Conveniently spliced long moving blade of steam turbine

Abstract

The utility model discloses a steam turbine long moving blade convenient to splice, including blade body, blade root and blade top, the bottom of blade body is provided with the blade root, and the top of blade body is provided with the blade top, and one end of blade top is provided with the positioning protruding, and the other end of blade top is provided with the positioning groove, and blade body is provided with the thickening area, and the one side of thickening area of blade body is provided with the positioning sleeve, and the other side of thickening area of blade body is provided with the positioning rod, and the positioning rod and positioning sleeve are located same axis, and the axis of positioning rod and the connecting line between the positioning protruding and positioning groove of blade top are mutually parallel, the utility model discloses reasonable structure, and the thickening area is provided to blade body, and the positioning sleeve and positioning rod are coaxially arranged on the inside and outside of thickening area of blade body, when two long moving blades splice, directly through the insertion of positioning rod and positioning sleeve to guarantee the structural strength of long moving blade middle position, compared with the structure of traditional additional bar, convenient splice, need not to process bar alone again, and the structural strength and stability are higher.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine blade technology, specifically a long moving blade for steam turbines that is easy to assemble. Background Technology

[0002] Long moving blades are the longest blades in a steam turbine, operating under the harshest conditions and requiring the highest design and manufacturing technical barriers. They are typically located in the low-pressure last stage of the steam turbine. To ensure the structural strength of the middle section of the blade, existing long moving blades generally use tie rods that pass through the blade body. However, this type of long moving blade requires holes in the blade body to allow the tie rods to pass through. This increases the difficulty of installing and assembling long moving blades and requires additional processing of tie rods, increasing equipment investment and time costs. Therefore, there is an urgent need for an improved technology to solve this problem in the existing technology. Summary of the Invention

[0003] The purpose of this invention is to provide a steam turbine long moving blade that is easy to assemble, eliminates the need for separate bracing, and has higher structural strength and stability, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a long moving blade for a steam turbine that is easy to assemble, comprising a blade body, a blade root, and a blade tip. The blade body has a blade root at its bottom end and a blade tip at its top end. One end of the blade tip has a positioning protrusion, and the other end of the blade tip has a positioning groove. The blade body has a thickened area. A positioning sleeve is provided on one side of the thickened area, and a positioning rod is provided on the other side of the thickened area. The positioning rod and the positioning sleeve are located on the same axis, and the axis of the positioning rod is parallel to the line connecting the positioning protrusion and the positioning groove on the blade tip.

[0005] Preferably, the present invention provides a steam turbine long moving blade that is easy to assemble, wherein the shape of the positioning protrusion matches that of the positioning groove.

[0006] Preferably, the present invention provides a steam turbine long moving blade that is easy to assemble, wherein the outer end of the positioning rod is chamfered, and the outer diameter of the positioning rod is consistent with the inner diameter of the positioning sleeve.

[0007] Preferably, the present invention provides a steam turbine long moving blade that is easy to splice, wherein the blade body is a twisted arc-shaped structure.

[0008] Preferably, the present invention provides a steam turbine long moving blade that is easy to assemble, wherein the blade root is provided with several slots.

[0009] Compared with the prior art, the beneficial effects of this utility model are: The blade has a thickened area, and positioning sleeves and positioning rods are coaxially installed on both sides of the thickened area. When two long moving blades are spliced, they are directly connected by the positioning rods and positioning sleeves to ensure the structural strength of the middle position of the long moving blades. Compared with the traditional structure with additional bracing, it is easier to splice, does not require separate processing of bracing, and has higher structural strength and stability. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 For the appendix Figure 1 A schematic diagram of the angle transformation structure.

[0011] In the diagram: 1. Leaf body; 2. Leaf root; 3. Leaf tip; 4. Positioning protrusion; 5. Positioning groove; 6. Thickened area; 7. Positioning sleeve; 8. Positioning rod; 9. Slot. Detailed Implementation

[0012] 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. 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.

[0013] Please see Figure 1-2This utility model provides a technical solution: a long moving blade for a steam turbine that is easy to splice, including a blade body 1, a blade root 2, and a blade tip 3. The blade body 1 has a twisted arc-shaped structure to form a flow channel between two long moving blades. The blade root 2 is provided at the bottom of the blade body 1, and the blade root 2 is provided with several slots 9 to facilitate insertion with the corresponding installation position of the steam turbine. The blade tip 3 is provided at the top of the blade body 1. One end of the blade tip 3 is provided with a positioning protrusion 4, and the other end of the blade tip 3 is provided with a positioning groove 5. The shapes of the positioning protrusion 4 and the positioning groove 5 are matched. When two long moving blades are spliced, the splicing of the positioning protrusion 4 and the positioning groove 5 ensures that the blade... To ensure the stability of the connection between the top 3 blades, the blade body 1 is provided with a thickened area 6. A positioning sleeve 7 is provided on one side of the thickened area 6, and a positioning rod 8 is provided on the other side of the thickened area 6. The positioning rod 8 and the positioning sleeve 7 are located on the same axis. The outer end of the positioning rod 8 is chamfered so that the positioning rod 8 of one long moving blade can be smoothly inserted into the positioning sleeve 7 of another long moving blade. The outer diameter of the positioning rod 8 is the same as the inner diameter of the positioning sleeve 7 to ensure the stability of the insertion point of the positioning rod 8 and the positioning sleeve 7 when the two long moving blades are spliced ​​together. The axis of the positioning rod 8 is parallel to the line connecting the positioning protrusion 4 and the positioning groove 5 of the blade top 3.

[0014] Installation Method and Operating Principle: First, a blank is prepared. Then, a long moving blade is machined using a machining center. This long moving blade has a pre-reserved thickened area 6, with a positioning sleeve 7 pre-reserved on the inner side and a positioning rod 8 pre-reserved on the outer side. The positioning sleeve 7 is then drilled, and the outer end of the positioning rod 8 is chamfered, completing the machining of the long moving blade. During installation, the blade roots 2 of two long moving blades are connected and inserted into the corresponding inner ring of the turbine through the slot 9. At this time, the positioning rod 8 of one long moving blade is inserted into the positioning sleeve 7 of the other long moving blade, and the positioning protrusion 4 of the blade tip 3 of one long moving blade is inserted into the positioning groove 5 of the blade tip 3 of the other long moving blade, completing the assembly of two long moving blades. This process is repeated until all long moving blades are installed. When installing the last few long moving blades, the positioning rod 8 needs to be pre-aligned with the positioning sleeve 7 before being installed downwards together, ensuring that the positioning rod 8 can be smoothly inserted into the positioning sleeve 7 of the adjacent long moving blade. During operation, the positioning rod 8 abuts against the inner end of the positioning sleeve 7, ensuring that the long blades do not loosen. This utility model has a reasonable structure. The blade body 1 is provided with a thickened area 6. The positioning sleeve 7 and positioning rod 8 are coaxially arranged on both sides of the thickened area 6 on the blade body 1. When two long moving blades are spliced, they are directly connected by the positioning rod 8 and the positioning sleeve 7 to ensure the structural strength of the middle position of the long moving blades. Compared with the traditional structure with additional tie rods, it is convenient to splice, does not require separate processing of tie rods, and has higher structural strength and stability.

[0015] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0016] 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 type of long moving blade for steam turbines that is easy to assemble, characterized in that: The blade includes a leaf body (1), a leaf root (2), and a leaf tip (3). The leaf root (2) is provided at the bottom of the leaf body (1), and the leaf tip (3) is provided at the top of the leaf body (1). A positioning protrusion (4) is provided at one end of the leaf tip (3), and a positioning groove (5) is provided at the other end of the leaf tip (3). The leaf body (1) has a thickened area (6). A positioning sleeve (7) is provided on one side of the thickened area (6) of the leaf body (1), and a positioning rod (8) is provided on the other side of the thickened area (6) of the leaf body (1). The positioning rod (8) and the positioning sleeve (7) are located on the same axis. The axis of the positioning rod (8) is parallel to the line connecting the positioning protrusion (4) and the positioning groove (5) of the leaf tip (3).

2. The steam turbine long moving blade that is easy to assemble according to claim 1, characterized in that: The positioning protrusion (4) and the positioning groove (5) are matched in shape.

3. The steam turbine long moving blade that is easy to assemble according to claim 1, characterized in that: The outer end of the positioning rod (8) is chamfered, and the outer diameter of the positioning rod (8) is the same as the inner diameter of the positioning sleeve (7).

4. The steam turbine long moving blade that is easy to assemble according to claim 1, characterized in that: The blade (1) has a twisted arc-shaped structure.

5. A steam turbine long moving blade that is easy to assemble according to claim 1, characterized in that: The leaf root (2) is provided with several slots (9).

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