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GB2394005A - Rotary sliding vane compressor - Google Patents

Rotary sliding vane compressor Download PDF

Info

Publication number
GB2394005A
GB2394005A GB0223530A GB0223530A GB2394005A GB 2394005 A GB2394005 A GB 2394005A GB 0223530 A GB0223530 A GB 0223530A GB 0223530 A GB0223530 A GB 0223530A GB 2394005 A GB2394005 A GB 2394005A
Authority
GB
United Kingdom
Prior art keywords
groove
sliding vane
rotary sliding
radius
vane compressor
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Withdrawn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
GB0223530A
Other versions
GB0223530D0 (en
Inventor
Edward Boller
Jon Morrison
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.)
Compair UK Ltd
Original Assignee
Compair UK 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 Compair UK Ltd filed Critical Compair UK Ltd
Priority to GB0223530A priority Critical patent/GB2394005A/en
Publication of GB0223530D0 publication Critical patent/GB0223530D0/en
Priority to PCT/GB2003/004354 priority patent/WO2004033914A1/en
Priority to AU2003300505A priority patent/AU2003300505A1/en
Publication of GB2394005A publication Critical patent/GB2394005A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08Rotary pistons
    • F01C21/0809Construction of vanes or vane holders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08Rotary pistons

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

A rotary sliding vane compressor having a cylindrical rotor 21 with a plurality of radially extending grooves 22, each defined by a radially inner groove bottom 25 and first 24 and second 23 parallel groove walls wherein at least the first groove wall is joined to the groove bottom by a first radius portion 29. The second groove wall may be joined to the groove bottom by a chamfered portion 28 or a second radius portion. The vanes may have a similar shape profile to that of the groove.

Description

ROTARY SLIDING VANE COMPRESSOR (1)
The present invention relates to a positive displacement rotary gas, e.g. air, compressor of the eccentric rotor sliding vane type and particularly, but not exclusively, to a compressor wherein the rotor is mounted on an extended shaft of an electric motor.
Shown in Figure 1 is a diagrammatic illustration of a conventional rotary vane compressor comprising a cylindrical rotor (1) driven by an electric motor (not shown) and mounted eccentrically within the cylindrical bore of a stator (2).
Formed in the rotor (1) is a plurality of radially extending grooves or slots (9) each of which accommodates a freely slideable blade or vane (5). During rotation R of the rotor by the electric motor each vane (5) is thrown outwards by centrifugal force so that its outer edge sweeps the internal cylindrical surface of the stator (2). The free space between adjacent vanes is thus divided into closed cells (7,8). Air or other gas taken in at inlet (1) through port (3) is thus compressed as the free space in each cell diminishes as the rotor turns and the compressed air is output at (O) via outlet port (4). The compressor further comprises oil injection means via inlet (6) to provide lubrication and sealing between the outer edges of the vanes and the inner surface of the stator.
Accordingly in operation of a rotary vane compressor the closed cells to either side of any particular vane are at significantly different pressures as the vane passes from the inlet port to the outlet port. In Figure 1, for example, the closed cell 8 is at a significantly higher pressure than the adjacent closed cell 7.
This pressure differential acting on the interposed vane 10 produces a resultant force which has damaging implications for both the vane itself and the groove, and particularly stress damage to the interior portion of the rotor in the region of the radially inner end of each groove.
The likelihood of stress related damage resulting from the differential pressure acting on the vane is increased in the case of a compressor in which the rotor has a central bore by which it is mounted on the extended shaft of the driving electric motor, in contrast to a conventional rotor having a solid centre.
This increased risk arises because of the presence of the central bore through the longitudinal axis of the cylindrical rotor said bore being in relatively close proximity to the radially inner bases of the grooves.
It is an object of the present invention to eliminate or at least mitigate possible stress related damage in the region of the radially inner groove ends of the rotor of an eccentric rotor sliding vane compressor.
According to one aspect of the present invention a rotary sliding vane compressor comprises a cylindrical rotor provided with a plurality of radially extending grooves each defined by a radially inner most groove bottom and two parallel groove walls extending outwardly therefrom wherein at least one of the groove walls is joined to the groove bottom by a radius portion.
In another of its aspects the present invention teaches that the groove comprises a pair of planar confronting surfaces one of which extends further radially inwards than the other.
Preferably the radius portion is associated with the groove wall on the low pressure side of the blade or vane, i.e. associated with the trailing groove wall in the direction of rotation of the rotor.
The groove side wall opposite said at least one of the groove walls may also be joined to the groove bottom by a chamfered portion or by a radius portion. Where both portions are radius portions preferably the radius portion joining the groove side wall on the low pressure side preferably has a greater radius of curvature than that of the radius portion on the other side. More preferably the radius of curvature of the portion on the high pressure side is
between 0.5 and 1.0 mm and the radius of curvature of the portion on the low pressure side is equal to the width of the groove less the radius of curvature of the portion on the high pressure side.
The bottom portion, i.e. the radially innermost portion, of the compressor blade or vane may also have a similar or identical shape profile to that of the radially inner part of the groove so that the bottom of the blade is able to sit fully in the groove bottom.
Further aspects of the present invention will become apparent from the following description given, by way of example only, of an embodiment of the
invention in conjunction with the following diagrams in which: Figure 2 shows a schematic diagram of a cross section of a rotor of a compressor in accordance with the present invention, the cross section being taken perpendicularly to the rotational axis of the rotor; and Figure 3 shows in more detail the radially inner end of one of the grooves in the rotor in Figure 2; and Figure 4 a diagrammatic cross section of a vane or blade of a compressor of the present invention; and Figure 5 show further detail of the radially inward end of the blade of Figure 4.
The rotor 21 of the compressor of the present invention shown in Figure 2 has six equal sized and equi-spaced apart grooves 22 extending radially outwards from a groove bottom 25 to the cylindrical outer peripheral surface 27 of the rotor. Each of the grooves 22 is defined by two parallel groove walls 23, 24, groove wall 23 being the leading groove wall when the rotor turns around rotational axis C in the direction R as indicated. Accordingly the opposing groove wall 24 is the trailing groove wall. In the centre of the rotor 21 is a longitudinally
) 4 extending circular hole 26 enabling the rotor 21 to be mounted on the extended shaft of an electric motor (not shown).
As shown in Figure 3 the junction of the trailing groove wall 24 with the groove bottom 25 is radiused to the extent that the concavely curved portion 29 extends beyond the centre line of the groove, i.e. beyond 50 percent of the width W of the groove. In accordance with the preferred aspect of the invention the radius of curvature RADG of the curved portion is between 50 percent and 90 percent of the width W of the groove. In this particular embodiment the value of red is 76 percent of the width W. As also shown in Figure 3 the portion 28 at the junction of the leading groove wall 23 with the groove base 25 is chamfered. In this particular embodiment the portion 28 is chamfered at an angle of 45 degrees but it may be of radiused with a radius of curvature preferably between 0.5 and 1.0 mm.
The curved portion 29 in a preferred configuration has a radius of curvature RADG equal to the groove width W minus the radius of curvature of the portion 28 if portion 28 is curved, not chamfered with the centres of curvature positioned such that the curved portions 28,29 are tangential with their respective groove walls 24,23.
In this particular embodiment the radial length L of the groove is substantially three times as great as the distance D between the groove bottom 25 and the central hole 26. In accordance with the preferred aspects of the present invention the radius of curvature RADG of the curved portion 29 is between 20 and 30 percent of the distance D between the grooved bottom 25 and the central hole 26.
Shown in Figure 4 is a cross section of a blade or vane 30 of the present invention for use in conjunction with the rotor 21. In operation of the compressor the blade 30 is positioned within groove 22 such that the blade side
i 31 is the leading side whereas the opposite side 32 is the trailing side. Further details of the radially inner end of the blade 30 are shown in Figure 5 where it can be seen that the portion 34 at the junction of the trailing blade side 32 and the blade bottom 33 is convexly curved in a matching form to the concavely formed portion 29 adjacent groove bottom. Similarly the junction portion 35 between the leading blade side 31 and the blade bottom 33 is chamfered to conform with the chamfered portion 28 of the groove.
It will also be seen from Figures 4 and 5 that the side surfaces 31, 32 are each substantially planar and that one surface 31, when in situ, extends further radially inwards than the other side surface 32.
In a preferred embodiment of the present invention the configuration of the radially inner end of the blade is substantially identical to the radially inner end of the groove with the radius of curvature RADB of the curved portion 34 being the same as the radius RADG of the groove portion 29.
Such preferred embodiment may also have one or more shallow grooves formed on one side of the blade, these grooves extending radially outwardly from the radially inner blade bottom end to the radially outer blade top end in order to relieve pressure at the inner end of the blade. Preferably the groove or grooves are formed on one side only of the blade, and more preferably on the same side on each of the blades such that may provide a visual aid in the correct assembling of the blades in the rotor. Most preferably the groove or grooves are formed in the trailing side of the blade.

Claims (12)

1. A rotary sliding vane compressor comprising a cylindrical rotor provided with a plurality of radially extending grooves each defined by a radially inner most groove bottom and first and second parallel groove walls extending outwardly therefrom wherein at least the first groove wall is joined to the groove bottom by a first radius portion.
2. A rotary sliding vane compressor in accordance with claim 1, wherein the first groove wall is the trailing groove wall in the direction of rotation of the rotor such that the first radius portion associated with said first groove wall is on the low pressure side of the sliding vane.
3. A rotary sliding vane compressor In accordance with either of claims 1 and 2, wherein the second groove side wall is joined to the groove bottom by a chamfered portion.
4. A rotary sliding vane compressor in accordance with either of claims 1 and 2, wherein the second groove side wall is joined to the groove bottom by a second radius portion.
5. A rotary sliding vane compressor in accordance with claim 4, wherein the first radius portion has a greater radius of curvature than that of the second radius portion.
6. A rotary sliding vane compressor in accordance with either of claims 4 and 5, wherein the second radius portion has a radius of curvature in the range of 0.5 and 1.0 mm.
7. A rotary sliding vane compressor in accordance with any of claims 4 to 6, wherein the radius of curvature of the first radius portion is equal to the width of the groove minus the radius of curvature of the second radius portion which is the radius portion on the high pressure side of the vane or blade.
8. A rotary sliding vane compressor in accordance with any of claims 1 to 7, wherein the radially innermost portion of a vane which slides within a groove has a substantially similar shape profile to that of the radially inner part of the groove such that the bottom of the vane is able to sit fully in the groove bottom.
9. A rotary sliding vane compressor comprising a cylindrical rotor provided with a plurality of radially extending grooves wherein each groove comprises a pair of planar confronting surfaces one of which is extends further radially inwardly than the other.
10. A rotary sliding vane compressor in accordance claim 9, wherein in use of the compressor the planar confronting surface of greatest radial extent is the leading surface of the pair in the direction of rotation of the rotor such that it is on the side of higher pressure.
11. A rotary sliding vane compressor in accordance with any one of the preceding claims wherein the rotor has a central bore.
12. A rotary sliding vane compressor as herein described and depicted In Figures 1 to 5.
GB0223530A 2002-10-10 2002-10-10 Rotary sliding vane compressor Withdrawn GB2394005A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0223530A GB2394005A (en) 2002-10-10 2002-10-10 Rotary sliding vane compressor
PCT/GB2003/004354 WO2004033914A1 (en) 2002-10-10 2003-10-08 Rotary sliding vane compressor
AU2003300505A AU2003300505A1 (en) 2002-10-10 2003-10-08 Rotary sliding vane compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0223530A GB2394005A (en) 2002-10-10 2002-10-10 Rotary sliding vane compressor

Publications (2)

Publication Number Publication Date
GB0223530D0 GB0223530D0 (en) 2002-11-13
GB2394005A true GB2394005A (en) 2004-04-14

Family

ID=9945639

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0223530A Withdrawn GB2394005A (en) 2002-10-10 2002-10-10 Rotary sliding vane compressor

Country Status (3)

Country Link
AU (1) AU2003300505A1 (en)
GB (1) GB2394005A (en)
WO (1) WO2004033914A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821711A (en) * 2012-11-19 2014-05-28 六汉企业股份有限公司 Pump structure

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565447A (en) * 1943-09-23 1944-11-10 Arthur Cyril Thornton Improvements in or relating to engine driven rotary air compressors for aero engines
US3873253A (en) * 1971-10-11 1975-03-25 Karl Eickmann Vane seal means in rotary vane machines
US4392795A (en) * 1981-01-30 1983-07-12 Rexnord Inc. Wear resistant rotor slots for vane-type pumps or motors
US4551896A (en) * 1983-07-16 1985-11-12 Nippon Piston Ring Co., Ltd. Method of manufacturing a rotor for a rotary fluid pump
US4649612A (en) * 1984-12-26 1987-03-17 Nippon Piston Ring Co., Ltd. Method of manufacturing a rotor for rotary fluid pumps
US4662046A (en) * 1981-06-22 1987-05-05 Vickers, Incorporated Power transmission
US4804317A (en) * 1987-03-13 1989-02-14 Eaton Corporation Rotary vane pump with floating rotor side plates
WO1996000852A1 (en) * 1994-06-28 1996-01-11 Edwards Thomas C Non-contact vane-type fluid displacement machine with lubricant separator and sump arrangement
US6398528B1 (en) * 1999-08-13 2002-06-04 Argo-Tech Corporation Dual lobe, split ring, variable roller vane pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869231A (en) * 1973-10-03 1975-03-04 Abex Corp Vane type fluid energy translating device
JPS58206896A (en) * 1982-05-28 1983-12-02 Toyoda Mach Works Ltd Manufacture of vane
JPH0318683A (en) * 1989-06-15 1991-01-28 Zexel Corp Manufacturing of vane
DE4332540A1 (en) * 1993-09-24 1995-03-30 Bosch Gmbh Robert Vane pump
JPH08177767A (en) * 1994-12-20 1996-07-12 Zexel Corp Vane of vane type compressor and its manufacture

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565447A (en) * 1943-09-23 1944-11-10 Arthur Cyril Thornton Improvements in or relating to engine driven rotary air compressors for aero engines
US3873253A (en) * 1971-10-11 1975-03-25 Karl Eickmann Vane seal means in rotary vane machines
US4392795A (en) * 1981-01-30 1983-07-12 Rexnord Inc. Wear resistant rotor slots for vane-type pumps or motors
US4662046A (en) * 1981-06-22 1987-05-05 Vickers, Incorporated Power transmission
US4551896A (en) * 1983-07-16 1985-11-12 Nippon Piston Ring Co., Ltd. Method of manufacturing a rotor for a rotary fluid pump
US4649612A (en) * 1984-12-26 1987-03-17 Nippon Piston Ring Co., Ltd. Method of manufacturing a rotor for rotary fluid pumps
US4804317A (en) * 1987-03-13 1989-02-14 Eaton Corporation Rotary vane pump with floating rotor side plates
WO1996000852A1 (en) * 1994-06-28 1996-01-11 Edwards Thomas C Non-contact vane-type fluid displacement machine with lubricant separator and sump arrangement
US6398528B1 (en) * 1999-08-13 2002-06-04 Argo-Tech Corporation Dual lobe, split ring, variable roller vane pump

Also Published As

Publication number Publication date
GB0223530D0 (en) 2002-11-13
AU2003300505A1 (en) 2004-05-04
WO2004033914A1 (en) 2004-04-22

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)