EP2142806A1 - Compressor system for underwater use in the offshore area - Google Patents

Compressor system for underwater use in the offshore area

Info

Publication number
EP2142806A1
EP2142806A1 EP08759450A EP08759450A EP2142806A1 EP 2142806 A1 EP2142806 A1 EP 2142806A1 EP 08759450 A EP08759450 A EP 08759450A EP 08759450 A EP08759450 A EP 08759450A EP 2142806 A1 EP2142806 A1 EP 2142806A1
Authority
EP
European Patent Office
Prior art keywords
housing
compressor system
stator
compressor
cooling
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.)
Granted
Application number
EP08759450A
Other languages
German (de)
French (fr)
Other versions
EP2142806B1 (en
Inventor
Maria Bade
Joachim Mucha
Axel MÖHLE
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2142806A1 publication Critical patent/EP2142806A1/en
Application granted granted Critical
Publication of EP2142806B1 publication Critical patent/EP2142806B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0686—Units comprising pumps and their driving means the pump being electrically driven specially adapted for submerged use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5826—Cooling at least part of the working fluid in a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine

Definitions

  • the invention relates to a compressor system, in particular for the production of gases or gas / oil mixtures in the offshore sector.
  • the compressor system has a seawater-resistant housing with at least one access opening for gases or gas / oil mixtures to be compressed and with at least one outlet opening for the compressed gases or gas / oil mixtures. It has a compressor arranged in the housing, which is connected on the input side to the access opening and on the output side to the output opening.
  • an electric motor is arranged with a stator and a rotor package for driving the compressor.
  • the compressor systems can be driven by an electric motor or by a gas turbine.
  • the electric motor is preferably a brushless asynchronous motor.
  • a high-speed turbine is used for compression, in which case the turbine and the electric motor are preferably arranged on a common shaft.
  • the brush- and gearless drive allows almost maintenance-free operation of such compressor systems.
  • screw or reciprocating compressors can be used for compression.
  • the considered compressor systems may be installed in coastal petrochemical facilities, on drilling platforms or under water.
  • the drive of the compressor is typically carried out with an electric motor.
  • the supply of the gas or the gas / oil mixture is usually via a pipe which is flanged to the outside of the housing of the compressor system.
  • the further transport of the compressed gas or gas / oil mixture takes place on the output side via a further pipeline.
  • a pressure hose can be used instead of a pipe.
  • the high electrical connection capacity of the electric motors used in the range of several 100 kW makes cooling of the electric motors necessary.
  • an oil recooling system is used, which is connected as a separate unit via oil supply lines and oil return lines to the compressor system.
  • Such compressor systems are disadvantageously expansive because of the externally arranged oil recooling.
  • Another disadvantage is that the external oil recooling systems may leak over time.
  • the oil feed pipes and the oil return pipes themselves may become leaky, in particular due to corrosion caused by sea water or due to mechanical effects, such as corrosion. by waves.
  • pressure-tight connection connections of the pipelines to the housing of the compressor system can become leaky over time. Escaping oil and oil / gas mixtures in this context represents a potential ecological hazard to the surrounding waters.
  • the object of the invention is achieved by a compressor system having the features of claim 1. Further advantageous embodiments are specified in the dependent claims 2 to 8.
  • the stator core of the electric motor can be cooled via an inner side of the housing of the compressor system.
  • Another great advantage is that the risk of pollution is significantly reduced, since all components of the cooling system are housed in the housing. Potentially leaking connection points for connecting an otherwise required recooling system to the housing are not even available.
  • the stator of the electric motor on a stator outside, which rests at least almost flush on the inside of the housing.
  • a good thermal conductivity mass is introduced between the Statorau type and the inside of the housing.
  • the good heat conductive mass may be e.g. a thermal grease or a good heat conductive plastic.
  • the stator core is spaced from the inside of the housing.
  • the stator in this case forms with at least one opposite part of the inside of the housing an annular Cooling chamber off. In the cooling chamber, a coolant is present.
  • stator pack with its particularly hot spots, such as with its axially projecting end windings, completely immersed in the coolant.
  • the cooling of these hot and critical points is therefore particularly effective. With "axial" directions are designated parallel to the axis of rotation of the electric motor.
  • the coolant is a liquid, in particular an oil, such as a silicone or mineral oil. In addition to the high specific heat capacity, this has an advantageous electrically insulating effect with regard to the live winding ends.
  • other coolants may be used, such as water-based coolants.
  • the coolant may alternatively be a refrigerant such as Freon ® R134a.
  • the coolant is a sol, that is, a liquid / gas mixture.
  • cooling passages extending substantially axially relative to the axis of rotation of the electric motor are provided in the stator core.
  • the compressor system has a circulation pump for the coolant. By the circulation a more even and also higher cooling achievement is achieved.
  • the compressor system for the intended use is installed such that the axis of rotation of the electric motor extends substantially in the vertical direction.
  • the present arrangement causes self-acting sets a cooling circuit within the cooling chamber. Because the heating of the coolant in the respective cooling channels causes this rises and flows out of the upper axial end face of the stator. Subsequent coolant forcibly conveys the heated coolant to the inside of the housing that is cold compared to the coolant temperature. The subsequent cooling causes an increase in specific gravity and a decrease in the coolant. Arrived at the lower end of the cooling chamber, the cooled coolant is in the direction of the axial lower end of the
  • baffles For the purpose of directing the circulating liquid flow forming in the cooling chamber, baffles, e.g. be arranged at the axial ends of the stator.
  • the housing has an outer housing side, on which a plurality of cooling fins is arranged.
  • the cooling fins cause a significant increase in the cooling surface to the sea water.
  • the enlarged cooling surface may, depending on the shape and number of existing cooling fins, be a multiple of the otherwise existing outer surface of the housing of the compressor system.
  • the cooling fins are away from the outside of the housing.
  • the housing has a cylindrical shape.
  • the heat sinks are radially away from the outside of the housing.
  • radial are meant directions toward and away from the axis of symmetry of the cylindrical housing, and typically the axis of symmetry coincides with the axis of rotation of the electric motor.
  • FIG. 1 is a sectional view of a compressor system along the axis of rotation of an electric motor and a compressor according to a first embodiment of the invention
  • FIG. 2 shows a sectional view of a compressor system according to a second embodiment of the invention
  • FIG. 3 shows a sectional view of a compressor system according to a third embodiment of the invention and FIG. 4 shows a side view of the compressor system according to FIG. 3 corresponding to the viewing direction IV shown in FIG.
  • FIG. 1 shows a sectional view of a compressor system 1 along the axis of rotation DA of an electric motor 7 and a compressor 8 according to a first embodiment of the invention.
  • a housing 2 is seawater resistant.
  • the housing 2 is preferably made of steel and may have a protective coating to prevent corrosion.
  • the steel used may alternatively or additionally be a stainless steel.
  • the housing 2 may be made of a seawater resistant aluminum.
  • the housing is pressure-tight, in accordance with the intended for operation of the compressor system 1 depth of use under the sea water level or on the seabed.
  • the pressure-tight requirements relate not only to the housing 2 itself, but also implementations in the housing, such as for power and control cables for power supply and for controlling and / or monitoring of the compressor system.
  • the housing 2 has, for example, an access opening 3 for the gases or gas / oil mixtures to be compressed and an outlet opening 4 for the compressed gases or gas / oil mixtures.
  • a plurality of openings 3, 4 may be present.
  • At the two openings 3, 4 are usually connecting elements, such as couplings or flanges, mounted in order to connect to these pipes or pressure hoses.
  • the connection elements and the pipes are to be interpreted in a technically robust manner with respect to the required pressure tightness.
  • the compressor 8 is arranged in the housing 2, which is connected on the input side to the access opening 3 and on the output side to the outlet opening 4.
  • the arrows shown in the region of the openings 3, 4 indicate the flow directions.
  • the compressor 8 a turbine 81 with not further designated turbine blades. Their diameter decreases in the axial direction, that is, in the flow direction, whereby the pressure increases due to the compression at the same time.
  • the reference numeral 83 denotes a high-pressure discharge. From there, the transport of the compressed gas to the outlet opening 3 takes place via a pipe connection (not further described) in the interior of the housing 2.
  • the electric motor 7 is further arranged for driving the compressor 8.
  • the electric motor 7 has a stator 71 and a rotor package 72. Furthermore, in the example of FIG 1, both the compressor 8 and the
  • the stator 71 of the electric motor 7 can be cooled via a housing inner side GI of the housing 2 of the compressor system 1.
  • the cooling via a stator outside SA, which rests flush against the inside of the housing GI.
  • a good heat-conductive mass may be introduced between the stator outside SA and the inside of the housing GI, such as a good heat-conductive paste, a grease or the like.
  • the compressor system 1 shown is installed in such a way that the axis of rotation DA of the electric motor 7 extends essentially in the vertical direction. It can alternatively be aligned in a horizontal position.
  • the housing 2 has a housing outside GA, on which a plurality of projecting cooling fins 21 is arranged.
  • the cooling fins 21 are radially away from the housing outside GA.
  • the alternative embodiments of the compressor system 1 according to FIG. 2 and FIG. 3 also have such a cylindrical design.
  • FIG. 2 shows a sectional view of a compressor system 1 according to a second embodiment of the invention.
  • the compressor system 1 shown is in turn vertically installed with respect to the axis of rotation DA of the electric motor 7.
  • the stator 71 is spaced from the inside GI of the housing 2.
  • the mean radial distance is preferably in a range of 5 cm to 15 cm. Depending on the electrical connection power of the electric motor 7, the distance values can also lie above it, such as, for example, at 20 cm or below, for example at 3 cm.
  • the stator core 71 forms with at least one opposite part of the inside of the housing GI an annular cooling chamber 9 in which a coolant 9 is present.
  • the cooling chamber 9 In the cooling chamber 9 are also the winding heads 73 of the stator 71, which protrude axially from the stator 71.
  • the cooling chamber 9 has only one chamber in the example of FIG. It can alternatively have several chambers. sen, in which case adjacent chambers are each separated by a radially axially extending bulkhead from each other.
  • the cooling chamber 9 is formed by two ripeness 91, 92 and a circular disk 94.
  • the two ripen 91, 92 have an inner diameter which corresponds to the inner diameter of the stator 71.
  • the first hoop 91 is sealed to a lower axial end face of the stator pack 71, such as e.g. welded.
  • the axis of symmetry of this hoop 91 is aligned with the axis of rotation DA of the electric motor 7.
  • the axial height of the first hoop 91 corresponds to almost the axial distance of the stator 71 to a bottom plate 22 of the housing 2.
  • the lower edge of the first hoop 91 can via a sealing ring 93 for Bottom plate 22 to be sealed towards sealed or welded to the bottom plate 22.
  • the second hoop 92 is similarly attached to the upper axial end of the stator core 71.
  • the circular disk 94 has an inner diameter which corresponds approximately to the inner diameter of the maturity 91, 92.
  • the outer diameter corresponds approximately to the inner diameter of the housing 2.
  • the second hoop 92 and the circular disk 94 are preferably welded together tightly and together form a flange 92, 94.
  • the outer edge of the circular disk 94 and the flange 92, 94 can via another Gasket 95 may be sealed to the inside of the housing GI or tightly welded to the inside of the housing GI.
  • the maturity 91, 92, the circular disc 94, a radial inner side of the stator packet 71 and the housing inner side GI thus form a hollow cylinder.
  • a coolant preferably an oil
  • a so-called transformer oil based on mineral oil or silicone oil is considered.
  • Coolant filled In the housing 2 and outside the cooling chamber 9, a compensating vessel for the cooling liquid be present to compensate for a temperature-induced change in volume of the coolant.
  • the coolant may be a refrigerant as an alternative to oil, such as Freon ® a.
  • a CFC-free Freon ® is particularly advantageous in terms of environmental compatibility, such as Freon ® R134a.
  • the cooling chamber 9 is filled with a sol, that is, with a liquid / gas mixture.
  • cooling passages 75 extending essentially axially to the axis of rotation DA of the electric motor 7 are present in the stator pack 71. Because of the embedding of the stator 71 in the coolant, these are also filled with the coolant.
  • a circulation of the coolant in the cooling chamber 9 is established. This is represented by flow arrows.
  • the coolant heated in the cooling channels 75 rises upwards and cools down in the reverse direction from top to bottom along the cold inside of the housing GI.
  • the thermally particularly critical winding heads 73 are surrounded by the circulating coolant and thus effectively cooled.
  • the cooling circuit established in the cooling chamber 9 can also be referred to as the primary cooling circuit, while at the outside of the housing, but only in the case of a calming body of water, a counterflow is established which sweeps from the bottom upwards along the exterior of the housing GA.
  • the cooling by the seawater can also be called secondary cooling.
  • the compressor system 1 may comprise a circulation pump for the coolant.
  • the circulating pump is, for example, a centrifugal pump which is mounted in or on the cooling chamber 9.
  • the cooling fins 21 are formed on the outside of the housing 2 GA shorter in length. They extend only in the axial "hot" region of the housing 2, which lies opposite the cooling chamber 9. The cooling of the compressor 8 takes place in this connection via the gases or gas / oil mixtures themselves to be compressed.
  • FIG 3 shows a sectional view of a compressor system 1 according to a third embodiment of the invention.
  • the cooling chamber 9 is formed substantially toroidal, wherein the cooling chamber 9 curved cooling chamber walls 96, 97 which favor the circulating flow through their shape.
  • the cooling capacity of this embodiment is therefore larger in comparison to the second embodiment with the same construction volume.
  • the cooling chamber walls 96, 97 fulfill in addition to the formation of the cooling chamber 9 and a Strömungsleitfunktion.
  • the reference numerals 98, 99 further sealing rings for sealing the cooling chamber walls 96, 97 are designated with the housing inner side GI.
  • the cooling chamber walls 96, 97 may be tightly welded to the inside of the housing GI.
  • FIG. 4 shows a side view of the compressor system 1 according to FIG. 3 corresponding to the viewing direction IV shown in FIG.
  • the stator 71 has a plurality of circumferentially uniformly distributed cooling channels 75 on.
  • the cooling channels 75 are arranged with respect to their radial position to the winding heads 73 on both sides of the winding heads 73 (see also FIG 2 and FIG 3).
  • the arrangement of the cooling channels 75 is preferably carried out in the magnetically less active region of the stator 71.
  • the plurality of cooling channels 75 allows an effective cooling of the stator 71 almost from the inside out.
  • cooling fins 21 On the outer side of the housing GA, a plurality of radially directed from the outside of the housing facing away arranged cooling fins 21 can be seen.
  • the cooling fins 21 cause a drastic increase in the cooling surface available for cooling by seawater.
  • the cooling fins 21 are an integral part of the housing 2 of the compressor system 1.
  • the housing 2 is made of a cast.
  • the compressor system according to the invention is also suitable for high-speed compressor systems at speeds of up to 15,000 rpm and powers of a few 100 kW up to 10 MW and more.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention relates to a compressor system (1), particularly for conveying gases or gas/oil mixtures in the offshore area, with a seawater-tight housing (2) with at least one access opening (3) for gases or gas/oil mixtures which are to be compressed, and with at least one outlet opening (4) for the compressed gases or gas/oil mixtures. In the housing (2), a compressor (8) is disposed, which is connected at the inlet side to the access opening (3) and, at the outlet side, to the outlet opening (4). An electric motor (7), which has a stator assembly (71) and a rotor assembly (72) for driving the compressor (8), is disposed in the housing (2). According to the invention, the stator assembly (71) can be cooled over an inner side (GI) of the housing (2) of the compressor system (1).

Description

Beschreibungdescription
Verdichtersystem für den Unterwassereinsatz im Offshore- BereichCompressor system for underwater use in the offshore sector
Die Erfindung betrifft ein Verdichtersystem, insbesondere zur Förderung von Gasen oder Gas-/Ölgemischen im Offshore-Be- reich. Das Verdichtersystem weist ein seewasserfestes Gehäuse mit zumindest einer Zugangsöffnung für zu verdichtende Gase oder Gas-/Ölgemische und mit zumindest einer Ausgangsöffnung für die verdichteten Gase oder Gas-/Ölgemische auf. Es weist einen im Gehäuse angeordneten Verdichter auf, welcher ein- gangsseitig mit der Zugangsöffnung und ausgangsseitig mit der Ausgangsöffnung verbunden ist. Im Gehäuse ist ein Elektromo- tor mit einem Statorpaket und einem Rotorpaket zum Antreiben des Verdichters angeordnet.The invention relates to a compressor system, in particular for the production of gases or gas / oil mixtures in the offshore sector. The compressor system has a seawater-resistant housing with at least one access opening for gases or gas / oil mixtures to be compressed and with at least one outlet opening for the compressed gases or gas / oil mixtures. It has a compressor arranged in the housing, which is connected on the input side to the access opening and on the output side to the output opening. In the housing, an electric motor is arranged with a stator and a rotor package for driving the compressor.
Die Offshore-Förderung, das heißt die Förderung von Öl und Gas in küstennahen Gewässern, stellt hohe Anforderungen an Verdichtersysteme. Sie müssen rauem Klima, korrodierenden Umweltbedingungen sowie unberechenbaren Gaszusammensetzungen gewachsen sein. Die Verdichtersysteme können mit einem Elektromotor oder mit einer Gasturbine angetrieben werden. Der Elektromotor ist vorzugsweise ein bürstenloser Asynchronmo- tor. Üblicherweise wird zum Verdichten eine schnelllaufende Turbine verwendet, wobei in diesem Falle die Turbine und der Elektromotor vorzugsweise auf einer gemeinsamen Welle angeordnet sind. Der bürsten- und getriebelose Antrieb erlaubt einen nahezu wartungsfreien Betrieb derartiger Verdichtersys- teme . Alternativ können auch Schrauben- oder Kolbenkompressoren zum Verdichten verwendet werden.Offshore production, ie the extraction of oil and gas in offshore waters, places high demands on compressor systems. They have to cope with harsh climates, corrosive environmental conditions and unpredictable gas compositions. The compressor systems can be driven by an electric motor or by a gas turbine. The electric motor is preferably a brushless asynchronous motor. Usually, a high-speed turbine is used for compression, in which case the turbine and the electric motor are preferably arranged on a common shaft. The brush- and gearless drive allows almost maintenance-free operation of such compressor systems. Alternatively, screw or reciprocating compressors can be used for compression.
Die betrachteten Verdichtersysteme können in Einrichtungen der Petrochemie an der Küste, auf Bohrplattformen oder auch unter Wasser installiert sein. Im letzteren Fall erfolgt der Antrieb des Verdichters typischerweise mit einem Elektromotor . Die Zuführung des Gases bzw. des Gas-/Ölgemisches erfolgt üblicherweise über eine Rohrleitung, welche an der Gehäuseaußenseite des Verdichtersystems angeflanscht ist. In entsprechender Weise erfolgt der Weitertransport des verdichteten Gases bzw. Gas-/Ölgemisches ausgangsseitig über eine weitere Rohrleitung. Alternativ kann anstelle einer Rohrleitung ein Druckschlauch verwendet werden.The considered compressor systems may be installed in coastal petrochemical facilities, on drilling platforms or under water. In the latter case, the drive of the compressor is typically carried out with an electric motor. The supply of the gas or the gas / oil mixture is usually via a pipe which is flanged to the outside of the housing of the compressor system. In a corresponding manner, the further transport of the compressed gas or gas / oil mixture takes place on the output side via a further pipeline. Alternatively, a pressure hose can be used instead of a pipe.
Die hohe elektrische Anschlussleistung der verwendeten Elek- tromotoren im Bereich von mehreren 100 kW macht eine Kühlung der Elektromotoren erforderlich. Üblicherweise wird eine Öl- rückkühlanlage verwendet, welche als separate Einheit über Ölzulaufleitungen und Ölrücklaufleitungen an das Verdichtersystem angeschlossen ist. Derartige Verdichtersysteme sind wegen der außerhalb angeordneten Ölrückkühlanlagen nachteilig raumgreifend.The high electrical connection capacity of the electric motors used in the range of several 100 kW makes cooling of the electric motors necessary. Usually, an oil recooling system is used, which is connected as a separate unit via oil supply lines and oil return lines to the compressor system. Such compressor systems are disadvantageously expansive because of the externally arranged oil recooling.
Ein weiterer Nachteil ist, dass die externen Ölrückkühlanlagen mit der Zeit undicht werden können. Zum einen können die Ölzulaufleitungen und die Ölrücklaufleitungen selbst undicht werden, insbesondere durch eine meerwasserbedingte Korrosion oder durch mechanische Einwirkungen, wie z.B. durch Wellenschlag. Zum anderen können auch druckdicht ausgeführte Anschlussverbindungen der Rohrleitungen am Gehäuse des Verdich- tersystems mit der Zeit undicht werden. Austretendes Öl sowie Öl-/Gasgemische stellt in diesem Zusammenhang eine potentielle ökologische Gefahr für die umgebenden Gewässer dar.Another disadvantage is that the external oil recooling systems may leak over time. On the one hand, the oil feed pipes and the oil return pipes themselves may become leaky, in particular due to corrosion caused by sea water or due to mechanical effects, such as corrosion. by waves. On the other hand, pressure-tight connection connections of the pipelines to the housing of the compressor system can become leaky over time. Escaping oil and oil / gas mixtures in this context represents a potential ecological hazard to the surrounding waters.
Es ist eine Aufgabe der Erfindung ein Verdichtersystem an- zugeben, bei welchem die zuvor beschriebenen Nachteile vermieden werden.It is an object of the invention to provide a compressor system in which the disadvantages described above are avoided.
Die Aufgabe der Erfindung wird durch ein Verdichtersystem mit den Merkmalen des Anspruchs 1 gelöst. Weitere vorteilhafte Ausführungsformen sind in den abhängigen Ansprüchen 2 bis 8 angegeben . Erfindungsgemäß ist das Statorpaket des Elektromotors über eine Innenseite des Gehäuses des Verdichtersystems kühlbar.The object of the invention is achieved by a compressor system having the features of claim 1. Further advantageous embodiments are specified in the dependent claims 2 to 8. According to the invention, the stator core of the electric motor can be cooled via an inner side of the housing of the compressor system.
Damit ist der Vorteil verbunden, dass keine externe Ölrück- kühlanlage benötigt wird. Durch die Integration der Kühlanlage in das Verdichtersystem reduziert sich der Raumbedarf erheblich. Da der größte Teil der im Elektromotor anfallenden Verlustwärme im Statorpaket anfällt, kann diese quasi am Entstehungsort abgeführt und über die Wandung des Gehäuses des Verdichtersystems an das Meerwasser abgegeben werden, welches das Gehäuse umspült. Die zuvor genannte Verlustwärme im Statorpaket stammt hauptsächlich von elektrischen Verlusten einer im Statorpaket eingebrachten Stromwicklung sowie von Um- magnetisierungsverlusten im typischerweise als Blechpaket ausgeführten Statorpaket.This has the advantage that no external oil recooling system is needed. The integration of the cooling system in the compressor system reduces the space requirement considerably. Since most of the heat loss incurred in the electric motor accumulates in the stator, it can be quasi quenched at the point of origin and discharged through the wall of the housing of the compressor system to the seawater, which surrounds the housing. The previously mentioned heat loss in the stator core mainly stems from electrical losses of a current winding introduced in the stator pack as well as from magnetization losses in the stator pack, which is typically designed as a laminated core.
Ein weiterer großer Vorteil ist, dass das Risiko einer Umweltverschmutzung erheblich reduziert wird, da sämtliche Komponenten der Kühlanlage im Gehäuse untergebracht sind. Poten- tiell undichte Anschlussstellen zum Anschluss einer sonst erforderlichen Rückkühlanlage am Gehäuse sind erst gar nicht vorhanden .Another great advantage is that the risk of pollution is significantly reduced, since all components of the cooling system are housed in the housing. Potentially leaking connection points for connecting an otherwise required recooling system to the housing are not even available.
Nach einer Ausführungsform des Verdichtersystems weist das Statorpaket des Elektromotors eine Statoraußenseite auf, welche zumindest nahezu bündig an der Gehäuseinnenseite anliegt. Zwischen der Statoraußenseite und der Gehäuseinnenseite ist eine gut wärmeleitfähige Masse eingebracht. Die gut wärme- leitfähige Masse kann z.B. eine Wärmeleitpaste oder ein gut wärmeleitfähiger Kunststoff sein. Dadurch wird der Wärmeübergangswiderstand vom Statorpaket zum Gehäuse deutlich reduziert. Die Kühlung des Elektromotors wird verbessert.According to one embodiment of the compressor system, the stator of the electric motor on a stator outside, which rests at least almost flush on the inside of the housing. Between the Statoraußenseite and the inside of the housing a good thermal conductivity mass is introduced. The good heat conductive mass may be e.g. a thermal grease or a good heat conductive plastic. As a result, the heat transfer resistance from the stator to the housing is significantly reduced. The cooling of the electric motor is improved.
Nach einer alternativen bevorzugten Ausführungsform ist das Statorpaket von der Innenseite des Gehäuses beabstandet. Das Statorpaket bildet in diesem Fall mit zumindest einem gegenüberliegenden Teil der Gehäuseinnenseite eine ringförmige Kühlkammer aus. In der Kühlkammer ist ein Kühlmittel vorhanden .According to an alternative preferred embodiment, the stator core is spaced from the inside of the housing. The stator in this case forms with at least one opposite part of the inside of the housing an annular Cooling chamber off. In the cooling chamber, a coolant is present.
Der Wärmeübergangswiderstand vom Statorpaket zum Gehäuse wird wegen der vollständigen Einbettung des Statorpakets im Kühlmittel und wegen der Benetzung der Gehäuseinnenseite mit dem Kühlmittel drastisch reduziert. Der Grund dafür ist, dass das Statorpaket mit seinen besonders heißen Stellen, wie z.B. mit seinen axial überstehenden Wickelköpfen, komplett im Kühlmit- tel eingetaucht ist. Die Kühlung dieser heißen und kritischen Stellen ist daher besonders effektiv. Mit „axial" sind Richtungen parallel zur Drehachse des Elektromotors bezeichnet.The heat transfer resistance from the stator to the housing is drastically reduced because of the complete embedding of the stator in the coolant and because of the wetting of the inside of the housing with the coolant. The reason for this is that the stator pack with its particularly hot spots, such as with its axially projecting end windings, completely immersed in the coolant. The cooling of these hot and critical points is therefore particularly effective. With "axial" directions are designated parallel to the axis of rotation of the electric motor.
Vorzugsweise ist das Kühlmittel eine Flüssigkeit, insbesonde- re ein Öl, wie z.B. ein Silikon- oder Mineralöl. Neben der hohen spezifischen Wärmekapazität wirkt dieses in Hinblick auf die spannungsführenden Wickelköpfe vorteilhaft elektrisch isolierend. Alternativ können andere Kühlflüssigkeiten verwendet werden, wie z.B. Kühlflüssigkeiten auf Wasserbasis. Das Kühlmittel kann alternativ ein Kältemittel sein, wie z.B. Freon® R134a. In diesem Fall ist das Kühlmittel ein SoI, das heißt ein Flüssigkeits-/Gasgemisch.Preferably, the coolant is a liquid, in particular an oil, such as a silicone or mineral oil. In addition to the high specific heat capacity, this has an advantageous electrically insulating effect with regard to the live winding ends. Alternatively, other coolants may be used, such as water-based coolants. The coolant may alternatively be a refrigerant such as Freon ® R134a. In this case, the coolant is a sol, that is, a liquid / gas mixture.
Nach einer weiteren Ausführungsform sind im Statorpaket im Wesentlichen axial zur Drehachse des Elektromotors verlaufende Kühlkanäle vorhanden. Dadurch ist in vorteilhafter Weise eine Kühlung im Inneren des Statorpakets möglich.According to a further embodiment, cooling passages extending substantially axially relative to the axis of rotation of the electric motor are provided in the stator core. As a result, cooling in the interior of the stator is possible in an advantageous manner.
Einer weiteren Ausführungsform zufolge weist das Verdichter- System eine Umwälzpumpe für das Kühlmittel auf. Durch die Umwälzung wird eine gleichmäßigere und auch höhere Kühlleistung erzielt .According to another embodiment, the compressor system has a circulation pump for the coolant. By the circulation a more even and also higher cooling achievement is achieved.
Nach einer bevorzugten Ausführungsform ist das Verdichtersys- tem für den bestimmungsgemäßen Einsatz derart installiert, dass die Drehachse des Elektromotors im Wesentlichen in vertikaler Richtung verläuft. Selbiges trifft auf die Kühlkanäle zu. Die vorliegende Anordnung bewirkt, dass sich selbsttätig ein Kühlkreislauf innerhalb der Kühlkammer einstellt. Denn die Erwärmung des Kühlmittels in den jeweiligen Kühlkanälen bewirkt, dass dieses aufsteigt und aus der oberen axialen Stirnseite des Statorpakets herausströmt. Nachströmendes Kühlmittel befördert das erhitzte Kühlmittel zwangläufig zu der im Vergleich zur Kühlmitteltemperatur kalten Gehäuseinnenseite. Die nachfolgende Abkühlung bewirkt eine Erhöhung des spezifischen Gewichts und ein Absinken des Kühlmittels. Am unteren Ende der Kühlkammer angelangt wird das abgekühlte Kühlmittel in Richtung zur axialen unteren Stirnseite desAccording to a preferred embodiment, the compressor system for the intended use is installed such that the axis of rotation of the electric motor extends substantially in the vertical direction. The same applies to the cooling channels. The present arrangement causes self-acting sets a cooling circuit within the cooling chamber. Because the heating of the coolant in the respective cooling channels causes this rises and flows out of the upper axial end face of the stator. Subsequent coolant forcibly conveys the heated coolant to the inside of the housing that is cold compared to the coolant temperature. The subsequent cooling causes an increase in specific gravity and a decrease in the coolant. Arrived at the lower end of the cooling chamber, the cooled coolant is in the direction of the axial lower end of the
Statorpakets angesaugt. Der Kühlkreislauf ist damit geschlossen. Dabei wirkt das die Gehäuseaußenseite umspülende kalte Meerwasser mit typischen Temperaturen im einstelligen Celsius-Bereich als Wärmesenke. Der große Temperaturgradient zwi- sehen erhitztem Kühlmittel und kaltem Meerwasser bewirkt einen großen Wärmestrom vom Kühlmittel über die Gehäusewandung zum Meerwasser.Suction of stator packs. The cooling circuit is closed. At the same time, the cold outside of the outside of the housing, which has typical temperatures in the single-digit Celsius range, acts as a heat sink. The large temperature gradient between see heated coolant and cold sea water causes a large heat flow from the coolant through the housing wall to the sea water.
Zur gezielten Lenkung der sich in der Kühlkammer ausbildenden zirkulierenden Flüssigkeitsströmung können auch Leitbleche z.B. an den axialen Enden des Statorpakets angeordnet sein.For the purpose of directing the circulating liquid flow forming in the cooling chamber, baffles, e.g. be arranged at the axial ends of the stator.
Nach einer weiteren vorteilhaften Ausführungsform weist das Gehäuse eine Gehäuseaußenseite auf, an der eine Vielzahl von Kühlrippen angeordnet ist. Die Kühlrippen bewirken eine erhebliche Vergrößerung der Kühlfläche zum Meerwasser hin. Die vergrößerte Kühlfläche kann, je nach Ausformung und Anzahl der vorhandenen Kühlrippen, ein Vielfaches der sonst vorliegenden Außenfläche des Gehäuses des Verdichtersystems sein. Vorzugsweise weisen die Kühlrippen von der Außenseite des Gehäuses weg.According to a further advantageous embodiment, the housing has an outer housing side, on which a plurality of cooling fins is arranged. The cooling fins cause a significant increase in the cooling surface to the sea water. The enlarged cooling surface may, depending on the shape and number of existing cooling fins, be a multiple of the otherwise existing outer surface of the housing of the compressor system. Preferably, the cooling fins are away from the outside of the housing.
Vorzugsweise weist das Gehäuse eine zylindrische Bauform auf. In diesem Fall weisen die Kühlkörper radial von der Gehäuse- außenseite weg. Mit „radial" sind Richtungen auf die Symmetrieachse des zylindrischen Gehäuses zu und von ihr weg bezeichnet. Typischerweise fällt die Symmetrieachse mit der Drehachse des Elektromotors zusammen. Weitere vorteilhafte Eigenschaften der Erfindung ergeben sich aus deren beispielhafter Erläuterung anhand der Figuren. Es zeigenPreferably, the housing has a cylindrical shape. In this case, the heat sinks are radially away from the outside of the housing. By "radial" are meant directions toward and away from the axis of symmetry of the cylindrical housing, and typically the axis of symmetry coincides with the axis of rotation of the electric motor. Further advantageous features of the invention will become apparent from the exemplification thereof with reference to the figures. Show it
FIG 1 eine Schnittdarstellung eines Verdichtersystems entlang der Drehachse eines Elektromotors und eines Verdichters gemäß einer ersten Ausführungsform der Erfindung,1 is a sectional view of a compressor system along the axis of rotation of an electric motor and a compressor according to a first embodiment of the invention,
FIG 2 eine Schnittdarstellung eines Verdichtersystems ge- maß einer zweiten Ausführungsform der Erfindung,2 shows a sectional view of a compressor system according to a second embodiment of the invention,
FIG 3 eine Schnittdarstellung eines Verdichtersystems gemäß einer dritten Ausführungsform der Erfindung und FIG 4 eine Seitenansicht des Verdichtersystems gemäß FIG 3 entsprechend der in FIG 3 eingezeichneten Blick- richtung IV.3 shows a sectional view of a compressor system according to a third embodiment of the invention and FIG. 4 shows a side view of the compressor system according to FIG. 3 corresponding to the viewing direction IV shown in FIG.
FIG 1 zeigt eine Schnittdarstellung eines Verdichtersystems 1 entlang der Drehachse DA eines Elektromotors 7 und eines Verdichters 8 gemäß einer ersten Ausführungsform der Erfindung.1 shows a sectional view of a compressor system 1 along the axis of rotation DA of an electric motor 7 and a compressor 8 according to a first embodiment of the invention.
Die in den Figuren FIG 1 bis FIG 3 dargestellten Verdichtersysteme sind insbesondere zur Förderung von Gasen und/oder Gas-/Ölgemischen im Offshore-Bereich ausgebildet. Insbesondere ist ein Gehäuse 2 seewasserfest ausgeführt. Das Gehäuse 2 ist vorzugsweise aus Stahl gefertigt und kann zur Vermeidung von Korrosion einen Schutzanstrich aufweisen. Der verwendete Stahl kann alternativ oder zusätzlich ein nichtrostender Stahl sein. Alternativ kann das Gehäuse 2 aus einem seewasserfesten Aluminium hergestellt sein. Vorzugsweise ist das Gehäuse druckdicht ausgeführt, und zwar entsprechend der zum Betrieb des Verdichtersystems 1 vorgesehenen Einsatztiefe unter dem Meerwasserspiegel oder am Meeresgrund. Die druckdichten Anforderungen betreffen nicht nur das Gehäuse 2 selbst, sondern auch Durchführungen im Gehäuse, wie z.B. für Strom- und Steuerungskabel zur Energieversorgung und zur Steuerung und/oder Überwachung des Verdichtersystems 1. Das Gehäuse 2 weist beispielhaft eine Zugangsöffnung 3 für die zu verdichtenden Gase oder Gas-/Ölgemische und eine Ausgangsöffnung 4 für die verdichteten Gase oder Gas-/Ölgemische auf. Es können alternativ auch mehrere Öffnungen 3, 4 vorhan- den sein. An den beiden Öffnungen 3, 4 sind üblicherweise Anschlusselemente, wie z.B. Kupplungen oder Flansche, angebracht, um an diese Leitungsrohre oder Druckschläuche anschließen zu können. Die Anschlusselemente sowie die Leitungsrohre sind hinsichtlich der jeweils geforderten Druck- dichtigkeit in entsprechender Weise technisch robust auszulegen .The compressor systems shown in the figures 1 to 3 are designed in particular for the promotion of gases and / or gas / oil mixtures in the offshore area. In particular, a housing 2 is seawater resistant. The housing 2 is preferably made of steel and may have a protective coating to prevent corrosion. The steel used may alternatively or additionally be a stainless steel. Alternatively, the housing 2 may be made of a seawater resistant aluminum. Preferably, the housing is pressure-tight, in accordance with the intended for operation of the compressor system 1 depth of use under the sea water level or on the seabed. The pressure-tight requirements relate not only to the housing 2 itself, but also implementations in the housing, such as for power and control cables for power supply and for controlling and / or monitoring of the compressor system. 1 The housing 2 has, for example, an access opening 3 for the gases or gas / oil mixtures to be compressed and an outlet opening 4 for the compressed gases or gas / oil mixtures. Alternatively, a plurality of openings 3, 4 may be present. At the two openings 3, 4 are usually connecting elements, such as couplings or flanges, mounted in order to connect to these pipes or pressure hoses. The connection elements and the pipes are to be interpreted in a technically robust manner with respect to the required pressure tightness.
Im Gehäuse 2 ist der Verdichter 8 angeordnet, welcher ein- gangsseitig mit der Zugangsöffnung 3 und ausgangsseitig mit der Ausgangsöffnung 4 verbunden ist. Die im Bereich der Öffnungen 3, 4 dargestellten Pfeile zeigen die Strömungsrichtungen an. Im Beispiel der FIG 1 weist der Verdichter 8 eine Turbine 81 mit nicht weiter bezeichneten Turbinenblättern auf. Deren Durchmesser nimmt in axialer Richtung, das heißt in Strömungsrichtung ab, wobei durch die Verdichtung zugleich der Druck zunimmt. Mit dem Bezugszeichen 83 ist eine Hochdruckausleitung bezeichnet. Von dort aus erfolgt über eine nicht weiter bezeichnete Rohrverbindung im Inneren des Gehäuses 2 der Transport des verdichteten Gases zur Ausgangsöff- nung 3 hin.The compressor 8 is arranged in the housing 2, which is connected on the input side to the access opening 3 and on the output side to the outlet opening 4. The arrows shown in the region of the openings 3, 4 indicate the flow directions. In the example of FIG 1, the compressor 8, a turbine 81 with not further designated turbine blades. Their diameter decreases in the axial direction, that is, in the flow direction, whereby the pressure increases due to the compression at the same time. The reference numeral 83 denotes a high-pressure discharge. From there, the transport of the compressed gas to the outlet opening 3 takes place via a pipe connection (not further described) in the interior of the housing 2.
Im Gehäuse 2 ist weiterhin der Elektromotor 7 zum Antreiben des Verdichters 8 angeordnet. Der Elektromotor 7 weist ein Statorpaket 71 sowie ein Rotorpaket 72 auf. Weiterhin weisen im Beispiel der FIG 1 sowohl der Verdichter 8 als auch derIn the housing 2, the electric motor 7 is further arranged for driving the compressor 8. The electric motor 7 has a stator 71 and a rotor package 72. Furthermore, in the example of FIG 1, both the compressor 8 and the
Elektromotor 7 eine gemeinsame, in Lagern 6 geführte Welle 5 auf .Electric motor 7 a common, guided in bearings 6 shaft 5.
Erfindungsgemäß ist das Statorpaket 71 des Elektromotors 7 über eine Gehäuseinnenseite GI des Gehäuses 2 des Verdichtersystems 1 kühlbar. Im Beispiel der FIG 1 erfolgt die Kühlung über eine Statoraußenseite SA, welche bündig an der Gehäuseinnenseite GI anliegt. Die im Kontaktbereich zwischen Sta- toraußenseite SA und Gehäuseinnenseite GI eingetragenen Pfeile versinnbildlichen den Wärmestrom. Um die Kühlleistung zu erhöhen, kann zwischen der Statoraußenseite SA und der Gehäuseinnenseite GI eine gut wärmeleitfähige Masse eingebracht sein, wie z.B. eine gut wärmeleitende Paste, ein Fett oder dergleichen .According to the invention, the stator 71 of the electric motor 7 can be cooled via a housing inner side GI of the housing 2 of the compressor system 1. In the example of FIG 1, the cooling via a stator outside SA, which rests flush against the inside of the housing GI. In the area of contact between Tor outside SA and housing inside GI registered arrows symbolize the heat flow. In order to increase the cooling capacity, a good heat-conductive mass may be introduced between the stator outside SA and the inside of the housing GI, such as a good heat-conductive paste, a grease or the like.
Das gezeigte Verdichtersystem 1 ist derart installiert, dass die Drehachse DA des Elektromotors 7 im Wesentlichen in ver- tikaler Richtung verläuft. Sie kann alternativ auch in waagrechter Position ausgerichtet sein.The compressor system 1 shown is installed in such a way that the axis of rotation DA of the electric motor 7 extends essentially in the vertical direction. It can alternatively be aligned in a horizontal position.
Des Weiteren weist das Gehäuse 2 eine Gehäuseaußenseite GA, an welcher eine Vielzahl von abstehenden Kühlrippen 21 ange- ordnet ist. Bei dem vorliegenden Fall einer zylindrischen Bauform des Gehäuses 2 weisen die Kühlrippen 21 radial von der Gehäuseaußenseite GA weg. Auch die alternativen Ausführungsformen des Verdichtersystems 1 gemäß FIG 2 und FIG 3 weisen eine derartige zylindrische Bauform auf.Furthermore, the housing 2 has a housing outside GA, on which a plurality of projecting cooling fins 21 is arranged. In the present case of a cylindrical design of the housing 2, the cooling fins 21 are radially away from the housing outside GA. The alternative embodiments of the compressor system 1 according to FIG. 2 and FIG. 3 also have such a cylindrical design.
FIG 2 zeigt eine Schnittdarstellung eines Verdichtersystems 1 gemäß einer zweiten Ausführungsform der Erfindung. Das gezeigte Verdichtersystem 1 ist in Bezug auf die Drehachse DA des Elektromotors 7 wiederum vertikal installiert.2 shows a sectional view of a compressor system 1 according to a second embodiment of the invention. The compressor system 1 shown is in turn vertically installed with respect to the axis of rotation DA of the electric motor 7.
Im Unterschied zur Ausführungsform gemäß FIG 1 ist das Statorpaket 71 von der Innenseite GI des Gehäuses 2 beabstandet. Der mittlere radiale Abstand liegt vorzugsweise in einem Bereich von 5 cm bis 15 cm. Je nach elektrischer Anschlussleis- tung des Elektromotors 7 können die Abstandswerte auch darüber liegen, wie z.B. bei 20 cm, oder darunter liegen, wie z.B. bei 3 cm. Das Statorpaket 71 bildet mit zumindest einem gegenüberliegenden Teil der Gehäuseinnenseite GI eine ringförmige Kühlkammer 9 aus, in welcher ein Kühlmittel 9 vorhan- den ist. In der Kühlkammer 9 liegen auch die Wickelköpfe 73 des Statorpakets 71, welche axial aus dem Statorpaket 71 herausragen. Die Kühlkammer 9 weist im Beispiel der FIG 2 nur eine Kammer auf. Sie kann alternativ mehrere Kammern aufwei- sen, wobei in diesem Fall benachbarte Kammern jeweils durch ein radialaxial verlaufendes Schott von einander getrennt sind.In contrast to the embodiment of FIG 1, the stator 71 is spaced from the inside GI of the housing 2. The mean radial distance is preferably in a range of 5 cm to 15 cm. Depending on the electrical connection power of the electric motor 7, the distance values can also lie above it, such as, for example, at 20 cm or below, for example at 3 cm. The stator core 71 forms with at least one opposite part of the inside of the housing GI an annular cooling chamber 9 in which a coolant 9 is present. In the cooling chamber 9 are also the winding heads 73 of the stator 71, which protrude axially from the stator 71. The cooling chamber 9 has only one chamber in the example of FIG. It can alternatively have several chambers. sen, in which case adjacent chambers are each separated by a radially axially extending bulkhead from each other.
Die Kühlkammer 9 ist durch zwei Reife 91, 92 und eine Kreisscheibe 94 gebildet. Die beiden Reife 91, 92 weisen einen Innendurchmesser auf, der dem Innendurchmesser des Statorpakets 71 entspricht. Der erste Reif 91 ist an einer unteren axialen Stirnseite des Statorpakets 71 abgedichtet angebracht, wie z.B. angeschweißt. Die Symmetrieachse dieses Reifs 91 fluchtet mit der Drehachse DA des Elektromotors 7. Die axiale Höhe des ersten Reifs 91 entspricht nahezu dem axialen Abstand des Statorpakets 71 zu einer Bodenplatte 22 des Gehäuses 2. Der untere Rand des ersten Reifs 91 kann über einen Dichtungsring 93 zur Bodenplatte 22 hin abgedichtet sein oder mit der Bodenplatte 22 dicht verschweißt sein.The cooling chamber 9 is formed by two ripeness 91, 92 and a circular disk 94. The two ripen 91, 92 have an inner diameter which corresponds to the inner diameter of the stator 71. The first hoop 91 is sealed to a lower axial end face of the stator pack 71, such as e.g. welded. The axis of symmetry of this hoop 91 is aligned with the axis of rotation DA of the electric motor 7. The axial height of the first hoop 91 corresponds to almost the axial distance of the stator 71 to a bottom plate 22 of the housing 2. The lower edge of the first hoop 91 can via a sealing ring 93 for Bottom plate 22 to be sealed towards sealed or welded to the bottom plate 22.
Der zweite Reif 92 ist in entsprechender Weise am oberen axialen Ende des Statorpakets 71 angebracht. Die Kreisscheibe 94 weist einen Innendurchmesser auf, der in etwa dem Innendurchmesser der Reife 91, 92 entspricht. Der Außendurchmesser entspricht in etwa dem Innendurchmesser des Gehäuses 2. Der zweite Reif 92 und die Kreisscheibe 94 sind vorzugsweise mit einander dicht verschweißt und bilden gemeinsam einen Flansch 92, 94. Der Außenrand der Kreisscheibe 94 bzw. des Flansches 92, 94 kann über einen weiteren Dichtungsring 95 zur Gehäuseinnenseite GI abgedichtet sein oder mit der Gehäuseinnenseite GI dicht verschweißt sein. Die Reife 91, 92, die Kreischeibe 94, eine radiale Innenseite des Statorpakets 71 und die Gehäuseinnenseite GI bilden somit einen Hohlzylinder .The second hoop 92 is similarly attached to the upper axial end of the stator core 71. The circular disk 94 has an inner diameter which corresponds approximately to the inner diameter of the maturity 91, 92. The outer diameter corresponds approximately to the inner diameter of the housing 2. The second hoop 92 and the circular disk 94 are preferably welded together tightly and together form a flange 92, 94. The outer edge of the circular disk 94 and the flange 92, 94 can via another Gasket 95 may be sealed to the inside of the housing GI or tightly welded to the inside of the housing GI. The maturity 91, 92, the circular disc 94, a radial inner side of the stator packet 71 and the housing inner side GI thus form a hollow cylinder.
In der Kühlkammer 9 ist ein Kühlmittel, vorzugsweise ein Öl, als Kühlflüssigkeit vorhanden. Insbesondere kommt ein sogenanntes Trafoöl auf Mineralölbasis oder Silikonölbasis in Be- tracht . Vorzugsweise ist die gesamte Kühlkammer 9 mit derIn the cooling chamber 9, a coolant, preferably an oil, is present as the cooling fluid. In particular, a so-called transformer oil based on mineral oil or silicone oil is considered. Preferably, the entire cooling chamber 9 with the
Kühlflüssigkeit gefüllt. Im Gehäuse 2 und außerhalb der Kühlkammer 9 kann ein Ausgleichsgefäß für die Kühlflüssigkeit vorhanden sein, um eine temperaturbedingte Volumenänderung des Kühlmittels auszugleichen.Coolant filled. In the housing 2 and outside the cooling chamber 9, a compensating vessel for the cooling liquid be present to compensate for a temperature-induced change in volume of the coolant.
Das Kühlmittel kann alternativ zum Öl auch ein Kältemittel sein, wie z.B. ein Freon®. Besonders vorteilhaft ist hinsichtlich der Umweltverträglichkeit ein FCKW-freies Freon®, wie z.B. Freon® R134a. In diesem Fall ist die Kühlkammer 9 mit einem SoI gefüllt, das heißt mit einem Flüssigkeits- /Gasgemisch.The coolant may be a refrigerant as an alternative to oil, such as Freon ® a. A CFC-free Freon ® is particularly advantageous in terms of environmental compatibility, such as Freon ® R134a. In this case, the cooling chamber 9 is filled with a sol, that is, with a liquid / gas mixture.
Des Weiteren sind im Statorpaket 71 im Wesentlichen axial zur Drehachse DA des Elektromotors 7 verlaufende Kühlkanäle 75 vorhanden. Wegen der Einbettung des Statorpakets 71 in dem Kühlmittel sind diese gleichfalls mit dem Kühlmittel gefüllt. Während des Betriebs des Verdichtersystems 1 stellt sich eine Zirkulation des Kühlmittels in der Kühlkammer 9 ein. Dies ist durch Strömungspfeile dargestellt. Dabei steigt das in den Kühlkanälen 75 erhitzte Kühlmittel nach oben und kühlt sich in umgekehrter Richtung von oben nach unten entlang der kal- ten Gehäuseinnenseite GI wieder ab. Dabei werden die thermisch besonders kritischen Wickelköpfe 73 durch das zirkulierende Kühlmittel umspült und damit wirksam gekühlt.Furthermore, cooling passages 75 extending essentially axially to the axis of rotation DA of the electric motor 7 are present in the stator pack 71. Because of the embedding of the stator 71 in the coolant, these are also filled with the coolant. During operation of the compressor system 1, a circulation of the coolant in the cooling chamber 9 is established. This is represented by flow arrows. In this case, the coolant heated in the cooling channels 75 rises upwards and cools down in the reverse direction from top to bottom along the cold inside of the housing GI. In this case, the thermally particularly critical winding heads 73 are surrounded by the circulating coolant and thus effectively cooled.
Die waagrechten Pfeile symbolisieren den Wärmetransport vom Kühlmittel, weiter über die Wandung des Gehäuses 2 in dasThe horizontal arrows symbolize the heat transfer from the coolant, continue over the wall of the housing 2 in the
Meerwasser, welches die Außenseite GA des Gehäuses 2 umspült. Der sich in der Kühlkammer 9 einstellende Kühlkreislauf kann auch als Primärkühlkreislauf bezeichnet werden, während sich an der Gehäuseaußenseite, allerdings nur im Falle eines ru- henden Gewässers, eine Gegenströmung einstellt, welche von unten nach oben entlang der Gehäuseaußenseite GA entlang streicht. Die Kühlung durch das Meerwasser kann auch als Sekundärkühlung bezeichnet werden.Seawater, which surrounds the outside of the housing 2 GA. The cooling circuit established in the cooling chamber 9 can also be referred to as the primary cooling circuit, while at the outside of the housing, but only in the case of a calming body of water, a counterflow is established which sweeps from the bottom upwards along the exterior of the housing GA. The cooling by the seawater can also be called secondary cooling.
Zur weiteren Steigerung der Kühlleistung kann das Verdichtersystem 1 eine Umwälzpumpe für das Kühlmittel aufweisen. Die Umwälzpumpe ist z.B. eine Kreiselpumpe, welche in oder an der Kühlkammer 9 angebracht ist. Im Vergleich zur FIG 1 sind die Kühlrippen 21 an der Außenseite GA des Gehäuses 2 hinsichtlich ihrer Länge kürzer ausgebildet. Sie erstrecken sich nur in dem axialen „heißen" Bereich des Gehäuses 2, welcher der Kühlkammer 9 gegenüber- liegt. Die Kühlung des Verdichters 8 erfolgt in diesem Zusammenhang über die zu verdichtenden Gase bzw. Gas-/Ölgemische selbst .To further increase the cooling capacity, the compressor system 1 may comprise a circulation pump for the coolant. The circulating pump is, for example, a centrifugal pump which is mounted in or on the cooling chamber 9. Compared to FIG 1, the cooling fins 21 are formed on the outside of the housing 2 GA shorter in length. They extend only in the axial "hot" region of the housing 2, which lies opposite the cooling chamber 9. The cooling of the compressor 8 takes place in this connection via the gases or gas / oil mixtures themselves to be compressed.
FIG 3 zeigt eine Schnittdarstellung eines Verdichtersystems 1 gemäß einer dritten Ausführungsform der Erfindung.3 shows a sectional view of a compressor system 1 according to a third embodiment of the invention.
Im Vergleich zur FIG 2 ist die Kühlkammer 9 im Wesentlichen torusförmig ausgebildet, wobei die Kühlkammer 9 gebogene Kühlkammerwände 96, 97 aufweist, welche durch ihre Formgebung den zirkulierenden Strömungsverlauf begünstigen. Die Kühlleistung dieser Ausführungsform ist daher im Vergleich zur zweiten Ausführungsform bei gleichem Bauvolumen größer. Die Kühlkammerwände 96, 97 erfüllen neben der Ausbildung der Kühlkammer 9 auch eine Strömungsleitfunktion. Mit den Bezugs- zeichen 98, 99 sind weitere Dichtungsringe zur Abdichtung der Kühlkammerwände 96, 97 mit der Gehäuseinnenseite GI bezeichnet. Alternativ können die Kühlkammerwände 96, 97 mit der Gehäuseinnenseite GI dicht verschweißt sein.Compared to FIG 2, the cooling chamber 9 is formed substantially toroidal, wherein the cooling chamber 9 curved cooling chamber walls 96, 97 which favor the circulating flow through their shape. The cooling capacity of this embodiment is therefore larger in comparison to the second embodiment with the same construction volume. The cooling chamber walls 96, 97 fulfill in addition to the formation of the cooling chamber 9 and a Strömungsleitfunktion. With the reference numerals 98, 99 further sealing rings for sealing the cooling chamber walls 96, 97 are designated with the housing inner side GI. Alternatively, the cooling chamber walls 96, 97 may be tightly welded to the inside of the housing GI.
FIG 4 zeigt eine Seitenansicht des Verdichtersystems 1 gemäß FIG 3 entsprechend der in FIG 3 eingezeichneten Blickrichtung IV.4 shows a side view of the compressor system 1 according to FIG. 3 corresponding to the viewing direction IV shown in FIG.
FIG 4 zeigt den Blick in die Zugangsöffnung 3, das heißt in Richtung auf den Verdichter. Wie FIG 4 weiter zeigt, weist das Statorpaket 71 eine Vielzahl in Umfangrichtung gleichmäßig verteilt angeordneter Kühlkanäle 75 auf. Die Kühlkanäle 75 sind hinsichtlich ihrer radialen Lage zu den Wickelköpfe 73 zu beiden Seiten der Wickelköpfe 73 angeordnet (vgl. dazu auch FIG 2 und FIG 3) . Die Anordnung der Kühlkanäle 75 erfolgt vorzugsweise im magnetisch weniger aktiven Bereich des Statorpakets 71. Die Vielzahl von Kühlkanälen 75 ermöglicht eine effektive Kühlung des Statorpakets 71 quasi von innen heraus .4 shows the view into the access opening 3, that is, in the direction of the compressor. As FIG 4 further shows, the stator 71 has a plurality of circumferentially uniformly distributed cooling channels 75 on. The cooling channels 75 are arranged with respect to their radial position to the winding heads 73 on both sides of the winding heads 73 (see also FIG 2 and FIG 3). The arrangement of the cooling channels 75 is preferably carried out in the magnetically less active region of the stator 71. The plurality of cooling channels 75 allows an effective cooling of the stator 71 almost from the inside out.
An der Gehäuseaußenseite GA ist eine Vielzahl von radial von der Gehäuseaußenseite weg weisend angeordneten Kühlrippen 21 zu sehen. Die Kühlrippen 21 bewirken eine drastische Erhöhung der zur Kühlung durch Meerwasser zur Verfügung stehenden Kühlfläche. Vorzugsweise sind die Kühlrippen 21 integraler Bestandteil des Gehäuses 2 des Verdichtersystems 1. Insbeson- dere ist das Gehäuse 2 aus einem Guss gefertigt.On the outer side of the housing GA, a plurality of radially directed from the outside of the housing facing away arranged cooling fins 21 can be seen. The cooling fins 21 cause a drastic increase in the cooling surface available for cooling by seawater. Preferably, the cooling fins 21 are an integral part of the housing 2 of the compressor system 1. In particular, the housing 2 is made of a cast.
Das erfindungsgemäße Verdichtersystem eignet sich auch für schnelllaufende Verdichtersysteme bei Drehzahlen bis zu 15000 U/min und Leistungen von einigen 100 kW bis zu 10 MW und mehr. The compressor system according to the invention is also suitable for high-speed compressor systems at speeds of up to 15,000 rpm and powers of a few 100 kW up to 10 MW and more.

Claims

Patentansprüche claims
1. Verdichtersystem, insbesondere zur Förderung von Gasen oder Gas-/Ölgemischen im Offshore-Bereich, mit - einem seewasserfesten Gehäuse (2) mit zumindest einer Zugangsöffnung (3) für zu verdichtende Gase oder Gas-/Ölge- mische und mit zumindest einer Ausgangsöffnung (4) für die verdichteten Gase oder Gas-/Ölgemische,1. compressor system, in particular for the production of gases or gas / oil mixtures in the offshore sector, comprising - a sea water resistant housing (2) with at least one access opening (3) for gases to be compressed or gas / oil mixtures and with at least one outlet opening (4) for the compressed gases or gas / oil mixtures,
- einem im Gehäuse (2) angeordneten Verdichter (8), welcher eingangsseitig mit der Zugangsöffnung (3) und ausgangssei- tig mit der Ausgangsöffnung (4) verbunden ist unda compressor (8) arranged in the housing (2), which is connected on the input side to the access opening (3) and on the output side to the outlet opening (4), and
- einem im Gehäuse (2) angeordneten Elektromotor (7) mit einem Statorpaket (71) und einem Rotorpaket (72) zum Antreiben des Verdichters (8), d a d u r c h g e k e n n z e i c h n e t, dass das Statorpaket (71) des Elektromotors (7) über eine Innenseite (GI) des Gehäuses (2) des Verdichtersystems kühlbar ist.- One in the housing (2) arranged electric motor (7) with a stator (71) and a rotor core (72) for driving the compressor (8), characterized in that the stator (71) of the electric motor (7) via an inside (GI ) of the housing (2) of the compressor system is coolable.
2. Verdichtersystem nach Anspruch 1, d a d u r c h g e - k e n n z e i c h n e t, dass das Statorpaket (71) eine Statoraußenseite (SA) aufweist, welche zumindest nahezu bündig an der Gehäuseinnenseite (GI) anliegt, und dass zwischen der Statoraußenseite (SA) und der Gehäuseinnenseite (GI) eine gut wärmeleitfähige Masse eingebracht ist.2. Compressor system according to claim 1, dadurchge - indicates that the stator (71) has a Statoraußenseite (SA), which rests at least almost flush on the inside of the housing (GI), and that between the stator outside (SA) and the inside of the housing (GI) a good thermal conductivity mass is introduced.
3. Verdichtersystem nach Anspruch 1, d a d u r c h g e ¬ k e n n z e i c h n e t,3. Compressor system according to claim 1, dadurchge ¬ indicates
- dass das Statorpaket (71) von der Innenseite (GI) des Ge¬ häuses (2) beabstandet ist, - dass das Statorpaket (71) mit zumindest einem gegenüberlie¬ genden Teil der Gehäuseinnenseite (GI) eine ringförmige Kühlkammer (9) ausbildet und- That the stator (71) from the inside (GI) of the Ge ¬ housing (2) is spaced, - that the stator (71) with at least one gegenüberlie ¬ ing part of the housing inner side (GI) forms an annular cooling chamber (9) and
- dass in der Kühlkammer (9) ein Kühlmittel vorhanden ist.- That in the cooling chamber (9), a coolant is present.
4. Verdichtersystem nach Anspruch 3, d a d u r c h g e ¬ k e n n z e i c h n e t, dass das Kühlmittel ein Öl ist. 4. Compressor system according to claim 3, dadurchge ¬ indicates that the coolant is an oil.
5. Verdichtersystem nach Anspruch 3 oder 4, d a d u r c h g e k e n n z e i c h n e t, dass im Statorpaket (71) im Wesentlichen axial zur Drehachse (DA) des Elektromotors (7) verlaufende Kühlkanäle (75) vorhanden sind.5. Compressor system according to claim 3 or 4, characterized in that in the stator (71) substantially axially to the axis of rotation (DA) of the electric motor (7) extending cooling channels (75) are present.
6. Verdichtersystem nach einem der Ansprüche 3 bis 5, d a d u r c h g e k e n n z e i c h n e t, dass das Verdichtersystem eine Umwälzpumpe für das Kühlmittel aufweist.6. The compressor system according to claim 3, wherein the compressor system has a circulation pump for the coolant.
7. Verdichtersystem nach einem der vorangegangenen Ansprüche, d a d u r c h g e k e n n z e i c h n e t, dass das Verdichtersystem im bestimmungsgemäßen Einsatz derart installiert ist, dass die Drehachse (DA) des Elektromotors (7) im Wesentlichen in vertikaler Richtung verläuft.7. The compressor system according to claim 1, wherein the compressor system is installed in the intended use such that the axis of rotation (DA) of the electric motor (7) runs essentially in the vertical direction.
8. Verdichtersystem nach einem der vorangegangenen Ansprüche, d a d u r c h g e k e n n z e i c h n e t, dass das Gehäuse (2) eine Gehäuseaußenseite (GA) aufweist und dass an der Gehäuseaußenseite (GA) eine Vielzahl von Kühlrippen (21) an- geordnet ist. 8. Compressor system according to one of the preceding claims, in that the housing (2) has a housing outside (GA) and that on the outside of the housing (GA) a plurality of cooling fins (21) is arranged.
EP08759450.3A 2007-05-09 2008-05-07 Compressor system for underwater use in the offshore area Active EP2142806B1 (en)

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DE102007021720.1A DE102007021720B4 (en) 2007-05-09 2007-05-09 Compressor system for underwater use in the offshore sector
PCT/EP2008/055629 WO2008138829A1 (en) 2007-05-09 2008-05-07 Compressor system for underwater use in the offshore area

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WO2008138829A1 (en) 2008-11-20
DE102007021720B4 (en) 2014-01-23
BRPI0811221A2 (en) 2014-10-29
CN101675249A (en) 2010-03-17
US8313316B2 (en) 2012-11-20
RU2470190C2 (en) 2012-12-20
RU2009145531A (en) 2011-06-20
CA2686794A1 (en) 2008-11-20
EP2142806B1 (en) 2018-02-28
US20100239441A1 (en) 2010-09-23
BRPI0811221B1 (en) 2019-09-03
CN101675249B (en) 2013-01-09
DE102007021720A1 (en) 2008-11-13

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