EP3194723A1 - Rotary pump - Google Patents
Rotary pumpInfo
- Publication number
- EP3194723A1 EP3194723A1 EP15774989.6A EP15774989A EP3194723A1 EP 3194723 A1 EP3194723 A1 EP 3194723A1 EP 15774989 A EP15774989 A EP 15774989A EP 3194723 A1 EP3194723 A1 EP 3194723A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lid
- pump
- rotor
- guide
- cap
- 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
Links
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 239000012815 thermoplastic material Substances 0.000 claims 1
- 239000004033 plastic Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 239000012530 fluid Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229920006335 epoxy glue Polymers 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000003562 lightweight material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003319 Araldite® Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
-
- 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
- F01C21/104—Stators; Members defining the outer boundaries of the working chamber
- F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
-
- 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
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
-
- 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
- F04C2240/00—Components
- F04C2240/50—Bearings
- F04C2240/52—Bearings for assemblies with supports on both sides
Definitions
- the present invention relates to a rotary pump for fluids, and more specifically it relates to a lid for a rotary pump.
- the invention is applied in pumps using a rotor made of plastic material. More preferably, the invention is applied in the so-called single-vane pumps, i.e. pumps in which the rotor includes a single vane, and the following description mainly refers to this preferred application.
- Single-vane rotary pumps are known in the automotive field, where they are often used as vacuum pumps.
- Single-vane rotary pumps include a body, defining a chamber inside which a rotor rotates, and a closing lid.
- the rotor has a diametrical slot in which a vane is mounted.
- the chamber is divided by the rotor and the vane into a suction environment and a compression environment between which a pumped fluid is displaced.
- pumps using a rotor made of plastic material are known among the single-vane rotary pumps.
- Such pumps generally require a double guide for the rotary motion of the rotor, namely a first guide formed in the pump body and a second guide formed in the pump lid, the lid being made, according to the prior art, of die-cast metal.
- the rotor made of plastics is to be guided so as to form a structure closed at both sides of the socket of the vane housing, for reasons of mechanical strength, in particular at cold starts and in case of counter-rotations.
- document US 5, 181,843 discloses a rotary pump with double guide, as typically provided for by the prior art for pumps where the rotor can be made, for instance, of plastics.
- a problem of the prior art is due to the axial bulk of the pump, caused by the presence of the guide formed in the lid, if the guide is made of die-cast metal.
- Another problem of the prior art is due to the weight of the pump, caused by the fact that the lid in which the guide is formed is made of die-cast metal.
- the invention also concerns a method of manufacturing the pump.
- the rotary pump includes a lid made of metal sheet in which a guide for the rotary motion of the rotor is formed.
- the guide is achieved by means of a guiding hole formed in the lid, and the hole is sealed in fluid-tight manner by a cap of thin metal sheet.
- the lid and the cap are fastened together by means of adhesives, with or without interference fit between the lid and the cap, or by means of braze welding.
- the lid is fastened to a pump body by means of adhesives, with or without use of centring elements formed in the lid and arranged to interference fit with the pump body.
- Fig. 2 shows a plan view of the pump shown in Fig. 1 with the lid;
- FIG. 3 shows a cross-sectional view of the pump shown in Fig. 2 taken along line A - A, in a 2: 1 scale;
- - Fig. 4 shows a detail Z of the cross-sectional view shown in Fig. 3, in a 5: 1 scale.
- a pump 100 is for instance a single- vane rotary vacuum pump.
- Pump 100 has a body 101 with an inner wall 114.
- Pump body 101 defines, together with a pump lid 106, a pumping chamber 115, with preferably elliptical cross-section.
- Rotor 102 is located inside pumping chamber 1 15.
- Rotor 102 used in the present invention is a vane rotor, preferably a single-vane rotor.
- single-vane rotor 102 has a radial slot where a vane 103, radially slidable within the same slot, is mounted.
- Rotor 102 is made of a lightweight material, for instance thermoplastic or thermosetting or even composite material.
- Suction openings 104, 105 are formed in inner wall 114 of pump body 101.
- such openings equipped with non-return valves, known per se, can be connected to components requiring a vacuum for operating, such as for instance brake booster, EGR (Exhaust Gas Recirculation) valves or other motor vehicle services.
- EGR Exhaust Gas Recirculation
- An exhaust opening 116 is further formed in inner wall 114 of the pump, in order to exhaust a fluid having been sucked and compressed.
- a dragging joint 113 is located externally to pump body 101 and can be connected to a first end of rotor 102, the latter being arranged to receive a rotary motion from a driving member (not shown).
- Pump body 101 includes, preferably in a proximal zone with respect to dragging joint 113, a first guide 109 arranged to guide the rotary motion of rotor 102 (Fig. 3).
- lid 106 of pump 100 is made of metal sheet, for instance metal sheet having a thickness preferably in the range 2.5 mm to 4 mm.
- pump lid 106 includes a second guide 110 arranged to guide the rotary motion of rotor 102 (Figs. 3 and 4).
- the second guide 110 consists of a guiding hole formed in metal sheet lid 106 (Fig. 3).
- guiding hole or support 110 is made, in known manner, by fine blanking and/or by chamfering.
- the second guide or support 110 formed in lid 106 is arranged to cooperate with the rotor preferably over its whole thickness (Fig. 4).
- guiding hole or support 110 is closed by a cap 111, for instance a cap made of thin metal sheet having a thickness in the range 0.6 mm to 1 mm (Figs. 3 and 4).
- metal sheet used for both lid 106 and cap 111 denotes a metal sheet brought to a predetermined thickness by rolling.
- cap 111 to pump lid 106 Fastening of cap 111 to pump lid 106 is obtained, in the preferred embodiment, through adhesives with high thermal and mechanical strength and with sealing power, applied at least onto portions of the contact surfaces between cap 111 and pump lid 106, said surfaces being denoted by symbols "x" in Fig. 4.
- Possible adhesives are for instance epoxy glues, in particular two-component epoxy glues, such as for instance araldite®.
- fastening between cap 111 and pump lid 106 is obtained by means of one of the adhesives mentioned above and interference fit between cap 111 and lid 106.
- fastening between cap 111 and pump lid 106 is obtained by means of low-temperature braze welding, of known type.
- the second guide or support is formed in lid 106 by means of indentation or half-blanking.
- the indented or half-blanked portion obtained in this manner is arranged to cooperate with rotor 102 by guiding it when the rotor is rotating.
- lid 106 made in accordance with the present invention is fastened to body 101 by means of adhesives similar to those described in connection with the fastening of the cap to the lid.
- the adhesives employed are applied at least onto portions of contact surfaces between the cap and the pump body, said surfaces being denoted by symbols "+" in Fig. 3.
- centring elements 112 are provided in the cap and are arranged to interference fit with recesses 119 formed in pump body 101, thereby assisting in fastening lid 106 to body 101.
- Centring elements 112 are formed for instance by means of half-blanking or indentation of lid 106.
- fastening between cap 106 and pump body 101 is obtained by means of fastening screws or by means of adhesives and positioning screws.
- Pump 100 is connected, in known manner, to a driving member (for instance, a drive shaft or a cam shaft of a motor vehicle) by means of dragging joint 113.
- a driving member for instance, a drive shaft or a cam shaft of a motor vehicle
- 113 is coupled to rotor 102 and transmits the rotary motion of the driving member to the rotor itself.
- rotor 102 rotates counter-clockwise.
- chamber 114 of pumping chamber 115 so as to cyclically divide chamber 1 15, in fluid-tight manner, into at least one suction area, with variable volume, and at least one compression and exhaust area, with variable volume.
- rotor 102 during its rotary motion, is guided either by the two guides 109, 110, described above, or by the first guide 109, formed in pump body 101, and by the second guide 110, formed in metal sheet lid 106 of the pump.
- the axial bulk reduction is moreover achieved thanks to other features included in further embodiments of the pump of the present invention, such as: fastening lid 106 to the pump body through adhesives and interference fit between centring elements 112 in the lid and recesses 119 in body 101, hence without use of screws (the heads of which contribute to the bulk increase);
- metal sheet cap 111 fastened to lid 106 through interference fit and/or adhesives.
- centring elements 112 provided in accordance with variant embodiments of the present invention, by cooperating with recesses 119 formed in pump body 101, make centring of the lid relative to the body easier and, through the interference, form further means for connecting the parts.
- a further advantage of the present invention is due to the lower weight of the metal sheet lid with respect to a conventional lid of die-cast metal.
- reducing the axial bulk and the weight of the pump allows an easier installation of the pump of the present invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO20140723 | 2014-09-15 | ||
PCT/IB2015/057044 WO2016042460A1 (en) | 2014-09-15 | 2015-09-14 | Rotary pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3194723A1 true EP3194723A1 (en) | 2017-07-26 |
EP3194723B1 EP3194723B1 (en) | 2023-03-08 |
Family
ID=51871220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15774989.6A Active EP3194723B1 (en) | 2014-09-15 | 2015-09-14 | Rotary pump |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3194723B1 (en) |
WO (1) | WO2016042460A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1141570B (en) * | 1980-04-11 | 1986-10-01 | Leonardo Beltrame | IMPROVEMENT OF ROTARY COMPRESSOR BODIES, AND METHOD FOR THE CONSTRUCTION OF THEM |
DE3324831A1 (en) * | 1982-07-24 | 1984-03-22 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Construction unit |
US5181843A (en) | 1992-01-14 | 1993-01-26 | Autocam Corporation | Internally constrained vane compressor |
DE112009000258A5 (en) * | 2008-03-01 | 2011-04-14 | Ixetic Hückeswagen Gmbh | Vacuum cover |
KR20090104151A (en) * | 2008-03-31 | 2009-10-06 | 맹혁재 | Vane compressor of enhanced airtightness |
IT1402417B1 (en) * | 2010-10-26 | 2013-09-04 | O M P Officine Mazzocco Pagnoni S R L | MONOPAL PUMP |
DE202010013074U1 (en) * | 2010-12-07 | 2011-05-12 | KINGSTON COMP CO., Ltd., Tucheng City | Rotary vane compressor |
-
2015
- 2015-09-14 EP EP15774989.6A patent/EP3194723B1/en active Active
- 2015-09-14 WO PCT/IB2015/057044 patent/WO2016042460A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3194723B1 (en) | 2023-03-08 |
WO2016042460A1 (en) | 2016-03-24 |
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