EP0159968A2 - Pneumatic vane pump with body of stamped sheet-metal - Google Patents
Pneumatic vane pump with body of stamped sheet-metal Download PDFInfo
- Publication number
- EP0159968A2 EP0159968A2 EP85830096A EP85830096A EP0159968A2 EP 0159968 A2 EP0159968 A2 EP 0159968A2 EP 85830096 A EP85830096 A EP 85830096A EP 85830096 A EP85830096 A EP 85830096A EP 0159968 A2 EP0159968 A2 EP 0159968A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- vane pump
- support
- pump according
- pneumatic vane
- 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- Withdrawn
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Images
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
- F04C18/34—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
- F04C18/344—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 inner member
- F04C18/3441—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 inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F04C18/3442—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 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 inlet and outlet opening
-
- 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
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
Definitions
- the present invention relates to a pneumatic vane pump of the type comprising:
- Pumps of this type are commonly used on diesel engines for motor vehicles to create the low pressure needed to work vacuum-operated users including, for example, the servobrakes.
- such pumps have a cast outer casing closed by a cover which may also be cast or formed from sheet metal of sufficient thickness.
- the object of the present invention is to find a type of construction which simplifies the working with less complicated equipment, shorter times, and lower overall costs.
- the outer casing of the pump is constituted by (a) a cylinder of drawn sheet metal closed at one end by a base formed directly by the drawing of the cylinder itself, and (b) a support fixed to the motor and carrying the seat for rotation of the spindle of the rotor, a main flange which closes the cylinder and against which an end face of the rotor slides, the outlet ducts and openings for the air and the lubricating oil for the pump, and a second flange against which the stamped sheet metal cylinder bears and to which it is fixed.
- the outer casing of the pump is constituted by a support 1 and a cylinder 2 having a base 3.
- the support 1 carries a seat 4 for rotation of the spindle 5 of the rotor 6, as well as outlet ducts 7 and 8 for the air and lubricating oil.
- the cylinder is fixed to the support by screws 9 and a rubber ring 10 ensures sealing from the exterior.
- the vanes 11 are housed in grooves 12 in the rotor and slide against the iner surface 13 of the cylinder 2, against the flange 14 of the support and against the inner face 15 of the base 3. As shown in Figure 1, the air inlet slot 16 and union 17 are formed in the base 3.
- Figure 2 illustrates another arrangement of the air inlet opening and union, in which the support 1 includes an air inlet duct 16a and a seat 17a for an air inlet union 28.
- the union 28 incorporates a non-return valve constituted by a sleeve 29, preferably of plastics material, having an outer end 30 for attachment of the air inlet pipes and an inner portion 31 provided at its end with an apertured flange on which a rubber washer 32 bears.
- the washer 32 urged by the pressure difference existing between its two faces, prevents air from returning towards the inlet when the pressure of the air drawn in is less than that of the air in the pump.
- Figure 3 shows just such a rotor with five vanes.
- Figure 5 illustrates a device which may be used to simplify the formation of the vanes and improve the delivery of the pump.
- the drawing of the cylinder 2 in fact usually requires a radius R at the junction between the base 3 and the cylindrical wall 2, the value of which must not fall below a certain limit, generally equal to the thickness of the sheet metal.
- the vanes 11 must be rounded with the same or a slightly greater radius at their corners which slide against the junction.
- the vane 11 On the opposite side, however, where there is no junction between the flange 14 of the support and the wall 2 of the cylinder, the vane 11 must have a sharp corner.
- the rotor 6 may be constructed from plastics material with a suitable choice of the material and the incorporation of the spindle 5 during moulding.
- the working of the latter which does not require precise tolerances in the portion of coupling with the rotor, is simplified.
- the fixing of the cylinder 2 onto the support 1 may be effected in the conventional manner shown in Figures 1 and 3, that is, by clamping the flange 19 of the cylinder 2 to the support 1 by screws 9 or other simpler means.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
In a pneumatic vane pump of known type, the outer casing is formed from a cast support (1) and a cylindrical body (2) of stamped sheet metal which constitutes the cylindrical seat for the rotor (6), with a consequent notable reduction in cost compared to the conventional solution with a cast cylindrical body.
Description
- The present invention relates to a pneumatic vane pump of the type comprising:
- - a rotor carrying the vanes and rotating in a cylindrical seat about an axis different from that of the seat itself,
- - an outer casing in which the cylindrical seat is formed,
- - inlet and outlet openings and unions for the air.
- Pumps of this type are commonly used on diesel engines for motor vehicles to create the low pressure needed to work vacuum-operated users including, for example, the servobrakes.
- Generally, such pumps have a cast outer casing closed by a cover which may also be cast or formed from sheet metal of sufficient thickness.
- Such solutions present no particular problems but are rather expensive, particularly because of the outer casing which requires rather complicated manufacturing equipment and rather long working times.
- The object of the present invention is to find a type of construction which simplifies the working with less complicated equipment, shorter times, and lower overall costs.
- This object is achieved by the invention in that the outer casing of the pump is constituted by (a) a cylinder of drawn sheet metal closed at one end by a base formed directly by the drawing of the cylinder itself, and (b) a support fixed to the motor and carrying the seat for rotation of the spindle of the rotor, a main flange which closes the cylinder and against which an end face of the rotor slides, the outlet ducts and openings for the air and the lubricating oil for the pump, and a second flange against which the stamped sheet metal cylinder bears and to which it is fixed.
- With this solution, the working of the cylindrical seat of the pump is eliminated since it is made by stamping; the costs of the pump and the casting are thus reduced in that casting is limited only to the flanged support which is easy to cast and work, and the equipment needed for mass-production is simplified.
- Further advantages and characteristics of the pneumatic vane pump of the invention will become clear from the detailed description which follows with reference to the appended drawings, provided purely by way of non-limiting example, in which:
- - Figure 1 is a longitudinal section of the pump with the air inlet opening and union located at its base,
- - Figure 2 is a partially sectioned side view of the punp with the air inlet opening and union located in correspondence with the support,
- - Figure 3 is a section taken on the line III-III of Figure 1,
- - Figure 4 is a partially sectioned view of a detail of Figure 2 on an enlarged scale,
- - Figure 5 is an enlarged detail of Figure 1, and
- - Figures 6, 7 and 8 show in detail different types of fixings of the cylinder to the support from those illustrated in Figure 1 and Figure 2.
- With reference to the drawings, the outer casing of the pump is constituted by a
support 1 and acylinder 2 having abase 3. Thesupport 1 carries a seat 4 for rotation of thespindle 5 of therotor 6, as well asoutlet ducts 7 and 8 for the air and lubricating oil. - The cylinder is fixed to the support by
screws 9 and arubber ring 10 ensures sealing from the exterior. - The
vanes 11 are housed ingrooves 12 in the rotor and slide against theiner surface 13 of thecylinder 2, against the flange 14 of the support and against theinner face 15 of thebase 3. As shown in Figure 1, theair inlet slot 16 andunion 17 are formed in thebase 3. - Figure 2 illustrates another arrangement of the air inlet opening and union, in which the
support 1 includes anair inlet duct 16a and aseat 17a for anair inlet union 28. Theunion 28 incorporates a non-return valve constituted by asleeve 29, preferably of plastics material, having anouter end 30 for attachment of the air inlet pipes and aninner portion 31 provided at its end with an apertured flange on which a rubber washer 32 bears. Thewasher 32, urged by the pressure difference existing between its two faces, prevents air from returning towards the inlet when the pressure of the air drawn in is less than that of the air in the pump. - It is known that, in a vane pump, when the number of vanes is increased, the compression or expansion ratio increases and the flow rate also increases slightly.
- Going from four to five vanes, the ratio increases by about 40% and the flow rate by 3%.
- It is possible to use these characteristics to compensate for the loss of air through leakage, which is sometimes greater in a pump according to the invention than in conventional pumps in which the working tolerances for the cylindrical seat and the sliding flanges are stricter, these being made by working with tools instead of by stamping.
- Figure 3 shows just such a rotor with five vanes.
- Figure 5, however, illustrates a device which may be used to simplify the formation of the vanes and improve the delivery of the pump.
- The drawing of the
cylinder 2 in fact usually requires a radius R at the junction between thebase 3 and thecylindrical wall 2, the value of which must not fall below a certain limit, generally equal to the thickness of the sheet metal. Clearly, thevanes 11 must be rounded with the same or a slightly greater radius at their corners which slide against the junction. - On the opposite side, however, where there is no junction between the flange 14 of the support and the
wall 2 of the cylinder, thevane 11 must have a sharp corner. - Apart from the difficulty of ensuring the constancy of the radius R in stamped cylinders, errors could arise during assembly of the pump, whereby the vanes could be mounted upside down with the corner in correspondence with the junction. In such a case, a passage for the air in correspondence with the flange 14 of the support would be forcibly created and left, with a resulting loss in volumetric efficiency.
- This disadvantage can be avoided by reducing the radius R through a coining or partial blanking operation on the
base 3, obtaining a form of the type illustrated in Figure 5. With this operation, which can be simultaneous with or follow the drawing of the cylinder, the radius R may even be completely eliminated. In some cases, asmall gap 18 may remain between the walls of thecylinder 2 and thebase 3 which is so small, however, of the order of a tenth of a millimetre, as not to affect the operation of the pump. This gap has been shown artificially large for greater clarity in Figure 5. - Again, in order to reduce the costs of the pump, the
rotor 6 may be constructed from plastics material with a suitable choice of the material and the incorporation of thespindle 5 during moulding. Thus, the working of the latter, which does not require precise tolerances in the portion of coupling with the rotor, is simplified. - The fixing of the
cylinder 2 onto thesupport 1 may be effected in the conventional manner shown in Figures 1 and 3, that is, by clamping theflange 19 of thecylinder 2 to thesupport 1 byscrews 9 or other simpler means. -
- Figure 6 shows a particular fixing solution wherein the
support 1 has agroove 20 for the insertion of thecylinder 2 which has asmall flange 21 to which theouter edge 22 of thegroove 20 is rivetted. The sealing ring 23 ensures sealing between thecylinder 2 and thesupport 1. - Figure 7 shows a different fixing solution: the
support 1 has twogrooves 24 and 25 and aflange 26. A rubber ring is housed in thegroove 24 to effect sealing between thecylinder 2 and thesupport 1. Thesheet metal cylinder 1 is brought into contact with theflange 26 and a sufficient number of portions of the end of its cylindrical wall are pressed into the groove 25 to ensure the connection. - Figure 8 shows a variant of the solution of Figure 7, in which the sheet metal is cut and forced into the
groove 27 instead of being pressed. - Naturally, the constructional details of the device may be varied from those described and illustrated by way of non-limiting example, in order to improve its operation and make it even cheaper, without thereby departing from the scope of the present invention.
Claims (10)
1. Pneumatic vane pump of the type comprising:
- a rotor (6) carrying the vanes (11) and rotating in a cylindrical seat about an axis different from that of the seat itself,
- an outer casing in which the cylindrical seat is formed,
- inlet and outlet openings and unions (7, 8, 16, 17; 16a, 17a) for the air, characterised in that the outer casing is constituted by (a) a cylinder (2) of drawn sheet metal closed at one end by a base (3) formed directly by the drawings of the cylinder itself, and (b) a support (1) fixed to the motor and carrying the seat (4) for rotation of the spindle (5) of the rotor (6), a main flange (14) which closes the cylinder (2) and against which an end face of the rotor (6) slides, the outlet ducts and openings (7, 8) for the air and the lubricating oil for the pump, and a second flange against which the stamped sheet metal cylinder (2) bears and to which it is fixed.
2. Pneumatic vane pump according to Claim 1, characterised in that the air inlet opening and union (16, 17) are located in correspondence with the base (3).
3. Pneumatic vane pump according to Claim 1, characterised in that the air inlet opening and union (16a, 17a) are located in correspondence with the support (1).
4. Pneumatic vane pump according to Claim 3, characterised in that the air inlet union (17a) is constituted by an element (28) formed in the casting of the support (1) and incorporating the non-return valve (31, 32) of the pump.
5. Pneumatic vane pump according to any one of the preceding claims, characterised in that the base (3) of the sheet metal cylinder (2) is pressed down towards the interior of the cylinder so as to eliminate entirely or reduce to several tenths of a millimetre the radius (R) at the junction between the base (3) and the cylindrical wall (2), the pressing down being effected by a coining or partial blanking operation.
6. Vane pump according to any one of the preceding claims, characterised in that the number of vanes (11) is greater than four, so as to increase the expansion or compression ratio of the pump and thus compensate for the larger working tolerances due to the making of the cylindrical seat by stamping.
7. Pneumatic vane pump according to any one of the preceding claims, characterised in that the cylinder (2) is fixed to the support (1) by a flange (19) on the cylinder itself and by connecting means constituted by screws (9), bolts or rivets.
8. Pneumatic vane pump according to any one of Claims 1 to 6, characterised in that the cylinder (2) is fixed to the support (1) by rivetting the outer edge (22) of a circumferential groove (20) formed on the flange (14) for sliding of the rotor (6) against a flange (21) provided on the cylinder (2) itself.
9. Pneumatic vane pump according to any one of Claims 1 to 6, characterised in that the support has two grooves (24, 25) one of which houses a sealing ring and into the other of which the wall of the cylinder (2) is pressed along its entire circumferential extent or only some portions thereof, to ensure the connection of the cylinder (2) to the support (1).
10. Pneumatic vane pump according to Claim 9, in which the wall of the cylinder (2) is cut at several places and forced into the fixing groove (27) instead of being pressed.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT5330484U | 1984-04-24 | ||
IT5330484U IT8453304V0 (en) | 1984-04-24 | 1984-04-24 | PNEUMATIC VANE PUMP WITH PRINTED SHEET BODY |
IT5417884U | 1984-12-17 | ||
IT5417884U IT8454178V0 (en) | 1984-12-17 | 1984-12-17 | PNEUMATIC VANE PUMP WITH PRINTED SHEET BODY |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0159968A2 true EP0159968A2 (en) | 1985-10-30 |
EP0159968A3 EP0159968A3 (en) | 1987-05-13 |
Family
ID=26329561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85830096A Withdrawn EP0159968A3 (en) | 1984-04-24 | 1985-04-22 | Pneumatic vane pump with body of stamped sheet-metal |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0159968A3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0644317A1 (en) * | 1993-09-16 | 1995-03-22 | SIHI GmbH & Co KG | Liquid ring pump |
US5509789A (en) * | 1993-09-16 | 1996-04-23 | Sihi Gmbh & Co Kg | Liquid ring pump having a sheet metal working chamber casing |
BE1014509A3 (en) * | 2001-04-09 | 2003-11-04 | Scroll Tech | Thermal screen with hermetic joint between end and dressing not volute orbital. |
WO2007054055A1 (en) * | 2005-11-09 | 2007-05-18 | Ixetic Hückeswagen Gmbh | Pump, particularly a van-cell vacuum pump |
WO2009115355A2 (en) * | 2008-03-17 | 2009-09-24 | Robert Bosch Gmbh | Fuel pump |
WO2012095245A3 (en) * | 2011-01-11 | 2013-06-27 | Magna Powertrain Ag & Co Kg | Pump |
CN105257543A (en) * | 2014-07-08 | 2016-01-20 | 悦马塑料技术有限公司 | Rotary vane pump for generating a vacuum |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2118446A5 (en) * | 1970-12-17 | 1972-07-28 | Trw Inc | |
FR2245220A7 (en) * | 1973-09-25 | 1975-04-18 | Corona & Co Spa | Petrol pump with cooled motor - liquid circulates between pump and motor chambers |
US3927956A (en) * | 1974-05-30 | 1975-12-23 | Carrier Corp | Fluid actuated motor |
US4408969A (en) * | 1980-05-31 | 1983-10-11 | Diesel Kiki Co., Ltd. | Vane compressor having improved rotor supporting means |
-
1985
- 1985-04-22 EP EP85830096A patent/EP0159968A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2118446A5 (en) * | 1970-12-17 | 1972-07-28 | Trw Inc | |
FR2245220A7 (en) * | 1973-09-25 | 1975-04-18 | Corona & Co Spa | Petrol pump with cooled motor - liquid circulates between pump and motor chambers |
US3927956A (en) * | 1974-05-30 | 1975-12-23 | Carrier Corp | Fluid actuated motor |
US4408969A (en) * | 1980-05-31 | 1983-10-11 | Diesel Kiki Co., Ltd. | Vane compressor having improved rotor supporting means |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0644317A1 (en) * | 1993-09-16 | 1995-03-22 | SIHI GmbH & Co KG | Liquid ring pump |
US5509789A (en) * | 1993-09-16 | 1996-04-23 | Sihi Gmbh & Co Kg | Liquid ring pump having a sheet metal working chamber casing |
AU673761B2 (en) * | 1993-09-16 | 1996-11-21 | Sihi Gmbh & Co Kg | Liquid ring gas pump |
CN1035837C (en) * | 1993-09-16 | 1997-09-10 | 西西股份有限公司 | Liquid ring gas pump |
BE1014509A3 (en) * | 2001-04-09 | 2003-11-04 | Scroll Tech | Thermal screen with hermetic joint between end and dressing not volute orbital. |
WO2007054055A1 (en) * | 2005-11-09 | 2007-05-18 | Ixetic Hückeswagen Gmbh | Pump, particularly a van-cell vacuum pump |
WO2009115355A2 (en) * | 2008-03-17 | 2009-09-24 | Robert Bosch Gmbh | Fuel pump |
WO2009115355A3 (en) * | 2008-03-17 | 2009-11-19 | Robert Bosch Gmbh | Fuel pump |
WO2012095245A3 (en) * | 2011-01-11 | 2013-06-27 | Magna Powertrain Ag & Co Kg | Pump |
CN105257543A (en) * | 2014-07-08 | 2016-01-20 | 悦马塑料技术有限公司 | Rotary vane pump for generating a vacuum |
Also Published As
Publication number | Publication date |
---|---|
EP0159968A3 (en) | 1987-05-13 |
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Inventor name: CORDIANO, ETTORE Inventor name: GARNERO, PIERINO |