EP0381413A2 - Pompe à vis excentrée - Google Patents

Pompe à vis excentrée Download PDF

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Publication number
EP0381413A2
EP0381413A2 EP90300894A EP90300894A EP0381413A2 EP 0381413 A2 EP0381413 A2 EP 0381413A2 EP 90300894 A EP90300894 A EP 90300894A EP 90300894 A EP90300894 A EP 90300894A EP 0381413 A2 EP0381413 A2 EP 0381413A2
Authority
EP
European Patent Office
Prior art keywords
rotor
locations
stator
interference
minor diameter
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.)
Withdrawn
Application number
EP90300894A
Other languages
German (de)
English (en)
Other versions
EP0381413A3 (fr
Inventor
Lindsay Thomas Mathewson
Geoffrey Harold May
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.)
NOV Process and Flow Technologies UK Ltd
Original Assignee
Mono Pumps 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 Mono Pumps Ltd filed Critical Mono Pumps Ltd
Publication of EP0381413A2 publication Critical patent/EP0381413A2/fr
Publication of EP0381413A3 publication Critical patent/EP0381413A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits

Definitions

  • the present invention relates to helical gear pumps. These comprise an outer stator member with a helical female gear formation of n starts, an inner rotor rotatable within said stator having a helical male gear formation of the same pitch of n ⁇ 1 starts, means being provided to cause the rotor to rotate and orbit relative to the stator.
  • the rotor has n-1 starts.
  • the outer stator member is formed of a resilient, rubber like material and the rotor is formed of metal, usually steel.
  • a typical example is shown in U S Patent 4773834.
  • the seal is improved if the interference between the rotor and stator is increased, but this causes problems of requiring a greater drive power, heat generation and of wear on the two parts, particularly the stator.
  • the helical gear formation of the rotor is such as to provide peaks and troughs in the rotor and experience has shown that wear on the rotor is normally initiated close to the rotor major diameter or peak.
  • a coating on the rotor of modified chromium oxide this being applied by plasma coating.
  • modified chromium oxide as a coating medium results in a thicker deposition of the chromium oxide at the minor diameter or trough i.e. where it is least required.
  • a helical gear pump comprising an outer stator member with a helical female gear formation of two starts, an inner rotor rotatable within said stator and having a helical male gear formation of the same pitch of one start, and means to cause said rotor to rotate and orbit relative to said stator, the rotor having a major diameter D, a minor diameter d, a pitch P and an eccentricity e, the shape of the helical female gear formation of the stator consisting of two semi-circular cross section-portions joined by two straight line portions, wherein the interference between the rotor and the stator is arranged to be such that the interference is significantly more at the locations of the minor diameter d than at the locations of the major diameter D, and wherein interference with the rotor diminishes progressively between the straight line and the semi-circular cross-section portions of the helical female gear formation of the stator.
  • the interference at the location of the minor diameter d is considerably greater than the interference at the locations of the major diameter and the ratio d/e of the minor diameter d to eccentricity e is at least 8.
  • the ratio P/e of the rotor pitch P to the eccentricity e is at least 17.5.
  • the metal of the rotor is plasma coated with a coating of modified chromium oxide.
  • the base metal of the rotor, prior to plasma coating is machined so that in the region of the location of major diameter D, the thickness of the plasma coating is less and in the region of the locations of minor diameter d, the thickness of the plasma coating is greater than in the remainder of the rotor, while allowing the interference to be significantly more at the locations of the minor diameter d than at the locations of the major diameter D.
  • the pump illustrated in Figure 4 includes a casing 1 having an inlet 2 and an outlet 3.
  • a drive shaft 4 which may be of the conventional rigid or flexible type, passes through a bulkhead 5 via a bearing and/or seal assembly 6.
  • a stator 8 is secured in the casing 1 and includes a two start female helical gear formation 9.
  • a rotor 22 having a one start male helical gear formation 11 is driven by a motor (not shown) and drive shaft 4 to rotate and orbit in the stator 8.
  • stator 8 is shown schematically, with the female helical gear form shown in full lines and the path of the rotor shown in dotted lines.
  • the rotor path is substantially coterminous with the stator form shown in full line.
  • the stator form consists of two substantial semi-circular zones 10,12 and, on each side, two sets of straight line portions 14,14,16,16, the sets 14,16 meeting at the horizontal centre line 18 of the stator form.
  • the semi circular portions 10,12 with the straight line portions 14,16 there is a sharp change in interference and experience has shown that there tends to be a leak path as is shown in the enlarged encircled portion in Figure 1B.
  • the stator form is modified slightly so that the portions 14,16 essentially form a straight line.
  • the dimensions of the rotor are chosen so that there is a significant interference as can be seen by the fact that the chain dotted indication of the rotor path 20 is shown, at least along the straight line portions 14,16, and a significant part of the semi-circular portions 10,12 of the stator forms, to be outside the stator form. The interference therefore diminishes progressively and smoothly from the straight line to the semi-circular portion.
  • the interference at the locations of the major diameter are not significantly changed so that the interference at the locations at the minor diameter is significantly greater than the interference at the locations of the major diameter.
  • the rotor 22 is shown as being sprayed with a coating, such as modified chromium oxide, by a plasma gun 24.
  • a coating such as modified chromium oxide
  • the gap of the rotor from the plasma gun is shown as a distance g. It will be appreciated that the gap at the troughs 28 of the rotor will be g + 2e. This tends to produce a greater thickness of coating at the troughs 28 than at the peaks 26.
  • the base metal of the rotor is machined, with a construction according to the invention, so that in the region of the locations of major diameter, that is at the peaks 26, the thickness of the plasma coating is less and in the region of the locations of minor diameter, that is in the troughs, the thickness of the plasma coating is greater than in the remainder of the rotor, while allowing the interference to be significantly more at the locations of the minor diameter than at the locations of the major diameter.
  • the ratio d/e of the minor diameter d to the eccentricity e is at least 8 and the ratio P/e of the pitch P to the eccentricity e is at least 17.5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP19900300894 1989-02-01 1990-01-29 Pompe à vis excentrée Withdrawn EP0381413A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8902230A GB2228976B (en) 1989-02-01 1989-02-01 Helical gear pump
GB8902230 1989-02-01

Publications (2)

Publication Number Publication Date
EP0381413A2 true EP0381413A2 (fr) 1990-08-08
EP0381413A3 EP0381413A3 (fr) 1990-12-05

Family

ID=10650971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900300894 Withdrawn EP0381413A3 (fr) 1989-02-01 1990-01-29 Pompe à vis excentrée

Country Status (4)

Country Link
EP (1) EP0381413A3 (fr)
FI (1) FI900500A7 (fr)
GB (1) GB2228976B (fr)
NO (1) NO172200C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627556A1 (fr) * 1993-03-18 1994-12-07 Praxair S.T. Technology, Inc. Rotor revêtu de carbides ou borides pour moteur ou pompe à déplacement positif
EP0985826A1 (fr) * 1998-09-09 2000-03-15 Mono Pumps Limited Pompe Moineau
RU2228443C1 (ru) * 2003-03-11 2004-05-10 Общество с ограниченной ответственностью фирма "Радиус-Сервис" Ротор винтовой гидромашины
WO2018162360A1 (fr) 2017-03-07 2018-09-13 Seepex Gmbh Pompe à vis sans fin excentrée

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5498142A (en) * 1995-05-30 1996-03-12 Kudu Industries, Inc. Hardfacing for progressing cavity pump rotors
CN105240269A (zh) * 2014-06-26 2016-01-13 水利部科技推广中心 双端u形螺纹离式螺旋体微纳米气泡装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB629454A (en) * 1947-11-04 1949-09-20 Fmc Corp Improvements in gear type pumps
BE651030A (fr) * 1963-07-25
DE1553146A1 (de) * 1965-09-16 1970-02-05 Netzsch Maschinenfabrik Laeufer fuer Schneckenpumpen
DE1553148A1 (de) * 1966-03-12 1969-07-03 Netzsch Maschinenfabrik Laeufer fuer Schneckenpumpen
DE2017620C3 (de) * 1970-04-13 1981-07-16 Gummi-Jäger KG GmbH & Cie, 3000 Hannover Exzenterschneckenpumpe
FR2343906A1 (fr) * 1976-03-09 1977-10-07 Mecanique Metallurgie Ste Gle Perfectionnements aux stators de pompes a vis
CA1208072A (fr) * 1983-08-16 1986-07-22 Minoru Saruwatari Pompe a cavite progressive

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627556A1 (fr) * 1993-03-18 1994-12-07 Praxair S.T. Technology, Inc. Rotor revêtu de carbides ou borides pour moteur ou pompe à déplacement positif
EP0985826A1 (fr) * 1998-09-09 2000-03-15 Mono Pumps Limited Pompe Moineau
US6220837B1 (en) 1998-09-09 2001-04-24 Mono Pumps Limited Progressing cavity pump having a ratio of eccentricity, rotor diameter and stator lead
AU754641B2 (en) * 1998-09-09 2002-11-21 Mono Pumps Limited Progressing cavity pump
RU2228443C1 (ru) * 2003-03-11 2004-05-10 Общество с ограниченной ответственностью фирма "Радиус-Сервис" Ротор винтовой гидромашины
WO2004081347A1 (fr) * 2003-03-11 2004-09-23 Obschestvo S Ogranichennoi Otvetstvennostyu Firma Radius-Servis Rotor destine a une unite hydraulique helicoidale
WO2018162360A1 (fr) 2017-03-07 2018-09-13 Seepex Gmbh Pompe à vis sans fin excentrée
DE102017104768A1 (de) * 2017-03-07 2018-09-13 Seepex Gmbh Exzenterschneckenpumpe

Also Published As

Publication number Publication date
GB2228976A (en) 1990-09-12
FI900500A7 (fi) 1990-08-02
GB8902230D0 (en) 1989-03-22
EP0381413A3 (fr) 1990-12-05
NO900446L (no) 1990-08-02
GB2228976B (en) 1993-08-11
FI900500A0 (fi) 1990-01-31
NO172200C (no) 1993-06-16
NO900446D0 (no) 1990-01-31
NO172200B (no) 1993-03-08

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