EP1702162B1 - Piston compressor for compressing gaseous media in at least two working chambers - Google Patents

Piston compressor for compressing gaseous media in at least two working chambers Download PDF

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Publication number
EP1702162B1
EP1702162B1 EP04803681A EP04803681A EP1702162B1 EP 1702162 B1 EP1702162 B1 EP 1702162B1 EP 04803681 A EP04803681 A EP 04803681A EP 04803681 A EP04803681 A EP 04803681A EP 1702162 B1 EP1702162 B1 EP 1702162B1
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EP
European Patent Office
Prior art keywords
piston
valves
piston portion
cylinder
stepped
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EP04803681A
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German (de)
French (fr)
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EP1702162A1 (en
Inventor
Beat Frefel
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Fritz Haug AG
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Fritz Haug AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B5/00—Machines or pumps with differential-surface pistons
    • F04B5/02—Machines or pumps with differential-surface pistons with double-acting pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B25/00—Multi-stage pumps
    • F04B25/02—Multi-stage pumps of stepped piston type

Definitions

  • the invention relates to a reciprocating compressor for compressing gaseous media in at least two working spaces with the features of the independent claim.
  • the CH 123787 relates to a double-acting pump with a stepped piston, which is drivable via a piston rod.
  • the stepped piston has a front, annular piston part and a connected to the piston rod second piston part.
  • the two piston parts are interconnected by a tubular connector.
  • the stepped piston is mounted in a one-piece housing part, which is closed by a lid.
  • the lid has an inwardly directed cylindrical hollow insert which extends into the connector.
  • This double-acting pump which can also be used as a compressor, has annular and cylindrical working chambers, on the end faces of which valve arrangements are respectively arranged.
  • a reciprocating compressor for refrigerators has become known in which a coolant in two opposite Work spaces is compacted in push-pull.
  • One of the two work spaces is closed by a cylinder head, through which a piston rod is carried out for reciprocating the piston.
  • a plate with valve assemblies is arranged, which closes the second working space.
  • the compressor has a "flash gas" injection assembly extending from this side into a bore.
  • the US 4,368,008 relates to a reciprocating compressor with a free-floating piston mounted therein, which is hydraulically driven.
  • the compressor far on its outer sides plate-like cylinder heads with valve arrangements, which close a cylindrical working space.
  • an internal annular working space is provided, which is closed at the end by a flange.
  • the flange element has a direction perpendicular to the direction of movement portion with a valve assembly.
  • a piston compressor is shown with a floating piston, which is hydraulically driven.
  • the piston consists of two annular piston parts and a piston part arranged between them, which is connected by cylindrical pipe pieces with the annular piston parts.
  • fixed piston elements are arranged on which the tube elements of the piston are slidably mounted and each define a cylindrical working space.
  • the fixed piston in this case has a valve arrangement which is arranged on the lateral surface outside of the compressor housing. Furthermore, on the two opposite outer sides of the compressor Plates provided with valve assemblies, each of which closed an outer annular working space.
  • a compressor of the type mentioned which is characterized by a simple and inexpensive manufacturability and at the same time by good performance data.
  • an easy assembly in modular design should be possible.
  • the compressor should continue to have a long life.
  • this object is achieved with a reciprocating compressor having the features of the independent claim.
  • a piston compressor for compressing gaseous media has a stepped piston with a first piston part and at least one second coaxially arranged piston part.
  • the reciprocating compressor has a first cylinder with an internal bore for receiving the first piston member to form a piston first workspace.
  • the second cylinder also has an inner bore for receiving the second piston part to form a second working space.
  • the second piston part has a smaller diameter than the first piston part.
  • Each of the at least two cylinders is closed by a plate having valve arrangements, the second piston part having the smaller diameter being guided through an opening in one of the plates with valve arrangements.
  • the stepped piston is reciprocable in the compressor, whereby gaseous medium is sucked in and then compressed.
  • a working space is annular (annular gap) is formed while the other working space is cylindrical.
  • the strokes of the stepped piston can be done for example via a connecting rod system with a drive via a crank mechanism.
  • the stepped piston is connected via a piston rod or a guide piston to the drive.
  • the stepped piston could thus be constructed on a crosshead of a compressor engine.
  • the plates with valve arrangements close the cylinders and serve for inlet and outlet control of the gaseous medium to be compressed.
  • Such a valve arrangement has several advantages.
  • the plates with the valve assemblies can be easily assembled and disassembled.
  • a modular design is also made possible because the necessary valves can be easily mounted on the plates.
  • the advantages of this design lies in the good utilization of the cylinder cross section and the valve plates moving without friction. The dead space, the wear and the flow losses are therefore low in this valve assembly and it is therefore particularly suitable for smaller and high-speed compressors.
  • the first piston part is arranged at one end of the second piston part.
  • the piston part with the larger diameter thus forms the front end of the stepped piston.
  • the first piston part forms a cylindrical working space and the second smaller piston part forms an annular working space.
  • the piston parts and the two cylinders are thus arranged so that compression takes place in push-pull.
  • the gaseous medium is compressed in one direction of movement in each case in one working space and drawn in the other working space (and vice versa).
  • the second piston part is arranged at the end of the first piston part.
  • the second piston part whose diameter is smaller than the diameter of the first piston part, forms the front end of the stepped piston.
  • the second smaller piston part forms a cylindrical working space and the first larger piston part forms an annular working space.
  • the piston parts and the two cylinders are arranged so that a compression takes place in the "same cycle". In this arrangement, one direction of movement is equally effective for both working spaces. A compression thus takes place simultaneously in the two workspaces.
  • the compression takes place in two stages. In a first stage, compression takes place via the annular gap (formed by the second working space).
  • the compression in the second Stage takes place via the piston surface of the second piston part, which forms the front end of the stepped piston.
  • the piston parts are each preferably sealed by means of piston rings relative to the inner bore of the cylinder parts.
  • the advantage of this embodiment is that the losses escape via the piston rings from the second stage in the first stage and do not reach the outside. As a result, gas losses can be significantly minimized. Furthermore, the loads on the piston rings are lowered.
  • the diameter of the second smaller piston part is chosen in comparison to the diameter of the first larger piston part such that the annular gap volume of the first stage has a three to four times as large volume as the working space at the front end of the stepped piston.
  • the plates are disc-shaped and limit the working space on the front side, whereby the working spaces are closed in a simple manner. This also allows a simple and compact design of compressors.
  • the plates with valve arrangements have at least one inlet valve and at least one outlet valve. This ensures that in each case air or other gaseous media is sucked in via an inlet valve in one direction of movement and in the opposite movement the compressed air is expelled via the outlet valves.
  • the plates to drill holes for the valve assemblies. At these holes, the corresponding valves can be arranged. Such holes can be done with little effort on the plates, which are preferably made of metal such as steel or aluminum, are introduced.
  • the intake valves and exhaust valves are designed as multi-disk valves, as reed valves, or as individual valves with spring return.
  • a lamella closes (respectively opens) the passage through a respective bore for the passage of the media.
  • a tongue closes (opens respectively) the passage through a plurality of holes for the passage of the media at the same time.
  • a single valve closes (opens respectively) the passage through one or more holes for the passage of the media.
  • Such valves are particularly suitable for use in a compression unit with small displacement. These valve types are characterized by the fact that they are simple and inexpensive to manufacture or to obtain. Also, they can be easily arranged in the plate.
  • the plates are sealed against the cylinder parts by seals, such as gaskets, O-ring seal or possibly metallic seals.
  • FIG. 1 shows a piston compressor designated by 15 with a stepped piston 1.
  • the stepped piston 1 consists of two piston parts: a first piston part 16 and a second piston part 17.
  • the pistons are, of course, arranged symmetrically and coaxially in an axis A.
  • the stepped piston 1 can move in the x-direction along the axis A back and forth.
  • the first piston part 16, which defines the front end of the stepped piston is arranged in a first cylinder 7.
  • the diameter of the first piston part 16 is larger than the diameter of the second piston part 17.
  • Above a piston surface 30 of the first cylinder 7 is a working space 21 formed by the first cylinder 7, closed by the valve plate 9.
  • Another working space 22 is in the region of second cylinder 8 and the second piston part 17 is arranged. This working space 22 is obviously designed annular.
  • the compressor 15 further has a cylinder head 29.
  • the plate 9 is located between the cylinder head 29 and the first cylinder 7.
  • the other plate 9 with the valve arrangements, which closes the annular gap or working space 22, is arranged between the first cylinder 7 and the second cylinder 8.
  • the plate 2 has a circular opening 20, the diameter of which preferably corresponds to the diameter of the inner bore 19 of the second cylinder 8.
  • the opening 20 can also be designed such that a seal with the piston part 17 is present.
  • At least one inlet valve 3 or 13 and one outlet valve 4 or 14 are respectively arranged on the plates 2 and 9.
  • the intake valves 3 and 13 as well as the exhaust valves 4 and 14 are designed as lamella valves 31.
  • the piston parts 16 and 17 have on their lateral surfaces piston rings 5 for sealing the respective working spaces 21 and 22, respectively.
  • the front piston member 16 further comprises guide elements 6, on the one hand to increase the stability of the stepped piston 1 and on the other hand to minimize the distance between the stepped piston 1 and the cylinder (here only the cylinder part 7). Thereby, the efficiency of the reciprocating compressor 15 can be improved.
  • the stepped piston 1 compresses, for example, during the downward movement in the x direction, a gaseous medium, in particular air, wherein the compressed medium can be ejected via the outlet valve 14. With the same downward movement, the gaseous medium is sucked into the first working space 21. If the stepped piston 1 moves in the opposite direction, the process is reversed.
  • the arrows shown in Figure 1 illustrate the inflowing or outflowing air-In FIG. 2 shows an alternative embodiment of a reciprocating compressor 15.
  • This reciprocating compressor 15 compresses air or other gaseous media in a common mode.
  • a stepped piston 1 is moved forwards, that is to say in the direction of the cylinder head 29, then the air in the working spaces 21 and 22 is compressed. If the pressure in the working spaces exceeds a certain level, the compressed air escapes via the respective outlet valves 4 or 14.
  • the compaction takes place in two stages. In a first stage, the medium is compressed via the annular gap 28 in the lower working space 21. In the second stage, the medium in the front working chamber 22 is compressed via the piston surface 30 of the front piston 17. Due to the relatively small piston surface 30 higher end pressures can be achieved here.
  • the arrangement is characterized inter alia by the fact that the losses escape via the piston rings 5 from the second stage in the first stage and thus not reach the outside. Thus, gas losses can be significantly minimized. Furthermore, the loads on the piston rings 5 are minimized because, due to the high support pressure in the lower working space 21, the differential pressure acting on the piston rings 5 with respect to the front working space 22 is smaller.
  • the second piston part 16 has in addition to piston rings 5 on additionalêtslemente 6. Depending on the dimensions and purpose of several such sealing elements and / or guide elements can be arranged.
  • a stepped piston 1 is moved by an oscillating drive, for example via a crank mechanism.
  • the stepped piston 1 is preferably connected via a piston rod to the drive.
  • the leadership of the stepped piston 1 can be done in particular by a crosshead (also not shown).
  • FIG. 3 shows a section through an upper plate 9 with the representation of an inlet valve 3 in the embodiment as a lamella valve 31.
  • a bore 23 in the form of a through bore is provided in the plate 9, which is covered by a respective lamella .
  • the lamella valves 31 are mounted eccentrically. At least one lamella each as inlet and outlet valve is to be provided in total. The number of slats depends mainly on the size and the intended performance data.
  • the piston parts 16 and 17 must have recesses at locations where components of the valves 3 and 4 protrude into the displacement.
  • the position of the stepped piston 1 about the longitudinal axis A must be fixed.
  • the intake valves 3 and exhaust valves 4 may be designed according to the embodiment with multi-disc valves 31 each as a reed valve, in which case a tongue would cover a plurality of holes 23 simultaneously (not shown).
  • FIG. 4 shows, by way of example, a valve arrangement on a plate 9, which analogously also applies to the valve arrangement of the plate 2 of the annular gap 28.
  • the valves 3 and 4 are designed as individual valves with spring return 33, which are arranged centrally above the holes 23.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention relates to a piston compressor (15) which is used to compress gaseous media and which contains a differential piston (1) provided with a first piston part (16) and a second piston part (17) which are arranged on an axis. Two cylinders (7, 8) having internal holes with different diameters form two working chambers (21, 22). The cylinders are closed by plates (2, 9) comprising valve arrangements. The piston part (17) with the smaller diameter is guided through an opening (20) in the plate (2). The valves are more particularly lamella valves, reed valves or values with a spring return position.

Description

Die Erfindung betrifft einen Kolbenkompressor zum Verdichten gasförmiger Medien in wenigstens zwei Arbeitsräumen mit den Merkmalen des unabhängigen Anspruchs.The invention relates to a reciprocating compressor for compressing gaseous media in at least two working spaces with the features of the independent claim.

Es sind bereits zahlreiche Kolbenkompressoren mit mehreren Arbeitsräumen bekannt und gebräuchlich. So beschreibt beispielsweise die US 4 889 039 einen Kolbenkompressor, in welchem die Ventile jeweils im Zylindermantel angeordnet sind. Solche Kompressoren sind verhältnismässig aufwendig herzustellen und entsprechend teuer. Ein wesentlicher Nachteil einer Ventilanordnung im Zylindermantel sind die relativ grossen Schadraumvolumen, welche speziell bei kleineren Kompressoren mit kleinen Hubvolumen einen schlechten Verdichtungswirkungsgrad verursachen.There are already numerous reciprocating compressors with several working spaces known and in use. For example, describes the US 4,889,039 a piston compressor, in which the valves are each arranged in the cylinder jacket. Such compressors are relatively expensive to produce and correspondingly expensive. A major disadvantage of a valve arrangement in the cylinder jacket are the relatively large dead space volumes, which cause a poor compression efficiency especially for smaller compressors with small displacement.

Die CH 123787 betrifft eine doppelwirkende Pumpe mit einem Stufenkolben, der über eine Kolbenstange antreibbar ist. Der Stufenkolben verfügt über ein vorderes, ringförmiges Kolbenteil und über ein mit der Kolbenstange verbundenes zweites Kolbenteil. Die beiden Kolbenteile sind durch ein rohrförmiges Verbindungsstück miteinander verbunden. Der Stufenkolben ist in einem einteiligen Gehäuseteil gelagert, das durch einen Deckel verschlossen ist. Der Deckel verfügt über einen nach innen gerichteten zylinderförmigen hohlen Einsatz, der sich in das Verbindungsstück erstreckt. Diese auch als Verdichter verwendbare doppelt wirkende Pumpe weist ringförmige und zylindrische Arbeitsräume auf, an deren Stirnseiten jeweils Ventilanordnungen angeordnet sind.The CH 123787 relates to a double-acting pump with a stepped piston, which is drivable via a piston rod. The stepped piston has a front, annular piston part and a connected to the piston rod second piston part. The two piston parts are interconnected by a tubular connector. The stepped piston is mounted in a one-piece housing part, which is closed by a lid. The lid has an inwardly directed cylindrical hollow insert which extends into the connector. This double-acting pump, which can also be used as a compressor, has annular and cylindrical working chambers, on the end faces of which valve arrangements are respectively arranged.

Aus der US 4,369,633 ist ein Kolbenkompressor für Kühlgeräte bekannt geworden, bei welchem ein Kühlmittel in zwei einander gegenüberliegenden Arbeitsräumen im Gegentakt verdichtet wird. Einer der beiden Arbeitsräume ist dabei durch einen Zylinderkopf verschlossen, durch den eine Kolbenstange zum Hinundherbewegen des Kolbens durchgeführt ist. An der dem Zylinderkopf gegenüberliegenden Seite des Kolbenkompressors ist eine Platte mit Ventilanordnungen angeordnet, die den zweiten Arbeitsraum verschliesst. Weiter verfügt der Kompressor über eine "Flash Gas"-Injektionsanordnung, die sich von dieser Seite her in eine Bohrung erstreckt.From the US 4,369,633 a reciprocating compressor for refrigerators has become known in which a coolant in two opposite Work spaces is compacted in push-pull. One of the two work spaces is closed by a cylinder head, through which a piston rod is carried out for reciprocating the piston. On the opposite side of the cylinder head of the piston compressor, a plate with valve assemblies is arranged, which closes the second working space. Further, the compressor has a "flash gas" injection assembly extending from this side into a bore.

Die US 4,368,008 betrifft einen Kolbenkompressor mit einem darin frei schwimmend gelagerten Kolben, der hydraulisch antreibbar ist. Der Kompressor weit an seinen Aussenseiten plattenartige Zylinderköpfe mit Ventilanordnungen auf, die einen zylindrischen Arbeitsraum verschliessen. Je Bewegungsrichtung ist ein innenleigender ringförmiger Arbeitsraum vorgesehen, der stirnseitig durch ein Flanschelement verschlossen ist. Das Flanschelement weist dabei einen zur Bewegungsrichtung senkrecht verlaufenden Abschnitt mit einer Ventilanordnung auf.The US 4,368,008 relates to a reciprocating compressor with a free-floating piston mounted therein, which is hydraulically driven. The compressor far on its outer sides plate-like cylinder heads with valve arrangements, which close a cylindrical working space. Depending on the direction of movement an internal annular working space is provided, which is closed at the end by a flange. The flange element has a direction perpendicular to the direction of movement portion with a valve assembly.

In der US 4,334,833 ist ein Kolbenkompressor mit einem schwimmend gelagerten Kolben gezeigt, der hydraulisch antreibbar ist. Der Kolben besteht aus zwei ringförmigen Kolbenteilen und einem dazwischen angeordneten Kolbenteil, das durch zylindrische Rohrstücke mit den ringförmigen Kolbenteilen verbunden ist. Jeweils seitlich sind am Kolbenkompressor nach innen sich erstreckende, feststehende Kolbenelemente angeordnet, auf welchen die Rohrelemente des Kolbens gleitend gelagert sind und die jeweils einen zylindrischen Arbeitsraum definieren. Der feststehende Kolben weist dabei eine Ventilanordnung auf, die auf dessen Mantelfläche ausserhalb des Kompressorgehäuses angeordnet ist. Weiters sind an den beiden gegenüberliegenden Aussenseiten des Kompressors Platten mit Ventilanordnungen vorgesehen, die jeweils einen äusseren ringförmigen Arbeitsraum verschliessen.In the US 4,334,833 a piston compressor is shown with a floating piston, which is hydraulically driven. The piston consists of two annular piston parts and a piston part arranged between them, which is connected by cylindrical pipe pieces with the annular piston parts. In each case laterally extending on the piston compressor, fixed piston elements are arranged on which the tube elements of the piston are slidably mounted and each define a cylindrical working space. The fixed piston in this case has a valve arrangement which is arranged on the lateral surface outside of the compressor housing. Furthermore, on the two opposite outer sides of the compressor Plates provided with valve assemblies, each of which closed an outer annular working space.

Es ist deshalb eine Aufgabe der vorliegenden Erfindung, die Nachteile des Bekannten zu vermeiden, insbesondere einen Kompressor der eingangs genannten Art zu schaffen, welcher sich durch eine einfache und günstige Herstellbarkeit und zugleich durch gute Leistungsdaten auszeichnet. Insbesondere soll eine leichte Montage in Modulbauweise möglich sein. Der Kompressor soll weiter eine lange Lebensdauer aufweisen.It is therefore an object of the present invention to avoid the disadvantages of the known, in particular to provide a compressor of the type mentioned, which is characterized by a simple and inexpensive manufacturability and at the same time by good performance data. In particular, an easy assembly in modular design should be possible. The compressor should continue to have a long life.

Erfindungsgemäss werden diese Aufgabe mit einem Kolbenkompressor mit den Merkmalen des unabhängigen Anspruchs gelöst.According to the invention, this object is achieved with a reciprocating compressor having the features of the independent claim.

Ein Kolbenkompressor zum Verdichten gasförmiger Medien weist einen Stufenkolben mit einem ersten Kolbenteil und wenigstens einen zweiten koaxial angeordneten Kolbenteil auf. Der Kolbenkompressor verfügt über einen ersten Zylinder mit einer inneren Bohrung zur Aufnahme des ersten Kolbenteils zur Bildung eines ersten Arbeitsraumes auf. Der zweite Zylinder verfügt ebenfalls eine innere Bohrung zur Aufnahme des zweiten Kolbenteils zur Bildung eines zweiten Arbeitsraumes. Dabei weist der zweite Kolbenteil einen kleineren Durchmesser als der ersten Kolbenteil auf. Jeder der wenigstens zwei Zylinder ist durch eine Platte mit Ventilanordnungen verschlossen, wobei der zweite Kolbenteil mit dem kleineren Durchmesser durch eine Öffnung in einer der Platten mit Ventilanordnungen geführt ist. Der Stufenkolben ist im Kompressor hin- und her beweglich, wodurch gasförmiges Medium angesaugt und dann verdichtet wird. Mit Hilfe des Stufenkolbens ist eine Verdichtung in wenigstens zwei getrennten Arbeitsräumen möglich. Ein Arbeitsraum ist dabei ringförmig (Ringspalt) ausgebildet, während der andere Arbeitsraum zylindrisch ausgebildet ist. Die Hubbewegungen des Stufenkolbens können beispielsweise über ein Pleuelsystem mit einem Antrieb über einen Kurbeltrieb erfolgen. Dazu ist der Stufenkolben über eine Kolbenstange oder einen Führungskolben mit dem Antrieb verbunden. Insbesondere könnte der Stufenkolben also auf einem Kreuzkopf eines Kompressortriebwerks aufgebaut sein.A piston compressor for compressing gaseous media has a stepped piston with a first piston part and at least one second coaxially arranged piston part. The reciprocating compressor has a first cylinder with an internal bore for receiving the first piston member to form a piston first workspace. The second cylinder also has an inner bore for receiving the second piston part to form a second working space. In this case, the second piston part has a smaller diameter than the first piston part. Each of the at least two cylinders is closed by a plate having valve arrangements, the second piston part having the smaller diameter being guided through an opening in one of the plates with valve arrangements. The stepped piston is reciprocable in the compressor, whereby gaseous medium is sucked in and then compressed. With the help of the stepped piston, a compression in at least two separate work spaces is possible. A working space is annular (annular gap) is formed while the other working space is cylindrical. The strokes of the stepped piston can be done for example via a connecting rod system with a drive via a crank mechanism. For this purpose, the stepped piston is connected via a piston rod or a guide piston to the drive. In particular, the stepped piston could thus be constructed on a crosshead of a compressor engine.

Die Platten mit Ventilanordnungen verschliessen die Zylinder und dienen zur Ein- und Auslasssteuerung des zu verdichtenden gasförmigen Mediums. Eine solche Ventilanordnung hat verschiedene Vorteile. So können die Platten mit den Ventilanordnungen einfach montiert und demontiert werden. Eine Modulbauweise wird dadurch ebenfalls ermöglicht, da die notwendigen Ventile auf einfache Art und Weise auf die Platten angebracht werden können. Der Vorteile dieser Bauart liegt in der guten Ausnützung des Zylinderquerschnittes und der sich reibungsfrei bewegenden Ventilplatten. Der Schadraum, die Abnutzung und die Strömungsverluste sind daher bei dieser Ventilanordnung gering und sie eignet sich daher besonders für kleinere und schnelllaufende Kompressoren.The plates with valve arrangements close the cylinders and serve for inlet and outlet control of the gaseous medium to be compressed. Such a valve arrangement has several advantages. Thus, the plates with the valve assemblies can be easily assembled and disassembled. A modular design is also made possible because the necessary valves can be easily mounted on the plates. The advantages of this design lies in the good utilization of the cylinder cross section and the valve plates moving without friction. The dead space, the wear and the flow losses are therefore low in this valve assembly and it is therefore particularly suitable for smaller and high-speed compressors.

In einer möglichen Ausführungsform, die aber nicht von Erfindungsgegenstand erfasst ist, ist der erste Kolbenteil an einem Ende des zweiten Kolbenteils angeordnet. Das Kolbenteil mit dem grösseren Durchmesser bildet damit das vordere Ende des Stufenkolbens. Der erste Kolbenteil bildet einen zylindrischen Arbeitsraum und der zweite kleinere Kolbenteil bildet einen ringförmigen Arbeitsraum. Die Kolbenteile und die beiden Zylinder sind damit derart angeordnet, dass eine Kompression im Gegentakt erfolgt . Das gasförmige Medium wird in einer Bewegungsrichtung jeweils in einem Arbeitsraum verdichtet und im anderen Arbeitsraum angesaugt (und umgekehrt).In a possible embodiment, which is not covered by the subject invention, the first piston part is arranged at one end of the second piston part. The piston part with the larger diameter thus forms the front end of the stepped piston. The first piston part forms a cylindrical working space and the second smaller piston part forms an annular working space. The piston parts and the two cylinders are thus arranged so that compression takes place in push-pull. The gaseous medium is compressed in one direction of movement in each case in one working space and drawn in the other working space (and vice versa).

Da sich die Gaskräfte, die einerseits auf die ganze Kolbenfläche und andererseits nur auf den Ringspalt wirken, in den Arbeitsräumen teilweise aufheben, findet eine Entlastung der Kräfte auf den Antrieb statt. Ein weiterer Effekt dieser Anordnung ist ein ausgeglichener Drehmomentverlauf und damit eine bessere Laufruhe.Since the gas forces, which act on the one hand on the entire piston surface and on the other hand only on the annular gap, partially cancel in the work areas, takes place a relief of the forces on the drive. Another effect of this arrangement is a balanced torque curve and thus better smoothness.

Erfindungsgemäss wird der zweite Kolbenteil am Ende des ersten Kolbenteils angeordnet. Damit bildet der zweite Kolbenteil, dessen Durchmesser kleiner als der Durchmesser des ersten Kolbenteils ist, das vordere Ende des Stufenkolbens. Der zweite kleinere Kolbenteil bildet einen zylindrischen Arbeitsraum und der erste grössere Kolbenteil bildet einen ringförmigen Arbeitsraum. Die Kolbenteile und die beiden Zylinder sind derart angeordnet, dass eine Kompression im "gleichen Takt" erfolgt. In dieser Anordnung ist jeweils eine Bewegungsrichtung gleichwirkend für beide Arbeitsräume. Eine Verdichtung findet also in den beiden Arbeitsräumen gleichzeitig statt. Die Verdichtung findet jedoch in zwei Stufen statt. In einer ersten Stufe erfolgt eine Verdichtung über den (durch den zweiten Arbeitsraum gebildeten) Ringspalt. Die Verdichtung in der zweiten Stufe erfolgt über die Kolbenfläche des zweiten Kolbenteils, welcher das vordere Ende des Stufenkolbens bildet.According to the invention, the second piston part is arranged at the end of the first piston part. Thus, the second piston part, whose diameter is smaller than the diameter of the first piston part, forms the front end of the stepped piston. The second smaller piston part forms a cylindrical working space and the first larger piston part forms an annular working space. The piston parts and the two cylinders are arranged so that a compression takes place in the "same cycle". In this arrangement, one direction of movement is equally effective for both working spaces. A compression thus takes place simultaneously in the two workspaces. The compression takes place in two stages. In a first stage, compression takes place via the annular gap (formed by the second working space). The compression in the second Stage takes place via the piston surface of the second piston part, which forms the front end of the stepped piston.

Die Kolbenteile sind jeweils bevorzugt mittels Kolbenringen gegenüber der inneren Bohrung der Zylinderteile abgedichtet. Der Vorteil dieser Ausführungsform liegt darin, dass die Verluste über die Kolbenringe aus der zweiten Stufe in die erste Stufe austreten und nicht ins Freie gelangen. Dadurch können Gasverluste erheblich minimiert werden. Im Weiteren werden die Belastungen auf die Kolbenringe gesenkt.The piston parts are each preferably sealed by means of piston rings relative to the inner bore of the cylinder parts. The advantage of this embodiment is that the losses escape via the piston rings from the second stage in the first stage and do not reach the outside. As a result, gas losses can be significantly minimized. Furthermore, the loads on the piston rings are lowered.

Vorzugsweise wird beispielsweise der Durchmesser des zweiten kleineren Kolbenteils im Vergleichs zum Durchmesser des ersten grösseren Kolbenteils derart gewählt, dass das Ringspaltvolumen der ersten Stufe ein drei bis vier Mal so grosses Volumen hat, wie der Arbeitsraum am vorderen Ende des Stufenkolbens.Preferably, for example, the diameter of the second smaller piston part is chosen in comparison to the diameter of the first larger piston part such that the annular gap volume of the first stage has a three to four times as large volume as the working space at the front end of the stepped piston.

Vorteilhaft ist es, wenn die Platten scheibenförmig ausgebildet sind und die Arbeitsräume stirnseitig begrenzen, wodurch auf einfache Art und Weise die Arbeitsräume verschlossen werden. Dadurch wird auch eine einfache und kompakte Bauweise von Kompressoren ermöglicht.It is advantageous if the plates are disc-shaped and limit the working space on the front side, whereby the working spaces are closed in a simple manner. This also allows a simple and compact design of compressors.

Vorteilhaft ist es, wenn die Platten mit Ventilanordnungen wenigstens ein Einlassventil und wenigstens ein Auslassventil verfügen. Damit wird sichergestellt, dass jeweils in einer Bewegungsrichtung Luft oder andere gasförmige Medien über ein Einlassventil angesaugt und bei der entgegengesetzten Bewegung die verdichtete Luft über die Auslassventile ausgestossen wird. Vorteilhaft weisen die Platten dazu Bohrungen für die Ventilanordnungen auf. An diesen Bohrungen können die entsprechenden Ventile angeordnet werden. Solche Bohrungen können mit geringem Aufwand auf die Platten, welche vorzugsweise aus Metall wie Stahl oder Aluminium bestehen, eingebracht werden.It is advantageous if the plates with valve arrangements have at least one inlet valve and at least one outlet valve. This ensures that in each case air or other gaseous media is sucked in via an inlet valve in one direction of movement and in the opposite movement the compressed air is expelled via the outlet valves. Advantageously, the plates to drill holes for the valve assemblies. At these holes, the corresponding valves can be arranged. Such holes can be done with little effort on the plates, which are preferably made of metal such as steel or aluminum, are introduced.

Besonders vorteilhaft ist es, wenn die Einlassventile und Auslassventile als Lamellenventile, als Zungenventile, oder Einzelventile mit Federrückstellung ausgestaltet sind. Eine Lamelle verschliesst (respektive öffnet) den Durchgang durch jeweils eine Bohrung zur Durchführung der Medien. Eine Zunge verschliesst (respektive öffnet) den Durchgang durch jeweils mehrere Bohrungen zur Durchführung der Medien gleichzeitig. Ein Einzelventil verschliesst (respektive öffnet) den Durchgang durch jeweils eine Bohrung oder mehrerer Bohrungen zur Durchführung der Medien. Solche Ventile eignen sich besonders zum Einsatz in einer Kompressionseinheit mit kleinen Hubvolumen. Diese Ventiltypen zeichnen sich dadurch aus, dass sie einfach und günstig herzustellen oder zu beziehen sind. Auch können sie auf einfache Weise in der Platte angeordnet werden.It is particularly advantageous if the intake valves and exhaust valves are designed as multi-disk valves, as reed valves, or as individual valves with spring return. A lamella closes (respectively opens) the passage through a respective bore for the passage of the media. A tongue closes (opens respectively) the passage through a plurality of holes for the passage of the media at the same time. A single valve closes (opens respectively) the passage through one or more holes for the passage of the media. Such valves are particularly suitable for use in a compression unit with small displacement. These valve types are characterized by the fact that they are simple and inexpensive to manufacture or to obtain. Also, they can be easily arranged in the plate.

Die Platten werden gegenüber den Zylinderteilen durch Dichtungen, beispielsweise Flachdichtungen, O-Ring-Dichtung oder allenfalls metallische Dichtungen abgedichtet.The plates are sealed against the cylinder parts by seals, such as gaskets, O-ring seal or possibly metallic seals.

Weitere Einzelmerkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der Ausführungsbeispiele und aus den Zeichnungen. Es zeigen:

Figur 1:
Querschnitt durch einen Kolbenkompressor, der nicht vom Erfindungsgegenstand erfasst, ist,
Figur 2:
Querschnitt durch einen erfindungsgemässen Kolbenkompressor,
Figur 3:
vergrösserte Darstellung eines Schnittes durch den oberen Teil eines Kolbenkompressors mit Lamellenventilen und
Figur 4:
vergrösserte Darstellung eines TeilQuerschnittes durch einen weiteren Kolbenkompressor mit Ventilen, welche eine Federrückstellung aufweisen.
Further individual features and advantages of the invention will become apparent from the following description of the embodiments and from the drawings. Show it:
FIG. 1:
Cross section through a reciprocating compressor, not covered by the subject invention,
FIG. 2:
Cross section through a piston compressor according to the invention,
FIG. 3:
enlarged view of a section through the upper part of a reciprocating compressor with vane valves and
FIG. 4:
enlarged representation of a TeilCuerschnittes by another piston compressor with valves, which have a spring return.

In Figur 1 ist ein mit 15 bezeichneter Kolbenkompressor mit einem Stufenkolben 1 dargestellt. Der Stufenkolben 1 besteht aus zwei Kolbenteilen: einem ersten Kolbenteil 16 und einem zweiten Kolbenteil 17. Die Kolben sind selbstverständlich grundsätzlich symmetrisch und koaxial in einer Achse A angeordnet. Der Stufenkolben 1 kann sich in x-Richtung entlang der Achse A hin- und her bewegen. Der erste Kolbenteil 16, welcher das vordere Ende des Stufenkolbens definiert, ist in einem ersten Zylinder 7 angeordnet. Der Durchmesser des ersten Kolbenteils 16 ist grösser als der Durchmesser des zweiten Kolbenteils 17. Oberhalb einer Kolbenfläche 30 des ersten Zylinders 7 befindet sich ein durch den ersten Zylinder 7 gebildeter Arbeitsraum 21, abgeschlossen durch die Ventilplatte 9. Ein weiterer Arbeitsraum 22 ist im Bereich des zweiten Zylinders 8 und des zweiten Kolbenteils 17 angeordnet. Dieser Arbeitsraum 22 ist ersichtlicherweise ringförmig ausgestaltet.FIG. 1 shows a piston compressor designated by 15 with a stepped piston 1. The stepped piston 1 consists of two piston parts: a first piston part 16 and a second piston part 17. The pistons are, of course, arranged symmetrically and coaxially in an axis A. The stepped piston 1 can move in the x-direction along the axis A back and forth. The first piston part 16, which defines the front end of the stepped piston, is arranged in a first cylinder 7. The diameter of the first piston part 16 is larger than the diameter of the second piston part 17. Above a piston surface 30 of the first cylinder 7 is a working space 21 formed by the first cylinder 7, closed by the valve plate 9. Another working space 22 is in the region of second cylinder 8 and the second piston part 17 is arranged. This working space 22 is obviously designed annular.

In Figur 1 verfügt der Kompressor 15 weiter über einen Zylinderkopf 29. In diesem Fall befindet sich die Platte 9 zwischen dem Zylinderkopf 29 und dem ersten Zylinder 7. Allenfalls ist vorstellbar, auf den dargestellten Zylinderkopf 29 zu verzichten und nur eine Platte 2 mit Ventilanordnung als Abschluss des Zylinders 7 einzusetzen.In Figure 1, the compressor 15 further has a cylinder head 29. In this case, the plate 9 is located between the cylinder head 29 and the first cylinder 7. At best, it is conceivable to dispense with the illustrated cylinder head 29 and only a plate 2 with valve assembly as Insert the cylinder 7.

Die andere Platte 9 mit den Ventilanordnungen, welche den Ringspalt bzw. Arbeitsraum 22 verschliesst, ist zwischen dem ersten Zylinder 7 und dem zweiten Zylinder 8 angeordnet. Mittig weist die Platte 2 eine kreisförmige Öffnung 20 auf, dessen Durchmesser vorzugsweise dem Durchmesser der inneren Bohrung 19 des zweiten Zylinders 8 entspricht. Die Öffnung 20 kann aber auch derart ausgestaltet sein, dass eine Dichtung mit dem Kolbenteil 17 vorliegt. An den Platten 2 und 9 sind jeweils wenigstens ein Einlassventil 3 bzw. 13 und jeweils ein Auslassventil 4 bzw. 14 angeordnet. So sind beispielsweise in Figur 1 die Einlassventile 3 und 13 sowie die Auslassventile 4 und 14 als Lamellenventile 31 ausgestaltet. Selbstverständlich sind auch andere Ventilarten einsetzbar. Die Kolbenteile 16 und 17 weisen auf ihren Mantelflächen Kolbenringe 5 zum Abdichten der jeweiligen Arbeitsräume 21 bzw. 22 auf. Andere Abdichtungen wie Labyrinth-Dichtungen oder Stangenpackungen sind ebenfalls vorstellbar. Der vordere Kolbenteil 16 weist weiter Führungselemente 6 auf, um einerseits die Stabilität des Stufenkolbens 1 zu erhöhen und andererseits um den Abstand zwischen Stufenkolben 1 und des Zylinders (hier nur des Zylinderteils 7) zu minimieren. Dadurch kann der Wirkungsgrad des Kolbenkompressors 15 verbessert werden.The other plate 9 with the valve arrangements, which closes the annular gap or working space 22, is arranged between the first cylinder 7 and the second cylinder 8. In the middle, the plate 2 has a circular opening 20, the diameter of which preferably corresponds to the diameter of the inner bore 19 of the second cylinder 8. However, the opening 20 can also be designed such that a seal with the piston part 17 is present. At least one inlet valve 3 or 13 and one outlet valve 4 or 14 are respectively arranged on the plates 2 and 9. For example, in FIG. 1, the intake valves 3 and 13 as well as the exhaust valves 4 and 14 are designed as lamella valves 31. Of course, other types of valves can be used. The piston parts 16 and 17 have on their lateral surfaces piston rings 5 for sealing the respective working spaces 21 and 22, respectively. Other seals such as labyrinth seals or rod packs are also conceivable. The front piston member 16 further comprises guide elements 6, on the one hand to increase the stability of the stepped piston 1 and on the other hand to minimize the distance between the stepped piston 1 and the cylinder (here only the cylinder part 7). Thereby, the efficiency of the reciprocating compressor 15 can be improved.

Der Stufenkolben 1 verdichtet beispielsweise bei der Abwärtsbewegung in x-Richtung ein gasförmiges Medium, insbesondere Luft, wobei das verdichtete Medium über das Auslassventil 14 ausgestossen werden kann. Mit derselben Abwärtsbewegung wird in den ersten Arbeitsraum 21 das gasförmiges Medium angesaugt. Bewegt sich der Stufenkolben 1 in die umgekehrte Richtung, erfolgt der Prozess auf umgekehrte Weise. Die in Figur 1 dargestellten Pfeile veranschaulichen die einströmende bzw. ausströmende Luft-In Figur 2 wird eine alternative Ausführung eines Kolbenkompressors 15 gezeigt. Dieser Kolbenkompressor 15 verdichtet Luft oder andere gasförmige Medien im Gleichtakt . Wird also etwa ein Stufenkolben 1 nach vorne, also etwa in Richtung des Zylinderkopfs 29 bewegt, so wird die Luft in den Arbeitsräumen 21 und 22 verdichtet. Überschreitet der Druck in den Arbeitsräumen ein bestimmtes Niveau, so entweicht die verdichtete Luft über die jeweiligen Auslassventile 4 oder 14.The stepped piston 1 compresses, for example, during the downward movement in the x direction, a gaseous medium, in particular air, wherein the compressed medium can be ejected via the outlet valve 14. With the same downward movement, the gaseous medium is sucked into the first working space 21. If the stepped piston 1 moves in the opposite direction, the process is reversed. The arrows shown in Figure 1 illustrate the inflowing or outflowing air-In FIG. 2 shows an alternative embodiment of a reciprocating compressor 15. This reciprocating compressor 15 compresses air or other gaseous media in a common mode. Thus, for example, if a stepped piston 1 is moved forwards, that is to say in the direction of the cylinder head 29, then the air in the working spaces 21 and 22 is compressed. If the pressure in the working spaces exceeds a certain level, the compressed air escapes via the respective outlet valves 4 or 14.

Die Verdichtung erfolgt zweistufig. In einer ersten Stufe wird das Medium über den Ringspalt 28 im unteren Arbeitsraum 21 verdichtet. In der zweiten Stufe wird das Medium im vorderen Arbeitsraum 22 über die Kolbenfläche 30 des vorderen Kolbens 17 verdichtet. Auf Grund der verhältnismässig kleinen Kolbenfläche 30 können hier höhere Enddrücke erzielt werden. Die Anordnung zeichnet sich unter anderem dadurch aus, dass die Verluste über die Kolbenringe 5 aus der zweiten Stufe in die erste Stufe austreten und somit nicht ins Freie gelangen. So können Gasverluste erheblich minimiert werden. Im Weiteren werden die Belastungen auf die Kolbenringe 5 minimiert, da auf Grund des Stützhochdrucks im unteren Arbeitsraum 21 der auf die Kolbenringe 5 wirkende Differenzdruck bezüglich des vorderen Arbeitsraums 22 kleiner ist. Der zweite Kolbenteil 16 verfügt neben Kolbenringen 5 über zusätzliche Führungslemente 6. Je nach Dimensionierung und Anwendungszweck können mehrere solche Dichtungselemente und/oder Führungselemente angeordnet werden.The compaction takes place in two stages. In a first stage, the medium is compressed via the annular gap 28 in the lower working space 21. In the second stage, the medium in the front working chamber 22 is compressed via the piston surface 30 of the front piston 17. Due to the relatively small piston surface 30 higher end pressures can be achieved here. The arrangement is characterized inter alia by the fact that the losses escape via the piston rings 5 from the second stage in the first stage and thus not reach the outside. Thus, gas losses can be significantly minimized. Furthermore, the loads on the piston rings 5 are minimized because, due to the high support pressure in the lower working space 21, the differential pressure acting on the piston rings 5 with respect to the front working space 22 is smaller. The second piston part 16 has in addition to piston rings 5 on additional Führungslemente 6. Depending on the dimensions and purpose of several such sealing elements and / or guide elements can be arranged.

In den Figuren 1 und 2 wird der eigentliche Antrieb des Stufenkolbens 1 nicht dargestellt. Ein Stufenkolben 1 wird durch einen oszillierenden Antrieb, beispielsweise über einen Kurbeltrieb bewegt. Der Stufenkolben 1 ist dabei bevorzugt über eine Kolbenstange mit dem Antrieb verbunden. Die Führung des Stufenkolbens 1 kann insbesondere durch einen Kreuzkopf (ebenfalls nicht dargestellt) erfolgen.In Figures 1 and 2, the actual drive of the stepped piston 1 is not shown. A stepped piston 1 is moved by an oscillating drive, for example via a crank mechanism. The stepped piston 1 is preferably connected via a piston rod to the drive. The leadership of the stepped piston 1 can be done in particular by a crosshead (also not shown).

Die Figur 3 zeigt einen Schnitt durch eine obere Platte 9 mit der Darstellung eines Einlassventiles 3 in der Ausführung als Lamellenventil 31. Jeweils für ein Einlassventil 3 ist in der Platte 9 eine Bohrung 23 in Form einer Durchgangsbohrung vorzusehen, welches durch eine jeweilige Lammelle abgedeckt wird. Die Lamellenventile 31 sind dabei aussermittig angebracht. Mindestens jeweils eine Lammelle als Einlass- und Auslassventil ist insgesamt vorzusehen. Die Anzahl der Lamellen hängt im Wesentlichen von der Baugrösse und den vorgesehenen Leistungsdaten ab. Selbstverständlich müssen die Kolbenteile 16 und 17 Aussparungen an Stellen aufweisen, wo Bauteile der Ventile 3 und 4 in den Hubraum hineinragen. Die Position des Stufenkolbens 1 um die Längsachse A muss fixiert sein.FIG. 3 shows a section through an upper plate 9 with the representation of an inlet valve 3 in the embodiment as a lamella valve 31. In each case for an inlet valve 3, a bore 23 in the form of a through bore is provided in the plate 9, which is covered by a respective lamella , The lamella valves 31 are mounted eccentrically. At least one lamella each as inlet and outlet valve is to be provided in total. The number of slats depends mainly on the size and the intended performance data. Of course, the piston parts 16 and 17 must have recesses at locations where components of the valves 3 and 4 protrude into the displacement. The position of the stepped piston 1 about the longitudinal axis A must be fixed.

Die Einlassventile 3 und Auslassventile 4 können entsprechend der Ausführung mit Lamellenventilen 31 jeweils auch als Zungenventil ausgeführt sein, wobei dann eine Zunge mehrere Bohrungen 23 gleichzeitig abdecken würde (nicht dargestellt) .The intake valves 3 and exhaust valves 4 may be designed according to the embodiment with multi-disc valves 31 each as a reed valve, in which case a tongue would cover a plurality of holes 23 simultaneously (not shown).

Die Figur 4 zeigt beispielhaft eine Ventilanordnungen auf einer Platte 9, welche analog auch für die Ventilanordnung der Platte 2 des Ringspalts 28 gelten. Die Ventile 3 und 4 sind als Einzelventile mit Federrückstellung 33 ausgeführt, welche zentral über den Bohrungen 23 angeordnet sind.FIG. 4 shows, by way of example, a valve arrangement on a plate 9, which analogously also applies to the valve arrangement of the plate 2 of the annular gap 28. The valves 3 and 4 are designed as individual valves with spring return 33, which are arranged centrally above the holes 23.

Selbstverständlich können die übrigen (jeweils in den Fig. 3 oder 4 nicht dargestellten) Platten ähnliche Ventilanordnungen aufweisen.Of course, the remaining (not shown in FIGS. 3 or 4) plates may have similar valve assemblies.

Die einzelnen Ventilkonstruktionen von Lamellen-, Zungen- oder Einzelventilen sind nicht Gegenstand der Erfindung. Diese wurden in vielen Fachpublikationen detailliert beschrieben und werden als bekannt vorausgesetzt.The individual valve constructions of lamellar, tongue or individual valves are not the subject of the invention. These have been described in detail in many specialist publications and are assumed to be known.

Claims (6)

  1. A piston compressor (1) for compressing gaseous media in the same cycle in at least two working chambers comprising a stepped piston (1) including a first piston portion (16) and at least one coaxially arranged second piston portion (17), wherein to produce stroke movements the stepped piston (1) is drivable by way of a connecting rod system, a first cylinder (7) for recei ving the first piston portion (16) and for forming a first wor king chamber (21) and at least one second cylinder (18) for receiving the second piston portion (17) and for forming a second working chamber (22), wherein the second piston portion (17) is of a smaller diameter than the first piston portion (16) and wherein the second piston portion (17) forms a cylindrical working chamber (22) and the first piston portion (16) forms an annular working chamber (21), characterised in that each of the at least two cylinders (7, 8) is closed by a plate (2, 9) having valve arrangements, which plate can be fitted to and removed from the respective cylinder (16, 17), and wherein the second piston portion (17) is guided through an opening (20) in one of the plates (2), and the second piston portion (17) is arranged at the one end of the first piston portion (16), wherein the second piston portion (17) forms the front end of the stepped piston (1).
  2. A piston compressor according to claim 1 characterised in that the plates (2, 9) are in the form of discs and delimit the working chambers at the end.
  3. A piston compressor according to claim 1 or claim 2 characterised in that the plates (2, 9) are provided with inlet valves (3, 13) and outlet valves (4, 14).
  4. A piston compressor according to one of claims 1 to 3 characterised in that the valves (3, 4, 13, 14) are lamellar valves (31).
  5. A piston compressor according to one of claims 1 to 4 characterised in that the valves (3 , 4, 13, 14) are tongue valves.
  6. A piston compressor according to one of claims 1 to 6 characterised in that the valves (3, 4, 13, 14) are individual valves with spring return (33).
EP04803681A 2003-12-09 2004-12-09 Piston compressor for compressing gaseous media in at least two working chambers Not-in-force EP1702162B1 (en)

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EP03028312A EP1541867A1 (en) 2003-12-09 2003-12-09 Piston type compressor for compressing gases in at least two compression chambers
EP04803681A EP1702162B1 (en) 2003-12-09 2004-12-09 Piston compressor for compressing gaseous media in at least two working chambers
PCT/EP2004/014024 WO2005059362A1 (en) 2003-12-09 2004-12-09 Piston compressor for compressing gaseous media in at least two working chambers

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EP2161452A1 (en) 2008-09-09 2010-03-10 HAUG Kompressoren AG Piston compressor and method for installing or dismantling a piston compressor

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US20070116588A1 (en) 2007-05-24
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DE502004005581D1 (en) 2008-01-03

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