CN112045615A

CN112045615A - Assembly tool for inner guide pipe of turbine shaft

Info

Publication number: CN112045615A
Application number: CN201910491035.2A
Authority: CN
Inventors: 李志平; 胡一廷; 孙磊
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-12-08
Anticipated expiration: 2039-06-06
Also published as: CN112045615B

Abstract

The invention aims to provide an assembly tool for a guide pipe in a turbine shaft, which can improve the accuracy of the assembly of the guide pipe in the turbine shaft. In order to realize the purpose, the assembly tool for the inner guide pipe of the turbine shaft comprises an inner cone, an elastic expansion ring, a supporting seat, a screw and a nut. The inner cone body is provided with a conical surface, the elastic expansion ring can deform under the extrusion of the inner cone body and can be attached to the conical inner wall of the vent pipe, and the supporting seat is installed on a rear flange of the five-fulcrum sealing runway. One end of the screw rod penetrates through the elastic expansion ring and is connected with the inner cone, and the other end of the screw rod penetrates through the supporting seat and is connected with the nut. In a butt joint state, the nut is screwed to apply axial tension on the screw rod, the tension is transmitted to the inner cone and presses the elastic expansion ring on the conical inner wall of the vent pipe, so that the elastic expansion ring is attached to the conical inner wall, the supporting seat and the elastic expansion ring are configured into a pair of clamping structures, and the five-fulcrum sealing runway and the vent pipe are connected into a whole.

Description

Assembly tool for inner guide pipe of turbine shaft

Technical Field

The invention relates to an assembly tool for a guide pipe in a turbine shaft.

Background

A breather pipe is arranged in a low-pressure turbine shaft of the aircraft engine and used for exhausting waste gas in a high-pressure cavity. Fig. 1 is a schematic cross-sectional view of a low-pressure turbine shaft, a contact position of a front end 11 of a vent pipe 1 and the low-pressure turbine shaft 2 is sealed by a rubber ring 3 to prevent air leakage, and when the vent pipe 1 and the low-pressure turbine shaft 2 are assembled, a large external force is needed to overcome a friction force between the rubber ring 3 of the front end 11 of the vent pipe 1 and an inner wall of the low-pressure turbine shaft 2 to assemble the vent pipe 1 in place. The rear end 12 of the breather pipe 1 is provided with a connecting flange 13, a five-fulcrum sealing runway 4 is arranged on the connecting flange 13, and the outer wall of the five-fulcrum sealing runway 4 is in small clearance fit with the inner wall 20 of the low-pressure turbine shaft 2 supporting conical wall, so that the rear end 12 of the breather pipe 1 is supported in the inner wall 20 of the low-pressure turbine shaft 2 supporting conical wall. The rubber ring 3 is also arranged on the outer periphery of the five-fulcrum sealing track 4 to prevent air leakage.

Fig. 2 is a schematic perspective view showing an unassembled state of the vent pipe and the five-fulcrum sealing runway, in order to prevent the vent pipe 1 and the five-fulcrum sealing runway 4 from rotating in the low-pressure turbine shaft 2, an anti-rotation groove 10 is provided on an end surface of a connecting flange 13 of the vent pipe 1, and an anti-rotation tooth 41 is provided on the five-fulcrum sealing runway 4 at a position corresponding to each anti-rotation groove 10; meanwhile, the anti-rotation teeth 14 are provided on the outer peripheral side of the connecting flange 13, and the anti-rotation grooves 21 are correspondingly provided on the inner peripheral side wall of the low-pressure turbine shaft 2, and during the assembly process, the

anti-rotation teeth

14, 41 are assembled in such a manner as to be aligned with the

anti-rotation grooves

21, 10, so as to prevent the aforementioned rotation.

However, in the above assembling process, since the breather pipe 1 and the five-fulcrum seal runway 4 are installed in the low-pressure turbine shaft 2, the

anti-rotation teeth

14 and 41 and the

anti-rotation grooves

21 and 10 are not visible in the assembling process, and the phenomena of tooth space position misalignment, no assembling position, and deformation or damage of the anti-rotation teeth are easily generated.

Disclosure of Invention

The invention aims to provide an assembly tool for a guide pipe in a turbine shaft, which can improve the accuracy of the assembly of the guide pipe in the turbine shaft.

In order to realize the purpose, the assembly tool for the inner guide pipe of the turbine shaft comprises an inner cone, an elastic expansion ring, a supporting seat, a screw and a nut. The inner cone has a conical surface. The elastic expansion ring is a conical thin sheet, can deform under the extrusion of the inner cone and is arranged to be attached to the conical inner wall of the vent pipe, and the supporting seat can be arranged on a rear flange of the five-fulcrum sealing runway. One end of the screw rod penetrates through the elastic expansion ring and is connected with the inner cone, the other end of the screw rod penetrates through the supporting seat, and the nut is connected with the other end of the screw rod. The nut screws the screw rod on the supporting seat in a butt joint state of the five-fulcrum sealing runway and the vent pipe, so that axial tension is applied to the screw rod and transmitted to the inner cone, the inner cone is located in the elastic expansion ring and presses the elastic expansion ring on the conical inner wall of the vent pipe, the elastic expansion ring is attached to the conical inner wall, and the supporting seat and the elastic expansion ring are configured into a pair of clamping structures to connect the five-fulcrum sealing runway and the vent pipe into a whole.

In one or more embodiments, the tool further comprises a fixed seat and a mandril, wherein the fixed seat is provided with a connecting part which can be in threaded connection with the rear end of the low-pressure shaft, and the mandril is in threaded connection with a threaded hole provided by the fixed seat;

after an assembly body formed by integrally connecting the five-fulcrum sealing runway and the vent pipe is placed into the low-pressure shaft, the fixed seat is installed at the rear end of the low-pressure shaft, and the ejector rod penetrates through the fixed seat and applies thrust to the supporting seat so as to push the assembly body.

In one or more embodiments, the tool includes a top ring fixed to the support base and covering the other end of the screw, the top ring has an end bearing portion, and the ejector rod applies the thrust to the end bearing portion.

In one or more embodiments, the supporting seat is provided with a groove, the groove is used for the top ring to be embedded in and position the top ring, and the screw rod penetrates out of the groove.

In one or more embodiments, the support seat is provided with an anti-rotation tooth indicating device, which is used for aligning with an anti-rotation groove in the low-pressure shaft and an anti-rotation tooth on the vent pipe respectively.

In one or more embodiments, the support seat has a spigot portion through which a flange-side spigot of a five-fulcrum sealing race may be connected.

In one or more embodiments, the support seat is cylindrical, a support plane through which the screw rod passes is provided at one end of the support seat, a spigot portion connected to a flange edge of the five-fulcrum sealing runway is provided at the other end of the support seat, and the screw rod is screwed on the support plane by the nut.

In one or more embodiments, the circumferential wall of the support seat is provided with a plurality of windows.

In one or more embodiments, the fixing base is cylindrical, and a fixing plane through which the push rod passes is provided at one end of the fixing base, and a screw thread portion that is screwed to the rear end of the low-pressure shaft is provided at the other end of the fixing base.

In one or more embodiments, the circumferential wall of the holder is provided with a plurality of windows.

The gain effect of the invention is that: the assembly body is formed by clamping the five-fulcrum sealing runway and the breather pipe under the supporting seat and the elastic expansion ring, and then the assembly body is pushed into the low-pressure shaft to complete assembly, so that the assembly process of the five-fulcrum sealing runway and the breather pipe is visible, the tooth socket position is aligned more easily, and the assembly accuracy is improved.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view of a low-pressure turbine shaft;

FIG. 2 is a perspective view of the vent pipe and five-pivot sealing runway in an unassembled state;

FIG. 3 illustrates a schematic cross-sectional view of one embodiment of a turbine shaft inner duct assembly fixture;

FIG. 4 shows a perspective view of another embodiment of an assembly fixture;

FIG. 5 shows a cross-sectional schematic view of another embodiment of an assembly fixture;

fig. 6 shows a schematic cross-sectional view of the assembly tool in an assembled state.

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present disclosure. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

It should be noted that, where used, the following description of upper, lower, left, right, front, rear, top, bottom, positive, negative, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed orientation. In fact, they are used to reflect the relative position and/or orientation between the various parts of the object.

Fig. 3 is a schematic cross-sectional view of an embodiment of a turbine shaft inner conduit assembly tool, and fig. 3 can be seen as a cross-sectional view taken along a direction a-a in fig. 2 after the assembly tool is assembled with the breather pipe 1 and the five-fulcrum sealing runway 4 in fig. 1 or fig. 2. The assembly tool is provided with an inner cone 5, an elastic expansion ring 6, a supporting seat 8, a screw rod 71 and a nut 72. Wherein the inner cone 5 has a conical surface 50. The elastic expansion ring 6 is a tapered thin plate which can be deformed by being pressed by the inner cone 5. The vent pipe 1 has a tapered inner wall 15, and the elastic expansion ring 6 is configured to be attached to the tapered inner wall 15 of the vent pipe 1 when being pressed and deformed by the inner cone 5. The support base 8 may be mounted on the rear flange 44 of the five-pivot sealing runner 4. One end 710 of the screw 71 passes through the elastic expansion ring 6 and is connected with the inner cone 5, the other end 712 passes through the supporting seat 8, and the nut 72 is connected with the other end 712 of the screw 71. Wherein, the screw rod 71 and the inner cone 5 can be connected by a fixed connection or a fastening piece.

In the abutting state of the five-fulcrum seal running 4 and the breather pipe 1 as shown in fig. 3, the nut 72 is screwed in the downward direction in the figure and screws the screw rod 71 to the support seat 8, and thereby a pulling force in the upward direction in the figure in the axial direction a of the breather pipe 1 is exerted on the screw rod 71, and the pulling force in the axial direction a is transmitted to the inner cone 5 via the screw rod 71 to pull the inner cone 5 in the upward direction in the figure in the axial direction a. The upward direction in the drawing is a direction from one end 710 to the other end 712 of the screw 71 in the drawing. The inner cone 5 is located in the elastic expansion ring 6 and presses the elastic expansion ring 6 against the conical inner wall 15 of the vent pipe 1 in a direction along the axial direction a of the vent pipe 1 and upward in the figure, so that the elastic expansion ring 6 is attached to the conical inner wall 15. Specifically, the inner cone 5 may be configured to be separable from the elastic expander 6 in an unassembled state, to be brought into compression within the elastic expander 6 during assembly, and to be able to expand the elastic expander 6, and in one embodiment, the inner cone 5 may be a jaw that contracts in the unassembled state and expands during assembly to expand the elastic expander 6. The above arrangement makes the supporting seat 8 and the elastic expansion ring 6 form a pair of clamping structures to connect the five-fulcrum sealing runway 4 and the vent pipe 1 into an assembly 100.

Fig. 4 shows a schematic perspective view, fig. 5 shows a schematic cross-sectional view and fig. 6 shows a schematic cross-sectional view of another embodiment of the assembly tool in an assembled state. Fig. 5 can be taken as a schematic sectional view along the direction B-B in fig. 4 in the assembled state of the tool in fig. 4; fig. 6 can be taken as a schematic cross-sectional view of the tool shown in fig. 5 after assembly with the vent pipe 1 and the five-fulcrum sealing runway 4 shown in fig. 1. Referring to fig. 4 to 6, the assembly fixture further includes a fixing seat 9 and a push rod 91. The outer periphery of the rear end 22 of the low-pressure shaft 2 is provided with an external thread, correspondingly, the fixed seat 9 is provided with a connecting part 92 which can be in threaded connection with the rear end 22 of the low-pressure shaft 2, the connecting part 92 can be an internal thread arranged on the inner periphery of the fixed seat 9, and the fixed seat 9 is connected with the rear end 22 of the low-pressure shaft 2 through threaded fit. A threaded hole 93 is further provided on the fixed seat 9, and the ejector rod 91 is arranged on the fixed seat 9 in a threaded connection mode with the threaded hole 93. In the embodiment shown in fig. 4, one end 710 of the screw 71 is a protrusion, the inner cone 5 is movable on the screw 71, and when the nut 72 is tightened, the protrusion of the one end 710 of the screw 71 pulls the inner cone 5 in the axial direction a and upward direction in the figure to expand and press the elastic expansion ring 6 against the tapered inner wall 15 of the vent pipe 1. In one embodiment, the elastic expansion ring 6 has wrinkles 60 on the outer circumferential tapered surface as shown in fig. 4, and the wrinkles 60 can be spread by the inner cone 5 so that the diameter of the elastic expansion ring 6 is increased and attached to the tapered inner wall 15. In some embodiments, the elastic expansion ring 6 is made of an elastically expandable material, such as rubber.

After the five-fulcrum sealing runway 4 and the vent pipe 1 are assembled as shown in fig. 3 and integrally connected to form the assembly body 100, the assembly body 100 is put into the low-pressure shaft 2 from the rear end 22, at this time, the fixing seat 9 is installed at the rear end 22 of the low-pressure shaft 2, the ejector rod 91 penetrates through the fixing seat 9 and applies a pushing force in a downward direction in the drawing to the supporting seat 8, so that the assembly body 100 is pushed to push the assembly body 100 into the low-pressure shaft 2.

The assembly body 100 is formed by clamping the five-fulcrum sealing runway 4 and the vent pipe 1 under the supporting seat 8 and the elastic expansion ring 6, and then the assembly body 100 is pushed into the low-pressure shaft 2 through the ejector rod 91 to complete assembly, so that the assembly process of the five-fulcrum sealing runway 4 and the vent pipe 1 is visible, the assembly body 100 is assembled after the anti-rotation teeth 41 and the anti-rotation grooves 10 are aligned, the tooth socket positions are aligned more easily, and the assembly accuracy is improved.

With continued reference to fig. 4-6, in one embodiment of the assembly fixture, the fixture further includes a top ring 94, and the top ring 94 is fixed on the support base 8 and covers the other end 712 of the screw 71. The top ring 94 has a bearing portion 940, and the top bar 91 exerts a thrust force on the bearing portion 940 in the downward direction in the drawing. By providing the top ring 94, the force applied by the top rods 91 to the assembly 100 can be made more uniform. In one embodiment, the force bearing portion 940 may be a hole disposed on the upper end surface of the top ring 94 as shown in fig. 4, wherein the hole size ratio in fig. 4 is only schematically drawn, and the size relationship between the threaded hole 93 and the force bearing portion 940 may be different as shown in the figure.

Referring to fig. 4, in one embodiment of the assembly fixture, the supporting seat 8 is provided with a groove 80, and the groove 80 may be disposed on the upper surface of the supporting seat 8 as shown in the figure and recessed downward from the upper surface of the supporting seat 8, so that the groove 80 can be embedded by the top ring 94 and play a role in positioning the top ring 94. The screw rod 71 penetrates out of the supporting seat 8 from the groove 80.

In one embodiment of the assembly fixture, the support seat 8 is provided with an anti-rotation tooth indicating device 81, which is used for aligning with the anti-rotation groove 21 in the low pressure shaft 2 and the anti-rotation tooth 14 on the vent pipe 1 respectively during assembly, so that after the five-fulcrum sealing runway 4 and the vent pipe 1 form the assembly body 100 under the clamping of the support seat 8 and the elastic expansion ring 6, an assembler can align the anti-rotation tooth 14 on the vent pipe with the anti-rotation groove 21 in the low pressure shaft 2 through the position of the indicating device 81, and the assembly accuracy is further improved.

Referring to fig. 3, in one embodiment of the assembly fixture, the rear flange 44 of the five-fulcrum sealing runway 4 has a flange edge seam allowance 42, and correspondingly, the support seat 8 has a seam allowance 82 capable of being connected with the flange edge seam allowance 42, and the support seat 8 is connected with the five-fulcrum sealing runway 4 by connecting the seam allowance 82 with the flange edge seam allowance 42.

Referring to fig. 3 to 4, in an embodiment of the assembly fixture, the supporting seat 8 is a cylinder as shown in fig. 3, a supporting plane 83 is provided at one end of the cylinder, a spigot portion 82 connected to the spigot 42 of the flange edge of the five-fulcrum sealing runway 4 is provided at the other end of the cylinder, a hole 830 is formed in the supporting plane 83 for the screw 71 to pass through, and the nut 72 is used for screwing the screw 71 on the supporting plane 83.

In one embodiment of the assembly fixture, the circumferential wall 84 of the support base 8 is provided with a plurality of windows 85, and the weight of the fixture can be reduced while the whole assembly process is visualized by providing the windows 85.

Referring to fig. 4 to 5, in an embodiment of the assembly fixture, the fixing base 9 is cylindrical, a fixing plane 95 is disposed at one end of the fixing base 9, and a threaded portion that is a connecting portion 92 where the fixing base 9 is connected to the rear end 22 of the low-pressure shaft 2 is disposed at the other end of the fixing base 9. Wherein, the fixing plane 95 is provided with a threaded hole 93 for the post rod 91 to pass through.

In one embodiment of the assembly fixture, the circumferential wall 96 of the fixing seat 9 is provided with a plurality of windows 97, so that the whole assembly process is visualized through the windows 97, and the weight of the fixture can be reduced.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. The utility model provides a pipe assembly fixture in turbine shaft which characterized in that includes:

an inner cone having a conical surface;

the elastic expansion ring is a conical sheet, can deform under the extrusion of the inner cone and is arranged to be attached to the conical inner wall of the vent pipe;

the supporting seat can be arranged on a rear flange of the five-fulcrum sealing runway;

one end of the screw rod penetrates through the elastic expansion ring and is connected with the inner cone, and the other end of the screw rod penetrates through the supporting seat; and

a nut connected to the other end of the screw;

the nut screws the screw rod on the supporting seat in a butt joint state of the five-fulcrum sealing runway and the vent pipe, so that axial tension is applied to the screw rod and transmitted to the inner cone, the inner cone is located in the elastic expansion ring and presses the elastic expansion ring on the conical inner wall of the vent pipe, the elastic expansion ring is attached to the conical inner wall, and the supporting seat and the elastic expansion ring are configured into a pair of clamping structures to connect the five-fulcrum sealing runway and the vent pipe into a whole.

2. The assembly fixture for the inner conduit of the turbine shaft of claim 1, further comprising a fixed seat and a mandril, wherein the fixed seat is provided with a connecting part which can be in threaded connection with the rear end of the low-pressure shaft, and the mandril is in threaded connection with a threaded hole provided by the fixed seat;

3. The turbine shaft innerduct assembly fixture of claim 2, including a top ring secured to said support block and housing said other end of said screw, said top ring having an end bearing portion, said carrier rod exerting said pushing force on said end bearing portion.

4. The assembly tooling for the inner conduit of the turbine shaft of claim 3, wherein the support seat is provided with a groove for the top ring to be inserted into and position the top ring, and the screw rod penetrates out of the groove.

5. The assembly tooling for the inner conduit of the turbine shaft of claim 1, wherein the support seat is provided with an anti-rotation tooth indicating device for aligning with an anti-rotation groove in the low pressure shaft and an anti-rotation tooth on the vent pipe respectively.

6. The assembly tooling for the inner conduit of a turbine shaft of claim 1, wherein the support base has a spigot portion through which it can be connected to a flange spigot of a five-point seal runner.

7. The assembly fixture for a conduit in a turbine shaft of claim 1, wherein the support base is cylindrical, a support plane through which the screw rod passes is provided at one end of the support base, a spigot portion connected to a flange of a five-fulcrum seal raceway is provided at the other end of the support base, and the nut tightens the screw rod on the support plane.

8. The assembly tooling for the inner conduit of a turbine shaft of claim 7, wherein the circumferential wall of the support seat is provided with a plurality of windows.

9. The assembly fixture for a conduit in a turbine shaft of claim 2, wherein the fixing seat is cylindrical, a fixing plane for the ejector rod to pass through is arranged at one end of the fixing seat, and a threaded portion in threaded connection with the rear end of the low-pressure shaft is arranged at the other end of the fixing seat.

10. The assembly tooling for the inner conduit of the turbine shaft of claim 9, wherein the circumferential wall of the fixed seat is provided with a plurality of windows.