrigerant
compressor, which takes up as little space as possible in the
interior of the compressor housing.
[0006] According to the invention, this is achieved, in the case of
a discharge silencer of the type mentioned initially, in that the
discharge silencer has a basic body on which an inlet flange for
the refrigerant coming from the piston/cylinder unit is disposed,
and an outlet channel, by way of which the refrigerant can be
transferred to a pressure line that supplies a condenser with
compressed refrigerant, and which basic body has four side walls,
each having a longitudinal expanse and a shorter width expanse, in
comparison with the former, whereby the two side walls that have a
greater surface area lie opposite one another and are configured to
be curved, in the same direction, in each instance, when viewed in
a viewing direction parallel to the longitudinal expanse.
[0007] The circumstance that the discharge silencer has two side
walls that are curved in the same direction, in each instance,
allows placement around a corner/edge or bend of the
piston/cylinder unit and/or of components of the electric motor.
Because of the two curvatures according to the invention, the
discharge silencer can lie closely against the piston/cylinder unit
or the electric motor with the one side wall, on the one hand, but
also closely against the inside wall of the compressor housing, in
order to consequently be able to also build the compressor housing
as closely as possible to the piston/cylinder unit and to be able
to minimize the empty space in the interior of the compressor
housing.
[0008] According to a particularly preferred embodiment variant of
the invention, it is provided that the curvature of the one side
wall, which has a larger surface area, takes place constantly,
preferably following the shape of an arc. Such an embodiment allows
ideal adaptation of the discharge silencer to the usually
cylindrical or dome-shaped wall of the compressor housing.
[0009] According to another preferred embodiment variant of the
invention, it is provided that the curvature of the other side wall
that is larger in surface area takes place discontinuously, in the
form of at least two partial surfaces disposed at an angle relative
to one another. The side wall of the discharge silencer can
therefore be placed closely against an edge or bend of the electric
motor (and/or components of it) and/or the piston/cylinder
unit.
[0010] In order to achieve good silencing properties at a
simultaneously compact construction of the discharge silencer, it
is provided, according to another preferred embodiment variant,
that the volume of the basic body is divided into different
chambers, by means of multiple partitions that connect the two side
walls.
[0011] Claim 5 relates to a hermetically encapsulated refrigerant
compressor, having a piston/cylinder unit that compresses a
refrigerant and has a compression chamber, and is driven by an
electric motor, as well as a hermetically sealed compressor housing
that surrounds this unit, whereby the compression chamber is
supplied with a refrigerant coming from an evaporator, by way of a
suction silencer, and discharges compressed refrigerant into a
pressure line, by way of the discharge silencer, by means of the
piston/cylinder unit. While achieving the advantages already
described in the introduction, it is provided, according to the
invention, that the discharge silencer surrounds and sheathes an
edge or bend of the electric motor or a part of it and/or of the
piston/cylinder unit, seen in the viewing direction of the edge or
bend.
[0012] In a particularly spatially economical embodiment variant of
the invention, the edge or bend is an edge of the stator
sheet-metal package of the electric motor.
[0013] In a manner according to the invention, the discharge
silencer comprises a basic body on which an inlet flange for the
refrigerant coming from the piston/cylinder unit is disposed, and
an outlet channel by way of which the refrigerant can be
transferred to a pressure line that supplies a condenser with
compressed refrigerant, and which basic body has four side walls,
of which the two side walls that are larger in surface area and lie
opposite one another are structured to be curved in the same
direction, in each instance.
[0014] According to a preferred embodiment variant, the curvature
of the one side wall that is larger in surface area takes place
continuously, preferably following the shape of an arc.
[0015] According to another preferred embodiment variant, the
curvature of the other side wall that is larger in surface area
takes place discontinuously, i.e. approximately in the shape of at
least two partial surfaces disposed at an angle relative to one
another.
[0016] The discharge silencer is advantageously attached to the
piston/cylinder unit in such a manner that the edge region formed
between the at least two partial surfaces runs directly in front of
and essentially parallel to the edge or bend of the electric motor
and/or of the piston/cylinder unit. In this manner, a particularly
space-saving arrangement of the discharge silencer within the
compressor housing is made possible.
[0017] The space utilization within the compressor housing is
further optimized in that, according to another preferred
embodiment variant of the invention, it is provided that the
curvature of one of the side walls that is larger in surface area
corresponds, at least in certain sections, to the curvature of the
compressor housing in the region of the placement of the discharge
silencer within the compressor housing, seen in a viewing direction
along the axis of the crankshaft of the electric motor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] A brief description of the invention using figures of an
exemplary embodiment now follows. These show:
[0019] FIG. 1 a schematic overall view of a hermetically
encapsulated refrigerant compressor having a discharge silencer
according to the invention (top view)
[0020] FIG. 2 a side view of the refrigerant compressor from FIG.
1, with the compressor housing partly in section
[0021] FIG. 3 an axonometric slanted view of a discharge silencer
according to the invention
[0022] FIG. 4 a bottom view of a discharge silencer according to
the invention
[0023] FIG. 5 a sectional view of the discharge silencer according
to the invention
[0024] FIG. 6 another axonometric slanted view of the discharge
silencer according to the invention
[0025] FIG. 7 a sectional view along line AA from FIG. 8
[0026] FIG. 8 a side view of a hermetically encapsulated
refrigerant compressor, without the upper part of the compressor
housing
[0027] FIG. 3 shows an axonometric slanted view of a discharge
silencer 6 according to the invention, to be installed in a
refrigerant compressor 1, having a basic body 8 and an inlet flange
9 for a refrigerant coming from the piston/cylinder unit 4 (see
FIG. 1). The basic body 8 has an elongated shape and possesses four
side walls 11, 12, 13, 14, each having a longitudinal expanse 33
and a width expanse that is shorter, in comparison with the former,
which side walls, in a lower end region, are delimited by or make a
transition into a floor section 28 that is essentially flat and
runs orthogonal to the side walls 11, 12, 13, 14, which section can
be configured as a separate component. In an upper end region, the
side walls 11, 12, 13, 14 run out into the inlet flange 9. As can
be seen in FIG. 3 and FIG. 6, in this connection, a cap-shaped
ceiling section 29 is configured in the transition region between
the side walls 11, 12, 13 and the inlet flange 9.
[0028] The hermetically encapsulated refrigerant compressor 1, as
can be seen in FIG. 1 and FIG. 2, in which the discharge silencer 6
according to the invention is installed, is surrounded by a
hermetically sealing compressor housing 2, the upper part of which
is not shown in FIG. 1, whereby a piston/cylinder unit 4 driven by
an electric motor 25 having a rotor 42 is disposed within the
compressor housing 2. The piston/cylinder unit 4 comprises a piston
4a that oscillates in a cylinder housing 4b and compresses a
refrigerant in a compression chamber 3, in known manner, and
conveys it in the direction of the discharge silencer 6 according
to the invention. Also evident in FIG. 1 are a crankshaft 26 that
can rotate about an axis 27, having a crankshaft journal 26a that
is disposed eccentric to the axis 27, on which a connecting rod 30
that drives the piston 4a is linked.
[0029] The refrigerant compressed in the compression chamber 3 is
first drawn in from the compressor housing, which it reaches by way
of a suction line 34 that comes from an evaporator that withdraws
heat from a cooling chamber, by the piston 4a, by way of a suction
silencer 5.
[0030] In the floor section 28 of the discharge silencer 6, an
outlet channel 10 is provided, by way of which the refrigerant can
be transferred to a pressure line 7a, b that supplies a condenser
with compressed refrigerant.
[0031] As is particularly evident also in FIG. 4, which shows a
view in the direction of the longitudinal expanse 33 of the
discharge silencer 6, it is provided, according to the invention,
that of the four side walls 11, 12, 13, 14 of the basic body 8, the
two side walls 11 and 12, which have a larger surface area, lie
opposite one another and are structured to be curved in the same
direction, in each instance.
[0032] In this manner, it is possible that the discharge silencer 6
surrounds and sheathes an edge or bend 23 of the electric motor 25
or of parts of it and/or of the piston/cylinder unit 4 (see, in
particular, FIG. 7). In the present exemplary embodiment, the edge
or bend 23 sheathed by the discharge silencer 6 is an edge or bend
23 of a stator sheet-metal package 24 of the electric motor 25. In
the following, for the sake of clarity, reference is made only to
the concrete exemplary embodiment. However, it is clear to a person
skilled in the art that the present invention relates very
generally to a discharge silencer that can also sheathe and
surround parts of the piston/cylinder unit, in addition or
completely as an alternative.
[0033] What is meant with sheathe and surround according to the
invention is that the sections of the discharge silencer 6 that run
on the left and the right of the edge or bend 23 run as close as
possible to the electric motor 25 or parts of it and/or to the
piston/cylinder unit 4, in a viewing direction along the edge or
bend 23, or, alternatively, that the side surface 12 of the
discharge silencer 6 that faces the edge or bend 23 forms the
negative counterpart to the contour of the electric motor 25 or
parts of it and/or of the piston/cylinder unit 4, in the region of
the edge or bend 23.
[0034] FIG. 7 shows the edge or bend 23 of the stator sheet-metal
package 24 in detail. For the sake of clarity, in FIG. 7 the
cylinder housing 4b as well as parts of the electric motor 25 were
cut away, as is evident from FIG. 8. In this connection, the
outline edges 41 of the stator sheet-metal package 24 that run on
the left and the right of the edge or bend 23, or, to state it more
precisely, of the individual stator lamellae that are disposed to
lie on top of one another, can once again have any desired shape,
in other words can either be configured to run straight, as is
shown in FIG. 7, on the left (solid line) and the right (broken
line) of the edge or bend 23, or to have an irregular curvature, as
is shown in FIG. 7 to the right of the edge of bend 23, with solid
lines, depending on the requirements.
[0035] As is evident in FIG. 4, the curvature of the side wall 11
that faces away from the electric motor 25 or the piston/cylinder
unit 4 runs continuously, preferably following the shape of an
arc.
[0036] The side wall 12 that lies opposite the side wall 11, facing
the electric motor 25 or the piston/cylinder unit 4, in contrast,
can run discontinuously, for example as shown, in the form of at
least two partial surfaces 12a, 12b that approximate a constant
curvature and are disposed at an angle relative to one another. In
other words, the side wall 12 has at least one kink or edge region
15 that divides the side wall 12 into at least two partial surfaces
12a, 12b.
[0037] The angle drawn in FIG. 4, measured between the outer
surfaces of the partial surfaces 12a, 12b (facing the electric
motor 25 or the piston/cylinder unit 4), is less than 180.degree.
and preferably greater than 90.degree.. In the present exemplary
embodiment, the angle between the partial surfaces 12a and 12b of
the side wall 12 amounts to approx. 150.degree..
[0038] In the present exemplary embodiment, the discharge silencer
6 is attached to the piston/cylinder unit 4 in such a manner that
the edge region 15 formed between the at least two partial surfaces
12a, 12b runs directly in front of the edge or bend 23 of the
electric motor 25 or the piston/cylinder unit 4.
[0039] Furthermore, it can be provided that the curvature of the
side wall 11 corresponds, at least in certain sections, to the
curvature of the compressor housing 2, in the region of the
placement of the discharge silencer 6 within the compressor housing
2, seen in a viewing direction long the axis 27 of the crankshaft
26 of the electric motor 25.
[0040] As is evident in FIG. 3, the opening of the inlet flange 9
of the discharge silencer 6 according to the invention possesses an
essentially kidney-shaped cross-section, which, in the installed
position, follows the cylinder housing 4b of the piston/cylinder
unit 4 shown in FIG. 1, or, to state it more precisely, a valve
plate 35 that delimits the compression chamber 3 of the cylinder
housing 4b, whereby the opening cross-section of the inlet flange 9
encloses and seals one or more pressure openings present in the
valve plate 35.
[0041] In a preferred embodiment variant, the inlet flange 9 of the
suction silencer 6 is attached to the cylinder housing 4b by means
of one or more attachment elements 38, whereby the at least one
attachment element 38 presses the inlet flange 9 against the
cylinder housing 4b in the axial direction of the piston bore. Such
an arrangement is already disclosed in connection with the
attachment of a cylinder head in EP 1888918 B1.
[0042] In the exemplary embodiment according to FIG. 1, the
attachment element 38 is configured as a clamping element, which
engages into the outer mantle of the cylinder housing 4b, on
corresponding undercuts 40, with three shank-shaped end regions
38a, for example (see FIG. 2).
[0043] In a preferred embodiment variant of the invention, the
basic body 8 of the discharge silencer 6 according to the invention
extends from a region adjacent to the valve plate 35, in the
direction of the electric motor 25 or in the direction of a floor
region 39 of the compressor housing 2. The predominant part of the
discharge silencer 6 is therefore disposed below the
piston/cylinder unit 4, viewed in an operating position of the
refrigerant compressor 1.
[0044] As can be seen in a sectional representation according to
FIG. 5, the volume of the basic body 8 of the discharge silencer 6
is divided into different (in the present exemplary embodiment:
five) chambers 19, 20, 21, 22, 36, by means of multiple partitions
16, 17, 18, 19 that connect the side walls 11, 12.
[0045] In this connection, the refrigerant indicated with arrows
31a-c in FIG. 5 flows through all the chambers 19, 20, 21, 22, 36,
before it is transferred out of the discharge silencer 6 to the
pressure line 7a, b, by way of the outlet channel 10.
[0046] As is evident in FIG. 5, the refrigerant that comes from the
inlet flange 9 is divided into two refrigerant streams 31a and 31b
that flow in the direction of the floor section 28, by means of a
first partition 16; these streams combine again to form a
refrigerant stream 31c in a collection region 32 adjacent to the
floor section 28, and enter into the third chamber 21. In this
connection, the refrigerant stream 31c is deflected by 180.degree.
and guided upward again, i.e. in a direction facing away from the
floor section 28, before it is deflected by 180.degree. once again
in the region of the ceiling section 29 (of the third chamber 21)
and conveyed, over its further course, into the pressure line 7a,
b, through the outlet channel 10. Analogous to the flow processes
that take place in the third chamber 21, the refrigerant also flows
through the fourth chamber 22 and the fifth chamber 36: Refrigerant
streams 31c' and 31c'' are guided from the floor section 28 to the
ceiling section 29 and once again back to the floor section 28 (of
the chambers 22, 36), before the refrigerant streams 31c' and 31c''
leave the discharge silencer 6 through the outlet channel 10. In
the outlet channel 10, all the refrigerant streams guided through
the chambers 19, 20, 21, 22, and 36 therefore combine.
REFERENCE SYMBOL LIST
[0047] 1 refrigerant compressor [0048] 2 compressor housing [0049]
3 compression chamber [0050] 4 piston/cylinder unit [0051] 4a
piston [0052] 4b cylinder housing [0053] 5 suction silencer [0054]
6 discharge silencer [0055] 7a, b pressure line [0056] 8 basic body
of the discharge silencer [0057] 9 entry flange [0058] 10 outlet
channel [0059] 11 side wall of the discharge silencer [0060] 12
side wall of the discharge silencer [0061] 12a, 12b partial
surfaces of the side wall 12 [0062] 13 side wall of the discharge
silencer [0063] 14 side wall of the discharge silencer [0064] 15
edge on side wall 12 [0065] 16 first partition [0066] 17 second
partition [0067] 18 third partition [0068] 19 first chamber [0069]
20 second chamber [0070] 21 third chamber [0071] 22 fourth chamber
[0072] 23 edge/bend of the electric motor [0073] 24 stator
sheet-metal package [0074] 25 electric motor [0075] 26 crankshaft
[0076] 27 axis of the crankshaft 26 [0077] 28 floor section of the
discharge silencer 6 [0078] 29 ceiling section of the discharge
silencer 6 [0079] 30 connecting rod [0080] 31a, 31b, 31c, 31c',
31c'' refrigerant streams [0081] 32 collection region [0082] 33
longitudinal expanse of the side surfaces of the basic body [0083]
34 suction line [0084] 35 valve plate [0085] 36 fifth chamber
[0086] 37 fourth partition [0087] 38 attachment element [0088] 39
floor region of the compressor housing 2 [0089] 40 undercuts on
cylinder housing 4b [0090] 41 outline edges of the stator
sheet-metal package or the stator lamellae [0091] 42 rotor of the
electric motor
* * * * *