EP1979618B1 - Multi-step helical screw compressor unit - Google Patents

Multi-step helical screw compressor unit Download PDF

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Publication number
EP1979618B1
EP1979618B1 EP06754261.3A EP06754261A EP1979618B1 EP 1979618 B1 EP1979618 B1 EP 1979618B1 EP 06754261 A EP06754261 A EP 06754261A EP 1979618 B1 EP1979618 B1 EP 1979618B1
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EP
European Patent Office
Prior art keywords
drive gear
screw compressor
screw
compressor
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP06754261.3A
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German (de)
French (fr)
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EP1979618A1 (en
Inventor
Carsten Achtelik
Dieter HÜTTERMANN
Michael Besseling
Norbert Henning
Jürgen BRINGMANN
Robert Lewis Oppenheim
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GHH Rand Schraubenkompressoren GmbH
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GHH Rand Schraubenkompressoren GmbH
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Publication of EP1979618A1 publication Critical patent/EP1979618A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/40—Pumps with means for venting areas other than the working chamber, e.g. bearings, gear chambers, shaft seals

Definitions

  • the invention relates to a multi-stage screw compressor unit. It is preferably a dry-running screw compressor unit for high pressures, typically 40 bar and more. A preferred field of application is the production of compressed air for the blow molding of plastic bottles.
  • US-A-3,407,996 (corresponding DE-A-1628201 ) is a two-stage screw compressor known. It has a gearbox housing with a vertical mounting wall, on which two compressor stages are mounted cantilevered parallel to each other side by side. Each compressor stage includes a screw compressor with two intermeshing screw rotors. In the transmission housing is a gear with a drive gear, which is in engagement with two driven gears for the rotation of the rotors of the two screw compressors.
  • the document also states that the invention described therein can also be applied to multi-stage compressor units with more than two stages. How other compressor stages can be arranged, but is not specified, and in the concretely described construction is no place for other compressor stages.
  • a two-stage screw compressor unit of a similar kind is also out DE 299 22 878.9 U1 known. Also of interest are the screw compressor units described in the documents JP61-4889 . US-A-4,068,984 such as US-A-4,076,468 and EP 0582185 A1 are disclosed.
  • the invention has for its object to provide a three-stage screw compressor unit, the compressed gaseous fluid, in particular compressed air at a very high pressure, typically about 40 bar and more, can deliver and which is characterized by space-saving, simple and robust design.
  • the three-stage screw compressor unit according to the invention allow a simple change of the drive ratio and the speed ratio of the three compressor stages.
  • the screw compressor assembly according to the invention can gaseous fluid, in particular air, using only three compressor stages with a very high pressure ratio of e.g. 40: 1 and thus compressed air under high pressure, as used for industrial manufacturing operations, e.g. the blow molding of plastic bottles, needed, will be delivered.
  • the first and second stage forming screw compressors are arranged above the axis of rotation of the drive gear extending horizontal plane, while the screw compressor of the third stage below the screw compressors of the first and second stage and arranged below the plane passing through the axis of rotation of the drive gear horizontal plane and its driven gear meshes with the drive gear near its lowest point.
  • FIG. 1 shows in perspective a three-stage screw compressor unit with three screw compressors 60, 70, 80, which are flanged parallel to each other on a gear housing 90, which has the shape of a vertical disk substantially cantilevered.
  • a gear housing 90 which has the shape of a vertical disk substantially cantilevered.
  • the housing of each screw compressor 60, 70, 80 at its end facing the gear housing 90, a flange 64, 74 and 84, which is connected by screws with a mating flange of the gear housing 90.
  • the three screw compressors 60, 70, 80 are driven together by a transmission gear 90 mounted in the engine and driven by a drive gear, as will be explained in more detail.
  • the screw compressor 60 is the inlet stage (low pressure stage) with suction port 61 and outlet port 63
  • the screw compressor 70 is the second stage or intermediate pressure stage with inlet port 71 and outlet port 73
  • the screw compressor 80 is the final stage or high pressure stage with inlet port 81 and one in FIG. 1 invisible outlet opening on the side remote from the inlet opening 81 side.
  • FIG. 1 further shows an oil sump housing 76 flanged to the foot of the transmission housing 90, which is driven by oil lines 77 with the synchronized gears the screw compressors 60, 70, 80 and is connected to the arranged in the gear housing 90 drive gear.
  • FIG. 1 not shown are the inlets and outlets of the three screw compressors 60, 70, 80 interconnecting connecting lines for the medium to be compressed, in particular air. These are formed in a manner known to those skilled in the art and can, for. B. be equipped with filters, intercoolers and / or silencers.
  • the first and second stage screw compressors 60, 70 are arranged horizontally side by side while the third stage screw compressor 80 is located below the first and second stage screw compressors.
  • the oil sump housing 76 has at its top a recess 79 which provides additional space for housing the third stage screw compressor.
  • Each of the three screw compressors 60, 70, 80 from Fig. 1 has in the usual way two rotors, which are rotatably mounted parallel axis in a rotor housing and engage with helical ribs and grooves.
  • Fig. 2 the third stage of the three-stage compressor unit of Fig. 1 forming screw compressor 80, which is designed for particularly high pressures of preferably about 40 bar and more.
  • the in FIG. 2 shown screw compressor has a (shown in longitudinal section) rotor housing 1, in which two rotors 3 and 5 are mounted rotatably parallel axis.
  • the axes of rotation of the rotors 3, 5 lie in a common vertical plane.
  • Each rotor 3, 5 has a profile section 7 or 9, which has a profile with helically extending ribs or grooves, wherein the ribs and grooves of the two profile sections 7, 9 intermesh and sealingly engage each other.
  • At the profile sections 7, 9 close to both sides shaft journals 7a, 7b, 9a, 9b, with the peripheral surface seal assemblies 11, 12 cooperate to seal the rotor in the rotor housing 1.
  • the shaft journals 7a, 7b, 9a, 9b are also rotatably supported by bearings 13, 15 in the rotor housing 1.
  • the in FIG. 2 upper rotor 3 is the main rotor and has at its in FIG. 2 left end of an elongated shaft journal 7c, in the transmission housing 90 ( Fig. 1 protrudes there and carries a gear 85 which is in engagement with a transmission gear arranged in the gear housing to drive the rotor 3 for rotation.
  • the two rotors 3, 5, two intermeshing gears 17, 19 which form a synchronizing (Gleichlaufgetriebe), which transmits the rotation of the upper rotor 3 to the lower rotor 5, which is the Mauillonr, in the desired speed ratio, and ensures that the profile sections 7, 9 of the rotors 3, 5 engage without contact.
  • the rotor housing 1 is surrounded by a cooling jacket or cooling housing 21, which is formed predominantly in one piece with the rotor housing 1 and surrounds this at a distance.
  • the cooling housing 21 has large-area openings, which are closed by means of a cover plate 23 and a bottom plate 25, which are fastened by screws.
  • a cooling space 27 annularly surrounding the rotor housing 1, in which a liquid coolant, e.g. Water, circulates.
  • FIG. 2 shown screw compressor of the third stage, as well as the screw compressors 60, 70 of the first and second stage, a so-called dry runner, ie its compression space is kept oil-free.
  • Oil from the oil sump 76 which is circulated by an (not shown) oil pump, is only for the lubrication of the drive gear (gears 65, 75, 85, 95) and the bearings 13, 15 and the constant velocity gear (17, 19) of each of Screw compressors 60, 70, 80 (see 17, 19 in Fig. 2 ), but does not get into the compression space of the screw compressors.
  • a flange plate 84 which serves for fastening the screw compressor to the mounting wall 91 of the gear housing and for this purpose has holes for fastening screws.
  • Compressor unit shown at the inlet 61 of the first compressor stage 60 When operating the in Fig. 1 Compressor unit shown at the inlet 61 of the first compressor stage 60 sucked air from this to a pressure in the range of 3 to 6 bar, preferably about 3.5 bar, compressed and then from the second compressor stage 70 to an intermediate pressure in the range of 10 to 15 bar, preferably about 12 bar, compressed.
  • This precompressed air passes from the outlet 73 of the second stage 70 via a (not shown) connecting line to the inlet 81 of the third compressor stage 80 and is compressed in this to a final pressure in the range of 30 to 50 bar, preferably about 40 bar.
  • the pressure ratios in each of the three screw compressors 60, 70, 80 are approximately equal.
  • Fig. 3 shows in perspective, partially in section, the gear housing 90 with the gear arranged therein for driving the three screw compressors 60, 70, 80.
  • the gear housing 90 has on its one side a vertical mounting wall 91 to which the housing of the three compressor screws of the compressors 60th , 70, 80 (in Fig. 3 not shown) are fastened with Flanschverschraubungen.
  • the gear housing 90 is closed by a bearing cap 92, in which by means of a bearing ring 93, a drive shaft 94 is mounted, which carries a drive gear 95.
  • the projecting beyond the drive gear 95 end of the drive shaft 94 is in a bearing cup used in the mounting wall 91 (see Fig. 5 ) stored.
  • the drive gear 95 is engaged with three driven gears 65, 75, 85 distributed around the circumference of the drive gear 95 and associated with the three screw compressors 60, 70 for driving them.
  • Each of the driven gears 65, 75, 85 is seated on a rotor shaft journal of one of the three screw compressors 60, 70, 80 projecting through a corresponding opening in the mounting wall 91 into the gear housing 90.
  • Fig. 4 the arrangement of the three driven gears 65, 75, 85 with respect to the drive gear 95 is shown.
  • the driven gears 65, 75 of the screw compressors 60 or 70 of the first and second stages are located above the plane passing through the axis of rotation A of the drive gear 95 horizontal plane BB.
  • the driven gear 85 of the third stage screw compressor 80 is well below the horizontal plane BB passing through the axis A, preferably near the lowest point T of the drive gear 95.
  • the drive gear 65 for the first compressor stage is arranged to in that a straight line C connecting its axis 65 'to the axis A of the drive gear 95 encloses an angle ⁇ of not more than 30 ° with the horizontal straight line BB passing through the axis A of the drive gear 95.
  • the corresponding angle ⁇ is preferably not more than 20 °.
  • the driven gear 85 of the third compressor stage 80 is disposed so close to the lowest point T of the drive gear 95 that a line D connecting the axis of the driven gear 85 with the rotational axis A of the drive gear 95 with the vertical plane passing through the axis A of the drive gear 95 an angle ⁇ of not more than 20 °.
  • Fig. 5 shows a view of the mounting wall 91 of the gear housing 90. This is shown cut out in the upper area to show the drive gear behind arranged 95, which with the driven gears 65, 75, 85 of the three screw compressors 60, 70, 80 (in Fig. 5 omitted) is engaged.
  • the mounting wall 91 has openings 68, 78, 88, through which the gear wheels 65, 75, 85 bearing shaft journals (see 7b in Fig. 2 ) of the screw compressors 60, 70, 80 may enter the transmission housing 90.
  • the mounting wall 91 has rib-like raised, the openings 68, 78, 88 surrounding counter flanges 69, 79, 89, where the flanges 64, 74, 84 of the compressors 60, 70, 80 (see. Fig. 1 ) are fastened by means of screws and suitable seals.
  • a bearing cup 97 is used, in which the end of the drive gear 95 supporting drive shaft 94 (see Fig. 3 ) is stored.
  • Both the storage pot 97 and the in Fig. 3 shown bearing ring 93 for supporting the drive shaft 94 are formed eccentrically.
  • the third-stage screw compressor 80 is detachably connected to the rotor housing 21 thereof by means of screws and can be exchanged for a flange plate with a changed hole pattern, whereby the position of the screw compressor 80 and thus its driven gear 85 can be changed vertically, as by the vertical double-headed arrow 86 in Fig. 5 indicated.
  • This possibility of adjustment of the drive gear 95 in the horizontal direction 98 and the driven gear of the third stage in the vertical direction 86 allows the use of different sets of gear wheels forming the gear 95, 65, 75, 85, wherein by different, matched diameter the drive ratio in total and also the relative rotational speeds of the three compressor stages 60, 70, 80 can be changed.
  • all four gear forming gears 65, 75, 85, 95 are exchanged for such other diameter, wherein an adjustment of only two of these elements in two mutually perpendicular directions, namely the drive gear 95 in the horizontal direction 98 and the gear 85 of the third stage in the vertical direction 86, sufficient to ensure the proper engagement of the gears even with changed diameter ratios.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Supercharger (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

A multi-staged screw compressor system includes a gearbox, a drive gear located in the gearbox, and a first, second and third screw compressor that are fastened to the gearbox and coupled to the drive gear such that the first, second, and third screw compressors are all driven in common by the drive gear. During operation the first screw compressor compresses a flow of gaseous fluid from an inlet pressure to a first intermediate pressure, the second screw compressor compresses the flow of fluid from the first intermediate pressure to a second intermediate pressure, and the third screw compressor compresses the flow of fluid from the second intermediate pressure to a final pressure. The final pressure is at least thirty times the inlet pressure.

Description

Die Erfindung betrifft ein mehrstufiges Schraubenkompressoraggregat. Es handelt sich vorzugsweise um ein trockenlaufendes Schraubenkompressoraggregat für hohe Drücke, typischerweise für 40 bar und mehr. Ein bevorzugtes Anwendungsgebiet ist die Erzeugung von Druckluft für das Blasformen von Kunststoffflaschen.The invention relates to a multi-stage screw compressor unit. It is preferably a dry-running screw compressor unit for high pressures, typically 40 bar and more. A preferred field of application is the production of compressed air for the blow molding of plastic bottles.

Aus US-A-3,407,996 (entsprechend DE-A-1628201 ) ist ein zweistufiges Schraubenkompressoraggregat bekannt. Es weist ein Getriebegehäuse mit einer lotrechten Montagewand auf, an der nebeneinander zwei Kompressorstufen parallel zueinander frei auskragend befestigt sind. Jede Kompressorstufe umfasst einen Schraubenkompressor mit zwei miteinander kämmenden Schraubenrotoren. In dem Getriebegehäuse befindet sich ein Getriebe mit einem Antriebszahnrad, das mit zwei angetriebenen Zahnrädern für die Drehung der Rotoren der beiden Schraubenkompressoren in Eingriff ist. In dem Dokument ist auch angegeben, dass die dort beschriebene Erfindung auch bei mehrstufigen Kompressoraggregaten mit mehr als zwei Stufen angewendet werden kann. Auf welche Weise weitere Kompressorstufen angeordnet werden können, ist aber nicht angegeben, und bei der konkret beschriebenen Konstruktion ist für weitere Kompressorstufen kein Platz.Out US-A-3,407,996 (corresponding DE-A-1628201 ) is a two-stage screw compressor known. It has a gearbox housing with a vertical mounting wall, on which two compressor stages are mounted cantilevered parallel to each other side by side. Each compressor stage includes a screw compressor with two intermeshing screw rotors. In the transmission housing is a gear with a drive gear, which is in engagement with two driven gears for the rotation of the rotors of the two screw compressors. The document also states that the invention described therein can also be applied to multi-stage compressor units with more than two stages. How other compressor stages can be arranged, but is not specified, and in the concretely described construction is no place for other compressor stages.

Ein zweistufiges Schraubenkompressoraggregat ähnlicher Art ist auch aus DE 299 22 878.9 U1 bekannt. Von Interesse sind auch die Schraubenkompressoraggregate, die in den Druckschriften JP61-4889 , US-A-4,068,984 sowie US-A-4,076,468 und EP 0582185 A1 offenbart sind.A two-stage screw compressor unit of a similar kind is also out DE 299 22 878.9 U1 known. Also of interest are the screw compressor units described in the documents JP61-4889 . US-A-4,068,984 such as US-A-4,076,468 and EP 0582185 A1 are disclosed.

Der Erfindung liegt die Aufgabe zugrunde, ein dreistufiges Schraubenkompressoraggregat zu schaffen, das komprimiertes gasförmiges Fluid, insbesondere Druckluft bei einem sehr hohen Druck, typischerweise ca. 40 bar und mehr, liefern kann und das sich durch platzsparende, einfache und robuste Bauweise auszeichnet. In weiterer Ausgestaltung der Erfindung soll das dreistufige Schraubenkompressoraggregat gemäß der Erfindung auf einfache Weise eine Änderung der Antriebsübersetzung und des Drehzahlverhältnisses der drei Kompressorstufen ermöglichen.The invention has for its object to provide a three-stage screw compressor unit, the compressed gaseous fluid, in particular compressed air at a very high pressure, typically about 40 bar and more, can deliver and which is characterized by space-saving, simple and robust design. In a further embodiment of the invention, the three-stage screw compressor unit according to the invention allow a simple change of the drive ratio and the speed ratio of the three compressor stages.

Zur Lösung der Aufgabe ist erfindungsgemäß ein dreistufiges Schraubenkompressoraggregat mit den Merkmalen des Anspruchs 1 vorgesehen. Die abhängigen Ansprüche beziehen sich auf weitere vorteilhafte Merkmale der Erfindung.To achieve the object, a three-stage screw compressor with the features of claim 1 is provided according to the invention. The dependent claims relate to further advantageous features of the invention.

Mit dem erfindungsgemäßen Schraubenkompressoraggregat kann gasförmiges Fluid, insbesondere Luft, unter Verwendung von nur drei Verdichterstufen mit einem sehr hohen Druckverhältnis von z.B. 40:1 komprimiert werden und damit Druckluft unter hohem Druck, wie sie für industrielle Fertigungsvorgänge, z.B. das Blasformen von Kunsstoffflaschen, benötigt wird, geliefert werden.With the screw compressor assembly according to the invention can gaseous fluid, in particular air, using only three compressor stages with a very high pressure ratio of e.g. 40: 1 and thus compressed air under high pressure, as used for industrial manufacturing operations, e.g. the blow molding of plastic bottles, needed, will be delivered.

Bei dem erfindungsgemäßen Schraubenkompressoraggregat sind vorzugsweise die die erste und zweite Stufe bildenden Schraubenkompressoren oberhalb der durch die Drehachse des Antriebszahnrades verlaufende Horizontalebene angeordnet, während der Schraubenkompressor der dritten Stufe unterhalb der Schraubenkompressoren der ersten und zweiten Stufe und unterhalb der durch die Drehachse des Antriebszahnrades verlaufenden Horizontalebene angeordnet ist und sein angetriebenes Zahnrad mit dem Antriebszahnrad in der Nähe von dessen tiefsten Punkt in Eingriff steht. Hierdurch ergibt sich eine besonders vorteilhafte Ausnutzung der vorhandenen Platzverhältnisse und eine platzsparende, kompakte Bauweise des Kompressoraggregats. Durch Verwendung unterschiedlicher austauschbarer Lager- und Flanschteile kann die Position der Antriebswelle in Horizontalrichtung und die Position der dritten Kompressorstufe in Vertikalrichtung verändert werden, um die Getriebekonfiguration an unterschiedliche Durchmesser der Zahnräder und damit an unterschiedliche Drehzahlverhältnisse der Kompressorstufen anzupassen.In the screw compressor assembly according to the invention preferably the first and second stage forming screw compressors are arranged above the axis of rotation of the drive gear extending horizontal plane, while the screw compressor of the third stage below the screw compressors of the first and second stage and arranged below the plane passing through the axis of rotation of the drive gear horizontal plane and its driven gear meshes with the drive gear near its lowest point. This results in a particularly advantageous utilization of the available space and a space-saving, compact design of the compressor unit. By using different replaceable bearing and flange parts, the position of the drive shaft in the horizontal direction and the position of the third compressor stage in the vertical direction can be changed to adapt the transmission configuration to different diameters of the gears and thus to different speed ratios of the compressor stages.

Eine Ausführungsform der Erfindung wird anhand der Zeichnungen näher erläutert. Es zeigt:

Fig. 1
eine perspektivische Ansicht eines dreistufigen Kompressoraggregates gemäß einer Ausführungsform der Erfindung;
Fig. 2
eine perspektivische, teilweise geschnittene Ansicht des Schraubenkompressors, der die dritte Stufe, des Kompressoraggregats gemäß Fig. 1 bildet;
Fig. 3
eine perspektivische, teilweise geschnittene Ansicht des Getriebegehäuses und Getriebes des Kompressoraggregats gemäß Fig. 1, bei weggelassenen Kompressorstufen;
Fig. 4
eine vereinfachte Darstellung der Zahnräder, die das Getriebe des Kompressoraggregates bilden;
Fig. 5
eine Ansicht der Montagewand des Getriebegehäuses, teilweise weggebrochen, um das Getriebe sichtbar zu machen.
An embodiment of the invention will be explained in more detail with reference to the drawings. It shows:
Fig. 1
a perspective view of a three-stage compressor unit according to an embodiment of the invention;
Fig. 2
a perspective, partially sectioned view of the screw compressor, the third stage, the compressor unit according to Fig. 1 forms;
Fig. 3
a perspective, partially sectioned view of the transmission housing and transmission of the compressor unit according to Fig. 1 , with omitted compressor stages;
Fig. 4
a simplified representation of the gears that make up the transmission of the compressor unit;
Fig. 5
a view of the mounting wall of the transmission housing, partially broken away to make the transmission visible.

Figur 1 zeigt perspektivisch ein dreistufiges Schraubenkompressoraggregat mit drei Schraubenkompressoren 60, 70, 80, die an einem Getriebegehäuse 90, das im wesentlichen die Form einer lotrechten Scheibe hat, parallel zueinander frei auskragend angeflanscht sind. Zu diesem Zweck hat das Gehäuse jedes Schraubenkompressors 60, 70, 80 an seinem dem Getriebegehäuse 90 zugewandten Ende einen Flansch 64, 74 bzw. 84, der mittels Schrauben mit einem Gegenflansch des Getriebegehäuses 90 verbunden wird. Die drei Schraubenkompressoren 60, 70, 80 werden gemeinsam von einem im Getriebegehäuse 90 gelagerten und durch einen Motor angetriebenen Antriebszahnrad angetrieben, wie dies noch näher erläutert wird. In dem dargestellten Kompressoraggregat ist der Schraubenkompressor 60 die Eingangsstufe (Niederdruckstufe) mit Ansaugöffnung 61 und Auslassöffnung 63, der Schraubenkompressor 70 ist die zweite Stufe oder Zwischendruckstufe mit Einlassöffnung 71 und Auslassöffnung 73, und der Schraubenkompressor 80 ist die Endstufe oder Hochdruckstufe mit Einlassöffnung 81 und einer in Figur 1 nicht sichtbaren Auslassöffnung auf der von der Einlassöffnung 81 abgewandten Seite. Figur 1 zeigt ferner eine an den Fuß des Getriebegehäuses 90 angeflanschtes Ölsumpfgehäuse 76, das durch Ölleitungen 77 mit den Gleichlaufgetrieben der Schraubenkompressoren 60, 70, 80 sowie mit dem im Getriebegehäuse 90 angeordneten Antriebsgetriebe verbunden ist. FIG. 1 shows in perspective a three-stage screw compressor unit with three screw compressors 60, 70, 80, which are flanged parallel to each other on a gear housing 90, which has the shape of a vertical disk substantially cantilevered. For this purpose, the housing of each screw compressor 60, 70, 80 at its end facing the gear housing 90, a flange 64, 74 and 84, which is connected by screws with a mating flange of the gear housing 90. The three screw compressors 60, 70, 80 are driven together by a transmission gear 90 mounted in the engine and driven by a drive gear, as will be explained in more detail. In the illustrated compressor unit, the screw compressor 60 is the inlet stage (low pressure stage) with suction port 61 and outlet port 63, the screw compressor 70 is the second stage or intermediate pressure stage with inlet port 71 and outlet port 73, and the screw compressor 80 is the final stage or high pressure stage with inlet port 81 and one in FIG. 1 invisible outlet opening on the side remote from the inlet opening 81 side. FIG. 1 further shows an oil sump housing 76 flanged to the foot of the transmission housing 90, which is driven by oil lines 77 with the synchronized gears the screw compressors 60, 70, 80 and is connected to the arranged in the gear housing 90 drive gear.

In Figur 1 nicht dargestellt sind die die Ein- und Auslässe der drei Schraubenkompressoren 60, 70, 80 miteinander verbindenden Verbindungsleitungen für das zu komprimierende Medium, insbesondere Luft. Diese sind in dem Fachmann bekannter Weise ausgebildet und können z. B. mit Filtern, Zwischenkühlern und/oder Schalldämpfern ausgestattet sein.In FIG. 1 not shown are the inlets and outlets of the three screw compressors 60, 70, 80 interconnecting connecting lines for the medium to be compressed, in particular air. These are formed in a manner known to those skilled in the art and can, for. B. be equipped with filters, intercoolers and / or silencers.

Die Schraubenkompressoren 60, 70 der ersten und zweiten Stufe sind horizontal nebeneinander angeordnet, während der Schraubenkompressor 80 der dritten Stufe unterhalb der Schraubenkompressoren der ersten und zweiten Stufe angeordnet ist. Das Ölsumpfgehäuse 76 hat an seiner Oberseite eine Vertiefung 79, die zusätzlichen Platz für die Unterbringung des Schraubenkompressors der dritten Stufe schafft.The first and second stage screw compressors 60, 70 are arranged horizontally side by side while the third stage screw compressor 80 is located below the first and second stage screw compressors. The oil sump housing 76 has at its top a recess 79 which provides additional space for housing the third stage screw compressor.

Jeder der drei Schraubenkompressoren 60, 70, 80 von Fig. 1 weist in üblicher Weise zwei Rotoren auf, die in einem Rotorgehäuse parallelachsig drehbar gelagert sind und mit schraubenförmigen Rippen und Nuten ineinander greifen. Als Beispiel zeigt Fig. 2 den die dritte Stufe des dreistufigen Kompressoraggregats von Fig. 1 bildenden Schraubenkompressor 80, der für besonders hohe Drücke von vorzugsweise ca. 40 bar und mehr ausgelegt ist.Each of the three screw compressors 60, 70, 80 from Fig. 1 has in the usual way two rotors, which are rotatably mounted parallel axis in a rotor housing and engage with helical ribs and grooves. As an example shows Fig. 2 the third stage of the three-stage compressor unit of Fig. 1 forming screw compressor 80, which is designed for particularly high pressures of preferably about 40 bar and more.

Der in Figur 2 gezeigte Schraubenkompressor hat ein (im Längsschnitt dargestelltes) Rotorgehäuse 1, in welchem zwei Rotoren 3 und 5 parallelachsig drehbar gelagert sind. Die Drehachsen der Rotoren 3, 5 liegen in einer gemeinsamen vertikalen Ebene. Jeder Rotor 3, 5 hat einen Profilabschnitt 7 bzw. 9, der ein Profil mit schraubenförmig verlaufenden Rippen bzw. Nuten aufweist, wobei die Rippen und Nuten der beiden Profilabschnitte 7, 9 kämmend und abdichtend ineinander greifen. An die Profilabschnitte 7, 9 schließen sich beiderseits Wellenzapfen 7a, 7b, 9a, 9b an, mit deren Umfangsfläche Dichtungsanordnungen 11, 12 zusammenwirken, um den Rotor im Rotorgehäuse 1 abzudichten. Die Wellenzapfen 7a, 7b, 9a, 9b sind ferner durch Lager 13, 15 in dem Rotorgehäuse 1 drehbar gelagert.The in FIG. 2 shown screw compressor has a (shown in longitudinal section) rotor housing 1, in which two rotors 3 and 5 are mounted rotatably parallel axis. The axes of rotation of the rotors 3, 5 lie in a common vertical plane. Each rotor 3, 5 has a profile section 7 or 9, which has a profile with helically extending ribs or grooves, wherein the ribs and grooves of the two profile sections 7, 9 intermesh and sealingly engage each other. At the profile sections 7, 9 close to both sides shaft journals 7a, 7b, 9a, 9b, with the peripheral surface seal assemblies 11, 12 cooperate to seal the rotor in the rotor housing 1. The shaft journals 7a, 7b, 9a, 9b are also rotatably supported by bearings 13, 15 in the rotor housing 1.

Der in Figur 2 obere Rotor 3 ist der Hauptläufer und weist an seinem in Figur 2 linken Ende einen verlängerten Wellenzapfen 7c auf, der in das Getriebegehäuse 90 (Fig. 1) hineinragt und dort ein Zahnrad 85 trägt, das mit einem im Getriebegehäuse angeordneten Antriebszahnrad in Eingriff ist, um den Rotor 3 zur Drehung anzutreiben. An dem in Figur 2 rechten Ende weisen die beiden Rotoren 3, 5 zwei miteinander kämmende Zahnräder 17, 19 auf, die ein Synchronisiergetriebe (Gleichlaufgetriebe) bilden, das die Drehung von dem oberen Rotor 3 auf den unteren Rotor 5, der der Nebenläufer ist, im gewünschten Drehzahlverhältnis überträgt, und dafür sorgt, dass die Profilabschnitte 7, 9 der Rotoren 3, 5 berührungsfrei ineinandergreifen.The in FIG. 2 upper rotor 3 is the main rotor and has at its in FIG. 2 left end of an elongated shaft journal 7c, in the transmission housing 90 ( Fig. 1 protrudes there and carries a gear 85 which is in engagement with a transmission gear arranged in the gear housing to drive the rotor 3 for rotation. At the in FIG. 2 right end, the two rotors 3, 5, two intermeshing gears 17, 19 which form a synchronizing (Gleichlaufgetriebe), which transmits the rotation of the upper rotor 3 to the lower rotor 5, which is the Nebenläufer, in the desired speed ratio, and ensures that the profile sections 7, 9 of the rotors 3, 5 engage without contact.

Das Rotorgehäuse 1 ist von einem Kühlmantel oder Kühlgehäuse 21 umgeben, das überwiegend einstückig mit dem Rotorgehäuse 1 ausgebildet ist und dieses mit Abstand umgibt. Oben und unten hat das Kühlgehäuse 21 großflächige Öffnungen, die mittels einer Deckelplatte 23 bzw. einer Bodenplatte 25, die durch Schrauben befestigt sind, verschlossen sind. Zwischen dem Rotorgehäuse 1 und dem Kühlgehäuse 21, 23, 25 befindet sich ein das Rotorgehäuse 1 ringförmig umgebender Kühlraum 27, in dem ein flüssiges Kühlmittel, z.B. Wasser, zirkuliert.The rotor housing 1 is surrounded by a cooling jacket or cooling housing 21, which is formed predominantly in one piece with the rotor housing 1 and surrounds this at a distance. Above and below, the cooling housing 21 has large-area openings, which are closed by means of a cover plate 23 and a bottom plate 25, which are fastened by screws. Between the rotor housing 1 and the cooling housing 21, 23, 25 there is a cooling space 27 annularly surrounding the rotor housing 1, in which a liquid coolant, e.g. Water, circulates.

Der in Figur 2 dargestellte Schraubenkompressor der dritten Stufe ist, ebenso wie die Schraubenkompressoren 60, 70 der ersten und zweiten Stufe, ein sogenannter Trockenläufer, d.h. sein Verdichtungsraum ist ölfrei gehalten. Öl aus dem Ölsumpf 76, das durch eine (nicht dargestellte) Ölpumpe zirkuliert wird, wird nur für die Schmierung des Antriebsgetriebes (Zahnräder 65, 75, 85, 95) und der Lager 13, 15 sowie des Gleichlaufgetriebes (17, 19) jedes der Schraubenkompressoren 60, 70, 80 (siehe 17, 19 in Fig. 2) verwendet, gelangt aber nicht in den Verdichtungsraum der Schraubenkompressoren.The in FIG. 2 shown screw compressor of the third stage, as well as the screw compressors 60, 70 of the first and second stage, a so-called dry runner, ie its compression space is kept oil-free. Oil from the oil sump 76, which is circulated by an (not shown) oil pump, is only for the lubrication of the drive gear (gears 65, 75, 85, 95) and the bearings 13, 15 and the constant velocity gear (17, 19) of each of Screw compressors 60, 70, 80 (see 17, 19 in Fig. 2 ), but does not get into the compression space of the screw compressors.

An dem in Fig. 2 linken Ende des Rotorgehäuses 1 ist lösbar mittels Schrauben eine Flanschplatte 84 befestigt, die zur Befestigung des Schraubenkompressors an der Montagewand 91 des Getriebegehäuses dient und zu diesem Zweck Löcher für Befestigungsschrauben aufweist. Durch Auswechseln der Flanschplatte 84 gegen eine solche mit anderem Lochbild kann die Position, in der der Schraubenkompressor an dem Getriebegehäuse 90 befestigt wird, verändert werden.At the in Fig. 2 The left end of the rotor housing 1 is detachably fastened by means of screws, a flange plate 84 which serves for fastening the screw compressor to the mounting wall 91 of the gear housing and for this purpose has holes for fastening screws. By replacing the flange plate 84 against such with another hole pattern, the position in which the screw compressor is attached to the transmission housing 90 can be changed.

Bei Betrieb des in Fig. 1 gezeigten Kompressoraggregats wird am Einlass 61 der ersten Kompressorstufe 60 angesaugte Luft von dieser auf einen Druck im Bereich von 3 bis 6 bar, vorzugsweise ca. 3,5 bar, komprimiert sowie anschließend von der zweiten Kompressorstufe 70 auf einen Zwischendruck im Bereich von 10 bis 15 bar, vorzugsweise ca. 12 bar, komprimiert. Diese vorverdichtete Luft gelangt vom Auslass 73 der zweiten Stufe 70 über eine (nicht dargestellte) Verbindungsleitung zum Einlass 81 der dritten Kompressorstufe 80 und wird in dieser auf einen Enddruck im Bereich von 30 bis 50 bar, vorzugsweise ca. 40 bar, komprimiert. Bei den vorstehend genannten bevorzugten Betriebsdrücken sind die Druckverhältnisse in jedem der drei Schraubenkompressoren 60, 70, 80 annähernd gleich.When operating the in Fig. 1 Compressor unit shown at the inlet 61 of the first compressor stage 60 sucked air from this to a pressure in the range of 3 to 6 bar, preferably about 3.5 bar, compressed and then from the second compressor stage 70 to an intermediate pressure in the range of 10 to 15 bar, preferably about 12 bar, compressed. This precompressed air passes from the outlet 73 of the second stage 70 via a (not shown) connecting line to the inlet 81 of the third compressor stage 80 and is compressed in this to a final pressure in the range of 30 to 50 bar, preferably about 40 bar. At the above preferred operating pressures, the pressure ratios in each of the three screw compressors 60, 70, 80 are approximately equal.

Fig. 3 zeigt perspektivisch, teilweise im Schnitt, das Getriebegehäuse 90 mit dem darin angeordneten Getriebe für den Antrieb der drei Schraubenkompressoren 60, 70, 80. Das Getriebegehäuse 90 hat auf seiner einen Seite eine lotrechte Montagewand 91, an der die Gehäuse der drei Kompressorenschrauben der Kompressoren 60, 70, 80 (in Fig. 3 nicht dargestellt) mit Flanschverschraubungen befestigt werden. Auf der anderen Seite ist das Getriebegehäuse 90 durch einen Lagerdeckel 92 verschlossen, in welchem mittels eines Lagerrings 93 eine Antriebswelle 94 gelagert ist, die ein Antriebszahnrad 95, trägt. Das über das Antriebszahnrad 95 hinausragende Ende der Antriebswelle 94 ist in einem in der Montagewand 91 eingesetzten Lagertopf (siehe Fig. 5) gelagert. Das Antriebszahnrad 95 ist in Eingriff mit drei angetriebenen Zahnrädern 65, 75, 85, die um den Umfang des Antriebszahnrades 95 verteilt angeordnet und den drei Schraubenkompressoren 60, 70 zugeordnet sind, um diese anzutreiben. Jedes der angetriebenen Zahnräder 65, 75, 85 sitzt auf einem durch eine entsprechende Öffnung in der Montagewand 91 in das Getriebegehäuse 90 hineinragenden Rotorwellenzapfen eines der drei Schraubenkompressoren 60, 70, 80. Fig. 3 shows in perspective, partially in section, the gear housing 90 with the gear arranged therein for driving the three screw compressors 60, 70, 80. The gear housing 90 has on its one side a vertical mounting wall 91 to which the housing of the three compressor screws of the compressors 60th , 70, 80 (in Fig. 3 not shown) are fastened with Flanschverschraubungen. On the other hand, the gear housing 90 is closed by a bearing cap 92, in which by means of a bearing ring 93, a drive shaft 94 is mounted, which carries a drive gear 95. The projecting beyond the drive gear 95 end of the drive shaft 94 is in a bearing cup used in the mounting wall 91 (see Fig. 5 ) stored. The drive gear 95 is engaged with three driven gears 65, 75, 85 distributed around the circumference of the drive gear 95 and associated with the three screw compressors 60, 70 for driving them. Each of the driven gears 65, 75, 85 is seated on a rotor shaft journal of one of the three screw compressors 60, 70, 80 projecting through a corresponding opening in the mounting wall 91 into the gear housing 90.

In Fig. 4 ist die Anordnung der drei angetriebenen Zahnräder 65, 75, 85 bezüglich des Antriebszahnrades 95 dargestellt. Die angetriebenen Zahnräder 65, 75 der Schraubenkompressoren 60 oder 70 der ersten und zweiten Stufe befinden sich oberhalb der durch die Rotationsachse A des Antriebszahnrades 95 verlaufenden Horizontalebene B-B. Dagegen befindet sich das angetriebene Zahnrad 85 des Schraubenkompressors 80 der dritten Stufe deutlich unter der durch die Achse A verlaufenden Horizontalebene B-B, und zwar vorzugsweise in der Nähe des tiefsten Punktes T des Antriebszahnrades 95. Vorzugsweise ist das Antriebszahnrad 65 für die erste Kompressorstufe so angeordnet, dass eine seine Achse 65' mit der Achse A des Antriebszahnrades 95 verbindende Gerade C mit der durch die Achse A des Antriebszahnrades 95 verlaufenden horizontalen Geraden B-B einen Winkel α von nicht mehr als 30° einschließt. Für das angetriebene Zahnrad 75 der zweiten Kompressorstufe 70 beträgt der entsprechende Winkel β vorzugsweise nicht mehr als 20°. Andererseits ist das angetriebene Zahnrad 85 der dritten Kompressorstufe 80 so nahe am tiefsten Punkt T des Antriebszahnrades 95 angeordnet, dass ein die Achse des angetriebenen Zahnrades 85 mit der Drehachse A des Antriebszahnrades 95 verbindende Gerade D mit der durch die Achse A des Antriebszahnrades 95 verlaufenden Vertikalebene einen Winkel γ von nicht mehr als 20° einschließt.In Fig. 4 the arrangement of the three driven gears 65, 75, 85 with respect to the drive gear 95 is shown. The driven gears 65, 75 of the screw compressors 60 or 70 of the first and second stages are located above the plane passing through the axis of rotation A of the drive gear 95 horizontal plane BB. In contrast, the driven gear 85 of the third stage screw compressor 80 is well below the horizontal plane BB passing through the axis A, preferably near the lowest point T of the drive gear 95. Preferably, the drive gear 65 for the first compressor stage is arranged to in that a straight line C connecting its axis 65 'to the axis A of the drive gear 95 encloses an angle α of not more than 30 ° with the horizontal straight line BB passing through the axis A of the drive gear 95. For the driven gear 75 of the second compressor stage 70, the corresponding angle β is preferably not more than 20 °. On the other hand, the driven gear 85 of the third compressor stage 80 is disposed so close to the lowest point T of the drive gear 95 that a line D connecting the axis of the driven gear 85 with the rotational axis A of the drive gear 95 with the vertical plane passing through the axis A of the drive gear 95 an angle γ of not more than 20 °.

Fig. 5 zeigt eine Ansicht der Montagewand 91 des Getriebegehäuses 90. Diese ist im oberen Bereich ausgeschnitten dargestellt, um das dahinter angeordnete Antriebszahnrad 95 zu zeigen, welches mit den angetriebenen Zahnrädern 65, 75, 85 der drei Schraubenkompressoren 60, 70, 80 (in Fig. 5 weggelassen) in Eingriff steht. Die Montagewand 91 weist Öffnungen 68, 78, 88 auf, durch die die Zahnräder 65, 75, 85 tragenden Wellenzapfen (siehe 7b in Fig. 2) der Schraubenkompressoren 60, 70, 80 in das Getriebegehäuse 90 eintreten können. Die Montagewand 91 weist rippenartig erhöhte, die Öffnungen 68, 78, 88 umgebende Gegenflansche 69, 79, 89 auf, an denen die Flansche 64, 74, 84 der Kompressoren 60, 70, 80 (vgl. Fig. 1) mittels Schrauben und über geeignete Dichtungen befestigt werden. Fig. 5 shows a view of the mounting wall 91 of the gear housing 90. This is shown cut out in the upper area to show the drive gear behind arranged 95, which with the driven gears 65, 75, 85 of the three screw compressors 60, 70, 80 (in Fig. 5 omitted) is engaged. The mounting wall 91 has openings 68, 78, 88, through which the gear wheels 65, 75, 85 bearing shaft journals (see 7b in Fig. 2 ) of the screw compressors 60, 70, 80 may enter the transmission housing 90. The mounting wall 91 has rib-like raised, the openings 68, 78, 88 surrounding counter flanges 69, 79, 89, where the flanges 64, 74, 84 of the compressors 60, 70, 80 (see. Fig. 1 ) are fastened by means of screws and suitable seals.

In die Montagewand 91 des Getriebegehäuses 90 ist ein Lagertopf 97 eingesetzt, in welchem das Ende der das Antriebszahnrad 95 tragenden Antriebswelle 94 (siehe Fig. 3) gelagert ist. Sowohl der Lagertopf 97 als auch der in Fig. 3 gezeigte Lagerring 93 zur Lagerung der Antriebswelle 94 sind exzentrisch ausgebildet. Durch Austausch des Lagerrings 93 und des Lagertopfes 97 gegen solche mit unterschiedlicher Exzentrizität kann die Position des Antriebszahnrades 95 in horizontaler Richtung geändert werden, wie durch den horizontalen Doppelpfeil 98 in Fig. 5 angedeutet.In the mounting wall 91 of the gear housing 90, a bearing cup 97 is used, in which the end of the drive gear 95 supporting drive shaft 94 (see Fig. 3 ) is stored. Both the storage pot 97 and the in Fig. 3 shown bearing ring 93 for supporting the drive shaft 94 are formed eccentrically. By replacing the bearing ring 93 and the bearing cup 97 against those with different eccentricity For example, the position of the drive gear 95 can be changed in the horizontal direction as indicated by the horizontal double arrow 98 in FIG Fig. 5 indicated.

Ferner ist die an den Gegenflansch 89 des Getriebegehäuses anzuschraubende Flanschplatte 84 (siehe auch Fig. 2) des die dritte Stufe bildenden Schraubenkompressors 80 mit dessen Rotorgehäuse 21 lösbar mittels Schrauben verbunden und kann gegen eine Flanschplatte mit geändertem Lochbild ausgetauscht werden, wodurch die Position des Schraubenkompressors 80 und damit seines angetriebenen Zahnrades 85 in Vertikalrichtung geändert werden kann, wie durch den vertikalen Doppelpfeil 86 in Fig. 5 angedeutet.Further, to be screwed to the counter flange 89 of the gear housing flange plate 84 (see also Fig. 2 ) of the third-stage screw compressor 80 is detachably connected to the rotor housing 21 thereof by means of screws and can be exchanged for a flange plate with a changed hole pattern, whereby the position of the screw compressor 80 and thus its driven gear 85 can be changed vertically, as by the vertical double-headed arrow 86 in Fig. 5 indicated.

Diese Möglichkeit der Verstellung des Antriebszahnrades 95 in Horizontalrichtung 98 und des angetriebenen Zahnrades der dritten Stufe in Vertikalrichtung 86 ermöglicht die Verwendung unterschiedlicher Radsätze der das Getriebe bildenden Zahnräder 95, 65, 75, 85, wobei durch unterschiedliche, aneinander angepasste Durchmesser die Antriebsübersetzung insgesamt und auch die relativen Drehgeschwindigkeiten der drei Kompressorstufen 60, 70, 80 geändert werden können. Dabei können alle vier das Getriebe bildenden Zahnräder 65, 75, 85, 95 gegen solche anderen Durchmessers ausgetauscht werden, wobei eine Verstellung von nur zweien dieser Elemente in zwei zueinander senkrechten Richtungen, nämlich des Antriebszahnrades 95 in Horizontalrichtung 98 und des Zahnrades 85 der dritten Stufe in Vertikalrichtung 86, ausreicht, um den ordnungsgemäßen Eingriff der Zahnräder auch bei geänderten Durchmesserverhältnissen zu gewährleisten.This possibility of adjustment of the drive gear 95 in the horizontal direction 98 and the driven gear of the third stage in the vertical direction 86 allows the use of different sets of gear wheels forming the gear 95, 65, 75, 85, wherein by different, matched diameter the drive ratio in total and also the relative rotational speeds of the three compressor stages 60, 70, 80 can be changed. In this case, all four gear forming gears 65, 75, 85, 95 are exchanged for such other diameter, wherein an adjustment of only two of these elements in two mutually perpendicular directions, namely the drive gear 95 in the horizontal direction 98 and the gear 85 of the third stage in the vertical direction 86, sufficient to ensure the proper engagement of the gears even with changed diameter ratios.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

  • 1 Rotorgehäuse1 rotor housing
  • 3 Rotor3 rotor
  • 5 Rotor5 rotor
  • 7 Profilabschnitt7 profile section
  • 7a Wellenzapfen7a shaft journal
  • 7b Wellenzapfen7b shaft journal
  • 7c Wellenzapfen7c shaft journal
  • 9 Profilabschnitt9 profile section
  • 9a Wellenzapfen9a shaft journal
  • 9b Wellenzapfen9b shaft journal
  • 11 Dichtungsanordnung11 sealing arrangement
  • 12 Dichtungsanordnung12 sealing arrangement
  • 13 Lager13 bearings
  • 15 Lager15 bearings
  • 17 Zahnrad17 gear
  • 19 Zahnrad19 gear
  • 21 Kühlmantel21 cooling jacket
  • 23 Deckelplatte23 cover plate
  • 25 Bodenplatte25 base plate
  • 27 Kühlraum27 refrigerator
  • 60 Schraubenkompressor60 screw compressor
  • 61 Ansaugöffnung61 intake opening
  • 63 Auslassöffnung63 outlet opening
  • 64 Flansch64 flange
  • 70 Schraubenkompressor70 screw compressor
  • 71 Einlassöffnung71 inlet opening
  • 73 Auslassöffnung73 outlet opening
  • 74 Flansch74 flange
  • 76 Ölsumpfgehäuse76 oil sump housing
  • 77 Ölleitungen77 oil pipes
  • 79 Vertiefung79 deepening
  • 80 Schraubenkompressor80 screw compressor
  • 81 Einlassöffnung81 inlet opening
  • A AchseA axis
  • B GeradeB straight
  • C GeradeC straight
  • D GeradeD straight
  • 84 Flanschplatte84 flange plate
  • 85 Zahnrad85 gear
  • 86 Doppelpfeil86 double arrow
  • 89 Gegenflansche89 counterflanges
  • 90 Getriebegehäuse90 gearbox
  • 91 Montagewand91 mounting wall
  • 92 Lagerdeckel92 bearing cover
  • 93 Lagerring93 bearing ring
  • 94 Antriebswelle94 drive shaft
  • 95 Antriebszahnrad95 drive gear
  • 97 Lagertopf97 storage pot
  • 98 Doppelpfeil98 double arrow

Claims (9)

  1. Multistage screw compressor unit comprising a transmission housing (90), a drive gear (95) arranged in the transmission housing, and a first, second and third screw compressor (60, 70, 80), which are attached to the transmission housing and coupled to the drive gear so as to all be driven together by the drive gear,
    wherein, during operation, the first screw compressor (60) compresses a flow of a gaseous fluid from an intake pressure to a first intermediate pressure, the second screw compressor (70) compresses the flow of the fluid from the first intermediate pressure to a second intermediate pressure, and the third screw compressor compresses the flow of the fluid from the second intermediate pressure to a final pressure, the final pressure being at least thirty times, preferably at least approximately forty times, the intake pressure,
    wherein the transmission housing (90) comprises a perpendicular mounting wall (91), a drive shaft (94) rotatably mounted in the transmission housing about a horizontal axis carries a drive gear (95), and the screw compressors (60, 70, 80) are attached to the mounting wall (91) so as to project in parallel with one another, and each of said screw compressors comprises two axially parallel screw rotors (3, 5) that are mutually engaged by means of helical ribs and grooves and comprises a shaft journal (7c) on one of said rotors, which journal protrudes through an opening in the mounting wall (91) into the transmission housing (90) and carries a driven gear (65, 75, 85) that meshes with the drive gear (95),
    wherein the driven gears (65, 75) of two screw compressors that form the first and second stage of the compressor unit mesh with the drive gear (95) at locations that are above the horizontal plane extending through the axis of rotation (A) of the drive gear,
    and wherein the third screw compressor (80) is arranged below the first and second screw compressor (60, 70) and its driven gear (85) meshes with the drive gear (95) at a location that is close to the deepest point (T) of the circumference of the drive gear (95).
  2. Screw compressor unit according to claim 1, characterised in that the intake pressure is approximately 1 bar, the first intermediate pressure is 2 to 6 bar, preferably approximately 3.5 bar, the second intermediate pressure is 10 to 15 bar, preferably approximately 12 bar, and the final pressure is 30 to 50 bar, preferably approximately 40 bar.
  3. Screw compressor unit according to either claim 1 or claim 2, characterised in that the first, second and third screw compressor (60, 70, 80) are each dry-running screw compressors.
  4. Compressor unit according to claim 1, characterised in that a plane (C) extending through the axis of rotation of the drive gear (95) and of the driven gear (65) of the first screw compressor forms an angle (α) of no more than 30° with the horizontal plane (B-B) extending through the axis of rotation (A) of the drive gear (95).
  5. Compressor unit according to claim 1, characterised in that a plane (C) extending through the axis of rotation of the drive gear (95) and of the driven gear (75) of the second screw compressor forms an angle (β) of no more than 20° with the horizontal plane (B-B) extending through the axis of rotation (A) of the drive gear (95).
  6. Compressor unit according to claim 1, characterised in that a plane extending through the axes of rotation of the drive gear (95) and of the driven gear (85) of the third screw compressor forms an angle (γ) of less than 30°, preferably less than 20°, with the vertical plane extending through the axis of rotation (A) of the drive gear (95).
  7. Compressor unit according to any of claims 1 to 6, characterised in that the drive shaft (94) carrying the drive gear (95) is mounted by means of interchangeable bearing parts (93, 97) having different eccentricities in the horizontal direction, in such a way that the position of the axis of rotation of the drive shaft (94) in the transmission housing (90) can be adjusted substantially in the horizontal direction (98) by changing the bearing parts.
  8. Compressor unit according to any of claims 1 to 7, characterised in that the third screw compressor (80) is attached to the mounting wall (91) by means of interchangeable flange parts (84) in such a way that the position of the third screw compressor (80) relative to the transmission housing (91) can be altered substantially in the vertical direction (86) by changing the flange parts (84).
  9. Compressor unit according to claims 7 and 8, characterised in that interchangeable wheelsets are available for changing the speed ratio of the screw compressors (60, 70, 80) of the compressor unit, which wheelsets consist, in each case, of a drive gear (95) and driven gears (65, 75, 85) of different diameters, together with associated bearing parts (93, 97) and flange parts (84) in order to set the position of the drive gear (95) in the horizontal direction (98) and of the driven gear (85) of the third screw compressor in the vertical direction (86) in a manner adapted to different diameters of the gears.
EP06754261.3A 2005-12-08 2006-06-09 Multi-step helical screw compressor unit Active EP1979618B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005058698 2005-12-08
PCT/EP2006/005558 WO2007065486A1 (en) 2005-12-08 2006-06-09 Multi-step helical screw compressor unit

Publications (2)

Publication Number Publication Date
EP1979618A1 EP1979618A1 (en) 2008-10-15
EP1979618B1 true EP1979618B1 (en) 2016-04-27

Family

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Family Applications (4)

Application Number Title Priority Date Filing Date
EP06762002A Active EP1957798B1 (en) 2005-12-08 2006-06-09 Helical screw compressor
EP06754260.5A Active EP1957797B1 (en) 2005-12-08 2006-06-09 Helical screw compressor comprising a cooling jacket
EP06754262A Withdrawn EP1957799A1 (en) 2005-12-08 2006-06-09 Helical screw compressor
EP06754261.3A Active EP1979618B1 (en) 2005-12-08 2006-06-09 Multi-step helical screw compressor unit

Family Applications Before (3)

Application Number Title Priority Date Filing Date
EP06762002A Active EP1957798B1 (en) 2005-12-08 2006-06-09 Helical screw compressor
EP06754260.5A Active EP1957797B1 (en) 2005-12-08 2006-06-09 Helical screw compressor comprising a cooling jacket
EP06754262A Withdrawn EP1957799A1 (en) 2005-12-08 2006-06-09 Helical screw compressor

Country Status (8)

Country Link
US (4) US7690901B2 (en)
EP (4) EP1957798B1 (en)
CN (2) CN101321955A (en)
AT (1) ATE498071T1 (en)
DE (1) DE502006008894D1 (en)
ES (1) ES2359015T3 (en)
HK (1) HK1127111A1 (en)
WO (4) WO2007065484A1 (en)

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Also Published As

Publication number Publication date
US7690901B2 (en) 2010-04-06
DE502006008894D1 (en) 2011-03-24
WO2007065486A1 (en) 2007-06-14
US20080286138A1 (en) 2008-11-20
US20080286129A1 (en) 2008-11-20
HK1127111A1 (en) 2009-09-18
US7713039B2 (en) 2010-05-11
CN101321955A (en) 2008-12-10
EP1957799A1 (en) 2008-08-20
US9091268B2 (en) 2015-07-28
EP1957797A1 (en) 2008-08-20
ATE498071T1 (en) 2011-02-15
WO2007065487A1 (en) 2007-06-14
EP1957798B1 (en) 2011-02-09
US20090004036A1 (en) 2009-01-01
EP1957798A1 (en) 2008-08-20
US20130011285A1 (en) 2013-01-10
ES2359015T3 (en) 2011-05-17
WO2007065485A1 (en) 2007-06-14
EP1957797B1 (en) 2016-09-28
EP1979618A1 (en) 2008-10-15
CN101321954B (en) 2012-06-13
CN101321954A (en) 2008-12-10
WO2007065484A1 (en) 2007-06-14

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