EP0608311B1 - Combinaison de commande d'admission pour systeme de compresseur - Google Patents

Combinaison de commande d'admission pour systeme de compresseur Download PDF

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Publication number
EP0608311B1
EP0608311B1 EP92921578A EP92921578A EP0608311B1 EP 0608311 B1 EP0608311 B1 EP 0608311B1 EP 92921578 A EP92921578 A EP 92921578A EP 92921578 A EP92921578 A EP 92921578A EP 0608311 B1 EP0608311 B1 EP 0608311B1
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EP
European Patent Office
Prior art keywords
inlet
compressed gas
control valve
valve
valve arrangement
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EP92921578A
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German (de)
English (en)
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EP0608311A1 (fr
EP0608311A4 (fr
Inventor
Anthony John Kitchener
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Cash Engineering Research Pty Ltd
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Cash Engineering Research Pty Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04C29/026—Lubricant separation

Definitions

  • the present invention relates to improvements in compressor systems or their component parts and particularly to flooded compressor systems employing screw or similar rotating means to effect compression of the gas.
  • Systems of the aforementioned kind conventionally comprise a number of major component parts including a screw compressor unit adapted to receive air to be compressed through an inlet filter and a main throttle valve. Lubricating oil is also introduced into the screw compressor unit adjacent its inlet zone and a mixture of compressed gas and oil is discharged from this unit to be separated in a separator vessel. Oil collected in the separator vessel is returned via a filter and an oil cooler to the screw compressor unit and clean compressed air is discharged from the separator vessel.
  • the discharged compressed air normally passes through a coalescent type final filter to remove any remaining oil droplets which is commonly housed within or in communication with the main separator vessel with the attendant problems as discussed in EP-121999-B.
  • a minimum pressure valve is supplied in the clean compressed air discharge line from the separator vessel so that the valve remains closed until such time as gas pressure in the separator vessel exceeds a predetermined minimum level.
  • the compressed gas is discharged into a storage vessel from which it is withdrawn for the desired end use. Pressure within the storage vessel is used to control operation of the compressor unit.
  • a typical arrangement of this kind is disclosed in EP-130662-B.
  • Australian Patent Specification No. 284787 discloses a flooded compressor system including a two stage compressor unit with an inlet throttle valve and a separate separator vessel with a filter configuration mounted within the separator vessel.
  • the various larger size devices such as the compressor unit and the separator vessel are interconnected by a multitude of pipes.
  • Australian Patent Specification No. 118772 discloses a flooded compressor system where the compressor unit discharges compressed gas and enhanced oil directly into a reservoir mounted to the compressor unit. Compressed gas and enhanced oil flows from the reservoir to through piping to a separate separator vessel where oil is separated from the gas without the use of a filter.
  • United Kingdom Patent Application No. 2020748 discloses a flooded compressor system where the compressor unit is at least partly mounted within pressure vessel and delivers compressed gas and oil directly into the pressure vessel.
  • the compressor unit is driven by a motor mounted on the pressure vessel and a fine oil separator is provided mounted on the pressure vessel to remove oil from compressed gas passing from the pressure vessel. Pipes are provided to connect the various parts of the compressor system together.
  • German Patent Specification No. DE 3445-400-A discloses an oil separator or filter assembly for use with a flooded compressor system where the annular filter element is housed within an outer shell. Oil laden compressed gas enters the outer shell at a lower location with compressed gas passing through the annular filter element to discharge ducts located in an upper plate closure of the outer shell.
  • the outer shell is made in two parts with the filter element being connected to a first part and a second cup-shaped part forming most of the outer shell being connectable to the first part.
  • Australian Patent Specification No. 566683 discloses a compact flooded screw compressor system where the compressor unit is mounted within a housing formed by a pot shaped part with a lid.
  • This housing also forms a separator vessel via a generally annular space surrounding the rotors of the compressor unit.
  • This annular space retains a pool of oil in its lower regions and a bore permits compressed gas with enhanced oil droplets discharged from the screw rotors to be introduced into an oil separator cartridge or filter mounted from the housing.
  • An inlet throttle valve is mounted in a suction piece which is separately mounted to the housing. Clean compressed gas is discharged from the system after passing through the oil separator cartridge or filter by passing through the housing to a suitable discharge.
  • United Kingdom Patent Specification No.1134224 also discloses a compact compressor unit with a separator vessel bolted to a housing of the compressor unit.
  • the disclosed system includes filter means comprising spaced thick felt pads or discs located in the separator vessel. Clean compressed gas is discharged from the separator vessel after passing through a check valve. Air to be compressed enters the system through inlet manifolds.
  • U.S. Patent Specification No.3825372 discloses a refrigeration compressor unit where refrigerant gas enters a power compressor unit and is discharged into a separation vessel immediately below the compressor unit after being compressed. After a two stage mechanical oil separation process, the compressed refrigeration gas is discharged for use in a refrigeration system and is thereafter recycled to the inlet of the compressor unit. No final oil filtering separation is disclosed as the refrigerant gas does not leave the refrigeration system.
  • Australian Patent Specification No.90826/82 discloses a minimum pressure valve control device for use in the compressed air pressure line from a screw-type flooded compressor system.
  • the objective of the present invention is to provide a control valve arrangement for use in a flooded compressor system which will have the effect of reducing fabrication costs of the compressor system and in particular, the number of connecting pipes and pipe end joints that need to be used in the system.
  • a preferred aspect of the present invention is to provide a flooded compressor system including a control valve arrangement as aforesaid.
  • the present invention provides a control valve arrangement for use with a flooded compressor system, said control valve arrangement including an inlet throttle valve adapted, in use, to close or open a main gas inlet to a compressor unit of the compressor system, said control valve arrangement further including inlet means adapted, in use to receive a mixture of compressed gas and liquid droplets from a separator means of the compressor system, said control valve arrangement being characterized in that a filter assembly including a filter element is mounted in a combined sub-assembly with said inlet throttle valve, said inlet means being so arranged to direct said mixture of a compressed gas and liquid droplets into said filter assembly, and discharge means being provided within said control valve arrangement to discharge clean compressed gas after passage through the filter element of said filter assembly.
  • a flooded compressor system comprising a compressor unit having an inlet throttle valve controlling introduction of gas to be compressed to said compressor unit, said compressor unit being adapted to discharge a mixture of compressed gas and liquid into a separator vessel, a final filter configuration arranged to receive compressed gas with entrained liquid droplets from said separator vessel and to discharge therefrom substantially clean compressed gas, and liquid return communication means from said separator vessel to an inlet zone of said compressor unit, said compressor system being characterized in that said final filter configuration and said inlet throttle valve are arranged in a combined sub-assembly.
  • the flooded compressor system 10 comprises a screw compressor unit 11 driven by a motor M.
  • An inlet control valve arrangement 12 is provided which receives air to be compressed at 13 preferably via an inlet filter (not shown).
  • the control valve arrangement 12 includes an inlet throttle valve 14 which directs air via a line or passage 24 to the compressor unit 11. Clean compressed air is discharged along line 15 to a receiver storage container 22.
  • the screw compressor unit 11 discharges a mixture of compressed air and oil via a line 16 into a separator vessel 23. After a primary separation of compressed air from the oil in the separator vessel 23, the compressed air (and some entrained oil droplets) is passed via a line 17 to a final filter assembly 25 (as described hereinafter) mounted from the main throttle valve 14.
  • Separated oil from the separator vessel 23 is returned to the compressor unit 11 via line 18.
  • An oil cooler and filter would normally be provided in this line or a thermal by-pass valve might be provided to bypass the cooler at certain stages of operation, if desired.
  • the clean compressed air discharged from the filter assembly 25 is directed via communication means 27 into a minimum pressure valve (MPV) 28 forming part of the valve arrangement 12.
  • MPV minimum pressure valve
  • the minimum pressure valve 28 remains closed until a minimum pressure achieved within separator vessel 23 is reached and thereafter the minimum pressure valve opens. With the minimum pressure valve 28 open, compressed air is directed via communication means 15 into the receiver 22 and this pressure is also directed onto a pressure switch (PS) 30 via a communication means 31.
  • PS pressure switch
  • the pressure switch 30 acts to keep the discharged compressed air between predetermined upper and lower pressure limits, for example between six (6) and seven (7) bars.
  • the pressure switch 30 opens to direct pressure via communication means 32 on to a vent valve (VV) 33 which acts to vent excess pressure by connecting line 64 with a vent line 34.
  • VV vent valve
  • the pressure of the compressed gas in line 34 may be communicated via communication means 35 back into the inlet throttle valve 14 which acts to close the throttle valve and inject pressurised air into the inlet of the compressor unit 11.
  • a non-return valve might be provided in line 35.
  • each embodiment comprises a filter assembly 25 mounted to a support member 37.
  • the member 37 comprising two plates or blocks 38 and 39 in which various passages and valve elements are located as described hereinafter.
  • a diaphragm member 68 separates the plates or blocks 38 and 39 which also acts as a sealing gasket therebetween.
  • the filter assembly 25 includes an outer shell 46 which is cup shaped and configured to withstand the gas pressures for which the system is designed.
  • the shell 46 is permanently or releasably secured in a sealing manner by any suitable means to the block 38 to define an enclosed space 80.
  • An annular coalescent type filter element 81 is provided within the space 80 having annular walls of filter material through which compressed gas is adaped to pass.
  • One end of the element 81 is fully closed by an end cap 82 and a second annular end 87 of the element 81 is sealed against the block 38 using a sealing gasket or the like 83.
  • a spring 94 urges the element 81 into sealing engagement.
  • any other form of sealing could be used (permanent or releasable) such that an outer space 84 and an inner space 85 is created from the enclosed space 80 such that gas can only flow between the inner and outer spaces through the filter material 86.
  • the shell or housing 46 is bolted or otherwise secured to block 38 to seal the housing 46 to the block in a manner enabling removal thereof for servicing the filter element 81 as may be desired.
  • the bolts may be employed to secure the housing 46 and the blocks 38, 39 together.
  • the housing 46 may include a screw thread arrangement at its mouth to enable it to be secured to the block 38.
  • compressed gas and entrained liquid droplets is received via line 17 by an inlet connection 88 leading to a semi circular manifold 89 in the block 38.
  • This gas and liquid flows into the space 84 and through the filter material 86 to remove the liquid droplets therefrom.
  • Clean compressed gas is then removed from the inner space 85 via an extension tube 90 and an outlet passage 91 within the block 38.
  • the minimum pressure valve 28 is located in this discharge passage 91.
  • the valve 28 is closed by a piston member 53 being urged by a spring 54 against a valve seat around passage 91. When the minimum pressure is reached, the piston 53 moves against the force of the spring 54 and pressurised gas flows into a passage 55 (see Figures 4 or 6) and thereafter into the discharge line 15.
  • the passage 55 is communicated through a passage 92 in block 38 to the pressure switch 30.
  • the pressure switch 30 opens at a lower predetermined pressure (e.g. six bars) and closes at an upper predetermined pressure (e.g. seven bars).
  • the vent valve 33 opens passage 64 from the discharge passage 91 to vent the pressurised gas.
  • the main throttle valve 14 comprises a valve member 67 supported by the diaphragm 68 to move upwardly and downwardly.
  • a spring member 98 is provided to urge the member 67, however, it should be appreciated that the spring member 98 is not essential.
  • a reduced diameter conduit 69 communicates the chamber 66 above the member 67 to the inlet zone 70 leading via line or passage 24 to the compressor unit 11.
  • the valve member 67 rests on a valve seat 71 surrounding the inlet zone 70 so that this communication zone is closed. In consequence, vacuum conditions are rapidly built up in the zone 70 which is communicated to the chamber 66 above the diaphragm.
  • a conduit 26 communicating with the base of the inner zone 85 of the filter assembly 25 is provided to drain oil collected In this base back into the inlet of the compressor unit 11.
  • a valve device 98 may be provided in the passage 25.
  • a simple construction may be used, however, both have the disadvantage that the relatively small openings may become blocked in use.
  • a labyrinth restrictor device 100 comprising a plurality of plates 101 each with a flow opening 102 and separated by gasket rings 103.
  • oil is prevented from building up in the filter assembly 25 to adversely affect the coalescent type filter element therein.
  • FIGS. 3 to 4 of the accompanying drawings show an embodiment intended for stop/start operation.
  • the pressure switch 30 senses same and stops the motor M driving the compressor.
  • the motor M is re-started to drive the compressor 11.
  • the spring 99 acts to seat the member 67 so as to close the inlet zone 70.
  • the diaphragm 68 also moves downwardly to force its loose support ring 105 downwardly so that a downward force acts on the valve stem 107 of a poppet valve 106 to open this valve.
  • pressurised gas is led from the clean gas inner zone 85 via passage 108 through the valve 106 into the zone 72 and ultimately to atmosphere via the inlet 13.
  • FIGS 5, 6 and 6A illustrate further alternative embodiments.
  • this pressure is, as discussed above, vented via the vent valve 33 and some of this pressurised air is applied to the chamber 66 via the passage 35 and also some of this air is introduced into the inlet passage 24 via the conduit 69.
  • the pressure in the chamber 66 causes the valve member 67 to close thereby preventing entry of atmospheric air from valve inlet 13 into the compressor inlet 70 and at the same time pressurised air is injected into the compressor inlet 70 to prevent the compressor compressing what air remained in the inlet over high imposed compression ratios.
  • this prevents excessive noise levels and excessive power loss during unloaded running.
  • Figure 6A illustrates a further alternative where the pressure switch 30 and air vent valve 33 are formed as valves functioning in the block 38 rather than as separate attached devices as depicted in Figure 6.
  • the discharge pressure in outlet 55 reaches the set upper limit, this is communicated to piston 109 in a pilot valve acting as pressure switch 30.
  • This pressure is sufficient to lift the piston 109 against the spring 110 and this pressure is communicated via passage 111 to the top of the minimum pressure valve 28 to close this valve and simultaneously via passage 112 to the top of the piston 113 in the vent valve 33.
  • This moves the piston 113 downwardly so that projection 114 opens a normally closed valve 115 so that pressurised gas from the passages 93 pass to passage 35 and into the chamber 66 to close the throttle valve member 67 against seat 71.
  • the pressurised gas is vented to atmosphere.
  • FIGS 7 to 9 of the accompanying drawings show a further alternative similar to Figures 2 to 4 but in this case adapted for continuous operation. Reference numerals used in the preceding discussion identify the same features in Figures 7 to 9.
  • Figures 10 to 13 illustrate a simplified control arrangement intended for use on low horsepower compressor systems (typically up to five horsepower) operated on a start/stop basis.
  • reference numerals used in the preceding discussion identify similar features in this embodiment.
  • the member 67 is urged by the spring 99 against the associated valve seat thereby closing the inlet zone 70. Vacuum conditions are rapidly created in the zone 70 which is communicated along passage 69 to the region 66 above the diaphragm 68. As a result, the diaphragm 68 and member 67 rise to allow air from the inlet 13 into the inlet zone 70 to be compressed.
  • a simple minimum pressure valve 28 is built into the block 38 beneath the clean compressed air pipe 90, the valve 28 comprising a valve member 120 urged by a spring 121 against the base of the pipe 90.
  • the valve member 120 moves against the spring 121 to allow discharge of the compressed gas along the pipe 90, past the valve member 120 to the discharge passage 55 and line 15.
  • the pressure in the discharge pipe 90, when the valve member 120 is open is also communicated via a passage 122 to a pressure switch 30.
  • the pressure switch 30 is activated to stop the motor M driving the compressor unit.
  • Pressure from the filter inner zone 85 is communicated via the pipe 90 and an opening 123 to the region 66 above the diaphragm 68.
  • the valve member 67 immediately seats to close the inlet zone 70 and this elevated pressure is applied to an elastomeric cup diaphragm 124 which raises a piston device 125 to open a simple tyre type valve 126 to allow venting of compressed air from the zone 85 along passage 127 to a vent line 128 in the block 38.
  • This pressure drops until a lower set level of the pressure switch 30 is reached whereupon the motor is re-started and the cycle is repeated.
  • Figure 13 illustrates a simple oil purge line 129 which passes through a labyrinth type restrictor device 130 (similar to that shown in Figure 3A) to pass oil collected in the base region of the inner filter zone 85 into the region 66 and from there via passage 69 into the inlet zone 70 for the compressor 11.
  • FIGS 14 and 15 illustrate still further embodiments adapted for use in relation to higher powered compressors, for example 30 horsepower compressors.
  • features not illustrated may be as disclosed in any of the previously discussed embodiments.
  • a pair of poppet type valves 130 and 131 are employed, mounted in the block 39, with their valve stems 132, 133 being moved downwardly by movement of the free diaphragm support ring 105 downwardly under action from the diaphragm 68, when the valve member 67 is seated to close the inlet zone 70.
  • the valve 130 is open and the compressed gas is discharged via the passage 108 through the region 72 to the intake 13.
  • valve 131 Similarly, compressed gas is led via passage 134 through valve 131 to be injected via passage 135 into the inlet zone 70 for the reasons previously explained.
  • Figure 15 illustrates a further alternative in that the valve 131 might be further modified to both allow injection of pressurised air into the zone 70 when the valve member 67 closes and to permit a continuous purging of oil from the base of the inner filter zone 85 along the same passage, thereby minimising fabrication costs.
  • passage 134 provides both the means for communicated pressurised air but also the oil drain or purge line.
  • the valve stem 133 in this case is modified to have a narrow bore passage 136 continuously open to drain oil into the inlet zone 70.
  • the arrangement comprises a filter assembly 25 mounted to a valve housing 37.
  • the valve housing 37 comprises a plurality of plates or blocks 38, 39, 40, 41 and 42 in which various passages and valve elements are located as described hereinafter. At least the upper plates or blocks are separated by gasket members 43, 44 and 45 which also may include holes, passages or the like as required and as described hereinafter.
  • the filter assembly 25 includes an outer shell 46 which has an annular coalescent type filter element located therein.
  • a central passage 47 is provided that communicates to an inner zone within the filter element and has a connection means 48 in the form of an outer screw thread that enables the filter assembly 25 to be screwed down onto the top face of the plate 38 so that the rim of the housing 46 is sealed against sealing surfaces on the plate 38.
  • a distribution plate within the neck of the shell 46 enables gas flow to be directed to the outer space and this gas flow is received from line 17 to a connection zone 49 in the block 39 (see Figure 17).
  • Clean compressed air discharged from the passage 47 of filter assembly 25 is directed into a passage 50 formed in the block 39, gasket 44 and plate 40.
  • this compressed air from passage 50 is directed into a transverse passage 51 formed in the block 41 and thereafter through a vertical passage 52 formed through the gaskets 45, 44 and plate 40 into the base of the minimum pressure valve 28.
  • the valve 28 is closed by a piston member 53 being urged by a spring 54 against a valve seat around passage 52.
  • the piston 53 lights against the force of the spring 54 and pressurised air flows into chamber 55.
  • a transverse passage 56 through block 39 communicates this chamber 55 to a discharge connection 57 enabling connection of the minimum pressure valve 28 via line 15 to the receiver 22 (see Figure 19).
  • the vent valve 33 comprises a spool valve element having an upper piston 60 connected to and of greater diameter than a lower piston 61 with a spring 62 urging the lower piston 61 to seal against a valve seat in chamber 63.
  • the spool element 60, 61 moves downwardly so that the valve seat in chamber 63 is opened.
  • the chamber 63 is communicated via passage means 64 (see Figure 1 and partly in Figure 18) with the discharge passage 50 from the filter assembly 25 such that when the spool element 60, 61 has moved downwardly the pressurised gas is vented to atmosphere via line 34 and is at the same time supplied via passage 35 through a non return valve 36 to a chamber 66 formed above the main throttle valve 14 comprised of valve member 67 and the diaphragm 68.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Claims (9)

  1. Aménagement de clapet de commande utilisable sur un système à compresseur noyé (10), le dit aménagement de clapet de commande (12) comprenant un clapet de réglage d'entrée (14) étudié de manière à ce que pendant le fonctionnement il ferme ou ouvre une entrée principale de gaz d'une unité de compresseur (11) du système à compresseur (10), le dit aménagement de clapet de commande (12) comprenant en outre un moyen d'entrée (88) étudié pour qu'en fonctionnement il reçoive un mélange de gaz comprimé et de gouttelettes de liquide provenant d'un moyen séparateur (23) du système à compresseur, le dit aménagement de clapet de commande (12) étant,
       caractérisé par le fait qu'un ensemble filtrant (25) comprenant un élément filtrant (81) est monté dans un sous-ensemble combiné (25, 14) au dit clapet de réglage d'entrée (14), le dit moyen d'entrée (88) étant aménagé de manière à ce qu'il oblige le dit mélange de gaz comprimé et de gouttelettes de liquide à traverser l'ensemble filtrant (25), et par le fait qu'on a prévu un moyen de déchargement (91, 55) avec le dit aménagement de clapet de commande (12) pour décharger du gaz comprimé propre après avoir traversé l'élément filtrant (81) du dit ensemble filtrant (25).
  2. Aménagement de clapet de commande selon la revendication 1,
       caractérisé en outre par le fait que le dit moyen de déchargement (91, 55) comprend un moyen à clapet de pression minimale (28) adapté pour fermer le dit moyen de déchargement (91, 55) jusqu'à ce qu'une pression prédéterminée du gaz comprimé propre ait été atteinte à l'intérieur du dit ensemble filtrant (25).
  3. Aménagement de clapet de commande selon la revendication 1,
       caractérisé par le fait que le dit ensemble filtrant (25) comprend un élément de support (37), une paroi extérieure (46) fixée au dit élément de support (37), laquelle paroi définit un volume intérieur sensiblement fermé (80), l'élément filtrant (86) étant situé à l'intérieur du dit volume sensiblement fermé (80), et lequel élément ayant des extrémités axiales opposées et une paroi annulaire interposée en matériau filtrant, une des dites extrémités axiales (87) s'engageant ou se connectant de manière étanche sur le dit élément de support (37) et l'autre extrémité axiale (82) étant fermée pour empêcher le flot de gaz de passer, au travers de la dite extrémité (82), d'une première zone (84) extérieure au dit élément filtrant (86) à une seconde zone (85) intérieure au dit élément filtrant (86), un premier moyen de communication (89) ayant été prévu pour permettre l'écoulement vers la dite première zone (84) ou de la dite première zone (84), un second moyen de communication (90) ayant été prévu pour permettre l'écoulement vers la dite seconde zone (85) ou de la dite seconde zone (85), et un moyen de connexion d'entrée (88) qui permet d'établir une connexion pendant le fonctionnement entre ledit premier ou ledit second moyen de communication (89, 90) avec le moyen séparateur (23) du système à compresseur (10), l'autre premier ou second moyen de communication (89, 90), comprenant le moyen de déchargement de gaz comprimé propre (91, 55) ou communiquant avec ce dit moyen (91, 55).
  4. Aménagement de clapet de commande selon la revendication 3,
       caractérisé par le fait que le dit moyen de déchargement (91, 55) traverse le dit élément de support (37).
  5. Aménagement de clapet de commande selon la revendication 4,
       caractérisé par le fait que le dit moyen de connexion d'entrée (88) traverse le dit moyen de support (37).
  6. Aménagement de clapet de commande selon l'une quelconque des revendications 3 à 5,
       caractérisé par le fait que le clapet à pression minimale (28) a été aménagé à l'intérieur du dit élément de support (37) étudié pour fermer ou ouvrir le dit moyen de déchargement (91, 55), le dit clapet à pression minimale (28) étant étudié pour maintenir fermé pendant le fonctionnement le dit moyen de déchargement (91, 55) jusqu'à ce que la pression minimale du gaz comprimé propre soit atteinte à l'intérieur dudit volume interne sensiblement fermé (80).
  7. Système à compresseur noyé (10) comprenant une unité de compresseur (11) ayant un clapet de réglage d'entrée (14) contrôlant l'introduction du gaz à comprimer dans la dite unité de compresseur (11), cette dite unité de compresseur (11) ayant été étudiée pour décharger un mélange de gaz comprimé et de gouttelettes de liquide dans un réservoir séparateur (23), une configuration filtrante finale (25) aménagée pour recevoir le gaz comprimé et les gouttelettes de liquide qu'il contient provenant du dit réservoir séparateur (23) et pour décharger à partir du réservoir séparateur (23) en question du gaz comprimé sensiblement propre, et un moyen de communication de renvoi du liquide (18) entre le réservoir séparateur (23) et la zone d'entrée (20) du la dite unité de compresseur (11), le système de compresseur (10) en question étant,
       caractérisé par le fait que la dite configuration filtrante finale (25) et le dit clapet de réglage d'entrée (14) ont été aménagés en sous-ensemble combiné.
  8. Système à compresseur selon la revendication 7, caractérisé par le fait que le sous-ensemble combiné est constitué par un aménagement de clapet de commande (12) qui lui-même comprend le dit clapet de réglage d'arrivée (14), l'aménagement de clapet de commande (12) en question comprenant en outre un clapet à pression minimale (28) étudié pour ouvrir et fermer un moyen de déchargement de gaz comprimé propre, le dit clapet à pression minimale (28) étant aussi étudié pour rester fermé jusqu'à ce qu'une pression minimale prédéterminée du gaz comprimé propre ait été atteinte à l'intérieur de la configuration filtrante finale (25) en question.
  9. Système à compresseur selon la revendication 7 ou la revendication 8,
       caractérisé par un moyen (69) pour acheminer le gaz comprimé entre la dite configuration filtrante finale (25) et la zone d'entrée de la dite unité de compresseur (11) en aval du clapet de réglage d'entrée (14) au fur et à mesure que le dit clapet de réglage (14) se déplace vers sa position de fermeture.
EP92921578A 1991-10-14 1992-10-14 Combinaison de commande d'admission pour systeme de compresseur Expired - Lifetime EP0608311B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU8876/91 1991-10-14
AUPK887691 1991-10-14
PCT/AU1992/000547 WO1993008404A1 (fr) 1991-10-14 1992-10-14 Combinaison de commande d'admission pour systeme de compresseur

Publications (3)

Publication Number Publication Date
EP0608311A1 EP0608311A1 (fr) 1994-08-03
EP0608311A4 EP0608311A4 (fr) 1995-08-02
EP0608311B1 true EP0608311B1 (fr) 1997-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92921578A Expired - Lifetime EP0608311B1 (fr) 1991-10-14 1992-10-14 Combinaison de commande d'admission pour systeme de compresseur

Country Status (7)

Country Link
EP (1) EP0608311B1 (fr)
JP (1) JPH07500167A (fr)
AT (1) ATE160617T1 (fr)
AU (1) AU668110B2 (fr)
DE (1) DE69223325T2 (fr)
ES (1) ES2112333T3 (fr)
WO (1) WO1993008404A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1292941B1 (it) * 1997-01-28 1999-02-11 Virgilio Mietto Distributore monoblocco per la regolazione automatica della pressione dell'aria in un serbatoio
IT1298378B1 (it) * 1997-12-19 2000-01-05 Chiara Perazzo Filtro disoleatore, con associata valvola di minima pressione per impianti erogatori di aria compressa.

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1134224A (en) * 1965-05-03 1968-11-20 Hymatic Eng Co Ltd Improvements relating to compressors
SE359159B (fr) * 1971-12-23 1973-08-20 Stal Refrigeration Ab
DE2821321A1 (de) * 1978-05-16 1979-11-22 Ruediger Dr Ing Klein Vorrichtung zur erzeugung von druckluft
US5142056A (en) * 1989-05-23 1992-08-25 Abbott Laboratories Retroviral protease inhibiting compounds
JPS5754157A (en) * 1980-09-19 1982-03-31 Nippon Kayaku Co Ltd L-argininal derivative and its preparation
DE3146535A1 (de) * 1981-11-24 1983-06-01 Isartaler Schraubenkompressoren GmbH, 8192 Geretsried "steuerungsvorrichtung fuer einen verdichter"
DE3149245A1 (de) * 1981-12-11 1983-06-16 Isartaler Schraubenkompressoren GmbH, 8192 Geretsried "verdichteranlage"
AU563570B2 (en) * 1983-04-08 1987-07-16 Cash Engineering Research Pty Ltd Compressor inlet valve
DE3445400A1 (de) * 1984-12-13 1986-06-19 Blitz M. Schneider Werkzeug- und Maschinenfabrik GmbH, 7715 Bräunlingen Oelabscheider
JPH075634B2 (ja) * 1987-10-30 1995-01-25 日東紡績株式会社 トリペプチド類及びこれを含有する抗プラスミン剤
IL89900A0 (en) * 1988-04-12 1989-12-15 Merck & Co Inc Hiv protease inhibitors useful for the treatment of aids and pharmaceutical compositions containing them
EP0361341A3 (fr) * 1988-09-28 1991-07-03 Miles Inc. Agents thérapeutiques contre le SIDA basés sur des inhibiteurs des protéases du HIV
JP2701932B2 (ja) * 1989-04-10 1998-01-21 サントリー株式会社 タンパク質分解酵素阻害剤
GB8909836D0 (en) * 1989-04-28 1989-06-14 Boots Co Plc Therapeutic agent

Also Published As

Publication number Publication date
EP0608311A1 (fr) 1994-08-03
DE69223325D1 (de) 1998-01-08
WO1993008404A1 (fr) 1993-04-29
EP0608311A4 (fr) 1995-08-02
ATE160617T1 (de) 1997-12-15
JPH07500167A (ja) 1995-01-05
DE69223325T2 (de) 1998-04-16
AU2790792A (en) 1993-05-21
AU668110B2 (en) 1996-04-26
ES2112333T3 (es) 1998-04-01

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