EP0627041A1 - Machine du type a rotor a vis - Google Patents

Machine du type a rotor a vis

Info

Publication number
EP0627041A1
EP0627041A1 EP93904233A EP93904233A EP0627041A1 EP 0627041 A1 EP0627041 A1 EP 0627041A1 EP 93904233 A EP93904233 A EP 93904233A EP 93904233 A EP93904233 A EP 93904233A EP 0627041 A1 EP0627041 A1 EP 0627041A1
Authority
EP
European Patent Office
Prior art keywords
female
lobe
machine
rotors
rotor
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
EP93904233A
Other languages
German (de)
English (en)
Other versions
EP0627041B1 (fr
Inventor
Alan Bryson Riach
John Mcgruer
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.)
Sprintex Australasia Pty Ltd
Original Assignee
Ftd Infinite Ltd
Sprintex Australasia Pty Ltd
FTD INFINITE Ltd
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 Ftd Infinite Ltd, Sprintex Australasia Pty Ltd, FTD INFINITE Ltd filed Critical Ftd Infinite Ltd
Publication of EP0627041A1 publication Critical patent/EP0627041A1/fr
Application granted granted Critical
Publication of EP0627041B1 publication Critical patent/EP0627041B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/082—Details specially related to intermeshing engagement type machines or engines
    • F01C1/084—Toothed wheels

Definitions

  • This invention relates to rotary positive displacement machines of the screw or helical rotors type, normally used as a fluid compressor such as an air compressor and to the rotors for use in such machines.
  • the invention relates to the dry type screw compressor where no lubricating oil passes through the working zones of the machine and the rotors are timed by the use of timing gears positioned outside the working chambers of the rotors which allow the rotors to rotate without coming into contact with each other.
  • the aforementioned dry type rotary machine includes a housing having at least one pair of intersecting bores therein. Inlet and outlet ports are provided at opposite ends of the casing bores. A rotor is mounted for rotation within each of the bores.
  • One of these rotors is of the male type which includes a plurality of helical lobes and intervening grooves which lie substantially outside the pitch circle thereof with the flanks of the lobes having a generally convex profile.
  • the other rotor is of the female type and formed so that it includes a plurality of helical lobes and intervening grooves which lie substantially inside the pitch circle thereof with the flanks of the grooves having a generally concave profile.
  • the lobes on the male rotor cooperate with the ⁇ rooves on the female rotor and the walls of the casin ⁇ to define chambers for the fluid. These chambers may be considered to be chevron shaped.
  • Fluid enters the casing bores through the inlet port filling the cavities which are generated as the rotors come out of mesh on the low pressure side of the rotors- Fluid normally continues to fill the generated chambers until the chambers reach maximum volume.
  • the filling chamber is then cut off from communication with the inlet face of the rotors and the gas is compressed within the chamber.
  • the chamber boundaries consist of the leading and trailing flanks of the male and female lobes and the bores in which the rotors rotate.
  • the purpose for modifying the profile design is to reduce the leakage through the blow hole on both the discharge and induction sides of the compressor, and to reduce the leakage between the rotor tips and the bore which leakage path is especially important in the case of the slower rotating, usually female, rotor.
  • a major leakage path is the channel between the male and female rotors and the cusp of the intersecting rotor bores sometimes described as the blow hole or leakage triangle.
  • Another important leakage path is between the rotor tips and the casing bore, especially in the case of the slower rotating rotor, in which case there is a relatively long time during which leakage flow can occur.
  • both the induction side blow hole and discharge side blow hole should be kept to a minimum in order to reduce leakage between adjacent lobes.
  • Such an application where the screw machine would be used as an expander and compressor simultaneously would be to regulate the mass flow of air delivered to an internal combustion engine replacing the throttle valve. The air is expanded inside the expander/compressor then recompressed and delivered to the engine.
  • a rotary positive displacement machine comprises a pair of rotors provided with intermeshing screw or helical lobes housed in casing means; and drive means for separate driving of the rotors; a first of the rotors, the male rotor, having a lobe cf symmetric transverse profile, with varying centres of curvature; the profiles of the rotors being produced by a co-generation process while the opposite flanks of the female rotor lobe diverge at the periphery of the lobe.
  • the slower rotating rotor (usually the female) has a peripheral land on the lobes of relatively wide form providing a long leak path between the peripheral lands and the casing means.
  • the basic rotor profile is a combination of point and line generated and is symmetric in nature.
  • Fig 1 - shows a plan view of a screw type positive displacement machine
  • Fig 2 - is a transverse section through the rotors of the machine showing the rotor profiles as used in an engine supercharger/expander machine;
  • Fig 3 - shows the profile of Fig 2 to a larger scale to highlight to rotor profile
  • Fig 4 shows a detail of Fig 1.
  • a screw compressor or pump 1 comprises intermeshing male and female rotors 2, 3 having helical lobes 4, 5 respectively, housed in a casing 6.
  • Each of the lobes 4, 5 has leading (4L, 5L) and trailing surfaces (4T, 5T) respectively
  • the shafts of the rotors 2, 3 are carried by bearings 7, while a drive (not shown) is connectable to one of the shafts 8.
  • Gears 9, 10 serve for individual driving of the rotors 2, 3 , as distinct from an arrangement where one of the rotors is driven directly from the other via lobe engagement. This enables the machine 1 to operate in a dry mode i.e. without lubricant in the rotors as there is no requirement for torque (force) transmission between the rotors, and this is beneficial for the particular uses intended for compressor (pump) machines in accordance with the present invention.
  • Figs 2 and 3 show the rotor profile preferred for the supercharger of an internal combustion engine.
  • the profile of the male lobe 4 is of sophisticated symmetric form, that is to sav other than a simple semi-circular (symmetric) profile, symmetry being present about the mid-axis M-M and the profile curves having different centres of curvature.
  • the design of rotor profile can be categorised as one of the following:
  • a circular profile which is in established use in air and gas compressors has the advantage that there are no trapped pockets which produce negative torque.
  • Generated profiles can be point generated and, or, line generated.
  • One profile section or point on either the male or female rotor generates the corresponding profile on the meshing rotor.
  • the benefits of a point generated profile is that the blow hole size can be reduced and the volume of fluid which can be displaced is greater than for a comparable circular profile. However, the sealing line length will be greater.
  • the lobe profiles of the present machine 1 are obtained by a co-generation process, that is the profile shape of one lobe is produced by the line traced out by a point or line on the other intermeshing lobe as it moves.
  • the profile can be summarised as follows:
  • the portion RS is generated by the male tip portion SV is generated by point N; and VW may be a straight line.
  • portion NP is generated by point V on rotor 3
  • portion PQ is generated by line VW on rotor 3
  • QT is generated by point W.
  • C j yr and C R are the pitch circles of the male and female rotors respectively, while Cjyjo and Cpg re t e corresponding outside circles.
  • the portions VW on the opposed lobe flanks of the female rotor 3 diverge at the periphery of the rotor to facilitate rotor manufacture.
  • blow holes or leakage triangles which occur at the zone marked B in Fig 1: Fig 4 shows the detail to a larger scale looking in the axial direction of the machine.
  • the blow holes will be present at both the high pressure and low pressure sides of the machine, but with the machine operating as an ordinary gas compressor with a set operational direction leakage is critical only via one side (the high pressure side) and the size of the blow holes at the other side is not really critical.
  • a further feature of the profile is that the peripheral land 12 on at least one of the rotors 2, 3 can be relatively wide so forming a choke gap between the rotor and the casing- 6 thereby mitigating against leakage via this path: in the profile of Fig 2 the peripheral land on the slower rotating (female) rotor is relatively wide.
  • the leakage between the rotor tips 12 and the bore of the casing 6 is reduced by the present invention.
  • the above machine 1 can be provided advantageously with a suitable variable area inlet oor .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Machine à déplacement positif rotatif fonctionnant comme compresseur ainsi que détenteur et comprenant un boîtier (6) contenant des rotors (2, 3) mâles et femelles à engrenage, le boîtier (6) comprenant un orifice d'entrée et un orifice de sortie de fluide pour le fluide devant être comprimé ou expansé, et un dispositif d'entraînement (9, 10) permettant d'entraîner les rotors (2, 3) séparément l'un de l'autre de telle sorte que la machine puisse fonctionner comme une machine sèche. La mise en contact des rotors (2, 3) s'effectue par l'intermédiaire des lobes (4, 5) dont les profils sont obtenus grâce à un procédé de génération conjointe, le lobe mâle (4) présentant un profil transversal symétrique de courbure variable alors que les flancs opposés (5L, 5T) du lobe femelle (5) sont généralement concaves mais comportent une partie sensiblement droite située sur la pointe et agencée de telle sorte que le lobe femelle (5) soit divergent à la pointe. La machine permet de réduire les chambres de fuite pour les modes de fonctionnement comme compresseur aussi bien que comme détendeur.
EP93904233A 1992-02-19 1993-02-19 Machine du type a rotor a vis Expired - Lifetime EP0627041B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9203521 1992-02-19
GB929203521A GB9203521D0 (en) 1992-02-19 1992-02-19 Screw rotors type machine
PCT/GB1993/000349 WO1993017223A1 (fr) 1992-02-19 1993-02-19 Machine du type a rotor a vis

Publications (2)

Publication Number Publication Date
EP0627041A1 true EP0627041A1 (fr) 1994-12-07
EP0627041B1 EP0627041B1 (fr) 1999-09-29

Family

ID=10710675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93904233A Expired - Lifetime EP0627041B1 (fr) 1992-02-19 1993-02-19 Machine du type a rotor a vis

Country Status (4)

Country Link
EP (1) EP0627041B1 (fr)
DE (1) DE69326606T2 (fr)
GB (1) GB9203521D0 (fr)
WO (1) WO1993017223A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7530217B2 (en) 2005-12-16 2009-05-12 General Electric Company Axial flow positive displacement gas generator with combustion extending into an expansion section
US7726115B2 (en) 2006-02-02 2010-06-01 General Electric Company Axial flow positive displacement worm compressor
US8708643B2 (en) 2007-08-14 2014-04-29 General Electric Company Counter-rotatable fan gas turbine engine with axial flow positive displacement worm gas generator
US7854111B2 (en) 2008-03-07 2010-12-21 General Electric Company Axial flow positive displacement turbine
US8328542B2 (en) 2008-12-31 2012-12-11 General Electric Company Positive displacement rotary components having main and gate rotors with axial flow inlets and outlets

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT454201A (fr) * 1947-07-16
US3289600A (en) * 1964-03-13 1966-12-06 Joseph E Whitfield Helically threaded rotors for screw type pumps, compressors and similar devices
SE312394B (fr) * 1965-05-10 1969-07-14 A Lysholm
GB1294210A (en) * 1970-09-29 1972-10-25 Le Ni I K I Khim Mash Improvements in or relating to meshing screw-rotor machines for compressible fluids
SE429783B (sv) * 1981-12-22 1983-09-26 Sullair Tech Ab Rotorer for en skruvrotormaskin

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9317223A1 *

Also Published As

Publication number Publication date
DE69326606D1 (de) 1999-11-04
DE69326606T2 (de) 2000-05-04
WO1993017223A1 (fr) 1993-09-02
GB9203521D0 (en) 1992-04-08
EP0627041B1 (fr) 1999-09-29

Similar Documents

Publication Publication Date Title
US5702240A (en) Rotary positive displacement blower having a diverging outlet part
JPS62121885A (ja) 回転容積形ブロワ及びその使用方法
KR910002727B1 (ko) 양변위(positive-displacement) 회전장치 및 그 장치용의 로우터
EP1887184B1 (fr) Appareil de commande de déplacement positif rotatif
US4576558A (en) Screw rotor assembly
US10890181B2 (en) Enhancing fluid flow in gerotor systems
US3773444A (en) Screw rotor machine and rotors therefor
US3986801A (en) Screw compressor
JPS643295A (en) Vane type compressor
EP0627041B1 (fr) Machine du type a rotor a vis
JPS62135687A (ja) 逆流通路を備える回転容積形ブロワ
US4679996A (en) Rotary machine having screw rotor assembly
US4636156A (en) Screw rotor machines with specific tooth profiles
US4981424A (en) High pressure single screw compressors
US4193749A (en) Screw blower
US4089625A (en) Rotary gas machine
US4076469A (en) Rotary compressor
US11708832B2 (en) Cooled dry vacuum screw pump
US4437818A (en) Oil-free rotary compressor
US4614484A (en) Rotary screw compressor with specific tooth profile
CN110388319B (zh) 具有同步节能器端口的螺杆压缩机
US5002472A (en) Profiles of screw-type rotors for rotary machines conveying a gaseous fluid
US7163387B2 (en) Meshing helical rotors
RU2282063C1 (ru) Роторная машина
US4033708A (en) Rotary compressor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19940913

17Q First examination report despatched

Effective date: 19951002

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SPRINTEX AUSTRALASIA PTY LTD.

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69326606

Country of ref document: DE

Date of ref document: 19991104

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: FR

Ref legal event code: CA

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20110216

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20120221

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20120215

Year of fee payment: 20

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120219

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69326606

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20130220