U.S. patent application number 12/439841 was filed with the patent office on 2010-06-17 for compressor.
Invention is credited to Robert Adler, Georg Siebert, Martin Stehrlein.
Application Number | 20100150746 12/439841 |
Document ID | / |
Family ID | 38669823 |
Filed Date | 2010-06-17 |
United States Patent
Application |
20100150746 |
Kind Code |
A1 |
Adler; Robert ; et
al. |
June 17, 2010 |
COMPRESSOR
Abstract
The invention relates to a compressor (1) for gaseous and/or
cryogenically liquefied media comprising a first compressor piston
(6) and a second compressor piston (7), which are operatively
connected to an eccentric shaft (2), wherein the second compressor
piston (7) is arranged substantially opposite to the first
compressor piston (6) relative to the eccentric shaft (2). To solve
the object of providing such a compressor with a small space
requirement and low construction costs, it is proposed according to
the invention for the compressor (1) to be embodied as an
oscillating piston-type compressor, wherein the first compressor
piston (6) is arranged on an eccentric ring (4), which is
effectively connected to the eccentric shaft (2) and wherein the
second compressor piston (7) is fastened to a pivot lug (8), which
is effectively connected to the eccentric ring (4).
Inventors: |
Adler; Robert; (Gerasdorf,
AT) ; Siebert; Georg; (Wien, AT) ; Stehrlein;
Martin; (Rust, AT) |
Correspondence
Address: |
The BOC Group, Inc.
575 MOUNTAIN AVENUE
MURRAY HILL
NJ
07974-2082
US
|
Family ID: |
38669823 |
Appl. No.: |
12/439841 |
Filed: |
August 2, 2007 |
PCT Filed: |
August 2, 2007 |
PCT NO: |
PCT/EP2007/006869 |
371 Date: |
January 19, 2010 |
Current U.S.
Class: |
417/254 ;
417/521 |
Current CPC
Class: |
F04B 25/005 20130101;
F04B 27/0414 20130101; F04B 27/02 20130101; F04B 27/005
20130101 |
Class at
Publication: |
417/254 ;
417/521 |
International
Class: |
F04B 25/00 20060101
F04B025/00; F04B 35/01 20060101 F04B035/01; F04B 27/00 20060101
F04B027/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 7, 2006 |
DE |
10 2006 042 122.1 |
Claims
1. A compressor for gaseous and/or cryogenically liquefied media
comprising a first compressor piston and a second compressor
piston, which are operatively connected to an eccentric shaft,
wherein the second compressor piston is arranged substantially
opposite to the first compressor piston relative to the eccentric
shaft, characterized in that the compressor is embodied as an
oscillating piston-type compressor, wherein the first compressor
piston is arranged on an eccentric ring, which is effectively
connected to the eccentric shaft and wherein the second compressor
piston is fastened to a pivot lug, which is effectively connected
to the eccentric ring.
2. The compressor according to claim 1, characterized in that a
fastening lug, to which the first compressor piston is fastened, is
embodied on the eccentric ring, wherein the pivot lug of the second
compressor piston is arranged on the eccentric ring in an
articulated manner in the area of the fastening lug of the first
compressor piston.
3. The compressor according to claim 1, characterized in that the
pivot lug is embodied as a bow-shaped component, which encompasses
a cross-plate, to which the second compressor piston is fastened
and two substantially ring-shaped side parts, which are spaced
apart from one another, wherein a receiving space for the eccentric
ring is embodied between the side parts.
4. The compressor according to claim 3, characterized in that a
receiving bore for a pivot pin is embodied on the side parts.
5. The compressor according to claim 4, characterized in that a
through hole for the pivot pin is embodied on the eccentric
ring.
6. The compressor according to claim 5, characterized in that the
pivot pin is supported in the through hole of the eccentric ring
via a bush.
7. The compressor according to claim 1, characterized in that the
compressor is embodied as a two-stage compressor, wherein the first
compressor piston forms the input stage and the second compressor
piston forms the output stage of the compressor.
8. The compressor according to claim 7, characterized in that the
first compressor piston is arranged in a first compressor cylinder
and the second compressor piston is arranged in a second compressor
cylinder, wherein the output of the first compressor cylinder is
connected to the input of the second compressor cylinder.
Description
[0001] The invention relates to a compressor for gaseous and/or
cryogenically liquefied media comprising a first compressor piston
and a second compressor piston, which are operatively connected to
an eccentric shaft, wherein the second compressor piston is
arranged substantially opposite to the first compressor piston
relative to the eccentric shaft.
[0002] Such compressors comprising two compressor pistons being
arranged opposite one another are used to compress gaseous media
and/or cryogenically liquefied (cryogenic) media, for example
nitrogen, natural gas or hydrogen. The compressor can hereby be
designed as a two-stage compressor, wherein the first compressor
piston forms the input stage and the second compressor piston forms
the output stage.
[0003] In known generic compressors comprising two compressor
pistons, the two compressor pistons are spaced apart in an axial
manner and are in each case connected to the eccentric shaft by
means of a piston rod, which is in each case supported on the
eccentric shaft and on the compressor piston in an articulated
manner. By means of the compressor pistons, which are spaced apart
in an axial manner, the compressor encompasses a large space
requirement in axial direction. The compressor pistons hereby
perform a linear motion in the corresponding compressor cylinder.
However, the connection of the compressor piston to the eccentric
shaft by means of the piston rod leads to high lateral guide forces
at the compressor piston. Said lateral guide forces lead to large
wear of the sealing device, which is arranged on the compressor
piston, whereby the compressor encompasses a large amount of
maintenance and thus high construction costs. The lateral guide
forces can be reduced by extending the piston rod, whereby,
however, the compressor also requires a Large amount of space in
radial direction.
[0004] The instant invention is based on the object of providing a
compressor of the afore-mentioned species, which requires a small
amount of space and low construction costs.
[0005] According to the invention this object is solved in that the
compressor is embodied as an oscillating piston-type compressor,
wherein the first compressor piston is arranged on an eccentric
ring, which is effectively connected to the eccentric shaft and in
that the second compressor piston is fastened to a pivot lug, which
is effectively connected to the eccentric ring. Due to the design
of the compressor as an oscillating piston-type compressor, wherein
the second compressor piston is connected to a pivot lug, which is
connected to the eccentric ring, which is effectively connected to
the eccentric shaft, wherein the first compressor piston is
fastened to the eccentric ring, it is possible to make the design
of a compressor comprising two compressor pistons to be simple and
to be space-saving in axial and radial direction. Due to the
embodiment of the compressor as an oscillating piston-type
compressor, the compressor also encompasses very low lateral guide
forces due to the fact that piston rods are not being used, whereby
the compressor encompasses a long service life with a small amount
of maintenance and thus low construction costs.
[0006] According to a preferred embodiment of the invention, a
fastening lug, to which the first compressor piston is fastened, is
embodied on the eccentric ring, wherein the pivot lug of the second
compressor piston is arranged on the eccentric ring in an
articulated manner in the area of the fastening lug of the first
compressor piston. This articulated arrangement of the pivot lug on
the eccentric ring makes it possible for the pendular motion and
thus for the deflection of the second compressor piston to be less
than the pendular motion and thus the deflection of the first
compressor piston, wherein the lateral guide forces of the second
compressor piston can be further reduced.
[0007] Low construction costs can be attained when the pivot lug is
embodied according to a preferred embodiment of the invention as a
bow-shaped component, which encompasses a cross-plate, to which the
second compressor piston is fastened and two substantially
ring-shaped side parts, which are spaced apart from one another,
wherein a receiving space for the eccentric ring is embodied
between the side parts. As a result of this, it is possible to
arrange the first compressor piston and the second compressor
piston in one plane in a simple manner and to thus attain a small
space requirement of the compressor in axial direction.
[0008] Advantageously, a receiving bore for a hinge pin is embodied
on the side parts. An articulated connection of the pivot lug,
which is embodied in a bow-shaped manner, to the eccentric ring can
he attained in a simple manner by means of a hinge pin, which is
arranged and fastened in the receiving bore of the side parts of
the pivot lug.
[0009] Provided that a through hole for the hinge pin is embodied
on the eccentric ring, the hinge pin can be arranged in the
eccentric ring in a simple manner and with low construction
costs.
[0010] Particular advantages result when the hinge pin is supported
in the through hole of the eccentric ring by means of a bush. Using
a bush, in particular a plain bearing bush, it is possible to
attain an articulated bearing of the pivot lug on the eccentric
ring with a long service life with a small amount of maintenance in
a simple manner by means of the hinge pin, which is fastened in the
pivot lug.
[0011] According to an advantageous embodiment of the invention,
the compressor is embodied as a two-stage compressor, wherein the
first compressor piston forms the input stage and the second
compressor piston forms the output stage of the compressor. With a
compressor according to the invention, which is an oscillating
piston-type compressor comprising two compressor pistons, provision
can be made for a two-stage compressor, which requires a small
amount of space and low construction costs. In the input stage, the
gaseous medium and/or the cryogenically liquefied media, which can
have an input temperature of up to -250.degree. C., can hereby be
compressed to an intermediate pressure of, for example, 10-15 bar,
wherein an operating pressure of, for example, up to 450 bar can be
generated in the output stage as a function of the area ratio of
the first and the second compressor piston and thus as a function
of the stage pressure ratio.
[0012] Advantageously, the first compressor piston is arranged in a
first compressor cylinder and the second compressor piston is
arranged in a second compressor cylinder, wherein the output of the
first compressor cylinder is connected to the input of the second
compressor cylinder. Due to the arrangement of the compressor
pistons as being substantially opposite, wherein the compressor
pistons are arranged so as to be offset by 180.degree. relative to
the eccentric shaft in response to an arrangement of the compressor
pistons as being opposite and thus operate in a phase-shifted
manner, the output of the first compressor piston can be directly
connected to the input of the second compressor piston, whereby a
two-stage compressor can be attained with low production costs.
Instead of an offset angle of 180.degree. of the first compressor
piston and of the second compressor piston, provision can be made
for different offset angles to improve the relative strengths and
the moment ratios.
[0013] Further advantages and details of the invention are defined
in more detail by means of the exemplary embodiment, which is
illustrated in the schematic figures.
[0014] FIG. 1 shows a compressor according to the invention in a
perspective illustration,
[0015] FIG. 2 shows a detailed view of FIG. 1,
[0016] FIG. 3 shows a side view of FIG. 2 and
[0017] FIG. 4 shows a top view of FIG. 2.
[0018] The perspective view of a compressor 1 according to the
invention as an oscillating piston-type compressor is illustrated
in FIG. 1.
[0019] The compressor 1 is embodied as a two-stage compressor and
encompasses a ring-shaped housing 15, in which a first compressor
cylinder 16, which forms the input stage, and a second compressor
cylinder 17, which forms the output stage, is fastened. A cylinder
head 18, 19, which forms the input as well as the output of the
compressor cylinders 16, 17, is arranged in each case on the
compressor cylinders 16, 17. On the input side, the cylinder head
18 is connected to an input line 20 for the gaseous medium, which
is to be compressed. At the output side, an intermediate line 21,
which guides the medium, which is compressed to the intermediate
pressure by the input stage and which is guided to the input of the
cylinder head 19, is connected to the cylinder head 18. At the
output side, the cylinder head 19 is connected to an output line 22
for the medium, which is compressed to the operating pressure. A
connection 23 for a safety valve, for example a pressure control
valve, is embodied in the intermediate line 21.
[0020] As is shown in FIGS. 2 to 4, the compressor 1 encompasses an
eccentric shaft 2, which is operatively connected to a crankshaft
24 illustrated in FIG. 1, which is rotatably mounted about an axis
of rotation D. An eccentric ring 4 is fastened to said eccentric
shaft 2 by means of a rolling bearing 3.
[0021] A fastening lug 5 is embodied on the eccentric ring 4. A
first compressor piston 6, which is arranged in the first
compressor cylinder 16, is fastened to said fastening lug 5. As can
be seen in FIG. 3, a threaded hole 5a, for example, is embodied on
the fastening lug 5 for this purpose, wherein the first compressor
piston 6 is fastened in the fastening lug 5 by means of a screw
connection. The first compressor piston 6 is provided with a
groove-shaped recess 6a, in which a sealing device can be arranged.
In response to a rotation of the crankshaft 24, the first
compressor piston 6, which is connected to the crankshaft 24 via
the eccentric ring 4 and the eccentric shaft 2, performs a pendular
motion in the compressor cylinder 16.
[0022] The compressor 1 encompasses a second compressor piston 7,
which is arranged in the compressor cylinder 17 and which is
arranged so as to be offset by 180.degree. and thus so as to be
located opposite to the first compressor piston 6 relative to the
eccentric shaft 2 and thus relative to the crankshaft 24 in the
illustrated exemplary embodiment.
[0023] As can be seen from FIGS. 2 to 4, the second compressor
piston 7 is fastened to a pivot lug 8, on which the eccentric ring
4 is fastened in an articulated manner about a pivot axis S, which
is arranged parallel to the axis of rotation D, in the area of the
fastening lug 5 of the first compressor piston 6. The second
compressor piston 7 is provided with at least one groove-shaped
recess 7a, in which a sealing device can be arranged.
[0024] The pivot lug 8 is embodied as a bow-shaped component
comprising a cross-plate 8a and side parts 8b, 8c, which are
arranged on the cross-plate 8a. The side parts 8b, 8c are hereby
integrally molded on the cross-plate 8a in one piece. The second
compressor piston 7 is fastened to the cross-plate 8a. For this
purpose, a threaded hole 8d, into which the second compressor
piston 7 can be screwed, is embodied in the cross-plate 8a, for
example.
[0025] The side parts 8b, 8c are embodied in a substantially
ring-shaped manner and are spaced apart from one another in axial
direction of the axis of rotation D, whereby a receiving space for
the eccentric ring 4 is formed between the side parts 8b, 8c. A
receiving bore 10, which forms the pivot axis S, is embodied on the
side parts 8b, 8c in the area located opposite to the cross-plate
8a. Said receiving bore 10 is formed, for example, by a through
hole in the side part 8b and by a threaded hole in the side part
8c. A hinge pin 11 is arranged and screwed into the receiving bore
10.
[0026] A through hole 12 is embodied on the eccentric ring 4 in the
area of the fastening lug 5, by means of which the hinge pin 11 and
thus the pivot lug 8 is connected to the eccentric ring 4. A bush
13, for example a plain bearing bush, can be arranged between the
through hole 12 and the hinge pin 11.
[0027] Due to the articulated fastening of the pivot lug 8 of the
second compressor piston 7, which is formed by the hinge pin 11, on
the eccentric pin 4 in the area of the fastening lug 5 of the first
compressor piston 6, an arrangement of the first compressor piston
6 so as to be located opposite relative to the axis of rotation D
and of the second compressor piston 7 in a plane, which is
perpendicular to the axis of rotation D, can be formed in a simple
manner. This leads to a space-saving design of the compressor 1
according to the invention in axial direction. The embodiment of
the compressor 1 as an oscillating piston-type compressor
comprising two compressor pistons 6, 7, wherein a reduced pendular
motion and a reduced deflection of the second compressor piston 7
is attained by pivoting the pivot lug 8, which is provided with the
second compressor piston 7, to the fastening lug 5 of the first
compressor piston 6, furthermore leads to a space-saving design of
the compressor in radial direction, wherein, furthermore, very
small lateral guide forces appear on the compressor pistons 6, 7
and the compressor according to the invention thus encompasses a
small amount of maintenance and thus low construction costs.
* * * * *