A loose structure of a steam turbine blade root

Abstract

This utility model relates to the field of steam turbines, and more particularly to a steam turbine blade root anti-loosening structure. The steam turbine blade root anti-loosening structure includes a main shaft, on which a wheel seat is mounted. A blade is detachably connected to the outer circumference of the wheel seat. The outer circumference of the wheel seat has an axially arranged slot, and the bottom of the slot also has a radially arranged groove. A connecting frame is welded and fixed to one end of the blade, and the connecting frame is installed inside the slot by a tenon and mortise connection. The connecting frame has a cavity inside, and an auxiliary positioning component is arranged inside the cavity. The auxiliary positioning component consists of an insertion part and an adjustment part. In the steam turbine blade root anti-loosening structure provided by this utility model, an auxiliary positioning component is also provided inside the connecting frame at the blade root. That is, the connecting frame can be axially inserted into the slot, and the insertion plate in the auxiliary positioning component can be radially inserted into the groove, realizing multi-level positioning of the blade and giving it higher stability.

Description

Technical Field

[0001] This utility model relates to the field of steam turbines, and in particular to a structure for preventing loosening at the root of steam turbine blades. Background Technology

[0002] A steam turbine is a rotary thermal power machine that uses steam as its working medium. It is mainly used to convert the thermal energy of steam into mechanical energy, thereby driving generators or other mechanical equipment.

[0003] For the installation of blade structures in steam turbines, the blade roots often use fir-shaped, T-shaped, or dovetail tenon structures, while the outer wall of the wheel seat has a corresponding groove structure, and the two are installed by plugging in.

[0004] However, the following defects and shortcomings still exist in the application implementation process:

[0005] During high-speed rotation of blades, fretting wear and loosening are easily caused by vibration, thermal deformation, etc. Therefore, the stability is relatively poor when using mortise and tenon joints alone.

[0006] Therefore, it is necessary to provide a new anti-loosening structure for the root of steam turbine blades to solve the above-mentioned technical problems. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a structure for preventing loosening at the root of steam turbine blades.

[0008] The turbine blade root anti-loosening structure provided by this utility model includes a main shaft, a wheel seat mounted on the main shaft, and a blade detachably connected to the outer circumference of the wheel seat.

[0009] The outer circumferential wall of the wheel seat has an axially arranged slot, and the bottom of the slot also has a radially arranged groove.

[0010] A connecting frame is welded and fixed to one end of the blade, and the connecting frame is installed inside the slot by means of mortise and tenon joints.

[0011] The connecting frame has a cavity inside, and an auxiliary positioning component is installed inside the cavity;

[0012] The auxiliary positioning component consists of a plug-in part and an adjustment part. The plug-in part includes a plug plate. The adjustment part can drive the plug plate to move radially along the wheel seat so that the plug plate is inserted into the groove.

[0013] Preferably, the insertion part further includes a positioning frame, which is welded and fixed to the insertion plate. A positioning rod that is slidably connected passes through the positioning frame. One end of the positioning rod is fixed inside the connecting frame. A spring that abuts against the positioning frame and the inner wall of the connecting frame is also sleeved on the positioning rod.

[0014] Preferably, the connecting frame is also provided with a through opening, and the insert plate can be inserted through the through opening to the outside of the connecting frame.

[0015] Preferably, the insert plate and the groove are fitted bosses.

[0016] Preferably, the adjusting part includes two pressing seats, which are slidably connected to the inside of the connecting frame. A left-right adjusting screw is also rotatably connected inside the connecting frame. The left-right adjusting screw is threadedly connected to both pressing seats and can drive the two pressing seats to move symmetrically. The pressing seat has an inclined surface that can contact the positioning frame and exert pressure on it. One end of the left-right adjusting screw is welded and fixed with an internal hexagonal end.

[0017] Preferably, the inner wall of the connecting frame also has a linear slide rail, and the side wall of the extrusion seat has a linear slide groove, with the linear slide rail embedded inside the linear slide groove.

[0018] Compared with related technologies, the turbine blade root anti-loosening structure provided by this utility model has the following beneficial effects:

[0019] This utility model provides a turbine blade root anti-loosening structure, in which an auxiliary positioning component is also provided inside the connecting frame at the blade root. That is, the connecting frame can be axially inserted into the slot, and the insert plate in the auxiliary positioning component can be radially inserted into the groove, so as to realize multi-level positioning of the blade and make it more stable. Attached Figure Description

[0020] Figure 1 A schematic diagram of a preferred embodiment of the anti-loosening structure for the root of steam turbine blades provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the wheel seat shown in this utility model. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the structure of the wheel seat shown in this utility model. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the blade structure shown in this utility model. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the blade structure shown in this utility model. Figure 2 ;

[0025] Figure 6 This is a schematic diagram of the structure of the plug-in part shown in this utility model. Figure 2 ;

[0026] Figure 7This is a schematic diagram of the structure of the adjustment part shown in this utility model. Figure 2 .

[0027] The following are the labels in the diagram: 1. Main shaft; 2. Wheel seat; 21. Slot; 22. Insert; 3. Blade; 31. Connecting frame; 32. Through-hole; 33. Linear slide rail; 4. Auxiliary positioning assembly; 41. Positioning frame; 42. Insert plate; 43. Positioning rod; 44. Spring; 45. Pressing seat; 46. Linear slide groove; 47. Left and right turning adjusting screw; 48. Hexagonal socket end. Detailed Implementation

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0033] Please see Figures 1 to 7The present invention provides a turbine blade root anti-loosening structure, which includes a main shaft 1, a wheel seat 2 mounted on the main shaft 1, and a blade 3 detachably connected to the outer circumference of the wheel seat 2.

[0034] The outer circumferential wall of the wheel seat 2 has an axially arranged slot 21, and the bottom of the slot 21 also has a radially arranged groove 22.

[0035] One end of the blade 3 is welded and fixed with a connecting frame 31, which is installed inside the slot 21 by means of tenon and mortise connection.

[0036] The connecting frame 31 has an internal cavity, and an auxiliary positioning component 4 is installed inside the cavity;

[0037] The auxiliary positioning component 4 consists of a plug-in part and an adjustment part. The plug-in part includes a plug plate 42. The adjustment part can drive the plug plate 42 to move radially along the wheel seat 2 so that the plug plate 42 is inserted into the groove 22.

[0038] It should be noted that: in this device, there is a slot 21 on the outer circumference of the wheel seat 2, and a groove 22 is also provided at the bottom of the slot 21; at the same time, there is a connecting frame 31 at the root of the blade 3, which can be inserted into the slot 21 to realize the initial installation of the blade 3;

[0039] The connecting frame 31 has a cavity inside, which can be used as the installation space for the auxiliary positioning component 4. The auxiliary positioning component 4 consists of an adjustment part and a plug-in part, with the plug plate 42 in the plug-in part serving as the main positioning structure. The plug plate 42 can be plugged into the groove 22 to further reinforce the blade 3 and the wheel seat 2, giving the blade 3 higher stability.

[0040] The position of the insert plate 42 can be adjusted by using the adjustment part, so that the insert plate 42 can be inserted into or detached from the groove 22, which facilitates the disassembly and assembly of the blade 3.

[0041] In the embodiments of this utility model, please refer to Figure 6 The insertion part also includes a positioning frame 41, which is welded and fixed to the insertion plate 42. A positioning rod 43 is slidably connected through the positioning frame 41. One end of the positioning rod 43 is fixed inside the connecting frame 31. A spring 44 is also sleeved on the positioning rod 43 to press against the positioning frame 41 and the inner wall of the connecting frame 31.

[0042] Meanwhile, the connecting frame 31 is also provided with a through opening 32, and the insert plate 42 can be inserted through the through opening 32 to the outside of the connecting frame 31. The insert plate 42 and the groove 22 are adapted to each other in the form of a boss.

[0043] It should be noted that: for the insertion part, its positioning frame 41 is installed inside the connecting frame 31 through the positioning rod 43, and the two are slidably connected. The positioning frame 41 is the mounting base of the insertion plate 42, so it can drive the insertion plate 42 to move together. There is also a spring 44 on the positioning rod 43. Under normal conditions, the elastic force of the spring 44 can cause the positioning frame 41 to drive the insertion plate 42 to move towards the inside of the connecting frame 31, so that the insertion plate 42 is disengaged from the groove 22, thereby allowing the blade 3 and the wheel seat 2 to be disassembled and assembled.

[0044] In the embodiments of this utility model, please refer to Figure 7 The adjustment part includes two extrusion seats 45, which are slidably connected to the inside of the connecting frame 31. A left-right adjustment screw 47 is also rotatably connected inside the connecting frame 31. The left-right adjustment screw 47 is threadedly connected to both extrusion seats 45, which can drive the two extrusion seats 45 to move symmetrically. The extrusion seat 45 has an inclined surface, which can contact the positioning frame 41 and extrude pressure on it. One end of the left-right adjustment screw 47 is welded and fixed with an internal hexagonal end 48.

[0045] The inner wall of the connecting frame 31 also has a linear slide rail 33, while the side wall of the extrusion seat 45 has a linear slide groove 46, with the linear slide rail 33 embedded inside the linear slide groove 46.

[0046] It should be noted that in the adjustment section, the internal hexagonal end 48 can be rotated by tools such as a hex wrench, which in turn drives the left and right rotating adjustment screw 47 to rotate. The left and right rotating adjustment screw 47 is threadedly connected to the pressing seat 45, thereby driving the pressing seat 45 to move. During the slow movement of the pressing seat 45, it first contacts the positioning frame 41 and then applies pressure to it, thereby causing the positioning frame 41 to move against the elastic force of the spring 44, so that the insert plate 42 can be inserted into the groove 22.

[0047] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0048] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A turbine blade root anti-loosening structure, comprising a main shaft (1), a wheel seat (2) mounted on the main shaft (1), and blades (3) detachably connected to the outer circumference of the wheel seat (2), characterized in that: The outer circumferential wall of the wheel seat (2) has an axially arranged slot (21), and the bottom of the slot (21) also has a radially arranged groove (22). One end of the blade (3) is welded and fixed with a connecting frame (31), and the connecting frame (31) is installed inside the slot (21) by means of tenon and mortise connection; The connecting frame (31) has a cavity inside, and an auxiliary positioning component (4) is provided inside the cavity. The auxiliary positioning component (4) consists of a plug-in part and an adjustment part. The plug-in part includes a plug plate (42). The adjustment part can drive the plug plate (42) to move radially along the wheel seat (2) so that the plug plate (42) is inserted into the groove (22).

2. The turbine blade root anti-loosening structure according to claim 1, characterized in that, The insertion part also includes a positioning frame (41), which is welded and fixed to the insertion plate (42). A positioning rod (43) is slidably connected through the positioning frame (41). One end of the positioning rod (43) is fixed inside the connecting frame (31). A spring (44) is also sleeved on the positioning rod (43) to press against the inner wall of the positioning frame (41) and the connecting frame (31).

3. The turbine blade root anti-loosening structure according to claim 2, characterized in that, The connecting frame (31) is also provided with a through opening (32), and the insert plate (42) can be installed through the through opening (32) to the outside of the connecting frame (31).

4. The anti-loosening structure at the root of the steam turbine blade according to claim 3, characterized in that, The insert plate (42) and the groove (22) are fitted bosses.

5. The anti-loosening structure at the root of the turbine blade according to claim 1, characterized in that, The adjustment unit includes two extrusion seats (45), which are slidably connected to the inside of the connecting frame (31). A left-right adjustment screw (47) is also rotatably connected inside the connecting frame (31). The left-right adjustment screw (47) is threadedly connected to both extrusion seats (45) and can drive the two extrusion seats (45) to move symmetrically. The extrusion seat (45) has an inclined surface that can contact the positioning frame (41) and extrude pressure on it. One end of the left-right adjustment screw (47) is welded and fixed with an internal hexagonal end (48).

6. The anti-loosening structure at the root of the steam turbine blade according to claim 5, characterized in that, The inner wall of the connecting frame (31) also has a linear slide rail (33), and the side wall of the extrusion seat (45) has a linear groove (46), the linear slide rail (33) being embedded inside the linear groove (46).

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