Turbine impeller overspeed test fixture

Abstract

The present invention discloses a turbine impeller overspeed test fixture, comprising a first adapter shaft, a second adapter shaft, a clamping auxiliary part and a balancing structure; a convex part for coaxially connecting with an overspeed tester and a plurality of threaded inner holes distributed around the convex part are arranged on the front end surface of the first adapter shaft, and the first adapter shaft, the second adapter shaft and the turbine impeller are coaxially arranged; the clamping auxiliary part comprises a tension bolt, a locking nut and a first locking plate; the balancing structure comprises a balancing screw and a second locking plate. The present invention can ensure that the first adapter shaft, the second adapter and the turbine impeller are highly coaxial, and effectively prevent the tester and parts from being damaged by vibration during the test.

Description

Technical Field

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

[0002] The existing turbine impeller overspeed test fixture connects the two end adapter shafts through multiple holes, and the screws connecting to the equipment are easy to break and difficult to assemble; the overspeed test fixture materials often have crack defects; the locking plate is easily straightened and broken during the overspeed test; it is difficult to balance and remove weight during overall dynamic balancing; the fixture has poor anti-loosening function and obvious vibration during the test, so it cannot be used for overspeed tests at high speeds. Summary of the invention

[0003] The purpose of the present invention is to provide a turbine impeller overspeed test fixture to solve the technical problems existing in the prior art such as loose nuts and difficult assembly of tension bolts, thereby ensuring the success of the turbine impeller overspeed test.

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

[0005] A turbine impeller overspeed test fixture comprises a first adapter shaft, a second adapter shaft, a clamping auxiliary part and a balancing structure, wherein:

[0006] The front end surface of the first adapter shaft is provided with a convex portion for coaxial connection with the super-rotation tester and a plurality of threaded inner holes distributed around the convex portion, and mutually matching buckling parts are distributed at the rear end of the first adapter shaft and the front end of the second adapter shaft, and the turbine impeller is installed between the two buckling parts, and a mounting groove matching the shape of the center part of the turbine impeller is processed on the side wall of the buckling part; the first adapter shaft, the second adapter shaft and the turbine impeller are coaxially arranged;

[0007] A plurality of matching connection positioning holes are distributed on the circumference of the buckle piece of the first adapter shaft and the buckle piece of the second adapter shaft, and an anti-rotation groove is processed at the end of the connection positioning hole of the buckle piece of the first adapter shaft; a fixing hole coaxial with the connection positioning hole is provided on the turbine impeller; and corresponding balancing threaded holes are also distributed on the circumference of the buckle piece of the first adapter shaft and the buckle piece of the second adapter shaft;

[0008] The clamping auxiliary component includes a tensioning bolt, a locking nut, and a first locking plate; wherein an anti-rotation surface cooperating with the anti-rotation groove is processed on the side surface of the head end of the tensioning bolt; the middle section and the tail section of the tensioning bolt pass through the connection positioning holes on the two buckling parts and the fixing hole on the turbine impeller to ensure that the first adapter shaft, the second adapter shaft and the turbine impeller are coaxial; the first locking plate is assembled at the end of the connection positioning hole of the buckling part of the second adapter shaft, and is tightened on the tail section of the tensioning bolt through the locking nut, and the locking nut is self-locked by the first locking plate;

[0009] The balancing structure comprises a balancing screw and a second locking plate. The balancing screw is assembled in a balancing threaded hole on a buckling member of the first adapter shaft and / or the second adapter shaft, and is locked in position by the second locking plate.

[0010] Furthermore, the surface of the tension bolt is silver-plated, and is divided into a head end, a middle section and a tail section, and the outer diameter decreases step by step.

[0011] Furthermore, the surface of the middle section of the tension bolt is smooth, and the tail section is provided with an external thread.

[0012] Furthermore, in the early stage of the super-speed test preparation, the super-speed test fixture clamps the turbine impeller for a dynamic balance test, and the unbalance amount is no more than 5g.mm.

[0013] Furthermore, the first locking plate and the second locking plate have the same structure, both comprising a main body plate and a card; a through hole is provided on the main body plate; the card is arranged at the lower end of the main body plate, and the card and the main body plate form an L-shaped structure; a pair of eight-shaped positioning plates are arranged at the upper end of the main body plate.

[0014] Furthermore, a card slot is provided on the buckle part. When the first locking plate and the second locking plate are installed, the cards of the first locking plate and the second locking plate are inserted into the card slot, the through holes on the first locking plate and the second locking plate pass through the tightening bolt or the balancing screw, and the positioning plates on the first locking plate and the second locking plate fit with the outer hexagon of the locking nut or the outer hexagon of the end of the balancing screw to ensure the reliability of locking.

[0015] Furthermore, the balancing screws are graded during design so that their counterweight ratio is as small as possible.

[0016] Furthermore, the material of the super-speed test fixture is 1Cr12Ni2W2MoV, which has the same physical and chemical properties as the turbine impeller, and is strictly tested for cracks and physical and chemical properties by magnetic particle detection.

[0017] Compared with the prior art, the present invention has the following technical features:

[0018] The present invention can ensure that the first adapter shaft, the second adapter shaft and the turbine impeller are highly coaxial, and effectively prevent vibration during the test from damaging the tester and parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the test fixture of the present invention for clamping a turbine impeller;

[0020] Figure 2 is a schematic diagram of the first transfer shaft;

[0021] Figure 3 is a schematic diagram of the second transfer shaft;

[0022] Figure 4This is a schematic diagram of the balance screw;

[0023] Figure 5 (a) and (b) are the front view and side view of the locking plate;

[0024] Figure 6 (a) and (b) are the front view and side view of the tensioning bolt.

[0025] Explanation of the accompanying drawings: 1 first adapter shaft, 2 tightening bolt, 21 head end, 22 middle section, 23 tail section, 3 locking nut, 4 first locking plate, 41 main body plate, 42 through hole, 43 positioning plate, 44 card, 5 second adapter shaft, 6 balancing screw, 7 second locking plate, 8 turbine impeller, 9 convex portion, 10 threaded inner hole, 11 balancing threaded hole, 12 connecting positioning hole, 13 anti-rotation groove, 14 mounting groove. DETAILED DESCRIPTION

[0026] See also Figures 1 to 6 A turbine impeller overspeed test fixture of the present invention comprises a first adapter shaft 1, a second adapter shaft 5, a clamping auxiliary part and a balancing structure, wherein:

[0027] The front end surface of the first adapter shaft 1 is provided with a convex portion 9 for coaxial connection with the overspeed tester and a plurality of threaded inner holes 10 distributed around the convex portion 9, wherein the convex portion 9 is installed in a centering manner with the concave teeth on the overspeed tester; mutually matching fastening parts are distributed at the rear end of the first adapter shaft 1 and the front end of the second adapter shaft 5, and the turbine impeller 8 is installed between the two fastening parts, and a mounting groove 14 matching the shape of the central part of the turbine impeller 8 is processed on the side wall of the fastening part; the first adapter shaft 1, the second adapter shaft 5 and the turbine impeller 8 are coaxially arranged;

[0028] A plurality of matching connection positioning holes 12 are distributed on the circumference of the fastening piece of the first adapter shaft 1 and the fastening piece of the second adapter shaft 5, and an anti-rotation groove 13 is processed at the end of the connection positioning hole 12 of the fastening piece of the first adapter shaft 1; a fixing hole coaxial with the connection positioning hole 12 is provided on the turbine impeller 8; and balancing threaded holes 11 corresponding in position are also distributed on the circumference of the fastening piece of the first adapter shaft 1 and the fastening piece of the second adapter shaft 5;

[0029] The clamping auxiliary part includes a tensioning bolt 2, a locking nut 3, and a first locking plate 4, wherein the surface of the tensioning bolt 2 is silver-plated, and is divided into a head end 21, a middle section 22, and a tail section 23, and the outer diameter decreases step by step. An anti-rotation surface cooperating with the anti-rotation groove 13 is processed on the side of the head end 21 of the tensioning bolt 2 to prevent the tensioning bolt 2 from loosening and falling off under high speed; the surface of the middle section 22 of the tensioning bolt 2 is smooth, and the tail section 23 is provided with an external thread; the middle section 22 and the tail section 23 of the tensioning bolt 2 pass through the connecting positioning holes 12 on the two fastening parts and the fixing holes on the turbine impeller 8 to ensure that the first adapter shaft 1, the second adapter shaft 5 and the turbine impeller 8 are coaxial; the first locking plate 4 is assembled at the end of the connecting positioning hole 12 of the fastening part of the second adapter shaft 5, and is tightened on the tail section 23 of the tensioning bolt 2 by applying torque through the locking nut 3, and the locking nut 3 is self-locked by the first locking plate 4 to prevent the locking nut 3 from loosening when rotating at high speed;

[0030] The balancing structure includes a balancing screw 6 and a second locking plate 7 . The balancing screw 6 is assembled in a balancing threaded hole 11 on the fastening member of the first adapter shaft 1 and / or the second adapter shaft 5 by applying a torque, and is locked in position by the second locking plate 7 .

[0031] In the early stage of the super-speed test preparation, the super-speed test fixture clamps the turbine impeller 8 to perform a dynamic balance test, and the unbalance amount is not greater than 5g.mm.

[0032] See also Figure 5 The first locking piece 4 and the second locking piece 7 have the same structure, both including a main body piece 41 and a card 44; a through hole 42 is opened on the main body piece 41; the card 44 is arranged at the lower end of the main body piece 41, and the card 44 and the main body piece 41 form an L-shaped structure; a pair of eight-shaped positioning pieces 43 are arranged at the upper end of the main body piece 41.

[0033] The buckle is provided with a card slot, when the first locking piece 4 and the second locking piece 7 are installed, the card 44 of the first locking piece 4 and the second locking piece 7 is inserted into the card slot, the through hole 42 on the first locking piece 4 and the second locking piece 7 passes through the tension bolt 2 or the balance screw 6, and the positioning piece 43 on the first locking piece 4 and the second locking piece 7 fits with the outer hexagon of the locking nut 3 or the outer hexagon of the end of the balance screw 6 to ensure the reliability of locking. The locking piece is designed to be self-locking to prevent the connector from loosening at high speed.

[0034] The number, position and weight of the balancing screws 6 are set according to actual needs. The balancing screws are graded and the weight ratio is as small as possible during design, making it easier to balance and deweight the entire over-rotation test fixture.

[0035] In this solution, since the surface of the tension bolt 2 is silver-plated and divided into three decreasing sizes, the problem of the tension bolt 2 being difficult to assemble is solved; for the threaded inner hole 10 connected to the over-rotation tester, a thread gauge is designed to measure the threaded hole to improve the position accuracy verification.

[0036] The material of the super-speed test fixture is Class I forgings, and the material is 1Cr12Ni2W2MoV, which has the same physical and chemical properties as the turbine impeller. Strict magnetic particle detection of cracks and physical and chemical properties is carried out to ensure the stability of the fixture during high-speed rotation.

[0037] 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, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A turbine impeller overspeed test tool, characterized in that: The invention comprises a first transfer shaft (1), a second transfer shaft (5), a pressing auxiliary component and a balancing structure, wherein: The front end surface of the first adapter shaft (1) is provided with a convex portion (9) for coaxial connection with the overspeed tester and a plurality of threaded inner holes (10) distributed around the convex portion (9); the rear end of the first adapter shaft (1) and the front end of the second adapter shaft (5) are provided with mutually matching fastening parts, the turbine impeller (8) is installed between the two fastening parts, and the side wall of the fastening parts is processed with a mounting groove (14) that matches the shape of the center part of the turbine impeller (8); the first adapter shaft (1), the second adapter shaft (5) and the turbine impeller (8) are coaxially arranged; A plurality of matching connection positioning holes (12) are distributed on the circumference of the fastening piece of the first transfer shaft (1) and the fastening piece of the second transfer shaft (5), and an anti-rotation groove (13) is processed at the end of the connection positioning hole (12) of the fastening piece of the first transfer shaft (1); a fixing hole coaxial with the connection positioning hole (12) is provided on the turbine impeller (8); and balancing threaded holes (11) corresponding in position are also distributed on the circumference of the fastening piece of the first transfer shaft (1) and the fastening piece of the second transfer shaft (5); The clamping auxiliary component comprises a tensioning bolt (2), a locking nut (3), and a first locking plate (4); wherein an anti-rotation surface cooperating with the anti-rotation groove (13) is processed on the side of the head end (21) of the tensioning bolt (2); the middle section (22) and the tail section (23) of the tensioning bolt (2) pass through the connection positioning holes (12) on the two buckling parts and the fixing holes on the turbine impeller (8) to ensure that the first adapter shaft (1), the second adapter shaft (5) and the turbine impeller (8) are coaxial; the first locking plate (4) is assembled at the end of the connection positioning hole (12) of the buckling part of the second adapter shaft (5), and is tightened on the tail section (23) of the tensioning bolt (2) through the locking nut (3), and the locking nut (3) is self-locked by the first locking plate (4); The balancing structure comprises a balancing screw (6) and a second locking plate (7); the balancing screw (6) is assembled in a balancing threaded hole (11) on a buckling part of the first transfer shaft (1) and / or the second transfer shaft (5), and is locked in position by the second locking plate (7).

2. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The surface of the tension bolt (2) is silver-plated and is divided into a head end (21), a middle section (22) and a tail section (23), and the outer diameter decreases step by step.

3. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The middle section (22) of the tension bolt (2) has a smooth surface, and the tail section (23) is provided with an external thread.

4. The turbine impeller overspeed test fixture according to claim 1, characterized in that: In the early stage of the super-speed test preparation, the super-speed test fixture clamps the turbine impeller (8) to perform a dynamic balance test, and the unbalance amount is not greater than 5g.mm.

5. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The first locking piece (4) and the second locking piece (7) have the same structure, and both comprise a main body piece (41) and a card (44); a through hole (42) is provided on the main body piece (41); the card (44) is arranged at the lower end of the main body piece (41), and the card (44) and the main body piece (41) form an L-shaped structure; and a pair of positioning pieces (43) in an eight-shaped shape are arranged at the upper end of the main body piece (41).

6. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The buckle member is provided with a card slot. When the first locking piece (4) and the second locking piece (7) are installed, the card (44) of the first locking piece (4) and the second locking piece (7) are inserted into the card slot, the through hole (42) on the first locking piece (4) and the second locking piece (7) passes through the tensioning bolt (2) or the balancing screw (6), and the positioning piece (43) on the first locking piece (4) and the second locking piece (7) fits with the outer hexagon of the locking nut (3) or the outer hexagon of the end of the balancing screw (6) to ensure the reliability of locking.

7. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The balancing screw (6) is graded during design so that its counterweight ratio is as small as possible.

8. The turbine impeller overspeed test fixture according to claim 1, characterized in that: The material of the super-speed test fixture is 1Cr12Ni2W2MoV, which has the same physical and chemical properties as the turbine impeller, and is strictly tested for cracks and physical and chemical properties by magnetic particle detection.

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