EP3507495B1 - Pompe à vide à vis - Google Patents

Pompe à vide à vis Download PDF

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Publication number
EP3507495B1
EP3507495B1 EP17751761.2A EP17751761A EP3507495B1 EP 3507495 B1 EP3507495 B1 EP 3507495B1 EP 17751761 A EP17751761 A EP 17751761A EP 3507495 B1 EP3507495 B1 EP 3507495B1
Authority
EP
European Patent Office
Prior art keywords
screw
pressure
vacuum pump
type vacuum
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17751761.2A
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German (de)
English (en)
Other versions
EP3507495A1 (fr
Inventor
Thomas Dreifert
Dirk Schiller
Wolfgang Giebmanns
Roland Müller
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.)
Leybold GmbH
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Leybold GmbH
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Filing date
Publication date
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Publication of EP3507495A1 publication Critical patent/EP3507495A1/fr
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Publication of EP3507495B1 publication Critical patent/EP3507495B1/fr
Active 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
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • 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
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C29/04—Heating; Cooling; Heat insulation
    • 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
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F04C2220/12—Dry running
    • 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
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/90—Alloys not otherwise provided for
    • F05C2201/903—Aluminium alloy, e.g. AlCuMgPb F34,37

Definitions

  • the invention relates to a screw vacuum pump.
  • Screw vacuum pumps have a pumping chamber in a housing, in which two screw rotors are arranged. Each screw rotor has at least one displacement element with a helical recess. As a result, a large number of turns are formed.
  • known screw vacuum pumps In order to be able to achieve low pressures or a high vacuum of in particular less than 200 mbar (absolute pressure) with a low specific power consumption with the aid of screw vacuum pumps, known screw vacuum pumps have a high internal compression. The internal compression defines the reduction of the delivery volume from the inlet to the outlet of the pump. Low outlet pressures are achieved, in particular, in that a gap with a small height is formed between an outside of the at least one displacement element and an inside of the scooping chamber.
  • EP 1 242 743 known to provide internal rotor cooling. With the help of the rotor internal cooling, an effective cooling of the rotor and thus of the at least one displacement element connected to the rotor or integrally formed therewith is ensured, so that small gap heights can be realized. Such an internal rotor cooling is structurally very complex and therefore expensive.
  • the object of the invention is to provide a screw vacuum pump with which a high vacuum of in particular less than 200 mbar and particularly preferably less than 10 mbar can be achieved, it being possible to dispense with internal rotor cooling.
  • the screw vacuum pump according to the invention has a housing which forms a scooping space in which the two screw rotors are arranged.
  • the housing and the rotors are made of aluminum or an aluminum alloy. Particularly preferred is the aluminum alloy for the housing AISi7Mg or AlMg0.75Si.
  • the coefficient of expansion of the material of the screw rotors is less than the coefficient of expansion of the material of the housing. It is particularly preferred that the expansion coefficient of the screw rotors is less than 22 * 10 -6 1 / K, particularly preferably less than 20 * 10 -6 1 / K.
  • the two screw rotors arranged in the scoop have at least one displacement element which has a helical recess.
  • the helical recesses form several turns.
  • this is at least one displacement element made of aluminum or an aluminum alloy. It is preferred to produce at least one displacement element made of AISi9Mg or AlSi17Cu4Mg. It is particularly preferred that the aluminum or the aluminum alloy has a low expansion coefficient of in particular less than 22 * 10 -6 1 / K, in particular less than 20 * 10 -6 1 / K.
  • the screw rotors and in particular the at least one displacement element per screw rotor have a lower expansion coefficient than the housing. It is particularly preferred here that the expansion coefficient of the housing is at least 5%, particularly preferably at least 10% larger than that of the screw rotors or of the at least one displacement element. It is particularly preferred that the alloy of the rotor has a high silicon content of preferably at least 9%, particularly preferably of more than 15%, in order to realize a low coefficient of thermal expansion.
  • the screw rotors and the at least one displacement element provided are designed such that at least 6, in particular at least 8 and particularly preferably at least 10 windings are provided between an area in which 5% to 20% of the outlet pressure prevails and the pressure-side rotor end.
  • the rotor end on the pressure side is the area of the pump outlet.
  • the high number of turns in this area according to the invention can be provided in a preferred embodiment in the case of a single pressure-side displacement element provided per rotor. However, it is also possible to provide a corresponding number of turns in this area on the pressure side, for example on two displacement elements.
  • the large number of turns means that a large surface is available for heat exchange with the housing.
  • the at least 6, in particular at least 8 and particularly preferably at least 10 windings are provided in a pressure-side displacement element.
  • the pressure ratio caused by the pressure-side displacement element is less than 20, in particular less than 10, and particularly preferably less than 5.
  • the last 6, in particular last 8 and particularly preferably last 10 windings in accordance with the invention result in a compression of 50 mbar to 1,000 mbar at a pressure ratio of 20.
  • a compression of 100 mbar occurs at a pressure ratio of 10 1,000 mbar and at a pressure ratio of 5 a compression from 200 mbar to 1,000 mbar.
  • the distance between an area in which 5% - 20% of the outlet pressure prevails, up to the last turn in the conveying direction, i.e. essentially up to the pump outlet is preferably at least 20% to 30% of the rotor length. This in turn has the advantage that in a relatively large area there is only a relatively low compression. This in turn causes a relatively small increase in temperature due to the low compression.
  • the pressure-side displacement element has at least 6, in particular at least 8 and particularly preferably at least 10 turns has an average working pressure of more than 50 mbar.
  • end pressure ie when the inlet is closed
  • a (time-averaged) pressure of 50 mbar is reached at this point of the pump.
  • a cold gap between the surface of the at least one displacement element and the inside of the scooping space in particular in the pressure-side area a height of 0.05 mm - 0.3 mm and in particular 0.1 mm - 0.2 mm.
  • Such a relatively large gap height can be provided on the basis of the configuration according to the invention described above, in particular 6, preferably 8 and particularly preferably 10 last windings.
  • Each displacement element has at least one helical recess which has the same contour over its entire length.
  • the contours are preferably different for each displacement element.
  • the individual displacement element thus has a constant contour and preferably a constant slope. This considerably simplifies the production, so that the production costs can be greatly reduced.
  • the contour of the displacement element on the suction side is preferably asymmetrical. Due to the asymmetrical design of the contour or profile, the flanks can be designed in such a way that the leakage areas, the so-called blowholes, in particular completely disappear or at least have a small cross section.
  • a particularly suitable asymmetrical profile is the so-called "Quimby profile”. Such a profile is relatively difficult to manufacture, has the advantage, however, that there is no continuous blow hole. A short circuit only exists between two neighboring chambers. Since it is an asymmetrical profile with different profile flanks, at least two work steps are required for the production, since the two flanks have to be produced in different work steps due to their asymmetry.
  • the pressure-side displacement element in particular the last displacement element in the pumping direction, is preferably provided with a symmetrical contour.
  • the symmetrical contour has the particular advantage that production is easier.
  • both flanks with a symmetrical contour can be produced in one work step by a rotating end mill or by a rotating side milling cutter.
  • Such symmetrical profiles have blowholes, they are continuous, i.e. not only provided between two adjacent chambers. The size of the blow hole decreases as the slope decreases.
  • such symmetrical profiles can be provided in particular in the case of the pressure-side displacement element, since in a preferred embodiment this has a smaller slope than the suction-side displacement element and preferably also as the displacement element arranged between the suction-side and the pressure-side displacement element.
  • the tightness of such symmetrical profiles is somewhat lower, they have the advantage that the manufacture is significantly easier.
  • a particularly suitable symmetrical profile is the so-called "cycloid profile".
  • the provision of at least two such displacement elements means that the corresponding screw vacuum pump can generate low inlet pressures with low power consumption.
  • the thermal load is also low.
  • the arrangement of at least two displacement elements designed according to the invention with constant pitch and constant Contour in a vacuum pump leads to essentially the same results as with a vacuum pump with a displacement element with changing pitch. With high built-in volume ratios, three or four displacement elements can be provided for each rotor.
  • a pressure-side, that is to say in particular the last, displacement element has a large number of turns. Due to the large number of turns, a larger gap between the screw rotor and the housing can be accepted while maintaining the same performance.
  • the gap can have a cold gap width of 0.05-0.3 mm.
  • a large number of outlet windings or number of windings in the pressure-side displacement element can be produced inexpensively, since, according to the invention, this displacement element has a constant pitch and preferably also a symmetrical contour. This enables simple and inexpensive production, so that the provision of a larger number of turns is acceptable.
  • This pressure-side or last displacement element preferably has more than 6, in particular more than 8 and particularly preferably more than 10 turns.
  • the use of symmetrical profiles has the advantage that both flanks of the profile can be cut simultaneously with one milling cutter.
  • the milling cutter is additionally supported by the opposite flank, so that deformation or bending of the milling cutter during the milling process and inaccuracies caused thereby are avoided.
  • the displacement elements and the rotor shaft are formed in one piece.
  • the change in pitch between adjacent displacement elements is discontinuous or erratic.
  • the two displacement elements are in the longitudinal direction arranged at a distance from each other so that a circumferential cylindrical ring-shaped chamber is formed between two displacement elements, which serves as a tool outlet. This is particularly advantageous in the case of rotors formed in one piece, since the tool producing the helical line can be led out in a simple manner in this area. If the displacement elements are manufactured independently of one another and then mounted on a shaft, the provision of a tool outlet, in particular of such a ring-cylindrical region, is not necessary.
  • no tool outlet is provided between two adjacent displacement elements on the change of pitch.
  • both flanks have a defect or recess in order to be able to lead the tool out.
  • Such a flaw has no significant influence on the compression performance of the pump, since it is a flaw or recess that is very local.
  • the vacuum pump screw rotor according to the invention has, in particular, a plurality of displacement elements. These can each have the same or different diameters. It is preferred here that the pressure-side displacement element has a smaller diameter than the suction-side displacement element.
  • displacement elements produced independently of the rotor shaft, these are mounted on the shaft by press fits, for example.
  • elements such as dowel pins for fixing the angular position of the displacement elements to one another.
  • the screw rotor In particular in the one-piece configuration of the screw rotor, but also in the case of a multi-piece configuration, it is preferred to produce it from aluminum or from an aluminum alloy. Particularly preferred is to manufacture the rotor from aluminum or an aluminum alloy, in particular AlSi9Mg or AlMg0.7Si.
  • the alloy preferably has a high silicon content of preferably more than 9%, in particular more than 15%, in order to reduce the coefficient of expansion.
  • the aluminum used for the rotors has a low coefficient of expansion. It is preferred if the material has an expansion coefficient of less than 22 * 10 -6 1 / K, in particular less than 20 * 10 -6 1 / K.
  • the surface of the displacement elements is coated, a coating against wear and / or corrosion being provided in particular. It is preferred to provide an anodic or other suitable coating depending on the area of application.
  • the screw rotor is made in one piece, in particular from aluminum or an aluminum alloy.
  • the screw rotor can also have a rotor shaft which carries the at least one displacement element. This has the advantage, in particular when providing a plurality of displacement elements, that these can be produced independently of one another and are subsequently connected to the rotor shaft in particular by being pressed on or shrunk on. It is possible to provide feather keys or the like to define the angular position of the individual displacement elements.
  • the rotor shaft can be made of steel and carry the at least one displacement element made of aluminum or an aluminum alloy.
  • the screw rotors have no internal rotor cooling.
  • the screw rotors have no channels through which liquid coolant flows.
  • the screw rotors can have bores or channels, for example for reducing weight, for balancing or the like. It is particularly preferred that the screw rotors are solid.
  • the pressure-side displacement elements i.e. in particular in the area of the last 6, preferably last 8 and particularly preferably last 10 windings, there is a small temperature difference between the displacement elements and the housing.
  • this temperature difference is preferably less than 50 K and in particular less than 20 K. Normal operation means the entire intake pressure range from the final pressure to an open inlet (atmospheric intake).
  • the housing in the area of the pressure-side displacement elements ie in particular in the area of the last 6, in particular last 8 and particularly preferably last 10 turns, has an average heat flow density which is less than 20,000 W / m 2 , preferably less than 15,000 W / m 2 and in particular less than 10,000 W / m 2 .
  • the average heat flow density is the ratio of the compression performance to the wall area of the outlet area.
  • the in the 1 and 2 Screw rotors shown can in a screw vacuum pump according to the invention, as in Fig. 5 shown, used.
  • the rotor has two displacement elements 10, 12.
  • a first displacement-side displacement element 10 has a large pitch of approximately 50-150 mm / revolution. The slope is constant over the entire displacement element 10. The contour of the helical recess is also constant.
  • the second pressure-side displacement element 12 again has a constant slope and a constant contour of the recess over its length. The slope of the pressure-side displacement element 12 is preferably in the range of 10-30 mm / revolution.
  • An annular cylindrical recess 14 is provided between the two displacement elements. This serves to ensure that due to the one-piece design of the in Fig. 1 shown screw rotor a tool outlet is realized.
  • the one-piece screw rotor has two bearing seats 16 and one shaft end 18.
  • a gearwheel for driving is connected to the shaft end 18, for example.
  • the two displacement elements 10, 12 manufactured separately and then fixed on a rotor shaft 20, for example by pressing.
  • the cylindrical distance 14 between two adjacent displacement elements 10, 12 is not required as a tool outlet.
  • the bearing seats 16 and the shaft ends 18 can be an integral part of the shaft 20.
  • the continuous shaft 20 can also be made of another material that differs from the displacement elements 10, 12.
  • Fig. 3 shows a schematic sectional view of an asymmetrical profile (eg a Quimby profile).
  • the asymmetrical profile shown is a so-called "Quimby profile”.
  • the sectional view shows two screw rotors which mesh with one another and whose longitudinal direction is perpendicular to the plane of the drawing. The opposite rotation of the rotors is indicated by the two arrows 15.
  • the profiles of the flanks 19 and 21 are designed differently for each rotor.
  • the mutually opposite flanks 19, 21 must therefore be produced independently of one another.
  • the production which is therefore somewhat more complex and difficult, has the advantage, however, that there is no continuous blow hole, but only a short circuit between two adjacent chambers.
  • Such an asymmetrical profile is preferably provided in the suction-side displacement element 10.
  • FIG. 4 The schematic sectional view in Fig. 4 again shows a cross section of two displacement elements or two screw rotors, which in turn rotate in opposite directions (arrows 15). Relative to the axis of symmetry 17, the flanks 23 are formed symmetrically for each displacement element.
  • the illustrated preferred embodiment of a symmetrically designed contour is a cycloid profile.
  • a symmetrical profile, as in Fig. 4 is preferably provided in the pressure-side displacement elements 12.
  • displacement elements are provided. If necessary, these can also have different head diameters and corresponding foot diameters. It is preferred here that a displacement element with a larger head diameter at the inlet, i.e. is arranged on the suction side in order to achieve a greater pumping speed in this area and / or to increase the built-in volume ratio. Combinations of the above-described embodiments are also possible. For example, one or more displacement elements can be produced in one piece with the shaft or an additional displacement element can be produced independently of the shaft and then mounted on the shaft.
  • FIG. 5 Shown schematic view of a preferred embodiment of a screw vacuum pump according to the invention are two screw rotors, as in Fig. 1 shown, arranged in a housing 26.
  • the vacuum pump housing 26 has an inlet 28 through which gas is drawn in in the direction of an arrow 30.
  • the inlet 28 is connected, for example, to a chamber to be evacuated.
  • the pump housing 26 has an outlet 32 on the pressure side, through which the gas is expelled in the direction of an arrow 38.
  • the screw vacuum pump according to the invention preferably pumps directly against the atmosphere, so that no forevacuum pump is connected to the outlet 32, although this is also possible.
  • the two pressure-side displacement elements 12 have 10 turns per screw rotor.
  • there is an area 40 i.e. in a region of the first turn of the pressure-side displacement element 12 in the conveying direction, a pressure of 5% - 20% of the pressure prevailing at the outlet 32.
  • a gap is formed between the surfaces 42 of the two pressure-side displacement elements 12 and an inner surface 44 of a scooping space 46 formed by the pump housing 26, the height of which is preferably in the range from 0.05 mm to 0.3 mm and in particular in the range from 0.1 mm - 0.2 mm.
  • the vacuum pump housing 26 is closed in the illustrated embodiment with two housing covers 47.
  • the in Fig. 4 left housing cover 47 has two bearing receptacles, in each of which a ball bearing 48 is arranged for mounting the two rotor shafts.
  • a ball bearing 48 is arranged for mounting the two rotor shafts.
  • the pins 50 of the two screw rotor shafts protrude through the covers 47.
  • a gear wheel 52 is arranged on each of the two shaft journals 50.
  • the two gear wheels 52 mesh with one another in order to synchronize the two screw rotors with one another.
  • two bearings 48 arranged for storing the screw rotors.
  • Housing material AlSi7Mg (cast, expansion coefficient 22 ⁇ 10 -6 K -1 or AlMg0.7Si (extrusion, expansion coefficient 23 ⁇ 10 -6 K -1 )
  • Material rotor AlSi9Mg (cast iron, coefficient of expansion 21 ⁇ 10 -6 K -1 ) or AlSi17Cu4Mg (cast iron, coefficient of expansion 18 ⁇ 10 -6 K -1 )
  • Silicon content rotor at least 9%, particularly preferably more than 15%
  • Coefficient of thermal expansion Housing / rotor at least 5% larger, particularly preferably 10% larger
  • Intermediate pressure between the suction-side and the pressure-side displacement element :

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)

Claims (15)

  1. Pompe à vide à vis dotée
    d'un boîtier (26) réalisant une chambre d'aspiration, dans laquelle le boîtier (26) est fabriqué en aluminium ou en un alliage d'aluminium, de deux rotors à vis agencés dans la chambre d'aspiration (46), dotés respectivement d'au moins un élément de déplacement (10, 12) comportant un évidement hélicoïdal permettant de réaliser plusieurs enroulements, dans laquelle l'au moins un élément de déplacement (10, 12) est fabriqué en aluminium ou en un alliage d'aluminium,
    caractérisée en ce que
    lorsque règne une pression d'aspiration inférieure à 200 mbar (pression absolue), au moins six, en particulier au moins huit et tout particulièrement au moins dix enroulements sont prévus entre la zone où règne 5 % à 20 % de la pression de sortie et une extrémité côté pression de rotor (sortie de pompe) et en ce que
    l'un élément de déplacement est réalisé comme élément de déplacement côté pression (12) et au moins un élément de déplacement supplémentaire (10) est prévu par rotor à vis, dans laquelle les évidements des éléments de déplacement (10, 12) présentent respectivement le même contour sur la totalité de leur longueur.
  2. Pompe à vide à vis selon la revendication 1, caractérisée en ce que l'élément de déplacement côté pression (12) crée un rapport de pression inférieur à 20, en particulier inférieur à 10 et tout particulièrement inférieur à 5.
  3. Pompe à vide à vis selon la revendication 1 ou 2, caractérisée en ce que l'élément de déplacement côté pression (12) présente sur au moins 6, en particulier au moins 8 et tout particulièrement au moins 10 enroulements une pression de travail moyenne supérieure à 50 mbar.
  4. Pompe à vide à vis selon l'une des revendications 1 à 3, caractérisée en ce qu'une fente avec une hauteur de 0,05 mm à 0,3 mm, en particulier 0,05 mm à 0,2 mm, est réalisée entre une surface supérieure (42) de l'élément de déplacement (12) et une surface interne (44) de la chambre d'aspiration (46).
  5. Pompe à vide à vis selon l'une des revendications 1 à 4, caractérisée en ce que les éléments de déplacement côté pression (12) présentent une pente constante sur la totalité de leur longueur et/ou sont réalisés à un filet.
  6. Pompe à vide à vis selon l'une des revendications 1 à 5, caractérisée en ce que les évidements des éléments de déplacement côté pression (12) présentent sur la totalité de leur longueur un contour symétrique constant.
  7. Pompe à vide à vis selon l'une des revendications 1 à 6, caractérisée en ce que chaque rotor à vis comporte un arbre de rotor portant les au moins deux éléments de déplacement (10, 12).
  8. Pompe à vide à vis selon l'une des revendications 1 à 7, caractérisée en ce qu'un rotor à vis fabriqué en aluminium ou en un alliage d'aluminium présente un coefficient de dilatation réduit et en particulier inférieur à 22*10-6 1/K et tout particulièrement inférieur à 20*10-6 1/K.
  9. Pompe à vide à vis selon l'une des revendications 1 à 8, caractérisée en ce que les rotors à vis et en particulier l'au moins un élément de déplacement (10, 12) par rotor à vis présente un coefficient de dilatation plus faible que le boîtier (26), dans laquelle le coefficient de dilatation du boîtier (26) est en particulier au moins plus élevé que celui des rotors à vis ou de l'au moins un élément de déplacement (10, 12).
  10. Pompe à vide à vis selon l'une des revendications 1 à 9, caractérisée en ce que les rotors à vis ne comportent pas de refroidissement interne de rotor.
  11. Pompe à vide à vis selon l'une des revendications 1 à 10, caractérisée en ce que les rotors à vis ne comportent pas de canaux parcourus par un milieu de refroidissement en particulier liquide.
  12. Pompe à vide à vis selon l'une des revendications 1 à 11, caractérisée en ce que les rotors à vis sont réalisés comme massifs.
  13. Pompe à vide à vis selon l'une des revendications 1 à 12, caractérisée en ce qu'une différence de température dans la zone des éléments de déplacement côté pression (12) entre ceux-ci et le boîtier (26) vaut en fonctionnement normal moins de 50 K, en particulier moins de 20 K.
  14. Pompe à vide à vis selon l'une des revendications 1 à 13, caractérisée en ce que la densité de flux thermique moyenne dans la zone des éléments de déplacement côté pression (12) est inférieure à 20000 W/m2, de préférence inférieure à 15000 W/m2 et en particulier inférieure à 10000 W/m2.
  15. Pompe à vide à vis selon l'une des revendications 1 à 14, caractérisée en ce que la distance entre la zone où règne 5 % à 20 % de la pression de sortie, jusqu'au dernier enroulement de l'élément de déplacement côté pression (12) vaut au moins 20 % à 30 % de la longueur de rotor.
EP17751761.2A 2016-08-30 2017-08-14 Pompe à vide à vis Active EP3507495B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202016005209.9U DE202016005209U1 (de) 2016-08-30 2016-08-30 Schraubenvakuumpumpe
PCT/EP2017/070566 WO2018041614A1 (fr) 2016-08-30 2017-08-14 Pompe à vide à vis

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EP3507495A1 EP3507495A1 (fr) 2019-07-10
EP3507495B1 true EP3507495B1 (fr) 2020-07-01

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US (1) US11300123B2 (fr)
EP (1) EP3507495B1 (fr)
JP (1) JP7132909B2 (fr)
KR (1) KR102395548B1 (fr)
CN (1) CN109642573B (fr)
BR (1) BR112019002456A2 (fr)
CA (1) CA3032898A1 (fr)
DE (1) DE202016005209U1 (fr)
WO (1) WO2018041614A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3499041B1 (fr) * 2017-12-15 2020-07-01 Pfeiffer Vacuum Gmbh Pompe à vide à vis
EP3499039B1 (fr) * 2017-12-15 2021-03-31 Pfeiffer Vacuum Gmbh Pompe à vide à vis
CN112797001A (zh) * 2021-02-26 2021-05-14 珠海格力电器股份有限公司 转子组件、压缩机及空调

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JPH03111690A (ja) 1989-09-22 1991-05-13 Tokuda Seisakusho Ltd 真空ポンプ
JP2924997B2 (ja) * 1995-01-11 1999-07-26 株式会社荏原製作所 スクリュー機械
SE505358C2 (sv) 1996-10-22 1997-08-11 Lysholm Techn Ab Axeltapp för lättmetalrotor
DE19745615A1 (de) 1997-10-10 1999-04-15 Leybold Vakuum Gmbh Schraubenvakuumpumpe mit Rotoren
DE19800711A1 (de) * 1998-01-10 1999-07-29 Hermann Dipl Ing Lang Trockene Schraubenspindel Vakuumpumpe mit innerer Vorverdichtung
NO984777L (no) 1998-04-06 1999-10-05 Cable As V Knut Foseide Safety Tyverivarslingskabel
DK1070848T3 (da) * 1999-07-19 2004-08-09 Sterling Fluid Sys Gmbh Fortrængningsmaskine til kompressible medier
DE19963172A1 (de) 1999-12-27 2001-06-28 Leybold Vakuum Gmbh Schraubenpumpe mit einem Kühlmittelkreislauf
DE20013338U1 (de) 2000-08-02 2000-12-28 Werner Rietschle GmbH + Co. KG, 79650 Schopfheim Verdichter
DE10129341A1 (de) * 2001-06-19 2003-01-02 Ralf Steffens Profilkontur einer Spindelpumpe
DE10334484A1 (de) * 2003-07-29 2005-03-24 Steffens, Ralf, Dr. Trockenverdichtende Spindelvakuumpumpe
JP4218756B2 (ja) 2003-10-17 2009-02-04 株式会社荏原製作所 真空排気装置
DE102006039529A1 (de) * 2006-08-23 2008-03-06 Oerlikon Leybold Vacuum Gmbh Verfahren zur Abreaktion selbstentzündlicher Stäube in einer Vakuumpumpvorrichtung
DE102010019402A1 (de) 2010-05-04 2011-11-10 Oerlikon Leybold Vacuum Gmbh Schrauben-Vakuumpumpe
CN202140315U (zh) * 2011-06-13 2012-02-08 浙江佳力科技股份有限公司 分段式变螺距转子结构
EP2615307B1 (fr) 2012-01-12 2019-08-21 Vacuubrand Gmbh + Co Kg Pompe à vide à vis
DE102012009103A1 (de) 2012-05-08 2013-11-14 Ralf Steffens Spindelverdichter
CN103423160B (zh) * 2013-09-04 2015-11-25 张周卫 螺旋压缩膨胀制冷机用变螺距螺旋压缩机头
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Publication number Publication date
JP7132909B2 (ja) 2022-09-07
DE202016005209U1 (de) 2017-12-01
US11300123B2 (en) 2022-04-12
KR102395548B1 (ko) 2022-05-06
WO2018041614A1 (fr) 2018-03-08
CN109642573A (zh) 2019-04-16
EP3507495A1 (fr) 2019-07-10
CA3032898A1 (fr) 2018-03-08
KR20190039966A (ko) 2019-04-16
JP2019526739A (ja) 2019-09-19
CN109642573B (zh) 2020-09-29
US20190203711A1 (en) 2019-07-04
BR112019002456A2 (pt) 2019-05-14

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