EP1399677A1 - Two-stage helical screw compressor - Google Patents

Two-stage helical screw compressor

Info

Publication number
EP1399677A1
EP1399677A1 EP02747418A EP02747418A EP1399677A1 EP 1399677 A1 EP1399677 A1 EP 1399677A1 EP 02747418 A EP02747418 A EP 02747418A EP 02747418 A EP02747418 A EP 02747418A EP 1399677 A1 EP1399677 A1 EP 1399677A1
Authority
EP
European Patent Office
Prior art keywords
housing
compressor
rotor
coolant
cooling
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.)
Granted
Application number
EP02747418A
Other languages
German (de)
French (fr)
Other versions
EP1399677B1 (en
Inventor
Carsten Dr. Achtelik
Dieter HÜTTERMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GHH Rand Schraubenkompressoren GmbH
Original Assignee
GHH Rand Schraubenkompressoren GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GHH Rand Schraubenkompressoren GmbH filed Critical GHH Rand Schraubenkompressoren GmbH
Publication of EP1399677A1 publication Critical patent/EP1399677A1/en
Application granted granted Critical
Publication of EP1399677B1 publication Critical patent/EP1399677B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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

Definitions

  • the invention relates to a two-stage screw compressor according to the preamble of claim 1.
  • a screw compressor is known, inter alia, from DE 299 22 878 U1. Reference is made in full to the disclosure of this document.
  • each of the two compressor stages projecting parallel to one another from the transmission housing is surrounded by its own cooling housing, which is connected to the coolant circuit or coolant sump by its own connections. Due to the space requirement of the cooling housings of the two compressor stages mentioned, the design of the known screw compressor is not particularly compact.
  • a screw compressor with two compressor stages is known, the compressor housing of which is arranged parallel to one another and surrounded by a common inner housing.
  • the inner housing is concentrically surrounded by an outer housing, and the annular space between the inner and outer housing is divided into chambers through which a coolant flows in order to cool tube bundles arranged in the chambers and through which the compressed gas flows.
  • a first coolant stream cools the compressed gas of the first compressor stage
  • a second coolant stream cools the compressed gas of the second compressor stage.
  • the coolant has essentially no direct cooling effect on the rotor housing of the two compressor stages.
  • the object of the invention is to provide a two-stage screw compressor of the type specified with a particularly compact design, in which the manufacture is further simplified and the utilization of the cooling effect of the coolant circuit is improved.
  • the achievement of the object is specified in claim 1.
  • the dependent claims relate to further advantageous features of the invention.
  • the rotor housings of both compressor stages are arranged in a common cooling housing which surrounds them at a distance and are preferably produced in one piece with the cooling housing.
  • the cooling housing has only one coolant inlet and one coolant outlet and is designed so that a flow path is forced on the coolant, which flows around and cools both rotor housings of the compressor stages in succession. This results in a particularly compact design and, at the same time, simplification of the manufacture of the screw compressor and improved utilization of the coolant.
  • FIG. 1 is a perspective view of a screw compressor according to an embodiment of the invention
  • FIG. 2 is a side view of a screw compressor according to an embodiment of the invention in the direction of arrow A in Fig. 3,
  • Fig. 3 is an end view of the screw connector in the direction of the arrow
  • FIG. 3 A side view in the direction of arrow C in FIG. 3,
  • FIG. 5 is a plan view of the screw compressor according to FIG. 2,
  • FIG. 6 is a perspective view of the cooling housing of the screw compressor with Blicl ⁇ linkschtung from top left,
  • FIG. 7 is a perspective view of the cooling housing according to FIG. 6, but in the direction from the bottom right,
  • FIG. 8 shows a cross section perpendicular to the axis through the cooling housing and the compressor stages according to the section line and the viewing direction of the arrows D-D from FIG. 4.
  • the two-stage screw compressor shown in FIGS. 1 to 5 has a housing 1 which is provided with feet 3 for attachment to a base.
  • the upper part 5 of the housing 1 has essentially the shape of a disk-shaped stand with two vertical end walls.
  • a cooling housing 7 is freely cantilevered on the left end wall in FIG. 2.
  • the cooling housing 7 surrounds two compressor stages arranged in its interior, each consisting of a rotor housing and two screw rotors arranged therein that mesh with one another, as will be explained with reference to FIG. 7. From the lower part of the housing 1 protrudes below the cooling housing 7 and at a distance from it, an oil reservoir 9, which can also have feet 3 for support on the base.
  • a drive unit 13 On the side of the upper housing area 5 facing away from the cooling housing 7, a drive unit 13 is provided with a preferably speed-controlled motor, which drives the screw rotors of the compressor stages via a gearbox housed in the housing section 5.
  • the drive motor 13 can also drive an oil pump, which is arranged in a housing area 14 between the drive unit 13 and the branching gear in the housing area 5.
  • the screw compressor shown is preferably a dry-running screwdriver compressor, ie the actual compressor chamber with the screw actuators located therein is kept oil-free.
  • the oil kept in circulation by the oil pump serves on the one hand to lubricate the transmission and the roller bearings of the screw rotors and on the other hand as a coolant for external cooling of the rotor housing of the two compressor stages.
  • the part of the screw compressor to which the invention mainly relates namely the cooling housing 7 with the compressor stages arranged therein, is shown in perspective in FIGS. 6 and 7 from two different viewing directions and in FIG. 8 in section.
  • cooling housing 7 inside the cooling housing 7 there is a first compressor stage 15 (low-pressure stage) with two interlocking screw rotors 17, 19, which are mounted in a rotor housing 21 with an 8-shaped cross section, and a second compressor stage 23 (high-pressure stage) 23 parallel to them with a pair of screw rotors 25, 27, which are mounted in an 8-shaped rotor housing 29.
  • the cooling housing 7 is box-shaped with an essentially rectangular cross section, so that it has two side walls 31, 35 parallel to the rotors 17, 19, 25, 27, an upper side 37 and a lower side 39.
  • the cooling housing 7 has openings on the top and bottom which are closed by screwed-on plates 41, 43, 47.
  • the cooling housing 7 merges into a large-area flange 49, which is used to fasten the cooling housing 7 to the gear housing 5 and has an outer contour adapted to it.
  • the cooling housing 7 is closed at the end by a bearing cover 51 which is fastened to the cooling housing 7 with screws.
  • the inlet opening 57 for sucking in the gas to be compressed in the compression space in the rotor housing 21 of the first compressor stage 15.
  • the outlet 59 for the gas compressed in the first stage is in the right one in FIG. 7 (in Fig. 8 left) side wall 31.
  • On the underside 39 of the cooling housing 7 there is the inlet opening 61 for the second compressor stage 23 (high pressure stage).
  • the outlet opening 63 of the second compressor stage 23 is located in the left-hand side wall 35 in FIG. 6 (right in FIG. 8).
  • the outlet opening 59 of the low-pressure stage is usually connected to the inlet opening 61 of the high-pressure stage via an intercooler (in the drawings not shown).
  • the filters and / or silencers upstream of the suction opening 57 of the low pressure stage and the silencers, coolers and / or filters downstream of the outlet 63 of the high pressure stage are also not shown.
  • These devices can be of any design known to those skilled in the art.
  • on each of the four sides 31, 35, 37, 39 of the cooling housing 7 is one of the four connections of the two compressor stages (inlet and outlet ports 57, 59 of the low pressure stage 15, inlet and outlet ports 61, 63 of the high pressure stage) 23) arranged, resulting in a compact design with good utilization of the space available on the four sides of the housing 7.
  • the rotor housings 21, 29 of the two compressor stages 15, 23 are arranged at a sufficient distance from the walls of the cooling housing 7.
  • a cooling medium circulates to cool the two compressor stages 23, 15 together.
  • the cooling housing 7 has an inlet opening 65 for the cooling medium on the underside 39 and an outlet opening 67 for the cooling medium in the upper region of the side wall 35.
  • the coolant supplied at the opening 65 flows through the cooling housing 7 to the outlet opening 67 on an S-shaped flow path, which is indicated by the dash-dotted line 69.
  • This flow path is forced by baffles 71, 73 which extend at suitable points through the space between the rotor housings 21, 29 and the cooling housing 7.
  • the flow path 69 first flows around the rotor housing 21 of the low-pressure stage 15 and then the rotor housing 29 of the high-pressure stage 23, in each case over an "encircling angle" of more than 180 °, preferably almost 360 °.
  • the rotor housings 21, 29 of the compressor stages, the guide walls 71, 73 and the cooling housing 7 are preferably produced as a one-piece housing block, as indicated by the uniform hatching in FIG. 8.

Abstract

A two-stage screw compressor has two compressor stages whose rotor housings are arranged with their axes parallel to one another and are enclosed by a common coolant housing at a distance. A coolant inlet and a coolant outlet are located at the common coolant housing, as well as guide walls such that the coolant flowing through the coolant housing flows around and cools the rotor housings of the two compressor stages one after the other in an S-shaped flow path.

Description

Zweistufiger Schraubenkompressor Two-stage screw compressor
Die Erfindung betrifft einen zweistufigen Schraubenkompressor gemäß dem Oberbegriff des Anspruchs 1. Ein solcher Schraubenlcompressor ist unter anderem aus DE 299 22 878 Ul bekannt. Auf die Offenbarung dieser Druckschrift wird in vollem Umfang Bezug genommen.The invention relates to a two-stage screw compressor according to the preamble of claim 1. Such a screw compressor is known, inter alia, from DE 299 22 878 U1. Reference is made in full to the disclosure of this document.
Bei diesem bekannten zweistufigen Schraubenkompressor ist jede der beiden parallel zueinander vom Getriebegehäuse auskragenden Verdichterstufen von einem eigenen Kühlgehäuse umgeben, welches durch eigene Anschlüsse mit dem Kühlmittelkreislauf bzw. Kühlmittelsumpf verbunden ist. Aufgrund des Platzbedarfs der genannten Kühlgehäuse der beiden Verdichterstufen ist die Bauweise des bekannten Schraubenkompressors nicht besonders kompakt.In this known two-stage screw compressor, each of the two compressor stages projecting parallel to one another from the transmission housing is surrounded by its own cooling housing, which is connected to the coolant circuit or coolant sump by its own connections. Due to the space requirement of the cooling housings of the two compressor stages mentioned, the design of the known screw compressor is not particularly compact.
Aus US-A-4,174,196 ist ein Schraubenkompressor mit zwei Verdichterstufen bekannt, deren Verdichtergehäuse parallel zueinander angeordnet und von einem gemeinsamen Innengehäuse umgeben sind. Das Innengehäuse ist konzentrisch von einem Außengehäuse umgeben, und der Ringraum zwischen Innen- und Außengehäuse ist in Kammern unterteilt, die von einem Kühlmittel durchströmt werden, um in den Kammern angeordnete Rohrbündel, durch die das verdichtete Gas strömt, zu kühlen. Ein erster Kühlmittelstrom kühlt das verdichtete Gas der ersten Verdichterstufe, ein zweiter Kühlmittelstrom das verdichtete Gas der zweiten Verdichterstufe. Das Kühlmittel hat im wesentlichen keine direkte Kühlwirkung auf die Rotorgehäuse der beiden Verdichterstufen.From US-A-4,174,196 a screw compressor with two compressor stages is known, the compressor housing of which is arranged parallel to one another and surrounded by a common inner housing. The inner housing is concentrically surrounded by an outer housing, and the annular space between the inner and outer housing is divided into chambers through which a coolant flows in order to cool tube bundles arranged in the chambers and through which the compressed gas flows. A first coolant stream cools the compressed gas of the first compressor stage, a second coolant stream cools the compressed gas of the second compressor stage. The coolant has essentially no direct cooling effect on the rotor housing of the two compressor stages.
Aufgabe der Erfindung ist es, einen zweistufigen Schraubenkompressor der angegebenen Art mit besonders kompakter Bauweise zur Verfügung zu stellen, bei dem ferner die Herstellung vereinfacht und die Ausnutzung der Kühlwirkung des Kühlmittelkreislaufs verbessert wird. Die erfindungsgemäße Lösung der Aufgabe ist im Anspruch 1 angegeben. Die abhängigen Ansprüche beziehen sich auf weitere vorteilhafte Merkmale der Erfindung.The object of the invention is to provide a two-stage screw compressor of the type specified with a particularly compact design, in which the manufacture is further simplified and the utilization of the cooling effect of the coolant circuit is improved. The achievement of the object is specified in claim 1. The dependent claims relate to further advantageous features of the invention.
Erfindungsgemäß sind die Rotorgehäuse beider Verdichterstufen in einem gemeinsamen, sie mit Abstand umgebenden Kühlgehäuse angeordnet und vorzugsweise einstük- kig mit dem Kühlgehäuse hergestellt. Das Kühlgehäuse weist nur einen Kühlmitteleinlaß und einen Kühlmittelauslaß auf und ist so ausgebildet, daß dem Kühlmittel ein Strömungsweg aufgezwungen wird, der nacheinander beide Rotorgehäuse der Verdichterstufen umspült und kühlt. Hierdurch wird eine besonders kompakte Bauweise sowie gleichzeitig eine Vereinfachung der Herstellung des Schraubenverdichters und eine verbesserte Ausnutzung des Kühlmittels erzielt.According to the invention, the rotor housings of both compressor stages are arranged in a common cooling housing which surrounds them at a distance and are preferably produced in one piece with the cooling housing. The cooling housing has only one coolant inlet and one coolant outlet and is designed so that a flow path is forced on the coolant, which flows around and cools both rotor housings of the compressor stages in succession. This results in a particularly compact design and, at the same time, simplification of the manufacture of the screw compressor and improved utilization of the coolant.
Eine weitere Möglichkeit zur besonders kompakten Ausbildung des Schraubenkompressors ergibt sich, wenn an jeder der vier Seiten des kastenförmigen Kühlgehäuses je einer der vier Anschlüsse der beiden Verdichterstufen (Ein- und Auslaß der Niederdruckstufe, Ein- und Auslaß der Hochdruckstufe) angeordnet ist. Es kann dann der auf jeder der Seitenflächen des Kühlgehäuses vorhandene Platz optimal für den jeweiligen dort angeordneten Anschluß genutzt werden, ohne durch einen weiteren Anschluß auf derselben Seite behindert zu sein.Another possibility for the particularly compact design of the screw compressor is obtained if one of the four connections of the two compressor stages (inlet and outlet of the low pressure stage, inlet and outlet of the high pressure stage) is arranged on each of the four sides of the box-shaped cooling housing. The space available on each of the side surfaces of the cooling housing can then be optimally used for the respective connection arranged there without being hindered by a further connection on the same side.
Eine Ausführungsform der Erfindung wird anhand der Zeichnungen näher erläutert. Es zeigt:An embodiment of the invention is explained in more detail with reference to the drawings. It shows:
Fig. 1 eine perspektivische Ansicht eines Schraubenkompressors gemäß einer Ausführungsform der Erfindung,1 is a perspective view of a screw compressor according to an embodiment of the invention,
Fig. 2 eine Seitenansicht eines Schraubenkompressors gemäß einer Ausführungsform der Erfindung in der Blicl richtung des Pfeiles A in Fig. 3,2 is a side view of a screw compressor according to an embodiment of the invention in the direction of arrow A in Fig. 3,
Fig. 3 eine Stirnansicht des Schraubenkonipressors in der Blickrichtung des PfeilesFig. 3 is an end view of the screw connector in the direction of the arrow
B von Fig. 2, Fig. 4 eine Seitenansicht in der Blickrichtung des Pfeiles C in Fig. 3,B of Fig. 2, 4 is a side view in the direction of arrow C in FIG. 3,
Fig. 5 eine Draufsicht auf den Schraubenkompressor gemäß Fig. 2,5 is a plan view of the screw compressor according to FIG. 2,
Fig. 6 eine perspektivische Darstellung des Kühlgehäuses des Schraubenkompressors mit Bliclαϊchtung von oben links,6 is a perspective view of the cooling housing of the screw compressor with Bliclα linkschtung from top left,
Fig. 7 eine perspektivische Darstellung des Kühlgehäuses gemäß Fig. 6, jedoch in der Blicl richtung von unten rechts,7 is a perspective view of the cooling housing according to FIG. 6, but in the direction from the bottom right,
Fig. 8 einen achssenkrechten Querschnitt durch das Kühl-gehäuse und die Verdichterstufen gemäß der Schnittlinie und der Blickrichtung der Pfeile D-D von Fig. 4.8 shows a cross section perpendicular to the axis through the cooling housing and the compressor stages according to the section line and the viewing direction of the arrows D-D from FIG. 4.
Der in Fig. 1 bis 5 dargestellte zweistufige Schraubenkompressor hat ein Gehäuse 1, das mit Füßen 3 zur Befestigung an einer Unterlage versehen ist. Der obere Teil 5 des Gehäuses 1 hat im wesentlichen die Form eines scheibenförmigen Ständers mit zwei vertikalen Stirnwänden. An der in Fig. 2 linken Stirnwand ist frei auskragend ein Kühlgehäuse 7 angebracht. Das Kühlgehäuse 7 umgibt zwei in seinem Innern angeordnete Verdichterstufen, jede bestehend aus einem Rotorgehäuse und zwei darin angeordneten, miteinander kämmenden Schraubenrotoren, wie anhand von Fig. 7 noch erläutert wird. Vom unteren Teil des Gehäuses 1 ragt unterhalb des Kühlgehäuses 7 und mit Abstand zu diesem ein Ölvorratsbehälter 9 heraus, der ebenfalls Füße 3 zum Abstützen auf der Unterlage aufweisen kann. Auf der dem Kühlgehäuse 7 abgewandten Seite des oberen Gehäusebereichs 5 ist eine Antriebseinheit 13 vorgesehen mit einem vorzugsweise drehzahlgeregeltem Motor, der über ein im Gehäuseabschnitt 5 untergebrachtes Getriebe die Schraubenrotoren der Verdichterstufen antreibt. Der Antriebsmotor 13 kann ferner eine Ölpumpe antreiben, die in einem Gehäusebereich 14 zwischen der Antriebseinheit 13 und dem Verzweigungsgetriebe im Gehäusebereich 5 angeordnet ist. Bei dem dargestellten Schraubenkompressor handelt es sich vorzugsweise um einen trockenlaufenden Schrauberύcorαpressor, d.h. der eigentliche Verdichterraum mit den darin befindlichen SchraubeniOtoren wird ölfrei gehalten. Das von der Ölpumpe in Zirkulation gehaltene Öl dient einerseits zur Schmierung des Getriebes und der Wälzlager der Schraubenrotoren und andererseits als Kühlmittel zur äußeren Kühlung der Rotorgehäuse der beiden Verdichterstufen.The two-stage screw compressor shown in FIGS. 1 to 5 has a housing 1 which is provided with feet 3 for attachment to a base. The upper part 5 of the housing 1 has essentially the shape of a disk-shaped stand with two vertical end walls. A cooling housing 7 is freely cantilevered on the left end wall in FIG. 2. The cooling housing 7 surrounds two compressor stages arranged in its interior, each consisting of a rotor housing and two screw rotors arranged therein that mesh with one another, as will be explained with reference to FIG. 7. From the lower part of the housing 1 protrudes below the cooling housing 7 and at a distance from it, an oil reservoir 9, which can also have feet 3 for support on the base. On the side of the upper housing area 5 facing away from the cooling housing 7, a drive unit 13 is provided with a preferably speed-controlled motor, which drives the screw rotors of the compressor stages via a gearbox housed in the housing section 5. The drive motor 13 can also drive an oil pump, which is arranged in a housing area 14 between the drive unit 13 and the branching gear in the housing area 5. The screw compressor shown is preferably a dry-running screwdriver compressor, ie the actual compressor chamber with the screw actuators located therein is kept oil-free. The oil kept in circulation by the oil pump serves on the one hand to lubricate the transmission and the roller bearings of the screw rotors and on the other hand as a coolant for external cooling of the rotor housing of the two compressor stages.
Bezüglich der Einzelheiten des Antriebs mit dem drehzahlgeregelten Antriebsmotor, des Verzweigungsgetriebes und der Integration der Ölpumpe in das Gehäuse wird im vollen Umfang auf die bereits genannte DE 29922 878 Ul verwiesen. Das gilt auch für weitere, in dieser Schrift offenbarte vorteilhafte Merkmale, die auch bei dem Schraubenkompressor gemäß der vorliegenden Erfindung angewendet werden können, wie die innenliegend integrierte Ölpumpe, die keine Abdichtung erforderlich macht, die direkte An- kopplung des Motors an den Antriebszapfen des Getriebes, ohne die bisher übliche, platzbeanspruchende Kupplung, sowie die Auslegung des vom Motor angetriebenen Getriebes derart, daß innerhalb eines vorgegebenen Drehzahlbereiches des Motors, z.B. zwischen 2500 und 5500 U/Min ein optimierter Wirkungsgrad erreicht wird.With regard to the details of the drive with the speed-controlled drive motor, the branching gear and the integration of the oil pump in the housing, reference is made in full to the aforementioned DE 29922 878 U1. This also applies to further advantageous features disclosed in this document, which can also be used in the screw compressor according to the present invention, such as the oil pump integrated on the inside, which does not require a seal, and the direct coupling of the motor to the drive journal of the transmission , without the previously usual, space-consuming clutch, and the design of the gear driven by the engine such that within a predetermined speed range of the engine, for example an optimized efficiency is achieved between 2500 and 5500 rpm.
Der Teil des Schraubenkompressors, auf den sich die Erfindung hauptsächlich bezieht, nämlich das Kühlgehäuse 7 mit den darin angeordneten Verdichterstufen, ist in Fig. 6 und 7 perspektivisch aus zwei verschiedenen Blickrichtungen und in Fig. 8 im Schnitt dargestellt.The part of the screw compressor to which the invention mainly relates, namely the cooling housing 7 with the compressor stages arranged therein, is shown in perspective in FIGS. 6 and 7 from two different viewing directions and in FIG. 8 in section.
Gemäß Fig. 8 befindet sich im Inneren des Kühlgehäuses 7 eine erste Verdichterstufe 15 (Niederdruckstufe) mit zwei ineinandergreifenden Schraubenrotoren 17, 19, die in einem im Querschnitt 8-förmigen Rotorgehäuse 21 gelagert sind, und achsparallel dazu eine zweite Verdichterstufe 23 (Hochdruckstufe) 23 mit einem Paar Schraubenrotoren 25, 27, die einem 8-förmigen Rotorgehäuse 29 gelagert sind. Das Kühlgehäuse 7 ist kastenförmig mit einem im wesentlichen rechteckigen Querschnitt, so daß es zwei zu den Rotoren 17, 19, 25, 27 parallele Seitenwände 31, 35, eine Oberseite 37 und eine Unterseite 39 aufweist.According to FIG. 8, inside the cooling housing 7 there is a first compressor stage 15 (low-pressure stage) with two interlocking screw rotors 17, 19, which are mounted in a rotor housing 21 with an 8-shaped cross section, and a second compressor stage 23 (high-pressure stage) 23 parallel to them with a pair of screw rotors 25, 27, which are mounted in an 8-shaped rotor housing 29. The cooling housing 7 is box-shaped with an essentially rectangular cross section, so that it has two side walls 31, 35 parallel to the rotors 17, 19, 25, 27, an upper side 37 and a lower side 39.
An der Oberseite und Unterseite weist das Kühlgehäuse 7 Öffnungen auf, die durch aufgeschraubte Platten 41, 43, 47 verschlossen sind.The cooling housing 7 has openings on the top and bottom which are closed by screwed-on plates 41, 43, 47.
An einem seiner Enden geht das Kühlgehäuse 7 in einen großflächigen Flansch 49 über, der zur Befestigung des Kühlgehäuses 7 an dem Getriebegehäuse 5 dient und eine daran angepaßte Außenkontur aufweist. Am anderen Ende ist das Kuhlgehause 7 stirnseitig durch einen Lagerdeckel 51 abgeschlossen, der mit Schrauben am Kühlgehäuse 7 befestigt ist. An der Unterseite des Lagerdeckels 51 befindet sich ein Ölablaufstutzen 53, der über eine Rücklaufleitung 55 (Fig. 1 - 5) mit dem Ölvorratsbehälter 9 verbunden ist.At one of its ends, the cooling housing 7 merges into a large-area flange 49, which is used to fasten the cooling housing 7 to the gear housing 5 and has an outer contour adapted to it. At the other end, the cooling housing 7 is closed at the end by a bearing cover 51 which is fastened to the cooling housing 7 with screws. On the underside of the bearing cover 51 there is an oil drain socket 53 which is connected to the oil reservoir 9 via a return line 55 (FIGS. 1-5).
An der Oberseite des Kühlgehäuses 7 befindet sich die Einlaßöffhung 57 zum Ansaugen des zu verdichtenden Gases in dem Verdichtungsraum im Rotorgehäuse 21 der ersten Verdichterstufe 15. Der Auslaß 59 für das in der ersten Stufe verdichtete Gas befindet sich in der in Fig. 7 rechten (in Fig. 8 linken) Seitenwand 31. An der Unterseite 39 des Kühlgehäuses 7 befindet sich die Einlaßöffhung 61 für die zweite Verdichterstufe 23 (Hochdruckstufe). Die Auslaßöffnung 63 der zweiten Verdichterstufe 23 befindet sich in der in Fig. 6 linken (in Fig. 8 rechten) Seitenwand 35. Die Auslaßöff ung 59 der Niederdruckstufe ist mit der Einlaßöffnung 61 der Hochdruckstufe in der Regel über einen Zwischenkühler verbunden (in den Zeichnungen nicht dargestellt). Ebenfalls nicht dargestellt sind die der Ansaug-öffhung 57 der Niederdruckstufe vorgeschalteten Filter und/oder Schalldämpfer sowie die dem Auslaß 63 der Hochdruckstufe nachgeschalteten Schalldämpfer, Kühler und/oder Filter. Diese Einrichtungen können von beliebiger, dem Fachmann bekannter Bauweise sein. Bei der beschriebenen Ausführangsform ist an jeder der vier Seiten 31, 35, 37, 39 des Kühlgehäuses 7 je einer der insgesamt vier Anschlüsse der beiden Verdichterstufen (Ein- und Austrittsstutzen 57, 59 der Niederdruckstufe 15, Ein- und Austrittsstutzen 61, 63 der Hochdruckstufe 23) angeordnet, wodurch sich eine kompakte Bauweise mit guter Ausnutzung des an den vier Seiten des Gehäuses 7 vorhandenen Platzes ergibt.At the top of the cooling housing 7 there is the inlet opening 57 for sucking in the gas to be compressed in the compression space in the rotor housing 21 of the first compressor stage 15. The outlet 59 for the gas compressed in the first stage is in the right one in FIG. 7 (in Fig. 8 left) side wall 31. On the underside 39 of the cooling housing 7 there is the inlet opening 61 for the second compressor stage 23 (high pressure stage). The outlet opening 63 of the second compressor stage 23 is located in the left-hand side wall 35 in FIG. 6 (right in FIG. 8). The outlet opening 59 of the low-pressure stage is usually connected to the inlet opening 61 of the high-pressure stage via an intercooler (in the drawings not shown). Also not shown are the filters and / or silencers upstream of the suction opening 57 of the low pressure stage and the silencers, coolers and / or filters downstream of the outlet 63 of the high pressure stage. These devices can be of any design known to those skilled in the art. In the embodiment described, on each of the four sides 31, 35, 37, 39 of the cooling housing 7 is one of the four connections of the two compressor stages (inlet and outlet ports 57, 59 of the low pressure stage 15, inlet and outlet ports 61, 63 of the high pressure stage) 23) arranged, resulting in a compact design with good utilization of the space available on the four sides of the housing 7.
Wie in Fig. 8 erkennbar, sind die Rotorgehäuse 21, 29 der beiden Verdichterstufen 15, 23 mit ausreichendem Abstand von den Wänden des Kühlgehäuses 7 angeordnet. In dem dadurch gebildeten Zwischenraum zirkuliert ein Kühlmedium zur gemeinsamen Kühlung der beiden Verdichterstufen 23, 15. Zu diesem Zweck weist das Kühlgehäuse 7 an der Unterseite 39 eine Einlaßöffhung 65 für das Kühlmedium und im oberen Bereich der Seitenwand 35 eine Auslaßöffnung 67 für das Kühlmedium auf. Das bei der Öffnung 65 zugeführte Kühlmittel strömt durch das Kühlgehäuse 7 zur Austrittsöffnung 67 auf einem S-förmigen Strömungsweg, der durch die strichpunktierte Linie 69 angedeutet ist. Dieser Strömungsweg wird durch Leitwände 71, 73 erzwungen, die sich an geeigneten Stellen durch den Zwischenraum zwischen den Rotorgehäusen 21, 29 und dem Kühlgehäuse 7 erstrecken. Der Strömungsweg 69 umströmt zuerst das Rotorgehäuse 21 der Niederdruckstufe 15 und dann das Rotorgehäuse 29 der Hochdruckstufe 23, und zwar jeweils über einen "UmscMingungswinkel" von mehr als 180°, vorzugsweise nahezu 360°.As can be seen in FIG. 8, the rotor housings 21, 29 of the two compressor stages 15, 23 are arranged at a sufficient distance from the walls of the cooling housing 7. In the intermediate space thus formed, a cooling medium circulates to cool the two compressor stages 23, 15 together. For this purpose, the cooling housing 7 has an inlet opening 65 for the cooling medium on the underside 39 and an outlet opening 67 for the cooling medium in the upper region of the side wall 35. The coolant supplied at the opening 65 flows through the cooling housing 7 to the outlet opening 67 on an S-shaped flow path, which is indicated by the dash-dotted line 69. This flow path is forced by baffles 71, 73 which extend at suitable points through the space between the rotor housings 21, 29 and the cooling housing 7. The flow path 69 first flows around the rotor housing 21 of the low-pressure stage 15 and then the rotor housing 29 of the high-pressure stage 23, in each case over an "encircling angle" of more than 180 °, preferably almost 360 °.
Vorzugsweise sind die Rotorgehäuse 21, 29 der Verdichterstufen, die Leitwände 71, 73 und das Kühlgehäuse 7 als ein einstückiger Gehäuseblock hergestellt, wie durch die einheitliche Schraffur in Fig. 8 angedeutet. The rotor housings 21, 29 of the compressor stages, the guide walls 71, 73 and the cooling housing 7 are preferably produced as a one-piece housing block, as indicated by the uniform hatching in FIG. 8.

Claims

Ansprüche Expectations
1. Zweistufiger Schraubenkompressor mit zwei parallel zueinander angeordneten Verdichterstufen (15, 23), jede bestehend aus einem Paar von miteinander kämmenden Schraubenrotoren (17, 19; 25, 27), das in einem Rotorgehäuse (21, 29) angeordnet ist, wobei jedes der beiden Rotorgehäuse von einem Kühlgehäuse umgeben und durch in dem Kühlgehäuse strömendes Kühlmittel gekühlt ist, dadurch gekennzeichnet, daß beide Rotorgehäuse (21, 29) von einem gemeinsamen Kühlgehäuse (7) mit Abstand umgeben sind und daß das Kuhlgehause (7) einen Kühlmitteleinlaß (65) und einem Kühlmittelauslaß (67) derart aufweist, daß das vom Einlaß zum Auslaß strömende Kühlmittel beide Rotorgehäuse (21, 29) umspült und kühlt.1. Two-stage screw compressor with two mutually parallel compressor stages (15, 23), each consisting of a pair of intermeshing screw rotors (17, 19; 25, 27), which is arranged in a rotor housing (21, 29), each of the the two rotor housings are surrounded by a cooling housing and are cooled by coolant flowing in the cooling housing, characterized in that both rotor housings (21, 29) are surrounded by a common cooling housing (7) and that the cooling housing (7) has a coolant inlet (65) and a coolant outlet (67) such that the coolant flowing from the inlet to the outlet rinses and cools both rotor housings (21, 29).
2. Schraubenkompressor nach Anspruch 1 , dadurch gekennzeichnet, daß das Kühlmittel auf seinem Strömungsweg vom Einlaß (65) zum Auslaß (67) im wesentlichen zuerst das eine Rotorgehäuse (21) und dann das andere Rotorgehäuse (29) umspült und kühlt.2. Screw compressor according to claim 1, characterized in that the coolant on its flow path from the inlet (65) to the outlet (67) essentially rinses and cools the one rotor housing (21) and then the other rotor housing (29).
3. Schraubenkompressor nach Anspruch 2, dadurch gekennzeichnet, daß das Kühlmittel zuerst das Rotorgehäuse (21) der ersten Verdichterstufe (15) (Niederdruckstufe) und dann das Rotorgehäuse (29) der zweiten Verdichterstufe (23) (Hoch- druckstufe) umströmt.3. Screw compressor according to claim 2, characterized in that the coolant flows around the rotor housing (21) of the first compressor stage (15) (low pressure stage) and then the rotor housing (29) of the second compressor stage (23) (high pressure stage).
4. Schraubenlcompressor nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Strömungsweg (69) des Kühlmediums S-förmig erst um die eine (23) und dann um die andere Verdichterstufe (15) herum verläuft. 4. Screw compressor according to one of claims 1 to 3, characterized in that the flow path (69) of the cooling medium is S-shaped only around one (23) and then around the other compressor stage (15).
5. Scliraubenlcompressor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Zwischenraum zwischen dem Kühlgehäuse (7) und den Rotorgehäusen (21, 29) durch Leitwände (71, 73) unterteilt ist, die dem Kühlmedium den gewünschten Strömungsweg (69) aufzwingen.5. Scliraubenlcompressor according to one of claims 1 to 4, characterized in that the space between the cooling housing (7) and the rotor housing (21, 29) is divided by guide walls (71, 73) which the cooling medium the desired flow path (69) imposition.
6. Schraubenkompressor nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Rotorgehäuse (21, 29) mit mindestens einem Teil des Kühlgehäuses (7) einstückig als integraler Block ausgebildet sind.6. Screw compressor according to one of claims 1 to 5, characterized in that the rotor housing (21, 29) with at least part of the cooling housing (7) are integrally formed as an integral block.
7. Schraubenkompressor nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Kühlgehäuse (7) im wesentlichen kastenförmig ausgebildet ist mit vier zu den Rotorachsen der Verdichterstufen parallelen Seiten (33,35, 37, 39), und daß von den vier Anschlüssen (57, 59, 61, 63) der Verdichterstufen (15, 23) (Ein- und Auslaß der Niederdruckstufe, Ein- und Auslaß der Hochdruckstufe) je ein Anschluß an jeder Seite des Kühlgehäuses (7) angeordnet ist. 7. Screw compressor according to one of claims 1 to 6, characterized in that the cooling housing (7) is substantially box-shaped with four parallel to the rotor axes of the compressor stages sides (33,35, 37, 39), and that of the four connections (57, 59, 61, 63) of the compressor stages (15, 23) (inlet and outlet of the low-pressure stage, inlet and outlet of the high-pressure stage) a connection is arranged on each side of the cooling housing (7).
EP02747418A 2001-06-22 2002-06-20 Two-stage helical screw compressor Expired - Lifetime EP1399677B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20110360U 2001-06-22
DE20110360U DE20110360U1 (en) 2001-06-22 2001-06-22 Two-stage screw compressor
PCT/EP2002/006853 WO2003001064A1 (en) 2001-06-22 2002-06-20 Two-stage helical screw compressor

Publications (2)

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EP1399677A1 true EP1399677A1 (en) 2004-03-24
EP1399677B1 EP1399677B1 (en) 2006-08-16

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EP02747418A Expired - Lifetime EP1399677B1 (en) 2001-06-22 2002-06-20 Two-stage helical screw compressor

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US (1) US6991440B2 (en)
EP (1) EP1399677B1 (en)
JP (1) JP2004530836A (en)
CN (1) CN1273744C (en)
AT (1) ATE336659T1 (en)
DE (2) DE20110360U1 (en)
ES (1) ES2271293T3 (en)
WO (1) WO2003001064A1 (en)

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US20040062668A1 (en) 2004-04-01
CN1463331A (en) 2003-12-24
DE20110360U1 (en) 2002-10-31
CN1273744C (en) 2006-09-06
WO2003001064A1 (en) 2003-01-03
ATE336659T1 (en) 2006-09-15
ES2271293T3 (en) 2007-04-16
EP1399677B1 (en) 2006-08-16
DE50207867D1 (en) 2006-09-28
US6991440B2 (en) 2006-01-31
JP2004530836A (en) 2004-10-07

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