EP0404921A1 - Rotor pair for a high-pressure screw-type compressor. - Google Patents
Rotor pair for a high-pressure screw-type compressor.Info
- Publication number
- EP0404921A1 EP0404921A1 EP19900901801 EP90901801A EP0404921A1 EP 0404921 A1 EP0404921 A1 EP 0404921A1 EP 19900901801 EP19900901801 EP 19900901801 EP 90901801 A EP90901801 A EP 90901801A EP 0404921 A1 EP0404921 A1 EP 0404921A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- teeth
- secondary rotor
- main
- pressure
- 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
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
Definitions
- the invention relates to a pair of rotors for a high-pressure screw compressor, which consists of a main rotor and a secondary rotor, the main rotor having teeth that are essentially convex outside of its pitch circle and the side rotor having teeth that are essentially concave inside its pitch circle, both rotors being screwed in opposite directions and each other the screwing angles of the opposite end faces from the main rotor to the secondary rotor behave like the number of teeth from the main rotor to the secondary rotor and the tooth gaps from the main and secondary rotor form communicating V-shaped working chambers, in which the working cycle suction, compression, ejection takes place due to the rotation of the rotors and thereby There are pressure differences on the rotors, which lead to action forces on the bearings.
- the rotors are coaxially mounted in support bearings and thrust bearings. Characteristic of the known prior art
- Combinations of teeth with a difference in the number of secondary rotor teeth minus the number of main rotor teeth from -1 to +2 are used, which means that the load capacity of the support bearings, especially the secondary rotor, is relatively limited due to the small center distance of the rotors.
- the aim of the invention is to expand the field of use of the screw compressor with regard to higher operating pressures with good energy-economic indicators and low manufacturing costs.
- the object of the invention is to increase the center distance by changing the main dimensions of the rotors and to improve the internal tightness of the screw compressor in relation to the tooth space volume and in relation to the temporal size of a work cycle.
- the object of the invention is achieved in that the center distance, which limits the size of the possible bearings, is increased only by increasing the number of secondary rotor teeth.
- a pair of rotors for a high-pressure screw compressor has a secondary rotor which has at least 3 teeth more than the main rotor, the difference in the number of teeth depending on the maximum operating pressure and being so great that the increased action force on the pressure-side support bearing associated with the increase in the number of teeth on the secondary rotor of the secondary rotor is smaller than the load-bearing capacity of the largest possible support bearing, which is due to the enlargement of the center distance due to the size of the secondary rotor teeth.
- the angle of de-icing of the secondary rotor is reduced to 50% of the main rotor, while the center distance increases by 23% compared to a combination of 4 to 6, so that a roller bearing as a support bearing at the secondary rotor shaft end with a 40 to 50% higher load capacity (basis for comparison: bearing outer diameter for the secondary rotor equals the center distance), while the action force at this point only increases by 8% at a maximum operating pressure of 3.5 MPa if the secondary rotor teeth count increases from 6 8 is increased.
- the inner gaps are positively influenced by the increase in the number of secondary rotor teeth, since the bearing play and thermal expansion of the rotor are in opposite directions.
- Another feature of the invention relates to the size of the screwing angle of the main rotor, which is determined as a function of the peripheral speed. There is between the screw angle and the circumference
- the distance between the rotors of a screw compressor, which limits the size of the possible bearings, is achieved by the size of the secondary rotor teeth.
- the secondary rotor has at least 3 teeth more than the main rotor. When designing the number of teeth for the main rotor to lifting rotor from 4 to 8, the screwing angle of the secondary rotor is reduced to 50 percent of the main rotor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Une paire de rotors pour compresseur à vis haute pression comporte un rotor principal et un rotor auxiliaire. Le rotor principal comprend des dents sensiblement convexes disposés à l'extérieur de son cercle primitif de référence et le rotor auxiliaire présente des dents sensiblement concaves disposées à l'intérieur de son cercle primitif. L'entraxe qui délimite la dimension des éventuels coussinets est accru uniquement par l'augmentation du nombre de dents sur le rotor auxiliaire.A high pressure screw compressor rotor pair has a main rotor and an auxiliary rotor. The main rotor comprises substantially convex teeth arranged outside its pitch circle of reference and the auxiliary rotor has substantially concave teeth arranged inside its pitch circle. The center distance which delimits the dimension of any bearings is increased only by increasing the number of teeth on the auxiliary rotor.
Description
Rotorpaar für Hochdruckschraubenverdichter Pair of rotors for high pressure screw compressors
Anwendungsgebiet der Erfindung Field of application of the invention
Die Erfindung betrifft ein Rotorpaar für einen Hochdruckschraubenverdichter, der aus Haupt- und Nebenrotor besteht, wobei der Hauptrotor im wesentlichen konvexe außerhalb seines Teilkreises angeordnete Zähne aufweist und der Nebenrotor im wesentlichen konkave innerhalb seines Teilkreises angeordnete Zähne aufweist, wobei beide Rotoren gegensinnig verschraubt sind und sich die Verschraubungswinkel der gegenüberliegenden Stirn flächen von Hauptrotor zu Nebenrotor wie die Zähnezahlen von Hauptrotor zu Nebenrotor verhalten und die Zahnlücken von Haupt- und Nebenrotor kommunizierende V-förmige Arbeitskammern bilden, in denen der Arbeitszyklus Ansaugen, Verdichten, Ausschieben infolge der Drehung der Rotoren stattfindet und dadurch Druckdifferenzen an den Rotoren vorhanden sind, die zu Aktionskräften an den Lagern führen- Die Rotoren sind koaxial in Stützlagern und Spurlagern gelagert.
Charakteristik des bekannten Standes der Technik The invention relates to a pair of rotors for a high-pressure screw compressor, which consists of a main rotor and a secondary rotor, the main rotor having teeth that are essentially convex outside of its pitch circle and the side rotor having teeth that are essentially concave inside its pitch circle, both rotors being screwed in opposite directions and each other the screwing angles of the opposite end faces from the main rotor to the secondary rotor behave like the number of teeth from the main rotor to the secondary rotor and the tooth gaps from the main and secondary rotor form communicating V-shaped working chambers, in which the working cycle suction, compression, ejection takes place due to the rotation of the rotors and thereby There are pressure differences on the rotors, which lead to action forces on the bearings. The rotors are coaxially mounted in support bearings and thrust bearings. Characteristic of the known prior art
An bekannten Rotorpaaren für Schraubenverdichter ist die Zähnezahl so festgelegt, daß der Nebenrotor steif genug gegen Biegung ist. In known rotor pairs for screw compressors, the number of teeth is fixed in such a way that the secondary rotor is stiff enough against bending.
Verwendet werden Zähnezahlkombinationen mit einer Differenz Nebenrotorzähnezähl minus Hauptrotorzähnezahl von -1 bis +2, wodurch infolge des kleinen Achsabstandes der Rotoren die Tragfähigkeit der Stützlager insbesondere des Nebenrotors relativ begrenzt ist. Combinations of teeth with a difference in the number of secondary rotor teeth minus the number of main rotor teeth from -1 to +2 are used, which means that the load capacity of the support bearings, especially the secondary rotor, is relatively limited due to the small center distance of the rotors.
Dadurch wird der Einsatzbereich bekannter Schraubenverdichter hinsichtlich seines maximal zulässigen Betriebsdruckes auf etwa 2,5 MPa begrenzt, und Hochdruckeinsatzfälle können nicht abgedeckt werden. As a result, the area of use of known screw compressors is limited to approximately 2.5 MPa with regard to its maximum permissible operating pressure, and high-pressure applications cannot be covered.
Die Vergrößerung der Zähnezahl an Haupt- und Nebenrotor an anderen bekannten Verdichtern führt zwar zu einer unbedeutenden Verbesserung der Tragfähigkeit, beeinflußt jedoch den Liefergrad durch Verschlechterung der inneren Dichtheit ungünstig, da mit zunehmender Zähnezahl des Hauptrotors bei einem vorgegebenen Förderstrom des Verdichters die Zahnlücken, die die V-förmigen Arbeitskammern bilden, stärker verkleinert werden als die wirksamen inneren Spalte zwischen Hauptrotor- und Nebenrotorsähnen und zwischen den Rotoren und dem Gehäuse. The increase in the number of teeth on the main and secondary rotors on other known compressors leads to an insignificant improvement in the load-bearing capacity, but adversely affects the degree of delivery by deteriorating the internal tightness, since with increasing number of teeth of the main rotor at a given flow rate of the compressor, the tooth gaps that the Form V-shaped working chambers, are reduced in size more than the effective inner gaps between the main rotor and secondary rotor teeth and between the rotors and the housing.
Ziel der orfindung Objective of the invention
Das Ziel der Erfindung besteht darin, den Einsatzbereich des Schraubenverdichters hinsichtlich höherer Betriebsdrücke bei guten energieökonomischen Kennziffern und niedrigen Hersfellungskosten zu erweitern. The aim of the invention is to expand the field of use of the screw compressor with regard to higher operating pressures with good energy-economic indicators and low manufacturing costs.
Wesen der Erfindung Essence of the invention
Die Aufgabe der Erfindung besteht darin, durch Veränderung der Hauptabmessungen der Rotoren den Achsabstaπd zu vergrößern und die innere Dichtheit des Schraubenverdichters in Bezug auf das Zahniückenvolumen und in Bezυg auf die zeitliche Größe eines Arbeitsspieles zu verbessern.
Die Aufgabe der Erfindung wird dadurch gelöst, daß der Achsabstand, der die Größe der möglichen Lager begrenzt, nur durch Vergrößerung der Nebenrotorzähnezähl vergrößert wird. The object of the invention is to increase the center distance by changing the main dimensions of the rotors and to improve the internal tightness of the screw compressor in relation to the tooth space volume and in relation to the temporal size of a work cycle. The object of the invention is achieved in that the center distance, which limits the size of the possible bearings, is increased only by increasing the number of secondary rotor teeth.
Erfindungsgemäß hat ein Rotorpaar für einen Hochdruckschraubenverdichter einen Nebenrotor, der mindestens 3 Zähne mehr als der Hauptrotor aufweist, wobei die Zähnezahldifferenz vom maximalen Betriebsdruck abhängt und so groß ist, daß durch d ie mit der Vergrößerung der Zähnezahl des Nebenrotors verbundene vergrößerte Aktionskraft auf das druckseitige Stützlager des Nebenrotors kleiner ist als die Tragfähigkeit des größtmöglichen Stützlagers, das infolge der Vergrößerung des Achsabstandes durch die Größe der Nebenrotorzähnezähi bedingt" ist. According to the invention, a pair of rotors for a high-pressure screw compressor has a secondary rotor which has at least 3 teeth more than the main rotor, the difference in the number of teeth depending on the maximum operating pressure and being so great that the increased action force on the pressure-side support bearing associated with the increase in the number of teeth on the secondary rotor of the secondary rotor is smaller than the load-bearing capacity of the largest possible support bearing, which is due to the enlargement of the center distance due to the size of the secondary rotor teeth.
Daraus ergibt sich eine Zähnezahl des Nebenrotors, bei der die Tragfähigkeit der haupt- und nebenrotorseitigen Stützlager und Spurlager größer ist als die auftretenden gaskraftbedingten Aktionskräfte an den Lagerstellen. This results in a number of teeth on the secondary rotor, in which the load-bearing capacity of the main and secondary rotor-side support bearings and thrust bearings is greater than the gas force-related action forces at the bearing points.
Durch die erfindungsgemäße Gestaltung der Zähnezahlen für Hauptrotor zu Nebenrotor von 4 zu 8 reduziert sich der Versehraubungswinkel des Nebenrotors auf 50% des Hauptrotors, während der Achsabstand gegenüber einer Kombination von 4 zu 6. um 23% zunimmt, so daß am Nebenrotorwellenende ein Wälzlager als Stützlager mit einer um 40 bis 50% höheren Tragfähigkeit (Vergleichsbasis: Lageraußendurchmesser für den Nebenrotor gleich Achsabstand) eingesetzt werden kann, während die Aktionskraft an dieser Stelle bei einem maximalen Betriebsdruck von 3,5 MPa nur um 8% ansteigt, wenn die Nebenrotorzähnezähl von 6 auf 8 erhöht wird. Die inneren Spalte werden durch die Vergrößerung der Nebenrotorzähnezähl positiv beeinflußt, da Lagerspiel und Wärmedehnung des Rotors gegenläufig sind. Due to the inventive design of the number of teeth for main rotor to secondary rotor from 4 to 8, the angle of de-icing of the secondary rotor is reduced to 50% of the main rotor, while the center distance increases by 23% compared to a combination of 4 to 6, so that a roller bearing as a support bearing at the secondary rotor shaft end with a 40 to 50% higher load capacity (basis for comparison: bearing outer diameter for the secondary rotor equals the center distance), while the action force at this point only increases by 8% at a maximum operating pressure of 3.5 MPa if the secondary rotor teeth count increases from 6 8 is increased. The inner gaps are positively influenced by the increase in the number of secondary rotor teeth, since the bearing play and thermal expansion of the rotor are in opposite directions.
Ein weiteres Merkmai Mer Erfindung betrifft die Größe des Verschraubungswinkels des Hauptrotors, der in Abhängigkeit von der Umfangsgeschwindigkeit festgelegt wird.
Dabei besteht zwischen Verschraubungswinkel und Umfangs
Another feature of the invention relates to the size of the screwing angle of the main rotor, which is determined as a function of the peripheral speed. There is between the screw angle and the circumference
geschwindigkeit Vu die Beziehung:
= Vu · K mit speed V u the relationship: = V u · K with
K = 14 bi s 13 und Vu in Meter je Sekunde; K = 14 to 13 and V u in meters per second;
Durch Reduzierung des Verschraubungswinkels bei kleinen Umfangsgeschwindigkeiten werden di e inneren Spaltverluste insbesondere an kleinen Schraubenverdichtern gesenkt , da der Verdichtungsvorgang schneller abl äuft al s bei den bi sher übl i chen Verschraubungswinkel n von 300 bis 323° . By reducing the screwing angle at low circumferential speeds, the internal gap losses are reduced, especially on small screw compressors, since the compression process is faster than with the usual screwing angles n of 300 to 323 °.
Ausführungsbeispiel Embodiment
Der Abstand der Rotoren eines Schraubenverdichters, der die Größe der möglichen Lager begrenzt, wird durch die Tergröfßerang der Nebenrotorzähnezähl erreicht. Ber Nebenrotor hat mindestens 3 Zähne mehr als der Hauptrotor, Bei der Gestaltung der zahnezahlen für Hauptrotor zu Hebenrotor von 4 zu 8 reduziert sieh der Terschraubungswinkel des Nebenrotors auf 50 Prozent des Hauptrotors.
The distance between the rotors of a screw compressor, which limits the size of the possible bearings, is achieved by the size of the secondary rotor teeth. The secondary rotor has at least 3 teeth more than the main rotor. When designing the number of teeth for the main rotor to lifting rotor from 4 to 8, the screwing angle of the secondary rotor is reduced to 50 percent of the main rotor.
Claims
1. Rotorpaar für einen Hochdruckschraubenverdichter, das aus einem Hauptrotor mit im wesentlichen konvexen außenhalb seines Teilkreises angeordneten Zähnen und aus einem Nebenrotor mit im wesentlichen konkaven innerhalb seines Teilkreises angeordneten Zähnen, die gegensinnig ver schraubt sind, besteht und sich der Verschraubungswinkel auf die gegenüberliegenden Stirnflächen der Rotoren bezieht, wobei die Rotoren koaxial in Stütz- und Spurlagern im Abstand ihrer Drehachsen, dem Achsabstand, gelagert sind und die durch den Arbeitszyklus Ansaugen, Verdichten, Ausschieben bedingten Aktionskräfte in radialer und axialer Richtung aufnehmen, g e k e n n z e i c h n e t d a d u r c h , 1.Rotor pair for a high-pressure screw compressor, which consists of a main rotor with essentially convex teeth arranged outside its pitch circle and a secondary rotor with essentially concave teeth arranged within its pitch circle, which are screwed in opposite directions, and the screwing angle on the opposite end faces of the Relates to rotors, the rotors being mounted coaxially in support and track bearings at a distance from their axes of rotation, the center distance, and absorbing the action forces caused by the working cycle suction, compression, ejection in radial and axial direction, characterized in that
daß die Zähnezahl des Nebenrot ors so groß ist, daß die Tragfähigeit der haupt- und nebenrotorseitigen Stutzlager grnößer ist als die gaskraftbedingten Aktionskräfte an den Lagerstellen und daß der Nebenrotor mindestens 3 Zähne mehr als der Hauptrotor aufweist, wobei die Zähnezahldifferenz vom maximalen Betriebsdruck des Schraubenverdichters, der beim Ausschieben überwunden werden muß, abhängt und so groß ist, daß durch den mit der Vergrößerung der Nebenrotorzähnezähl vergrößerten Achsabstand zwischen den Rotoren ein solches druckseitiges Stützlager am Nebenrotor vorhanden ist, daß dessen Tragfähigkeit größer ist als die mit vergrößerter Zähnezahl des Nebenrotors verbundene Aktionskräft auf das druckseitige Stützlager des Nebenrotors. that the number of teeth on the secondary rotor is so large that the load-bearing capacity of the main and secondary rotor-side support bearings is greater than the gas force-related action forces at the bearing points and that the secondary rotor has at least 3 teeth more than the main rotor, the number of teeth difference being the maximum operating pressure of the screw compressor, which must be overcome when pushing out, depends and is so large that due to the increased center distance between the rotors as the number of secondary rotor teeth increases, such a pressure-side support bearing is present on the secondary rotor that its load capacity is greater than the action force associated with an increased number of teeth on the secondary rotor the support bearing of the secondary rotor on the pressure side.
Rotorpaar für einen Hochdruckschraubenverdichter, das aus einem Hauptrotor und einem Nebenrotor besteht, dadurch gekennzeichnet, daß der Verschraubungswinkel des Hauptrotors in Grad gemessen 14 bis 18 mal so groß ist, wie der Zahlenwert der Umfangsgeschwindigkeit des Hauptrotors in Meter je Sekunde. Rotor pair for a high-pressure screw compressor, which consists of a main rotor and a secondary rotor, characterized in that the screwing angle of the main rotor, measured in degrees, is 14 to 18 times as large as the numerical value of the peripheral speed of the main rotor in meters per second.
Rotorpaar nach Anspruch 1 für einen maximalen Betriebsdruck von 3,5 MPa, g e k e n n z e i c h n e t d a d u r c h , daß der Hauptrotor vier Zähne und der Nebenrotor acht Zähne aufweist. Rotor pair according to claim 1 for a maximum operating pressure of 3.5 MPa, g e k e n n z e i c h n e t d a d u r c h that the main rotor has four teeth and the secondary rotor has eight teeth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD325008 | 1989-01-17 | ||
| DD325088A DD301062A7 (en) | 1989-01-17 | 1989-01-17 | Rotor pair for high pressure screw compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0404921A1 true EP0404921A1 (en) | 1991-01-02 |
| EP0404921B1 EP0404921B1 (en) | 1993-11-10 |
Family
ID=5606651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90901801A Expired - Lifetime EP0404921B1 (en) | 1989-01-17 | 1990-01-17 | Rotor pair for a high-pressure screw-type compressor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5096399A (en) |
| EP (1) | EP0404921B1 (en) |
| JP (1) | JP2812797B2 (en) |
| DD (1) | DD301062A7 (en) |
| DE (1) | DE59003410D1 (en) |
| WO (1) | WO1990008261A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006021704B4 (en) * | 2006-05-10 | 2018-01-04 | Gea Refrigeration Germany Gmbh | Screw compressor for large power outputs |
| DE102006035782B4 (en) * | 2006-08-01 | 2018-10-25 | Gea Refrigeration Germany Gmbh | Screw compressor for extremely high operating pressures |
| DE102006035783A1 (en) * | 2006-08-01 | 2008-02-07 | Grasso Gmbh Refrigeration Technology | screw compressors |
| GB0921968D0 (en) * | 2009-12-17 | 2010-02-03 | Epicam Ltd | A rotary deviceand method of designingand makinga rotary device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH255202A (en) * | 1944-06-29 | 1948-06-15 | Ljungstroms Angturbin Ab | Rotary machine. |
| DE3111834A1 (en) * | 1981-03-26 | 1982-10-21 | Balcke-Dürr AG, 4030 Ratingen | Screw compressor |
| DE3140108A1 (en) * | 1981-10-09 | 1983-04-28 | Technika Beteiligungsgesellschaft mbH, 4800 Bielefeld | TURN PISTON COMPRESSORS |
| JPS60116920A (en) * | 1983-11-30 | 1985-06-24 | Hitachi Ltd | Thrust bearing holding in rotary fluid machine |
| GB8413619D0 (en) * | 1984-05-29 | 1984-07-04 | Compair Ind Ltd | Screw rotor machines |
| SE453318B (en) * | 1987-02-18 | 1988-01-25 | Svenska Rotor Maskiner Ab | ROTOR MACHINE WITH AN AXIAL POWER BALANCING DEVICE |
-
1989
- 1989-01-17 DD DD325088A patent/DD301062A7/en unknown
-
1990
- 1990-01-17 JP JP2502330A patent/JP2812797B2/en not_active Expired - Fee Related
- 1990-01-17 DE DE90901801T patent/DE59003410D1/en not_active Expired - Lifetime
- 1990-01-17 EP EP90901801A patent/EP0404921B1/en not_active Expired - Lifetime
- 1990-01-17 WO PCT/EP1990/000093 patent/WO1990008261A1/en active IP Right Grant
- 1990-07-18 US US07/553,802 patent/US5096399A/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9008261A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DD301062A7 (en) | 1992-10-01 |
| JPH03503307A (en) | 1991-07-25 |
| US5096399A (en) | 1992-03-17 |
| WO1990008261A1 (en) | 1990-07-26 |
| DE59003410D1 (en) | 1993-12-16 |
| JP2812797B2 (en) | 1998-10-22 |
| EP0404921B1 (en) | 1993-11-10 |
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