First-stage moving blade for steam turbine

Abstract

A blade root is arranged at the bottom of a blade body, a groove is formed in the end, away from the blade body, of the blade root, and an internal thread sleeve, inclined reinforcing ribs and straight reinforcing ribs are arranged in the groove. The inner ends of the inclined reinforcing ribs and the inner ends of the straight reinforcing ribs are connected with the outer wall of the inner threaded sleeve and extend outwards in the radial direction of the inner threaded sleeve, the outer ends of the inclined reinforcing ribs are connected with the corners of the grooves, and the outer ends of the straight reinforcing ribs are perpendicularly connected with the corresponding side edges. And meanwhile, the inclined reinforcing ribs and the straight reinforcing ribs are arranged in the grooves, so that the material consumption is reduced, and the structural strength of the grooves and the structural strength and supporting performance of the internal thread sleeve are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine moving blade technical field, concretely is a first stage moving blade for steam turbine. BACKGROUND

[0002] Steam turbine is also called steam turbine engine, and it is a kind of rotary steam power device, high-temperature and high-pressure steam is injected to blade after becoming accelerated airflow through fixed nozzle, and the rotating rotor with blade row is rotated, and external work is done simultaneously.Steam turbine is the main equipment of modern thermal power plant, and it is also used in metallurgical industry, chemical industry and ship power device.

[0003] Generally, a plurality of moving blades and stationary blades are arranged in steam turbine, and the moving blades are divided into short moving blades, medium-long moving blades and long moving blades, wherein the short moving blades are generally used as first stage moving blades, and the first stage moving blades are generally solid in the blade root and are provided with screw holes, but the solid structure leads to cost increase, therefore, an improved technology is urgently needed to solve the problem existing in the prior art. UTILITY MODEL CONTENT

[0004] The utility model discloses a first stage moving blade for steam turbine, by setting recess in the blade root, the use amount of material is reduced, thereby reducing production cost, and the recess is provided with inclined reinforcing ribs and straight reinforcing ribs, the structure strength of recess, the structure strength and supportability of internal thread sleeve are ensured while reducing the use amount of material, so as to solve the problem in the background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a first stage moving blade for steam turbine, including blade root and blade body, the bottom of blade body is provided with blade root, the recess is set in the blade root away from blade body one end, the cross section of blade root and the cross section of recess are parallelogram, the recess in blade root and located at the central position are provided with internal thread sleeve, the recess is also provided with a plurality of inclined reinforcing ribs and straight reinforcing ribs, the inner end of inclined reinforcing rib and straight reinforcing rib is connected with internal thread sleeve, the outer end of inclined reinforcing rib is connected with the corresponding corner of recess, and the outer end of straight reinforcing rib is connected with the corresponding side of recess perpendicularly.

[0006] Preferably, the utility model provides a first stage moving blade for steam turbine, wherein, the blade root, blade body, internal thread sleeve, inclined reinforcing rib and straight reinforcing rib are integrated structure.

[0007] Preferably, the utility model provides a first stage moving blade for steam turbine, wherein, the inclined reinforcing rib and straight reinforcing rib are arranged along the radial direction of internal thread sleeve.

[0008] Preferably, the utility model provides a first stage moving blade for steam turbine, wherein the inclined reinforcing rib and straight reinforcing rib bottom are flush with the bottom of blade root.

[0009] Preferably, the utility model provides a first stage moving blade for steam turbine, wherein the blade root is equipped with a plurality of positioning clamping slots on both sides.

[0010] Preferably, the utility model provides a first stage moving blade for steam turbine, wherein the blade body adopts the twisted blade structure with the axis as the center line and the curved two sides.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The recess is arranged at the end of the blade root away from the blade body, the recess is internally provided with an internally threaded sleeve, an inclined reinforcing rib and a straight reinforcing rib, the inclined reinforcing rib and the straight reinforcing rib are connected with the outer wall of the internally threaded sleeve at the inner end and extend outward along the radial direction of the internally threaded sleeve, the outer end of the inclined reinforcing rib is connected with the corner of the recess, and the outer end of the straight reinforcing rib is perpendicularly connected with the corresponding side edge, the recess is arranged in the blade root to reduce the use amount of material, thereby reducing the production cost, and the inclined reinforcing rib and the straight reinforcing rib are arranged in the recess to ensure the structural strength and supporting property of the recess and the internally threaded sleeve while reducing the use amount of material. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the utility model;

[0014] Figure 2 It is a bottom view structural schematic view of the utility model;

[0015] Figure 3 It is a top view structural schematic view of the utility model;

[0016] Figure 4 It is a sectional view structural schematic view of the utility model.

[0017] In the drawing: blade root 1, blade body 2, recess 3, internally threaded sleeve 4, inclined reinforcing rib 5, straight reinforcing rib 6, positioning clamping slot 7. DETAILED DESCRIPTION

[0018] The technical scheme of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model;

[0019] It should be noted that in the description of the utility model, it should be noted that the terms "inner", "outer", "upper", "lower", "two sides", "one end", "the other end", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0020] Please refer to Figures 1-4 The utility model provides a kind of first-stage blade for steam turbine, including blade root 1 and blade body 2, the bottom of blade body 2 is provided with blade root 1, blade root 1 is provided with several positioning clamping groove 7 on both sides, to realize and the installation groove of impeller or rotary drum are mutually clamped, blade body 2 is adopted with axis as center line both sides are curved twisted blade structure, to realize the flow of steam, blade root 1 is provided with recess 3 away from one end of blade body 2, the cross section of blade root 1 and the cross section of recess 3 are parallelogram, recess 3 in blade root 1 and located in central position are provided with internal thread sleeve 4, recess 3 is further provided with several inclined reinforcing rib 5 and straight reinforcing rib 6, the inner end of inclined reinforcing rib 5 and straight reinforcing rib 6 is connected with internal thread sleeve 4, the outer end of inclined reinforcing rib 5 is connected with the corresponding corner of recess 3, the outer end of straight reinforcing rib 6 is connected with the corresponding side of recess 3, blade root 1, blade body 2, internal thread sleeve 4, inclined reinforcing rib 5 and straight reinforcing rib 6 are integrated structure, adopt integrated forming process, guarantee the structural strength of whole, inclined reinforcing rib 5 and straight reinforcing rib 6 are set along the radial direction of internal thread sleeve 4, to guarantee the support force of inclined reinforcing rib 5 and straight reinforcing rib 6 to internal thread sleeve 4 from each direction, the bottom of inclined reinforcing rib 5 and straight reinforcing rib 6 is flush with the bottom of blade root 1, to guarantee that the bottom of blade root 1 can be mutually fitted with the installation groove of impeller or rotary drum, to guarantee the stability of blade.

[0021] Processing method and use principle: first, the blade blank is prepared, the bottom of the blank is reserved groove 3, and the groove 3 is reserved inclined reinforcing rib 5, straight reinforcing rib 6 and a solid column, then the solid column is threaded to obtain the internal thread sleeve 4 through the tapping equipment, then the clamping groove is opened on both sides of the blade root 1 through the machining center, and the blade body 2 is processed and the curved twisted blade is obtained, the processing is completed. When used, the blade root 1 is inserted and connected with the mounting groove of the impeller or the rotating drum, and the bolt is passed through the inner wall of the impeller or the rotating drum and is tightly connected with the internal thread sleeve 4 in the blade root 1, and the installation is completed. The utility model discloses a reasonable structure, the blade root 1 is provided with groove 3 away from the blade body 2 end, the groove 3 is internally provided with internal thread sleeve 4, inclined reinforcing rib 5 and straight reinforcing rib 6, the inclined reinforcing rib 5 and the straight reinforcing rib 6 are connected with the outer wall of the internal thread sleeve 4 and extend outward along the radial direction of the internal thread sleeve 4, the outer end of the inclined reinforcing rib 5 is connected with the corner of the groove 3, and the outer end of the straight reinforcing rib 6 is perpendicularly connected with the corresponding side edge, the groove 3 is opened in the blade root 1, so that the use amount of material is reduced, and the production cost is reduced, and the groove 3 is provided with inclined reinforcing rib 5 and straight reinforcing rib 6, so that the structural strength of the groove 3 and the structural strength and supportability of the internal thread sleeve 4 are ensured while the material usage is reduced.

[0022] The parts not described in the utility model are the known technology of those skilled in the art.

[0023] Finally, it should be pointed out that: the above specific embodiments are only used to illustrate the technical scheme of the utility model and are not limited, although the utility model is described in detail with reference to the embodiments, those skilled in the art should understand that the technical scheme of the utility model can be modified and replaced, without departing from the spirit and scope of the technical scheme of the utility model, which should be covered in the claim range of the utility model.

Claims

1. A first stage rotor blade for a steam turbine, characterized by: The utility model provides a blade root (1) and blade body (2), the bottom of blade body (2) is provided with blade root (1), the recess (3) is seted up in the end of blade root (1) away from blade body (2), the cross section of blade root (1) and the cross section of recess (3) are parallelogram, the recess (3) in blade root (1) and the central position are provided with internally threaded sleeve (4), the recess (3) inside is also provided with several inclined reinforcing ribs (5) and straight reinforcing rib (6), the inner end of inclined reinforcing rib (5) and straight reinforcing rib (6) is connected with internally threaded sleeve (4), the outer end of inclined reinforcing rib (5) is connected with the corner of recess (3) corresponding, the outer end of straight reinforcing rib (6) is connected with the side of recess (3) corresponding vertically.

2. A first stage rotor blade for a steam turbine as defined in claim 1, characterized in that: The blade root (1), the blade body (2), the internally threaded sleeve (4), the inclined reinforcing rib (5) and the straight reinforcing rib (6) are an integral structure.

3. A first stage rotor blade for a steam turbine as defined in claim 1, characterized in that: The inclined reinforcing rib (5) and the straight reinforcing rib (6) are arranged along the radial direction of the internally threaded sleeve (4).

4. A first stage rotor blade for a steam turbine as defined in claim 1, wherein: The bottom of the inclined reinforcing rib (5) and the straight reinforcing rib (6) is flush with the bottom of the blade root (1).

5. A first stage rotor blade for a steam turbine as defined in claim 1, wherein: The blade root (1) is provided with a plurality of positioning clamping grooves (7) on both sides.

6. A first stage rotor blade for a steam turbine as defined in claim 1, wherein: The blade body (2) adopts a twisted blade structure with the axis as the center line and the two sides curved.

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