CN217502067U - Shaft connecting mechanism and assembling mechanism suitable for gas compressor - Google Patents

Abstract

There is provided a shaft connecting mechanism for a compressor, comprising: a compressor rear journal; the compressor shaft is sleeved at one end in the rear shaft neck of the compressor and penetrates along the axial direction to form an assembly channel which is suitable for guiding the assembly mechanism to stretch into; the turbine shaft is sleeved at the other end in the rear shaft neck of the gas compressor and is connected with the rear shaft neck of the gas compressor; and the shaft coupling sets up between compressor shaft and turbine shaft, and the shaft coupling includes: the first end of the spline outer shaft is connected with the turbine shaft, and a groove-shaped part is arranged in the second end of the spline outer shaft, which is back to the first end; the spline inner shaft is arranged in the groove-shaped part in a telescopic mode, is configured to move between a first position where the spline inner shaft is retracted into the groove-shaped part and a second position where a part of the spline inner shaft extends out of the groove-shaped part, and is connected with the spline outer shaft in a shaft mode; and the elastic pressing piece is arranged between the spline inner shaft and the spline outer shaft and is suitable for applying pressure far away from the spline outer shaft to the spline inner shaft. An assembly mechanism is also provided.

Description

Shaft connecting mechanism and assembling mechanism suitable for gas compressor

Technical Field

The utility model relates to an aeroengine's rotor connection technical field, more specifically relates to shaft connecting mechanism and assembly devices suitable for compressor.

Background

A compressor rotor and a turbine rotor of the aero-engine need to be connected through a coupler so as to achieve torque transmission.

At present, in a common rigid coupling, a pin and a key are matched to realize shaft connection of a compressor shaft and a turbine shaft in a torque transmission mode. In the assembling process, the installation positions of the compressor shaft, the turbine shaft and the coupling need to be connected and fixed through bolts and/or flanges and other parts, the structure is complex, and the dismounting process is complex.

SUMMERY OF THE UTILITY MODEL

To prior art problem, the utility model provides a shaft connecting mechanism and assembly devices suitable for compressor for technical problem more than at least part of solution.

In order to achieve the above object, as the utility model provides an axle connecting mechanism suitable for compressor, include: a compressor rear journal; the compressor shaft is sleeved at one end in the rear shaft neck of the compressor, and the compressor shaft penetrates along the axial direction to form an assembly channel which is suitable for guiding an assembly mechanism to stretch into the assembly channel; the turbine shaft is sleeved at the other end in the rear shaft neck of the gas compressor and is connected with the rear shaft neck of the gas compressor; and a coupling disposed between the compressor shaft and the turbine shaft, the coupling including: the first end of the spline outer shaft is connected with the turbine shaft, and a groove-shaped part is arranged in the second end, back to the first end, of the spline outer shaft; an inner spline shaft telescopically disposed in the groove portion, configured to move between a first position retracted into the groove portion and a second position partially extended from the groove portion, and connected with the outer spline shaft; the elastic pressing piece is arranged between the inner spline shaft and the outer spline shaft and is suitable for applying pressure to the inner spline shaft away from the outer spline shaft so as to restore the inner spline shaft from the first position to the second position; the spline inner shaft is in a first position, a part of the groove-shaped part close to the compressor shaft is exposed out of the spline inner shaft and is suitable for being matched with the assembling mechanism to enable the coupler and the turbine shaft to be close to reach an assembling position, and the spline inner shaft is in a second position and is connected with the compressor shaft to enable torque output by the turbine shaft to be transmitted to the compressor shaft.

In an exemplary embodiment, a depth of the groove portion in an axial direction of the turbine shaft is larger than a length of the spline inner shaft.

In an exemplary embodiment, the coupling further comprises: the threaded retainer ring is sleeved inside the spline inner shaft, two ends of the threaded retainer ring respectively penetrate out of the same side end part of the spline inner shaft and the groove-shaped part, a first flange is arranged at the end part of the threaded retainer ring, which penetrates out of the spline inner shaft, in a protruding mode along the circumferential direction, and the spline inner shaft is abutted against the first flange; and the first nut is in threaded fit with the end part of the threaded retainer ring, which penetrates out of the groove-shaped part, so as to limit the relative positions of the inner spline shaft and the outer spline shaft.

In an exemplary embodiment, the elastic pressing member is sleeved outside the threaded retainer ring, and two ends of the elastic pressing member respectively abut against end faces on the same side of the inner spline shaft and the outer spline shaft.

In an exemplary embodiment, an outer portion of the spline outer shaft protrudes outward in a circumferential direction to form a second flange adapted to cooperate with the compressor rear journal to limit an axial position of the spline outer shaft relative to the compressor rear journal.

In an exemplary embodiment, the outer surface of the first end of the splined outer shaft is provided with first splines and the inner surface of the turbine shaft is provided with second splines that mesh with the first splines to connect the splined outer shaft with the turbine shaft.

In an exemplary embodiment, the inner surface of the groove portion is provided with third splines, and the outer surface of the inner splined shaft is provided with fourth splines engaged with the third splines to connect the inner splined shaft and the outer splined shaft.

In an exemplary embodiment, an end portion of the compressor shaft on the same side as the inner splined shaft is provided with a fifth spline engaged with the fourth spline to connect the inner splined shaft and the compressor shaft with the inner splined shaft in the second position.

In an exemplary embodiment, an inner surface of a portion of the compressor rear journal opposite to the turbine shaft is provided with a sixth spline, and an outer surface of the turbine shaft is provided with a seventh spline engaged with the sixth spline to engage and connect the turbine shaft and the compressor rear journal.

The utility model also provides an assembly devices, include: the rod-shaped part is suitable for penetrating into the assembly channel, and an eighth spline suitable for being matched with the groove-shaped part is arranged on the outer side of the end part of the rod-shaped part, extending into the assembly channel; the rod-shaped piece is suitable for pushing the inner spline shaft to the first position and connecting with the outer spline shaft in a state that the rod-shaped piece extends into the assembling channel, so that the coupling and the turbine shaft are driven to approach until the assembling position is reached.

According to the utility model discloses a shaft connecting mechanism and assembly devices suitable for compressor, the axle is constructed to move between first position and second position for the outer axle of spline in the spline. Because the spline inner shaft, the spline outer shaft and the turbine shaft are always in a shaft connecting state, a part of the spline inner shaft extending from the groove-shaped part can be automatically connected with the compressor shaft in a state that the spline inner shaft is in the second position, so that the torque of the turbine shaft is transmitted to the compressor shaft. The assembling passage arranged in the compressor shaft is used for guiding the assembling mechanism to extend into the assembling passage, and the spline inner shaft can be pushed to the first position under the condition that the assembling mechanism abuts against one axial end of the spline inner shaft, so that the compressor shaft and the turbine shaft are separated. And in this position, the assembly mechanism and the outer spline shaft are engaged to drive the outer spline shaft and the turbine shaft closer together until the assembly position is reached. The compressor rear shaft neck, the compressor shaft, the turbine shaft and the coupling do not need to be fixed by bolts, the structure is simple, and the matching degree is high. In addition, in the assembling process, only the axial position and the circumferential position of the assembling mechanism need to be controlled, and the operation is simple and convenient.

Drawings

Fig. 1 is a cross-sectional view of a shaft connecting mechanism for a compressor according to an exemplary embodiment of the present invention;

FIG. 2 is an enlarged partial view of a coupling portion of the exemplary embodiment of a shaft coupling mechanism for a compressor shown in FIG. 1;

FIG. 3 is an enlarged fragmentary view of a splined bushing portion of the exemplary embodiment shown in FIG. 1 suitable for use in a shaft connecting mechanism of a compressor; and

fig. 4 is a schematic diagram of an assembly mechanism according to an exemplary embodiment of the present invention.

In the above figures, the reference numerals have the following meanings in detail:

1. a spline outer shaft;

2. an inner spline shaft;

3. a threaded retainer ring;

4. a first nut;

5. an elastic pressing piece;

6. a window;

7. a compressor shaft;

8. a turbine shaft;

9. a compressor rear journal;

10. a joint bowl;

11. a joint head;

12. a third nut;

13. the spline is connected with the bushing;

14. an inner shaft nut retainer ring;

15. a gasket;

16. a second nut;

17. a rear spline retainer ring;

18. a rear retainer ring;

19. a rod-shaped member;

31. a first spline;

32. a second spline;

33. a third spline;

34. a fourth spline;

35. a fifth spline;

36. a sixth spline;

37. a seventh spline; and

38. and an eighth spline.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components. All terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.

In this document, unless specifically stated otherwise, directional terms such as "upper", "lower", "left", "right", "inner", "outer", and the like are used to indicate orientations or positional relationships based on the orientation shown in the drawings, merely for convenience in describing the present invention, and do not indicate or imply that the referenced device, element, or component must have a particular orientation, be constructed or operated in a particular orientation. It should be understood that when the absolute positions of the objects to be described are changed, the relative positional relationships they represent may also change accordingly. Accordingly, these directional terms should not be construed as limiting the present invention.

In the case where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems having A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, C, etc.) in the case where a convention analogous to "at least one of A, B or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems having A alone, B alone, C alone, A and B together, A and C together, Systems with B and C, and/or with A, B, C, etc.).

Fig. 1 is a cross-sectional view of a shaft connecting mechanism for a compressor according to an exemplary embodiment of the present invention. Fig. 2 is a partially enlarged view of a coupling portion of a shaft connecting mechanism for a compressor of the exemplary embodiment shown in fig. 1. FIG. 3 is an enlarged partial view of a splined bushing portion of the exemplary embodiment shown in FIG. 1 that is suitable for use in a shaft connecting mechanism of a compressor.

The illustrative embodiment of the utility model provides a shaft connecting mechanism suitable for compressor, as shown in fig. 1 to 3, shaft connecting mechanism suitable for compressor includes compressor back axle journal 9, compressor shaft 7, turbine shaft 8 and shaft coupling. The compressor shaft 7 is sleeved at one end (the lower end shown in fig. 1) in the compressor rear journal 9, and the compressor shaft 7 penetrates in the axial direction to form an assembly channel suitable for guiding an assembly mechanism to extend into. The turbine shaft 8 is sleeved at the other end (the upper end as shown in fig. 1) in the compressor rear journal 9 and is connected with the compressor rear journal 9 shaft. The coupling is arranged between the compressor shaft 7 and the turbine shaft 8. The shaft coupling comprises a spline outer shaft 1, a spline inner shaft 2 and an elastic pressing piece 5. A first end (upper end as shown in fig. 1) of the spline outer shaft 1 is connected to the turbine shaft 8, and a groove portion is provided in a second end (lower end as shown in fig. 1) of the spline outer shaft 1 facing away from the first end. The spline inner shaft 2 is telescopically arranged in the groove-shaped part, is configured to move between a first position retracted into the groove-shaped part and a second position partially extending out of the groove-shaped part, and is connected with the spline outer shaft 1 through a shaft. The elastic pressing piece 5 is arranged between the inner spline shaft 2 and the outer spline shaft 1 and is suitable for applying a pressure to the inner spline shaft 2 away from the outer spline shaft 1 so as to restore the inner spline shaft 2 from the first position to the second position. In the state that the splined inner shaft 2 is in the first position, the part of the groove-shaped part close to the compressor shaft 7 is exposed outside the splined inner shaft 2 and is suitable for being matched with an assembling mechanism so as to enable the shaft coupler and the turbine shaft 8 to be close to reach the assembling position, and in the state that the splined inner shaft 2 is in the second position, the splined inner shaft 2 is connected with the compressor shaft 7 through a shaft so as to transmit the torque output by the turbine shaft 8 to the compressor shaft 7.

In an exemplary embodiment, a plurality of windows 6 are provided at regular intervals on the splined outer shaft 1.

In detail, the window 6 is configured to include, but not limited to, a quadrangular structure. Such an embodiment facilitates the flow of the secondary air system.

According to the embodiment of the present disclosure, as shown in fig. 2, the depth of the groove portion in the axial direction of the turbine shaft 8 is larger than the length of the splined inner shaft 2.

In an exemplary embodiment, as shown in fig. 2, the depth of the groove portion in the axial direction of the turbine shaft 8 is characterized by the distance between the second end of the spline outer shaft 1 and the groove bottom of the groove portion (as indicated by d 1), and the length of the spline inner shaft 2 is characterized by the distance between the top surface and the bottom surface of the spline inner shaft 2 (as indicated by d 2).

According to an embodiment of the present disclosure, as shown in fig. 1, the coupling further includes a threaded retainer ring 3 and a first nut 4. The inside of 2, the both ends of 3 covers of screw retaining ring are located in the spline interior shaft and are worn out by the homonymy tip of 2 and flute profile portions in the spline respectively, and screw retaining ring 3 is provided with first flange along the outside protrusion of circumference by the tip that 2 worn out in the spline interior shaft, and 2 supports and leans on first flange in the spline interior shaft. The first nut 4 and the end part of the threaded retainer ring 3, which penetrates out of the groove-shaped part, are in threaded fit so as to limit the relative positions of the inner spline shaft 2 and the outer spline shaft 1.

In an exemplary embodiment, as shown in FIG. 1, the threaded retainer 3 is configured to include, but is not limited to, a tubular member.

In detail, the splined inner shaft 2 is configured to include a tubular structure that passes through in the axial direction, and the threaded retainer ring 3 is sleeved in the tubular structure.

Further, the inner diameter of the tubular structure is adapted to the outer diameter of the threaded collar 3 so that the threaded collar 3 fits inside the splined inner shaft 2.

In an exemplary embodiment, the end of the threaded retainer ring 3 that is pierced by the splined outer shaft 1 is provided with a plurality of grooves at even intervals in the circumferential direction.

In detail, in the state of being sleeved with the first nut 4, each groove is embedded with a locking plate. In this embodiment, the axial positions of the first nut 4 and the retainer ring 3 can be restricted to effectively prevent the retainer ring 3 from coming off.

According to the embodiment of the disclosure, as shown in fig. 2, the elastic pressing member 5 is sleeved outside the threaded retainer ring 3, and two ends of the elastic pressing member 5 respectively abut against end faces of the inner spline shaft 2 and the outer spline shaft 1 on the same side.

In an exemplary embodiment, the resilient press 5 includes, but is not limited to, a compression spring.

In detail, the bottom surface of the groove-shaped portion is configured in a stepped structure, and one end of the compression spring is embedded in the bottom of the stepped structure.

Further, the other end of the compression spring abuts against a portion of the spline inner shaft 2 opposite to the bottom surface of the groove. Such an embodiment is advantageous for limiting the radial position of the splined inner shaft 2 so that the splined inner shaft 2 is displaced as little as possible during the movement between the first and second positions.

According to the embodiment of the disclosure, as shown in fig. 1, the outer portion of the spline outer shaft 1 protrudes outward in the circumferential direction to form a second flange, which is suitable for being matched with the compressor rear journal 9 to limit the axial position of the spline outer shaft 1 relative to the compressor rear journal 9.

In an exemplary embodiment, as shown in FIG. 1, the shaft connecting mechanism further includes a washer 15, a second nut 16, a rear spline retainer 17, and a rear retainer 18.

In detail, the gasket 15 is sleeved inside the compressor rear journal 9 and is adapted to abut against a first face of the second flange. The second nut 16 is in threaded engagement with the compressor rear journal 9 and is adapted to abut against a second face of the second flange facing away from the first face.

Further, the rear spline retainer ring 17 is sleeved on the inner side of the compressor rear journal 9 and abuts against the end face, far away from the second flange, of the second nut 16. And the rear retainer ring 18 is sleeved on the inner side of the compressor rear shaft neck 9 and abutted against the end surface of the rear spline retainer ring 17 far away from the second nut 16, and is used for limiting the position of the second nut 16. In this way, the relative axial position of the spline outer shaft 1 and the compressor rear journal 9 can be limited. After the assembly is completed, the movement of the turbine shaft 8 and the compressor rear shaft neck 9 can be effectively prevented.

According to an embodiment of the present disclosure, as shown in fig. 1, the outer surface of the first end of the splined outer shaft 1 is provided with first splines 31, and the inner surface of the turbine shaft 8 is provided with second splines 32 engaged with the first splines 31 to connect the splined outer shaft 1 with the turbine shaft 8 shaft.

According to the embodiment of the present disclosure, as shown in fig. 2, the inner surface of the groove portion is provided with third splines 33, and the outer surface of the splined inner shaft 2 is provided with fourth splines 34 engaged with the third splines 33 to connect the splined inner shaft 2 and the splined outer shaft 1 with each other.

According to the embodiment of the present disclosure, as shown in fig. 1, the end portion of the compressor shaft 7 on the same side as the splined inner shaft 2 is provided with the fifth spline 35 engaged with the fourth spline 34 to connect the splined inner shaft 2 and the compressor shaft 7 with each other in a state where the splined inner shaft 2 is in the second position.

In an exemplary embodiment, as shown in fig. 1, the shaft connecting mechanism further includes a joint bowl 10, a joint head 11 and a third nut 12, which are sequentially sleeved outside the compressor shaft 7 from a side far from the turbine shaft 8 to a side near to the turbine shaft 8.

In detail, the third nut 12 is screw-fitted to the end of the compressor shaft 7 extending into the compressor rear journal 9. In this embodiment, the joint head 11 and the joint bowl 10 can be limited to the relative axial position between the compressor shaft 7 and the compressor rear journal 9. So that the structure of the shaft connecting mechanism is compact.

In an exemplary embodiment, as shown in FIG. 1, the shaft connection mechanism further includes a spline bushing and an inner spindle nut retainer 14.

In detail, the spline bushing is sleeved inside the third nut 12, and is provided with a fifth spline 35 engaged with a fourth spline 34 formed on the splined inner shaft 2.

Further, an inner spindle nut retainer ring 14 is disposed inside the third nut 12 and against the spline bushing, adapted to restrain the spline bushing in a relative position inside the third nut 12. In such an embodiment, the fifth spline 35 is formed on the spline housing, and the spline housing is detachably disposed on the compressor shaft 7, so that the manufacturing difficulty and the manufacturing cost of the fifth spline 35 can be effectively reduced.

According to the embodiment of the disclosure, as shown in fig. 1, the inner surface of a portion of the compressor rear journal 9 opposite to the turbine shaft 8 is provided with a sixth spline 36, and the outer surface of the turbine shaft 8 is provided with a seventh spline 37 engaged with the sixth spline 36 to engage and connect the turbine shaft 8 and the compressor rear journal 9.

In an exemplary embodiment, the first spline 31, the second spline 32, the third spline 33, the fourth spline 34, the fifth spline 35, the sixth spline 36, and the seventh spline 37 are configured as an involute wire spline structure. Between the spline of mutually supporting, the bulge gomphosis of a spline is to the depressed part of another spline, and connected mode is comparatively stable, and can comparatively effectual restriction compressor shaft 7, the degree of freedom of circumference between shaft coupling and the turbine shaft 8 to only there is the ascending degree of freedom of axial direction when making spline inner shaft 2 and compressor shaft 7 assemble, in order to realize the auto-lock, and can comparatively effectual position compressor shaft 7 and turbine shaft 8's axiality at the in-process of auto-lock, need not to carry out centering operation.

Fig. 4 is a schematic diagram of an assembly mechanism according to an exemplary embodiment of the present invention.

An illustrative embodiment of the present invention also provides an assembly mechanism, as shown in fig. 4, including a rod-shaped member 19 adapted to penetrate the assembly passage, the outside of the end of the rod-shaped member that extends into the assembly passage is provided with an eighth spline 38 adapted to mate with the groove-shaped member. In the state in which the rod-shaped element 19 projects into the assembly channel, it is suitable for pushing the splined inner shaft 2 into the first position and for connecting it to the splined outer shaft 1 in order to drive the coupling and the turbine shaft 8 closer until the assembly position is reached.

In an exemplary embodiment, the process of assembling the shaft connecting mechanism by the assembling mechanism, referring to fig. 1, includes:

s1: one end (the upper end shown in fig. 1) of the compressor shaft 7 is locked by a third nut 12, inserted into a spline connection bushing 13 and clamped and limited by an inner shaft nut retainer ring 14;

s2: sleeving a compressor shaft 7, a joint bowl 10 and a joint head 11 into a compressor rear shaft neck 9 together (from top to bottom as shown in figure 1);

s3: after the gasket 15 is sleeved into the compressor rear shaft neck 9, the coupler is installed into the compressor rear shaft neck 9 in a state that the fourth spline 34 is matched with the fifth spline 35;

s4: screwing a second nut 16 to enable the second nut 16 to be in threaded fit with the rear shaft neck 9 of the compressor, fixing the coupler, sequentially sleeving a rear spline retainer ring 17 and a rear retainer ring 18, and clamping and limiting the coupler;

s5: inserting the turbine shaft 8 from the compressor rear shaft neck 9 until the turbine shaft 8 contacts with the end part of the coupler on the same side, and enabling a second spline 32 of the turbine shaft 8 to be matched with a first spline 31 of the spline outer shaft 1;

s6: extending an end portion (a right end as viewed in fig. 4) of the fitting mechanism into the compressor shaft 7 along a fitting passage formed by the compressor shaft 7 and pushing the inner splined shaft 2 from the second position to the first position until the inner splined shaft 2 is fully embedded in the outer splined shaft 1 and the eighth spline 38 is engaged with at least a portion of the at least third spline 33;

s7: rotating around the axis of the rod-shaped piece 19 to enable the spline outer shaft 1 to rotate, meanwhile, conveying the turbine shaft 8 to the direction close to the compressor shaft 7, and enabling the spline outer shaft 1 to be in threaded fit with the turbine shaft 8 and limited by the turbine shaft 8 and the compressor rear journal 9, so that the turbine shaft 8 can approach the spline outer shaft 1 until the assembling position abutting against the rear retainer ring 18 is reached;

s8: and (4) drawing out the assembly mechanism, and resetting the spline inner shaft 2 to a second position under the action of a compression spring to complete the shaft connection of the compressor shaft 7 and the turbine shaft 8.

In another exemplary embodiment, the compressor shaft 7 may be disengaged from the turbine shaft 8 by performing steps S8 through S1. In the embodiment, in the assembling and disassembling process, only the assembling mechanism and the turbine shaft 8 need to be controlled, and a connecting mechanism such as a bolt is not needed, so that the operation is simple and convenient.

It will be understood by those skilled in the art that several combinations and/or combinations of the features recited in the various embodiments and/or claims of the present invention are possible, even if such combinations or combinations are not explicitly recited in the present invention. In particular, features described in various embodiments and/or in the claims of the present invention may be combined and/or coupled in several ways without departing from the spirit and teachings of the present invention. All such combinations and/or associations fall within the scope of the present invention.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A shaft coupling mechanism for a compressor, comprising:

a compressor rear journal (9);

the compressor shaft (7) is sleeved at one end in the compressor rear shaft neck (9), and the compressor shaft (7) penetrates along the axial direction to form an assembly channel and is suitable for guiding an assembly mechanism to stretch into the assembly channel;

the turbine shaft (8) is sleeved at the other end in the compressor rear shaft neck (9) and is connected with the compressor rear shaft neck (9) in a shaft mode; and

a coupling disposed between the compressor shaft (7) and the turbine shaft (8), the coupling comprising:

the spline outer shaft (1), a first end of the spline outer shaft (1) is connected with the turbine shaft (8) in a shaft mode, and a groove-shaped part is arranged in a second end, back to the first end, of the spline outer shaft (1);

an inner spline shaft (2) which is telescopically arranged in the groove-shaped part, is configured to move between a first position retracted into the groove-shaped part and a second position partially extended from the groove-shaped part, and is connected with the outer spline shaft (1) in a shaft mode; and

the elastic pressing piece (5) is arranged between the inner spline shaft (2) and the outer spline shaft (1) and is suitable for applying pressure to the inner spline shaft (2) away from the outer spline shaft (1) so as to restore the inner spline shaft (2) from the first position to the second position;

wherein, under the state that the spline inner shaft (2) is at the first position, the part of the groove part close to the compressor shaft (7) is exposed outside the spline inner shaft (2) and is suitable for being matched with the assembling mechanism so as to close the shaft coupling and the turbine shaft (8) to reach the assembling position, and under the state that the spline inner shaft (2) is at the second position, the spline inner shaft is connected with the compressor shaft (7) so as to transmit the torque output by the turbine shaft (8) to the compressor shaft (7).

2. The shaft connecting mechanism according to claim 1, characterized in that a depth of the groove-shaped portion in an axial direction of the turbine shaft (8) is larger than a length of the splined inner shaft (2).

3. The shaft coupling mechanism of claim 1, wherein the coupling further comprises:

the threaded retaining ring (3) is sleeved inside the spline inner shaft (2), two ends of the threaded retaining ring (3) respectively penetrate out of the spline inner shaft (2) and the end part of the groove-shaped part at the same side, a first flange is arranged at the end part, penetrating out of the spline inner shaft (2), of the threaded retaining ring (3) in a protruding mode along the circumferential direction, and the spline inner shaft (2) abuts against the first flange; and

and the first nut (4) is in threaded fit with the end part of the threaded retainer ring (3) which penetrates out of the groove-shaped part so as to limit the relative positions of the spline inner shaft (2) and the spline outer shaft (1).

4. The shaft connecting mechanism according to claim 3, wherein the elastic pressing piece (5) is sleeved outside the threaded retainer ring (3), and two ends of the elastic pressing piece (5) respectively abut against end faces on the same side of the inner spline shaft (2) and the outer spline shaft (1).

5. Shaft connection according to claim 1, characterized in that the outer part of the splined outer shaft (1) is outwardly circumferentially convex forming a second flange adapted to cooperate with the compressor rear journal (9) to limit the axial position of the splined outer shaft (1) relative to the compressor rear journal (9).

6. Shaft connecting mechanism according to one of claims 1 to 5, characterized in that the outer surface of the first end of the splined outer shaft (1) is provided with first splines (31) and the inner surface of the turbine shaft (8) is provided with second splines (32) which mesh with the first splines (31) for connecting the splined outer shaft (1) with the turbine shaft (8).

7. A shaft connecting mechanism according to any one of claims 1 to 5, characterized in that the inner surface of the groove portion is provided with third splines (33), and the outer surface of the inner splined shaft (2) is provided with fourth splines (34) which mesh with the third splines (33) to connect the inner splined shaft (2) and the outer splined shaft (1) by a shaft.

8. Shaft connection according to claim 7, characterized in that the end of the compressor shaft (7) on the same side as the splined inner shaft (2) is provided with a fifth spline (35) engaging with the fourth spline (34) to connect the splined inner shaft (2) and the compressor shaft (7) to each other in the state where the splined inner shaft (2) is in the second position.

9. The shaft connecting mechanism according to any one of claims 1 to 5, wherein an inner surface of a portion of the compressor rear journal (9) opposite to the turbine shaft (8) is provided with a sixth spline (36), and a seventh spline (37) meshing with the sixth spline (36) is provided on an outer surface of the turbine shaft (8) to mesh-connect the turbine shaft (8) and the compressor rear journal (9).

10. An assembling mechanism adapted to assemble the shaft connecting mechanism according to any one of claims 1 to 9, comprising:

a rod-shaped member (19) adapted to penetrate into the assembly channel, the outer side of the end of the rod-shaped member protruding into the assembly channel being provided with an eighth spline (38) adapted to cooperate with the groove;

wherein, under the state that the rod-shaped piece (19) extends into the assembling passage, the spline inner shaft (2) is pushed to the first position and is connected with the spline outer shaft (1) in a shaft mode so as to drive the shaft coupling and the turbine shaft (8) to approach to reach the assembling position.

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