US20190242500A9 - Double skinned pipe assembly - Google Patents
Double skinned pipe assembly Download PDFInfo
- Publication number
- US20190242500A9 US20190242500A9 US15/430,763 US201715430763A US2019242500A9 US 20190242500 A9 US20190242500 A9 US 20190242500A9 US 201715430763 A US201715430763 A US 201715430763A US 2019242500 A9 US2019242500 A9 US 2019242500A9
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- United States
- Prior art keywords
- sleeve
- pipe
- outer pipe
- double skinned
- assembly
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
- F16L41/082—Non-disconnectible joints, e.g. soldered, adhesive or caulked joints
- F16L41/084—Soldered joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
- F16L9/19—Multi-channel pipes or pipe assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/06—Fluid supply conduits to nozzles or the like
- F01D9/065—Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/20—Double-walled hoses, i.e. two concentric hoses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/32—Application in turbines in gas turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/231—Preventing heat transfer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/98—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/30—Detecting leaks
Definitions
- the invention relates to a double skinned pipe assembly and more particularly to accessibility to joins between an end of such an assembly and a surface of a body fed or scavenged by the pipe.
- Double skinned pipe assemblies are known. Commonly, they comprise of an inner pipe containing a first fluid and an outer pipe containing a second fluid in an annular space encircling the inner pipe.
- the second fluid is typically air and the annular space serves to contain any fluid leaking from a crack in a wall of the inner pipe.
- Such pipes typically form part of a long supply line. They are often segmented and connected by suitably designed couplings and can thus be disassembled and reassembled without issue.
- a double skinned pipe assembly comprising;
- an inner pipe and an outer pipe enclosing the inner pipe and defining an annular space between the inner pipe and the outer pipe; a sleeve configured to slip over the outer pipe; complementary threads on an outer wall of the outer pipe and an inner wall of the sleeve; and a lock for locking the sleeve in position over the outer pipe when the complementary threads of the outer pipe and sleeve are engaged, wherein the configuration of the assembly is such that, in use, the sleeve is slidable between a first position where the inner pipe may be accessed and a second position wherein the inner pipe is completely enclosed.
- the pipe may be an oil feed pipe or an oil scavenge pipe.
- the lock may comprise a locking nut which includes a thread which is complementary to the thread on the outer pipe and is arranged to be threaded onto the outer pipe after the sleeve has been threaded onto the outer pipe.
- the lock may further include a tab washer arranged between a locking nut and the sleeve and receivable in a tab washer groove provided in a mid-portion of the thread, wherein once the sleeve and locking nut are arranged for locking, the tabs of the washer can be bent and engage with the nut and or sleeve to restrict axial and/or rotational movement thereof.
- the sleeve locks up against the lock nut, such that the pipe itself is not torque loaded.
- the lock may comprise a clamp engageable around the outer pipe and optionally also the sleeve.
- the lock may be incorporated into the sleeve and/or the outer pipe.
- the sleeve might incorporate a ratchet.
- the outer pipe may include an anti-rotation feature engaged by the sleeve when fully engaged to close the access space.
- the outer pipe may include a flange against which the sleeve may abut when the sleeve is in the second position.
- the outer pipe may comprise a plurality of substantially equally spaced radially outward protrusions against which the sleeve may abut when the sleeve is in the second position.
- the inner pipe may be welded at a junction with a body into which the inner pipe feeds.
- the body may be the hub of a bearing structure in a gas turbine engine.
- the sleeve may pass through an orifice in a structure and a seal ring may be provided around the outer pipe.
- the sleeve when the assembly is installed to feed into a body, the sleeve can be slid up and down to allow access to the joint between the inner pipe and the body. Because it is adjustable it can also easily take tolerances into account and hence provides protection of the maximum extent possible.
- Embodiments of the invention provide protection over the maximum length of the inner pipe without over constraining the assembly.
- the inner pipe can be joined to the body using conventional joining processes.
- the adjustable sleeve allows access to inspect the join and to check for leakage from the join or inner pipe. Because the sleeve is adjustable, manufacturing tolerances can be corrected ensuring that the inner pipe can be enclosed over its entire length.
- FIG. 1 shows a section through a gas turbine engine as is known from the prior art and into which a double skinned pipe assembly of the invention might be incorporated;
- FIG. 2 shows an embodiment of a double skinned pipe assembly in accordance with the invention where the inner pipe is accessible
- FIG. 3 shows the embodiment of FIG. 2 where the inner pipe is fully enclosed.
- a gas turbine engine is generally indicated at 10 , having a principal and rotational axis 11 .
- the engine 10 comprises, in axial flow series, an air intake 12 , a propulsive fan 13 , a high-pressure compressor 14 , combustion equipment 15 , a high-pressure turbine 16 , a low-pressure turbine 17 and an exhaust nozzle 18 .
- a nacelle 20 generally surrounds the engine 10 and defines the intake 12 .
- the gas turbine engine 10 works in the conventional manner so that air entering the intake 12 is accelerated by the fan 13 to produce two air flows: a first air flow into the high-pressure compressor 14 and a second air flow which passes through a bypass duct 21 to provide propulsive thrust.
- the high-pressure compressor 14 compresses the air flow directed into it before delivering that air to the combustion equipment 15 .
- the air flow is mixed with fuel and the mixture combusted.
- the resultant hot combustion products then expand through, and thereby drive the high and low-pressure turbines 16 , 17 before being exhausted through the nozzle 18 to provide additional propulsive thrust.
- the high 16 and low 17 pressure turbines drive respectively the high pressure compressor 14 and the fan 13 , each by suitable interconnecting shaft.
- gas turbine engines to which the present disclosure may be applied may have alternative configurations.
- such engines may have an alternative number of interconnecting shafts (e.g. three) and/or an alternative number of compressors and/or turbines.
- the engine may comprise a gearbox provided in the drive train from a turbine to a compressor and/or fan.
- these pipes may extend radially across the engine between rotating parts to feed bearings in the engine core about which the rotating parts are mounted.
- the pipe may pass between stages 16 , 17 of the turbine 10 and into a bearing structure within which the shaft which drives the turbines is mounted.
- FIGS. 2 and 3 show an assembly in accordance with the invention.
- the assembly is configured to allow access to the inner pipe 22 of the double walled pipe
- the assembly is configured completely to enclose the inner pipe 22 .
- the double walled pipe comprises an inner pipe 22 and an outer pipe 23 defining an annular space 24 therebetween.
- the inner wall 22 is joined to a body 26 by a weld 25 and is arranged to deliver a first fluid into the body 26 .
- the body might be a bearing a hub of a bearing structure and the first fluid may be a lubricant for the bearing components.
- the outer pipe 23 terminates short of the welded joint 25 leaving a space 27 sufficient to allow access to the welded joint 25 and the annular space 24 .
- a sleeve 28 sits around the outer pipe 23 and has an inner thread which engages with a complementary thread 29 arranged on an outer circumferential surface of the outer pipe 23 . It will appreciated that the sleeve 28 can be moved axial with respect to a common central axis of the inner pipe 22 and outer pipe 23 by turning the sleeve 28 about this axis with the complementary threads engaged. As can be seen from FIG. 3 , the complementary threads are arranged such that, when fully threaded, the sleeve closes the access space 27 , meets the body 28 and encloses the welded joint 25 .
- a locking nut 30 also sits around the outer pipe 23 and also has an inner thread which engages with a complementary thread 29 arranged on an outer circumferential surface of the outer pipe 23 .
- a tab washer 31 sits around the outer pipe 23 between the sleeve 28 and locking nut 30 . As can be seen in FIG. 3 , the tab washer 31 can engage in a circumferential groove 32 which sits in a mid-portion of the thread 29 .
- the outer pipe 23 is provided with a flange 33 against which the sleeve 28 can abut.
- One or both of the threaded adjustable sleeve 28 and threaded locking nut 30 may be provided with flats for a spanner on their outside.
- the adjustable sleeve 28 may be wound along the thread 29 until a desired gap 27 is achieved between the sleeve 28 and the body 26 .
- This gap 27 may be controlled by a slip gauge for example. By reversing the direction of winding along the threads 29 , the gap 27 can be closed (see FIG. 3 ). To lock the sleeve 28 in this position the locking nut 30 is wound tight to the sleeve, restricting its ability to reverse wind.
- the sleeve 28 and lock nut 30 may be torqued up against each other, for example by using a spanner and the flats.
- the tab washer 31 can be used to lock the positions of the sleeve 28 and not 30 . After torqueing the sleeve 28 and locking nut 30 , tabs of the tab washer 31 may be bent up and down to restrict axial and/or rotational movement of the sleeve 28 and nut 30 .
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Exhaust Silencers (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
Description
- The invention relates to a double skinned pipe assembly and more particularly to accessibility to joins between an end of such an assembly and a surface of a body fed or scavenged by the pipe.
- Double skinned pipe assemblies are known. Commonly, they comprise of an inner pipe containing a first fluid and an outer pipe containing a second fluid in an annular space encircling the inner pipe. The second fluid is typically air and the annular space serves to contain any fluid leaking from a crack in a wall of the inner pipe. Such pipes typically form part of a long supply line. They are often segmented and connected by suitably designed couplings and can thus be disassembled and reassembled without issue.
- In gas turbine engines, there is a need to feed fluids such as oil to various moving components within the engine. This presents a need for feed pipes from the fluid source across the engine. Such pipes will typically be joined to a surface of the body to be fed or scavenged in a manner which prevents leakage of oil outside of the body. For example, such pipes may be welded to the body. Conventionally, these feed pipes have been composed of a single walled pipe. With the advancement of engine technology, the temperature of air passing through the engine is ever increasing. In the event of a leakage of the pipe, there is increased risk of ignition of flammable fluids which has the potential to result in an engine fire. Consequently, great care must be taken in the selection, manufacture and installation of the material of a single walled pipe to minimise the risk of engine fire.
- Whilst the use of a second skin is known to contain leaks, this presents difficulties in installation inside an engine. The use of segmented pipes and multiple couplings as is known for current double skinned pipe applications is undesirable. A challenge arises in installing a double skinned feed pipe in such an application.
- In accordance with the present invention there is provided a double skinned pipe assembly comprising;
- an inner pipe and an outer pipe enclosing the inner pipe and defining an annular space between the inner pipe and the outer pipe;
a sleeve configured to slip over the outer pipe;
complementary threads on an outer wall of the outer pipe and an inner wall of the sleeve; and
a lock for locking the sleeve in position over the outer pipe when the complementary threads of the outer pipe and sleeve are engaged, wherein the configuration of the assembly is such that, in use, the sleeve is slidable between a first position where the inner pipe may be accessed and a second position wherein the inner pipe is completely enclosed. - For example, the pipe may be an oil feed pipe or an oil scavenge pipe.
- The lock may comprise a locking nut which includes a thread which is complementary to the thread on the outer pipe and is arranged to be threaded onto the outer pipe after the sleeve has been threaded onto the outer pipe. The lock may further include a tab washer arranged between a locking nut and the sleeve and receivable in a tab washer groove provided in a mid-portion of the thread, wherein once the sleeve and locking nut are arranged for locking, the tabs of the washer can be bent and engage with the nut and or sleeve to restrict axial and/or rotational movement thereof. In these embodiments, the sleeve locks up against the lock nut, such that the pipe itself is not torque loaded.
- In an alternative, the lock may comprise a clamp engageable around the outer pipe and optionally also the sleeve.
- The lock may be incorporated into the sleeve and/or the outer pipe. For example, the sleeve might incorporate a ratchet. In another example, the outer pipe may include an anti-rotation feature engaged by the sleeve when fully engaged to close the access space.
- The outer pipe may include a flange against which the sleeve may abut when the sleeve is in the second position. As an alternative to a flange, the outer pipe may comprise a plurality of substantially equally spaced radially outward protrusions against which the sleeve may abut when the sleeve is in the second position. Other stop devices will no doubt occur to the skilled addressee without departing from the scope of the invention as claimed.
- The inner pipe may be welded at a junction with a body into which the inner pipe feeds. Depending on the application of and environment in which the pipe assembly is to be used, alternative joining methods may be used. For example, the body may be the hub of a bearing structure in a gas turbine engine. The sleeve may pass through an orifice in a structure and a seal ring may be provided around the outer pipe.
- As will be appreciated, when the assembly is installed to feed into a body, the sleeve can be slid up and down to allow access to the joint between the inner pipe and the body. Because it is adjustable it can also easily take tolerances into account and hence provides protection of the maximum extent possible.
- Embodiments of the invention provide protection over the maximum length of the inner pipe without over constraining the assembly. The inner pipe can be joined to the body using conventional joining processes.
- Where the inner pipe is joined to a body using a fusion process (for example welding or brazing), the adjustable sleeve allows access to inspect the join and to check for leakage from the join or inner pipe. Because the sleeve is adjustable, manufacturing tolerances can be corrected ensuring that the inner pipe can be enclosed over its entire length.
- An embodiment of the invention may be further described with reference to the accompanying Figures in which;
-
FIG. 1 shows a section through a gas turbine engine as is known from the prior art and into which a double skinned pipe assembly of the invention might be incorporated; -
FIG. 2 shows an embodiment of a double skinned pipe assembly in accordance with the invention where the inner pipe is accessible; -
FIG. 3 shows the embodiment ofFIG. 2 where the inner pipe is fully enclosed. - With reference to
FIG. 1 , a gas turbine engine is generally indicated at 10, having a principal androtational axis 11. Theengine 10 comprises, in axial flow series, anair intake 12, apropulsive fan 13, a high-pressure compressor 14,combustion equipment 15, a high-pressure turbine 16, a low-pressure turbine 17 and anexhaust nozzle 18. Anacelle 20 generally surrounds theengine 10 and defines theintake 12. - The
gas turbine engine 10 works in the conventional manner so that air entering theintake 12 is accelerated by thefan 13 to produce two air flows: a first air flow into the high-pressure compressor 14 and a second air flow which passes through abypass duct 21 to provide propulsive thrust. The high-pressure compressor 14 compresses the air flow directed into it before delivering that air to thecombustion equipment 15. - In the
combustion equipment 15 the air flow is mixed with fuel and the mixture combusted. The resultant hot combustion products then expand through, and thereby drive the high and low-pressure turbines nozzle 18 to provide additional propulsive thrust. The high 16 and low 17 pressure turbines drive respectively thehigh pressure compressor 14 and thefan 13, each by suitable interconnecting shaft. - Other gas turbine engines to which the present disclosure may be applied may have alternative configurations. By way of example such engines may have an alternative number of interconnecting shafts (e.g. three) and/or an alternative number of compressors and/or turbines. Further the engine may comprise a gearbox provided in the drive train from a turbine to a compressor and/or fan.
- It will be understood that with many moving parts within the engine, it is necessary to maintain a reservoir of oil and provide a network of supply pipes to components in need of lubrication. For example, these pipes may extend radially across the engine between rotating parts to feed bearings in the engine core about which the rotating parts are mounted. For example, the pipe may pass between
stages turbine 10 and into a bearing structure within which the shaft which drives the turbines is mounted. -
FIGS. 2 and 3 show an assembly in accordance with the invention. InFIG. 2 , the assembly is configured to allow access to theinner pipe 22 of the double walled pipe, inFIG. 3 the assembly is configured completely to enclose theinner pipe 22. As can be seen, the double walled pipe comprises aninner pipe 22 and anouter pipe 23 defining anannular space 24 therebetween. Theinner wall 22 is joined to abody 26 by aweld 25 and is arranged to deliver a first fluid into thebody 26. For example, the body might be a bearing a hub of a bearing structure and the first fluid may be a lubricant for the bearing components. - The
outer pipe 23 terminates short of the welded joint 25 leaving aspace 27 sufficient to allow access to the welded joint 25 and theannular space 24. - A
sleeve 28 sits around theouter pipe 23 and has an inner thread which engages with acomplementary thread 29 arranged on an outer circumferential surface of theouter pipe 23. It will appreciated that thesleeve 28 can be moved axial with respect to a common central axis of theinner pipe 22 andouter pipe 23 by turning thesleeve 28 about this axis with the complementary threads engaged. As can be seen fromFIG. 3 , the complementary threads are arranged such that, when fully threaded, the sleeve closes theaccess space 27, meets thebody 28 and encloses the welded joint 25. - A locking
nut 30 also sits around theouter pipe 23 and also has an inner thread which engages with acomplementary thread 29 arranged on an outer circumferential surface of theouter pipe 23. Finally atab washer 31 sits around theouter pipe 23 between thesleeve 28 and lockingnut 30. As can be seen inFIG. 3 , thetab washer 31 can engage in acircumferential groove 32 which sits in a mid-portion of thethread 29. Theouter pipe 23 is provided with aflange 33 against which thesleeve 28 can abut. - One or both of the threaded
adjustable sleeve 28 and threaded lockingnut 30 may be provided with flats for a spanner on their outside. After theinner pipe 22 is fixed to thebody 26 theadjustable sleeve 28 may be wound along thethread 29 until a desiredgap 27 is achieved between thesleeve 28 and thebody 26. Thisgap 27 may be controlled by a slip gauge for example. By reversing the direction of winding along thethreads 29, thegap 27 can be closed (seeFIG. 3 ). To lock thesleeve 28 in this position the lockingnut 30 is wound tight to the sleeve, restricting its ability to reverse wind. Thesleeve 28 andlock nut 30 may be torqued up against each other, for example by using a spanner and the flats. Thetab washer 31 can be used to lock the positions of thesleeve 28 and not 30. After torqueing thesleeve 28 and lockingnut 30, tabs of thetab washer 31 may be bent up and down to restrict axial and/or rotational movement of thesleeve 28 andnut 30. - Alternative locking arrangements for locking the
sleeve 28 in the “gap-closed” position will no doubt occur to the skilled addressee, the described locking arrangement configuration is not considered essential to the invention. - It will be understood that the invention is not limited to the embodiments above-described and various modifications and improvements can be made without departing from the concepts described herein. Except where mutually exclusive, any of the features may be employed separately or in combination with any other features and the disclosure extends to and includes all combinations and sub-combinations of one or more features described herein.
Claims (14)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GB1603870.5A GB2548332B (en) | 2016-03-07 | 2016-03-07 | Double skinned pipe assembly |
GB1603870.5 | 2016-03-07 | ||
GB1603870.05 | 2016-03-07 |
Publications (3)
Publication Number | Publication Date |
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US20170254445A1 US20170254445A1 (en) | 2017-09-07 |
US20190242500A9 true US20190242500A9 (en) | 2019-08-08 |
US10400920B2 US10400920B2 (en) | 2019-09-03 |
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US15/430,763 Active 2037-08-28 US10400920B2 (en) | 2016-03-07 | 2017-02-13 | Double skinned pipe assembly |
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GB (1) | GB2548332B (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS63243585A (en) * | 1986-11-18 | 1988-10-11 | 株式会社 リガルジヨイント | Joint for multiple pipe |
US5458375A (en) * | 1994-04-25 | 1995-10-17 | The Anspach Effort, Inc. | Rotary connector for fluid conduits |
US5498036A (en) * | 1994-09-09 | 1996-03-12 | Furon Company | Dual containment fitting |
US7427084B1 (en) * | 2006-06-09 | 2008-09-23 | Betz James C | Hose-in-hose coupler with longitudinally shiftable sleeve |
NO328496B1 (en) * | 2007-07-06 | 2010-03-01 | Inge Knotten | Device by hose |
US20090284004A1 (en) * | 2008-05-15 | 2009-11-19 | Simmons Tom M | Double containment system, fittings for fluid flow components and associated methods |
-
2016
- 2016-03-07 GB GB1603870.5A patent/GB2548332B/en active Active
-
2017
- 2017-02-13 US US15/430,763 patent/US10400920B2/en active Active
Also Published As
Publication number | Publication date |
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US20170254445A1 (en) | 2017-09-07 |
GB201603870D0 (en) | 2016-04-20 |
GB2548332A (en) | 2017-09-20 |
US10400920B2 (en) | 2019-09-03 |
GB2548332B (en) | 2020-11-04 |
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