CN112240226B

CN112240226B - Rotor assembly, aircraft engine and assembly method of rotor assembly

Info

Publication number: CN112240226B
Application number: CN201910650732.8A
Authority: CN
Inventors: 胡一廷; 郑思凯; 汤福龙
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-07-18
Filing date: 2019-07-18
Publication date: 2022-07-12
Anticipated expiration: 2039-07-18
Also published as: CN112240226A

Abstract

The present disclosure relates to a rotor assembly rotatable about a rotor axis, comprising: the connecting bolt can penetrate through the first mounting hole of the first rotor and the second mounting hole of the second rotor and is fastened by a nut, and a first boss is arranged at the nut of the connecting bolt; the second boss is arranged on the inner wall of the first drum and can be axially lapped and loaded on the outer side of the nut of the connecting bolt when the connecting bolt penetrates through the first mounting hole; and a set distance exists between the second boss and one end, far away from the second rotor, of the first mounting hole along the central axis direction of the first mounting hole, so that the connecting bolt has a space capable of freely stretching relative to the first mounting hole. Based on this, this disclosed embodiment can reduce the demand to the space in the rotor subassembly assembling process, makes the assembling process of rotor subassembly more accurate, convenient, reduces connection structure simultaneously and to the influence of rotor dynamic unbalance nature.

Description

Rotor assembly, aircraft engine and assembly method of rotor assembly

Technical Field

The present disclosure relates to the field of gas turbines, and more particularly, to a rotor assembly and a method of assembling the same.

Background

For axial induction aircraft engines, compressors and turbines often convert energy by high speed rotation of rotors arranged in multiple stages. In order to improve the power of the current aircraft engine, the number of stages of a compressor or a turbine is generally increased so as to improve the air pressure entering a combustion chamber or improve the efficiency of converting the thermal energy of the turbine into the mechanical energy. In order to increase the thrust-weight ratio of an aircraft engine, designers desire that the aircraft engine be as light as possible, so that the aircraft engine is more compact.

Under the influence of increasing number of rotor stages and increasingly compact structures, how to place more stages of turbine disks or compressor disks in a limited space is a great challenge for designers to face in structural design.

Taking a disc-drum mixed axial flow compressor rotor as an example, a drum barrel can be integrated with a wheel disc, so that the torque of the rotor can be transmitted step by the wheel disc or a rotor shaft, the drum barrel and the wheel disc, and the disc-drum mixed rotor also has the advantages of good bending resistance, good rigidity, good disc rotor strength and the like of the drum rotor, so that the disc-drum mixed rotor becomes the most commonly used rotor structure at present. In the drum and wheel disc integrated disc-drum mixed rotor structure, short bolts are mostly adopted to connect the rotors so as to reduce the number of large parts (such as long bolts), greatly simplify the structure and enable the design position of the drum to be more flexible.

However, in the case that the connection between the disks becomes more and more compact, how to realize the effective connection of the short bolts in a narrow space is one of the difficulties in the structural design of the engine. In addition, the existing connection process between the wheel discs is often not convenient enough, so that the assembly precision is not enough, and meanwhile, the connection fittings which are irregularly assembled or irregularly designed also easily have adverse effects on the balance of the rotor.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide a rotor assembly, an aircraft engine, and an assembling method of the rotor assembly, which can reduce the requirement for space in the assembling process of the rotor assembly, make the assembling process of the rotor assembly more accurate and convenient, and reduce the influence of the connection structure on the balance of the rotor.

In one aspect of the present disclosure, there is provided a rotor assembly, rotatable about a rotor shaft, comprising:

the first rotor comprises a first wheel disc and a first drum barrel which are integrated, a first mounting ring extending along the radial direction is arranged on the first drum barrel, and a first mounting hole is formed in the first mounting ring;

the second rotor comprises a second wheel disc and a second drum barrel which are integrated, a second mounting ring extending along the radial direction is arranged on the second drum barrel, and a second mounting hole is formed in the second mounting ring;

the connecting bolt can penetrate through the first mounting hole and the second mounting hole and is fastened by a nut, and a first boss is arranged at the nut of the connecting bolt; and

the second boss is arranged on the inner wall of the first drum and can axially overlap and bear the first boss on the outer side of the nut of the connecting bolt when the connecting bolt penetrates through the first mounting hole;

and a set distance exists between the second boss and one end of the first mounting hole, which is far away from the second rotor, along the central axis direction of the first mounting hole, so that the connecting bolt has a free telescopic space relative to the first mounting hole.

In some embodiments, the set pitch is configured to:

when the connecting bolt penetrates through the first mounting hole and the second mounting hole and the first boss is in lap joint with the second boss, the distance between the connecting bolt and the second wheel disc is larger than the thickness of the nut.

In some embodiments, one side of the first boss has an arcuate surface that can conform to an inner wall of the first drum to limit rotation of the coupling bolt.

In some embodiments, the distance between the first mounting ring and the first wheel disc is not greater than the length of the connecting bolt, and the first mounting hole and the screw rod of the connecting bolt have a set gap therebetween, so that the connecting bolt can obliquely penetrate into the first mounting hole relative to the central axis of the first mounting hole.

In some embodiments, the rotor assembly further comprises:

and the bushing is arranged between the first mounting hole and the screw rod of the connecting bolt, is in interference fit with the first mounting hole, and is in clearance fit with the screw rod of the connecting bolt.

In some embodiments, the rotor assembly further comprises:

the sealing ring can seal interstage airflows of the first wheel disc and the second wheel disc, is provided with a third mounting ring along the radial direction, and is provided with a third mounting hole;

wherein the aperture of the third mounting hole is not smaller than the aperture of the first mounting hole, and the sum of the thicknesses of the third mounting ring and the first mounting ring is larger than the height of the bushing.

In some embodiments, the rotor assembly further comprises:

the shaft neck is fixedly arranged or fixedly connected with the rotor shaft and provided with a fourth mounting ring along the radial direction, and a fourth mounting hole is formed in the fourth mounting ring;

wherein the connecting bolt is further connected with the fourth mounting hole, so that the first wheel disc and the second wheel disc are fixedly connected with the rotor shaft through a shaft neck.

In another aspect of the present disclosure, there is provided an aircraft engine comprising a rotor assembly as described in any of the previous embodiments.

In yet another aspect of the present disclosure, there is provided an assembling method of a rotor assembly, including the steps of:

obliquely penetrating a connecting bolt into a first mounting hole on the first rotor;

turning a round angle at the nut of the connecting bolt to be attached to the inner wall of the first drum;

righting the connecting bolt, and enabling a first boss at the nut of the connecting bolt to be in lap joint with a second boss on the inner wall of the first drum;

sleeving a bushing from a screw rod of the connecting bolt, and pressing the bushing into the first mounting hole;

sleeving a second mounting hole in the second rotor into the screw of the connecting bolt; and

and under the condition of keeping the first boss to be lapped and borne on the second boss, installing a nut at the end part of the screw rod, and screwing the nut until the nut of the connecting bolt abuts against the first installation hole.

In some embodiments, before the second mounting hole of the second rotor is sleeved into the screw of the connecting bolt, the assembling method further comprises:

sleeving a third mounting hole in the sealing ring into the screw rod of the connecting bolt, and sleeving the third mounting hole on the outer wall surface of the bushing; and/or

And sleeving a fourth mounting hole on the journal into the screw rod of the connecting bolt.

Therefore, according to the embodiment of the disclosure, the requirement on space in the assembling process of the rotor assembly can be at least reduced, the assembling process of the rotor assembly is more accurate and convenient, and meanwhile, the influence of the connecting structure on the balance of the rotor is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a rotor assembly according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a second rotor in a state of being mounted on a connecting bolt according to some embodiments of the present disclosure;

FIG. 3 is a schematic structural view of a connection bolt installed at an inclination with respect to a first mounting hole according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of a connection bolt with a first boss in an overlapping relationship with a second boss according to some embodiments of the present disclosure;

FIG. 5 is a schematic structural view of a bushing according to some embodiments of the present disclosure in a state of being sleeved on a connecting bolt;

FIG. 6 is a schematic view of an angle of a connecting bolt according to some embodiments of the present disclosure;

FIG. 7 is a structural schematic view of another angle of a connecting bolt according to some embodiments of the present disclosure;

FIG. 8 is a schematic structural view of a coupling bolt engaged with a first drum according to some embodiments of the present disclosure;

in the figure:

1. the device comprises a first rotor, 11, a first wheel disc, 12, a first drum barrel, 121, a second boss, 13, a first mounting ring, 131 and a first mounting hole;

2. a second rotor 21, a second wheel disc 22, a second drum barrel 23, a second mounting ring 231 and a second mounting hole;

3. the connecting bolt 31, the first boss 311 and the cambered surface;

4. a nut;

5. a bushing;

6. a seal ring 61, a third mounting ring 611, a third mounting hole;

7. journal, 71, fourth mounting ring, 711, fourth mounting hole.

It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar words in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

1-8, in one aspect of the present disclosure, there is provided a rotor assembly rotatable about a rotor shaft, comprising:

the first rotor 1 comprises a first wheel disc 11 and a first drum barrel 12 which are integrated, wherein a first mounting ring 13 extending along the radial direction is arranged on the first drum barrel 12, and a first mounting hole 131 is formed in the first mounting ring 13;

the second rotor 2 comprises an integrated second wheel disc 21 and a second drum barrel 22, a second mounting ring 23 extending along the radial direction is arranged on the second drum barrel 22, and a second mounting hole 231 is formed in the second mounting ring 23;

a connecting bolt 3 which can pass through the first mounting hole 131 and the second mounting hole 231 and is fastened by a nut 4, and a nut of the connecting bolt 3 is provided with a first boss 31; and

a second boss 121, disposed on the inner wall of the first drum 12, for axially bearing the first boss 31 in an overlapping manner on the outer side of the nut of the connecting bolt 3 when the connecting bolt 3 passes through the first mounting hole 131;

along the central axis direction of the first mounting hole 131, a set distance exists between the second boss 121 and one end of the first mounting hole 131 far away from the second rotor 2, so that the connecting bolt 3 has a space capable of freely extending and retracting relative to the first mounting hole 131.

As shown in fig. 1, the axial direction, the radial direction and the circumferential direction of the present disclosure are all referred to a rotor shaft, and will not be described in detail later. The first rotor 1 and the second rotor 2 both adopt an integrated wheel disc and drum barrel structure, so that the wheel disc and the drum barrel are not detachable, and the first mounting ring 13 and the second mounting ring 23 are respectively positioned at the ends of the first drum barrel 12 and the second drum barrel 22, so that the movable range of the rotor assembly connecting structure is further limited between the first wheel disc 11 and the first mounting ring 13, and between the second wheel disc 21 and the second mounting ring 23.

In the conventional installation process, the connecting bolt 3 is often abutted against the end of the first installation hole 131, so that the following rotation of the connecting bolt 3 in the process of screwing the nut 4 is limited by virtue of friction force. At this point, the distance between the connecting bolt 3 and the second wheel 21 will not be sufficient to place the nut 4 at the end of the bolt. Even if the nut 4 is placed at the installation position by making the connecting bolt 3 not abut against the end of the first installation hole 131 any more, the connecting bolt 3 follows up during the process of screwing the nut 4 because of not contacting with the end of the first installation hole 131, and the connecting bolt 3 is liable to fall off during the process of placing the nut 4 at the installation position, further increasing the difficulty of the assembly work

This is disclosed through the nut department of connecting bolt 3 sets up first boss 31, and with first mounting hole 131 is kept away from there is the setting for interval department to set up in the one end of second rotor 2 second boss 121, through first boss 31 with the overlap joint bearing effect between the second boss 121 not only prevents connecting bolt 3 frequently falls in the installation, can also pass through first boss 31 with contact between the second boss 121 produces certain frictional force, prevents connecting bolt 3 is in the in-process follow-up that nut 4 precession is changeed.

Furthermore, as shown in fig. 2, the set distance is such that the connecting bolt 3 is freely retractable relative to the first mounting hole 131, thereby providing sufficient space for placing the nut 4, i.e. in some embodiments, the set distance is configured to:

when the connecting bolt 3 passes through the first mounting hole 131 and the second mounting hole 231 and the first boss 31 is overlapped and carried on the second boss 121, the distance between the connecting bolt 3 and the second wheel disc 21 is made larger than the thickness of the nut 4.

Further, as shown in fig. 6 to 8, in some embodiments, one side of the first boss 31 has an arc surface 311, and the arc surface 311 can fit the inner wall of the first drum 12 to limit the rotation of the connecting bolt 3.

The cambered surface 311 and the inner wall of the first drum 12 may be in a fitting relationship or a small clearance fit relationship, and only the following rotation of the connecting bolt 3 needs to be limited. When the radial clearance between the cambered surface 311 and the inner wall of the first drum 12 is reduced, the range of the rotation angle of the connecting bolt 3 is reduced, so that the connecting bolt 3 is always in a relatively stable position, and the influence of the irregular parts on the unbalance of the rotor due to uneven mass distribution is reduced. In addition, the contact of the cambered surface 311 can reduce the extrusion strength of the connecting bolt 3 on the inner wall of the first drum 12, and avoid damaging the inner wall of the first drum 12 in the process of screwing the nut 4.

Further, as shown in fig. 3 to 5, in some embodiments, the distance between the first mounting ring 13 and the first wheel disc 11 is not greater than the length of the connecting bolt 3, and a gap is set between the first mounting hole 131 and the screw of the connecting bolt 3, so that the connecting bolt 3 can obliquely penetrate into the first mounting hole 131 relative to the central axis of the first mounting hole 131.

Limited by the distance between the first mounting ring 13 and the first wheel disc 11, the connecting bolt 3 is difficult to penetrate into the first mounting hole 131 in a manner that the axis of the connecting bolt coincides with the central axis of the first mounting hole 131, and on the basis of this, the connecting bolt 3 can extend into the first mounting hole 131 in an inclined posture by arranging the first mounting hole 131 larger than the screw size of the connecting bolt 3.

Further, since a set gap is formed between the first mounting hole 131 and the screw of the connecting bolt 3, the connecting bolt 3 lacks sufficient position limitation, and is prone to faults such as looseness and falling off during the operation of the aircraft engine. Based on this, in some embodiments, the rotor assembly further comprises:

and the bushing 5 is arranged between the first mounting hole 131 and the screw rod of the connecting bolt 3, is in interference fit with the first mounting hole 131, and is in clearance fit with the screw rod of the connecting bolt 3.

The fit clearance between the screw of the connecting bolt 3 and the inner hole of the bushing 5 can be selected to be 0.02-0.05 mm, so that the first wheel disc 11 and the second wheel disc 21 can be precisely positioned.

The connecting bolt may be used only for connecting the first rotor and the second rotor, or may be used for connecting the first rotor, the second rotor, the seal structure, and the rotor shaft. When the structure of the rotor assembly is increased, the length of the connecting bolt is increased along with the structure of the rotor assembly, so that the assembly difficulty of the rotor assembly is further improved.

Based on this, further, in some embodiments, the rotor assembly further comprises:

the sealing ring 6 can seal interstage airflows of the first wheel disc 11 and the second wheel disc 21, is provided with a third mounting ring 61 along the radial direction, and a third mounting hole 611 is formed in the third mounting ring 61;

wherein the aperture of the third mounting hole 611 is not smaller than the aperture of the first mounting hole 131, and the sum of the thicknesses of the third mounting ring 61 and the first mounting ring 13 is larger than the height of the bushing 5.

Further, in some embodiments, the rotor assembly further comprises:

the journal 7 is fixedly arranged or fixedly connected to the rotor shaft, and is provided with a fourth mounting ring 71 along the radial direction, and a fourth mounting hole 711 is formed in the fourth mounting ring 71;

wherein the connecting bolt 3 is further connected to the fourth mounting hole 711, so that the first disk 11 and the second disk 21 are fixedly connected to the rotor shaft through a journal 7.

the connecting bolt 3 is obliquely inserted into the first mounting hole 131 of the first rotor 1;

turning the round angle at the nut of the connecting bolt 3 to be attached to the inner wall of the first drum 12;

righting the connecting bolt 3, and enabling a first boss 31 at the nut of the connecting bolt 3 to be lapped and carried on a second boss 121 on the inner wall of the first drum 12;

sleeving a bushing 5 from a screw rod of the connecting bolt 3 and pressing the bushing into the first mounting hole 131;

sleeving a second mounting hole 231 on the second rotor 2 into a screw rod of the connecting bolt 3; and

in a state where the first boss 31 is held in lap joint with the second boss 121, a nut 4 is mounted on an end portion of the screw rod, and the nut 4 is screwed in until a nut of the connecting bolt 3 abuts against the first mounting hole 131.

In some embodiments, before the second mounting hole 231 of the second rotor 2 is sleeved into the screw of the connecting bolt 3, the assembling method further includes:

sleeving a third mounting hole 611 on the sealing ring 6 into the screw of the connecting bolt 3, and sleeving part of the third mounting hole 611 on the outer wall surface of the bushing 5; and/or

The fourth mounting hole 711 on the journal 7 is sleeved on the screw of the connecting bolt 3.

Therefore, according to the embodiment of the disclosure, the requirement on space in the assembling process of the rotor assembly can be at least reduced, so that the structural design of the rotor assembly becomes more compact, the assembling process of the rotor assembly can be more accurate and convenient, the influence of the connecting structure on the dynamic unbalance of the rotor is reduced, the connecting structure of the rotor assembly is simple, and the realization cost is low.

Thus, various embodiments of the present disclosure have been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A rotor assembly rotatable about a rotor axis, comprising:

the second boss is arranged on the inner wall of the first drum and can be axially lapped and loaded on the outer side of the connecting bolt and the nut when the connecting bolt penetrates through the first mounting hole;

and a set distance exists between the second boss and one end, far away from the second rotor, of the first mounting hole along the central axis direction of the first mounting hole, so that the connecting bolt has a space capable of freely stretching relative to the first mounting hole.

2. The rotor assembly of claim 1, wherein the set pitch is configured to:

3. The rotor assembly of claim 2 wherein one side of the first boss has an arcuate surface that can engage an inner wall of the first drum to limit rotation of the attachment bolt.

4. The rotor assembly of claim 1 wherein the spacing between the first mounting ring and the first wheel disc is no greater than the length of the connecting bolt, and the first mounting hole has a set clearance from the shank of the connecting bolt to enable the connecting bolt to pass through the first mounting hole at an angle relative to the central axis of the first mounting hole.

5. The rotor assembly of claim 4, further comprising:

6. The rotor assembly of claim 5, further comprising:

the diameter of the third mounting hole is not smaller than that of the first mounting hole, and the sum of the thicknesses of the third mounting ring and the first mounting ring is larger than the height of the bushing.

7. The rotor assembly of claim 1, further comprising:

8. An aircraft engine comprising a rotor assembly as claimed in any one of claims 1 to 7.

9. A method of assembling a rotor assembly, comprising the steps of:

and under the condition that the first boss is held on the second boss in a lap joint mode, a nut is installed at the end part of the screw rod, and the nut is screwed in until a nut of the connecting bolt abuts against the first installation hole.

10. The assembly method of claim 9, wherein before nesting the second mounting hole of the second rotor into the screw of the connecting bolt, the assembly method further comprises: