EP2743506B1 - Pompe à gaz dotée d'une rainure à huile d'étanchéification - Google Patents

Pompe à gaz dotée d'une rainure à huile d'étanchéification Download PDF

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Publication number
EP2743506B1
EP2743506B1 EP13196532.9A EP13196532A EP2743506B1 EP 2743506 B1 EP2743506 B1 EP 2743506B1 EP 13196532 A EP13196532 A EP 13196532A EP 2743506 B1 EP2743506 B1 EP 2743506B1
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EP
European Patent Office
Prior art keywords
liquid
pump
sealing
gas pump
delivery chamber
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.)
Active
Application number
EP13196532.9A
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German (de)
English (en)
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EP2743506A3 (fr
EP2743506A2 (fr
Inventor
Jürgen Bohner
Sven Peters
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
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Publication of EP2743506A2 publication Critical patent/EP2743506A2/fr
Publication of EP2743506A3 publication Critical patent/EP2743506A3/fr
Application granted granted Critical
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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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/356—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • 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
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/025—Lubrication; Lubricant separation using a lubricant pump
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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

Definitions

  • the invention relates to the sealing of a gas pump, in particular a vacuum pump.
  • Vacuum pumps as the invention relates in particular, are used in vehicles, for example, to provide negative pressure for a brake booster.
  • the pump can be arranged laterally on the cylinder head of a vehicle engine and driven by a camshaft, as was customary for a long time. Due to space restrictions and also to reduce the specific size of the vacuum pump is recently arranged in tandem with a lubricating oil pump in the oil sump. Because of relatively high demands on the tightness, it has been customary to seal by means of O-ring or profile seal. The seal should prevent air from being sucked in from the environment. In addition, when mounted on the outside of the engine pumps, oil leakage should be prevented. When installed in the oil sump, an absolute oil-tightness of the system to the outside is no longer absolutely necessary. The seal is used practically only to avoid the Heilsaugens.
  • the sealing elements such as O-ring and profile form seals, are manufactured separately and placed in a surrounding the delivery chamber sealing groove of a housing part of the gas pump or placed on an end face of the housing part. For assembly and assembly, they are secured to the housing part.
  • the sealing elements cause costs that can no longer be neglected, especially in mass production, as is customary in vehicle production. Seen over the life of the pump also suffers the tightness due to material degradation of the sealing elements.
  • Gas pumps which are preferably designed as vane pumps as disclosed by the invention, disclose, for example, the US 2012/0060683 A , the US 3,326,456 A and the WO 2007/003215 A1 ,
  • the US 3 791 780 A. relates to a multi-stage vacuum pump in which individual pumping stages are sealed against each other by grooves filled with oil.
  • the sealing oil is provided by an oil reservoir located above the pumping chambers.
  • the US Pat. No. 3,982,864 relates to a vacuum pump in which abutting parts of the Pump chamber are processed so that the pump chamber is sealed by a lubricating layer which remains between the parts, and not as in the prior art is displaced during assembly of the pump.
  • the pump further includes a sealing groove filled with oil to assist in sealing the pump chamber.
  • the US 2010/226808 A1 relates to a multi-stage vacuum pump for use in a clean environment, such as semiconductor manufacturing.
  • the vacuum pump includes conventional sealing elements for sealing the pump chamber and oil seals for protecting the seals from the environment.
  • the DE 10 2011 054887 A1 relates to a vacuum pump which is driven by means of a hydraulic medium, such as engine oil. That the engine oil can also be used to seal the pump chamber of the vacuum pump is not known from the document.
  • the DE 10 210 030389 A1 relates to a high-pressure fuel pump with attached vacuum pump.
  • the invention is based on a gas pump which has a first housing part with a sealing surface and a second housing part likewise with a sealing surface, furthermore a delivery chamber with an inlet and an outlet for a gas and a delivery device movable in the delivery chamber for conveying the gas.
  • the two housing parts alone can form the delivery chamber with one another, in particular completely enclosing the delivery chamber apart from one or more inlets and one or more outlets.
  • the first housing part and the second housing part may enclose the delivery chamber together with one or more further housing parts of the gas pump.
  • One of the two housing parts, for example the second housing part may in particular be a housing cover which closes off the delivery chamber at one end face.
  • the housing parts are joined together, so that they at least partially, preferably completely enclose the delivery chamber over a chamber circumference and with the said sealing surfaces to form a sealing joint to each other to seal the delivery chamber.
  • the sealing surfaces are preferably pressed against each other, for example by the housing parts are joined together by means of screw.
  • a sealing recess which is filled during operation of the gas pump with a sealing liquid.
  • the sealing recess is completely filled with the sealing liquid.
  • the degree of filling of the sealing recess is at least so great that by the located in the sealing recess Sealant sealing the delivery chamber is guaranteed to the extent necessary for practical purposes.
  • the sealing recess is filled only with the sealing liquid. In any case, the sealing liquid in the sealing recess ensures the tightness of the delivery chamber over the sealing joint of the sealing surfaces.
  • the sealing recess may extend continuously over the entire circumference of the delivery chamber, i. over 360 °. In modifications, it may be locally interrupted at one or more locations over its circumference. In principle, it may also extend over only a part of the circumference, but in such embodiments preferably over the greater part of the circumference. It should also not be ruled out that the housing part, in which the sealing recess is provided, extends only over part of the circumference of the delivery chamber.
  • a sealing recess is formed, preferably in such a way that the in the plurality of housing parts provided sealing recesses together the delivery chamber over its entire circumference continuously surrounded, so merge into one another or connect to each other without interruption. Modifications in the above sense, however, are possible in such embodiments.
  • the sealing recess is delimited both along an inner edge facing the delivery chamber and along an outer edge facing away from the delivery chamber from the sealing surface in which the sealing depression is formed.
  • the sealing recess is formed in other words in an end view of the sealing surface seen within the sealing surface, but this does not preclude that this sealing recess is in places with an inner or an outer edge of the sealing surface in connection, for example via one or more of the sealing recess inwards or outside branching, groove-shaped channel or channels.
  • Such a channel can for example serve to supply the sealing liquid into the sealing recess.
  • the previously separately manufactured sealing ring can be saved, the assembly of the gas pump can be simplified and consequently costs can be reduced.
  • the sealing groove is usually machined. Machining can be dispensed with sealing depression according to the invention.
  • the sealing recess can be formed directly in a primary molding, for example, a casting, or subsequently formed by embossing, thereby increasing the manufacturing costs again let reduce. Due to the reduction in parts also reduces the logistics and testing costs in the parts production and installation of the gas pump.
  • the gas pump is designed as a vacuum pump and is used to supply one or more units of a motor vehicle, with negative pressure or is provided for such use.
  • One application to which the invention is directed is that of a vacuum pump for supplying a brake booster or other engine of a motor vehicle with negative pressure.
  • the gas pump can be designed as a rotary pump.
  • the conveyor as a whole may be rotatable in the delivery chamber about an axis of rotation or comprise at least one in the delivery chamber about a rotation axis rotatable conveyor member.
  • the conveyor may also include a plurality of rotatable conveyor members rotatable about spaced apart axes of rotation.
  • the gas pump may be a vane pump and the delivery device may comprise one or more delivery rotors, each having a single or multiple vanes.
  • the sealing recess is connected via a supply to a reservoir or a circuit of the sealing liquid, so that the sealing liquid of the sealing recess can be supplied in the assembled state of the housing parts.
  • the sealing recess may also be tightly closed without the possibility of supplying sealing liquid.
  • the connection of the sealing depression to a reservoir or a circulation has the advantage that the sealing depression can also be supplied subsequently, ie after the assembly of the gas pump, sealing liquid, for example for initial or repeated filling of the sealing depression or for compensation from the sealing joint or by an optional local discharge from the sealing recess compressed sealing liquid.
  • the sealing liquid may be a liquid which is used in the vicinity of the gas pump for a different purpose, for example as a working liquid, such as a hydraulic oil, another unit.
  • a liquid lubricant forms the sealing liquid.
  • This may be the same lubricant that also serves to lubricate the conveyor and / or seal conveyor cells formed in the delivery chamber. If the gas pump is assigned to an internal combustion engine of a motor vehicle, aircraft or watercraft, in particular a lubricant serving for lubricating the internal combustion engine can also form the sealing fluid in a further function.
  • the sealing liquid can advantageously serve for the lubrication of the conveying device and / or sealing purposes, for example the sealing, optionally within the conveying chamber of formed conveying cells.
  • a connection may exist between the sealing recess and the delivery chamber, such that lubricant initially serving as sealant in the sealing recess can penetrate from the sealing depression into the delivery chamber.
  • one or more local connections or discharges provided in the region of the sealing joint between the sealing recess and the delivery chamber or the entire region of the sealing joint, which is located between the sealing recess and the delivery chamber be performed evenly with a certain leakage to a small Allow flow of sealing liquid, respectively lubricant, from the sealing recess into the delivery chamber.
  • Such a flow in the direction of the delivery chamber is favored in embodiments in which the gas pump is a vacuum pump, as is preferred, because of the negative pressure prevailing in the delivery chamber during operation of the gas pump.
  • the invention also relates to a combination of the gas pump with a liquid pump, which serves to supply an aggregate with a liquid, such as a working fluid or a liquid lubricant, said liquid also forms the sealing liquid for the gas pump in a further function.
  • the liquid pump may in particular be a lubricant pump for supply Serve an internal combustion engine or other aggregate with liquid lubricant.
  • the liquid pump has a delivery chamber and the delivery chamber has an inlet on a low-pressure side of the liquid pump and an outlet for the liquid on a high-pressure side of the liquid pump.
  • the liquid pump further has a drivable conveying device, which can perform a conveying movement in a drive in the delivery chamber, through which the liquid is conveyed from the inlet to the outlet of the delivery chamber.
  • the inlet may be an inlet of the liquid pump upstream of the delivery chamber or an inlet directly into the delivery chamber.
  • the outlet may be an outlet directly of the delivery chamber or an outlet of the fluid pump downstream of the delivery chamber.
  • the liquid pump has a housing part which forms one or more chamber walls of the delivery chamber of the liquid pump.
  • One of the housing parts of the gas pump can simultaneously also form this housing part of the liquid pump.
  • the housing part in question may in particular have the sealing surface with the sealing recess for sealing the delivery chamber of the gas pump.
  • the gas pump and the liquid pump are rotary pumps, so that the conveying device of the gas pump and also the conveying device of the liquid pump each have at least one conveying member rotatable about an axis of rotation, it is also advantageous if these conveying members are rotatably mounted about a common axis of rotation.
  • the at least two rotatable conveyor members may basically surround each other, more preferably they are coaxially juxtaposed.
  • the at least one rotatable conveying member of the gas pump and the at least one rotatable conveying member of the liquid pump may be rotatable relative to each other, in preferred embodiments, however, they are rotatably connected to each other. They are preferably driven together via a drive wheel. They can be coupled by means of a transmission.
  • these conveyor members can be joined to the common shaft each torque. It may also be one of the conveying members, either a conveying rotor of the gas pump or a conveying rotor of the liquid pump, formed with the shaft in one piece and only the other conveying rotor with the shaft rotatably connected.
  • the shaft forms both a conveying rotor of the gas pump and a conveying rotor of the liquid pump in one piece, although in many embodiments this will only be possible with a housing divided in the axial direction.
  • the feed can branch off in first embodiments on the high pressure side of the liquid pump, so that liquid conveyed by the liquid pump from the high pressure side into the sealing recess can get.
  • the invention is that part of the system which extends from the high pressure side of the fluid pump delivery chamber to a most downstream point of the system to be supplied by the fluid pump with the fluid.
  • the feed for the sealing depression may in principle branch off directly on the high-pressure side of the delivery chamber of the liquid pump, more preferably the supply branches off downstream of the delivery chamber.
  • the supply for the sealing depression advantageously branches off downstream of the filter device. It is advantageous if the feed branches off upstream of the unit to be supplied with the liquid, preferably upstream of a first point in the system, which is to be supplied with the liquid, in the flow path to the filter means.
  • the purer the liquid that is fed to the sealing depression the more favorable the conditions, in particular in embodiments in which the sealing liquid can pass from the sealing recess into the delivery chamber of the gas pump.
  • the supply branches off on the low-pressure side of the liquid pump.
  • the low pressure side of the liquid pump includes the portion of the liquid system upstream of the liquid pump.
  • the low pressure side of the liquid pump extends from the low pressure side of the delivery chamber to a location of the liquid system that is downstream of all the points of use of the liquid system and from which the liquid pump sucks the liquid. This is in most applications a liquid reservoir such as a liquid sump.
  • the supply branches off upstream of the delivery chamber of the liquid pump.
  • the supply can in particular branch off within a housing of the liquid pump.
  • the supply for the sealing recess may be located in this common housing or on the housing, so that an external connection with respect to the common housing for supplying the sealing recess is not required ,
  • the filter device in such embodiments is likewise arranged in or on the common housing of the pumps.
  • the surrounding liquid provides in the immersed peripheral region of the sealing joint for an additional outer seal, Particularly advantageous, when it is the surrounding liquid to the same liquid as the sealing liquid, an intrusion of surrounding liquid in the sealing depression thus has, to a certain extent, no negative effects.
  • Surrounding liquid can penetrate, for example, when the gas pump is used as a vacuum pump and the self-adjusting in the delivery chamber vacuum develops a reaching into the sealing joint suction.
  • the surrounding liquid is a lubricant for lubricating the conveyor and / or sealing the delivery chamber of the gas pump or in the Delivery chamber formed conveyor cells is suitable.
  • the invention relates not only to a gas pump with inventive liquid seal alone and a pump assembly in which the gas pump is combined with a liquid pump of the type described, preferably in a common housing.
  • the invention also relates to an internal combustion engine with a mounted gas pump or pump assembly of the type described and also a vehicle, preferably a motor vehicle, with an internal combustion engine with a mounted gas pump or pump assembly of the kind described.
  • the internal combustion engine may in particular form a drive motor of the vehicle.
  • FIG. 1 shows a pump assembly of a first embodiment in an isometric view of a gas pump 10 of the pump assembly.
  • a liquid pump 20 forms in this view a rear part of the pump assembly.
  • the pump assembly includes a housing 10 common to both pumps 10 and 20. Such arrangements of pumps are also referred to as a tandem arrangement.
  • the common housing comprises a housing part 1, the movable components of the pump assembly, in particular a conveyor of the gas pump 10 and a conveyor of the liquid pump 20, movably supports, and housing parts 2 and 27, of which the housing part 2 a cover of the gas pump 10 and the housing part 27th forms a lid of the liquid pump 20.
  • the housing part 1 is integrally molded, suitably cast in one piece. In principle, however, it can also be composed of several pieces instead.
  • the housing parts 2 and 27 are each formed in one piece and joined to the housing part 1, for example, as shown in each case by means of a screw connection.
  • the gas pump 10 and the liquid pump 20 are designed as rotary pumps.
  • the rotary pumps 10 and 20 are arranged coaxially along a common axis of rotation axially one behind the other.
  • the housing part 1 is arranged axially centrally.
  • the housing part 2 is arranged on the one axial end side and the housing part 27 on the other axial end side of the housing part 1.
  • the conveyor of the gas pump 10 comprises a rotatable about the rotation axis conveyor rotor 11 and a single wing 12.
  • the conveyor is correspondingly single-leaf.
  • the conveyor rotor 11 guides the wing 12 radially displaceable.
  • the housing part 1 forms in the region of the gas pump 10 a housing pot, which delimits a delivery chamber 3 on one of the liquid pump 20 axially facing end face and surrounds the circumference.
  • With rotary drive of the conveyor rotor 11 of the wing 12 runs in the delivery chamber 3 and divides the delivery chamber 3 in a delivery cell, which increases on a low pressure side of the gas pump 10, and a further delivery cell, which decreases on the high pressure side of the gas pump 10.
  • the gas pump 10 can be operated in particular as a vacuum or vacuum pump, for example, to supply a brake booster of a vehicle with negative pressure.
  • the brake booster or another or further vacuum unit of the vehicle is connected to the inlet 4 and the aspirated gas, preferably air, is discharged via the outlet 5 into the environment, for example into a crankcase of an internal combustion engine.
  • a lubricant serving to lubricate the conveyor 10 is also ejected through the outlet 5.
  • FIG. 1 shows the housing part 2 prior to assembly in a position in which the housing part 2 of the facing open end face of the housing part 1 is axially opposite and pressed to close the delivery chamber 3 only axially against the housing part 1 and must be firmly connected to this.
  • a groove-shaped sealing recess 9 is formed completely circumferentially around the delivery chamber 3.
  • a sealing ring is arranged in a shape according to comparable sealing depression, which is elastically pressed in the assembled state of the housing parts 1 and 2 and thereby ensures the required sealing of the sealing joint.
  • the sealing joint between the sealing surfaces 6 and 7 is ensured by a sealing liquid located in the sealing recess 9.
  • the sealing recess 9 is filled at least in pump operation with the sealing liquid.
  • An elastic sealing ring or other sealing element is not required for sealing the sealing joint 6, 7.
  • the housing part 1 has a sealing recess 9 for the sealing liquid.
  • a Sealing recess corresponding to the sealing recess 9 instead be provided only in the sealing surface 7 of the housing part 2.
  • FIG. 2 shows the pump assembly of the first embodiment in an axial view of the gas pump 10.
  • the housing part 2 is joined to the housing part 1, but shown cut in a partial area, so that in this part of the area covered by the housing part 2 in the remaining area sealing surface 6 and sealing recess. 9 are visible.
  • the sealing recess 9 is not encapsulated, but connected via a feed with a system, can be guided from the sealing liquid into the sealing recess 9. From the supply sections 15 and 16 can be seen, which connect the sealing recess 9 with an inlet 14 for the sealing liquid.
  • the inlet 14 is provided in the housing part 1. When assembling the pump assembly, for example on an internal combustion engine, the inlet 14 is connected to a fluid system leading the sealing liquid.
  • the feed 14, 15 and 16 is sealed at the end face of the housing part 1 by the housing part 2 simultaneously with the sealing recess 9.
  • the formation of the feed sections 15 and 16 as open to the front side sections facilitates the preparation of the feed 14, 15 and 16.
  • the section 15 opens radially adjacent to the sealing recess 9 and is connected via the opening 16 open to the front side with the sealing recess 9.
  • the section 15 may be formed in particular as an axial bore. An oblique hole or another course would be instead also feasible.
  • FIG. 3 shows the pump assembly of the first embodiment in an isometric view of the liquid pump 20.
  • the liquid pump 20 is like the gas pump 10 of the vane type.
  • the liquid pump 20 comprises a multi-leaf conveyor with a rotatable about the common axis of rotation with the gas pump 10 conveyor rotor 21 and a plurality of distributed over the circumference of the conveyor rotor 21 arranged wings 22.
  • the liquid pump 20 is in relation to their specific Delivery volume adjustable. It comprises an adjusting ring 23, which is mounted pivotably relative to the housing part 1 in order to be able to adjust an eccentricity of the conveyor 21, 22 and thereby the specific delivery volume of the liquid pump 20.
  • a restoring spring 26 exerts on the adjusting ring 23 a restoring force acting in the direction of maximum delivery volume.
  • the adjusting ring 23 is acted upon counteracting this restoring force with the conveyed by the liquid pump 20 hydraulic fluid in the direction of a reduction of the specific delivery volume.
  • the vanes 22 divide a delivery chamber of the liquid pump 20 into delivery cells, which increase in rotational drive of the conveyor 21, 22 and eccentric position of the adjusting ring 23 relative to the axis of rotation on a low pressure side of the delivery chamber, whereby liquid is sucked into the delivery chamber, and on a high pressure side reduce the delivery chamber again, so that on the high pressure side through an outlet 25, the liquid is ejected under increased pressure.
  • the inlet region comprises an inlet 24 of the housing part 1, which in FIG. 1 is recognizable, and in the housing part 1 upstream of the feed chamber located inlet portion 24, in which the return spring 26 is arranged by way of example and from which a chamber inlet leads directly into the feed chamber.
  • the outlet region comprises the chamber outlet leading directly from the delivery chamber, furthermore an outlet section 25 formed in the housing part 1 and downstream of this an outlet 25 of the housing part 1.
  • the sealing liquid of the gas pump 10 can be, in particular, liquid lubricant, suitably the same lubricant with which the conveyor 11, 12 is lubricated and the delivery cells formed in the delivery chamber 3 of the gas pump 10 are sealed against each other.
  • a certain, albeit low permeability of the sealing joint 6, 7 may therefore be present or desired in the direction of the delivery chamber 3.
  • the sealing joint 6, 7 can be designed so that in operation of the gas pump 10 due to a pressure prevailing in use as a vacuum pump in the delivery chamber 3 negative pressure sealing liquid from the sealing recess 9 inside, in the delivery chamber 3 penetrates to the mentioned functions, namely the Lubrication of the conveyor 11, 12 and / or the sealing of the conveyor cells and / or cooling, to work in conjunction with otherwise supplied lubricant.
  • the liquid pump 20 may in particular be a lubricant pump for supplying an aggregate with a liquid lubricant.
  • the liquid pump 20 is a lubricant pump for supplying an internal combustion engine, preferably a drive motor of a vehicle, with liquid lubricant.
  • the sealing liquid for sealing the gas pump is the liquid which is conveyed by means of the liquid pump 20.
  • the supply 14, 15 and 16 is connected to the fluid system formed by means of the liquid pump 20.
  • the sealing recess 9 is connected via the feed 14, 15 and 16 to the high pressure side of the liquid pump 20, so that the liquid pump 20 promotes the sealing liquid via the feed 14, 15 and 16 with pressure in the recess 9.
  • the sealing recess 9 can be connected, in particular, at a point between the filter device and the unit to be supplied, by placing in the flow path of the liquid between the filter device and the unit to be supplied branches off a further feed section which connects the fluid system to the inlet 14 of the feeders 14, 15 and 16.
  • the liquid is a lubricant and the gas pump 10 is not lubricated or at least not exclusively lubricated with liquid from the sealing recess 9 and / or sealed
  • the same inlet 14 can also serve the lubricant required for the lubrication and sealing, bypassing the Sealing groove 9 to lead in the gas pump 10.
  • the same liquid can be used as a control pressure fluid for adjusting the specific delivery volume of the liquid pump 20 by the adjusting ring 23 of the Return spring 26 counteracting the liquid, advantageously purified liquid, is acted upon.
  • the pump assembly is rotationally driven via a drive wheel 13. If the pump arrangement is associated with an internal combustion engine, it can be driven, for example, by a crankshaft of the internal combustion engine via the drive wheel 13.
  • the drive wheel 13 can be part of a traction mechanism or of a gear transmission, in principle also of a friction gear.
  • the drive wheel 13 is mechanically coupled to both the conveyor 11, 12 so also with the conveyor 21, 22 and may be rotatably connected in particular with two conveyor rotors 11 and 21.
  • the pump assembly may be partially or wholly submerged in a sump or other type of reservoir of liquid, particularly a reservoir of liquid conveyed by the liquid pump 20.
  • the pump assembly may be arranged partially or wholly immersed in a lower region, for example on a lower side, an internal combustion engine, in the lubricant sump of the internal combustion engine.
  • the arrangement in a liquid reservoir, preferably a lubricant reservoir, is advantageous for the sealing of the gas pump. Due to the prevailing in the pumping operation in the delivery chamber 3 negative pressure can and may be sucked lubricant from the environment, the reservoir, via the sealing joint 6, 7 in the sealing recess 9 and from there into the delivery chamber 3.
  • the outside surrounding the gas pump lubricant which also serves as a sealing liquid, effectively prevents ambient air in the area surrounded by the lubricant via the sealing joint 6, 7 is sucked, whereby the tightness of the gas pump and thus their efficiency and flow rate can be improved.
  • Said filter device is external with respect to the pump arrangement. It may for example be integrated or mounted on the internal combustion engine.
  • the housing outlet 25 of the liquid pump 20 and the inlet 14 leading to the sealing recess 9 of the gas pump 10 are thus connected to one another via the internal combustion engine or a unit comprising the filter device and mounted on the internal combustion engine.
  • the sealing recess 9 but also on the feed sections 15 and 16 ( FIG. 2 ) or otherwise formed supply within the housing 1, 2, 27 of the pump assembly with the high-pressure side of the liquid pump 20 are in communication to supply the funded by the liquid pump 20 liquid of the sealing recess 9 as a sealing liquid.
  • FIGS. 4, 5 and 6 show a pump assembly of a second embodiment, which differs from the pump assembly of the first embodiment only with respect to the supply of the sealing liquid in the sealing recess 9.
  • the pump arrangement of the second embodiment is shown in an isometric view of the gas pump 10.
  • FIG. 5 shows the pump assembly in an axial view of the gas pump 10, wherein the housing part 2 is cut out in a partial region to release the view of the delivery chamber 3 and in particular on the sealing surface 6 and the recess 9 in this sub-area.
  • the Figures 1 and 2 of the first embodiment correspond to the FIGS. 4 and 5 the Figures 1 and 2 of the first embodiment.
  • the sealing recess 9 is connected to the low pressure side of the liquid pump 20 and is supplied via a formed in or on the housing 1, 2 and 27 feed 17 with the sealing liquid.
  • the feed 17 is formed in the embodiment in or on the housing part 1 and opens into the sealing surface 6, in which the sealing recess 9 as in the first embodiment to the delivery chamber 3 is formed completely encircling, In the assembled state of the housing parts 1 and 2, the supply 17th closed together with the sealing recess 9 of the sealing surface 7 of the housing part 2.
  • FIG. 5 shows the geometric conditions in the mouth region of the feed 17.
  • the feed 17 opens in the sealing surface 6 directly adjacent to the sealing recess 9 radially outward.
  • the housing part 1 is bulged to the outside in the region of the feed 17, in particular in the region of the sealing surface 6, in order to provide sufficient surface for sealing the sealing joint in the region of the feed 17 or its mouth.
  • FIG. 6 shows the pump assembly of the second embodiment in a longitudinal section, which includes common axis of rotation R for both pumps 10 and 20.
  • the pump arrangement can be seen in three parts with the central housing part 1 and the two housing parts 7 and 27 serving as the housing cover. It can also be seen that axially through the housing part 1, in the example also through the housing part 27, one around the Rotary axis R rotatable shaft extending, which forms the conveyor rotor 11 of the gas pump in one piece and on which the conveyor rotor 21 (FIG. FIG. 3 ) of the liquid pump 20 is arranged lubunbeweglich.
  • the drive wheel 13 is also rotatably connected to the shaft, so that by rotating driving the drive wheel 13, the shaft and, as a result, both conveyor rotors 11 and 21 are rotated together.
  • the housing part 1 forms a rotational sliding bearing for the shaft in a section located axially between the gas pump and the fluid pump.
  • the supply 17 extends through the housing part 1, in the second embodiment axially straight, and opens on the low pressure side of the liquid pump 20 in the inlet portion 24 of the inlet portion in which the return spring 26 is arranged.
  • the liquid drawn in by the liquid pump 20 is supplied as sealing liquid due to its inflow velocity or kinetic energy through the feed 17 to the sealing depression 9.
  • the gas pump 10 is operated as a vacuum pump and there is a connection between the sealing recess 9 and the delivery chamber 3, which allows a small flow of sealing liquid from the sealing recess 9 in the delivery chamber 3, such a suction effect can promote the promotion of the sealing liquid in the sealing recess 9 or possibly also alone effect only.
  • the feeder 17 advantageously branches off on the low-pressure side of the liquid pump 20 at a position which is georadically above the level of the liquid which sets when the liquid pump 20 is stationary. In view of the pump geometry of the embodiment, this means that the pump assembly is only partially immersed in compliance with this boundary condition in the liquid.
  • the pump arrangement of the second embodiment corresponds to that of the first embodiment, so that reference is made to the remarks on the other hand.
  • the housing parts 2 and 27 are each formed as a simple cover, which cover the delivery chamber 3 and the delivery chamber of the liquid pump 20 at each an open axial end side of the housing part 1.
  • the housing part 2 not only the front side, but also the peripheral wall of the delivery chamber 3 form.
  • the sealing joint 6, 7 would not be in such modifications as in the embodiments of the in FIG. 6 left end face of the delivery chamber 3, but at the right end of the delivery chamber 3 in the then formed there sealing surface of the modified housing part 2 or preferably in the then axially opposite sealing surface of the modified, namely shortened, housing part 1 is arranged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Reciprocating Pumps (AREA)

Claims (15)

  1. Pompe à gaz comportant :
    (a) une première partie de carter (1) ayant une surface d'étanchéité (6),
    (b) une seconde partie de carter (2) ayant une surface d'étanchéité (7),
    (c) une chambre de refoulement (3) ayant une entrée (4) et une sortie (5) pour un gaz,
    (d) et un dispositif de refoulement (11, 12) mobile dans la chambre de refoulement (3) pour refouler le gaz,
    (e) dans laquelle les parties de carter (1, 2) sont assemblées l'une à l'autre de sorte qu'elles entourent au moins en partie la chambre de refoulement (3) sur une circonférence de chambre et sont en butée contre les surfaces d'étanchéité (6, 7) afin étanchéifier la chambre de refoulement (3),
    (f) et dans laquelle un évidement d'étanchéité (9) s'étend dans au moins une des surfaces d'étanchéité (6, 7) autour de la chambre de refoulement (3), lequel évidement d'étanchéité est rempli d'un liquide d'étanchéité pendant le fonctionnement de la pompe à gaz,
    (g) dans laquelle la pompe à gaz est une pompe à vide pour générer une pression négative dans un ou plusieurs ensembles d'un véhicule automobile.
  2. Pompe à gaz selon la revendication 1, caractérisée en ce que l'évidement d'étanchéité (9) est raccordé à un réservoir ou à un circuit du liquide d'étanchéité par l'intermédiaire d'une alimentation (14, 15, 16 ; 17), de sorte que l'évidement d'étanchéité (9) peut être alimenté en liquide d'étanchéité.
  3. Pompe à gaz selon au moins une des revendications précédentes, caractérisée en ce qu'un lubrifiant liquide qui sert à lubrifier le dispositif de refoulement (11, 12) ou à étanchéifier des cellules de refoulement à l'intérieur de la chambre de refoulement (3), forme également le liquide d'étanchéité.
  4. Pompe à gaz selon la revendication précédente, caractérisée en ce qu'une alimentation (14, 15, 16 ; 17) pour le lubrifiant est reliée à l'évidement d'étanchéité (9) et/ou le lubrifiant servant de liquide d'étanchéité dans l'évidement d'étanchéité (9) peut pénétrer dans la chambre de refoulement (3) à partir de l'évidement d'étanchéité (9).
  5. Pompe à gaz selon au moins une des revendications précédentes, caractérisée en ce que une
    - une pompe à liquide (20) est prévue pour alimenter un ensemble avec un liquide qui forme également le liquide d'étanchéité,
    - la pompe à liquide (20) comporte une chambre de refoulement et un dispositif de refoulement (21, 22) mobile dans la chambre de refoulement et la chambre de refoulement comporte une entrée (24) sur un côté basse pression de la pompe à liquide et une sortie (25) sur un côté haute pression de la pompe à liquide, pour le liquide,
    - et une alimentation (14, 15, 16 ; 17) est prévue, qui relie l'évidement d'étanchéité (9) au côté basse pression ou au côté haute pression de la pompe à liquide (20), dans laquelle la pompe à liquide (20) est de préférence une pompe à lubrifiant et le liquide est de préférence un lubrifiant servant à lubrifier l'ensemble.
  6. Pompe à gaz selon la revendication précédente, caractérisée en ce que l'une des parties de carter (1, 2), de la pompe à gaz (10) forme une ou plusieurs parois de chambre, de préférence une paroi frontale et une paroi circonférentielle, de la chambre de refoulement de la pompe à liquide (20).
  7. Pompe à gaz selon l'une des deux revendications précédentes, caractérisée en ce que du côté haute pression de la pompe à liquide (20), de préférence en aval de la chambre de refoulement de la pompe à liquide (20), bifurque une alimentation (14, 15, 16) qui est reliée à l'évidement d'étanchéité (9) de sorte que du liquide refoulé par la pompe à liquide (20) peut parvenir dans l'évidement d'étanchéité (9) via l'alimentation (14, 15, 16).
  8. Pompe à gaz selon l'une des trois revendications précédentes, caractérisée en ce qu'en aval de la chambre de refoulement de la pompe à liquide (20), de préférence en amont de l'ensemble à alimenter, un dispositif filtrant est prévu pour nettoyer le liquide et l'alimentation (14, 15, 16) bifurque en aval du dispositif filtrant, de préférence en amont de l'ensemble.
  9. Pompe à gaz selon la revendication 5 ou 6, caractérisée en ce que du côté basse pression de la pompe à liquide (20) bifurque une alimentation (17) qui est reliée à l'évidement d'étanchéité (9) de sorte que du liquide aspiré par la pompe à liquide (20) peut parvenir dans l'évidement d'étanchéité (9).
  10. Pompe à gaz selon l'une des cinq revendications précédentes, caractérisée en ce que l'alimentation (17) bifurque à l'intérieur d'un carter (2, 27) de la pompe à liquide (20), de préférence du côté basse pression de la pompe à liquide (20) en amont de la chambre de refoulement de la pompe à liquide (20).
  11. Pompe à gaz selon l'une des revendications précédentes, caractérisée en ce que l'évidement d'étanchéité (9) peut être alimenté en liquide d'étanchéité via une alimentation (14, 15, 16 ; 17) qui bifurque à une bifurcation à partir d'un système d'alimentation pour alimenter un ensemble en liquide, et la bifurcation ou une partie de l'alimentation (14, 15, 16 ; 17) s'étendant entre la bifurcation et l'évidement d'étanchéité (9) se situe géodésiquement plus haute qu'un niveau de liquide qui s'établit dans le système d'alimentation lorsque la pompe à gaz (10) ou une pompe à liquide (20) servant facultativement à refouler le liquide dans le système d'alimentation est à l'arrêt.
  12. Pompe à gaz selon au moins une des revendications précédentes, caractérisée en ce que la pompe à gaz (10) est agencée au moins partiellement immergée dans le liquide, de préférence un lubrifiant liquide, et le liquide entoure au moins en partie les surfaces d'étanchéité (6, 7) sur un côté extérieur opposé à la chambre de refoulement (3) de la pompe à gaz (10).
  13. Pompe à gaz selon au moins une des revendications précédentes, caractérisée en ce que la pompe à gaz (10) est couplée à un moteur à combustion interne, de préférence est agencée sur le moteur à combustion interne ou est entraînée par le moteur à combustion interne, et un liquide lubrifiant servant à lubrifier le moteur à combustion interne forme le liquide d'étanchéité.
  14. Pompe à gaz selon au moins une des revendications précédentes, caractérisée en ce que le dispositif de refoulement (11, 12) de la pompe à gaz (10) et un dispositif de refoulement (21, 22) d'une pompe à liquide (20), de préférence la pompe à liquide (20) selon au moins une des revendications 6 à 11, est agencé de manière mobile, de préférence de manière rotative, dans un carter (1, 2, 27) incluant les parties de carter (1, 2), dans laquelle les dispositifs de refoulement (11, 12, 21, 22) peuvent de préférence tourner autour du même axe de rotation (R).
  15. Véhicule, de préférence un véhicule automobile, comportant :
    (a) un moteur à combustion interne,
    (b) une pompe à gaz (10) selon au moins une des revendications précédentes qui, pour son entraînement, est de préférence mécaniquement couplée au moteur à combustion interne,
    (c) un ensemble auquel peut être appliquée, au moyen de la pompe à gaz (10), une pression négative ou positive par rapport à la pression ambiante du véhicule automobile,
    (d) et un circuit de lubrifiant pour alimenter respectivement le moteur à combustion interne et la pompe à gaz (10) avec du lubrifiant liquide,
    (e) dans lequel l'évidement d'étanchéité (9) servant à étanchéifier la pompe à gaz (10) est raccordé au circuit de lubrifiant de sorte que le lubrifiant forme le liquide d'étanchéité.
EP13196532.9A 2012-12-11 2013-12-10 Pompe à gaz dotée d'une rainure à huile d'étanchéification Active EP2743506B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012222753.9A DE102012222753B4 (de) 2012-12-11 2012-12-11 Gaspumpe mit abdichtender Ölnut

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EP2743506A2 EP2743506A2 (fr) 2014-06-18
EP2743506A3 EP2743506A3 (fr) 2015-10-21
EP2743506B1 true EP2743506B1 (fr) 2018-04-04

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US (1) US9546658B2 (fr)
EP (1) EP2743506B1 (fr)
CN (1) CN103867442B (fr)
DE (1) DE102012222753B4 (fr)
TR (1) TR201809404T4 (fr)

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DE102013200410B4 (de) * 2013-01-14 2017-12-07 Schwäbische Hüttenwerke Automotive GmbH Gaspumpe mit Druckentlastung zur Reduzierung des Anfahrdrehmoments
DE102015109156B4 (de) 2015-06-10 2019-11-07 Schwäbische Hüttenwerke Automotive GmbH Pumpe mit Verstelleinrichtung und Steuerventil zur Verstellung des Fördervolumens der Pumpe
CN106014909B (zh) * 2016-05-18 2018-10-12 宁波圣龙汽车动力系统股份有限公司 双联泵
DE102017124193A1 (de) 2017-10-17 2019-04-18 Schwäbische Hüttenwerke Automotive GmbH Fluidpumpe mit einem Ventil
DE102017126750A1 (de) * 2017-11-14 2019-05-16 Schwäbische Hüttenwerke Automotive GmbH Pumpvorrichtung
DE102018105144A1 (de) * 2018-03-06 2019-09-12 Schwäbische Hüttenwerke Automotive GmbH Axiales Dichtelement Vakuumpumpe
DE102018105142A1 (de) * 2018-03-06 2019-09-12 Schwäbische Hüttenwerke Automotive GmbH Dichtelement Vakuumpumpe

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Also Published As

Publication number Publication date
CN103867442A (zh) 2014-06-18
EP2743506A3 (fr) 2015-10-21
US9546658B2 (en) 2017-01-17
EP2743506A2 (fr) 2014-06-18
CN103867442B (zh) 2017-09-15
US20140161645A1 (en) 2014-06-12
TR201809404T4 (tr) 2018-07-23
DE102012222753B4 (de) 2016-08-04
DE102012222753A1 (de) 2014-06-12

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