Impeller and blade axial limiting device and dismounting method thereof

Abstract

The invention provides an impeller, a blade axial limiting device and a dismounting method thereof. The blade axial limiting device comprises a baffle, the two radial side edges of the baffle are limited by limiting and stopping structures on the blade disc and the blade respectively, the surface, facing the blade disc, of the baffle is attached to the end face of the blade disc to form sealing, the blade axial limiting device further comprises a decomposing device, and the decomposing device comprises a screw, a rib protruding structure and an operation part. The baffle needle provides a through hole for the decomposition device, the blade disc needle provides a hole part for the decomposition device, and the hole part comprises a threaded hole and a counter bore; the screw rod is in threaded connection with the threaded hole of the hole part; the rib convex structure is received by the counter bore and is stopped by the surface, facing the blade disc, of the baffle; the operation part is exposed out of the through hole to allow application of torque so as to drive the decomposition device, so that the rib convex structure abuts against the baffle, and the surface of the baffle is separated from the end face of the blade disc. The blade axial limiting device is convenient to disassemble, and damage to the surfaces of the blade and the disc in the disassembling process can be avoided.

Description

Technical Field

[0001] The present invention relates to an impeller, an axial position limiting device for blades and a disassembly method thereof, and the blades and the disk of the impeller adopt an axial tenon joint structure. Background Art

[0002] One of the common connection methods between the blades and the disk of an impeller is an axial tenon joint structure. In order to prevent the blades from axially displacing, an axial position limiting device for the blades needs to be installed in front of / behind the blades.

[0003] The patent specification with the publication number "CN 214063315 U" and the invention name "Impeller and Compressor Rotor" discloses an impeller. Among them, a plurality of conventional baffles and special baffles are abutted end to end to form a complete ring. The radial inner sides of each conventional baffle and special baffle are respectively stuck in an annular slot, and the radial outer sides are respectively stuck in corresponding tenon slots; when the foldable baffle is in an unfolded state, it can block the tenons of two adjacent blades on the circumferential two sides to prevent the blade baffle group from rotating integrally; when the foldable baffle is in a folded state, the notch can avoid the tenon to allow the blade baffle group to rotate integrally. Its axial position limiting of the blades is realized through the blade baffle group stuck in the tenon slots of the blades and the annular slots of the rotor disk, and the pressing plate in the prior art can be omitted, which is beneficial to reducing the number of parts of the impeller and optimizing the structure of the impeller.

[0004] For an aeroengine (or a component test piece of a compressor), during the entire life cycle, due to various reasons, such as engine overhaul, replacing blades of the test piece, etc., the blades and the disk need to be repeatedly disassembled and assembled. Due to considerations such as sealing in the single-layer baffle design, the combination of the baffle and the disk is very tight. When disassembling the blades and the disk, it is very easy to damage the surfaces of the blades and the disk, affecting the service life of the blades and the disk. Generally speaking, the costs of the blades and the disk are very expensive, so it is not expected to damage the surfaces of the blades and the disk when disassembling the blades and the disk. Summary of the Invention

[0005] The purpose of the present invention is to provide an axial position limiting device for blades, which is convenient for disassembly and can avoid damaging the surfaces of the blades and the disk during the disassembly process.

[0006] One aspect of the present invention provides an axial position limiting device for blades, including a baffle. The two radial side edges of the baffle are respectively limited by the position limiting and stopping structures on the disk and the blades. The surface of the baffle facing the disk fits with the end face of the disk to form a seal. The axial position limiting device for blades further includes a disassembling device, and the disassembling device includes a screw, a rib convex structure and an operation part;

[0007] The baffle is provided with a perforation for the disassembling device, and the disk is provided with a hole part for the disassembling device. The hole part includes a threaded hole and a counterbore;

[0008] The screw is threadedly connected to the threaded hole of the hole portion;

[0009] The ribbed convex structure is received by the counterbore and is stopped by the surface of the baffle facing the disk;

[0010] The operating portion protrudes from the perforation to allow the application of a moment to drive the disassembling device, so that the ribbed convex structure abuts against the baffle, separating the surface of the baffle from the end face of the disk.

[0011] Furthermore, the baffle has a notch for a disassembly tool to extend into.

[0012] Furthermore, the notch and the perforation are adjacent.

[0013] Furthermore, notches are respectively provided at both circumferential ends of the baffle, and corresponding to the notches, the perforations and the disassembling devices are respectively provided.

[0014] Furthermore, the cooperation between the disassembling device and the perforation plays a role in circumferentially limiting the baffle.

[0015] Furthermore, the operating portion is a flat slot, a Phillips slot or a polygonal groove.

[0016] Another aspect of the present invention provides an impeller, including a disk and a plurality of blades connected to the disk through an axial tenon joint structure, the blades being locked by a blade axial limiting device, and at least one of the blade axial limiting devices being the blade axial limiting device described in any one of the above.

[0017] Another aspect of the present invention is a method for disassembling a blade axial limiting device, including:

[0018] Providing a blade axial limiting device including a baffle and a disassembling device, the disassembling device including a screw, a ribbed convex structure and an operating portion, the baffle providing a perforation for the disassembling device, and the disk providing a hole portion for the disassembling device;

[0019] Applying a moment to the operating portion protruding from the perforation to drive the disassembling device so that the ribbed convex structure abuts against the baffle;

[0020] Separating the surface of the baffle from the end face of the disk.

[0021] Furthermore, the baffle has a notch for a disassembly tool to extend into;

[0022] The separating the surface of the baffle from the end face of the disk includes:

[0023] Insert the disassembling tool into the notch to separate the surface of the baffle from the end face of the impeller disk. Brief Description of the Drawings

[0024] The above and other features, properties and advantages of the present invention will become more apparent from the following description with reference to the drawings and embodiments, where:

[0025] Figure 1 is a schematic view of the impeller before improvement.

[0026] Figure 2 is a cross-sectional view of the impeller before improvement.

[0027] Figure 3 is Figure 2 a partial enlarged view at B in

[0028] Figure 4 is a schematic view of the impeller according to an embodiment of the present invention.

[0029] Figure 5 is Figure 4 a partial enlarged view at C in

[0030] Figure 6 is Figure 4 an exploded view of the impeller shown.

[0031] Figure 7 is Figure 4 the front view of the impeller shown.

[0032] Figure 8 is along Figure 7 a cross-sectional view taken along line D1-D1 or D2-D2 in

[0033] Figure 9 is Figure 8 a partial enlarged view at E in

[0034] Figure 10 is the front view of the baffle according to an embodiment of the present invention.

[0035] Figure 11 is a schematic view of the disassembling device according to an embodiment of the present invention.

[0036] Figure 12 is the front view of the impeller according to an embodiment of the present invention.

[0037] Figure 13 is Figure 12 a partial enlarged view at F in

[0038] Figure 14 is Figure 12 a partial cross-sectional view of the impeller shown.

[0039] Figure 15 It is a schematic flow chart of a disassembly method of a blade axial position limiting device according to an embodiment of the present invention. Detailed implementation manners

[0040] The following embodiments are improvements based on Figures 1 to 3 the impeller shown. As Figures 1 to 3 shown, the impeller includes a disk 200 and a plurality of blades 100 disposed on the outer periphery of the disk 200. The illustrated impeller is a rotor part in one stage of a compressor. The blades 100 are installed in the mortise grooves of the disk 200 through a tenon structure, and at least one end in the axial direction is stopped and limited by a blade axial position limiting device. The blade axial position limiting device is a baffle 301, and a plurality of blade axial position limiting devices are connected end to end in the circumferential direction of the disk 200 to lock the plurality of blades 100 on the outer periphery of the disk 200. The blade axial position limiting device is in close contact with the blades 100 and the disk 200 to form a seal. When disassembling the blades 100 and the disk 200, it is necessary to damage the blade axial position limiting device and then separate the blades 100 and the disk 200, which is very likely to damage the surfaces of the blades 100 and the disk 200.

[0041] Now, embodiments of the present invention will be described in detail, and one or more examples thereof are shown in the drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it is obvious to those skilled in the art that various modifications and changes can be made to the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used with another embodiment to yield yet another embodiment. Therefore, the present invention is intended to cover these modifications and changes that fall within the scope of the appended claims and their equivalents.

[0042] The term "axial direction" is the central axis of the impeller or the direction parallel to the central axis of the impeller, the term "radial direction" is the direction perpendicular to the "axial direction", and the term "circumferential direction" is the direction around the "axial direction".

[0043] Based on Figures 1 to 3 the impeller shown, the blade axial position limiting device improved according to the following embodiments can be easily disassembled, can avoid damaging the surfaces of the blades and the disk during the disassembly process, and thus can improve the service life of the compressor and the aeroengine including it and the economy during its entire life cycle.

[0044] As Figure 4 shown, the impeller includes a disk 200 and a plurality of blades 100 connected by an axial tenon joint structure on the disk 200, and the blades 100 are locked by a blade axial position limiting device. In some embodiments, as Figure 4As shown in the figure, in one embodiment of the present invention, only one axial blade limiting device is improved. If the blade 100 needs to be disassembled, the axial blade limiting device at this position can be disassembled, so that other axial blade limiting devices 302 can move circumferentially to facilitate the disassembly of multiple blades 100. Of course, the impeller may also include two or more axial blade limiting devices improved according to the embodiments of the present invention.

[0045] As Figures 4 to 14 shown, the axial blade limiting device is used to prevent the blade 100 from axially displacing. As Figures 4 to 9 shown, the axial blade limiting device includes a baffle 301 and a disassembling device 400. Specifically, as Figures 9 to 10 shown, the blade 100 has a blade limiting stop structure 101, the disk 200 has a disk limiting stop structure 201, the baffle 301 has a radially outer side 301a and a radially inner side 301b. The radially outer side 301a is limited by the blade limiting stop structure 101, and the radially inner side 301b is limited by the disk limiting stop structure 201. It can be understood that the baffle 301 is snapped into the blade limiting stop structure 101 and the disk limiting stop structure 201. If the blade 100 has a tendency to move axially, the blade limiting stop structure 101 and the disk limiting stop structure 201 generate a resistance force on the baffle 301 in the direction opposite to the moving tendency of the blade 100, and the baffle 301 can thereby prevent the axial movement of the blade 100, and the axial limiting effect on the blade 100 can be achieved.

[0046] As Figures 10 to 13As shown, the disassembling device 400 includes a screw 004, a ribbed convex structure 005, and an operating part 003. The disassembling device 400 can be a pin. The baffle 301 is provided with a perforation 002 for the disassembling device 400, and the impeller disk 200 is provided with a hole part 006 for the disassembling device 400. The hole part 006 includes a threaded hole 006a and a counterbore 006b. When assembling the disassembling device 400, the screw 004 is threadedly connected to the threaded hole 006a, and the ribbed convex structure 005 is received by the counterbore 006b. The baffle 301 has a surface 301c facing the impeller disk 200, and the ribbed convex structure 005 is blocked by this surface 301c. Due to being blocked by the baffle 301, the ribbed convex structure 005 can ensure the firm connection between the disassembling device 400 and the impeller disk 200 during the operation of the impeller. The operating part 003 protrudes from the perforation 002 to allow the application of force or torque to drive the disassembling device 400, so that the ribbed convex structure 005 abuts against the baffle 301 to separate the surface 301c from the end face 202 of the impeller disk 200, facilitating the disassembly of the blade axial limiting device from the impeller. A rotational torque can be applied to the operating part 003 to rotate the operating part 003 relative to the perforation 002; in an embodiment where the screw 004 is replaced with a smooth rod, the operating part 003 has a hole or other coupling structure, and an axial force is applied to the operating part 003 through this coupling structure to pull out the operating part 003 along its axial direction, so that the ribbed convex structure 005 abuts against the baffle 301. The embodiments of the present invention do not limit the type and magnitude of the above-mentioned torque.

[0047] The cooperation between the disassembling device 400 and the perforation 002 plays a circumferential limiting role on the baffle 301. If the baffle 301 and / or other blade axial limiting devices 302 have a tendency to move circumferentially, the disassembling device 400 fixes the baffle 301 to the impeller disk 200 through the perforation 002, which can prevent the baffle 301 and / or other blade axial limiting devices 302 from moving circumferentially and avoid the misalignment of the baffle 301, thereby affecting other blade axial limiting devices 302.

[0048] In some embodiments, the baffle 301 has a notch 001 for a disassembly tool to extend into. The notch 001 can provide space for the disassembly tool, enabling the disassembly tool to extend between the baffle 301 and the impeller disk 200, facilitating the disassembly of the baffle 301. As Figure 10 shown, further, the notch 001 and the perforation 002 are adjacent. In this way, the disassembly tool only needs to extend a small distance and does not need to extend near the center position of the baffle 301 to disassemble the baffle 301 and the disassembling device 400 together, which can improve the disassembly efficiency.

[0049] In some embodiments, notches 001 are respectively provided at both circumferential ends of the baffle 301, and corresponding perforations 002 and disassembling devices 400 are provided for the notches 001 respectively. As Figure 10As shown, a baffle 301 has two notches 001, perforations 002 respectively provided at two circumferential ends and their corresponding disassembling devices 400. The two notches 001 can be symmetrically arranged with respect to the axis of the baffle 301, which is convenient for the connection and disassembly of the baffle 301 and the disk 200. The distance between the two perforations 002 is relatively large, which can improve the stability of the assembly of the baffle 301 and the impeller.

[0050] In some embodiments, as Figure 11 shown, the operating part 003 is a slotted head, a Phillips head or a polygonal groove, which is convenient for the disassembly tool to be inserted into the disassembling device 400 to apply a torque to drive the disassembling device 400 to move or rotate.

[0051] Such as Figure 15 shown, the disassembly method of the blade axial limiting device includes steps S100 to S300:

[0052] In step S100, a blade axial limiting device including a baffle and a disassembling device is provided. The disassembling device includes a screw, a ribbed convex structure and an operating part. The baffle provides a perforation for the disassembling device, and the disk provides a hole part for the disassembling device.

[0053] In step S200, a torque is applied to the operating part exposed from the perforation to drive the disassembling device so that the ribbed convex structure abuts against the baffle.

[0054] In step S300, the surface of the baffle is separated from the end face of the disk.

[0055] In some embodiments, in step S200, a screwdriver can be inserted into the groove of the operating part to apply a rotational torque to the operating part to facilitate the screwing out of the disassembling device.

[0056] In some embodiments, step S300 includes step S310:

[0057] In step S310, the disassembly tool is inserted into the notch to separate the surface of the baffle from the end face of the disk.

[0058] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. Blade axial limiting device, including a baffle plate, the two radial sides of the baffle plate are respectively limited by the limiting and stopping structures on the disk and the blade, and the surface of the baffle plate facing the disk fits with the end face of the disk to form a seal. Characterized in that, The blade axial limiting device further includes a disassembling device, and the disassembling device includes a screw, a rib convex structure and an operating part; The baffle plate is provided with a perforation for the disassembling device, and the disk is provided with a hole part for the disassembling device, and the hole part includes a threaded hole and a counterbore; The screw is threadedly connected to the threaded hole of the hole part; The rib convex structure is received by the counterbore and stopped by the surface of the baffle plate facing the disk; The operating part protrudes from the perforation to allow the application of force or torque to drive the disassembling device, so that the rib convex structure abuts against the baffle plate, separating the surface of the baffle plate from the end face of the disk.

2. The blade axial limiting device according to claim 1, Characterized in that, The baffle plate has a notch for a disassembly tool to extend into.

3. The blade axial limiting device according to claim 2, Characterized in that, The notch and the perforation are adjacent.

4. The blade axial limiting device according to claim 2 or 3, Characterized in that, Notches are respectively provided at both circumferential ends of the baffle plate, and the perforations and the disassembling devices are respectively arranged corresponding to the notches.

5. The blade axial limiting device according to claim 1, Characterized in that, The cooperation between the disassembling device and the perforation plays a circumferential limiting role on the baffle plate.

6. The blade axial limiting device according to claim 1, Characterized in that, The operating part is a flat slot, a cross slot or a polygonal groove.

7. An impeller, including a disk and a plurality of blades connected to the disk through an axial tenon joint structure, and the blades are locked by the blade axial limiting device. Characterized in that, At least one of the blade axial limiting devices is the blade axial limiting device according to any one of claims 1 to 6.

8. A disassembly method for a blade axial limiting device, Characterized in that, The blade axial limiting device is the blade axial limiting device according to any one of claims 1 to 6, and the disassembly method includes: Providing a blade axial limiting device including a baffle plate and a disassembling device, the disassembling device includes a screw, a rib convex structure and an operating part, the baffle plate is provided with a perforation for the disassembling device, and the disk is provided with a hole part for the disassembling device; Applying force or torque to the operating part protruding from the perforation to drive the disassembling device so that the rib convex structure abuts against the baffle plate; Separating the surface of the baffle plate from the end face of the disk.

9. The disassembly method for a blade axial limiting device according to claim 8, Characterized in that, The baffle plate has a notch for a disassembly tool to extend into; The separating the surface of the baffle plate from the end face of the disk includes: Inserting the disassembly tool into the notch to separate the surface of the baffle plate from the end face of the disk.

Images