EP3470624A1 - Pompe rotative - Google Patents

Pompe rotative Download PDF

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Publication number
EP3470624A1
EP3470624A1 EP18199617.4A EP18199617A EP3470624A1 EP 3470624 A1 EP3470624 A1 EP 3470624A1 EP 18199617 A EP18199617 A EP 18199617A EP 3470624 A1 EP3470624 A1 EP 3470624A1
Authority
EP
European Patent Office
Prior art keywords
cover
valve
delivery chamber
valve cover
rotary 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Withdrawn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
EP18199617.4A
Other languages
German (de)
English (en)
Inventor
Holger Braasch
Thomas Finsterle
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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 Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP3470624A1 publication Critical patent/EP3470624A1/fr
Withdrawn legal-status Critical Current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
    • F04C18/34—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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • 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
    • F04C2240/30—Casings or housings
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring

Definitions

  • the invention relates to a rotary pump, in particular a vacuum pump, with a housing and arranged in the housing and / or at least partially formed by the housing conveying chamber.
  • the delivery chamber has an inlet for a fluid on a suction side and an outlet for the fluid on a pressure side.
  • the rotary pump includes at least one valve for removing fluid from the delivery chamber.
  • a rotor is arranged in the delivery chamber.
  • a valve such as a reed valve
  • Such a valve may be referred to as a relief valve or cold start valve.
  • a valve such as a reed valve
  • an outlet valve By such a valve to be prevented in particular that false air flows into the delivery chamber.
  • a valve may be referred to as an outlet valve.
  • the invention relates to a rotary pump, in particular a vacuum pump, having a delivery chamber which has an inlet for a fluid on a suction side and an outlet for the fluid on a pressure side, a rotor arranged in the delivery chamber, a delivery chamber housing which has a first sealing surface, and with a lid having a second sealing surface.
  • the delivery chamber housing and the lid advantageously at least partially surround the delivery chamber over a chamber circumference.
  • the delivery chamber housing and the cover are preferably in contact with each other with the sealing surfaces and thereby form with each other a sealing joint at least partially surrounding the delivery chamber in order to seal the delivery chamber in at least one operating state.
  • the first sealing surface and the second sealing surface preferably at least partially surround the delivery chamber. They advantageously at least partially surround the delivery chamber.
  • the delivery chamber housing preferably has a bottom, an axially extending peripheral wall, an opening which forms an axial end face of the delivery chamber opposite the bottom or which is formed in an axial end face of the delivery chamber opposite the bottom.
  • the cover preferably closes the opening.
  • the first sealing surface is advantageously formed in the peripheral wall.
  • the lid forms at least one valve.
  • the lid advantageously has a sealing function and a valve function.
  • the cover preferably forms a mechanical device with which the accumulation or deflation of the fluid in the delivery chamber is regulated.
  • the cover has at least one valve cover.
  • the valve cover is only partially elastically deformable by a fluid pressure prevailing in the delivery chamber or elastically yielding.
  • the valve cover deforms only partially at a certain fluid pressure in the delivery chamber or are only partially by a certain fluid pressure in the delivery chamber and deforms into its original form or moves to its original position when a certain fluid pressure in the delivery chamber is exceeded.
  • the valve cover is only partially arranged immovably on the delivery chamber housing.
  • the valve cover preferably comprises at least one region which is elastically deformable or elastically yielding due to the fluid pressure prevailing in the delivery chamber and at least one region which is not elastically deformable or elastically yielding due to this fluid pressure.
  • the delivery chamber housing and the valve cover are joined together, in particular screwed together.
  • the delivery chamber housing and the valve cover can be riveted together, welded, glued or the same.
  • the valve cover advantageously forms the second sealing surface. Due to the elastic deformation or the elastic yielding of the valve cover in the region of its sealing surface, the second sealing surface preferably moves away from the first sealing surface, whereby a relief gap is formed through which fluid can escape from the delivery chamber.
  • the valve cover advantageously has at least one elastically deformable or elastically yielding region, which is movable relative to the delivery chamber housing by the fluid pressure prevailing in the delivery chamber in order to be able to widen the sealing joint to the relief gap through which fluid located in the delivery chamber can escape.
  • the delivery chamber may be arranged in a pump housing, wherein the pump housing preferably forms the delivery chamber at least partially.
  • the cover or valve cover may simultaneously be a cover of the delivery chamber and a lid of the pump housing. That is, the lid or valve cover separates the delivery chamber directly from the surrounding the pump Environment and is not located within a pump housing, but is itself part of the pump housing respectively forms its outside with.
  • the delivery chamber housing and the cover / valve cover form the outer pump housing. If the cover / valve cover is opened, the delivery chamber is open to the environment, without another part, for example, another cover or a different, the bottom of the delivery chamber opposite end face of the delivery chamber forming part, component must be removed.
  • the cover / valve cover of the delivery chamber is part of the outer housing of the pump and an outside of the cover / valve cover facing away from the delivery chamber is in direct contact with the environment of the pump.
  • the cover or the valve cover preferably opens the delivery chamber temporarily by its regional elastic deformation or its partial yielding elastic yielding into the environment of the rotary pump.
  • the cover / valve cover preferably forms at least one valve which connects the delivery chamber directly to the environment of the pump and does not discharge into a conduit or a storage container firmly connected to the pump.
  • the environment may be, in particular, the air surrounding the pump. This does not exclude that the pump, in particular if lubricant or oil can escape from the delivery chamber through the cover / valve cover, for example, in the state connected to a plant or an aggregate, such as an electric or internal combustion engine for a vehicle, is arranged so that the exiting through the lid / valve cover pollutants are collected so as not to pollute the environment.
  • the lid / valve cover connects the delivery chamber directly with the surrounding air, the pump itself does not include a collecting or discharging device for collecting or discharging any leaked through the cover / valve cover pollutants.
  • the valve cover may form the end wall of the delivery chamber opposite the bottom of the delivery chamber or a cover.
  • the cover may be connected to the axial peripheral wall in the region of the opening and preferably completely cover the opening.
  • the connection may preferably be such that the cover can be lifted elastically in regions from the peripheral wall, if a fluid pressure in the delivery chamber exceeds a predetermined limit.
  • the cover advantageously forms a valve body of the valve, which can be moved back and forth between a closed position and an open position.
  • at least one gap between the peripheral wall and the valve cover or cover can open and fluid can escape, bypassing the outlet from the delivery chamber through the at least one gap, for example, into the environment of the pump.
  • a seal may be arranged in the form of, for example, a sealing ring or a liquid seal, so that the valve body, the delivery chamber in the region of the peripheral wall in at least one operating state, for example, a stoppage of Pump, tightly closed.
  • a sealing depression which is filled in the operation of the rotary pump with a sealing liquid.
  • the valve cover may for example be formed from a metal, such as a spring steel, which allows due to its material properties that the valve cover often elastically deform and / or bend without thereby the tightness of the delivery chamber in normal operation, that is at pressure conditions in the Delivery chamber with a pressure below a limit at which the valve cover or a part of the valve cover is moved from the delivery chamber housing is reduced.
  • a metal such as a spring steel
  • the valve cover can be fixedly connected, for example screwed, to the delivery chamber housing at two points located opposite one another with respect to the delivery chamber.
  • a straight line that runs through the two fastening points can also cut a central longitudinal axis of the delivery chamber and / or the axis of rotation of the rotor in the case of a circular delivery chamber.
  • at least a portion of the valve cover having a maximum distance from the straight line for example along a line that is preferably parallel to the straight line, may then elastically extend from the valve cover facing away from the axial peripheral wall are moved away, so that opens at least one gap and connects the delivery chamber with the environment.
  • at least two gaps can be opened, which are arranged in mirror image relative to each other with respect to the straight line.
  • the material thickness of the valve cover both the location at which the at least one gap or the plurality of gaps is formed and the beginning of the elastic deformation or the elastic yielding can be determined.
  • the material thickness of the valve cover both the location at which the at least one gap or the plurality of gaps is formed and the beginning of the elastic deformation or the elastic yielding can be determined.
  • the lid is advantageously designed in several parts.
  • the lid may consist of at least two, preferably separate, lid parts.
  • the cover parts are advantageously arranged one above the other along the axis of rotation of the rotor.
  • the lid is preferably designed in sandwich construction.
  • the valve cover is preferably formed by a first cover part. In principle, it is conceivable that the cover is made in one piece and, for example, has only the second sealing surface having the valve cover.
  • a second cover part of the cover may form a stop for the first cover part / the valve cover, which limits an opening width of the gap.
  • the lid preferably has a stopper lid which forms a stop for the valve cover.
  • the stopper cover is preferably formed by the second cover part.
  • the stopper cover is located on the valve cover.
  • the valve cover is advantageously arranged between the delivery chamber and the stopper cover.
  • the stopper cover may for example be made of a metal, wherein the stopper cover preferably has a much higher rigidity than the valve cover. Basically, it is conceivable the attack for the valve cover by an on the mounted rotary pump adjacent housing or stop an aggregate, such as the electric or internal combustion engine to realize.
  • the cover has a valve cover which forms the second sealing surface and comprises at least one valve opening communicating with the delivery chamber.
  • the cover preferably has a valve cover, which is partially elastically deformable or elastically yielding by the fluid pressure prevailing in the delivery chamber, forms the second sealing surface, and comprises at least one valve opening communicating with the delivery chamber.
  • the valve opening may in particular be a through opening introduced into the valve cover by punching, laser cutting or other methods.
  • the valve cover may also have two, three or any number of valve openings.
  • the valve cover has at least one valve opening which communicates with the pressure side of the rotary pump.
  • the cover advantageously has a further valve cover which, depending on the fluid pressure in the delivery chamber, opens or closes at least one valve opening of the valve cover having the second sealing surface.
  • the further valve cover is preferably formed by a third cover part.
  • the stopper cover is located on the other valve cover.
  • the further valve cover is preferably located on the second sealing surface having the valve cover.
  • the further valve cover is advantageously arranged between the second sealing surface having the valve cover and the stopper cover.
  • the valve cover having the second sealing surface is advantageously arranged between the delivery chamber and the further valve cover. In principle, it is conceivable that the valve cover having the second sealing surface and the at least one valve opening is designed to be completely immovable.
  • the further features of the further valve cover can essentially correspond to the properties of the valve cover having the at least one valve opening and / or the second sealing surface.
  • the other valve cover can with the axial peripheral wall of the delivery chamber a gap form when an overpressure within the delivery chamber exceeds a predetermined limit, which may be the same as or different from the limit value mentioned in the first aspect.
  • the further valve cover may be provided to form a second valve and be shaped so that it covers the valve orifices of the valve cover having the second sealing surface and seals tightly in a first position in at least one operating state of the pump.
  • the further valve cover preferably has at least one elastically deformable or elastically yielding region which opens or closes the at least one valve opening of the valve cover having the second sealing surface as a function of the fluid pressure prevailing in the delivery chamber.
  • the further valve cover in the region of the valve openings can be elastically deformed and / or bent and moved to a second position in which the valve opening / s Transfer chamber with the environment connects in pairs.
  • the further valve cover preferably has at least one elastically deformable or elastically yielding region, which impedes the elastic deformation or elastic yielding of the valve cover having the second sealing surface, whereby a necessary opening pressure, starting from which a part of the valve cover having the second sealing surface of the conveyor housing moved away, can be increased. If the fluid pressure in the delivery chamber, possibly despite the open valve opening / s, reaches or exceeds the limit value necessary to open the gap, the two valve covers are elastically bent or elastically yield both valve covers and the gap or column opens.
  • the further valve cover advantageously forms a reinforcing part for the valve cover having the second sealing surface in that the valve cover rests on the valve cover having the second sealing surface in at least one region of the further valve cover, so that at least in this region the valve cover having the second sealing surface and the valve cover more valve cover must be bent together elastic or yield elastically in order to open the gap that connects the delivery chamber with the environment of the pump can.
  • This allows the second sealing surface having valve cover made of a material be formed, which has a total of a lower material thickness, which can lead to a savings in material, weight and cost.
  • the material of the valve cover having the second sealing surface may also have other elastic properties, for example, if the elastic closing of the gap is effected at a pressure drop in the delivery chamber solely by the further valve cover.
  • the valve cover having the second sealing surface may also have a higher rigidity, preferably a greater material thickness, compared with the other valve cover, whereby a necessary opening pressure, above which a part of the valve cover having the second sealing surface moves away from the conveyor housing, can be increased , Due to the higher stiffness compared to the other valve cover, preferably higher material thickness, of the valve cover having the second sealing surface, the necessary fluid pressure through which the valve cover having the second sealing surface is elastically deformed or elastically yielded in certain regions is greater than the necessary fluid pressure. by the further valve cover partially elastically deformed or partially yielding elastic.
  • the valve cover having the second sealing surface has a multilayer structure.
  • the valve cover having the second sealing surface has at least two cover layers or cover plates arranged on one another, which are identical or different from each other.
  • the cover layers or cover plates may differ in particular from one another by the material, the rigidity and / or the material thickness.
  • one of the cover layers or cover plates forms the second sealing surface.
  • the stopper cover preferably forms a stop for the further valve cover in the region of the valve openings and / or a stop for the second sealing surface having the valve cover and / or the other valve cover in the formation of the gap that connects the delivery chamber with the environment of the pump.
  • the stopper cover is formed in the manner and / or arranged that only certain, by the stopper cover can deform or yield predetermined areas of the valve cover / the valve cover by a fluid pressure and other deformed by the stopper cover areas of the valve cover / the valve cover can not deform or yield by the fluid pressure.
  • the valve cover having the second sealing surface advantageously completely covers the axial end face of the delivery chamber facing away from the bottom of the delivery chamber and preferably has at least one valve opening in the region of the overlap.
  • the further valve cover has a shape such that it sealingly seals the at least one valve opening at least in an operating state of the pump and is elastically deformed or elastically yielded upon reaching a predetermined pressure in the delivery chamber to open the at least one valve opening gradually or abruptly.
  • the at least one valve cover having the second sealing surface and optionally the further valve cover which can be elastically bent to form the gap / gap or can elastically yield, and the at least one stopper cover together form a pressure relief valve and / or a return valve.
  • the at least one valve opening of the valve cover having the second sealing surface, the at least one further valve cover which covers the valve opening / s, and the at least one stop cover together form an outlet valve or a return valve.
  • the stop cover preferably limits an opening movement of the further valve cover at least in the region of the at least one valve opening of the valve cover having the second sealing surface.
  • the stop cover advantageously limits an opening movement of the further valve cover at least in the area of the at least one valve cover having the second sealing surface and / or the further valve cover at least in the area of the at least one reinforcement part for the valve cover having the second sealing surface.
  • At least one of the delivery chamber facing side of the stopper lid of the lid can be shaped so that the opening movements of the at least one valve cover are limited by the shape alone.
  • the stopper cover must be a rigid part, which can not be deformed even if the at least one valve cover is pressed with a maximum pressing force against the stopper cover.
  • the stopper lid may have a shape that has the required rigidity, for example, by means of reinforcing ribs or other known measures.
  • the stopper cover can rest on the at least one valve cover in the region of the straight line which connects the two fastening points for the cover.
  • the cover parts may preferably be plate-shaped, that is, be cut out as a stamped parts or from a plate with the same thickness throughout, for example with a laser or water jet.
  • the two or three cover parts of the cover can be connected to the delivery chamber housing via a common connection element / common connection elements, for example screws.
  • the lid additionally has a bearing function for the rotor.
  • the lid has an opening or recess into which the rotor engages or passes.
  • the engaging in the opening or recess or the opening or recess by cross-rotor is advantageously mounted in the opening or recess on the lid.
  • the stop cover has a corresponding material thickness, which is preferably larger in comparison with a material thickness of the stop cover in the absence of bearing function.
  • the valve cover covering the at least one valve opening may in particular be wing-shaped.
  • the at least one Valve opening having valve cover two or another number of valve openings which may coincide with respect to the straight line between the two attachment points, which may coincide with a straight line through a center of the further valve cover and / or the at least one valve opening having valve cover and / or the stopper cover are arranged symmetrically.
  • a movement axis of the valve cover / valve cover for the valve openings and the gap formation can be arranged transversely, preferably perpendicular, to the axis of rotation of the rotor of the rotary pump arranged in the delivery chamber.
  • the opening pressure of the valve cover and thus the valve formed thereby can be specified by the choice of material thickness of the valve cover / the valve cover.
  • a size of a dead space between the delivery chamber and, for example, the valve cover covering the at least one valve opening can be influenced by a material thickness of the valve cover having the at least one valve opening in the region of the at least one valve opening.
  • the rotary pump is designed as a gas pump.
  • the rotary pump is designed as a vacuum pump, which supplies at least one machine unit of a motor vehicle, for example a brake booster, with negative pressure in the installed state.
  • the rotary pump may be a pump of a pump unit or tandem pump consisting of at least two pumps.
  • the pump unit has the described described as a vacuum pump rotary pump and a lubricant and / or coolant pump, preferably engine lubricating oil pump on.
  • a further aspect of the invention relates to a valve, in particular a valve for a rotary pump, in particular a vacuum pump, wherein the valve is formed by a cover which is provided for closing a hollow body, for example an axial end face of a delivery chamber of a rotary pump.
  • the lid may in particular be a two-piece lid or a three-piece lid, with features that have already been described.
  • the FIG. 1 shows in an exploded view a three-piece lid 1, 2, 3, which forms a plurality of valves.
  • the lid 1, 2, 3 is mounted in a mounted state on a conveying chamber 10 having a delivery chamber housing 8 a rotary pump.
  • the rotary pump is designed as a vacuum pump for a motor vehicle. It is intended to supply a brake booster with a negative pressure.
  • the delivery chamber housing 8 has a first sealing surface 35 and the cover 1, 2, 3 has a second sealing surface 36.
  • the delivery chamber housing 8 and the cover 1, 2, 3 lie with their sealing surfaces 35, 36 to each other and together form a surrounding the delivery chamber 10 sealing joint to seal the delivery chamber 10.
  • the lid 1, 2, 3 forms four valves in this embodiment.
  • the cover 1, 2, 3 consists of a first cover part, which forms a first valve cover 1, a second cover part, which forms a stop cover 3, and a third cover part, which forms a second valve cover 2.
  • the first stopper 1 forms the second sealing surface 36.
  • the first sealing surface 35 further comprises a sealing recess, not shown, which extends around the delivery chamber 10 and during operation of the Rotary pump is filled with a sealing liquid. In principle, it is also possible to dispense with the sealing depression filled with the sealing liquid.
  • the cover 1, 2, 3 having rotary pump indicated with a delivery chamber 10 and a rotor 9 disposed therein.
  • the rotary pump is designed as a vane pump. It is designed as a motor vehicle pump.
  • the lid 1, 2, 3 shown in exploded view is indicated in the assembled state in dotted lines, wherein the lid 1, 2, 3 is shown to be transparent.
  • the delivery chamber 10 comprises a bottom 7, a circumferential wall 6 surrounding the delivery chamber 10, which extends in an axial direction X, and an opening 5, which can be closed with the cover 1, 2, 3.
  • the axial peripheral wall 6 simultaneously forms part of the delivery chamber housing eighth
  • the first valve cover 1 has on two opposite sides in each case a nose, each having a connection opening, by means of which the first valve cover 1 can be connected via connecting elements 15 fixed to the delivery chamber housing 8.
  • the first valve cover 1 further has two valve openings 11, 12 which are arranged in mirror image with respect to an axis of symmetry A of the lid 1, 2, 3.
  • the first valve cover 1 has elastically deformable or elastically yielding regions 13, 14 with respect to the symmetry axis A, preferably in mirror image opposite ends, which at least in an operating state of the rotary pump in which a fluid pressure in the delivery chamber 10 is equal to or greater than a predetermined maximum pressure.
  • the first valve cover 1 made of an elastic material, in particular a metal with a corresponding elasticity, such as a spring steel or spring steel.
  • the first valve cover 1 may, for example, be punched out of a material plate or be cut out of a material plate by means of a suitable cutting method.
  • the material thickness of the first valve cover 1 in the axial direction X can be the same everywhere or the first valve cover 1 can have regions of different thicknesses of material, for example towards the center or axis of symmetry A, becoming increasingly thicker.
  • the second valve cover 2 is also formed as axisymmetric body and includes the elastically deformable or elastically resilient portions 21, 22, 23, 24. Furthermore, the second valve cover 2 as the first valve cover 1 has two opposing lugs, each having a connection opening, wherein the A symmetry axis A extends through the center of both connection openings and the connection openings for connecting the cover 1, 2, 3 are aligned with the connecting openings of the first valve cover 1, so the connecting elements 15 simultaneously reach through the connecting openings of the first valve cover 1 and the connecting openings of the second valve cover 2.
  • the areas 21, 22 of the second valve cover 2 tightly close the valve openings 11, 12 of the first valve cover 1 in at least one operating state of the rotary pump, so that no fluid from and into the delivery chamber 10 through the valve openings 11, 12 in or out of the environment U can reach the rotary pump. Only when the fluid pressure in the delivery chamber 10 exceeds an at least substantially predeterminable limit, which is greater than an ambient pressure of the environment U, the areas 21, 22 of the second valve cover 2 are pushed away elastically from the surface facing the first valve cover 1, and Fluid can escape through the valve openings 11, 12 from the delivery chamber 10.
  • the limit pressure at which the regions 21, 22 of the second valve cover 2 deform elastically or give way elastically is less than the maximum pressure at which the regions 13, 14 of the first valve cover 1 deform elastically or yield elastically.
  • the valve openings 11, 12 can form an outlet from the delivery chamber 10, through which a fluid sucked in by the rotary pump can be discharged into the environment U.
  • the valve opening 11 is associated with a suction side of the rotary pump.
  • the valve opening 12 is associated with a pressure side of the rotary pump. In principle, the valve opening 11 can be dispensed with.
  • the regions 23, 24 of the second valve cover 2 lie above or on the regions 13, 14 of the first valve cover 1.
  • the regions 23, 24 of the second valve cover 2 overlap the regions 13, 14 of the first valve cover 1 at least in regions.
  • a greater pressure within the delivery chamber 10 is necessary to the areas 13, 14 of the first valve cover 1 and at least partially covering areas 23, 24 of the second valve cover 2 to open the discharge gap 16 (see FIG. 2 ) to move.
  • the areas 23, 24 of the second valve cover 2 complicate the elastic deformation or the elastic yielding of the valve cover 1.
  • a material thickness of the first valve cover 1 can be reduced when the areas 13, 14 of the first Valve cover 1 are at least partially overlapped by the regions 23, 24 of the second valve cover 2, so that an opening force to open the relief gap 16 must overcome both an elastic reaction force of the first valve cover 1 and the second valve cover 2.
  • the regions 23, 24 of the second valve cover 2 can be dispensed with, if a material thickness of the first valve cover 1 in the areas 13, 14 is designed so that the first valve cover 1 alone, the elastic counterforce, which counteracts the opening of the gap 15, applies.
  • the areas 21, 22 and the areas 23, 24 can be moved independently, that is, an opening movement of the areas 21st , 22 has no effect on an opening movement of the areas 23, 24 through the areas 13, 14 of the first valve cover 1, and vice versa.
  • the stopper cover 3 is also formed as an axisymmetric body and includes the stops 32, 33 for the areas 13, 14 of the first valve cover 1, respectively, the areas 23, 24 of the second valve cover 2, and the areas 21, 22 of the second valve cover 2. Further the stopper cover 3, like the second valve cover 2 and like the first valve cover 1, two opposing lugs, each having a connection opening, wherein the axis of symmetry A extends through the center of both connection openings and the connection openings for connecting the lid 1, 2, 3 with the connecting openings of the first valve cover 1 and the connecting openings of the second valve cover 2 are aligned, so that the connecting elements 15 at the same time pass through the connection openings of all lid parts.
  • the stopper cover 3 is designed so that, in contrast to the first valve cover 1 and second valve cover 2 due to the forces acting in the delivery chamber 10 fluid pressures and pressures can not bend, neither elastic nor inelastic. It is preferably a shaped metal plate, as the dashed lines shown bending lines 34 should indicate. It is here under the term bending line 34 also understood a line along which a material thickness of the stopper cover 3 changes.
  • FIG. 2 shows in a perspective view of a rotary pump with the lid 1, 2, 3 of the FIG. 1 which forms four valves for the rotary pump, in particular a pressure relief valve and / or a bypass valve and / or an outlet valve and / or a reed valve.
  • the cover 1, 2, 3 comprises from outside to inside the stopper cover 3, the second valve cover 2, of which only the regions 23, 24 can be seen, and the first valve cover 1.
  • the stopper cover 3 forms two stops 32, 33, the opening movement of the first valve cover 1, respectively the areas 13, 14 of the first valve cover 1, and an opening movement of the second valve cover 2, respectively the areas 21, 22, 23, 24 of the second valve cover 2, limit.
  • the stopper cover 3 is not over the entire surface on the second valve cover 2, but has a distance to the second valve cover 2 in areas which are parallel to the axis of symmetry A and spaced from this maximum in the embodiment, the maximum opening width of the gap sixteenth certainly.
  • the connecting elements 15 pass through in the region of the lugs all three cover parts 1, 2, 3 and thus the two valve covers 1, 2 and the stopper cover 3 to the lid 1, 2, 3 fixed to the delivery chamber housing 8 to connect.
  • the stopper cover 3 is formed as a solid plate, for example a solid metal plate, which has been deformed along the caressing bending lines 34 either in a press or has been changed by, for example, cutting processes with regard to material thickness.
  • the stopper cover 3 is in a central region about the axis of symmetry A plan on the second valve cover 2 and opens with increasing distance to the line of symmetry A an expanding gap between the bottom 31 of the stopper cover 3 and a surface of the first valve cover 1 and the second valve cover second
  • the region 13 of the first valve cover 1, the region 23 of the second valve cover 2 and the stop 32 of the stopper cover 3 form a cold start valve, the one Damage to the rotary pump, in particular a vacuum pump, prevents cold start of the rotary pump.
  • the area 14 of the first valve cover 1, the area 24 of the second valve cover 2 and the stop 33 of the stop cover 3 form a return valve, which prevents damage to the rotary pump, in particular a vacuum pump, during reverse rotation of the rotary pump.
  • valve opening 11 of the first valve cover 1, the portion 21 of the second valve cover 2 and the stopper 33 of the stopper cover 3 form a return valve, which prevents damage to the rotary pump, in particular a vacuum pump, during reverse rotation of the rotary pump, which through the valve opening 11 and the Area 21 formed return valve in comparison to the formed by the areas 14, 24 return valve at a lower fluid pressure.
  • the return valve formed by the valve opening 11 and the region 21 can also be dispensed with.
  • valve opening 12 of the first valve cover 1, the region 22 of the second valve cover 2 and the stop 32 of the stopper cover 3 form an outlet valve, through which a fluid mixture from the pressure side of the rotary pump, in particular the vacuum pump, is discharged into the environment U and prevented that fluid from the environment U flows into the delivery chamber 10.
  • FIG. 3 shows an enlarged side elevational view of the lid 1, 2, 3 in the area in which the gap 16 can open. From the stopper cover 3 is one of the stops 32, 33 to see the possible elastic deformation or a possible elastic yielding of the first valve cover 1 in the areas 13, 14 and a possible elastic deformation or a possible elastic yielding of the second valve cover 2 in the areas 21, 22, 23, 24 limited.
  • the stopper cover 3 is designed as a solid plate with a material thickness that exceeds a material thickness of the first valve cover 1 and the second valve cover 2 by a multiple.
  • FIG. 4 is a second embodiment of a rotary pump with a delivery chamber 10 'having an inlet for a fluid on a suction side and an outlet for the fluid on a pressure side, in the delivery chamber 10' arranged rotor 9 ', a delivery chamber housing 8', the one first sealing surface 35 'and a, several valves forming cover 1', 2 ', 3', which has a second sealing surface 36 ', shown in an exploded view.
  • the delivery chamber housing 8 'and the cover 1', 2 ', 3' lie with the sealing surfaces 35 ', 36' to each other and together form a the conveying chamber 10 'surrounding sealing joint to seal the delivery chamber 10'.
  • the rotor 9 ' has a drive connection 37', which is provided for connection to a drive motor, such as, for example, an internal combustion engine of a motor vehicle.
  • the drive connection 37 ' is the lid 1', 2 ', 3' facing away.
  • the drive connection 37 ' is at least rotatably connected to a drive shaft.
  • the rotary pump can also be driven by means of an electric motor.
  • the rotor 9 ' For storage, the rotor 9 'has a bearing section 41', which is mounted in the delivery chamber housing 8 '.
  • the drive connection 37 ' is formed in the bearing portion 41'.
  • the cover 1 ', 2', 3 ' has a first valve cover 1' with two elastically deformable or elastically yielding regions 13 ', 14', which are movable relative to the delivery chamber housing 8 'by the pressure prevailing in the delivery chamber 10' fluid pressure, in order to be able to widen the sealing gap to a relief gap through which fluid located in the delivery chamber 10 'can escape into the environment of the rotary pump.
  • the first valve cover 1 ' In contrast to the previous embodiment, the first valve cover 1 'only a valve opening 12'.
  • the valve port 12 ' is provided to form an exhaust valve.
  • the first valve cover 1 ' in contrast to the previous embodiment has a multilayer structure. He has to provide the necessary rigidity and thus the formation of a cold-start valve and a return valve several cover layers or Cover plates, which are arranged on top of each other. The cover layer or cover plate contacting the delivery chamber housing 8 'forms the second sealing surface 36'.
  • the cover 1 ', 2', 3 'further has a second valve cover 2' which, depending on the fluid pressure prevailing in the delivery chamber 10 ', opens or closes the valve opening 12' of the first valve cover 1 '.
  • the second valve cover 2 ' has an elastically deformable or elastically yielding region 22', which is movable relative to the first valve cover 1 'by the fluid pressure prevailing in the delivery chamber 10' in order to open the valve opening 12 'of the first valve cover 1'. whereby the fluid in the delivery chamber 10 'can escape into the environment U of the rotary pump.
  • the elastically deformable or elastically yielding region 22 'of the second valve cover 2' is formed like a tongue.
  • the second valve cover 2 'further comprises two elastically deformable or elastically yielding regions 23', 24 ', which complicate the elastic deformation or elastic yielding of the first valve cover 1'.
  • the lid 1 ', 2', 3 'further comprises a stopper lid 3', which forms a stop 32 ', 33' for the two valve covers 1 ', 2'.
  • FIG. 5 is a third embodiment of a rotary pump with a delivery chamber 10 "having an inlet for a fluid on a suction side and an outlet for the fluid on a pressure side, in the delivery chamber 10" arranged rotor 9 ", a delivery chamber housing 8", the one The first sealing surface 35 “and an” several valves forming cover 1 “, 2", 3 “, which has a second sealing surface 36" shown in an exploded view
  • the delivery chamber housing 8 "and the lid 1", 2 “, 3” lie with the sealing surfaces 35 ", 36” to one another and together form a sealing joint surrounding the delivery chamber 10 "to seal the delivery chamber 10.
  • the rotor 9" has a drive connection 37 ". on, which is mounted in the delivery chamber housing 8 ".
  • the cover 1 ", 2", 3 has a first valve cover 1" with two elastically deformable or elastically yielding regions 13 ", 14" which are relative to the delivery chamber housing 8 are movable by the fluid pressure prevailing in the delivery chamber 10 in order to be able to widen the sealing joint to a relief gap, through which fluid located in the delivery chamber 10 "can escape into the environment of the rotary pump.
  • the first valve cover 1 "forms the second sealing surface 36" and has only one valve opening 12 ".
  • the cover 1 ", 2", 3 " also has a second valve cover 2", which opens or closes the valve opening 12 "of the first valve cover 1" as a function of the fluid pressure prevailing in the delivery chamber 10.
  • the second valve cover 2 has a elastically deformable or elastically yielding region 22 "movable relative to the first valve cover 1" by the fluid pressure prevailing in the delivery chamber 10 "to open the valve opening 12" of the first valve cover 1 ", whereby the flow in the delivery chamber 10" located fluid can escape into the environment of the rotary pump.
  • the first valve cover 1 compared to the second valve cover 2" on a higher rigidity.
  • the first valve cover 1 has a greater material thickness than the second valve cover 2".
  • the second valve cover 2 also has two elastically deformable or elastically yielding regions 23", 24 ", which complicate the elastic deformation or elastic yielding of the first valve cover 1".
  • the cover 1 ", 2", 3 "further comprises a stopper cover 3", which forms a stop 32 ", 33" for the two valve covers 1 ", 2".
  • the rotary pump of the third embodiment is shown in a longitudinal section.
  • the rotary pump is shown with the exhaust valve open.
  • the rotary pump is shown with the cold start valve open.
  • the rotary pump is shown with the return valve open.
  • FIG. 13 For example, there is shown a lid 1 "', 2'", 3 '"and a rotor 9'" of a rotary pump in a fourth embodiment.
  • the cover 1 "', 2"', 3 '” has a first valve cover 1'" with two elastically deformable or elastically yielding regions 13 "'. , 14 '”and a valve opening 12'" on.
  • the cover 1 "', 2'", 3 '"a second valve cover 2' which opens or closes the valve opening 12 '"of the first valve cover 1'".
  • the second valve cover 2 '" has an elastically deformable or elastically compliant portion 22'" which is movable relative to the first valve cover 1 '"to open the valve opening 12'" of the first valve cover 1 '"'' has two elastically deformable or elastically yielding portions 23 '', 24 ''', which complicate the elastic deformation or elastic yielding of the first valve cover 1'.
  • the lid 1'',2'',3'''' further a stopper cover 3 '"on, which forms a stop 32'", 33 '"for the two valve cover 1'", 2 '".
  • the cover 1 "', 2'", 3 '" has a bearing function in addition to its sealing function and its valve function.
  • the cover 1'", 2 '", 3'" has an opening 38 '" for the rotor 9 '"on.
  • the rotor 9 '" is mounted in the opening 9'" on the cover 1 '", 2'", 3 '", for which purpose the rotor 9'" has a bearing section 40 '"which is located in the cover 1"', 2 '", 3'" is stored.
  • the opening 38 '" is formed as a through-opening and extends axially through the entire cover 1'", 2 '", 3'".
  • the first valve cover 1'", the second valve cover 2 '"and the stopper cover 3'" each have an opening which overlap at least partially.
  • the stopper cover 3'" in comparison to the previous embodiments, a greater material thickness or material thickness.
  • the rotor 9 '" has a drive connection 37'", which is provided for connection to a drive motor, such as, for example, to an internal combustion engine of a motor vehicle.
  • the drive connection 37 '" is designed or arranged on the cover side.
  • the rotor 9'" engages through the device for connection to the drive motor Opening 38 '"and protrudes with its drive connection 37'" axially out of the cover 1 '", 2'", 3 '"out.
  • the rotary pump is driven by the drive connection 37'".
  • the drive connection 37 '" is formed on the bearing portion 40'".
  • the drive connection 37 '" is designed as a drive wheel connection, on the drive connection 37'" is an unillustrated drive wheel, for example a sprocket or a pulley, fixedly arranged, for example, pressed.
  • the rotor 9 '"" a toothing 39' ", which is provided for driving a further shaft, for example a pump shaft.
  • the rotary pump with the lid 1 '", 2'", 3 '"and the rotor 9'” is a pump of a pump unit or tandem pump consisting of two pumps.
  • the pump unit comprises the rotary pump with the cover 1 "', 2'", 3 '"and the rotor 9'", which is designed for example as a vacuum pump, and a lubricating and / or coolant pump, which is designed for example as a lubricating oil pump , on.
  • the delivery chamber housing of the rotary pump may integrally form at least part of a housing of the pump unit or the tandem pump.
  • the rotor 9 '" is thus mounted on the cover 1'", 2 '", 3"' of the rotary pump and on the delivery chamber housing the rotary pump.
  • the rotor 9 '" has no toothing 39'", in particular when the rotary pump with the cover 1 "', 2'", 3 '"and the rotor 9'” is not assigned to a pumping unit or tandem pump , Furthermore, it is conceivable in principle that the rotor 9 '"has no further bearing section 40'", whereby the rotor 9 '"" only on the lid 1 "', 2 '", 3'"is mounted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP18199617.4A 2017-10-11 2018-10-10 Pompe rotative Withdrawn EP3470624A1 (fr)

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Application Number Priority Date Filing Date Title
DE102017123695.3A DE102017123695A1 (de) 2017-10-11 2017-10-11 Rotationspumpe

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EP3470624A1 true EP3470624A1 (fr) 2019-04-17

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015942A1 (de) * 1980-04-25 1981-10-29 Volkswagenwerk Ag, 3180 Wolfsburg Mit einem oeldruckregelventil ausgeruestete oelpumpe
DE102007018247A1 (de) * 2007-04-12 2008-10-16 Joma-Hydromechanic Gmbh Vakuumpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203686A (en) * 1991-11-04 1993-04-20 General Electric Company Rotary compressor with span type discharge valve
US7018183B2 (en) * 2002-09-23 2006-03-28 Tecumseh Products Company Compressor having discharge valve
WO2004044431A2 (fr) * 2002-11-13 2004-05-27 Luk Automobiltechnik Gmbh & Co. Kg Pompe a vide
JP2013147973A (ja) * 2012-01-18 2013-08-01 Mitsubishi Electric Corp 圧縮機及び冷凍サイクル装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015942A1 (de) * 1980-04-25 1981-10-29 Volkswagenwerk Ag, 3180 Wolfsburg Mit einem oeldruckregelventil ausgeruestete oelpumpe
DE102007018247A1 (de) * 2007-04-12 2008-10-16 Joma-Hydromechanic Gmbh Vakuumpumpe

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