GB2554676A - Vane pump - Google Patents
Vane pump Download PDFInfo
- Publication number
- GB2554676A GB2554676A GB1616778.5A GB201616778A GB2554676A GB 2554676 A GB2554676 A GB 2554676A GB 201616778 A GB201616778 A GB 201616778A GB 2554676 A GB2554676 A GB 2554676A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- blade
- pump
- blades
- rotor
- 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- Withdrawn
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
- 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
-
- 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
- F01C21/0827—Vane tracking; control therefor by mechanical means
- F01C21/0845—Vane tracking; control therefor by mechanical means comprising elastic means, e.g. springs
-
- 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
-
- 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
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/203—Fuel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
A vane pump 12 having a rotor 20 with a plurality of slots 34 in the peripheral face 32. Blades 40 are slidably arranged in each slot and a spring 46 outwardly biasing them. The spring comprises an elastically bent portion 52 and a substantially straight portion 54. The bent portion being arranged away from the blade and the straight portion extends from the bent portion so that the blade is biased by it. The bent portion of the spring may have an axis X3 parallel to the main axis of the pump X1 and may be wound over forming a coil about the spring axis. The spring axis may be arranged between two blades, having two straight arms to bias both blades. Smooth shoes may be on the straight portion of the spring so that blade avoids direct contact with the spring. The spring may form a polygon, the number of sides matching the number of blades. The straight sides of the polygon act to bias the blades. The corners of the polygon may comprise a convolute which accommodates deformation of the spring. A fuel injection assembly utilising such a vane pump as a feed pump is also disclosed.
Description
(71) Applicant(s):
Delphi International Operations Luxembourg S.a.r.l. Avenue de Luxembourg, L-4940 Bascharage, Luxembourg (72) Inventor(s):
Diego Guerrato (74) Agent and/or Address for Service:
DELPHI FRANCE SAS
PO Box CS 65059, Bat. Le Raspail,
ZAC Paris Nord II 22, avenue des Nations,
Roissy CDG Cedex 95972,
France (including Overseas Departments and Territori es) (51) INT CL:
F04C 2/344 (2006.01) (56) Documents Cited:
CN 203175850 U DE 003939096 A1
DE 102013221701 A1 JP 600228785 A JP 2003301781 A (58) Field of Search:
INT CL F01C, F04C Other: EPODOC & WPI (54) Title of the Invention: Vane pump
Abstract Title: Vane pump with sprung blades (57) A vane pump 12 having a rotor 20 with a plurality of slots 34 in the peripheral face 32. Blades 40 are slidably arranged in each slot and a spring 46 outwardly biasing them. The spring comprises an elastically bent portion 52 and a substantially straight portion 54. The bent portion being arranged away from the blade and the straight portion extends from the bent portion so that the blade is biased by it.
The bent portion of the spring may have an axis X3 parallel to the main axis of the pump X1 and may be wound over forming a coil about the spring axis. The spring axis may be arranged between two blades, having two straight arms to bias both blades. Smooth shoes may be on the straight portion of the spring so that blade avoids direct contact with the spring.
FIG. 2 (continued on next page)
GB 2554676 A continuation (57) cont
The spring may form a polygon, the number of sides matching the number of blades. The straight sides of the polygon act to bias the blades. The corners of the polygon may comprise a convolute which accommodates deformation of the spring. A fuel injection assembly utilising such a vane pump as a feed pump is also disclosed.
/3
FIG.
x
2/3
FIG. 2
FIG. 3
3/3
FIG. 4
VANE PUMP
TECHNICAL FIELD
The present invention relates to a blade pump and more particularly to a spring arrangement for biasing blades.
BACKGROUND OF THE INVENTION
In a blade pump, blades radially sliding in the slots of a rotor move in and out of their slots as a function of the rotation of the rotor. A coil spring compressed in the bottom of each slot outwardly biases the blades so that, in use, the outer end slides against a liner. To ensure sealing across the blades and to accommodate the arrangement of the spring, the blades are designed larger, the outer ends of the blades are often provided with a double sliding lip and, an inner fluid communication channel is provided in the blade to enable fluid to flow toward said bottom of the slot, this in order to compensate for pressure drops and spikes when the blade moves. The dimensioning of the pump is therefore a compromise between the required fluid transfer capacity of the pump and, the required dimensions of the components, this constrains resulting in a pump larger than required.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing a blade pump having a housing comprising a peripheral liner defining an inner space in which a rotor is adapted to rotate about a main axis. The rotor has transverse lateral faces and a peripheral cylindrical face and, it is provided with a plurality of slots which open in said peripheral face. A blade is slidably arranged in each slot and, a spring outwardly biases said blade so that, the blade protrudes outside the slot and, the outer end of the blade slides against said liner of the housing. Thus are defined a plurality of arcuate chambers between the peripheral face of the rotor, the liner and the outer end of the blades, the volume of said chambers cyclically varying between large and small as the rotor rotates.
The spring comprises an elastically bent portion, that is an energy accumulator and, a substantially straight portion, that is an energy delivery member,, the bent portion, being arranged away from the blade and, the straight portion, extending from said bent portion to the blade so that the blade is biased by said straight portion.
Also, the bent portion is wound about a spring axis parallel to the main axis.
More precisely, the bent portion is wound over at least one turn forming a coil wound about said spring axis.
Also, the spring axis is arranged half way between two blades, the spring comprising two straight portions forming arms, each arm extending from an end of the coil toward one blade.
Also, in certain embodiments a shoe having a smooth outer shape, for instance oval or spherical, is arranged at the end of the arm so that said shoe transmits the force to the blade and avoids direct contact between the spring and the blade.
In a specific embodiment, the spring forms a polygon having same number of sides as there are blades on the rotor, said sides being flexible straight portions extending between bent comers that accommodate the flexible arms deformation of the spring. The spring is arranged on the rotor so that each bent corner is arranged half way between two blades, each side being flexed under a blade and biasing it toward the liner.
Also, the rotor is provided with a recess dug in a lateral face the spring being arranged in said recess.
The invention further extends to a fuel pump assembly adapted to be arranged in a fuel injection equipment, said fuel pump assembly comprising a feed pump for drawing fuel from a low pressure tank and for delivering it to a high pressure pump, said feed pump being a blade pump as presented above.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure lisa section of a diesel pump comprising a blade pump and a high pressure pump.
Figure 2 is a section transverse to a main axis XI of the blade pump of a first embodiment of figure 1.
Figure 3 is a magnified area of figure 2.
Figure 4 is a second embodiment of the blade pump of figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In an internal combustion engine provided with a direct fuel injection equipment, a pump assembly 10 represented on figure 1 is adapted to draw fuel from a low pressure tank, to pressurize and to deliver it to a high pressure reservoir from which said fuel is distributed to fuel injectors.
The fuel pump assembly 10, which in the example chosen is a diesel pump, comprises a transfer pump 12 and a high pressure pump 14, both pumps being fixed to a cambox 16. A camshaft 18 adapted to rotate in said cambox 16 imparts rotational movement to the transfer pump 12 and reciprocal linear movements to one, or more, piston of the high pressure pump 14.
The transfer pump 12 now described is a blade pump 12 described in reference to the figures 2 to 4.
The typical blade pump 12 has a housing with peripheral walls defining an inner space S in which a rotor 20 rotates about a main axis XI. The peripheral walls comprise an inner plate 22, also identified as distribution plate 22 transverse to said main axis XI, an outer plate 24 also transverse to said main axis XI and, a peripheral liner 26 that defines a cylindrical track.
The rotor 20 in a cylinder having a peripheral cylindrical face 32 axially extending between a first transverse lateral face 28 and an opposed second transverse lateral face 30. The rotor 20 is arranged in the housing so that said peripheral face 32 is distant from the liner 26.
The rotor 20 is provided with a plurality of slots 34 radially extending from an outer opening 36 opening in the peripheral face 32 to an inner end 38 closer to the axis XI. In each slot 34 is slidably arranged a blade 40 extending from an inner end 42 close to the inner end 38 of the slot, to an outer end 44 protruding from the slot through the outer opening 36 in the peripheral face of the rotor. Each blade 40 is outwardly biased so that the outer end 44 of the blade is in contact and is sliding, in use, against the liner 26 of the housing. The main axis XI and the liner axis X2 being parallel and offset, the arrangement of the rotor in the housing defines between the peripheral face 32 of the rotor, the liner 26 of the housing and the outer end 44 of the blades, a plurality of arcuate chambers C which, in use as the rotor rotates, volume cyclically varies between a large volume and small volume.
The blade pump 12 further comprises an inlet 48 and an outlet 50, both provided in the inner plate 22 of the housing, the inlet 48 opening in a first chamber Cl that volume increases and, the outlet 50 opening in a second chamber C2 which volume decreases. The offset between the main axis XI and the liner axis X2 is set so the top of the rotor 20 is almost tangent to the liner and so the chamber at the top has a volume almost null while the volume of the chamber at the bottom of the figure is maximum.
In a first embodiment of the blade pump 12 presented on figures 2 and 3, the four blades 40 are radially outwardly pushed by two springs 46, each spring 46 pushing two blades 40. More precisely the spring 46 is made of a string helically wound to form a torsional central coil 52, each of the two ends of the string forming arms 54 extending from said central coil 52 toward an extremity 56 that is in contact with the inner end 42 of the blade. The central portion 52 stores energy transmitted to the arms 54 and ultimately to the blades 40. To achieve said energy storage in the coil 52, the string is wound over at least one turn. Furthermore, to avoid direct contact between the string and the blade and generate undesired wear, an interface shoe 58 having an outer smooth shape, for instance oval or cylindrical, is arranged at the extremity 56 of the arm 54 in contact against the inner end 42 of the blade. An exemplary embodiment of such shoe 58 is presented on figure 3. The spring 46 is arranged on the rotor 20 in a V-shape recess 60 dug in one of the lateral faces 28, 30, said recess 60 having an outer wall provided with a comer 62 and two lateral extensions symmetrically extending toward the slots 34 wherein are the blades 40. The slots 34 open in said lateral extensions of the recess so that the inner ends 42 of the blades protrude in the recess. In such configuration, as shown on the figure, the spring 46 is forced in the recess 60, having the central coil portion 52 cornered in said comer 62 so that the central portion is rotationally compressed, or wound about a spring axis X3 parallel to the main axis XI and, the extremities 56 of the arms being forced under the blades.
Thanks to this string-made torsional spring, the thickness of the spring and the associated complementary depth of the recess 60 are reduced and, the blade 40 can be thinner than in the prior art, still keeping constant fluid capacity of the pump.
In a second embodiment of the blade pump 12 presented on figure 4, the spring 56 has been formed substantially into a square shape having four flexible sides 70 extending between four comers 72. Although the comers 72 could be bent to simple square angles, the embodiment presented shows a convolute 74 forming an inward loop to the spring arranged in each comer. Said convolutes 74 accommodate the deformation of the flexible sides. Similarly to the first embodiment, the spring 56 is arranged in a recess 76 that is here annular and provided in a lateral face 28, 30, of the rotor. Said annular recess 76 loops around the rotor axis XI and each of the slots 34 open in said recess 76, the inner ends 42 of the blades protruding in the recess 76. The sides 70 of the spring are inwardly flexed so that the inner end 42 of the blade contacts said sides 70 half way between two corners 72, said sides 70 outwardly biasing the blades onto the liner.
The pump 12 embodiment has four blades 40 but in alternatives said pump 12 could be provided with another number of blades. In such a case, the spring 56 would not be built square in shape but would form a closed polygon having as many comers 72 and sides 70 as there are blades in said pump. The arrangement would remain with one corner 72 half way between two blades.
LIST OF REFERENCES
XI main axis
X3 spring axis
S inner space
C chamber
Cl first chamber - inlet chamber
C2 second chamber - outlet chamber fuel pump assembly transfer pump - blade pump high pressure pump cambox camshaft rotor inner plate of the housing outer plate of the housing liner first face of the rotor second face of the rotor peripheral face of the rotor slot outer opening inner end blade inner end of the blade outer end of the blade spring inlet outlet central portion of the spring arms of the spring extremity of the arm shoe recess comer of the recess side of the spring - 2nd embodiment comer convolute annular recess
Claims (9)
1. Vane pump (12) having a housing comprising a peripheral liner (26) defining an inner space (S) in which a rotor (20) is adapted to rotate about a main axis (XI), the rotor (20) having transverse lateral faces (28) and a peripheral cylindrical face (32), the rotor (20) being provided with a plurality of slots (34) which open in said peripheral face (32), a blade (40) being slidably arranged in each slot (34) and, a spring (46) outwardly biasing said blade (40) so that, the blade protrudes outside the slot (34) and the outer end (44) of the blade slides against said liner (26) of the housing thus defining a plurality of arcuate chambers (C) between the peripheral face (32) of the rotor, the liner (26) and the outer end (44) of the blades, the volume of said chambers (C) cyclically varying between large and small as the rotor (20) rotates;
characterized in that the spring (46) comprises an elastically bent portion (52, 72) that is an energy accumulator and, a substantially straight portion (54, 70) that is an energy delivery member (54, 70), the bent portion (52, 72) being arranged away from the blade and, the straight portion (54, 70) extending from said bent portion to the blade (40) so that the blade (40) is biased by said straight portion (54, 70).
2. Vane pump (12) as claimed in the preceding claim wherein the bent portion (52, 72) is wound about a spring axis (X3) parallel to the main axis (XI).
3. Vane pump (12) as claimed in claim 2 wherein the bent portion (52, 72) is wound over at least one turn forming a coil wound about said spring axis (X3).
4. Vane pump (12) as claimed in claim 3 wherein the spring axis (X3) is arranged half way between two blades, the spring (46) comprising two straight portions forming arms (54), each arm (54) extending from an end of the coil (52) toward one blade (40).
5. Vane pump (12) as claimed in any one of the preceding claims wherein a shoe (58) having a smooth outer shape, for instance oval or cylindrical, is arranged at the end of the arm (54) so that said shoe (58) transmits the force to the blade and avoids direct contact between the spring and the blade.
6. Vane pump (12) as claimed in claim 1 wherein the spring (46) forms a 5 polygon having same number of sides (70) as there are blades (40) on the rotor, said sides (70) being flexible straight portions (70) extending between bent corners (72) that are the energy accumulators of the spring (46), the spring (46) being arranged on the rotor so that each bent comer (72) is arranged half way between two blades (40), each side (70) being flexed under a blade (40) and
10 biasing it toward the liner (26).
7. Vane pump (12) as claimed in claim 6 wherein the bent comers (72) comprise a loop forming a convolute (74) accomodating flexible deformation of the arms.
8. Vane pump (12) as claimed in any one of the preceding claims wherein the rotor is provided with a recess (60, 76) dug in a lateral face (28, 30), the spring (46) being arranged in said recess (60, 76).
20
9. Fuel pump assembly (10) adapted to be arranged in a fuel injection equipment, said fuel pump assembly (10) comprising a feed pump (12) for drawing fuel from a low pressure tank and for delivering it to a high pressure pump (14), said feed pump being a blade pump (12) as claimed in any one of the preceding claims.
Intellectual
Property
Office
Application No:
GB1616778.5
Examiner:
Nicholas Wigley
Claims searched:
1-9
Date of search:
12 January 2017
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1616778.5A GB2554676A (en) | 2016-10-03 | 2016-10-03 | Vane pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1616778.5A GB2554676A (en) | 2016-10-03 | 2016-10-03 | Vane pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201616778D0 GB201616778D0 (en) | 2016-11-16 |
| GB2554676A true GB2554676A (en) | 2018-04-11 |
Family
ID=57571082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1616778.5A Withdrawn GB2554676A (en) | 2016-10-03 | 2016-10-03 | Vane pump |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2554676A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60228785A (en) * | 1984-04-27 | 1985-11-14 | Mitsubishi Motors Corp | Vane pump |
| DE3939096A1 (en) * | 1989-11-25 | 1991-05-29 | Klaus Union Armaturen | Runner for use in pump or motor - has lamellae fitting into slots in rotor and pushed outward by star-shaped leaf spring assembly |
| JP2003301781A (en) * | 2002-04-10 | 2003-10-24 | Tokimec Inc | Vane pump and its modifying method |
| CN203175850U (en) * | 2013-02-05 | 2013-09-04 | 中国石油天然气股份有限公司 | Torsion Spring Vane Pump for Oil Well Lifting |
| DE102013221701A1 (en) * | 2013-10-25 | 2015-04-30 | Zf Lenksysteme Gmbh | WING CELL PUMP WITH FORCED WINGS |
-
2016
- 2016-10-03 GB GB1616778.5A patent/GB2554676A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60228785A (en) * | 1984-04-27 | 1985-11-14 | Mitsubishi Motors Corp | Vane pump |
| DE3939096A1 (en) * | 1989-11-25 | 1991-05-29 | Klaus Union Armaturen | Runner for use in pump or motor - has lamellae fitting into slots in rotor and pushed outward by star-shaped leaf spring assembly |
| JP2003301781A (en) * | 2002-04-10 | 2003-10-24 | Tokimec Inc | Vane pump and its modifying method |
| CN203175850U (en) * | 2013-02-05 | 2013-09-04 | 中国石油天然气股份有限公司 | Torsion Spring Vane Pump for Oil Well Lifting |
| DE102013221701A1 (en) * | 2013-10-25 | 2015-04-30 | Zf Lenksysteme Gmbh | WING CELL PUMP WITH FORCED WINGS |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201616778D0 (en) | 2016-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |