GB2364552A - Rotary positive displacement machine - Google Patents

Rotary positive displacement machine Download PDF

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Publication number
GB2364552A
GB2364552A GB0101960A GB0101960A GB2364552A GB 2364552 A GB2364552 A GB 2364552A GB 0101960 A GB0101960 A GB 0101960A GB 0101960 A GB0101960 A GB 0101960A GB 2364552 A GB2364552 A GB 2364552A
Authority
GB
United Kingdom
Prior art keywords
rotor
positive displacement
sealing member
rotary positive
displacement machine
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.)
Granted
Application number
GB0101960A
Other versions
GB2364552B (en
GB0101960D0 (en
Inventor
Ann Margaret Eley
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB0101960D0 publication Critical patent/GB0101960D0/en
Priority to AT01947673T priority Critical patent/ATE346238T1/en
Priority to MXPA03000345A priority patent/MXPA03000345A/en
Priority to PCT/GB2001/003089 priority patent/WO2002004814A2/en
Priority to EP01947673A priority patent/EP1366294B1/en
Priority to JP2002509652A priority patent/JP2004509258A/en
Priority to US10/332,382 priority patent/US6729864B2/en
Priority to AU2001269320A priority patent/AU2001269320A1/en
Priority to CNB018126499A priority patent/CN1193162C/en
Priority to DE60124775T priority patent/DE60124775T2/en
Publication of GB2364552A publication Critical patent/GB2364552A/en
Application granted granted Critical
Publication of GB2364552B publication Critical patent/GB2364552B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/32—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members
    • F04C18/322—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members with vanes hinged to the outer member and reciprocating with respect to the outer member
    • 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
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/30—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F01C1/40—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and having a hinged member
    • F01C1/46—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and having a hinged member with vanes hinged to the outer member
    • 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C18/3562—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
    • F04C18/3564—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution

Landscapes

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

Abstract

A stator 1 having a circular cylindrical internal surface 3 delimiting an operating chamber. A rotor 4 is mounted so as to be rotatable about the axis 8 of the internal surface 3 and has a cylindrical external surface 11, with one generatrix 13 adjacent to the internal surface 3, a diametrically opposite generatrix being spaced from the internal surface. A sealing member 17, projecting through a slot in the stator 1 into the operating chamber and being movable substantially radially, has an axial length substantially equal to that of the rotor 4. The sealing member 17 is connected to the rotor 4 by a linkage 19, 22 which causes the radially inner end of the sealing member to closely follow the external surface 3. A shutter disc 6 at one end of the rotor 4 covers a port 14, in particular an inlet port, in the stator 1. The disc 6 has a through-hole 23 with a first end 23a remote from the operating chamber and a second end 23b opening into the operating chamber, the first end periodically overlapping the port 14 as the rotor 4 rotates.

Description

I 1 2364552 Rotary Positive Displacement Machine The present invention
relates to rotary positive displacement machines, particularly, but not solely, for use in heat pumps.
In conventional small heat pumps no energy is recovered from vapour passing from the condenser to the evaporator.
It would be desirable to be able to recover energy from fluid between the condenser and the evaporator in a heat pump cycle.
It would also be desirable to provide a machine which allows vapour from the condenser to do work as it expands.
It would also be desirable to provide a machine for performing both compression and expansion.
The invention is based on a rotary positive displacement machine comprising:
a stator having a circular cylindrical internal surface delimiting an operating chamber, the stator having fluid inlet/outlet ports; a rotor in the operating chamber, the rotor being mounted so as to be rotatable relative to the stator about the axis of the said internal surface, the rotor having a cylindrical external surface, the said axis passing through the rotor, a generatrix of the external surface being adjacent to the said internal surface, and a diametrically opposite generatrix being spaced from the said internal surface; a sealing member projecting substantially radially through a slot in the stator into the operating chamber and being movable substantially radially, the sealing member extending parallel to the said axis and having a length substantially equal to that of the rotor; and means for keeping the radially inner end of the sealing member adjacent the external surface of the rotor.
In one aspect the invention provides a rotary positive displacement machine a set forth in claim 1.
In another aspect the invention provides a rotary positive displacement machine as set forth in claim 11.
The invention will be described further, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic end view of a rotary positive displacement machine, functioning as an expander, certain parts being omitted for the sake of clarity.
Figure 2 is a perspective view of a rotor, a sealing member, and associated parts of the machine; Figure 3 is a perspective view of the peripheral wall of a stator of the machine; Figure 4 is a perspective view of the rotor and associated parts; Figure 5 is a section taken on line V-V in Figure 4.
The rotary positive displacement machine illustrated has a stator or casing 1 with a peripheral wall 2 having a circular cylindrical internal surface 3. A rotor 4 arranged in the stator 1 is provided at each end with a shutter in the form of a flange or disc 6, having a circular cylindrical periphery 7 with only a small clearance between itself and the internal surface 3. The discs 6 together with the portion of the internal surface 3 extending between them delimit a circular cylindrical operating chamber in which the rotor 4 can orbit about the axis 8 of the internal surface 3. The rotor 4 is provided with trunnions 9 mounted in bearings (not shown) provided on the ends of the stator 1.
The rotor 4 has a circular cylindrical external surface 11 with an axis 12 which is eccentric with respect to the axis 8 of the internal surface 3 of the stator 1. The axis 8 passes through the rotor 4. One generatrix 13 of the external surface 11 (in a plane containing the axes 8, 12) is adjacent to the internal surface 3, with only a small clearance. The diametrically opposite generatrix is spaced from the internal surface 3.
In the region of each disc 6 and at the same circumferential location, the stator 1 has an inlet port 14 in the form of a slot extending along a circumferential arc. In the region of the operating chamber at a circumferential location spaced from the inlet ports 14, the stator 1 has an outlet port 16 in the form of an axial slot. Between the ports 14 and 16, and close to them, is a sealing member 17 which projects radically through a slot 18 in the stator 1 so as to be movable in the radial direction with respect to the axis 8. The sealing member 17 extends parallel to the axis 8 and has a length substantially equal to that of the rotor 4, with only a small clearance between the ends of the sealing member 17 and the discs 6.
In order to keep the radially inner end of the sealing member 17 adjacent to the external surface 11 of the rotor 4, without excessive friction, a link 19 (functioning as a connecting rod) has one end articulated to a pin 21 forming an extension of the rotor 4 on a first articulation axis coincident with the axis 12 and has the other end articulated to a parallel pin 22 mounted on one end of the sealing member 17 and defining a second articulation axis parallel to the first. In conjunction with the radially guiding of the sealing member 17 by the walls of the slot 18, this linkage (19, 21, 22) causes the inner end of the sealing member 17 to closely follow the external surface 11 of the rotor 4 as it rotates about the axis 8. For balanced operation, a similar linkage may be provided on the opposite end of the machine.
Each disc 6 has an inlet through-hole 23 with a first end 23a in the periphery 7 and a second end 23b opening into the operating chamber. Thus, the inlet port 14 only communicates with the operating chamber when the first end 23a overlaps the inlet port 14; otherwise the inlet port 14 is blanked off by the disc 6.
The above-described machine can be arranged as an expander in a heat pump (not shown) comprising a compressor, a condenser, an expander, and an evaporator, connected in series. Return vapour from the condenser is fed to the input ports 14. The circumferential length of the slots constituting the ports 14 is chosen to suit the length of time needed for the through-holes 23 to pass a required volume of vapour. Referring to Figure 1, the pressure of the vapour from the through-hole 23, acting on the rotor 4 between the sealing device 17 and the generatrix 13, urges the rotor 4 to turn in the direction of the arrow 24, while the vapour expands as the rotor rotates through nearly 360'. At the same time, previously expanded vapour is driven out through the outlet port 16.
It will be appreciated that the machine may be used as a compressor. Furthermore, the machine can operate on fluids other than refrigerants, e. g. vapours and gases, in particular air.
A combined compressor and expander may comprise two stators fixed end-toend and having a common axis, and two rotors operatively connected to rotate in synchronism.
The skilled reader will appreciate that various modifications may be made within the scope of the invention. For instance, one of the discs may be omitted and the end of the stator closed off by a fixed wall delimiting one end of the operating chamber. The sealing device may be urged into contact with the rotor by a spring device, instead of using the linkage. The rotor could be of any suitable cylindrical shape. An outlet port may be opened and closed by a through-hole in one of the discs in a similar way to the inlet port.

Claims (17)

CLAIMS:
1. A rotary positive displacement machine comprising: a stator having a circular cylindrical internal surface delimiting an operating chamber, the stator having fluid inlet/outlet ports; a rotor in the operating chamber, the rotor being mounted so as to be rotatable relative to the stator about the axis of the said internal surface, the rotor having a cylindrical external surface, the said axis passing through the rotor, a generatrix of the external surface being adjacent to the said internal, surface, and a diametrically opposite generatrix being spaced from the said internal surface; a sealing member projecting substantially radially through a slot in the stator into the operating chamber and being movable substantially radially, the sealing member extending parallel to the said axis and having a length substantially equal to that of the rotor; means for keeping the radially inner end of the sealing member adjacent the external surface of the rotor; and a shutter at one end of the rotor, the shutter rotating with the rotor and covering one of the said ports, the shutter having a through-hole with a first end remote from the operating chamber and a second end opening into the operating chamber, the first end periodically overlapping the said one port as the rotor rotates relative to the stator.
2. A rotary positive displacement machine as claimed in claim 1, in which the external surface of the rotor is circular cylindrical.
3. A rotary positive displacement machine as claim in claim 2, in which the sealing member is connected to the rotor by a linkage which causes the radially inner end of the sealing member to closely follow the said external surface.
6
4. A rotary positive displacement machine as claimed in claim 3, in which the linkage comprises a link having one end articulated to an extension of the rotor on a first articulation axis coincident with the axis of the said external surface and the other end articulated to the sealing member on a second articulation axis parallel to the first.
5. A rotary positive displacement machine as claimed in any preceding claim, in which the shutter is in the form of a disc.
6. A rotary positive displacement machine as claimed in claim 5, in which the first end of the through-hole is in the periphery of the disc.
7. A rotary positive displacement machine as claimed in any preceding claim, in which the said one port is in the form of a slot extending along a circumferential arc relative to the axis of the said internal surface.
8. A rotary positive displacement machine as claimed in any preceding claim, in which there is a shutter on each end of the rotor.
9. A rotary positive displacement machine as claimed in any preceding claim, in which another of the said ports is in permanent communication with the operating chamber.
10. A rotary positive displacement machine as claimed in any preceding claim, in which the inlet/outlet ports are adjacent the sealing member.
7
11. A rotary positive displacement machine comprising: a stator having a circular cylindrical internal surface delimiting an operating chamber, the stator having fluid/outlet ports; a rotor in the operating chamber, the rotor being mounted so as to be rotatable relative to the stator about the axis of the said internal surface, the rotor having a circular cylindrical external surface, the said axis passing through the rotor, a generatrix of the external surface being adjacent to the said internal surface, and a diametrically opposite generatrix being spaced from the said internal surface; a sealing member projecting substantially radially through a slot in the stator into the operating chamber and being movable substantially radially, the sealing member extending parallel to the said axis and having a length substantially equal to that of the rotor; and a linkage which connects the sealing member to the rotor and causes the radially inner end of the sealing member to closely follow the said external surface.
12. A heat pump comprising a compressor, a condenser, an expander, and an evaporator, connected in series, in which the expander comprises a rotary positive displacement machine according to any of claims 1 to 11.
13. A heat pump comprising a compressor, a condenser, an expander, and an evaporator, connected in series, in which the compressor comprises a rotary positive displacement machine according to any of claims 1 to 11.
14. A combined compressor and expander, comprising respective rotary positive displacements machines according to any of claims 1 to 11, the stators of the two machines being fixed end-to-end and having a common axis, and the rotors of the two machines being operatively connected to rotate in synchronism.
15. A rotary positive displacement machine substantially as described with reference to the accompanying drawings.
16. A heat pump substantially as described with reference to the accompanying drawings.
17. A combined compressor and expander substantially as described with reference to the accompanying drawings.
GB0101960A 2000-07-10 2001-01-25 Rotary positive displacement machine Expired - Lifetime GB2364552B (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU2001269320A AU2001269320A1 (en) 2000-07-10 2001-07-09 Rotary positive displacement machine
CNB018126499A CN1193162C (en) 2000-07-10 2001-07-09 Rotary positive displacement machine
PCT/GB2001/003089 WO2002004814A2 (en) 2000-07-10 2001-07-09 Rotary positive displacement machine
EP01947673A EP1366294B1 (en) 2000-07-10 2001-07-09 Rotary positive displacement machine
JP2002509652A JP2004509258A (en) 2000-07-10 2001-07-09 Rotary displacement machine
US10/332,382 US6729864B2 (en) 2000-07-10 2001-07-09 Rotary positive displacement machine
AT01947673T ATE346238T1 (en) 2000-07-10 2001-07-09 ROTARY PISTON FLUID DISPLACEMENT MACHINE
MXPA03000345A MXPA03000345A (en) 2000-07-10 2001-07-09 Rotary positive displacement machine.
DE60124775T DE60124775T2 (en) 2000-07-10 2001-07-09 ROTARY PISTON FLUID DISPLACEMENT MACHINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0016761A GB0016761D0 (en) 2000-07-10 2000-07-10 Energy recovery from compressed air or vapour

Publications (3)

Publication Number Publication Date
GB0101960D0 GB0101960D0 (en) 2001-03-14
GB2364552A true GB2364552A (en) 2002-01-30
GB2364552B GB2364552B (en) 2002-08-14

Family

ID=9895256

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0016761A Ceased GB0016761D0 (en) 2000-07-10 2000-07-10 Energy recovery from compressed air or vapour
GB0101960A Expired - Lifetime GB2364552B (en) 2000-07-10 2001-01-25 Rotary positive displacement machine

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0016761A Ceased GB0016761D0 (en) 2000-07-10 2000-07-10 Energy recovery from compressed air or vapour

Country Status (3)

Country Link
AU (1) AU2001269322A1 (en)
GB (2) GB0016761D0 (en)
WO (1) WO2002004787A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006502347A (en) * 2002-10-02 2006-01-19 イーエイ・テクニカル・サービシーズ・リミテッド Rotary positive displacement device with swivel piston
GB0222770D0 (en) * 2002-10-02 2002-11-06 E D Technical Services Ltd Air cycle heating and cooling
GB0413442D0 (en) 2004-06-16 2004-07-21 Ea Technical Services Ltd Rolling piston stirling engine
KR101870179B1 (en) * 2012-01-04 2018-06-22 엘지전자 주식회사 Rotary compressor with dual eccentric portion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB381886A (en) * 1931-05-11 1932-10-13 Sulzer Ag Improvements in or relating to rotary piston engines
GB382567A (en) * 1931-05-11 1932-10-27 Sulzer Ag Improvements in or relating to rotary piston engines
GB390443A (en) * 1931-10-19 1933-04-06 Eugen Ketterer Improvements in and relating to tightening means for the compression and suction chambers of rotary piston engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB381886A (en) * 1931-05-11 1932-10-13 Sulzer Ag Improvements in or relating to rotary piston engines
GB382567A (en) * 1931-05-11 1932-10-27 Sulzer Ag Improvements in or relating to rotary piston engines
GB390443A (en) * 1931-10-19 1933-04-06 Eugen Ketterer Improvements in and relating to tightening means for the compression and suction chambers of rotary piston engines

Also Published As

Publication number Publication date
GB2364552B (en) 2002-08-14
WO2002004787A2 (en) 2002-01-17
AU2001269322A1 (en) 2002-01-21
GB0101960D0 (en) 2001-03-14
GB0016761D0 (en) 2000-08-30

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
S73 Revocation on comptroller's initiative (section 73/patents act 1977)

Free format text: PATENT REVOKED; PATENT REVOKED UNDER SECTION 73(2) ON 27 JUNE 2011