Air duct and bleed air components

Abstract

An air duct is provided, comprising a duct body for draining gas from a compressor rotor and a connecting end for connecting to a high-vortex rotor rear shaft, and also comprising a sleeve and a retaining spring. The sleeve is sleeved on the outside of the connecting end, and has a sleeve first end for approaching the high-vortex rotor rear shaft, which surrounds a sleeve second end opposite to the sleeve first end, and also has a positioning pin guide groove and a positioning hole formed in the sleeve first end; the retaining spring connects the sleeve and the connecting end at the sleeve second end, and is used to prevent the sleeve from moving toward the high-vortex rotor rear shaft. The connecting end of the duct body has a key connection portion for connecting to a key connection mating portion; the positioning pin guide groove is spiral, and the positioning hole extends outward from the groove bottom of the positioning pin guide groove to achieve rapid positioning and self-locking of the air duct. A bleed assembly is also provided to achieve rapid self-locking connection between the air duct and the high-vortex rotor rear shaft.

Description

Technical Field

[0001] The invention relates to an air duct for a gas turbine engine and a bleed air assembly with the air duct. Background Art

[0002] The high-pressure rotor air duct of a gas turbine engine has two main functions: one is to guide the gas from the compressor rotor to the high-vortex rotor for cooling; the other is to guide the gas from the compressor rotor to the middle bearing cavity for sealing.

[0003] like Figure 1 As shown, the high-pressure rotor air duct 100 is usually connected to the high-vortex rotor rear shaft 2 by threaded connection. After the high-pressure rotor air duct 100 and the high-vortex rotor rear shaft 2 are tightened, a special tool is used to insert the anti-rotation clamp ring from the inside of the air duct 100 into the rear end tooth structure of the air duct and the front end tooth structure of the high-vortex rear shaft to ensure that the air duct 100 and the high-vortex rotor rear shaft 2 are in a self-locking state.

[0004] The anti-rotation snap ring is inserted from the inside of the air duct after the air duct and the high-vortex rotor rear shaft are tightened, which brings inconvenience to installation, disassembly and maintenance. In addition, after the engine is running at high speed, the threaded structure between the high-pressure rotor air duct 100 and the high-vortex rotor rear shaft 2 is easily damaged and high-temperature adhesion occurs, which affects the disassembly and reassembly of the air duct.

[0005] Moreover, the phase of the air duct 100 relative to the high-vortex rotor rear shaft 2 will change when the air duct 100 is tightened twice. That is, when the air duct 100 is tightened to the high-vortex rotor rear shaft 2 for the first time, if the air duct 100 needs to be removed for repair reasons and the air duct 100 is screwed to the high-vortex rotor rear shaft 2 again, the phase of the thread rotation during tightening will be different from the first installation. Generally, the high-pressure rotor dynamic balance does not have an air duct. Therefore, the imbalance caused by the air duct is difficult to eliminate, which affects the engine vibration performance and cannot guarantee the engine vibration performance and operation safety. Summary of the invention

[0006] The object of the present invention is to provide an air duct which can be conveniently and safely installed on the rear shaft of a high-vortex rotor to achieve rapid self-locking of the air duct and the rear shaft of the high-vortex rotor.

[0007] The air duct for achieving the above-mentioned purpose includes a duct body for draining gas from the compressor rotor and a connecting end for connecting to the rear shaft of the high-vortex rotor, and also includes a sleeve and a retaining spring. The sleeve is sleeved on the outside of the connecting end, and has a sleeve first end for approaching the rear shaft of the high-vortex rotor, which surrounds the sleeve second end opposite to the sleeve first end, and also has a positioning pin guide groove and a positioning hole formed in the sleeve first end; the retaining spring connects the sleeve and the connecting end at the sleeve second end, and is used to prevent the sleeve from moving toward the rear shaft of the high-vortex rotor. The connecting end of the duct body has a key connection portion for connecting to the key connection mating portion; the positioning pin guide groove is spiral, and the positioning hole extends outward from the bottom of the positioning pin guide groove.

[0008] In one or more embodiments, the air duct further comprises a centering component, which comprises a plurality of centering holes distributed circumferentially at the connection end; and an elastic component arranged in each of the centering holes, the elastic component protruding outward from the centering hole and contacting the inner wall surface of the sleeve to be in a compressed state.

[0009] In one or more embodiments, the elastic component includes a spring and a ball pressed outwardly by the spring.

[0010] In one or more embodiments, the outer circumferential surface of the second end of the sleeve is provided with a rotation anti-slip surface.

[0011] In one or more embodiments, the inner circumferential surface of the second end of the sleeve provides an inner shoulder, the outer circumferential surface of the catheter body provides an outer shoulder, and the retaining spring is clamped between the inner shoulder and the outer shoulder.

[0012] Another object of the present invention is to provide an air bleed assembly that is easy to assemble. The air bleed assembly includes an air duct and a high-vortex rotor rear shaft, the air duct is the above-mentioned air duct, and the high-vortex rotor rear shaft has a positioning pin protruding in the peripheral direction and a key connection matching portion. The duct body is keyed to the key connection matching portion through the key connection portion to achieve phase fixation relative to the high-vortex rotor rear shaft; the first end of the sleeve is sleeved on the outer periphery of the high-vortex rotor rear shaft, and the positioning pin guide groove provides a guide path for guiding the positioning pin to reach the positioning hole.

[0013] The above-mentioned air duct is added with a shaft sleeve and provides a self-locking structure. By providing a spiral locating pin guide groove and a locating hole on the locating pin guide groove, the locating pin on the rear shaft of the high-vortex rotor can be effectively guided to be fixed to the shaft sleeve of the air duct. At the same time, the key connection part on the shaft sleeve cooperates with the key connection matching part on the rear shaft of the high-vortex rotor to realize the positioning, compression and self-locking of the rear shaft of the high-vortex rotor and the air duct. It can be installed in place once and the phases of multiple installations can be kept consistent, eliminating the imbalance caused by the air duct and ensuring the vibration performance and safe operation of the engine. It also avoids the appearance of a threaded structure that affects the disassembly and reinstallation of the air duct, thereby optimizing the installation of the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0015] Figure 1 It is a schematic diagram of the traditional connection method of the air duct to the rear shaft of the high-vortex rotor.

[0016] Figure 2 It is a cross-sectional view of the connection between the air duct with the bushing and the rear shaft of the high-vortex rotor.

[0017] Figure 3 is a schematic diagram of an embodiment of a sleeve.

[0018] Figure 4 is a side view of one embodiment of a sleeve.

[0019] Figure 5 is a cross-sectional view of one embodiment of a sleeve when installed in an air duct.

[0020] Figure 6 It is a schematic diagram of an embodiment of a high-vortex rotor rear shaft.

[0021] Figure 7 It is a cross-sectional view of the air duct and the rear shaft of the high-vortex rotor in an installed state.

[0022] Figure 8 It is a cross-sectional view showing the air duct and the rear shaft of the high-vortex rotor in another installation state.

[0023] Fig. 9 This is a cross-sectional view of the air duct and the high-vortex rotor rear shaft after installation.

[0024] Description of Reference Numerals

[0025] 1 Catheter body

[0026] 2 High vortex rotor rear shaft

[0027] 10 Connection terminal

[0028] 11 Bushing

[0029] 13 Key connection

[0030] 14 Circlip

[0031] 16 Rotating anti-slip surface

[0032] 17 Locating pin guide groove

[0033] 18 Positioning holes

[0034] 19 Elastic components

[0035] 23 Boss

[0036] 24 Locating pin

[0037] 26-key connection mating part

[0038] 47 Inner shoulder

[0039] 49 External shoulder

[0040] 51 Centering hole

[0041] 100 Air duct

[0042] 115 Bushing first end

[0043] 116 Sleeve second end

[0044] 191 Spring

[0045] 192 spheroids DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with specific embodiments and drawings. More details are described in the following description to facilitate a full understanding of the present invention, but the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment. It should be noted that these and other subsequent drawings are only examples, which are not drawn according to the conditions of equal proportions, and should not be used as a limitation on the protection scope of the actual requirements of the present invention.

[0047] In order to realize the quick connection between the air duct 100 and the rear shaft 2 of the high-vortex rotor, a structure of the air duct is shown in FIG. Figures 2 to 5 The air duct comprises a duct body 1, a sleeve 11 and a retaining spring 14. The duct body 1 is used to guide gas from the compressor rotor, and the duct body 1 has a connecting end 10 for connecting to the rear shaft 2 of the high-vortex rotor.

[0048] Reference Figure 2 As shown, the sleeve 11 is sleeved on the outside of the connecting end 10, and has a sleeve first end 115 for being close to the high-vortex rotor rear shaft 2 and a sleeve second end 116 opposite to the sleeve first end 115, that is, the sleeve first end 115 and the sleeve second end 116 are distributed at both ends of the sleeve 11. The sleeve 11 also has a positioning pin guide groove 17 and a positioning hole 18 formed in the sleeve first end 115.

[0049] The specific positions of the positioning pin guide groove 17 and the positioning hole 18 can be referred to Figure 3 and Figure 4As shown. A positioning pin guide groove 17 is provided on the inner wall of the first end 115 of the sleeve 11 near the rear shaft 2 of the high-vortex rotor, and a positioning hole 18 is located on the positioning pin guide groove 17 and penetrates the wall surface of the sleeve 11. The positioning pin guide groove 17 is spiral, and the positioning hole 18 extends outward from the bottom of the positioning pin guide groove 17. The inner wall surface of the sleeve 11 is preferably provided with a plurality of positioning pin guide grooves 17, and a plurality of positioning holes 18 are correspondingly provided.

[0050] The retaining spring 14 is disposed at the second end 116 of the sleeve to connect the sleeve 11 and the connecting end 10. The retaining spring 14 is used to prevent the sleeve 11 from moving toward the rear shaft 2 of the high-vortex rotor. Figure 5 As shown, the inner circumference of the second end 116 of the sleeve provides an inner shoulder 47, the outer circumference of the catheter body 1 provides an outer shoulder 49, and the retaining spring 14 is clamped between the inner shoulder 47 and the outer shoulder 49. After the catheter body 1 is inserted into the sleeve 11, the sleeve 11 and the catheter body 1 are fixed by the retaining spring 14 and made into one.

[0051] The retaining spring 14 is preferably a standard part, and the staff can select a retaining spring of appropriate size according to the actual installation situation to ensure the connection between the sleeve 11 and the catheter body 1.

[0052] Back to Figure 4 As shown, the connection end 10 of the duct body 1 also has a key connection portion 13, and the key connection portion 13 is used to connect with the key connection matching portion 26 on the high-vortex rotor rear shaft 2. One embodiment of the key connection portion 13 is provided at the end of the duct body 1. When the air duct 100 and the high-vortex rotor rear shaft 2 are aligned, the key connection portion 13 at the end of the duct body 1 first matches with the key connection matching portion 26 on the high-vortex rotor rear shaft 2 to locate the preliminary installation position of the air duct 100 and the high-vortex rotor rear shaft 2, and then the subsequent installation of the shaft sleeve 11 is realized.

[0053] In the process of installing the duct body 1 to the high-vortex rotor rear shaft 2, preferably, the outer peripheral surface of the sleeve second end 116 of the sleeve 11 is also provided with a rotation anti-slip surface 16. Figure 3 and Figure 5 As shown, when rotating the sleeve, the operator holds the rotating anti-skid surface 16, which can effectively increase the friction when rotating the sleeve 11 to connect with the rear shaft 2 of the high-vortex rotor, play an anti-skid role, and improve the safety of the installation process.

[0054] Furthermore, in order to effectively fix the sleeve 11 on the air duct 100 and ensure the centring degree between the sleeve 11 and the air duct 100, the air duct 100 further includes a centring component. Figure 5As shown, the centering component includes a plurality of centering holes 51 distributed circumferentially at the connecting end 10 and an elastic component 19 arranged in each centering hole 51. The elastic component 19 protrudes outward from the centering hole 51, contacts the inner wall surface of the sleeve 11 and is in a compressed state, thereby achieving centering fit between the sleeve 11 and the catheter body 1.

[0055] On the basis of the above-mentioned embodiment, an embodiment of the elastic component 19 includes a spring 191 and a spherical body 192 pushed outward by the spring 191. By applying elastic force to the inner wall surface of the sleeve 11 through the elastic component 19, the sleeve 11 and the air duct 100 can be tightly matched while having a certain degree of flexibility. The spherical body 192 has a good technical effect, and can also reduce the friction on the inner wall surface of the sleeve 11, thereby improving the durability of the sleeve 11.

[0056] The elastic component 19 is preferably a standard component, which has good replaceability and does not increase the difficulty of replacing parts. When installing the sleeve 11 and the catheter body 1, the elastic component 19 with appropriate elasticity can be selected according to the actual installation situation to achieve effective installation of the sleeve 11 and the catheter body 1.

[0057] Figure 6 The high-vortex rotor rear shaft 2 matched with the above-mentioned air duct 100 is shown. The high-vortex rotor rear shaft 2 has an axially outwardly protruding boss 23, and also has a positioning pin 24 protruding in the peripheral direction and a key connection matching portion 26. The surface of the boss 23 has a thread that matches the spiral positioning pin guide groove 17. The positioning pin 24 is located on the surface of the boss 23 and is adapted to the positioning hole 18. After the boss 23 is slowly screwed into the shaft sleeve 11, multiple positioning pins 24 are all snapped into the positioning holes 18 corresponding to their positions.

[0058] Thus, the duct body 1 is keyed to the keyed mating portion 26 via the keyed portion 13 to achieve phase fixation relative to the high-vortex rotor rear shaft 2. The sleeve first end 115 is sleeved on the outer periphery of the high-vortex rotor rear shaft 2, and the locating pin guide groove 17 provides a guide path for guiding the locating pin 24 to reach the locating hole 18.

[0059] The key connection fitting part 26 and the positioning pin 24 on the high-vortex rotor rear shaft 2 respectively cooperate with the key connection part 13 and the positioning hole 18 on the duct body 1 to achieve self-locking between the high-vortex rotor rear shaft 2 and the air duct 100.

[0060] The air duct 100 and the high-vortex rotor rear shaft 2 utilize the above-mentioned self-locking plug principle to achieve positioning self-locking in one step, and no longer use a threaded structure, thereby avoiding the phenomenon of high-temperature adhesion of the threads. Installation, disassembly, and maintenance are relatively convenient, while ensuring the installation phase, eliminating the imbalance caused by it, reducing vibration, and improving engine performance.

[0061] In combination with the above introduction, it can also be understood that an air bleed assembly includes the above-mentioned air duct 100 and the high-vortex rotor rear shaft 2. The air duct 100 includes a duct body 1, a sleeve 11 and a retaining spring 14. The connecting end 10 of the duct body 1 has a key connection portion 13, a locating pin guide groove 17 and a locating hole 18 formed in the first end 115 of the sleeve, and the high-vortex rotor rear shaft 2 has a locating pin 24 protruding in the peripheral direction and a key connection matching portion 26. The duct body 1 is key-connected with the key connection matching portion 26 through the key connection portion 1, so as to achieve phase fixation of the air duct 100 relative to the high-vortex rotor rear shaft 2. The first end 115 of the sleeve is sleeved on the outer periphery of the high-vortex rotor rear shaft 2, and the locating pin guide groove 17 provides a guide path for guiding the locating pin 24 to reach the locating hole 18, thereby optimizing the installation of the air duct and the high-vortex rotor rear shaft.

[0062] Combine the following Figures 7 to 9 The installation method of the air duct 100 and the high-vortex rotor rear shaft 2 is introduced. Figure 7 As shown, after the sleeve 11 is installed to the duct body 1 on the air duct 100, the duct body 1 is aligned with the axis of the high-vortex rotor rear shaft 2, and the key connection portion 13 of the connecting end 10 is aligned with the key connection mating portion 26 on the high-vortex rotor.

[0063] Then as Figure 8 As shown, the sleeve 11 is rotated so that the key connection part 13 on the sleeve 11 is first aligned with the key connection matching part 26 on the high-turbo rear shaft 2 to ensure the initial alignment of the installation positions of the two. The sleeve 11 is rotated continuously, and the positioning pin 24 and the positioning pin guide groove 17 slide in cooperation. When the sleeve 11 is rotated to the position where the positioning pin 24 reaches the positioning hole 18, the positioning pin 24 slides into the positioning hole 18 on the positioning pin guide groove 17 under the pressing force of the retaining spring 14, forming a self-locking, and the installation is completed as shown in FIG. Fig. 9 The air duct 100 shown is docked and installed with the high-vortex rotor rear shaft 2 .

[0064] During disassembly, first press the sleeve 11 so that the locating pin 24 slides out of the locating hole 18 in the locating pin guide groove 17, thereby disengaging from the locating hole 18, and then rotate the sleeve 11 to achieve disassembly between the high-vortex rotor rear shaft 2 and the air duct 100.

[0065] Through the above-mentioned positioning, pressing, and self-locking installation method, the air duct and the rear shaft of the high-vortex rotor can be installed in place at one time, and the air duct and the rear shaft of the high-vortex rotor can be stably installed without the need to install an anti-rotation clamp. In addition, the above-mentioned installation method can ensure that the installation phase is always consistent during multiple installations, and the high-pressure rotor can be balanced with the air duct, eliminating the imbalance caused by the air duct, ensuring the engine vibration performance and operation safety.

[0066] Although the present invention is disclosed as above in the preferred embodiment, it is not intended to limit the present invention, and any technical personnel in this field can make possible changes and modifications without departing from the spirit and scope of the present invention. For example, considering the position of the high-vortex primary disk, the sleeve is not limited to being installed on the connecting end of the air duct, but can also be loaded on the rear shaft of the high-vortex rotor, and the connecting end of the air duct adopts the same connecting structure as the above-mentioned rear shaft of the high-vortex rotor, so as to realize the structural swap between the air duct and the rear shaft of the high-vortex rotor, and still realize the effective self-locking between the air duct and the rear shaft of the high-vortex rotor. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An air duct, comprising a duct body (1) for draining gas from a compressor rotor, having a connection end (10) for connecting to a rear shaft (2) of a high-vortex rotor, characterized in that: Also includes: A shaft sleeve (11), the shaft sleeve (11) being sleeved on the outer side of the connecting end (10), having a shaft sleeve first end (115) for being close to the high-vortex rotor rear shaft (2), and a shaft sleeve second end (116) opposite to the shaft sleeve first end (115), and also having a positioning pin guide groove (17) and a positioning hole (18) formed in the shaft sleeve first end (115), wherein the positioning pin guide groove (17) is provided on the inner wall of the shaft sleeve first end; and a retaining spring (14) connected to the shaft sleeve (11) and the connecting end (10) at the second end (116) of the shaft sleeve, and used to prevent the shaft sleeve (11) from moving toward the rear shaft (2) of the high-vortex rotor; Wherein, the connecting end (10) of the duct body (1) has a key connection portion (13) for connecting to a key connection fitting portion (26) protruding in the peripheral direction of the high-vortex rotor rear shaft (2); the locating pin guide groove (17) is spiral-shaped, and the locating hole (18) extends outward from the bottom of the locating pin guide groove (17).

2. The air duct according to claim 1, characterized in that The air duct also includes a centering assembly, the centering assembly comprising: A plurality of centering holes (51) distributed in the circumferential direction of the connecting end (10); An elastic component (19) is arranged in each centering hole (51), and the elastic component (19) protrudes outward from the centering hole (51) and contacts the inner wall surface of the shaft sleeve (11) to be in a compressed state.

3. The air duct according to claim 2, characterized in that The elastic component (19) comprises a spring (191) and a spherical body (192) pushed outward by the spring (191).

4. The air duct according to claim 1, characterized in that The outer peripheral surface of the second end (116) of the shaft sleeve is provided with a rotation anti-slip surface (16).

5. The air duct according to claim 1, characterized in that The inner circumference of the second end (116) of the sleeve provides an inner shoulder (47), the outer circumference of the catheter body (1) provides an outer shoulder (49), and the retaining spring (14) is clamped between the inner shoulder (47) and the outer shoulder (49).

6. The bleed air assembly includes an air duct and a high-vortex rotor rear shaft, characterized in that: The air duct is an air duct as claimed in any one of claims 1 to 5, wherein the high-vortex rotor rear shaft (2) has a positioning pin (24) protruding in the peripheral direction and also has a key connection fitting portion (26); The duct body (1) is key-connected with the key-connected mating portion (26) to achieve phase fixation relative to the high-vortex rotor rear shaft (2); The first end (115) of the shaft sleeve is sleeved on the outer periphery of the high-vortex rotor rear shaft (2), and the positioning pin guide groove (17) provides a guide path for guiding the positioning pin (24) to reach the positioning hole (18).

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