EP0823025B1 - Schraubenverdichter mit schutz gegen flüssigkeitsstösse - Google Patents

Schraubenverdichter mit schutz gegen flüssigkeitsstösse Download PDF

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Publication number
EP0823025B1
EP0823025B1 EP96915063A EP96915063A EP0823025B1 EP 0823025 B1 EP0823025 B1 EP 0823025B1 EP 96915063 A EP96915063 A EP 96915063A EP 96915063 A EP96915063 A EP 96915063A EP 0823025 B1 EP0823025 B1 EP 0823025B1
Authority
EP
European Patent Office
Prior art keywords
pinion
compressor
casing
high pressure
teeth
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.)
Expired - Lifetime
Application number
EP96915063A
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English (en)
French (fr)
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EP0823025A1 (de
Inventor
Bernard Zimmern
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Individual
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Individual
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Publication date
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Publication of EP0823025A1 publication Critical patent/EP0823025A1/de
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Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C18/48—Rotary-piston pumps with non-parallel axes of movement of co-operating members
    • F04C18/50—Rotary-piston pumps with non-parallel axes of movement of co-operating members the axes being arranged at an angle of 90 degrees
    • F04C18/52—Rotary-piston pumps with non-parallel axes of movement of co-operating members the axes being arranged at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • 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
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • F04C29/0035—Equalization of pressure pulses

Definitions

  • the present invention relates to a compressor rotary volumetric screw and pinion type.
  • Document FR-A-1 331 998 describes compressors comprising a screw carrying threads rotating in the bore a casing, and cooperating with at least one pinion provided with teeth engaging in and meshing with said threads defining with the housing chambers of variable volume.
  • the document FR-A-1 586 832 describes a device for compression or expansion with a rotor constituted by rotation of an arc of a circle around a rotor axis.
  • the the rotor is provided with a plurality of threads, the ridges cooperate with a revolution housing around the axis rotor.
  • the ridges mesh with the teeth of at least one pinion.
  • the pinions can slide respectively on trees and are applied against the global screw by through springs, the tension of these springs being adjustable by means of nuts.
  • Document US-A-5,080,568 describes mounted sprockets so as to turn around a tree passing through the pinion and locate the pinion shaft axially by integral with the casing on the side of the pinion exposed to the high pressure.
  • the present invention relates to a compressor to bring a gas from a low pressure to a high pressure, comprising a screw provided with at least one thread, turning in a casing and cooperating with at least one pinion carrying teeth engaging in and meshing with the net, defining with the housing a volume to increase the fluid pressure, one side of the teeth being exposed to high pressure fluid, the other being exposed to the fluid at low pressure, the pinion consists of a plastic blade in which the meshing teeth are formed waterproof with the net and placed on the high pressure side of the gable, supported by a metal support on the lower side pressure, the high pressure side of the plastic blade of the pinion being in almost watertight contact with a lip of the casing, thrust means for exerting a pressing force the pinion shaft against stop devices, the force of support created by said means being greater than the force maximum exerted on the pinion during operation compressor normal.
  • This arrangement produces the remarkable effect of substantially reduce damage to the compressor during what is commonly referred to as a liquid blow, without deterioration of the profile of plastic teeth or characteristics of the compressor.
  • the compressor may have to compress liquid instead of gas for a very short time period, usually less than a second, and this creates which is generally referred to as a liquid blow.
  • the pressures created are then several times higher than the pressures for which the compressor is designed, usually 10 to 20 times.
  • the pressure in the thread creates an axial force on the pinion which largely exceeds that exerted by the means support thrust and the pinion will move axially, thus opening a space between the high pressure side of the teeth and housing lip, allowing excess liquid in the net to escape through said space and so to keep the pressure in the net within limits acceptable.
  • the remarkable result that has been observed with a compressor according to the invention is that no drop in characteristics does not occur even if the compressor is subjected to repeated liquid blows.
  • Figure 1 is a partial section along line I - I of Figure 2, of a preferred embodiment of a machine according to the invention, in the axis of one of its pinions perpendicular to the axis of the screw.
  • Figure 2 is a schematic half-section of the machine according to line II - II of figure 1.
  • Figure 3 is a partial section, as in Figure 1, of an alternative embodiment of the invention putting in works a pinion with a rotating shaft.
  • a screw 1, rotating around an axis 2 has a substantially helical thread 1a (Fig 2) which meshes with sprocket teeth 3 4. Both are mounted in a casing 5 pierced with a bore 6 whose proximity to the vertex 1b of the nets which separates the hollows from the nets successive provides a virtual seal. Due to the engagement between the screw 1 and the pinion 4, the rotation of the screw causes a corresponding rotation of the pinion.
  • the pinion is made in a known manner from a blade plastic 7 supported by a metal support 8, the latter itself carrying two bearings 9 and 10 which hold the pinion 4 on a shaft 11 allowing its rotation.
  • the shaft 11 has its axis determined by a bore 12 in the casing and a bore 13 formed in a support 14, itself centered in a bore 15 of the casing.
  • thrust means such as the spring washers 17 push the shaft 11 towards the stop 18, itself held in position by the cover 19 fixed to the casing.
  • the length of the stopper 18 is fixed so that after assembly, the clearance 20 between the lip 21 of the casing and the pressure face 22 of the plastic tooth is held at a minimum value, generally a few tens of microns.
  • the spring washers 17 are calculated such that so that after assembly, the push they exert exceeds the axial load created by the high pressure acting according to arrow 16. They are typically chosen so that their force represents 150 to 200% of the maximum thrust experienced by the pinion when the compressor operates under pressures extremes for which it is designed.
  • the thickness of the spring washers is generally chosen to limit the axial displacement of the pinion to values depending on the plastic and its dimensions, especially its thickness; as indicated above, the axial displacement of the pinion seems to reduce the width of the net seen by the pinion and excessive movement could lead to permanent damage; but displacements of around 0.5 and even 1 mm have been accepted by plastic teeth without damage.
  • the invention has been described with a rotating pinion around a fixed tree but could be applied to other arrangements, for example when the pinion shaft is integral with the pinion support and rotates with it, and that the bearings holding the pinion are directly mounted in the casing.
  • the pushing means 17a would push the bearing against the flange 18a secured to the support 14a by nuts 22 as shown in FIG. 3.
  • the invention would not be modified substantially if the spring washers 17 used for create the thrust holding the pinion shaft against the stop 18 were replaced by other means of generating thrust, such as a piston acting under the pressure of a gas, e.g. high exhaust pressure, piston having a cross section sufficient for its thrust to be superior, in all cases except stroke of liquid, to the force applied to the teeth of the pinion by the gas in compression.
  • a gas e.g. high exhaust pressure
  • the invention would also apply if the means stop against which the pinion is pushed by the means thrust were located, not in the side casing high pinion pressure, but in another location.
  • the invention applies to the case where the stop means are located on the low pressure side of axis 11.
  • Such means could be an extended pin perpendicularly across the tree 11 in the region of the bore and in an oblong hole made in the support 14.
  • the clearance 20 is at the desired value of a few tens of microns.
  • the set 20 reaches the value of 0.5 mm, or even 1 mm.

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

Claims (2)

  1. Kompressor zur Verdichtung eines Gases von einem Niedrigdruck, zu einem Hochdruck, mit einer mindestens einem Gewinde (1a) ausgestatteten Schraube (1), die sich in einem Gehäuse (5) dreht und mit mindestens einem Ritzel (4) mit Zähnen (3) zusammenwirkt, die in das Gewinde eingreifen, um mit dem Gehäuse ein Volumen zu definieren, um dort den Druck des Mediums zu erhöhen, wobei eine Fläche der Zähne dem Hochdruckmedium und die andere dem Niedrigdruckmedium ausgesetzt ist, wobei das Ritzel aus einem Plastikblatt (7) besteht, in dem die Zähne gebildet sind, die dicht in das Gewinde eingreifen, und das auf der Hochdruckseite des Ritzels angeordnet ist, der auf der Niedrigdruckseite von einem Metallträger (8) gestützt wird ; wobei dieser Kompressor dadurch gekennzeichnet ist, dass die Hochdruckfläche des Plastikblattes des Ritzels sich in quasi dichtem Kontakt mit einer Lippe (21) des Gehäuses befindet, während Schubmittel (17) zum Ausüben einer Kraft die Welle (11) des Ritzels (4) gegen Arretiervorrichtungen (18) drücken, wobei die von den besagten Mitteln erzeugte Druckkraft grösser ist als die maximale, auf das Ritzel während des normalen Betriebs des Kompressors ausgeübte Kraft.
  2. Kompressor nach Anspruch 1, dadurch gekennzeichnet, dass die Arretiervorrichtungen (18) im Gehäuse (5) auf der Hochdruckseite angeordnet sind.
EP96915063A 1995-04-28 1996-04-19 Schraubenverdichter mit schutz gegen flüssigkeitsstösse Expired - Lifetime EP0823025B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9505108A FR2733549A1 (fr) 1995-04-28 1995-04-28 Compresseur a vis avec protection des coups de liquide
FR9505108 1995-04-28
PCT/FR1996/000603 WO1996034204A1 (fr) 1995-04-28 1996-04-19 Compresseur a vis avec protection des coups de liquide

Publications (2)

Publication Number Publication Date
EP0823025A1 EP0823025A1 (de) 1998-02-11
EP0823025B1 true EP0823025B1 (de) 1999-06-30

Family

ID=9478531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96915063A Expired - Lifetime EP0823025B1 (de) 1995-04-28 1996-04-19 Schraubenverdichter mit schutz gegen flüssigkeitsstösse

Country Status (8)

Country Link
US (1) US5890884A (de)
EP (1) EP0823025B1 (de)
JP (1) JPH11504096A (de)
CN (1) CN1091848C (de)
AU (1) AU5696596A (de)
DE (1) DE69603076T2 (de)
FR (1) FR2733549A1 (de)
WO (1) WO1996034204A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009174520A (ja) * 2007-12-26 2009-08-06 Daikin Ind Ltd ゲートロータおよびスクリュー圧縮機
JP4301345B1 (ja) * 2007-12-28 2009-07-22 ダイキン工業株式会社 スクリュー圧縮機
CN110446858B (zh) * 2017-03-21 2021-08-03 大金工业株式会社 单螺杆压缩机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1496275A (fr) * 1966-10-07 1967-09-29 Goodyear Pumps Ltd Pompe rotative à vis sans fin et roue à disque
FR1586832A (de) * 1968-02-08 1970-03-06
FR2148677A5 (de) * 1971-07-30 1973-03-23 Zimmern Bernard
JPS5911759B2 (ja) * 1974-04-15 1984-03-17 北越工業 （株） 回転方向と直径方向とに自由に全体が浮遊的変位可能に組立てられたピニオンの歯を有するグロボイドウオ−ム型圧縮機及び膨張機
FR2624215B1 (fr) * 1987-12-03 1990-05-11 Zimmern Bernard Pignons flottants pour machine a vis haute pression
US5080568A (en) * 1990-09-20 1992-01-14 Bernard Zimmern Positive displacement rotary machine

Also Published As

Publication number Publication date
CN1091848C (zh) 2002-10-02
JPH11504096A (ja) 1999-04-06
US5890884A (en) 1999-04-06
AU5696596A (en) 1996-11-18
FR2733549A1 (fr) 1996-10-31
DE69603076D1 (de) 1999-08-05
CN1183136A (zh) 1998-05-27
DE69603076T2 (de) 2000-01-27
WO1996034204A1 (fr) 1996-10-31
EP0823025A1 (de) 1998-02-11

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