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EP4577728A1 - Joint d'étanchéité de pompe à spirale, pompe à spirale et procédé - Google Patents

Joint d'étanchéité de pompe à spirale, pompe à spirale et procédé

Info

Publication number
EP4577728A1
EP4577728A1 EP23758629.2A EP23758629A EP4577728A1 EP 4577728 A1 EP4577728 A1 EP 4577728A1 EP 23758629 A EP23758629 A EP 23758629A EP 4577728 A1 EP4577728 A1 EP 4577728A1
Authority
EP
European Patent Office
Prior art keywords
scroll
seal
scroll pump
annular protrusion
pump seal
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.)
Pending
Application number
EP23758629.2A
Other languages
German (de)
English (en)
Inventor
Martin ZAHRADKA
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.)
Edwards sro
Original Assignee
Edwards sro
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 Edwards sro filed Critical Edwards sro
Publication of EP4577728A1 publication Critical patent/EP4577728A1/fr
Pending legal-status Critical Current

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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • 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
    • F01C19/00—Sealing arrangements in rotary-piston machines or engines
    • F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
    • 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
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • 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
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
    • F04C18/0253—Details concerning the base

Definitions

  • One aspect provides a scroll pump seal for inhibiting fluid flow into and out of a pumping chamber defined between a first scroll and a second scroll of a scroll pump, the first and second scroll being configured for relative orbital motion
  • the scroll pump seal comprising: an annular body adapted to be mounted about a shaft of the scroll pump and fixed relative to one of the first scroll and the second scroll; and a first sealing element comprising an inner annular protrusion and an outer annular protrusion extending from an axial end surface of the annular body, the inner annular protrusion and the outer annular protrusion being configured to contact the other one of the first scroll and the second scroll that the annular body is not fixed relative to.
  • the scroll pump seal comprises a second sealing element for inhibiting fluid flow between the annular body and the shaft of the scroll pump, the second sealing element comprising a further annular protrusion (or lip) extending from a radially inner surface of the annular body.
  • the second sealing element comprises a second further annular protrusion.
  • the seal created by the second sealing element can be strengthened. Accordingly, leakage into and out of the pumping chamber can be further mitigated.
  • the further and the second further annular protrusions together define a V-shape. In this way, one of the first further annular protrusion and the second further annular protrusion is particularly proficient at preventing leakage out of the pumping chamber and the other is particularly proficient at preventing leakage into the pumping chamber. This may reduce the total leakage.
  • the scroll pump seal comprises a biasing member configured to bias the first sealing element towards the other one of the orbiting scroll and the fixed scroll that the annular body is not fixed relative to. In this way, the sealing contact can be strengthened, thereby reducing leakage.
  • the biasing member is integral to the annular body. In this way, the biasing member can be manufactured or formed with the scroll pump seal. In some embodiments, the biasing member is made of a same material as the annular body.
  • the first sealing element comprises an intermediate annular protrusion (or lip) extending from the axial end surface of the annular body between the inner annular protrusion and the outer annular protrusion.
  • an additional seal can be provided to improve the seal formed by the scroll pump seal.
  • This embodiment can be particularly effective in combination with a biasing member to help all three protrusions (or sealing members or lips) to have sufficient contact with the other one of the first scroll and the second scroll that the annular body is not fixed relative to.
  • the annular body and the first sealing element are integral with each other. In some embodiments, the annular body and the first sealing element are made of a same material. In some embodiments, the body and the second sealing element are integral with each other. In some embodiments, the annular body and the second sealing element are made of a same material.
  • the annular body comprises an annular groove containing an O-ring for fixing the annular body to the one of the first scroll and the second scroll and for inhibiting fluid flow between the annular body and the one of the first scroll and the second scroll.
  • the scroll pump seal can be fixed to the appropriate scroll and fluid flow between the scroll pump seal and the scroll is inhibited or prevented.
  • the scroll pump seal is made of at least one polymer, optionally wherein the at least one polymer is Teflon filled polyamide.
  • a further aspect provides a scroll pump comprising: a first scroll and a second scroll configured for relative orbital motion; a shaft configured when driven to impart the relative orbital motion of said first scroll and said second scroll; a scroll pump seal according to one aspect, said scroll pump seal being mounted about said shaft and fixed relative to one of said first scroll and said second scroll.
  • the scroll pump seal is made of a same material as tip seals of the first and second scrolls.
  • a yet further aspect provides a method of positioning a scroll pump seal comprising: mounting a scroll pump seal according to the one aspect about a shaft; and fixing said scroll pump seal relative to one of a first scroll and a second scroll such that said first sealing element contacts the other one of said first scroll and said second scroll that said annular seal is not fixed relative to, said first and second scroll being configured for relative orbital motion.
  • the method includes positioning an 0-ring inside the annular groove defined in the annular body of the scroll pump seal. This may be performed prior to fixing the scroll pump seal relative to one of the first and the second scrolls. However, the steps of the yet further aspect may be performed in any order.
  • Figure 1 shows a portion of a front sectional view through a scroll pump according to one embodiment
  • a third protrusion can be added to either the first or second sealing elements to further enhance the seal.
  • the third protrusion may be added between the already angled or V-shaped protrusions.
  • the seal 10 is positioned in an opening defined between the first scroll 12, the second scroll 14, and the shaft 16 at a location radially inward of the pumping chamber 30 (shown in Figure 2).
  • the annular body 18 is mounted about the shaft 16 and is fixed relative to the first scroll 12.
  • the biasing mechanism 40 comprises a spring located on the axial end of annular body 18 opposite to that which the first sealing element 20 is located. In this way, the biasing mechanism 40 is configured to push against the first scroll 12 such that the inner and outer annular protrusions 22, 24 and the intermediate protrusion 36 are encouraged towards the second scroll 14 to enhance the strength of the seal.
  • Figure 4 shows a flowchart of a method of positioning a scroll pump seal, for example, one of scroll pump seals 10, 100, 1000.
  • the scroll pump seal is mounted about a shaft of a scroll pump, for example, shaft 16.
  • the scroll pump seal is fixed relative to one of a first scroll and a second scroll of the scroll pump, for example, scroll 12 and scroll 14, such that a first sealing element of the scroll pump seal contacts the other one of the first scroll and the second scroll that the annular seal is not fixed relative to.
  • the first and the second scroll are configured for relative orbital motion.
  • embodiments provide a seal (scroll pump seal) for sealing orbiting or rotating movement.
  • One seal in some embodiments with 4 lips (2 pairs) that can protect against internal and external leaks.
  • One pair is touching the orbiting scroll and second pair is touching the shaft. It is fitted into a drilling (opening) in the fixed scroll and sealed by the piston O-ring in the groove by the 0-ring. It can seal to surface perpendicular to shaft and on the shaft as well. Provides effective sealing even with light pressure differences to 1bar. Using counter facing lips allows for faster bed-in and better sealing function.
  • This sealing solution improves GB2503723B and adds sealing against unwanted loss of the pumped media from pump. It can be expanded and provide additional sealing even on the shaft.
  • the seal is made from the same material as the tip seal which may be EKL HS11041 (PA, PTFE filled) or any polymer material with good sealing properties and sufficient wear resistance.
  • PA EKL HS11041
  • PTFE PTFE filled
  • the idea is that there is always slight overpressure (1 ,2bar(a)) in the centre of a fixed scroll and that gas wants to escape by way of the lowest resistance which is in majority by the exhaust. However, gas can escape from the mechanism around the front shaft bearing to the motor stator. Opposite issues arise when the pump is stopped and inside the mechanism pressure lower than surrounding atmosphere equalize. Embodiments seek to impede rapid ambient air rushing to the pumping mechanism.
  • Embodiments provide a sealing solution with a crown shape sealing element actuated by a spring and additionally sealed around by an O-ring. Leak tightness values of at least 10E-3 mbar*l/s can be achieved.
  • the spring can be integrated to the seal by careful design for required stiffness and flexibility

Landscapes

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

Abstract

L'invention concerne un joint d'étanchéité de pompe à spirale permettant de stopper l'écoulement du fluide dans une chambre de pompage définie entre une première spirale et une seconde spirale d'une pompe à spirale et hors de celle-ci. Les première et seconde spirales sont conçues pour un mouvement orbital relatif. Le joint d'étanchéité de pompe à spirale comprend : un corps annulaire conçu pour être monté autour d'un arbre de pompe à spirale et fixé par rapport à la première spirale ou à la seconde spirale ; et un premier élément d'étanchéité comprenant une saillie annulaire interne et une saillie annulaire externe s'étendant à partir d'une surface d'extrémité axiale du corps annulaire, la saillie annulaire interne et la saillie annulaire externe étant conçues pour entrer en contact avec l'autre spirale, soit celle par rapport à laquelle le corps annulaire n'est pas fixé. De cette manière, le joint d'étanchéité de pompe à spirale peut constituer un joint d'étanchéité amélioré pour stopper l'écoulement du fluide dans une chambre de pompage et hors de celle-ci. Par conséquent, les fuites peuvent être réduites et les performances de pompage de la pompe à spirale sont améliorées.
EP23758629.2A 2022-08-22 2023-08-21 Joint d'étanchéité de pompe à spirale, pompe à spirale et procédé Pending EP4577728A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2212172.7A GB2621827B (en) 2022-08-22 2022-08-22 Scroll pump
PCT/EP2023/072885 WO2024042012A1 (fr) 2022-08-22 2023-08-21 Joint d'étanchéité de pompe à spirale, pompe à spirale et procédé

Publications (1)

Publication Number Publication Date
EP4577728A1 true EP4577728A1 (fr) 2025-07-02

Family

ID=83902257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23758629.2A Pending EP4577728A1 (fr) 2022-08-22 2023-08-21 Joint d'étanchéité de pompe à spirale, pompe à spirale et procédé

Country Status (5)

Country Link
EP (1) EP4577728A1 (fr)
JP (1) JP2025523234A (fr)
CN (1) CN119452150A (fr)
GB (1) GB2621827B (fr)
WO (1) WO2024042012A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000073969A (ja) * 1998-08-27 2000-03-07 Tokico Ltd スクロール式流体機械
JP2001227480A (ja) * 2000-02-14 2001-08-24 Mitsubishi Heavy Ind Ltd スクロール型流体機械
US6695599B2 (en) * 2001-06-29 2004-02-24 Nippon Soken, Inc. Scroll compressor
US7338265B2 (en) * 2005-03-04 2008-03-04 Emerson Climate Technologies, Inc. Scroll machine with single plate floating seal
DE102008054753A1 (de) * 2008-12-16 2010-06-17 Robert Bosch Gmbh Innenzahnradpumpe
GB2503723B (en) * 2012-07-06 2015-07-22 Edwards Ltd Scroll pump with axial seal
CN108278204B (zh) * 2018-02-07 2023-12-19 宁波汇峰聚威科技股份有限公司 一种涡旋压缩机的密封装置
CN208203565U (zh) * 2018-05-03 2018-12-07 宁波汇峰聚威科技股份有限公司 一种涡旋压缩机的密封结构

Also Published As

Publication number Publication date
CN119452150A (zh) 2025-02-14
WO2024042012A1 (fr) 2024-02-29
GB2621827B (en) 2024-11-20
GB2621827A (en) 2024-02-28
JP2025523234A (ja) 2025-07-17
GB202212172D0 (en) 2022-10-05

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