A bolt locking assembly for an aircraft engine compressor

Abstract

The application discloses an aviation engine compressor bolt locking assembly, which comprises a locking block with two elastic sheets symmetrically arranged on the top and having execution ends facing away from each other, a locking bolt penetrating through the center hole of the locking block and being threadedly connected with the locking block, a locking sleeve in a square structure and sleeved on the locking bolt above the locking block, a sink groove is formed in the lower end of the locking sleeve for inserting the elastic sheet, and a limiting groove is formed in the sidewall of the sink groove for inserting the execution end of the corresponding side elastic sheet; the assembly further comprises a horizontal moving assembly symmetrically installed on the two sides of the locking sleeve and correspondingly arranged with the limiting groove, the horizontal moving assembly comprises a screw rod and a push plate, the screw rod horizontally penetrates through the locking sleeve and is threadedly connected with the locking sleeve, and the tail end of the screw rod extends into the limiting groove; the push plate is vertically arranged in the limiting groove and is oppositely and slidably arranged with the limiting groove, and the push plate is oppositely and rotationally connected with the tail end of the screw rod; and the top end of the locking bolt is provided with a top ring for preventing the locking sleeve from falling off the locking bolt. The application can improve the locking reliability.

Description

Technical Field

[0001] This invention relates to a bolt locking assembly for an aero-engine compressor, belonging to the field of aero-engine assembly technology. Background Technology

[0002] In the compressor of an aero-engine, the blade's tenon is inserted into the tenon of the rotor disk and locked by a blade locking assembly to prevent the blade from falling off the rotor disk during operation. The locking assembly typically includes a locking block and a locking screw that is threaded into the locking block. When blade positioning is required, the locking screw is tightened, pushing the locking block upwards into place to achieve the positioning purpose. However, relying solely on the locking screw and locking block to lock the blade cannot reliably maintain the tightened state during prolonged operation of the compressor rotor disk. This can lead to relative slippage and loosening, resulting in locking failure and blade detachment, which could cause a serious accident. Summary of the Invention

[0003] The purpose of this invention is to provide a bolt locking assembly for an aero-engine compressor, which solves the problem mentioned in the background art that the existing locking assemblies cannot reliably maintain the tightened state after long-term use, resulting in locking failure.

[0004] The technical solution adopted in this invention is as follows:

[0005] A bolt locking assembly for an aircraft engine compressor includes:

[0006] The locking block has two spring pieces symmetrically arranged on the top, with the actuating ends facing away from each other;

[0007] The locking bolt passes through the center hole of the locking block and is threadedly connected to the locking block;

[0008] The locking sleeve is square in shape and is fitted onto the locking bolt located above the locking block; a countersunk groove is provided at the lower end of the locking sleeve for the insertion of the spring piece, and a limiting groove is provided on the side wall of the countersunk groove for the insertion of the actuating end of the corresponding side spring piece;

[0009] The transverse components are symmetrically installed on both sides of the lock sleeve and corresponding to the limiting groove. Each component includes a screw and a push plate. The screw is horizontally inserted through the lock sleeve and threadedly connected to the lock sleeve. The end of the screw extends into the limiting groove. The push plate is vertically disposed in the limiting groove and is slidably disposed relative to the limiting groove. The push plate is rotatably connected to the end of the screw.

[0010] The top of the locking bolt has a top ring to prevent the locking sleeve from falling off the locking bolt.

[0011] Preferably, it further includes an anti-hair loss component, the anti-hair loss component comprising:

[0012] The support plate has a concave structure, and a through hole is provided on the bottom end of the locking bolt for the support plate to pass through.

[0013] A rotating rod is vertically inserted through the center hole of the locking bolt and extends into the through hole; the surface of the rotating rod located in the center hole of the locking bolt is smooth, and the rotating rod located in the through hole has external threads.

[0014] The bottom end of the swivel rod passes through the support plate and is threadedly connected to the support plate.

[0015] Two limiting plates are symmetrically arranged on the side wall of the swivel rod located inside the through hole and above the support plate.

[0016] Preferably, a rotating hole is provided at the top of the locking bolt, the front end of the screw, and the top of the rotating rod.

[0017] Preferably, the bottom end of the locking bolt has a hemispherical structure.

[0018] Preferably, the locking sleeve has at least one set of corresponding sidewall ends that abut against the inner side arms of the slots on the two rotor blades.

[0019] Preferably, the height from the bottom of the locking block to the top of the spring is less than the depth of the circumferential tenon groove of the wheel.

[0020] Preferably, the length of the support plate is less than the distance between the tenons at the bottom of the two rotor blades.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. After the locking block is lifted by the locking bolt, it can fit into the circumferential tenon groove of the wheel without rotating. Since the locking sleeve is stuck in the groove on the side close to the two rotor blades, and the rotor blades and the wheel cannot rotate relative to each other, after the locking block is lifted, the spring can be inserted into the corresponding limiting groove on the locking sleeve, thereby realizing the locking structure between the locking block and the locking sleeve, which improves the reliability of the locking assembly.

[0023] 2. By setting a support plate in the through hole at the bottom of the locking bolt, which can be lifted or lowered by rotating the rod, after the locking block is lifted, the support plate is lifted by rotating the rod so that the support plate abuts against the bottom of the locking block, which can further improve the reliability of the locking assembly; and because of the presence of the support plate, the locking bolt will not detach from the locking block, and thus the blade will not come off. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the installation of existing compressor blades and impeller;

[0025] Figure 2This is a schematic diagram of the connection between the existing compressor blades and the rotor disc;

[0026] Figure 3 This is a schematic diagram of the initial state of the locking assembly provided by the present invention;

[0027] Figure 4 This is a top view of the locking block.

[0028] Figure 5 This is a schematic diagram showing the state of the locking block of the locking assembly provided by the present invention after it has been lifted.

[0029] Figure 6 This is a schematic diagram showing the state of the locking block support plate of the locking assembly provided by the present invention after it has been lifted.

[0030] The meanings of the main reference numerals in the figure are as follows:

[0031] 1. Wheel, 2. Rotor blade, 3. Locking block, 4. Locking bolt, 5. Lock sleeve, 6. Spring, 7. Circumferential tenon, 8. Center hole, 9. Rotation aid hole, 10. Countersunk groove, 11. Limiting groove, 12. Screw, 13. Push plate, 14. Support plate, 15. Rotating rod, 16. Limiting plate, 17. Top ring. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] When installing the blades onto the wheel, such as Figure 1 As shown, the standard blades are first installed onto the wheel by inserting the tenon at the bottom of the standard blade into the blade insertion slot. Then, four locking blades are installed, and the blades are locked in place using locking blocks (i.e., existing locking components). The locking blades are structurally similar to the standard blades, except that every two locking blades form a group, with corresponding slots and openings formed on the contact surfaces of the two locking blades to allow the screws of the locking blocks to pass through. Figure 2 As shown.

[0034] However, traditional locking blocks only include a locking block and a locking screw that is inserted into the locking block and threadedly connected to the locking block. By rotating the locking screw, the locking block is pushed upwards into place to achieve the purpose of limiting the position, but this type of locking structure has poor reliability.

[0035] This application presents a creative improvement on the traditional locking block, proposing a bolt locking assembly for an aero-engine compressor, such as... Figure 3-6 As shown, it includes a locking block 3, a locking bolt 4, a locking sleeve 5, a transverse movement assembly, and an anti-detachment assembly.

[0036] like Figure 3-6As shown, the top of the locking block 3 is symmetrically provided with two spring pieces 6 with their execution ends facing away from each other, and the height from the bottom of the locking block 3 to the top of the spring piece 6 is less than the depth of the circumferential tenon groove 7 of the wheel 1, so as to allow the locking block 3 and the spring piece 6 to be placed into the circumferential tenon groove 7 of the wheel 1 through the blade insertion groove on the wheel 1; an opening corresponding to the locking block 3 is also provided on the rotor blade 2 for locking.

[0037] The locking bolt 4 passes through the central hole 8 of the locking block 3 and is threadedly connected to the locking block 3. The bottom end of the locking bolt 4 has a hemispherical structure and abuts against the bottom surface of the circumferential tenon groove 7 of the wheel 1. The locking bolt 4 has a central hole 8 and an auxiliary rotation hole 9 is formed at the top of the central hole 8. The locking bolt 4 can be rotated through the auxiliary rotation hole 9, and then the locking block 3 can be lifted by the locking bolt 4.

[0038] The locking sleeve 5 has a square structure and is fitted onto the locking bolt 4 located above the locking block 3. The locking sleeve 5 has at least one set of corresponding side wall ends that abut against the inner side arms of the slots on the two rotor blades 2. It is preferable that the four sides of the locking sleeve 5 have corresponding abutments on the slots on the rotor blades 2. A recessed groove 10 is provided at the lower end of the locking sleeve 5 for the insertion of the spring piece 6 after the locking block 3 is lifted. A limiting groove 11 is provided on the side wall of the recessed groove 10 for the insertion of the actuating end of the corresponding side spring piece 6. The top of the locking bolt 4 also has a top ring 17 to prevent the locking sleeve 5 from falling off the locking bolt 4.

[0039] The transverse moving components are symmetrically installed on both sides of the locking sleeve 5 and are correspondingly set with the limiting groove 11. The transverse moving components include a screw 12 and a push plate 13. The screw 12 is horizontally inserted through the locking sleeve 5 and threadedly connected to the locking sleeve 5. The end of the screw 12 extends into the limiting groove 11. The push plate 13 is vertically set in the limiting groove 11 and is slidably set relative to the limiting groove 11. The push plate 13 is rotatably connected to the end of the screw 12. A rotating hole 9 is also opened at the front end of the screw 12. By screwing the screw 12 in and out, the push plate 13 is driven to move left and right in the limiting groove 11.

[0040] The anti-detachment assembly includes a support plate 14 and a rotating rod 15. The support plate 14 has a concave structure and its length is less than the distance between the bottom tenons of the two rotor blades 2, so that the support plate 14 has enough space to rotate between the bottom tenons of the two rotor blades 2 when the locking bolt 4 rotates. A through hole is opened on the bottom end of the rod of the locking bolt 4 for the support plate 14 to pass through. The rotating rod 15 is vertically inserted through the center hole 8 of the locking bolt 4 and extends into the through hole, and an auxiliary rotating hole 9 is also opened on the top of the rotating rod 15. The surface of the rotating rod 15 located in the center hole 8 of the locking bolt 4 is smooth, and the rotating rod 15 located in the through hole has external threads. The bottom end of the rotating rod 15 passes through the support plate 14 and is threadedly connected to the support plate 14. The end of the rotating rod 15 abuts against the bottom surface of the through hole. Two limiting plates 16 are symmetrically arranged on the side wall of the rotating rod 15 located in the through hole and above the support plate 14. The two limiting plates 16 are identical to prevent the rotating rod 15 from slipping out of the center hole 8.

[0041] When locking the last locking rotor blade 2, first install the two locking rotor blades 2 onto the wheel 1 and push them apart to both sides. Then, insert the two sets of locking components from the blade insertion slots into the tenon slots and slide them to both sides. After installing the last two locking rotor blades 2, push the blades to push the locking components until the locking bolt 4 corresponds to the locking block insertion slot. During the installation of the locking rotor blades 2, lift the locking sleeve 5 upward so that it can finally fall into the square slot formed after the same set of locking rotor blades 2 abuts, and abut against the side wall of the slot.

[0042] The initial state of the locking component is as follows: Figure 3 As shown, when the locking bolt 4 is rotated, the locking block 3 can be lifted due to the limiting structure of the locking block 3 itself and the tenons at the bottom of the locking rotor blades 2 on both sides; see also Figure 5 As shown, after the locking block 3 is lifted, both sides of the locking block 3 will be embedded in the locking block insertion groove, and the actuating end of the spring 6 will be inserted into the limiting groove 11 of the locking sleeve 5; then the rotating rod 15 is rotated, and due to the limiting of the through hole, the tray will be lifted and abut against the bottom end of the locking block 3 to lock the blade.

[0043] When it is necessary to disassemble the locking assembly, see [link / reference]. Figure 6 As shown, first rotate the rotating rod 15 in the opposite direction to move the tray downwards; then rotate the screw 12 to push the push plate 13 inwards, pushing the actuator end of the spring piece 6 out of the limiting groove 11; then rotate the locking bolt 4 in the opposite direction to move the locking block 3 and the spring piece 6 downwards, finally restoring them to their original positions. Figure 3 The state shown.

[0044] After being lifted by the locking bolt, the locking block of the present invention can engage with the circumferential tenon groove of the wheel without rotating. Since the locking sleeve is stuck in the groove on the side close to the two rotor blades, the rotor blades and the wheel cannot rotate relative to each other (in the prior art, downward protrusions are set on both sides of the bottom of the rotor blades and corresponding sliding grooves are opened on the wheel, and anti-rotation is achieved by the protrusions being embedded in the sliding grooves). After the locking block is lifted, the spring can be inserted into the corresponding limiting groove on the locking sleeve, thereby realizing the locking structure between the locking block and the locking sleeve, which improves the reliability of the locking assembly.

[0045] Furthermore, by installing a support plate in the through hole at the bottom of the locking bolt, which can be lifted or lowered by rotating the rod, the support plate can be lifted by rotating the rod after the locking block is lifted, so that the support plate abuts against the bottom of the locking block, which can further improve the reliability of the locking assembly; and because of the presence of the support plate, the locking bolt will not detach from the locking block, and thus the blade will not come off.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bolt locking assembly for an aero-engine compressor, characterized in that, include: The locking block has two spring pieces symmetrically arranged on the top, with the actuating ends facing away from each other; The locking bolt passes through the center hole of the locking block and is threadedly connected to the locking block; The locking sleeve is square in shape and is fitted onto the locking bolt located above the locking block; a countersunk groove is provided at the lower end of the locking sleeve for the insertion of the spring piece, and a limiting groove is provided on the side wall of the countersunk groove for the insertion of the actuating end of the corresponding side spring piece; The transverse components are symmetrically installed on both sides of the lock sleeve and corresponding to the limiting groove. Each component includes a screw and a push plate. The screw is horizontally inserted through the lock sleeve and threadedly connected to the lock sleeve. The end of the screw extends into the limiting groove. The push plate is vertically disposed in the limiting groove and is slidably disposed relative to the limiting groove. The push plate is rotatably connected to the end of the screw. The top of the locking bolt has a top ring to prevent the locking sleeve from falling off the locking bolt.

2. The bolt locking assembly for an aero-engine compressor according to claim 1, characterized in that, It also includes an anti-detachment component, which includes: The support plate has a concave structure, and a through hole is provided on the bottom end of the locking bolt for the support plate to pass through. A rotating rod is vertically inserted through the center hole of the locking bolt and extends into the through hole; the surface of the rotating rod located in the center hole of the locking bolt is smooth, and the rotating rod located in the through hole has external threads. The bottom end of the swivel rod passes through the support plate and is threadedly connected to the support plate. Two limiting plates are symmetrically arranged on the side wall of the swivel rod located inside the through hole and above the support plate.

3. A bolt locking assembly for an aero-engine compressor according to claim 1 or 2, characterized in that, Actuation holes are provided at the top of the locking bolt, the front end of the screw, and the top of the rotating rod.

4. A bolt locking assembly for an aero-engine compressor according to claim 1, characterized in that, The bottom end of the locking bolt has a hemispherical structure.

5. A bolt locking assembly for an aero-engine compressor according to claim 1, characterized in that, The locking sleeve has at least one set of corresponding sidewall ends that abut against the inner side arms of the slots on the two rotor blades.

6. A bolt locking assembly for an aero-engine compressor according to claim 1, characterized in that, The height from the bottom of the locking block to the top of the spring piece is less than the depth of the circumferential tenon groove on the wheel.

7. A bolt locking assembly for an aero-engine compressor according to claim 2, characterized in that, The length of the support plate is less than the distance between the tenons at the bottom of the two rotor blades.

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