Turbine second stage rotor assembly overspeed test fixture

Abstract

The present invention discloses a super-speed test tool for a turbine secondary rotor assembly, including a positioning member and a clamping auxiliary member, wherein: the positioning member includes a positioning shaft and a tensioning bolt, the front end face of the positioning shaft is provided with a convex tooth for coaxial connection with the super-speed tester and a plurality of connecting threaded holes distributed around the convex tooth, a fixed threaded hole is provided at the axis center of the rear end face of the positioning shaft for cooperation with the tensioning bolt; a circle of end teeth engaging with the clamping teeth on the turbine secondary rotor assembly is provided on the end face circumference of the fixed threaded hole; a pin hole is provided on the side of the fixed threaded hole on the rear end face of the positioning shaft for assembling a cylindrical pin; the tensioning bolt includes a coaxially arranged head end, a first positioning section, a second positioning section and a tightening section; the clamping auxiliary member includes a pressure block, a tightening nut and a second locking plate. The present invention can ensure the coaxiality of the super-speed tester and the turbine secondary rotor assembly, and effectively prevent vibration during the test, thereby damaging the tester and parts.

Description

Technical Field

[0001] The present invention relates to the field of test fixtures, and in particular to a turbine secondary rotor assembly over-rotation test fixture. Background Art

[0002] The existing tooling for the second-stage turbine rotor assembly mates with the center hole of the second-stage turbine rotor assembly via a central locating shaft. The end tooth clamps are pressed against the end teeth of the component. A certain tension is applied to the central locating shaft, and then the nut is tightened to transmit torque and achieve a high speed. However, because the clamping end teeth are located on the clamp, it is difficult to ensure the coaxiality of the tester's rotation axis and the axis of the second-stage turbine rotor assembly. This results in significant vibration during testing, making it unsuitable for overspeed testing at high speeds. Summary of the Invention

[0003] The purpose of the present invention is to provide a turbine second-stage rotor assembly overspeed test fixture to solve technical problems such as nut loosening and end tooth pressure block falling off, thereby ensuring the success of the turbine second-stage rotor assembly overspeed test.

[0004] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0005] A turbine secondary rotor assembly overspeed test fixture, comprising a positioning member and a pressing auxiliary member, wherein:

[0006] The positioning member includes a positioning shaft and a tightening bolt. The front end face of the positioning shaft is provided with a convex tooth for coaxial connection with the over-rotation tester and a plurality of connecting threaded holes distributed around the convex tooth. The axis center of the rear end face of the positioning shaft is provided with a fixed threaded hole for cooperating with the tightening bolt. A circle of end teeth is provided on the circumference of the end face of the fixed threaded hole, and the end teeth are engaged with a circle of latching teeth on the side of the central mounting hole of the turbine secondary rotor assembly. A pin hole is provided on the side of the fixed threaded hole on the rear end face of the positioning shaft for assembling a cylindrical pin.

[0007] The tightening bolt includes a coaxially arranged head end, a first positioning section, a second positioning section and a fastening section, wherein the head end and the fastening section are provided with external threads, the head end is screwed into the fixed threaded hole of the positioning shaft, the first positioning section passes through the central mounting hole of the turbine secondary rotor assembly, the second positioning section passes through the assembly cavity inside the pressure block and the end hole at the rear end of the pressure block and is in clearance with the end hole; the fastening section is used to assemble a tightening nut;

[0008] The clamping auxiliary part includes a pressure block, a tightening nut and a second locking plate, wherein: the pressure block has an assembly cavity inside, and a circle of matching surface is provided on the front end surface of the assembly cavity, which is used to cooperate with the end of the central mounting hole of the turbine secondary rotor assembly; an end hole coaxial with the assembly cavity is processed on the rear end surface of the pressure block; the tightening nut is screwed onto the fastening section of the tightening bolt, and the pressure block presses and engages the teeth of the turbine secondary rotor assembly with the end teeth of the positioning shaft under the action of the tightening nut to ensure the coaxiality and reliable connection between the positioning shaft, the turbine secondary rotor assembly and the pressure block; when the tightening nut is installed, the position is self-locked by the first locking plate.

[0009] Furthermore, the super-rotation test fixture further includes a balancing structure:

[0010] The balancing structure includes a ring platform provided on the outer circumference of the rear end of the positioning shaft and the outer circumference of the front end of the pressure block. The ring platform is distributed with balancing threaded holes. When conducting the over-rotation test, the balancing screw is screwed into the balancing threaded hole and locked using the second locking plate.

[0011] Furthermore, the convex teeth are mounted in a centering manner with the concave teeth of the over-rotation tester and are fixed by connecting threaded holes.

[0012] Furthermore, after the end of the tensioning bolt is tightened in the fixed threaded hole, a cylindrical pin is passed through the limiting hole provided on the tensioning bolt and inserted into the pin hole.

[0013] Furthermore, the outer diameter of the first positioning section is smaller than that of the second positioning section.

[0014] Furthermore, in the early stage of the super-speed test preparation, the super-speed test fixture clamps the turbine secondary rotor assembly to perform a dynamic balance test, so that the imbalance is no more than 5g.mm.

[0015] Furthermore, the balancing screws are graded and the weight ratio is as small as possible during the design, making it easier to balance and remove weight from the entire over-rotation test fixture.

[0016] Furthermore, the first locking plate is an annular structure, a protruding plate is provided on the inner side of the first locking plate, and a plurality of raised elastic plates are distributed on the outer circumference of the first locking plate; a positioning groove is provided on the fastening section of the tightening bolt along the axial direction; the first locking plate is sleeved on the fastening section of the tightening bolt during installation, so that the protruding plate is stuck in the positioning groove to limit it, and then the tightening nut is fixed on the fastening section so that the elastic plate fits with the tightening nut to prevent the pressure block from falling off and loosening; the tightening nut applies a certain torque during tightening.

[0017] Furthermore, the second locking piece includes a main body piece and a card; a through hole is opened on the main body piece; the card is set at the lower end of the main body piece, and the card and the main body piece form an L-shaped structure; a pair of eight-shaped positioning pieces are set at the upper end of the main body piece.

[0018] Furthermore, a card slot is provided on the ring platform of the balancing structure. When the second locking plate is installed, the card of the second locking plate is inserted into the card slot, the through hole of the second locking plate passes through the balancing screw, and the positioning plate on the second locking plate fits with the outer hexagonal end of the balancing screw.

[0019] Compared with the prior art, the present invention has the following technical features:

[0020] The turbine secondary rotor assembly overspeed test fixture provided by the present invention can ensure the coaxiality of the overspeed tester and the turbine secondary rotor assembly, and effectively prevent vibration during the test and damage to the tester and parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the test fixture of the present invention clamping a centrifugal impeller;

[0022] Figure 2 It is a structural diagram of the positioning axis;

[0023] Figure 3 It is a structural diagram of the briquette;

[0024] Figure 4 (a) and (b) are the front view and side view of the first locking plate;

[0025] Figure 5 It is a structural diagram of tightening the nut;

[0026] Figure 6 It is a structural diagram of the balancing screw;

[0027] Figure 7 (a) and (b) are the front view and side view of the second locking plate;

[0028] Explanation of the numbers in the figure: 1 tightening bolt, 101 head end, 102 first positioning section, 102 second positioning section, 103 fastening section, 2 tightening nut, 3 first locking plate, 301 convex plate, 302 elastic plate, 4 pressure block, 401 end hole, 402 assembly cavity, 403 matching surface, 5 balancing screw, 6 second locking plate, 601 main body plate, 602 through hole, 603 positioning plate, 604 card, 7 cylindrical pin, 8 positioning shaft, 9 pin hole, 10 turbine secondary rotor assembly, 11 balancing threaded hole, 12 connecting threaded hole, 13 convex tooth, 14 end tooth, 15 ring platform, 16 fixing threaded hole. DETAILED DESCRIPTION

[0029] See also Figures 1 to 7 The present invention discloses a super-rotation test fixture for a turbine secondary rotor assembly, comprising a positioning member and a pressing auxiliary member, wherein:

[0030] The positioning part includes a positioning shaft 8 and a tightening bolt 1. The front end face of the positioning shaft 8 is provided with a convex tooth 13 for coaxial connection with the overspeed tester and a plurality of connecting threaded holes 12 distributed around the convex tooth 13, wherein the convex tooth 13 is installed in a centering manner with the concave tooth of the overspeed tester and is fixed by the connecting threaded hole 13; a fixing threaded hole 16 is provided at the axial center of the rear end face of the positioning shaft 8 for cooperating with the tightening bolt 1; a circle of end teeth 14 is provided on the end face circumference of the fixing threaded hole 16, and the end teeth 14 are engaged with a circle of latching teeth on the side of the central mounting hole of the turbine secondary rotor assembly 10, playing the role of connection and positioning; a pin hole 9 is provided on the rear end face of the positioning shaft 8 on the side of the fixing threaded hole 16 for assembling a cylindrical pin 7; when the end of the tightening bolt 1 is tightened in the fixing threaded hole 16, the cylindrical pin 7 is used to pass through the limiting hole provided on the tightening bolt 1 and inserted into the pin hole 9, thereby preventing the tightening bolt from loosening under high speed conditions.

[0031] The tightening bolt 1 includes a coaxially arranged head end 101, a first positioning section 102, a second positioning section and a fastening section 103, wherein the head end 101 and the fastening section 103 are provided with external threads, the head end 101 is screwed into the fixed threaded hole 16 of the positioning shaft 8, the first positioning section 102 passes through the central mounting hole of the secondary rotor assembly, the second positioning section passes through the assembly cavity 402 inside the pressure block 4 and the end hole 401 at the rear end of the pressure block 4 and is clearance-matched with the end hole 401; the fastening section 103 is used to assemble the tightening nut 2; the outer diameter of the first positioning section 102 is smaller than that of the second positioning section.

[0032] The clamping auxiliary part includes a clamping block 4, a tightening nut 2 and a second locking plate 3, wherein: the clamping block 4 has an assembly cavity 402 inside, and a circle of matching surface 403 is provided on the front end surface of the assembly cavity 402, which is used to cooperate with the end of the central mounting hole of the turbine secondary rotor assembly 10; an end hole 401 coaxial with the assembly cavity 402 is processed on the rear end surface of the clamping block 4; the tightening nut 2 is screwed onto the fastening section 103 of the tightening bolt 1, and the clamping block 4, under the action of the tightening nut 2, presses and engages the teeth of the turbine secondary rotor assembly 10 with the end teeth 14 of the positioning shaft 8 to ensure the coaxiality and reliable connection between the positioning shaft 8, the turbine secondary rotor assembly 10 and the clamping block 4; when the tightening nut 2 is installed, the position is self-locked by the first locking plate 3.

[0033] On the basis of the above technical solution, the super-rotation test fixture further includes a balancing structure:

[0034] The balancing structure includes a ring platform 15 provided on the outer circumference of the rear end of the positioning shaft 8 and the outer circumference of the front end of the pressure block 4. The ring platform 15 is provided with balancing threaded holes 15. When performing the over-rotation test, a certain torque is applied to the balancing threaded hole 15 to screw in the balancing screw 5 and lock it with the second locking piece 6 to prevent the balancing screw 5 from loosening at high speed.

[0035] In preparation for the overspeed test, the overspeed test fixture clamps the turbine's second-stage rotor assembly for dynamic balancing, ensuring the imbalance is no greater than 5g.mm. The number, position, and weight of the balancing screws 5 are set according to actual needs. During the design process, the balancing screws are graded and the weight ratio is minimized to facilitate balancing and weight removal of the entire overspeed test fixture.

[0036] See also Figure 4 The first locking piece 3 is an annular structure, and a protruding piece 301 is provided on the inner side of the first locking piece 3. A plurality of raised elastic pieces 302 are distributed on the outer circumference of the first locking piece 3. A positioning groove is provided on the fastening section 103 of the tightening bolt 1 in the axial direction. When installing, the first locking piece 3 is sleeved on the fastening section 103 of the tightening bolt 1, so that the protruding piece 301 is stuck in the positioning groove to limit it, and then the tightening nut 2 is fixed on the fastening section 103, so that the elastic piece 302 fits with the tightening nut 2 to prevent the pressure block 4 from falling off or loosening. The tightening nut 2 applies a certain torque during tightening.

[0037] See also Figure 7 The second locking piece 6 includes a main body piece 601 and a card 604; a through hole 602 is opened on the main body piece 601; the card 604 is set at the lower end of the main body piece 601, and the card 604 and the main body piece 601 form an L-shaped structure; a pair of eight-shaped positioning pieces 603 are set at the upper end of the main body piece 601.

[0038] The balancing structure's ring platform 15 includes a slot. When the second locking plate 6 is installed, its latch 604 is inserted into the slot, and its through-hole 602 passes through the balancing screw 5. The positioning tab 603 on the second locking plate 6 engages the outer hexagonal edge of the balancing screw 5, ensuring reliable locking. The self-locking design of the locking plate prevents loosening of the connector at high speeds.

[0039] The present invention fixes the turbine secondary rotor assembly 10 on the positioning shaft 8 by tightening the bolts 1, the pressure block 4 and the tightening nut 2. The locking teeth on the side of the turbine secondary rotor assembly 10 are centered with the positioning shaft 8 to ensure that the turbine secondary rotor assembly 10 is highly consistent with the axial center line of the pressure block 4 and the positioning shaft 8. At the same time, the positioning shaft 8 is connected to the overspeed tester with high coaxiality through the convex teeth 13. Therefore, the above-mentioned turbine secondary rotor assembly overspeed test fixture can ensure the coaxiality of the overspeed tester and the turbine secondary rotor assembly 10, effectively preventing vibration during the test and damage to the tester and parts.

[0040] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A turbine secondary rotor assembly overspeed test tool, characterized in that: It includes positioning parts and pressing auxiliary parts, wherein: The positioning member comprises a positioning shaft (8) and a tensioning bolt (1); a convex tooth (13) for coaxial connection with an overspeed tester and a plurality of connecting threaded holes (12) distributed around the convex tooth (13) are arranged on the front end face of the positioning shaft (8); a fixing threaded hole (16) is provided at the axial center of the rear end face of the positioning shaft (8) for cooperating with the tensioning bolt (1); a circle of end teeth (14) is provided on the circumference of the end face of the fixing threaded hole (16), and the end teeth (14) are engaged with a circle of latching teeth on the side of the central mounting hole of the turbine secondary rotor assembly (10); a pin hole (9) is provided on the side of the fixing threaded hole (16) on the rear end face of the positioning shaft (8) for assembling a cylindrical pin (7); The tension bolt (1) comprises a coaxially arranged head end (101), a first positioning section (102a), a second positioning section (102b) and a fastening section (103), wherein the head end (101) and the fastening section (103) are provided with external threads, the head end (101) is screwed into a fixed threaded hole (16) of a positioning shaft (8), the first positioning section (102a) passes through a central mounting hole of a turbine secondary rotor assembly (10), and the second positioning section (102b) passes through an assembly cavity (402) inside a pressing block (4) and an end hole (401) at a rear end of the pressing block (4) and is clearance-matched with the end hole (401); the fastening section (103) is used for assembling a tightening nut (2); The clamping auxiliary component comprises a clamping block (4), a tightening nut (2) and a second locking plate (6), wherein: the clamping block (4) has an assembly cavity (402) inside, and a ring of matching surface (403) is arranged on the front end surface of the assembly cavity (402) for matching with the end of the central mounting hole of the turbine secondary rotor assembly (10); an end hole (401) coaxial with the assembly cavity (402) is processed on the rear end surface of the clamping block (4); the tightening nut (2) is screwed onto the fastening section (103) of the tightening bolt (1), and the clamping block (4) presses and engages the clamping teeth of the turbine secondary rotor assembly (10) with the end teeth (14) of the positioning shaft (8) under the action of the tightening nut (2) to ensure the coaxiality and reliable connection between the positioning shaft (8), the turbine secondary rotor assembly (10) and the clamping block (4); when the tightening nut (2) is installed, the first locking plate (3) is used for position self-locking.

2. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: The super-rotation test fixture also includes a balancing structure: The balancing structure includes a ring platform (15) arranged on the outer circumference of the rear end of the positioning shaft (8) and the outer circumference of the front end of the pressure block (4), and the ring platform (15) is provided with balancing threaded holes (11). When performing an over-rotation test, a balancing screw (5) is screwed into the balancing threaded hole (11) and locked by a second locking plate (6).

3. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: The convex teeth (13) are installed in a centering manner with the concave teeth of the over-rotation tester and are fixed by connecting the threaded holes (12).

4. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: After the end of the tension bolt (1) is tightened in the fixing threaded hole (16), a cylindrical pin (7) is passed through a limiting hole formed on the tension bolt (1) and inserted into the pin hole (9).

5. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: The outer diameter of the first positioning section (102a) is smaller than that of the second positioning section.

6. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: In the early stage of the overspeed test preparation, the turbine secondary rotor assembly (10) is clamped by an overspeed test fixture to perform a dynamic balance test so that the unbalance amount is no greater than 5g.mm.

7. The turbine secondary rotor assembly overspeed test fixture according to claim 2, characterized in that: During the design, the balancing screws (5) are graded and the weight ratio is as small as possible, so that the whole over-rotation test fixture is more easily balanced and weighted.

8. The turbine secondary rotor assembly overspeed test fixture according to claim 1, characterized in that: The first locking plate (3) is an annular structure, a protruding plate (301) is arranged on the inner side of the first locking plate (3), and a plurality of raised elastic plates (302) are distributed on the outer circumference of the first locking plate (3); a positioning groove is provided on the fastening section (103) of the tensioning bolt (1) along the axial direction; when installing, the first locking plate (3) is sleeved on the fastening section (103) of the tensioning bolt (1), so that the protruding plate (301) is stuck in the positioning groove for restriction, and then the tightening nut (2) is fixed on the fastening section (103), so that the elastic plate (302) and the tightening nut (2) are in contact with each other, so as to prevent the pressure block (4) from falling off and loosening; the tightening nut (2) applies a certain torque during tightening.

9. The turbine secondary rotor assembly overspeed test fixture according to claim 2, characterized in that: The second locking piece (6) comprises a main body piece (601) and a card (604); a through hole (602) is provided on the main body piece (601); the card (604) is arranged at the lower end of the main body piece (601), and the card (604) and the main body piece (601) form an L-shaped structure; and a pair of positioning pieces (603) in an eight-shaped shape are arranged at the upper end of the main body piece (601).

10. The turbine secondary rotor assembly overspeed test fixture according to claim 2, characterized in that: A card slot is provided on the ring platform (15) of the balancing structure. When the second locking plate (6) is installed, the card (604) of the second locking plate (6) is inserted into the card slot, the through hole (602) of the second locking plate (6) passes through the balancing screw (5), and the positioning plate (603) on the second locking plate (6) fits with the outer hexagon of the end of the balancing screw (5).

Images