EP0451085A2 - Screw rotor pump - Google Patents

Screw rotor pump Download PDF

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Publication number
EP0451085A2
EP0451085A2 EP91710004A EP91710004A EP0451085A2 EP 0451085 A2 EP0451085 A2 EP 0451085A2 EP 91710004 A EP91710004 A EP 91710004A EP 91710004 A EP91710004 A EP 91710004A EP 0451085 A2 EP0451085 A2 EP 0451085A2
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EP
European Patent Office
Prior art keywords
spindle
pressure
screw pump
suction
angle
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Application number
EP91710004A
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German (de)
French (fr)
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EP0451085B1 (en
EP0451085A3 (en
Inventor
Rolf Dipl.-Ing. Quast
Klaus Dipl.-Ing. Willibald
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Allweiler GmbH
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Allweiler AG
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Priority to EP96105318A priority Critical patent/EP0727581B1/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
    • F04C18/12—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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels

Definitions

  • the invention relates to a screw pump with a drive spindle and at least one running spindle, which are mounted in a recess of a housing surrounding them between a suction chamber and a pressure chamber.
  • Such a screw pump is described by way of example in DE-OS 38 15 158.
  • the typical pressure pulsation is superimposed with a forced inverse pressure pulsation, which can be achieved by periodically controlling a part of the flow on the pressure side of the conveyor screws.
  • This method is made possible by a pressure-side diaphragm, which is designed with a drain to the suction side, which is periodically covered by a closure element depending on the rotational position of the drive spindle.
  • wedge bevels tapering towards the suction space are incorporated into the receiving bores at the pressure-side end of the housing.
  • EP-OS 209 984 shows a screw pump mentioned at the beginning, whose drive spindle engages with the protruding thread in the thread formations of some running spindles and is said to form several tight chambers.
  • at least one circumferential channel is provided around the periphery of the spindles, so that the last of the sealed chambers at an outlet communicates with it - shortly before it is released by the chamber - partially via the channel.
  • the pressure-side profile outlet of the spindle is tapered on the outside diameter and the angle of inclination of the cone surface is less than 10 °.
  • the angle of inclination of the cone surface is less than 10 °.
  • This pressure-side bevel causes a gradual and defined opening of the pressure-side chamber to take place at the appropriate time; This largely compensates for the increase in volume flow or pressure caused by closing the suction side. The initial pulsation is significantly reduced.
  • the suction-side profile end can also be provided with such a flat conical surface, although the axial length of the latter conical surface should be less than the axial length of the pressure-side conical surface.
  • the tooth thickness of the drive spindle should be reduced towards the profile runout or the tooth gap of the spindle corresponding to this tooth thickness should be widened in the same direction.
  • a screw pump 10 has in a housing 12 a drive spindle 14 of the outer diameter d and two laterally arranged running spindles 16.
  • the spindles 14, 16 are mounted in overlapping receiving bores 18 of the housing 12.
  • the housing 12 is closed both on the pressure side and on the suction side to form a pressure chamber 20 and a suction chamber 22, each with a pump cover 25 or 24.
  • the drive spindle 14 guided through the pressure-side pump cover 25 is provided with an axial thrust compensation piston 28 in the area of a through bore 26 and is additionally supported with a bearing 30 in a cover attachment 32. In the latter there is also a shaft seal 34.
  • the interior 36 of the lid attachment 32 is relieved of the delivery pressure; the liquid entering from the pressure chamber 20 is discharged via a relief channel 38 which opens into the suction chamber 22 via a connecting bore 40 in the housing 12.
  • Fig. 2 makes it clear that the drive spindle 14 - the profile length - is tapered at its ends, the length of the pressure-side cone 42 with e, the length of the suction-side cone 42 s protruding with that end face 44 by e1, between the conical surfaces 43, 43 s remaining cylinder length of the drive spindle 14 with q, the pitch angle of the thread 15 of the drive spindle 14 - or the spindle 16 - indicated only partially in Fig. 2 - with t and the slope with s .
  • the pressure-side cone angle w or the suction-side cone angle w 1 is preferably 2 °.
  • the length adjustment of the entire system is chosen so that a portion of the sealing lines shown in FIG. 3 is generated during part of the production period; this means an increase from Qvmax to Qvmin.
  • the pulsation pattern is thus changed by attaching the described conical surface 43 to the pressure-side spindle end, which leads to a decrease in Qv and Q kom .
  • the elongation of the cross-sectionally inclined conical surface 43 has the effect that, on the one hand, the pressure side opens earlier, and on the other hand the cross-sections become continuously larger during opening. It may be sufficient to provide the pressure side with the cone 42 and to leave the spindle end on the suction side cylindrical.
  • the operating system for the three-spindle screw pump 10 shown can be described as follows: On the basis of a certain number of chambers n, which is a measure of the internal pressure build-up in the pump, the ratio of length to slope - ie a / s - represents an analogue quantity for the geometric implementation; the greater this ratio, the smaller the pressure increase per unit length.
  • x is a prefactor with 0.15 ⁇ x ⁇ 0.4
  • n describes the number of chambers acting on average.
  • the pre-factor x is a measure of the pre-compression, which, depending on the profile, only occurs for values above 0.1 - 0.15.
  • the pressure-side cone 42 must be matched to that dimension x - that is, to the pre-compression achieved.
  • the length e is chosen such that for the normal case
  • the cone 42 s on the suction side generally allows the adjustment of the closing characteristics, as shown at A 'in Fig. 2.
  • This cone 42 s must be precisely matched to the pressure-side cone 42 on the basis of a defined length ratio a / s.
  • e1 of the cone 42 s to choose less than the length e of the other cone 42.
  • the length e to make the pressure-side cone 42 smaller overall length.
  • the tooth thickness b of the thread 15 of the drive spindle 14 is reduced at the profile runout.
  • the tooth gap of the spindle 16 can also be widened.
  • the constructive relief of the tooth thickness b or the tooth gaps towards the profile runout is to be carried out so that the pre-opening can take place early enough; the length of the change x 1 according to FIG. 4 in the profile must be clear in relation to the spindle pitch s.
  • the reduction in tooth thickness or the widening of the tooth gap must have a small gradient y: x 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Supercharger (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Bei einer Schraubenspindelpumpe mit einer Antriebsspindel und wenigstens einer Laufspindel, die in einer Ausnehmung eines sie umgebenden Gehäuses zwischen einem Saugraum und einem Druckraum gelagert sind, ist der druckseitige Profilauslauf der Spindel (14) am Außendurchmesser (d) konisch angedreht, und der Neigungswinkel (w) der Konusfläche (43) liegt unter 10°, gegebenenfalls unter 5° bzw. 3°. Zudem kann die Spindel (14) an ihrem saugseitigen Ende eine Konusfläche (43s) mit einem entsprechenden Neigungswinkel (w₁) aufweisen.

Figure imga0001
In the case of a screw pump with a drive spindle and at least one running spindle, which are mounted in a recess of a housing surrounding them between a suction chamber and a pressure chamber, the pressure-side profile outlet of the spindle (14) on the outside diameter (d) is tapered, and the angle of inclination (w ) of the conical surface (43) is below 10 °, optionally below 5 ° or 3 °. In addition, the spindle (14) can have a conical surface (43 s ) with a corresponding inclination angle (w 1) at its suction end.
Figure imga0001

Description

Die Erfindung betrifft eine Schraubenspindelpumpe mit einer Antriebsspindel und wenigstens einer Laufspindel, die in einer Ausnehmung eines sie umgebenden Gehäuses zwischen einem Saugraum und einem Druckraum gelagert sind.The invention relates to a screw pump with a drive spindle and at least one running spindle, which are mounted in a recess of a housing surrounding them between a suction chamber and a pressure chamber.

Eine solche Schraubenspindelpumpe wird beispielhaft in der DE-OS 38 15 158 beschrieben. Bei einem dort offenbarten Verfahren zur Verringerung der Druckpulsation wird die arttypische Druckpulsation mit einer erzwungenen inversen Druckpulsation überlagert, welche durch periodisches Absteuern eines Teiles des Förderstromes auf der Druckseite der Förderschrauben erzielbar ist. Dieses Verfahren wird durch eine druckseitige Blende ermöglicht, die mit einem Abfluß zur Saugseite hin ausgebildet ist, welche periodisch abhängig von der Drehstellung der Antriebsspindel mittels eines Verschlußorganes abgedeckt wird. In dieser Druckschrift wird auch erörtert, daß in die Aufnahmebohrungen am druckseitigen Ende des Gehäuses sich zum Saugraum hin verjüngende Keilschrägen eingearbeitet sind.Such a screw pump is described by way of example in DE-OS 38 15 158. In a method for reducing the pressure pulsation disclosed there, the typical pressure pulsation is superimposed with a forced inverse pressure pulsation, which can be achieved by periodically controlling a part of the flow on the pressure side of the conveyor screws. This method is made possible by a pressure-side diaphragm, which is designed with a drain to the suction side, which is periodically covered by a closure element depending on the rotational position of the drive spindle. In this document it is also discussed that wedge bevels tapering towards the suction space are incorporated into the receiving bores at the pressure-side end of the housing.

Der EP-OS 209 984 kann eine eingangs erwähnte Schraubenspindelpumpe entnommen werden, deren Antriebsspindel mit ihrem auskragendem Gewinde in Gewindeeinformungen einiger Laufspindeln eingreift und dabei mehrere dichte Kammern bilden soll. Außerdem ist zumindest ein in Umfangsrichtung verlaufender Kanal um die Peripherie der Laufspindeln vorgesehen, so daß die letzte der dichten Kammern an einem Auslaß mit diesem -- kurz vor dessen Freigabe durch die Kammer -- teilweise über den Kanal kommuniziert.EP-OS 209 984 shows a screw pump mentioned at the beginning, whose drive spindle engages with the protruding thread in the thread formations of some running spindles and is said to form several tight chambers. In addition, at least one circumferential channel is provided around the periphery of the spindles, so that the last of the sealed chambers at an outlet communicates with it - shortly before it is released by the chamber - partially via the channel.

In Kenntnis dieses Standes der Technik hat sich der Erfinder das Ziel gesetzt, eine Schraubenspindelpumpe der gattungsgemäßen Art dahingehend zu verbessern, daß die Druckpulsation ohne zusätzliche Maschinenteile weitergehend wirksam gedämpft wird.Knowing this state of the art, the inventor has set itself the goal of improving a screw pump of the generic type in such a way that the pressure pulsation is effectively further damped without additional machine parts.

Zur Lösung dieser Aufgabe führt eine Schraubenspindelpumpe nach der Lehre des Patentanspruchs 1; der druckseitige Profilauslauf der Spindel ist am Außendurchmesser konisch angedreht und der Neigungswinkel der Konusfläche liegt unter 10°. Von besonderer Bedeutung für die Verminderung der Pulsation ist eine äußerst flache Konusfläche mit einem Neigungswinkel unter 5°, bevorzugt sogar unter 3°.To solve this problem leads a screw pump according to the teaching of claim 1; the pressure-side profile outlet of the spindle is tapered on the outside diameter and the angle of inclination of the cone surface is less than 10 °. Of particular importance for reducing the pulsation is an extremely flat conical surface with an inclination angle of less than 5 °, preferably even less than 3 °.

Diese druckseitige Anschrägung bewirkt, daß zum geeigneten Zeitpunkt ein allmähliches und definiertes Öffnen der druckseitigen Kammer erfolgt; damit kann der durch das Schließen der Saugseite entstehende Volumenstrom- bzw. Druckanstieg größtenteils ausgeglichen werden. Die Ausgangspulsation wird deutlich verringert.This pressure-side bevel causes a gradual and defined opening of the pressure-side chamber to take place at the appropriate time; This largely compensates for the increase in volume flow or pressure caused by closing the suction side. The initial pulsation is significantly reduced.

Nach einem weiteren Merkmal der Erfindung kann auch das saugseitige Profilende mit einer derartigen flachen Konusfläche versehen sein, wobei allerdings die axiale Länge der letztgenannten Konusfläche geringer sein soll als die axiale Länge der druckseitigen Konusfläche.According to a further feature of the invention, the suction-side profile end can also be provided with such a flat conical surface, although the axial length of the latter conical surface should be less than the axial length of the pressure-side conical surface.

Somit wird erreicht, daß durch ein gezieltes Abstimmen von Systemwirklänge und druckseitigem -- gegebenenfalls zusätzlich saugseitigem -- Konus die Pulsation verringert wird.It is thus achieved that the pulsation is reduced by a targeted adjustment of system effective lengths and pressure-side - possibly additional suction-side - cone.

Im Rahmen der Erfindung liegt eine weitere Lösung der vom Erfinder vorgegebenen Aufgabe; die Zahndicke der Antriebsspindel soll zum Profilauslauf hin verringert bzw. die mit dieser Zahndicke korrespondierende Zahnlücke der Laufspindel in gleicher Richtung verbreitert sein.Within the scope of the invention there is a further solution to the problem specified by the inventor; the tooth thickness of the drive spindle should be reduced towards the profile runout or the tooth gap of the spindle corresponding to this tooth thickness should be widened in the same direction.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt in:

  • Fig. 1: einen Längsschnitt durch eine Schraubenspindelpumpe;
  • Fig. 2: einen vergrößerten Teilschnitt durch die Schraubenspindelpumpe;
  • Fig. 3: ein Diagramm zur Druckpulsation bzw. Volumenstrompulsation der Schraubenspindelpumpe;
  • Fig. 4: eine Schnittskizze zur Zahndickendimensionierung.
Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; this shows in:
  • 1: a longitudinal section through a screw pump;
  • 2: an enlarged partial section through the screw pump;
  • 3: a diagram of the pressure pulsation or volume flow pulsation of the screw pump;
  • 4: a sectional sketch for dimensioning the tooth thickness.

Eine Schraubenspindelpumpe 10 weist in einem Gehäuse 12 eine Antriebsspindel 14 des Außendurchmessers d sowie zwei seitlich angeordnete Laufspindeln 16 auf. Die Spindeln 14, 16 sind in sich überschneidenden Aufnahmebohrungen 18 des Gehäuses 12 gelagert.A screw pump 10 has in a housing 12 a drive spindle 14 of the outer diameter d and two laterally arranged running spindles 16. The spindles 14, 16 are mounted in overlapping receiving bores 18 of the housing 12.

Das Gehäuse 12 ist sowohl druckseitig als auch saugseitig unter Bildung eines Druckraums 20 und eines Saugraums 22 jeweils mit einem Pumpendeckel 25 bzw. 24 verschlossen. Die durch den druckseitigen Pumpendeckel 25 geführte Antriebsspindel 14 ist im Bereich einer Durchführungsbohrung 26 mit einem Axialschubausgleichkolben 28 versehen sowie mit einem Lager 30 in einem Deckelaufsatz 32 zusätzlich abgestützt. In letzterem findet sich auch eine Wellenabdichtung 34.The housing 12 is closed both on the pressure side and on the suction side to form a pressure chamber 20 and a suction chamber 22, each with a pump cover 25 or 24. The drive spindle 14 guided through the pressure-side pump cover 25 is provided with an axial thrust compensation piston 28 in the area of a through bore 26 and is additionally supported with a bearing 30 in a cover attachment 32. In the latter there is also a shaft seal 34.

Der Innenraum 36 des Deckelaufsatzes 32 ist vom Förderdruck entlastet; die vom Druckraum 20 eintretende Flüssigkeit wird über einen Entlastungskanal 38 abgeführt, der über eine Verbindungsbohrung 40 des Gehäuses 12 in den Saugraum 22 einmündet.The interior 36 of the lid attachment 32 is relieved of the delivery pressure; the liquid entering from the pressure chamber 20 is discharged via a relief channel 38 which opens into the suction chamber 22 via a connecting bore 40 in the housing 12.

Fig. 2 macht deutlich, daß die Antriebsspindel 14 -- der Profillänge -- an ihren Enden konisch abgedreht ist, wobei die Länge des druckseitigen Konus 42 mit e, die Länge des mit jener Stirnfläche 44 um ein Maß i überstehenden saugseitigen Konus 42s mit e₁, die zwischen den Konusflächen 43, 43s verbleibende Zylinderlänge der Antriebsspindel 14 mit q, der Steigungswinkel des in Fig. 2 nur teilweise angedeuteten Gewindeganges 15 der Antriebsspindel 14 -- oder der Laufspindel 16 -- mit t sowie die Steigung mit s bezeichnet sind. Der druckseitige Konuswinkel w bzw. der saugseitige Konuswinkel w₁ liegt bevorzugt bei 2°.Fig. 2 makes it clear that the drive spindle 14 - the profile length - is tapered at its ends, the length of the pressure-side cone 42 with e, the length of the suction-side cone 42 s protruding with that end face 44 by e₁, between the conical surfaces 43, 43 s remaining cylinder length of the drive spindle 14 with q, the pitch angle of the thread 15 of the drive spindle 14 - or the spindle 16 - indicated only partially in Fig. 2 - with t and the slope with s . The pressure-side cone angle w or the suction-side cone angle w 1 is preferably 2 °.

In Fig. 3 ist graphisch die Längsoptimierung durch eine erfindungsgemäße Vorkompression dargestellt, wobei die dort verwendeten Buchstaben die folgenden Bedeutungen haben:

A:
Ausgangspulsation;
B:
Pulsation bei Nutzung des
Vorkompressionseffektes;
Qv:
Verlustvolumenstrom;
Qkom:
Kompressionsvolumenstrom.
3 shows the longitudinal optimization by means of a pre-compression according to the invention, the letters used there having the following meanings:
A:
Initial pulsation;
B:
Pulsation when using the
Pre-compression effect;
Qv:
Loss volume flow;
Q com :
Compression volume flow.

Die Längenabstimmung des gesamten Systems wird so gewählt, daß während eines Teils der Förderperiode ein in Fig. 3 wiedergegebenes Mehr an Dichtlinien erzeugt wird; dies bedeutet, einen Anstieg von Qvmax auf Qvmin. Durch gezieltes Verändern der Dichtgüte über den beschriebenen Konus 42 wird insbesondere auf der Druckseite das "harte" Öffnen aufgrund der Spindelgeometrie vermieden.The length adjustment of the entire system is chosen so that a portion of the sealing lines shown in FIG. 3 is generated during part of the production period; this means an increase from Qvmax to Qvmin. By deliberately changing the sealing quality via the described cone 42, the "hard" opening due to the spindle geometry is avoided, in particular on the pressure side.

Ausgehend von der Ausgangspulsation wird somit durch das Anbringen der beschriebenen Konusfläche 43 am druckseitigen Spindelende das Pulsationsbild geändert, was zu einem Kleinerwerden von Qv und Qkom führt. Die Verlängerung der querschnittlich schrägen Konusfläche 43 bewirkt, daß einerseits die Druckseite früher öffnet, anderseits die Querschnitte während des Öffnens kontinuierlich größer werden. So kann es ausreichen, die Druckseite mit dem Konus 42 zu versehen und das saugseitige Spindelende zylindrisch zu belassen.Starting from the initial pulsation, the pulsation pattern is thus changed by attaching the described conical surface 43 to the pressure-side spindle end, which leads to a decrease in Qv and Q kom . The elongation of the cross-sectionally inclined conical surface 43 has the effect that, on the one hand, the pressure side opens earlier, and on the other hand the cross-sections become continuously larger during opening. It may be sufficient to provide the pressure side with the cone 42 and to leave the spindle end on the suction side cylindrical.

Für die dargestellte dreispindelige Schraubenspindelpumpe 10 kann das Wirksystem folgendermaßen beschrieben werden:
   Unter Zugrundelegung einer bestimmten Kammerzahl n, welche ein Maß für den pumpeninternen Druckaufbau ist, stellt das Verhältnis von Länge zu Steigung --, d.h. also a/s -- eine analoge Größe für die geometrische Realisierung dar; je größer dieses Verhältnis ist, umso kleiner wird der Druckanstieg je Längeneinheit.The operating system for the three-spindle screw pump 10 shown can be described as follows:
On the basis of a certain number of chambers n, which is a measure of the internal pressure build-up in the pump, the ratio of length to slope - ie a / s - represents an analogue quantity for the geometric implementation; the greater this ratio, the smaller the pressure increase per unit length.

Für die Anwendung des Vorkompressionsverfahrens sind bei der Längenabstimmung folgende Voraussetzungen zu erfüllen:When using the pre-compression procedure, the following requirements must be met when adjusting the length:

a = 1 + (2 . n - 1) . x mit nE N, d.h. 1,2, ....
wobei a = 1 + (2. n - 1). x with nE N, ie 1.2, ....
in which

x ein Vorfaktor mit 0,15 < x < 0,4 ist, undx is a prefactor with 0.15 <x <0.4, and

n die Anzahl der im Mittel wirkenden Kammern beschreibt.n describes the number of chambers acting on average.

Der Vorfaktor x ist ein Maß für die Vorkompression, die im übrigen profilabhängig erst für Werte oberhalb von 0,1 - 0,15 auftritt.The pre-factor x is a measure of the pre-compression, which, depending on the profile, only occurs for values above 0.1 - 0.15.

Zu beachten ist, daß sich die nachstehenden Angaben auf das besonders vorteilhafte erfindungsgemäße Anschrägen der Antriebsspindel 14 beziehen.It should be noted that the information below relates to the particularly advantageous chamfering of the drive spindle 14 according to the invention.

Bei konstantem Winkel w (0 < w < 3°) muß der druckseitige Konus 42 auf jenes Maß x -- also auf die erzielte Vorkompression -- abgestimmt werden. So wird beispielsweise für einen Winkel w von etwa 2° die Länge e derart gewählt, daß für den NormalfallAt a constant angle w (0 <w <3 °), the pressure-side cone 42 must be matched to that dimension x - that is, to the pre-compression achieved. For example, for an angle w of approximately 2 °, the length e is chosen such that for the normal case

e < x . s gilt; hier tritt etwa bei x = 0,25; n = 3; s = 80 mm, d.h. einem a = 2,25 und einem druckseitigen Konus 42 einer Länge e von 20 mm eine nur sehr kleine Restpulsation auf.e < x. s applies; here occurs approximately at x = 0.25; n = 3; s = 80 mm, ie an a = 2.25 and a pressure-side cone 42 with a length e of 20 mm, only a very small residual pulsation.

Der Konus 42s auf der Saugseite erlaubt ganz allgemein die Anpassung der Schließcharakteristik, wie es bei A′ in Fig. 2 dargestellt ist. Dieser Konus 42s muß unter Zugrundelegung eines definierten Längenverhältnisses a/s auf den druckseitigen Konus 42 genau abgestimmt sein. So ist zweckmäßigerweise die Länge e₁ des Konus 42s kleiner zu wählen als die Länge e des anderen Konus 42. Ferner ist bei unverändertem Maß des Spindelpakets 14, 16 die Länge e des druckseitigen Konus 42 insgesamt kleiner zu gestalten.The cone 42 s on the suction side generally allows the adjustment of the closing characteristics, as shown at A 'in Fig. 2. This cone 42 s must be precisely matched to the pressure-side cone 42 on the basis of a defined length ratio a / s. Thus, advantageously e₁ of the cone 42 s to choose less than the length e of the other cone 42. Further, in the natural dimension of the spindle package 14, 16, the length e to make the pressure-side cone 42 smaller overall length.

Eine sorgfältige Abstimmung der Gesamtgeometrie führt zu einer wirksamen Pulsationsverringerung in einem weiten Druckbereich von 10 bis 80 bar sowie im und Viskositätsbereich von 20 bis 200 mm²/s.Careful coordination of the overall geometry leads to effective pulsation reduction in a wide pressure range from 10 to 80 bar and in the and viscosity range from 20 to 200 mm² / s.

In jedem Falle wird ohne zusätzliche Maschinenteile eine deutlich verringerte Pulsation erreicht.In any case, a significantly reduced pulsation is achieved without additional machine parts.

Bei einem nicht dargestellten Ausführungsbeispiel wird die Zahndicke b des Gewindeganges 15 der Antriebsspindel 14 an deren Profilauslauf vermindert. Auch kann die Zahnlücke der Laufspindel 16 verbreitert werden.In an embodiment not shown, the tooth thickness b of the thread 15 of the drive spindle 14 is reduced at the profile runout. The tooth gap of the spindle 16 can also be widened.

Die konstruktive linderung der Zahndicke b bzw. der Zahnlücken zum Profilauslauf hin ist so vorzunehmen, daß die Voröffnung früh genug stattfinden kann; die Länge der Änderung x₁ gemäß Fig. 4 im Profil muß im Verhältnis zur Spindelsteigung s deutlich sein. Zum anderen muß die Verminderung der Zahndicke bzw. die Verbreiterung der Zahnlücke einen geringen Gradienten y: x₁ aufweisen.The constructive relief of the tooth thickness b or the tooth gaps towards the profile runout is to be carried out so that the pre-opening can take place early enough; the length of the change x 1 according to FIG. 4 in the profile must be clear in relation to the spindle pitch s. On the other hand, the reduction in tooth thickness or the widening of the tooth gap must have a small gradient y: x 1.

Claims (7)

Schraubenspindelpumpe mit einer Antriebsspindel und wenigstens einer Laufspindel, die in einer Ausnehmung eines sie umgebenden Gehäuses zwischen einem Saugraum und einem Druckraum gelagert sind,

dadurch gekennzeichnet,

daß der druckseitige Profilauslauf der Spindel (14, 16) am Außendurchmesser (d) konisch angedreht ist und der Neigungswinkel (w) der Konusfläche (43) unter 10° liegt.Screw pump with a drive spindle and at least one running spindle, which are mounted in a recess of a housing surrounding them between a suction chamber and a pressure chamber,

characterized,

that the pressure-side profile outlet of the spindle (14, 16) on the outer diameter (d) is tapered and the angle of inclination (w) of the conical surface (43) is below 10 °. Schraubenspindelpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Spindel (14, 16) an ihrem saugseitigen Ende eine Konusfläche (43s) mit einem Neigunswinkel (w₁) aufweist.Screw pump according to claim 1, characterized in that the spindle (14, 16) has at its suction end a conical surface (43 s ) with an inclination angle (w₁). Schraubenspindelpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Neigungswinkel (w, w₁) unter 5° liegt.Screw pump according to claim 1 or 2, characterized in that the angle of inclination (w, w₁) is below 5 °. Schraubenspindelpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Neigungswinkel (w,w₁) unter 3° liegt.Screw pump according to claim 1 or 2, characterized in that the angle of inclination (w, w₁) is below 3 °. Schraubenspindelpumpe nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die axiale Länge (e) der druckseitigen Konusfläche (43) größer ist als die axiale Länge (e₁) der saugseitigen Konusfläche (43s).Screw pump according to claim 1 and 2, characterized in that the axial length (e) of the pressure-side cone surface (43) is greater than the axial length (e₁) of the suction-side cone surface (43 s ). Schraubenspindelpumpe mit einer Antriebsspindel und wenigstens einer Laufspindel, die in einer Ausnehmung eines sie umgebenden Gehäuses zwischen einem Saugraum und einem Druckraum gelagert sind, dadurch gekennzeichnet, daß die Zahndicke (b) der Antriebsspindel (14) zu ihrem Profilauslauf hin vermindert ist.Screw pump with a drive spindle and at least one running spindle, which are mounted in a recess of a housing surrounding them between a suction chamber and a pressure chamber, characterized in that the tooth thickness (b) of the drive spindle (14) is reduced towards its profile outlet. Schraubenspindelpumpe nach Anspruch 6, dadurch gekennzeichnet, daß die mit der Zahndicke (b) der Antriebsspindel (14) korrespondierende Zahnlücke der Laufspindel (16) zu ihrem Profilauslauf hin verbreitert ist.Screw pump according to claim 6, characterized in that the tooth gap of the drive spindle (16) corresponding to the tooth thickness (b) of the drive spindle (14) is widened towards its profile runout.
EP91710004A 1990-03-08 1991-03-07 Screw rotor pump Expired - Lifetime EP0451085B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96105318A EP0727581B1 (en) 1990-03-08 1991-03-07 Screw rotor pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007273 1990-03-08
DE4007273 1990-03-08

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP96105318A Division EP0727581B1 (en) 1990-03-08 1991-03-07 Screw rotor pump

Publications (3)

Publication Number Publication Date
EP0451085A2 true EP0451085A2 (en) 1991-10-09
EP0451085A3 EP0451085A3 (en) 1992-07-08
EP0451085B1 EP0451085B1 (en) 1998-08-12

Family

ID=6401666

Family Applications (2)

Application Number Title Priority Date Filing Date
EP91710004A Expired - Lifetime EP0451085B1 (en) 1990-03-08 1991-03-07 Screw rotor pump
EP96105318A Expired - Lifetime EP0727581B1 (en) 1990-03-08 1991-03-07 Screw rotor pump

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP96105318A Expired - Lifetime EP0727581B1 (en) 1990-03-08 1991-03-07 Screw rotor pump

Country Status (6)

Country Link
US (1) US5123821A (en)
EP (2) EP0451085B1 (en)
JP (1) JP3036874B2 (en)
KR (1) KR0177815B1 (en)
AT (2) ATE169721T1 (en)
BR (1) BR9100993A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI104440B (en) * 1995-06-22 2000-01-31 Kone Corp Screw pump and screw pump screw
US6623262B1 (en) 2001-02-09 2003-09-23 Imd Industries, Inc. Method of reducing system pressure pulsation for positive displacement pumps
RU2215189C2 (en) * 2001-08-15 2003-10-27 Открытое Акционерное Общество "Сумское Машиностроительное Научно-Производственное Объединение Им. М.В. Фрунзе" Pump for handling viscous liquids
GB0226529D0 (en) * 2002-11-14 2002-12-18 Dana Automotive Ltd Pump
US8096288B2 (en) * 2008-10-07 2012-01-17 Eaton Corporation High efficiency supercharger outlet
DE102017210767B4 (en) * 2017-06-27 2019-10-17 Continental Automotive Gmbh Screw pump, fuel delivery unit and fuel delivery unit
DE102023110207A1 (en) * 2023-04-21 2024-10-24 R-718 Spindel GbR (vertretungsberechtigter Gesellschafter: Dietmar Rook, 25421 Pinneberg) bracing of the spindle rotor thread tooth ends

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US2652192A (en) * 1947-06-13 1953-09-15 Curtiss Wright Corp Compound-lead screw compressor or fluid motor
US2952216A (en) * 1956-03-13 1960-09-13 Wildhaber Ernest Rotary screw unit for displacing fluid
US2922377A (en) * 1957-09-26 1960-01-26 Joseph E Whitfield Multiple arc generated rotors having diagonally directed fluid discharge flow
CH390690A (en) * 1959-02-23 1965-04-15 Imo Industri Ab Screw pump
FR1243471A (en) * 1959-08-31 1960-10-14 Improvements to rotors for pumps, motors, compressors, fans, meters and other similar devices
US3103894A (en) * 1960-02-18 1963-09-17 Laval Turbine Screw pump
DE2033201C3 (en) * 1970-07-04 1979-02-01 Allweiler Ag Screw motor or pump
SE383774B (en) * 1975-04-02 1976-03-29 Imo Industri Ab SCREW PUMP
JPS5238615A (en) * 1975-09-22 1977-03-25 Mayekawa Mfg Co Ltd Screw compressor
JPS5936116B2 (en) * 1976-08-07 1984-09-01 株式会社荏原製作所 fluid machinery
FR2538463B1 (en) * 1982-12-23 1985-06-21 Dba VOLUMETRIC CONICAL SCREW MACHINE
JPS61294178A (en) * 1985-06-24 1986-12-24 Kawasaki Heavy Ind Ltd Screw pump
DE3815158A1 (en) * 1988-05-04 1989-11-16 Allweiler Ag Method for reducing the pressure pulsation of a positive-displacement pump, in particular a screw pump, and a screw pump designed according to this method

Also Published As

Publication number Publication date
EP0727581A1 (en) 1996-08-21
US5123821A (en) 1992-06-23
EP0727581B1 (en) 1999-02-10
JP3036874B2 (en) 2000-04-24
ATE169721T1 (en) 1998-08-15
ATE176717T1 (en) 1999-02-15
KR910017081A (en) 1991-11-05
EP0451085B1 (en) 1998-08-12
EP0451085A3 (en) 1992-07-08
JPH05231341A (en) 1993-09-07
KR0177815B1 (en) 1999-04-15
BR9100993A (en) 1991-11-05

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