EP0223335A2
Expired / Lapsed
EP
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Improvements in or relating to rotary positive displacement fluid machines
Assignee: Weir Pumps Ltd
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Filing: 1986-08-08
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Granted: —
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Expires: 2006-08-08
Abstract
Abstract A positive displacement pump is described which is particularly suitable for pumping a multiphase fluid mixture, for example, production oil, water, gas or solids in suspension from offshore or onshore oil fields. The pump has a casing (l) within which is disposed an outer rotor (5) having internal helical lobes (8) and an internal rotor (ll) disposed within the outer rotor (5) and having external helical lobes which co-operate to define cavities (l7) therebetween. The outer rotor (5) and inner rotor (ll) are both rotatable relative to each other about respective fixed axes (l5,l6) which are parallel but spaced from each other so that a working medium can be axially conveyed, via the cavities, through the machine. In a preferred arrangement the inner (ll) and outer rotor (5) have portions of opposed hand whereby the working medium is conveyed in opposed directions between each end of the machine and an intermediate location. The pump can be connected in series or parallel with like pumps to form multi-pump arrangements.
Inventors
- 👤 Michael Leslie Ryall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 21:13
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/10; F01C1/107
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
82 words
A positive displacement fluid machine comprising a casing; a first member having internal helical lobes mounted within said casing; and a second member having external helical lobes mounted within said casing for rotation relative to said first member whereby co-operating helical lobes on the first and second members define cavities therebetween wherein, on relative rotation of the first and second members, a working medium can be conveyed axially through the machine characterised in that both first and second helically-lobed members are rotatable.
Claim 2
Dependent Claim
82 words
A positive displacement fluid machine comprising a casing; a first member having internal helical lobes mounted within said casing; and a second member having external helical lobes mounted within said casing for rotation relative to said first member whereby co-operating helical lobes on the first and second members define cavities therebetween wherein, on relative rotation of the first and second members, a working medium can be conveyed axially through the machine characterised in that both first and second helically-lobed members are rotatable.
Claim 3
Dependent Claim
33 words
A positive displacement fluid machine as claimed in claim l, characterised in that the first and second members are rotatable about respective fixed axes which are parallel to but spaced from each other.
Claim 4
Dependent Claim
45 words
A positive displacement fluid machine as claimed in claim l or 2, in which rotation of the helical lobes of the first member is effected on rotation of the second helically-lobed member due to meshing engagement between the lobes of said first and second members.
Claim 5
Dependent Claim
52 words
A positive displacement fluid machine as claimed in any of claims l to 3, characterised in that the helical lobes of both first and second members have two portions of opposed hand whereby the working medium can be conveyed in opposed directions between each end of the machine and an intermediate location.
Claim 6
Dependent Claim
35 words
A positive displacement fluid machine as claimed in any preceding claim characterised in that said helical lobes have an axial lead which is constant along the length on both said first and said second members.
Claim 7
Dependent Claim
44 words
A positive displacement fluid machine as claimed in any of claims l to 4 characterised in that said helical lobes have an axial lead which varies progressively or in a series of steps along the length on both said first and said second member.
Claim 8
Dependent Claim
31 words
A positive displacement fluid machine as claimed in any preceding claim characterised in that said first member has n+l internal helical lobes and said second member has n external helical lobes.
Claim 9
Dependent Claim
26 words
A positive displacement fluid machine as claimed in any preceding claim characterised in that said second member comprises a drive means for rotating said second member.
Claim 10
Dependent Claim
47 words
A positive displacement fluid machine as claimed in claim 8 characterised in that the drive means is a rotary drive unit having a drive shaft, said drive shaft being rotatable in response to fluid flow through the rotary drive unit in order to rotate said second member.
Claim 11
Dependent Claim
64 words
l0. A positive displacement fluid machine as claimed in claim 9 characterised in that said casing and said second member define a cavity within which is disposed a hydrostatic sealing means, said sealing means being movable axially to seal against a face of said cavity when said rotary drive and said pump is inoperative to prevent leakage of said working medium from said machine.
Claim 12
Dependent Claim
34 words
A positive displacement fluid machine as claimed in any preceding claim characterised in that a plurality of said machines are connected in series or in parallel with respective second members being mechanically coupled together.
Claim 13
Dependent Claim
29 words
A positive displacement fluid machine as claimed in claim ll characterised in that when said machines are connected in series, said second members rotate about the same longitudinal axis.
Claim 14
Dependent Claim
32 words
A positive displacement fluid machine as claimed in claim ll characterised in that when said machines are connected in parallel, each first member is coupled to a separate shaft and rotary drive.
Claim 15
Dependent Claim
24 words
A positive displacement pump as claimed in any one of claims 8 to l3 characterised in that said drive means is a fluid turbine.
Claim 16
Dependent Claim
25 words
A positive displacement pump as claimed in claims 8 to l3 characterised in that said rotary drive is an electric motor or internal combustion engine.
Claim 17
Dependent Claim
40 words
A positive displacement pump as claimed in any preceding claim characterised in that the angular position of said first and said second members can be phased relative to each other to prevent meshing contact between the first and second members.
Claim 18
Dependent Claim
42 words
A positive displacement pump as claimed in any one of claims 2 to l6 characterised in that said parallel axes of said first and second members and said casing can be arranged horizontally, vertically or at an angle between horizontal and vertical.
Claim 19
Independent Claim
20 words
A method of transporting a multi-phase mixture comprising utilising a positive displacement fluid machine as claimed in any preceding claim.
References Cited (Backward Citations)
No citation records indexed.
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