Blade root lockhole device for integral forging rotor of steam turbine

Abstract

The utility model discloses a steam turbine integral forging rotor blade root lock hole device which comprises a rotor and a tail blade, a blade root is arranged on the tail blade, a limiting assembly is arranged on the inner side face of the rotor, and a locking assembly is arranged on one side of the limiting assembly. According to the utility model, the guide rod on the second threaded hole passes through the guide hole in the bolt, the bolt cap is screwed to rotate through an external tool while passing through the guide rod, and the bolt is driven to be matched and fixed in the first threaded hole in the locking block while rotating, so that the bolt is in threaded fixation with the second threaded hole in the rotor; meanwhile, a locking block and a limiting block are extruded, and a reset spring outside the telescopic rod drives the limiting block to contract, so that when the limiting block is in contact with a limiting hole, the reset spring drives the limiting block connected with the telescopic rod to be matched and fixed with the limiting hole due to counter-acting force; and the blade root connected with the locking block is limited while simple installation is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of locking hole devices, in particular to a locking hole device for a steam turbine integrally forged rotor blade root. Background Art

[0002] The blade root groove on the rotor cooperates with the blade root at the bottom of the moving blade, so that the blade is installed on the rotor, and the moving blade is locked on the rotor by a locking device. Each rotor is provided with one or two end blades to limit the circumferential movement of other moving blades on the rotor body, thereby preventing the moving blades from falling off.

[0003] The patent document with publication number CN 213807764 U discloses a locking device for the last blade on a steam turbine rotor. Before assembling the last blade, the first gourd-shaped tooth surface on the first half nail is matched with the second gourd-shaped tooth surface on the rotor blade root groove, and the first gourd-shaped tooth surface on the second half nail is matched with the second gourd-shaped tooth surface on the blade root of the last blade. The above locking requires the mutual cooperation of the first half nail and the second half nail for locking, and the locking method is relatively cumbersome. Therefore, an improvement is now made to a steam turbine integral forging rotor blade root locking hole device. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a turbine forged rotor blade root locking device. Through the limiting cooperation of the locking assembly and the limiting assembly, the locking device is more convenient and quick, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model proposes a turbine forged rotor blade root locking hole device, comprising a rotor and a last blade, the last blade being provided with a blade root, the inner side surface of the rotor being provided with a limit assembly, one side of the limit assembly being provided with a locking assembly, the locking assembly comprising locking blocks fixedly connected to both sides of the outer side of the blade root, the internal threaded sleeve of the locking block being provided with a bolt, the top of the bolt being provided with a bolt cap, the bolt passing through one side of the locking block and being fixedly connected to the rotor.

[0006] Preferably, the limit assembly comprises a telescopic rod fixedly mounted on the inner side of the rotor, one end of the telescopic rod is connected to a limit block, and a return spring is sleeved between the limit block and the telescopic rod.

[0007] Preferably, a first threaded hole is provided inside the locking block, and the bolt is threadably matched with the locking block.

[0008] Preferably, a second threaded hole is provided on the top of the rotor, and the bolt passes through one side of the locking block and is threadedly connected to the second threaded hole.

[0009] Preferably, a limiting hole is provided on one side of the locking block close to the limiting block, and the limiting block is fitted and fixed in the limiting hole.

[0010] Preferably, two fixing blocks are provided on the top of the rotor.

[0011] Preferably, a guide rod is installed at the center of the second threaded hole, a guide hole is opened inside the bolt, and the bolt is movably sleeved in the guide rod.

[0012] The steam turbine integral forging rotor blade root locking device proposed by the utility model can bring the following beneficial effects:

[0013] By passing the guide hole on the bolt through the guide rod on the second threaded hole, the bolt nut is twisted and rotated by an external tool while passing through, and the bolt is driven to cooperate and fix in the first threaded hole inside the locking block while rotating, and then the bolt is threadedly fixed to the second threaded hole on the rotor, and at the same time, the locking block and the limit block are squeezed, and the return spring outside the telescopic rod drives the limit block to contract. When the limit block contacts the limit hole, the reaction force return spring drives the limit block connected to the telescopic rod to fit and fix with the limit hole, thereby ensuring simple installation while limiting the blade root connected to the locking block. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0015] In the attached picture:

[0016] Figure 1 The utility model is a schematic diagram of the overall structure of a steam turbine integrally forged rotor blade root locking device.

[0017] Figure 2 The utility model is a schematic diagram of the overall cross-sectional structure of a steam turbine integrally forged rotor blade root locking hole device.

[0018] Figure 3 The utility model is a steam turbine integral forging rotor blade root locking device Figure 2 Schematic diagram of the structure at point A in the middle.

[0019] In the figure: 1. rotor; 2. blade root; 3. telescopic rod; 4. reset spring; 5. limit block; 6. limit hole; 7. locking block; 8. bolt cap; 9. bolt; 10. second threaded hole; 11. guide rod; 12. first threaded hole; 13. fixing block; 14. last blade. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the overall concept of the utility model, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0021] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more schemes or examples.

[0025] like Figure 1 to Figure 3As shown, an embodiment of the utility model proposes a turbine forged rotor blade root locking hole device, including a rotor 1 and a last blade 14, the last blade 14 is provided with a blade root 2, the inner side surface of the rotor 1 is provided with a limit assembly, one side of the limit assembly is provided with a locking assembly, the locking assembly includes a locking block 7 fixedly connected to both sides of the outer side of the blade root 2, the internal threaded sleeve of the locking block 7 is provided with a bolt 9, the top of the bolt 9 is provided with a bolt cap 8, the bolt 9 passes through one side of the locking block 7 and is fixedly connected to the rotor 1.

[0026] As 2 and Figure 3 As shown, the limit assembly includes a telescopic rod 3 fixedly mounted on the inner side of the rotor, one end of the telescopic rod 3 is connected to a limit block 5, and a return spring 4 is sleeved between the limit block 5 and the telescopic rod 3. The return spring 4 drives the reaction force generated by the telescopic rod 3 to make the limit block 5 fit and fix with the limit hole 6.

[0027] like Figure 1 and Figure 3 As shown, a first threaded hole 12 is provided inside the locking block 7 , and the bolt 9 is threadably matched with the locking block 7 .

[0028] like Figure 3 As shown, a second threaded hole 10 is provided on the top of the rotor 1, and a bolt 9 passes through one side of the locking block 7 and is threadedly connected to the second threaded hole 10. The locking block 7 connected to the outside of the rotor 1 is fixed to the rotor 1 by the bolt 9.

[0029] like Figure 3 As shown, a limiting hole 6 is formed on one side of the locking block 7 close to the limiting block 5, and the limiting block 5 is fitted and fixed with the limiting hole 6. Since the return spring 4 outside the telescopic rod 3 drives the limiting block 5 to contract, when the limiting block 5 contacts the limiting hole 6, the return spring 4 drives the limiting block 5 connected to the telescopic rod 3 to fit and fix with the limiting hole 6 due to the reaction force, so that the bolt 9 can accurately find the second threaded hole 10 fixed with the rotor 1.

[0030] like Figure 3 As shown, two fixing blocks 13 are provided on the top of the rotor 1 to prevent the locking block 7 from deflecting.

[0031] like Figure 3 As shown, a guide rod 11 is installed at the center of the second threaded hole 10, and a guide hole is opened inside the bolt 9. The bolt 9 is movably sleeved in the guide rod 11. The bolt 9 cooperates with the guide rod 11 through the internal guide hole, so that the bolt 9 can be accurately threadedly fixed with the second threaded hole 10 on the rotor 1.

[0032] Working principle:

[0033] When in use, when the blade root 2 moves downward and is placed on the rotor 1 for locking, the first threaded hole 12 on the locking block 7 outside the blade root 2 is passed through the guide rod 11, and then the locking block 7 and the limit block 5 are squeezed while passing through the guide rod 11. Since the return spring 4 outside the telescopic rod 3 drives the limit block 5 to contract, when the limit block 5 contacts the limit hole 6, the return spring 4 drives the limit block 5 connected to the telescopic rod 3 to fit and fix with the limit hole 6 due to the reaction force. At this time, the locking block 7 contacts the bottom of the rotor 1 and is limited and fixed with the fixing block 13. Then, the guide hole on the bolt 9 is passed through the guide rod 11 on the second threaded hole 10. While passing through, the bolt nut 8 is rotated by an external tool. While rotating, the bolt 9 is driven to cooperate and fix in the first threaded hole 12 inside the locking block 7, and then the bolt 9 is threadedly fixed with the second threaded hole 10 on the rotor 1.

[0034] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0035] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A steam turbine rotor blade root locking device forged entirely, comprising a rotor (1) and a last blade (14), wherein the last blade (14) is provided with a blade root (2), characterized in that: A limit assembly is provided on the inner side surface of the rotor (1), and a locking assembly is provided on one side of the limit assembly. The locking assembly comprises locking blocks (7) fixedly connected to two sides of the outside of the blade root (2), and the internal threaded sleeve of the locking block (7) is provided with a bolt (9). A bolt cap (8) is provided on the top of the bolt (9), and the bolt (9) passes through one side of the locking block (7) and is fixedly connected to the rotor (1).

2. A steam turbine rotor blade root locking device forged as a whole according to claim 1, characterized in that: The limit assembly comprises a telescopic rod (3) fixedly mounted on the inner side of the rotor (1), one end of the telescopic rod (3) being connected to a limit block (5), and a return spring (4) being sleeved between the limit block (5) and the telescopic rod (3).

3. The steam turbine integral forging rotor blade root locking device according to claim 1, characterized in that: A first threaded hole (12) is provided inside the locking block (7), and the bolt (9) is threadably matched with the locking block (7).

4. The steam turbine integral forging rotor blade root locking device according to claim 1, characterized in that: A second threaded hole (10) is provided at the top of the rotor (1), and the bolt (9) passes through one side of the locking block (7) and is threadedly connected to the second threaded hole (10).

5. The steam turbine integral forging rotor blade root locking device according to claim 1, characterized in that: A limiting hole (6) is provided on a side of the locking block (7) close to the limiting block (5), and the limiting block (5) is fitted and fixed in the limiting hole (6).

6. The steam turbine integral forging rotor blade root locking device according to claim 1, characterized in that: Two fixing blocks (13) are provided on the top of the rotor (1).

7. The steam turbine integral forging rotor blade root locking device according to claim 4, characterized in that: A guide rod (11) is installed at the center of the second threaded hole (10), a guide hole is opened inside the bolt (9), and the bolt (9) is movably sleeved in the guide rod (11).

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