AU2015363802B2 - Centrifugal pressure booster and method for modifying or constructing a centrifugal pressure booster - Google Patents

Centrifugal pressure booster and method for modifying or constructing a centrifugal pressure booster Download PDF

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Publication number
AU2015363802B2
AU2015363802B2 AU2015363802A AU2015363802A AU2015363802B2 AU 2015363802 B2 AU2015363802 B2 AU 2015363802B2 AU 2015363802 A AU2015363802 A AU 2015363802A AU 2015363802 A AU2015363802 A AU 2015363802A AU 2015363802 B2 AU2015363802 B2 AU 2015363802B2
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Prior art keywords
rotor
pressure booster
gap
stator gap
pressure
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AU2015363802A1 (en
Inventor
Age Hofstad
Tarje Olderheim
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Aker Solutions AS
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Aker Solutions AS
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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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0653—Units comprising pumps and their driving means the pump being electrically driven the motor being flooded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more 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
    • 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
    • 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
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • 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
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • 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
    • F04D29/18—Rotors
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid 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
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Abstract

The invention provides a centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, and at least one housing, one fluid inlet and one fluid outlet. The pressure booster is distinctive in that it comprises a rotor stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap. The invention also provides a related method and use of a rotor stator gap coolant inlet pump.

Description

CENTRIFUGAL PRESSURE BOOSTER AND METHOD FOR MODIFYING OR CONSTRUCTING A CENTRIFUGAL PRESSURE BOOSTER
Field of the invention
The invention relates to centrifugal pumps and compressors, for convenience also termed pressure boosters in this document. More specifically, the invention relates to improved cooling of a pressure booster, which enhances the maximum power and speed and prolong the service life of the pressure booster.
Background of the invention and prior art
Improved cooling of pressure boosters, providing enhanced maximum power and speed and prolonged service life, is of general interest for users of pressure boosters, particularly users of subsea pressure boosters. However, numerous special challenges related to subsea pressure boosting limit the use. Subsea pressure boosting of liquids, multiphase fluid or gas is of great interest for the petroleum industry, due to the huge possibilities made available for the industry. Subsea pressure boosting can increase the production significantly from subsea wells, both the recovery and the production rate, and allow transport of the produced petroleum fluid, processed or unprocessed, to remote onshore or platform locations. Two major challenges for subsea pressure boosting are to improve reliability and to increase the maximum power and speed of the subsea pressure booster.
Motors for pumps or compressors are normally liquid filled. A large friction loss in the gap between the rotor and the stator, especially at high speeds, restricts the rotation of the rotor. The friction in general follows a power of three of the velocity. The friction generates heat, restricting the maximum power rating and rotations per minute and shortening the service life of the pressure booster. Current practice is to flush a coolant through the gap in order to limit the temperature rise due to the friction, using a common coolant circulation pump serving cooling of the stator windings and the rotor stator gap. More specifically, a single coolant pump flush coolant through the rotor stator gap and also
2015363802 11 Mar 2019 through coolant conduits through or between the stator windings, the flow through the rotor-stator gap and the stator windings conduits being arranged in parallel.
A first known solution to increase the rotor stator gap cooling is to increase the rotor stator gap distance, thereby reducing the resistance for coolant flow. However, this will reduce the efficiency of the magnetic coupling and hence also the motor efficiency. A second known solution to increase rotor stator gap cooling is to add or integrate vanes on the rotor, in the rotor stator gap.
Reference is made to the patent publications GB2497667, US2001051097, JPH11230088, JPH1189180 and JP4770441. The teaching of the referred publications is in general unsuitable for the surface speeds related to the current invention.
It is desirable to provide enhanced maximum power and speed and prolong the service life of a pressure booster. None of the publications mentioned above describes or illustrates an improved or alternative cooling in a centrifugal pressure booster as a means to meet said desire.
The term ‘comprise’ and variants of the term such as ‘comprises’ or ‘comprising’ are used herein to denote the inclusion of a stated integer or stated integers but not to exclude any other integer or any other integers, unless in the context or usage an exclusive interpretation of the term is required.
Any reference to publications cited in this specification is not an admission that the disclosures constitute common general knowledge.
Summary of the invention
The invention provides a centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, and at least one housing, one fluid inlet and one fluid outlet. The pressure booster is distinctive in that it comprises a rotor
2015363802 11 Mar 2019 stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap.
Preferably, the pressure booster is a subsea pressure booster, further 5 comprising at least one pressure housing and a coolant circulation pump arranged for pumping coolant through said gap and channels through the stator.
In a preferable embodiment, said inlet pump is an impeller fastened to and arranged as an axial extension to laminations or a short circuiting ring of the rotor. In an alternative preferable embodiment, said inlet pump comprises angled blades or vanes fastened to and arranged as an axial extension to laminations or a short circuiting ring of the rotor, or arranged on a rotor shaft adjacent the rotor stator gap.
Preferably, the rotor stator gap coolant inlet pump is a combined balancing ring and impeller, having outer diameter larger than the inner diameter of the rotor stator gap but smaller than the outer diameter of the rotor stator gap, said combined balancing ring and impeller has outlet for coolant directly into the rotor stator gap. However, the outer impeller diameter can be larger than the outer diameter of the rotor stator gap, if a slightly larger diameter external cover or similar directs the flow into the rotor stator gap. Alternatively, the impeller outer diameter can be smaller than the inner diameter of the rotor stator gap, if an external cover or similar directs the flow into the rotor stator gap, which can be a favourable embodiment if cavitation is a possible problem. For state of the art pressure boosters with a common shaft for rotor/ motor and pump, the balancing device and impeller is ring shaped. A balancing device, also called balance device, balance ring or balance disc, is used to minimize vibrations and any other possible effects by small misalignments on the shaft where it is attached, by fine tuning weight or extent of material around the rotational axis.
The invention also provides a method for modifying or constructing a centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or gas. For the method, the pressure booster comprises a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a
2015363802 11 Mar 2019 pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, one fluid inlet and one fluid outlet, and at least one pressure housing if the pressure booster is for subsea operation. The method is distinctive by providing the pressure booster with a rotor stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap.
Preferably, a combined balancing ring and impeller is arranged as the rotor stator gap inlet pump, preferably having outer diameter larger than the inner diameter of the rotor stator gap but smaller than the outer diameter of the rotor stator gap, said combined balancing ring and impeller being arranged having outlet directly into the rotor stator gap and preferably it is fastened to and arranged as an extension to laminations or a short-circuiting ring of the rotor, as a ring on a rotor shaft.
The invention also provides use of a rotor stator gap coolant inlet pump in a pressure booster, preferably a subsea pressure booster, for enhancing the coolant flow through a rotor stator gap of the pressure booster.
The invention provides balancing of the flow rate through the stator windings and the rotor-stator gap, which will have very different frictional characteristics and hence different pressure drops. The invention ensures that at all relevant rotational speeds, both the stator windings and the rotor-stator gap have sufficient liquid coolant flow, providing enhanced maximum power and speed and prolonged service life of the pressure booster of the invention. Said inlet pump rotates with the rotor, without disturbing the rotor stator gap flow by increasing the friction, thereby solving what is assumed to be a major problem with prior art devices with vanes in all of or at least in a significant length along the rotor stator gap.
The term a “rotor stator gap coolant inlet pump”, in this context means vanes or blades or similar structural elements arranged at the motor stator gap inlet, as well as impellers with at least one blade, arranged not into the motor stator gap as seen in radial direction, but at the inlet thereof, just outside the gap. This means that the coolant flow exits directly from the outlet of said inlet pump into
2015363802 11 Mar 2019 said gap inlet and said inlet pump is arranged adjacent to said gap, which is just besides the radial motor stator gap without any significant axial distance between, for enhancing the coolant flow through the rotor stator gap. Axial means parallel to the rotor rotation axis, radial means radial to the rotor rotation axis.
With the term an “impeller”, it is in this context meant a device typically having a radial fluid displacement component upon rotation, as provided by having at least one blade or fluid conduit. The fluid inlet of an impeller typically is nearer the rotation axis than the fluid outlet. With the terms a “blade” or “vane” it is meant an axial fluid displacement component shaped as a blade or similar, as seen in the prior art publications, but for the present invention not arranged in the rotor stator gap. The rotor stator gap coolant inlet pump may however comprise elements of any operative kind providing pumping effect when rotating.
As skilled persons may realize, the coolant of the motor of the pressure boosters of the invention is a liquid, the rotor stator gap has in substance smooth, even surfaces, without rotor blades as seen in prior art solutions, and the pressure booster typically operates at high speed and power, such as 20006000 rpm (rotations per minute) and power counted in megawatts.
The blades or vanes are angled or skew in order to provide pumping effect upon rotation. Preferably, the blades are optimized with respect to shape and number for sufficient pumping effect at the intended operating conditions, such as a rotation speed of 6000 rpm. The at least one blade is made with an angle to the tangential direction, so upon rotating the pump or impeller device, as attached to the rotor laminations or rotor shaft or both, a predictable coolant flow component parallel to the rotation axis is generated, enhancing coolant flow through the rotor stator gap.
Without wishing to be bound by theory, it is assumed that the prior art solution of arranging vanes in the rotor stator gap dramatically increases the friction.
2015363802 11 Mar 2019
Accordingly, the flow resistance and heat generation in the rotor stator gap become very high with the state of the art solutions.
The solution of the present invention is also much simpler than the prior art 5 solution with respect to machining and installation. For the most preferred embodiment, a combined balancing ring and impeller will preferably be made by a special wear resistant steel or brass or alloy or other material more resistant to wear and preferably also more feasible for machining and fabrication, than the rotor shaft and laminations.
The invention assures a steady flow of coolant through the rotor stator gap, which better will remove the frictional heat in the gap. This provides a prolonged lifetime of the motor, enhanced power rating and maximum rpm for the pressure booster, and simplifies the fabrication, installation and maintenance of the pressure booster compared to having blades in the whole or a significant length of the rotor stator gap.
The invention also provides a centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, and at least one housing, one fluid inlet and one fluid outlet, characterised in that the pressure booster comprises a rotor stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap, and wherein said inlet pump is an impeller fastened to and arranged as an axial extension to laminations or a short circuiting ring of the rotor.
The invention also provides a method for modifying or constructing a centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, one fluid inlet and one fluid outlet, and at least one pressure housing if the pressure
2015363802 11 Mar 2019 booster is for subsea operation, characterised by providing the pressure booster with a rotor stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap, and whereby a combined balancing ring and impeller is arranged as the rotor stator gap inlet pump, having outer diameter larger than the inner diameter of the rotor stator gap but smaller than the outer diameter of the rotor stator gap, said combined balancing ring and impeller being arranged having outlet directly into the rotor stator gap.
Figures
Figure 1 illustrates a subsea pressure booster of the invention, with a combined balancing device and rotor stator gap circulation impeller.
Figure 2 is an illustration of a detail of a subsea pressure booster of the invention.
Detailed description
Reference is made to Fig. 1, illustrating, in longitudinal section, a subsea pressure booster 1 of the invention, with a combined balancing device and rotor stator gap circulation impeller 2. Figure 2 illustrates the motor part of the subsea pressure booster of Fig. 1 in more detail. Accordingly, in the illustrated embodiment, the rotor stator gap coolant inlet pump is a combined impeller and balancing device. In some otherwise identical or similar embodiments, the rotor stator gap coolant inlet pump is not a combined impeller and balancing device. Figure 2 illustrates the impeller 2 in detail, and it can be seen clearly that the impeller comprises a number of blades 2b. The impeller is fastened to the rotor
3 at the inlet of the rotor stator gap, as an axial extension of the rotor laminations/short circuit ring. The impeller has outer diameter just smaller than the outer diameter of the rotor stator gap, to ensure clearance at different temperatures. The outlet outer diameter of the impeller hub, not the blades, is identical to the outer diameter of the short circuiting ring and rotor laminations.
Around the rotor 3 is a stator 5, between the rotor and stator is the rotor stator gap 6, which is an annular volume with smooth radial inside and outside surfaces, without vanes increasing the friction for flow. Furthermore, the figure illustrates a coolant circulation pump 7 arranged for pumping coolant through said gap and stator channels, in the form of a common circulation impeller 7
2015363802 11 Mar 2019 feeding both stator channel and rotor stator gap coolant flow. A common, prior art type circulation impeller 7 is illustrated, and the rotor stator gap cooling flow 8 and the stator channels cooling flow 9.
The centrifugal subsea pressure booster of the invention can include any feature or step as here illustrated or described, in any operative combination, each such combination is an embodiment of the invention. The method of the invention can include any feature or step as here illustrated or described, in any operative combination, each such combination is an embodiment of the invention. The use of the invention can include any feature or step as here illustrated or described, in any operative combination, each such combination is an embodiment of the invention.

Claims (6)

1.
Centrifugal pressure booster, for pressure boosting liquids, multiphase fluid or 5 gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, and at least one housing, one fluid inlet and one fluid outlet, characterised in that the pressure booster comprises a rotor stator
10 gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap, and wherein said inlet pump is an impeller fastened to and arranged as an axial extension to laminations or a short circuiting ring of the rotor.
2.
15 Pressure booster according to claim 1, wherein the pressure booster is a subsea pressure booster for pressure boosting liquids, multiphase fluid or gas at subsea locations, the pressure booster further comprising at least one pressure housing and a coolant circulation pump arranged for pumping coolant through said gap and stator channels.
3.
Pressure booster according to claim 1 or 2, wherein said inlet pump comprises angled blades or vanes fastened to and arranged as an axial extension to laminations or a short circuiting ring of the rotor, or arranged on a rotor shaft
25 adjacent the rotor stator gap.
4.
Pressure booster according to claim 1 or 2, wherein the rotor stator gap coolant inlet pump is a combined balancing ring and impeller, having outer diameter
30 larger than the inner diameter of the rotor stator gap but smaller than the outer diameter of the rotor stator gap, said combined balancing ring and impeller has
2015363802 11 Mar 2019 outlet for coolant directly into the rotor stator gap.
5.
Method for modifying or constructing a centrifugal pressure booster, for 5 pressure boosting liquids, multiphase fluid or gas, the pressure booster comprising a liquid filled electric motor with a stator and a rotor, with a rotor stator gap between the rotor and stator, a pressure boosting part in the form of a pump or compressor operatively coupled to the rotor, one fluid inlet and one fluid outlet, and at least one pressure housing if the pressure booster is for
10 subsea operation, characterised by providing the pressure booster with a rotor stator gap coolant inlet pump, for enhancing the coolant flow through the rotor stator gap, and whereby a combined balancing ring and impeller is arranged as the rotor stator gap inlet pump, having outer diameter larger than the inner diameter of the rotor stator gap but smaller than the outer
15 diameter of the rotor stator gap, said combined balancing ring and impeller being arranged having outlet directly into the rotor stator gap.
6.
Method according to claim 5, whereby the impeller is fastened to and arranged
20 as an extension to laminations or a short-circuiting ring of the rotor, as a ring on a rotor shaft.
AU2015363802A 2014-12-16 2015-12-15 Centrifugal pressure booster and method for modifying or constructing a centrifugal pressure booster Active AU2015363802B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20141512 2014-12-16
NO20141512A NO339417B1 (en) 2014-12-16 2014-12-16 Centrifugal Pressure Amplifier and Method of Modifying or Constructing a Centrifugal Pressure Amplifier
PCT/NO2015/050245 WO2016099283A1 (en) 2014-12-16 2015-12-15 Centrifugal pressure booster and method for modifying or constructing a centrifugal pressure booster

Publications (2)

Publication Number Publication Date
AU2015363802A1 AU2015363802A1 (en) 2017-07-06
AU2015363802B2 true AU2015363802B2 (en) 2019-03-28

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US (1) US20170261004A1 (en)
AU (1) AU2015363802B2 (en)
BR (1) BR112017011745B1 (en)
GB (1) GB2547611B (en)
NO (1) NO339417B1 (en)
WO (1) WO2016099283A1 (en)

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US20220252070A1 (en) * 2021-02-09 2022-08-11 Onesubsea Ip Uk Limited Subsea electric fluid processing machine
US20220252071A1 (en) * 2021-02-09 2022-08-11 Onesubsea Ip Uk Limited Subsea electric fluid processing machine
CN114526244B (en) * 2022-01-26 2023-06-27 清华大学 Shielded rotary fluid machine
CN114992017B (en) * 2022-06-20 2023-11-24 青岛双瑞海洋环境工程股份有限公司 Heat exchange supercharging device, system and method of marine ammonia fuel supply system

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US20170261004A1 (en) 2017-09-14
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GB2547611A (en) 2017-08-23
AU2015363802A1 (en) 2017-07-06
NO20141512A1 (en) 2016-06-17
NO339417B1 (en) 2016-12-12
GB2547611B (en) 2020-08-19
WO2016099283A1 (en) 2016-06-23

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