Compressor wheel removal tool

Abstract

A compressor impeller removal fixture includes a groove on the inner wall of the first interference fit end of the impeller. The fixture comprises: multiple force-bearing plates, each including a first axial extension plate, a first folded portion fixed at one end of the first axial extension plate along its length, and a protrusion on the other side; and a limiting plate including a second axial extension plate, with a second folded portion fixed at one end of the second axial extension plate along its length. The first and second axial extension plates are circumferentially spliced ​​to form a tubular structure that matches the inner wall of the bore. The protrusion is located on the outer wall of the tubular structure, and the first and second folded portions form an annular structure with an outer diameter larger than the diameter of the inner bore. When removing the impeller, the protrusion engages with the groove, and the annular structure is located outside the first interference fit end. The annular structure applies axial tension to the impeller, thereby achieving non-destructive removal of the impeller and reducing the maintenance cost of the compressor.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, and in particular to a tooling for removing a compressor impeller. Background Technology

[0002] As a key component of a gas turbine, the compressor provides the required air for combustion and cooling. It is the component with the highest internal power consumption in a gas turbine, with speeds reaching 2000 rpm or even higher. Therefore, the dynamic balance of the compressor rotor system itself is crucial. One axial end of the compressor impeller is a first interference fit, and the other end of the compressor has a second interference fit on the base plate. Multiple blades are located between the first interference fit and the base plate. A through hole is located at the radial center of the impeller, penetrating both the first and second interference fits. This through hole is used to pass a tie rod. The first interference fit is interlocked with a coupling, and the second interference fit is interlocked with a thick sleeve to ensure the coaxiality of the rotor system components. A nut located inside the first interference fit is connected to the tie rod to axially limit the impeller.

[0003] After assembly, compressors inevitably require disassembly and maintenance. When removing the coupling and nut, the first interference fit and blades on the impeller are precision structures. Applying excessive tension to the impeller through the outer periphery of the first interference fit blades can damage the first interference fit and blades, leading to the scrapping of the impeller. When reassembling the compressor, a new impeller needs to be replaced, increasing the compressor's maintenance costs. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a compressor impeller removal tooling, thereby achieving non-destructive disassembly of the impeller and reducing the maintenance cost of the compressor.

[0005] The technical solution adopted in this utility model is as follows: A compressor impeller removal fixture, wherein a groove is provided on the inner wall of the first interference fit end of the impeller, the fixture comprising: The force-bearing plates are in multiple pieces. Each force-bearing plate includes a first axial extension plate and a first folded portion fixed to one end of the first axial extension plate along its length. The other end of the first axial extension plate has a protrusion. The limiting piece includes a second axial extension piece, one end of which is fixed with a second folded portion. The first axial extension piece and the second axial extension piece are circumferentially spliced ​​together along the width direction of the first axial extension piece and the second axial extension piece to form a tubular structure that matches the wall of the inner hole. The protrusion is located on the outer wall surface of the tubular structure. At the same time, the first folded portion and the second folded portion form an annular structure. The outer diameter of the annular structure is larger than the diameter of the inner hole. When the impeller is removed, the first axial extension piece and the second axial extension piece are attached to the wall of the inner hole to form the tubular structure. At the same time, the protrusion is engaged with the groove. The annular structure is located outside the first interference fit end, and the annular structure applies axial tension to the impeller.

[0006] As a further improvement to the above technical solution: The groove is annular along the circumference of the inner hole wall.

[0007] Also includes: mandrel; A top cap assembly is provided with a threaded hole for threaded connection with the middle part of the top rod. The top cap assembly includes a pair of detachably connected top cap blocks, which, when detachably connected, form an annular groove for accommodating the annular structure. When the impeller is removed, a tie rod fixed relative to the thick sleeve is provided in the through hole of the impeller. When a tensile force is applied to the annular structure, the annular structure is located in the annular groove. The threaded hole corresponds to the inner hole. The middle part of the push rod is connected to the threaded hole. One end of the push rod is in contact with the end of the tie rod. Rotating the other end of the push rod drives the top cap assembly to move along the axial direction of the push rod, and a tensile force is applied to the annular structure through the annular groove.

[0008] Each top cap block has a half groove and a half hole. After two top cap blocks are detachably connected, the two half grooves are joined together to form the annular groove, and the two half holes are joined together to form the threaded hole.

[0009] Each top cap block is provided with a socket, and the top cap assembly also includes a fastener, which is inserted into the sockets on both top cap blocks to detachably connect the two top cap blocks.

[0010] The top rod is a bolt.

[0011] The number of the force-bearing piece and the limiting piece are both two. When the first axial extension piece and the second axial extension piece are circumferentially spliced ​​to form the tubular structure, the two force-bearing pieces are symmetrical about the center line of the tubular structure, and the two limiting pieces are symmetrical about the center line of the tubular structure.

[0012] The first folded portion has a docking structure at both ends along the width direction of the first axial extension piece. The docking structure includes a limiting surface and a supporting surface that are perpendicular to each other. When the first folded portion and the second folded portion are spliced ​​together to form the annular structure, the second folded portion is located between the two opposing limiting surfaces and is in contact with the limiting surfaces. The supporting surface is located on one side of the second folded portion along the length direction of the second axial extension piece and is in contact with the second folded portion.

[0013] It also includes a pin, and the limiting surface is provided with a first semi-circular hole. The second folded part is provided with a second semi-circular hole at both ends along the width direction of the second axial extension piece. When the first folded part and the second folded part are spliced ​​together to form the annular structure, the first semi-circular hole and the second semi-circular hole are joined together to form a circular hole. The pin is installed in the circular hole to connect the first folded part and the second folded part.

[0014] The beneficial effects of this utility model are as follows: This utility model has a compact and reasonable structure and is easy to operate. By pre-setting a groove in the inner wall of the first interference fit end of the impeller, a tubular structure with an annular structure at the end is spliced ​​in the inner hole. The tubular structure is connected to the groove through a protrusion and the annular structure extends out of the end of the first interference fit end. By applying a tensile force to the annular structure, an axial tensile force is indirectly applied to the impeller through the force-bearing plate, so as to achieve non-destructive disassembly of the impeller and reduce the maintenance cost of the compressor.

[0015] This utility model also has the following advantages: (1) By adding a top cap assembly connected to the annular structure, a threaded hole opposite to the inner hole is set on the top cap assembly, and a push rod is installed in the threaded hole. The pull rod in the impeller through hole is used as the force point to convert the force of rotating the push rod into the force of pulling the top cap assembly, and then the force plate applies axial tension to the impeller, which is convenient and labor-saving.

[0016] (2) A tubular structure is formed by radially splicing four circumferentially arranged extension pieces. The first axial extension piece and the second axial extension piece after splicing are symmetrical, so that the tensile force is evenly applied to the first interference connection end.

[0017] (3) A mutually perpendicular limiting surface and a supporting surface are provided at both ends of the first folding part to form a stepped structure that supports and limits the second folding part. When a tension is applied to the annular structure, the annular groove only contacts the first folding part, thus preventing the second folding part from loosening due to the axial tension and affecting the stability of the tubular structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the present invention (when the second interference fit end is disengaged from the thick sleeve).

[0020] Figure 3 This is a schematic diagram of the impeller structure of this utility model (related structures are represented by dashed lines).

[0021] Figure 4 This is an exploded view of the present invention.

[0022] Figure 5This is a schematic diagram of the assembly structure of the force-bearing plate and the limiting plate of this utility model.

[0023] in: 1. Impeller; 11. First interference fit end; 111. Inner hole; 12. Blade; 13. Second interference fit end; 14. Base plate; 2. Tie rod; 3. Thick sleeve; 4. Nut; 5. Groove; 6. Load-bearing plate; 61. First folding part; 611. Limiting surface; 612. Supporting surface; 62. First axial extension plate; 63. Protrusion; 7. Limiting piece; 71. Second folding part; 711. Second semi-circular hole; 72. Second axial extension piece; 8. Top cap assembly; 81. Top cap block; 811. Half groove; 812. Half hole; 813. Insertion hole; 82. Annular groove; 83. Threaded hole; 84. Fastener; 9. Top rod; 10. Pin. Detailed Implementation

[0024] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0025] Example 1: like Figures 1-3 As shown, in this embodiment, the compressor impeller removal fixture has a groove 5 on the inner wall of the first interference fit end 11 of the impeller 1. The fixture includes a force-bearing plate 6 and a limiting plate 7.

[0026] The force-bearing plate 6 is in multiple pieces. Each force-bearing plate 6 includes a first axial extension plate 62 and a first folded portion 61 fixed at one end of the first axial extension plate 62 in the length direction. The other end of the first axial extension plate 62 is provided with a protrusion 63, which is used to engage with the groove 5. The limiting piece 7 includes a second axial extension piece 72. A second folded portion 71 is fixed at one end of the length direction of the second axial extension piece 72. The first axial extension piece 62 and the second axial extension piece 72 are circumferentially spliced ​​along the width direction of the first axial extension piece 62 and the second axial extension piece 72 to form a tubular structure that matches the hole wall of the inner hole 111. The protrusion 63 is located on the outer wall surface of the tubular structure. At the same time, the first folded portion 61 and the second folded portion 71 form an annular structure. The outer diameter of the annular structure is larger than the diameter of the inner hole 111. When the impeller 1 is removed, the first axial extension piece 62 and the second axial extension piece 72 are attached to the wall of the inner hole 111 to form a tubular structure. At the same time, the protrusion 63 is engaged with the groove 5. The annular structure is located outside the first interference connection end 11, and the impeller 1 is subjected to axial tension through the annular structure.

[0027] Specifically, the length directions of the first axial extension piece 62 and the second axial extension piece 72 are as follows: Figure 5 As shown in the Z-direction, the width direction of the first axial extension piece 62 and the second axial extension piece 72 is as follows: Figure 5 As shown in the X direction, the width direction is an arc that matches the outer wall of the tubular structure. The circumferential splicing of the two extension pieces is the splicing between the two arc-shaped ends of the extension pieces.

[0028] The usage process of the compressor impeller removal fixture in this embodiment is as follows: First, ensure that Figure 3 The coupling shown and the nut 4 in the inner hole 111 are removed; Then, the first axial extension piece 62 is inserted into the inner hole 111, so that the protrusion 63 is stuck in the groove 5. Then, the second axial extension piece 72 is inserted between the two first axial extension pieces 62 to form a tubular structure. The second folded part 71 is aligned with the first folded part 61 to form an annular structure. The annular structure is a flange located at the end of the tubular structure. The outer wall of the tubular structure matches the shape of the inner hole 111, so that after the first axial extension piece 62 and the second axial extension piece 72 are spliced ​​in the inner hole 111, the protrusion 63 will not fall out of the groove 5 under the supporting and limiting effect of the second axial extension piece 72 along the circumference of the inner hole 111. In the annular structure, the first folded part 61 and the second folded part 71 support each other along the circumference of the inner hole 111, which is convenient for bearing axial tension.

[0029] Finally, a tensile force is applied to the annular structure to disengage the second interference fit end 13 of the impeller 1 from the thick sleeve 3.

[0030] By pre-setting a groove 5 in the inner hole 111 of the first interference connection end 11 of the impeller 1, a tubular structure with an annular structure at the end is spliced ​​and formed in the inner hole 111. The tubular structure is connected to the groove 5 through the protrusion 63, and the annular structure extends out of the end of the first interference connection end 11. By applying a pulling force to the annular structure, an axial pulling force is indirectly applied to the impeller 1 through the force-bearing plate 6, so as to achieve non-destructive disassembly of the impeller 1 and reduce the maintenance cost of the compressor.

[0031] In another embodiment, such as Figure 3 As shown, the groove 5 is annular along the circumference of the inner hole 111, which facilitates the alignment and installation of the protrusion 63 on the first axial extension piece 62 with the groove 5.

[0032] Example 2: like Figures 1-3 As shown, unlike Embodiment 1, the compressor impeller removal tool in this embodiment also includes a push rod 9 and a top cap assembly 8.

[0033] The top cap assembly 8 is provided with a threaded hole 83, which is used to connect with the middle thread of the top rod 9. The top cap assembly 8 includes a pair of detachably connected top cap blocks 81. The two top cap blocks 81 are detachably connected to form an annular groove 82 for accommodating the annular structure. When the impeller 1 is removed, a tie rod 2 is fixed relative to the thick sleeve 3 in the through hole of the impeller 1. When a tension is applied to the annular structure, the annular structure is located in the annular groove 82. The threaded hole 83 corresponds to the inner hole 111. The middle part of the push rod 9 is connected to the threaded hole 83. One end of the push rod 9 is in contact with the end of the tie rod 2. Rotating the other end of the push rod 9 drives the top cap assembly 8 to move along the axial direction of the push rod 9, and a tension is applied to the annular structure through the annular groove 82.

[0034] Under normal circumstances, such as Figure 1 As shown, the end of the pull rod 2 is located inside the inner hole 111, and the contact method between the push rod 9 and the end of the pull rod 2 is surface contact, and the contact surface is perpendicular to the axis of the pull rod 2.

[0035] When rotating the top rod 9, if the annular groove 82 and the annular structure rotate relative to each other, the top cap assembly 8 can be fixed and limited by hand or auxiliary tools.

[0036] By adding a top cap assembly 8 connected to the annular structure, a threaded hole 83 is provided on the top cap assembly 8 that is opposite to the inner hole 111. A push rod 9 is installed in the threaded hole 83. The pull rod 2 in the through hole of the impeller 1 is used as the force point to convert the force of rotating the push rod 9 into the force of pulling the top cap assembly 8. Then, the force plate 6 applies axial tension to the impeller 1, which is convenient and saves effort.

[0037] In one specific implementation, such as Figure 4 As shown, each top cap block 81 has a half groove 811 and a half hole 812. After the two top cap blocks 81 are detachably connected, the two half grooves 811 are joined together to form an annular groove 82, and the two half holes 812 are joined together to form a threaded hole 83.

[0038] Specifically, after the two top cap blocks 81 are detachably connected, they are symmetrical about a symmetrical plane. When the annular structure is located in the annular groove 82, the symmetrical plane is parallel to the center line of the inner hole 111, and the center line of the threaded hole 83 is located on the symmetrical plane.

[0039] Each top cap block 81 is provided with a socket 813. The top cap assembly 8 also includes a fastener 84, which is inserted into the socket 813 on both top cap blocks 81 to detachably connect the two top cap blocks 81.

[0040] Specifically, each top cap block 81 has at least two insertion holes 813, and the two insertion holes 813 are located on both radial sides of the half hole 812; the fastener 84 is a bolt, the insertion hole 813 on one top cap block 81 is a threaded hole, and the insertion hole 813 on the other top cap block 81 is a through hole.

[0041] By setting two top cap blocks 81 that are radially separated and connected along the inner hole 111, the annular structure is placed in the annular groove 82 while forming the annular groove 82 through radial splicing, which facilitates the assembly and installation of the top cap assembly 8.

[0042] In one specific implementation, such as Figure 4 As shown, the push rod 9 is a bolt. Using a standard part as the push rod 9, a force is applied to the push rod 9 to drive its rotation by using a wrench. The structure is simple and easy to operate.

[0043] In this embodiment, the method of installing the force-bearing plate 6 and the limiting plate 7 in the inner hole 111 is the same. After the force-bearing plate 6 and the limiting plate 7 are installed, the annular groove 82 formed by the two top cap blocks 81 being joined from the radial sides of the annular structure just wraps around the annular structure. There can be a certain gap between the annular groove 82 and the annular structure.

[0044] Then, install the push rod 9 in the threaded hole 83, keep the top cap assembly 8 from rotating, rotate the push rod 9 so that the end of the push rod 9 contacts the end of the pull rod 2, and then continue to rotate the push rod 9 so that the top cap assembly 8 moves along the axial direction of the push rod 9, and apply a pulling force to the annular structure through the annular groove 82 until the impeller 1 is disengaged from the thick sleeve 3.

[0045] Example 3: Based on the above embodiments, the compressor impeller removal tool of this embodiment has two force-bearing plates 6 and two limiting plates 7. When the first axial extension plate 62 and the second axial extension plate 72 are circumferentially spliced ​​to form a tubular structure, the two force-bearing plates 6 are symmetrical about the center line of the tubular structure, and the two limiting plates 7 are symmetrical about the center line of the tubular structure.

[0046] Specifically, such as Figure 5 As shown, the width dimension of the first axial extension piece 62 is preferably greater than the width dimension of the second axial extension piece 72, so as to ensure that the protrusion 63 on the force-bearing piece 6 has sufficient length, so that the protrusion 63 and the annular groove 82 have sufficient contact area, thereby better transmitting the tensile force.

[0047] A tubular structure is formed by radially splicing four circumferentially arranged extension pieces. The first axial extension piece 62 and the second axial extension piece 72 after splicing are symmetrical, so that the tensile force is evenly applied to the first interference connection end 11.

[0048] In this embodiment, the first folding part 61 is provided with docking structures at both ends along the width direction of the first axial extension piece 62. The docking structure includes mutually perpendicular limiting surfaces 611 and supporting surfaces 612. When the first folding part 61 and the second folding part 71 are spliced ​​together to form a ring structure, the second folding part 71 is located between the two opposing limiting surfaces 611 and is in contact with the limiting surfaces 611. The supporting surface 612 is located on one side of the second folding part 71 along the length direction of the second axial extension piece 72 and is in contact with the second folding part 71.

[0049] Specifically, the thickness of the first folded portion 61 is greater than the thickness of the second folded portion 71. Perpendicular limiting surfaces 611 and supporting surfaces 612 are provided at both ends of the first folded portion 61 to form a stepped structure that supports and limits the second folded portion 71. When a tensile force is applied to the annular structure, the annular groove 82 only contacts the first folded portion 61, preventing the second folded portion 71 from loosening due to axial tension and affecting the stability of the tubular structure.

[0050] In this embodiment, a pin 10 is also included. A first semi-circular hole is provided on the limiting surface 611. The second folded part 71 is provided with second semi-circular holes 711 at both ends along the width direction of the second axial extension piece 72. When the first folded part 61 and the second folded part 71 are spliced ​​together to form an annular structure, the first semi-circular hole and the second semi-circular hole 711 are joined to form a circular hole. The pin 10 is installed in the circular hole to connect the first folded part 61 and the second folded part 71.

[0051] Specifically, the pin 10 is tightly fitted with the circular hole to prevent the second folded part 71 and the first folded part 61 from separating.

[0052] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A compressor impeller removal tool, characterized in that: The impeller (1) has a groove (5) on the wall of the inner hole (111) of the first interference fit end (11), and the tooling includes: The force-bearing plate (6) is in multiple pieces. Each force-bearing plate (6) includes a first axial extension plate (62) and a first folded portion (61) fixed at one end of the first axial extension plate (62) in the length direction. The other end of the first axial extension plate (62) is provided with a protrusion (63). The limiting piece (7) includes a second axial extension piece (72), and a second folded portion (71) is fixed at one end of the length direction of the second axial extension piece (72). The first axial extension piece (62) and the second axial extension piece (72) are circumferentially spliced ​​along the width direction of the first axial extension piece (62) and the second axial extension piece (72) to form a tubular structure that matches the hole wall of the inner hole (111). The protrusion (63) is located on the outer wall surface of the tubular structure. At the same time, the first folded portion (61) and the second folded portion (71) form an annular structure. The outer diameter of the annular structure is larger than the diameter of the inner hole (111). When the impeller (1) is removed, the first axial extension piece (62) and the second axial extension piece (72) are attached to the wall of the inner hole (111) to form the tubular structure. At the same time, the protrusion (63) is engaged with the groove (5). The annular structure is located outside the first interference connection end (11) and applies axial tension to the impeller (1) through the annular structure.

2. The compressor wheel removal tool of claim 1, wherein: The groove (5) is annular along the circumference of the inner hole (111) wall.

3. The compressor wheel removal tool of claim 1, wherein: Also includes: Top rod (9); The top cap assembly (8) is provided with a threaded hole (83) for threaded connection with the middle part of the top rod (9). The top cap assembly (8) includes a pair of detachably connected top cap blocks (81). The two top cap blocks (81) are detachably connected to form an annular groove (82) for accommodating the annular structure. When the impeller (1) is removed, a pull rod (2) fixed relative to the thick sleeve (3) is provided in the through hole of the impeller (1). When the annular structure is subjected to tension, the annular structure is located in the annular groove (82). The threaded hole (83) corresponds to the inner hole (111). The middle part of the push rod (9) is connected to the threaded hole (83). One end of the push rod (9) is in contact with the end of the pull rod (2). Rotating the other end of the push rod (9) drives the top cap assembly (8) to move along the axial direction of the push rod (9). The annular structure is subjected to tension through the annular groove (82).

4. The compressor wheel removal tool of claim 3, wherein: Each top cap block (81) has a half groove (811) and a half hole (812). After the two top cap blocks (81) are detachably connected, the two half grooves (811) are joined together to form the annular groove (82), and the two half holes (812) are joined together to form the threaded hole (83).

5. The compressor wheel removal tool of claim 4, wherein: Each top cap block (81) is provided with a socket (813), and the top cap assembly (8) also includes a fastener (84), which is inserted into the socket (813) on both top cap blocks (81) to detachably connect the two top cap blocks (81).

6. The compressor wheel removal tool of claim 3, wherein: The top rod (9) is a bolt.

7. The compressor wheel removal tool of claim 1, wherein: The number of the force-bearing piece (6) and the limiting piece (7) are both two. When the first axial extension piece (62) and the second axial extension piece (72) are circumferentially spliced ​​to form the tubular structure, the two force-bearing pieces (6) are symmetrical about the center line of the tubular structure, and the two limiting pieces (7) are symmetrical about the center line of the tubular structure.

8. The compressor wheel removal tool of claim 7, wherein: The first folding part (61) has a docking structure at both ends along the width direction of the first axial extension piece (62). The docking structure includes a mutually perpendicular limiting surface (611) and a supporting surface (612). When the first folding part (61) and the second folding part (71) are spliced ​​together to form the ring structure, the second folding part (71) is located between the two opposing limiting surfaces (611) and is in contact with the limiting surfaces (611). The supporting surface (612) is located on one side of the second folding part (71) along the length direction of the second axial extension piece (72) and is in contact with the second folding part (71).

9. The compressor wheel removal tool of claim 8, wherein: It also includes a pin (10), the limiting surface (611) is provided with a first semi-circular hole, the second folded part (71) is provided with a second semi-circular hole (711) at both ends along the width direction of the second axial extension piece (72), when the first folded part (61) and the second folded part (71) are spliced ​​together to form the annular structure, the first semi-circular hole and the second semi-circular hole (711) are joined to form a circular hole, and the pin (10) is installed in the circular hole to connect the first folded part (61) and the second folded part (71).

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