EP0502684A1 - Verdrängungspumpe mit rotierendem Kolben - Google Patents

Verdrängungspumpe mit rotierendem Kolben Download PDF

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Publication number
EP0502684A1
EP0502684A1 EP92301781A EP92301781A EP0502684A1 EP 0502684 A1 EP0502684 A1 EP 0502684A1 EP 92301781 A EP92301781 A EP 92301781A EP 92301781 A EP92301781 A EP 92301781A EP 0502684 A1 EP0502684 A1 EP 0502684A1
Authority
EP
European Patent Office
Prior art keywords
rotor
port
pump
hub portion
disc
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Withdrawn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
EP92301781A
Other languages
English (en)
French (fr)
Inventor
Leslie John Budgen
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.)
BOC Group Ltd
Original Assignee
BOC Group 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 BOC Group Ltd filed Critical BOC Group Ltd
Publication of EP0502684A1 publication Critical patent/EP0502684A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F04C18/123—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 radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth

Definitions

  • This invention relates to mechanical vacuum pumps and more particularly to such pumps incorporating rotor pairs of the Claw type.
  • Vacuum pumps incorporating a pair of Claw rotors mounted on respective shafts and positioned for interengagement in a chamber of the pump as the shafts are synchronously rotated in opposite directions are well known.
  • Each pump may comprise one or more such chambers with one rotor of each pair being mounted on a first shaft and the other rotor of each pair being mounted on a second shaft.
  • a multi-chamber pump may employ Claw type rotors exclusively in each chamber or may also have a chamber or chambers having Roots type rotors therein.
  • the maximum size, ie. cross-sectional area, of the inlet to, and also the outlet from, the chamber is dictated by the shape of the claw rotor profile.
  • the shape and size of the inlet and outlet must be such that:
  • Figure 1 The shape of a typical inlet for an existing pump design is shown schematically in Figure 1 which is a transverse section through the pump. It shows two contra-rotatable shafts 1, 2 having mounted thereon respective claw rotors 3,4 which, in use, rotate in the directions shown by the arrows within the confines of the chamber walls 5.
  • the rotor 3 communicates, during part of its cycle, with generally arcuate inlet port 6 in the uppermost wall of the chamber and positioned about the shaft and between (with clearances) the diameter of the rotor hub (or base circle) 7 (completed by dotted lines 8) and the innermost part of the rotor cut-out 9.
  • the rotor 4 similarly communicates with an outlet port 10 in the lowermost wall of the chamber and positioned in relation to the rotor 4 in a similar manner to the inlet port 6 and the rotor 3. In use, therefore communication between the rotors and the respective port occurs when the rotating rotor exposes the port as the cut-out part of the rotor passes across the port. That is the basis of the pump cycle.
  • the present invention is concerned with minimising or even removing such restrictions by allowing for the size of the inlet and/or the outlet of such pumps to be increased commensurate with the overall size of the pump chamber(s).
  • a mechanical vacuum pump comprising at least one pumping chamber having mounted therein on respective contra rotatable shafts a pair of "claw" type rotors arranged for pumping gas through the chamber during a pump cycle from an inlet port to an outlet port, each rotor having a substantially circular hub portion about the shaft one surface of which communicates with a wall of the chamber containing a port but with a part of the hub portion cut away for opening and closing the port at predetermined intervals of the pump cycle and a claw portion extending substantially radially from the hub portion, wherein the surface of at least one rotor which communicates with a port is enlarged relative to the remainder of the rotor and to the hub portion in particular and orifice means are provided therein for communication with the port.
  • Such an arrangement allows the pump to operate in the same manner as the normal pump but with the ability to allow a greater throughput of gas by allowing for a greater port cross-sectional area.
  • the invention is preferably put into effect by securing to the surface of a Claw rotor adjacent the port a disc which by itself forms the surface of the rotor and which defines the interface between the rotor and the wall of the chamber containing the port.
  • the disc has a radius which is larger than that of the hub portion of the rotor itself, ie between the hub portion radius and the radius of the rotor including the additional radial dimension of the claw itself.
  • the disc could be greater than the radius of the rotor including the radial dimension of the claw but this is generally unnecessary.
  • the disc has a diameter which is substantially equal to the rotor including the radial dimension of the claw.
  • the orifice means in the enlarged rotor surface preferably extends from the outer edge of the surface of the disc to a position near the rotor surface and can itself advantageously be approximately circular or square in shape.
  • the radial dimension of such an orifice can therefore be much larger than that possible in the usual rotor "cut-out" portion and, of course, the radial dimension of the port itself may be made correspondingly larger to effect a greater throughput of gas through the port.
  • the invention is applicable to both the chamber inlet port and the chamber outlet port; preferably, it is applied to each port.
  • the invention can advantageously be applied to both ports in all chambers, thereby effecting a lower impedance to gas flow throughout the pump as a whole.
  • the disc (or at least the relevant surface thereof) to be made from a material which minimises friction between it and the wall of the chamber containing the port, for example carbon-graphite or a PTFE coating on the relevant surface should the rotating member touch the stationery members due to, for example, temperature expansion effects.
  • the rotors of the pump can operate with small clearances relative to the pump walls and are thus able to reduce gas leakage (gas slip) therebetween.
  • the pump shown therein is in accordance with the invention and incorporates a modified rotor communicating with the first stage chamber inlet in particular.
  • the pump comprises two contra-rotatable shafts 11,12 having mounted thereon respective Northey or Claw type rotors 13,14 which, in use of the pump, rotate in the directions shown by the arrows within the confines of chamber walls 15.
  • the rotor 13 comprise a substantially circular hub portion 16 having a cut-out portion 17 and claw portion 18.
  • Rotor 14 has a similar construction and the basic positioning and operation of this rotor pair within the chamber walls 15 is standard for this type of vacuum pump.
  • Figure 3 in particular shows an axial section of the rotor arrangement shown in Figure 2. It also shows an inlet port 19 in chamber wall portion 20 and an outlet port 21 in chamber wall portion 22. Whereas the latter is of standard generally arcuate shape and size, the generally arcuate inlet port 19 is substantially larger, particularly in the radial dimension as clearly shown in both Figure 2 and in Figure 3.
  • Figure 3 additionally shows a circular disc 23 securely attached to the surface of the rotor 13 which communicate with the inlet port 19.
  • the disc 9 is therefore adapted for rotation with the rotor 13 in use of the pump within a circular cavity 24 in the chamber wall portion 20 having a size corresponding to that of the disc 23.
  • the disc 23 has a cut-out portion 25 which at the inner end has a shape and size corresponding substantially to the shape and size of the cut-out portion 17 of the rotor 13 and which at the outer end extends to the periphery of the disc 23 as shown in Figure 2 in particular.
  • Figures 4 and 5 show a modified pump to that shown in Figures 2 and 3 in that a second disc 26 is securely fixed to the surface of the rotor 14 which communicates with the outlet port 21.
  • the outlet port 21 can therefore be enlarged on the same basis as inlet port 19.
  • the disc 26 rotates with the rotor 14 within the confines of a cavity 27 in the chamber wall portion 22. In the case of the plate 26, it contains a central aperture to allow the presence of the shaft 12.
  • FIG 6 shows an intermediate chamber of a multiple stage pump with both the inlet port 19 and the outlet port 21 having the benefit of associated discs 23 and 26 respectively.
  • both the discs contain a central aperture to allow for the presence of the shafts 11 and 12 respectively.
  • Figure 7 shows an alternative disc for use either in conjunction with an inlet port or an outlet port in which the cut-out portion 17 does not extend to the periphery of the disc but has the shape shown with a retained circumferential strip as an outer edge to the cut-out portion.
  • these could generally be made of any suitable material. However, they are preferably made from a low friction or self lubricating material (at least on the side communicating with the chamber wall containing the port). PTFE coatings or carbon graphite are preferred in this respect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP92301781A 1991-03-04 1992-03-02 Verdrängungspumpe mit rotierendem Kolben Withdrawn EP0502684A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919104514A GB9104514D0 (en) 1991-03-04 1991-03-04 Improvements to vacuum pumps
GB9104514 1991-03-04

Publications (1)

Publication Number Publication Date
EP0502684A1 true EP0502684A1 (de) 1992-09-09

Family

ID=10690950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92301781A Withdrawn EP0502684A1 (de) 1991-03-04 1992-03-02 Verdrängungspumpe mit rotierendem Kolben

Country Status (3)

Country Link
EP (1) EP0502684A1 (de)
JP (1) JPH06101673A (de)
GB (1) GB9104514D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6443199B1 (en) 1997-09-17 2002-09-03 The Goodyear Tire & Rubber Company Footprints for nonrotatable automobile and light truck tires
GB2426036A (en) * 2005-05-10 2006-11-15 Bernard Whicher Vertical Northey compressor
CN105683578A (zh) * 2013-11-05 2016-06-15 阿耐思特岩田株式会社 爪式泵
CN113357146A (zh) * 2019-10-28 2021-09-07 奥利安机械股份有限公司 爪泵

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5205500A (en) * 1999-06-14 2001-01-02 Wei Xiong A gear and a fluid machine with a pair of gears
TW201135067A (en) * 2010-04-02 2011-10-16 yi-lin Zhu Air compression device
CN108050061B (zh) * 2018-01-09 2023-08-29 中国石油大学(华东) 一种高效爪式转子

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1102554A (fr) * 1954-04-07 1955-10-24 Surpresseur compresseur volumétrique
GB800211A (en) * 1955-09-01 1958-08-20 Clifford Edmund Brewer Improvements in or relating to rotary compressors, pumps or motors
US3723031A (en) * 1970-11-23 1973-03-27 A Brown Rotary displacement machines
US4324538A (en) * 1978-09-27 1982-04-13 Ingersoll-Rand Company Rotary positive displacement machine with specific lobed rotor profiles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1102554A (fr) * 1954-04-07 1955-10-24 Surpresseur compresseur volumétrique
GB800211A (en) * 1955-09-01 1958-08-20 Clifford Edmund Brewer Improvements in or relating to rotary compressors, pumps or motors
US3723031A (en) * 1970-11-23 1973-03-27 A Brown Rotary displacement machines
US4324538A (en) * 1978-09-27 1982-04-13 Ingersoll-Rand Company Rotary positive displacement machine with specific lobed rotor profiles

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6443199B1 (en) 1997-09-17 2002-09-03 The Goodyear Tire & Rubber Company Footprints for nonrotatable automobile and light truck tires
GB2426036A (en) * 2005-05-10 2006-11-15 Bernard Whicher Vertical Northey compressor
CN105683578A (zh) * 2013-11-05 2016-06-15 阿耐思特岩田株式会社 爪式泵
EP3067562A4 (de) * 2013-11-05 2017-06-28 Anest Iwata Corporation Klauenpumpe
CN105683578B (zh) * 2013-11-05 2017-08-08 阿耐思特岩田株式会社 爪式泵
US10012231B2 (en) 2013-11-05 2018-07-03 Anest Iwata Corporation Claw pump
CN113357146A (zh) * 2019-10-28 2021-09-07 奥利安机械股份有限公司 爪泵
CN113357146B (zh) * 2019-10-28 2023-02-03 奥利安机械股份有限公司 爪泵

Also Published As

Publication number Publication date
GB9104514D0 (en) 1991-04-17
JPH06101673A (ja) 1994-04-12

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