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
  • F04D29/00—Details, component parts, or accessories
  • F04D29/60—Mounting; Assembling; Disassembling
  • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
• • 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
  • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
  • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps

Definitions

• the invention relates to a compressor unit, in particular for underwater operation, comprising a compressor and an electric motor, which compressor unit has a housing with an inlet and an outlet for a pumped medium, with an axis of rotation about which a rotor of the compressor unit is rotatable.
• an assembly method for a compressor unit according to the invention is the subject of the invention.
• the compressed medium to be compressed in particular natural gas to be conveyed, not only has a frequently varying aggressive chemical composition, but is also a carrier of various condensates, which complicate the compression, in particular lead to increased wear of the compressor. For this reason, a condensate separation takes place before the compression. Even with the most expensive separation technology, it is not possible to prevent a subsequent separation of condensate in the compressor unit, which can affect at least the service life of a compressor unit. In the case of a compressor unit operated under water, there is also the problem that a connection which regularly takes place at the operating location of the conveying medium and discharging lines and the ambient medium, for example aggressive seawater, can already enter the compressor unit on the transport path and damage there can lead .
• the invention has set itself the task of eliminating the damage potential of condensates and other liquids in a particular intended for underwater operation compressor unit.
• a key advantage of the combination of the vertical installation with a drainage at the lower axial end of the housing is that on the one hand due to the elongated extent along the axis of rotation particularly favorable conditions of drainage arise because higher hydrostatic pressures are due to the higher water column, which ensure a better drainage of the condensates from the housing. As a result, also flow through the drainage located at the lower axial end of the housing condensate driven by the higher hydrostatic pressure due to the vertical orientation better.
• the surfaces in the interior of the compressor unit are designed in such a way that in the case of vertical alignment for operation inside the machine
• housing fluids flowing due to gravity flowing to achieve the drainage For this purpose, the surfaces facing away from the drainage should have a slope, which has a flow for drainage result.
• suitable undercuts with respect to the drainage are inventively not provided inside the housing.
• a pump is connected to the drainage designed as an opening, which dissipates the condensate.
• the housing of the compressor unit is mounted in a frame by means provided on the housing support members, which storage is designed such that the housing is rotatable about a horizontal axis in the region of the rotor's center of gravity, and so the drainage from a low point at a high point to frame rotation.
• This development of the invention is particularly useful when an assembly process for a submerged to be operated compressor unit provides that the compressor unit is filled before lowering to the operating site under water with an incompressible fluid, then transported to the submerged location and operating the Terminals are connected to the inlet and the outlet and finally the compressor unit is drained of the fluid by the drainage.
• the inlet and the outlet are closed over water, before the incompressible fluid is filled and these closures are removed before the ports are connected to the inlet and the outlet.
• this is rotated about a horizontal axis, as described above, so that drainage is located at the upper axial end.
• a complete filling of the housing with the incompressible fluid can take place, in particular if the interior of the housing is designed such that in operation liquids flowing entirely by gravity can reach the drainage and the compressor unit is filled with the lower one axial end is located above.
• the corresponding inclination of the surfaces ensures that when filled with the incompressible fluid can not hold compressible gas bubbles in the housing.
• distilled water or demineralized water may serve as the incompressible fluid, so that the interior of the compressor unit is not exposed to the damaging influence of the ambient medium, for example seawater, and at the same time, the inlet and outlet closures are unaffected during the transport of the compressor unit to the underwater operating location special pressure load must withstand.
• Closing the inlet and outlet of the filled housing is also useful so that no fish swim into the compressor unit and crabs do not crawl into it.
• Figure 1 is a schematic representation of a
• Figure 2, 3 are each a schematic representation of process steps of the mounting method according to the invention.
• Figure 1 shows a section along a compressor unit 1 according to the invention, which has as essential components a motor 2 and a compressor 3 in a gas-tight housing 4.
• the housing 4 accommodates the engine 2 and the compressor 3.
• the housing 4 is provided with an inlet 6 and an outlet 7, through the inlet 6 by means of an intake 8 to be compressed Fluid is sucked and flows through the outlet 7, the compressed fluid.
• the compressor unit 1 is arranged vertically in operation, wherein a motor rotor 15 of the motor 2 are combined via a compressor rotor 9 of the compressor 3 forming a common shaft 19 which rotates about a common vertical axis of rotation 60.
• the motor rotor 15 is mounted in a first radial bearing 21 at the upper end of the motor rotor 15.
• the compressor rotor 9 is mounted in a second radial bearing 22 in the lower position.
• a thrust bearing 25 is provided at the upper end of the common shaft 19 so at the upper end of the motor rotor 15.
• the radial bearings 21, 22 and the thrust bearing 25 operate electromagnetically and are each carried out encapsulated.
• the radial bearings 21, 22 extend in this case in the circumferential direction about the respective bearing point of the shaft 19 and are in this case formed 360 ° circumferentially and undivided.
• the compressor 3 designed as a centrifugal compressor has three compressor stages 11 which are in each case connected by means of an overflow 33.
• the to the Compressor stages 11 resulting pressure differences provide thrust to the compressor rotor 9, which transmits via the clutch 18 on the motor rotor 15 and against the weight of the resulting entire rotor of the compressor rotor 9 and motor rotor 15, is directed so that in nominal operation as far as possible thrust balance he follows.
• the thrust bearing 25 can be dimensioned comparatively smaller than in a horizontal arrangement.
• the electromagnetic bearings 21, 22, 25 are cooled by means of a cooling system 31 to operating temperature, wherein the cooling system 31 provides a tap 32 in an overflow of the compressor 3. From the tap 32 is a part of the pumped medium, which is preferably natural gas, passed through a filter 35 and then passed through two separate pipes to the respective outer bearing points (first radial bearing 21 and second radial bearing 22 and thrust bearing 25) by means of piping.
• This cooling by means of the cold pumped medium saves additional supply lines.
• the motor rotor 15 is surrounded by a stator 16, which has an encapsulation 39, so that the aggressive conveying medium does not damage windings of the stator 16.
• the encapsulation 39 is preferably designed so that it can bear the full operating pressure. This is also because a separate stator cooling 40 is provided, which promotes its own cooling medium 41 via a heat exchanger 43 by means of a pump 42.
• At least the encapsulation 39 is designed such that the portion which extends between the stator 16 and the motor rotor 15 has a thin wall thickness, however, is able to withstand the exhaust pressure when the stator cooling 40 is completely filled by means of the cooling medium 41 , In this way, larger eddy current losses are avoided in this area and the efficiency of the overall arrangement improves.
• the compressor rotor 9 expediently has a compressor shaft 10 on which the individual compressor stages 11 are mounted. This can preferably be done by means of a thermal shrinkage fit. Likewise, a positive connection, for example by means of polygons possible. Another embodiment provides for a fusion of different compressor stages 11 to each other, from which a one-piece compressor rotor 9 results.
• Dewatering point SDP at which a drainage 64 is in the form of an opening of the housing 4.
• a drainage 64 is in the form of an opening of the housing 4.
• all the liquid that is inside the casing 4 collects due to gravity only.
• all the surfaces inside the compressor unit are designed such that, when the operating direction is vertical, the inclination 65 of the surfaces reliably prevents the accumulation of liquid except at the dewatering point.
• a condensate pump 67 is connected, which dissipates the accumulating liquid.
• a condensate pump 67 is connected, which dissipates the accumulating liquid.
• supporting elements 69 are provided on the housing, which offer the possibilities for attaching stop means to stop points.
• a receptacle in a frame 70 is possible, as shown in Figures 2 and 3.
• the receptacle in the frame 70 is designed such that a rotation of the compressor unit 1 about a horizontal axis is possible. In this way, the drainage 64 can be rotated from the lowest point according to the vertical operating orientation to the uppermost point.
• the assembly method according to the invention provides that in a first step, the compressor unit 1 in the frame 70 mirror image of the operating position with the drainage 64 upwards in the vertical orientation of Rotary axis 60 is oriented. In this position, filling the compressor unit 1 by means of an incompressible fluid 82, namely by means of distilled or demineralized water takes place under closure of the inlet 6 and the outlet 7. Subsequently, the
• Compressor unit 1 is rotated back to the operating position and transported under water to the operating site. Finally, with removal of the closures of the inlet 6 and the outlet 7, a respective line 80, 81 connected for a pumped medium and there is a connection of the condensate pump 67 followed by condensate collection 80 to the drainage 64. Before commissioning the compressor unit 1, the fluid filling of the condensate pump 67 pumped from the interior of the compressor unit 1.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Compressor (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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ID=38068454

Family Applications (1)

Country Status (10)

Families Citing this family (16)

Family Cites Families (21)

• 2007
  • 2007-03-22 AT AT07727244T patent/ATE507396T1/de active
  • 2007-03-22 BR BRPI0709151-6A patent/BRPI0709151A2/pt not_active Application Discontinuation
  • 2007-03-22 US US12/225,520 patent/US8714910B2/en not_active Expired - Fee Related
  • 2007-03-22 EP EP07727244A patent/EP1999380B1/fr not_active Not-in-force
  • 2007-03-22 WO PCT/EP2007/052770 patent/WO2007110378A1/fr active Application Filing
  • 2007-03-22 DE DE502007007058T patent/DE502007007058D1/de active Active
  • 2007-03-22 ES ES07727244T patent/ES2364680T3/es active Active
  • 2007-03-22 RU RU2008142116/06A patent/RU2409770C2/ru not_active IP Right Cessation
  • 2007-03-22 CN CN200780010582XA patent/CN101410628B/zh not_active Expired - Fee Related
• 2008
  • 2008-10-21 NO NO20084423A patent/NO339915B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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