Split mounting type steam turbine guide vane

Abstract

A slot is arranged on the upper surface of a blade root, one side of the blade is a thin edge, the other side of the blade is a thick edge, the shape of the cross section of the blade is consistent with that of the cross section of the slot, and the lower portion of the blade is inserted into the slot and is fixedly connected with the slot through a first bolt and a second bolt. The bottom of the blade is mutually inserted into the slot of the blade root, a first inclined screw hole, a second inclined screw hole, a first positioning extension hole and a second positioning extension hole are formed in two sides of the slot of the blade root, the first positioning extension hole and the second positioning extension hole correspond to the screw holes, a first through hole and a second through hole are formed in the lower part of the blade, and the blade is fixedly connected with the blade root through a first bolt and a second bolt. According to the detachable guide vane structure, when the vanes deform in the using process and the installing process or are damaged during machining, the vanes do not need to be replaced together with the vane roots, similarly, when the vane roots have the problems of size deviation and the like, the vanes do not need to be replaced together with the vane roots, and therefore cost is saved, and flexibility is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine guide vane technology, specifically a modular steam turbine guide vane. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto blades, causing a rotor equipped with rows of blades to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems.

[0003] The structure of turbine guide vanes generally includes a blade root and blades. Currently, the blade root and blades are mostly integrated structures. However, the blades are easily damaged during the processing or installation of the guide vanes. When the blades are damaged, the blade root must be scrapped along with the blades. Similarly, when there are processing problems with the blade root dimensions, the blades must also be replaced, leading to increased costs. Therefore, there is an urgent need for an improved technology to solve this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a modular steam turbine guide vane to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an assembled steam turbine guide vane, comprising a blade root, blades, a first bolt, and a second bolt;

[0006] The upper surface of the blade root is provided with a slot, and the two ends of the blade root are respectively provided with a first oblique screw hole and a second oblique screw hole. The first oblique screw hole and the second oblique screw hole are respectively connected to the corresponding positions on both sides of the slot. The blade root is provided with a first positioning extension hole on the side of the slot away from the first oblique screw hole. The first positioning extension hole and the first oblique screw hole are located on the same axis. The blade root is provided with a second positioning extension hole on the side of the slot away from the second oblique screw hole. The second positioning extension hole and the second oblique screw hole are located on the same axis.

[0007] The blade has a thin edge on one side and a thick edge on the other side. The shape of the blade's cross-section is consistent with the cross-section of the slot. The lower part of the blade is inserted into the slot. A first through hole is opened on the lower part of the blade near the thin edge, and a second through hole is opened on the lower part of the blade near the thick edge.

[0008] Both the first bolt and the second bolt have smooth front ends. The first bolt mates with the first oblique screw hole. The smooth surface of the first bolt passes through the first through hole of the blade and is inserted into the first positioning extension hole at the blade root. The second bolt mates with the second oblique screw hole. The smooth surface of the second bolt passes through the second through hole of the blade and is inserted into the second positioning extension hole at the blade root.

[0009] Preferably, the present invention provides an assembled steam turbine guide vane, wherein slots are provided on both sides of the blade root.

[0010] Preferably, the present invention provides an assembled steam turbine guide vane, wherein a fixing hole is provided on the lower surface of the blade root.

[0011] Preferably, in the assembled steam turbine guide vane provided by this utility model, the outer ends of the first oblique screw hole and the second oblique screw hole are provided with flared openings.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The blade root has a slot, and the bottom of the blade is inserted into the slot. The blade root has a first oblique screw hole, a second oblique screw hole, and a first positioning extension hole and a second positioning extension hole corresponding to the screw holes on both sides of the slot. The blade has a first through hole and a second through hole at the bottom. The blade is fastened to the blade root by the first bolt and the second bolt. The detachable guide vane structure means that if the blade is deformed or damaged during use or installation, it is not necessary to replace the blade root as well. Similarly, if the blade root has dimensional deviations, it is not necessary to replace the blade as well, thus saving costs and greatly improving flexibility. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 For the appendix Figure 1 Schematic diagram of the angle transformation structure;

[0016] Figure 3 This is a top view of the structure of this utility model;

[0017] Figure 4 This is a top-view sectional view of the leaf root structure.

[0018] Figure 5 This is a cross-sectional view of the leaf root structure from the front.

[0019] Figure 6 This is a schematic diagram of the blade structure.

[0020] In the figure: leaf root 1, blade 2, first bolt 3, second bolt 4, slot 5, first oblique screw hole 6, second oblique screw hole 7, first positioning extension hole 8, second positioning extension hole 9, first through hole 10, second through hole 11, slot 12, fixing hole 13, flared opening 14, thin edge 201, thick edge 202. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Please see Figure 1-6 This utility model provides a technical solution: an assembled steam turbine guide vane, including a blade root 1, a blade 2, a first bolt 3 and a second bolt 4;

[0024] A slot 5 is provided on the upper surface of the blade root 1. A first oblique screw hole 6 and a second oblique screw hole 7 are respectively provided at both ends of the blade root 1. The first oblique screw hole 6 and the second oblique screw hole 7 are respectively connected to the corresponding positions on both sides of the slot 5. The outer ends of the first oblique screw hole 6 and the second oblique screw hole 7 are provided with flared openings 14 so that the heads of the first bolt 3 and the second bolt 4 can be hidden in the flared openings 14. A first positioning extension hole 8 is provided on the side of the blade root 1 away from the first oblique screw hole 6 in the slot 5. The first positioning extension hole 8 and the first oblique screw hole 6 are located on the same axis to ensure that the first bolt 3 can pass smoothly through the first oblique screw hole 6. Hole 6 and first positioning extension hole 8, blade root 1 is provided with second positioning extension hole 9 on the side of slot 5 away from second oblique screw hole 7. The second positioning extension hole 9 and the second oblique screw hole 7 are located on the same axis to ensure that the second bolt 4 can pass smoothly through the second oblique screw hole 7 and the second positioning extension hole 9. The blade root 1 is provided with slots 12 on both sides to achieve snap-fit ​​with the turbine guide vane mounting seat to ensure the stability of the guide vane when the turbine is working. The lower surface of the blade root 1 is provided with fixing hole 13. The fixing hole 13 is a threaded hole, and the fixing hole 13 is used to achieve fast connection with the turbine guide vane mounting seat by bolt.

[0025] One side of the blade 2 is a thin edge 201, and the other side of the blade 2 is a thick edge 202. The shape of the cross section of the blade 2 is consistent with the cross section of the slot 5. The lower part of the blade 2 is inserted into the slot 5. A first through hole 10 is opened on the lower part of the blade 2 and near the thin edge 201, and a second through hole 11 is opened on the lower part of the blade 2 and near the thick edge 202.

[0026] Both the front ends of the first bolt 3 and the second bolt 4 have smooth surfaces. The first bolt 3 is engaged with the first oblique screw hole 6. The smooth surface of the first bolt 3 passes through the first through hole 10 of the blade 2 and is inserted into the first positioning extension hole 8 of the blade root 1. The second bolt 4 is engaged with the second oblique screw hole 7. The smooth surface of the second bolt 4 passes through the second through hole 11 of the blade 2 and is inserted into the second positioning extension hole 9 of the blade root 1.

[0027] Usage and Principle: First, prepare blade root 1 blanks and blade 2 blanks. Then, machine blade root 1 and blade 2 separately using a machining center. Next, open a first oblique screw hole 6 and a second oblique screw hole 7 on both sides of the slot 5 of blade root 1. Then, open a first positioning extension hole 8 and a second positioning extension hole 9. Finally, open a first through hole 10 and a second through hole 11 at the bottom of blade 2, completing the machining of blade root 1 and blade 2. During assembly, insert the bottom of blade 2 into the slot 5 of blade root 1. Pass the smooth surface of the front end of the first bolt 3 through the first oblique screw hole 6 and the first through hole 10, and insert it into the first positioning extension hole 8. Pass the smooth surface of the front end of the second bolt 4 through the second oblique screw hole 7 and the second through hole 11, and insert it into the second positioning extension hole 9. At this point, blade 2 is securely connected to blade root 1 by the first bolt 3 and the second bolt 4. In use, connect blade root 1 to the turbine mounting ring to complete the installation. This utility model has a reasonable structure. The blade root 1 has a slot 5, and the bottom of the blade 2 is inserted into the slot 5. The blade root 1 has a first oblique screw hole 6, a second oblique screw hole 7, and a first positioning extension hole 8 and a second positioning extension hole 9 corresponding to the screw holes on both sides of the slot 5. The blade 2 has a first through hole 10 and a second through hole 11 at the bottom. The blade 2 is fastened to the blade root 1 by the first bolt 3 and the second bolt 4. It is a detachable guide vane structure. When the blade 2 is deformed or damaged during use or installation, it is not necessary to replace the blade root 1 as well. Similarly, when the blade root 1 has problems such as dimensional deviation, it is not necessary to replace the blade 2 as well, thereby saving costs and greatly improving flexibility.

[0028] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0029] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A modular steam turbine guide vane, characterized in that: Includes leaf root (1), blade (2), first bolt (3) and second bolt (4); The upper surface of the leaf root (1) is provided with a slot (5), and the two ends of the leaf root (1) are respectively provided with a first oblique screw hole (6) and a second oblique screw hole (7). The first oblique screw hole (6) and the second oblique screw hole (7) are respectively connected to the corresponding positions on both sides of the slot (5). The leaf root (1) is provided with a first positioning extension hole (8) on the side of the slot (5) away from the first oblique screw hole (6). The first positioning extension hole (8) and the first oblique screw hole (6) are located on the same axis. The leaf root (1) is provided with a second positioning extension hole (9) on the side of the slot (5) away from the second oblique screw hole (7). The second positioning extension hole (9) and the second oblique screw hole (7) are located on the same axis. The blade (2) has a thin edge (201) on one side and a thick edge (202) on the other side. The shape of the cross section of the blade (2) is consistent with the cross section of the slot (5). The lower part of the blade (2) is inserted into the slot (5). A first through hole (10) is opened on the lower part of the blade (2) near the thin edge (201), and a second through hole (11) is opened on the lower part of the blade (2) near the thick edge (202). The front ends of the first bolt (3) and the second bolt (4) are both smooth surfaces. The first bolt (3) is engaged with the first oblique screw hole (6). The smooth surface of the first bolt (3) passes through the first through hole (10) of the blade (2) and is inserted into the first positioning extension hole (8) of the blade root (1). The second bolt (4) is engaged with the second oblique screw hole (7). The smooth surface of the second bolt (4) passes through the second through hole (11) of the blade (2) and is inserted into the second positioning extension hole (9) of the blade root (1).

2. The assembled steam turbine guide vane according to claim 1, characterized in that: The leaf root (1) has slots (12) on both sides.

3. The assembled steam turbine guide vane according to claim 1, characterized in that: A fixing hole (13) is provided on the lower surface of the leaf root (1).

4. The assembled steam turbine guide vane according to claim 1, characterized in that: Both the first oblique screw hole (6) and the second oblique screw hole (7) have flared openings (14) at their outer ends.

Images