GB2571794A - Split blane vane pump - Google Patents

Split blane vane pump Download PDF

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Publication number
GB2571794A
GB2571794A GB1803861.2A GB201803861A GB2571794A GB 2571794 A GB2571794 A GB 2571794A GB 201803861 A GB201803861 A GB 201803861A GB 2571794 A GB2571794 A GB 2571794A
Authority
GB
United Kingdom
Prior art keywords
pair
blade halves
blade
fingers
vane pump
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Withdrawn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
GB1803861.2A
Other versions
GB201803861D0 (en
Inventor
Gordon Hall Keith
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.)
Bruntel Ltd
Original Assignee
Bruntel 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 Bruntel Ltd filed Critical Bruntel Ltd
Priority to GB1803861.2A priority Critical patent/GB2571794A/en
Publication of GB201803861D0 publication Critical patent/GB201803861D0/en
Publication of GB2571794A publication Critical patent/GB2571794A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • F01C21/0854—Vane tracking; control therefor by fluid means
    • F01C21/0863—Vane tracking; control therefor by fluid means the fluid being the 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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0881—Construction of vanes or vane holders the vanes consisting of two or more parts
    • 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
    • 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
    • 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
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface 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)
  • Rotary Pumps (AREA)

Abstract

A vane pump has a rotor 1 into which a plurality of split interlocking blades 8 – 11 inclusive may be located within slots 2 and 3. A housing or casing 6 has inlet ports 19 and outlet ports 20. An outlet tapping 21 allows a pressurized supply to pass through a passage 22 within an end cap 7 and may be directed to an axial feed drilling 23 located in the rotor 1. Pressure is then directed to the base of each blade half to bias or force it outwards along the rotor slot so the tip is contacting the inside of the casing. The blades may also be biased apart by springs. The blades may also tilt due to tapering of the finger thickness. The pump may have radial inlet and outlet ports. The applicant seeks to increase the efficiency of vane pumps by minimising the clearance between the blade tip and the casing/housing.

Description

1.
Split Blade Vane Pump
Background
Rotary vane pumps comprise a rotor with radial slots locating movable blades that follow the contour of an eccentric housing wall to create a change in chamber volume between adjacent blades. In one type of vane pump the slots are individual to each blade and a pocket is formed behind the blade in its radial displacement. One issue is that pump pressure on the blade tip may force the blade away from contact with the housing, thus creating leakage between adjacent volumes. Another issue is that a rapidly increasing pocket volume in the slot inboard of the blade decreases the pocket pressure, potentially causing cavitation.
Another vane pump type employs 2 orthogonal rotor slots that locate 2 fixed length blades to create 4 rotor segments. This eliminates the cavitation pocket but introduces clearance between blade tip and housing. Vane pumps and competitor rotary positive displacement pumps typically have a sufficiently large diameter to accommodate axial ports on one end face.
As frictional power losses broadly relate to LDA3 (L=length and D=diameter), simplifying to DA2 for a given capacity. Hence, a pump 3 times the diameter has 9 times the frictional power losses. Hence, it is attractive to reduce the diameter of a vane pump in order to minimise the frictional power losses. Axial ports no longer provide sufficient area in such low D/L vane pump geometries, making radial ports essential. The smaller diameter of such a radial ported vane pump also reduces leakage around the axial ends of the blades and facilitates higher operating speeds.
Ideally, the rotor blade diameter is constant at all rotor angles, ensuring a constant distance between each blade half. This results typically in an oval housing geometry with the minor diameter across the line of maximum rotor eccentricity.
The novel feature of the proposed vane pump is the pressurised feed along the rotor axis of a through slotted rotor design in combination with split blade halves. The axial rotor feed intersects the rotor slot(s) and the pressure forces each blade half against the housing wall, eliminating blade tip to housing clearance whilst providing self adjustment for blade tip wear. This self adjusting fully sealed blade tip feature ensures a much smoother delivery pressure at all rotor angles because outlet to inlet blade tip leakage flow is no longer influenced by the number of blades sealing between inlet and outlet sections.
Description
Figure 1 shows a 3 dimensional representation of a 4 segment radial ported rotary vane pump. 2 segment radial ported vane pump designs are also feasible with the addition of 1-way check valves to prevent backflow.
Rotor 1 comprises through slots 2,3 and bearing shafts 4,5 that are respectively located in housing 6 and end cap 7. Interlocking blades 8,9,10,11 are located in the
2.
rotor slots 2,3 and the assembly eccentrically located in the housing 6 and end cap 7. Blade fingers 12,13,14,15,16,17,18 help to react bending loads on the blades due to outlet pressure. Bearing shaft 4 is extended in order to mount a drive pulley or drive gear. Inlet port 19 feeds the pump chamber volumes defined between the housing, rotor and blades that on rotation then feed outlet port 20.
An outlet feed tapping 21 directs pressure via the end cap passage 22 and axial end clearance to the rotor axis drilling 23 into the rotor slots 2,3 in order to exert an outward radial force on each of the blades. Pump output pressure acts inwardly on the blade tip area, less the sealing contact area and the inlet pressure area. Hence, for like output pressures, the outward force due to the rotor axial pressure acting on the full width of the blade always exceeds the inward force and the blade tip remains in contact with the housing wall. Blade centrifugal force further increases blade tip contact load against the housing and spring loading between the blade halves (not shown) assists sealing in starting conditions before significant output pressure has been developed.
Output pressure also acts tangentially against the blade causing it to tilt within the constraints of the slot-blade clearance and interwoven blade fingers react this tilting moment. To seal the blade-rotor clearance along the inner full length section of the blade half a local raised surface may be employed or a surface treatment coating added. Another alternative is to taper the blade finger thickness, allowing increased tilt that reduces the clearance along the inner full length section of the blade.
Employing radial inlet and outlet ports means that the blades are unsupported when crossing each port. In order to minimise blade tip wear it is preferable to maximise the number of port walls supporting the blade by using multiple port apertures and avoiding rectangular shaped apertures involving abrupt loss of blade support.

Claims (15)

1. A vane pump comprising a slotted rotor supported eccentrically in a housing chamber and comprising an axial drilling aperture;
a pair of blade halves located in the slotted rotor and extending toward a chamber wall for dividing the chamber into radial segments;
an axial pressure feed arranged to direct pressure axially within the rotor; wherein the blade halves comprise an interlocking portion within the slotted rotor; and wherein the axial pressure feed is directed through the axial drilling aperture and arranged to intersect the blade halves for providing pressure to force each of the blade halves against the housing wall, along an outer length of each blade half.
2. A vane pump according to claim 1, further comprising a housing, the housing comprising a chamber having a wall, at least a radial inlet port and a radial outlet port, each of the ports having multiple apertures, an outlet feed tapping for e e e e providing a pressurised feed to the rotor, and an end cap comprising a passage • · · ’ * ’ arranged for cooperation with the outlet feed tapping for directing the pressurised • * feed along a longitudinal axis of the rotor.
;
3. A vane pump according to claim 2, wherein the radial inlet port and the radial • · · · outlet port are radially misaligned with respect to one another.
4. A vane pump according to any preceding claim, wherein the slotted rotor • · · · • · ·! comprises at least a pair of through slots arranged in a plane, each pair of slots • · ·
•. *. · arranged for accommodating the pair of interlocking blade halves, and wherein the axial drilling aperture is arranged along a longitudinal axis of the slotted rotor.
5. A vane pump according to any preceding claim wherein each of the pair of blade halves comprises an elongate portion with a tip for contacting a wall of a blade pump housing chamber along a length of each of the blade halves.
6. A vane pump according to any preceding claim wherein a first of the pair of blade halves comprises a finger arranged along a side of the elongate portion opposite the tip, and a second of the pair of blade halves comprises a pair of fingers arranged along a side of the elongate portion opposite the tip for interlocking with the finger of the first of the pair of blade halves to form the pair of blade halves.
i )
7. A vane pump according to claim 6, wherein the finger of the first of the pair of blade halves is arranged substantially centrally along the side of the elongate portion opposite the tip, and the pair of fingers of the second of the pair of blade halves is arranged along the side of the elongate portion opposite the tip such that the finger of the first of the pair of blade halves is arranged between the fingers of the pair of fingers of the second of the pair of blade halves to form a first interlock.
8. A vane pump according to any one of claims 4 to 7, wherein the slotted rotor comprises a second pair of through slots arranged in a second plane, radially offset from the first pair of through slots, and arranged to accommodate a second pair of blade halves.
9. A vane pump according to claim 8, further comprising a second pair of blade halves wherein a first of the second pair of blade halves comprises a pair of fingers arranged along an elongate portion at a side opposite a tip, and a second of the second pair of blade halves comprises a pair of fingers arranged along'an elongate portion at a side opposite a tip for interlocking with the pair of fingers of β φ e, a first of the second pair of blade halves to form the second pair of blade halves.
• · · * * *
10. A vane pump according to claim 9, wherein the pair of fingers of the first of the • * second pair of blade halves is arranged along the side of the elongate portion
Z . · ·. opposite the tip at a first end such that one of the pair of fingers is at a first end of the elongate portion, and another of the pair of fingers is at a second end of the elongate portion opposite the first, and the pair of fingers of the second of the pair • · · · • · · ί of blade halves is arranged along the side of the elongate portion opposite the tip
- · ·
*. ’ ·! such that one of the pair of fingers of the second of the pair of blade halves is adjacent the one of the pair of fingers of the first of the second pair of blade halves and another of the pair of fingers of the second of the pair of blade halves is adjacent the other of the pair of fingers of the first of the second pair of blade halves to form a second interlock.
11. A vane pump according to claim 10, wherein the first interlock fits occupies a space formed by the second interlock to form a third interlock between the pair of blade halves and the second pair of blade halves.
12. A vane pump according to claim 11, wherein the first, second, and third interlock is contained within the slotted rotor.
13. A vane pump according to any preceding claim, wherein the interlocking fingers of the pair of blade halves and/or the interlocking fingers of the second pair of blade halves taper in depth to accommodate blade tilt and reduce blade-rotor clearance along the tip of each of the blade halves.
14. A vane pump according to any preceding claim wherein each of the blade halves is arranged to form 2-sided contact to its respective through slot when tilted in order to seal the pressurised axial rotor feed from the inlet side of the pump.
15. A kit of parts consisting of a slotted rotor, at least a pair of blade halves, and an axial pressure feed as defined in the preceding claims.
GB1803861.2A 2018-03-09 2018-03-09 Split blane vane pump Withdrawn GB2571794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1803861.2A GB2571794A (en) 2018-03-09 2018-03-09 Split blane vane pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1803861.2A GB2571794A (en) 2018-03-09 2018-03-09 Split blane vane pump

Publications (2)

Publication Number Publication Date
GB201803861D0 GB201803861D0 (en) 2018-04-25
GB2571794A true GB2571794A (en) 2019-09-11

Family

ID=61972969

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1803861.2A Withdrawn GB2571794A (en) 2018-03-09 2018-03-09 Split blane vane pump

Country Status (1)

Country Link
GB (1) GB2571794A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02173375A (en) * 1988-12-23 1990-07-04 Kozaburo Nitta Rotary discharge pump
JPH04103892A (en) * 1990-08-21 1992-04-06 Kozaburo Nitta Rotary type fluid machine
US20020119065A1 (en) * 2001-02-23 2002-08-29 Sunil Palakodati Cartridge vane pump having enhanced cold start performance
US20180003176A1 (en) * 2016-06-30 2018-01-04 Schwäbische Hüttenwerke Automotive GmbH Vane cell pump with a sub-vane region to which pressure can be applied

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02173375A (en) * 1988-12-23 1990-07-04 Kozaburo Nitta Rotary discharge pump
JPH04103892A (en) * 1990-08-21 1992-04-06 Kozaburo Nitta Rotary type fluid machine
US20020119065A1 (en) * 2001-02-23 2002-08-29 Sunil Palakodati Cartridge vane pump having enhanced cold start performance
US20180003176A1 (en) * 2016-06-30 2018-01-04 Schwäbische Hüttenwerke Automotive GmbH Vane cell pump with a sub-vane region to which pressure can be applied

Also Published As

Publication number Publication date
GB201803861D0 (en) 2018-04-25

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