Whole-circle blade

Abstract

The utility model relates to the technical field of whole-circle blade assembly, and discloses a whole-circle blade. The whole-circle blade comprises a whole-circle blade body, a plurality of first half locking blocks and a plurality of second half locking blocks, the whole-circle blade body comprises a plurality of blade single bodies, and an annular dovetail groove is formed by the peripheries of the blade single bodies which are annularly arranged; the multiple first half locking blocks are connected end to end in the circumferential direction of the dovetail groove and are arranged in the whole-circle arrangement side, and the joints of the blade single bodies and the joints of the first half locking blocks are staggered; the multiple second half locking blocks are arranged in the staggered arrangement side in the circumferential direction of the dovetail groove, a gap is formed between at least part of every two adjacent second half locking blocks, the multiple gaps are provided with limiting pieces respectively, and the joints of the blade single bodies and the joints of the second half locking blocks are staggered. Based on the whole-circle blade provided by the utility model, the plurality of blade monomers are sequentially clung to one another, so that the integrity and the vibration resistance of the whole-circle blade can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of integral blade assembly, and particularly relates to an integral blade. Background Art

[0002] In the field of industrial drives, such as high-speed rotating machinery fields like power station steam turbines, gas turbines, and aero-engines, shroud rings are used to connect the blades of the same stage into a whole to increase their vibration resistance, and at the same time play the roles of radial sealing of the air passage and axial sealing of the blade row.

[0003] In the power station steam turbine industry, with the increasing demands for variable speed, large flow rate, high efficiency, etc., the importance of its safety design has been continuously highlighted. In the traditional integral assembly with self-shroud rings, in order to make room for the filling of locking blocks, a gap for one blade is reserved for the locking blocks to complete the filling action. After the locking blocks are filled, the last blade is then installed. This assembly method installs the last blade on the basis of the basic completion of the integral assembly. The disadvantage of this assembly structure is that the gap between the locking blocks is large, resulting in poor integrity of the connection of the whole stage of blades and poor vibration resistance effect. Summary of the Utility Model

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the utility model provides an integral blade.

[0005] The utility model provides an integral blade, including:

[0006] An integral blade body, including a plurality of blade monomers. The outer periphery of the plurality of annularly arranged blade monomers forms an annular dovetail groove, and the dovetail groove is divided into an integral arrangement side and a staggered arrangement side along its axial direction;

[0007] A plurality of first half locking blocks are arranged in the integral arrangement side along the circumferential direction of the dovetail groove and are connected end to end, and the joint of the blade monomers is staggered from the joint of the first half locking blocks;

[0008] A plurality of second half locking blocks are arranged in the staggered arrangement side along the circumferential direction of the dovetail groove. At least some adjacent two of the second half locking blocks form a gap, and a limiting member is provided in each of the plurality of gaps, and the joint of the blade monomers is staggered from the joint of the second half locking blocks.

[0009] Optionally, the inner circle width of the first half locking block and the second half locking block is smaller than the width of the top notch of the dovetail groove.

[0010] Optionally, the cross sections of the first half locking block and the second half locking block are both in the shape of a right trapezoid and are symmetrical along the axis of the dovetail groove.

[0011] Optionally, the linear length of the first half locking block and the second half locking block is L, and the linear length of the blade monomer is C, where,

[0012] Optionally, a plurality of the second half locking blocks are arranged at equal intervals so that the sizes of a plurality of the gaps are the same.

[0013] Optionally, the total length of a plurality of the gaps is the same as the length of a single second half locking block.

[0014] Optionally, the first half locking block and the second half locking block have the same length.

[0015] Optionally, the blade monomer includes a shroud and a plurality of blade bodies arranged inside the shroud.

[0016] Optionally, the limiting member is formed by protruding from the position of the shroud corresponding to the gap in the direction of the gap.

[0017] Optionally, a groove is provided on the outer periphery of each shroud, and a plurality of the grooves are connected end to end in sequence to form the dovetail groove.

[0018] The technical solution provided by the embodiment of the present utility model has the following advantages compared with the prior art:

[0019] Based on the full-circle blade provided by the present utility model, a plurality of blade monomers are assembled in a full circle and connected end to end. By inserting a plurality of first half locking blocks and a plurality of second half locking blocks into the full-circle arrangement side and the staggered arrangement side respectively to connect a plurality of blade monomers, the gaps on the staggered arrangement side are filled by inserting limiting members during the installation process to ensure the connection effect of a plurality of blade monomers. In this design method, a plurality of blade monomers of the full-circle blade are successively in close contact, which can improve the integrity and vibration resistance of the full-circle blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present utility model, and are used together with the specification to explain the principles of the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the full-circle blade according to the embodiment of the present utility model;

[0023] Figure 2 is Figure 1 a partial enlarged view of part A in

[0024] Figure 3 a sectional view showing the connection of the shroud with the first half locking block and the second half locking block according to the embodiment of the present invention;

[0025] Figure 4 a schematic structural view of the blade monomer according to the embodiment of the present invention;

[0026] Figure 5 a schematic structural view of the first half locking block according to the embodiment of the present invention.

[0027] Description of the reference numerals

[0028] 1, integral blade body; 2, blade monomer; 21, blade body; 22, shroud; 3, dovetail groove; 4, integrally arranged side; 5, staggeredly arranged side; 6, first half locking block; 7, second half locking block. Specific embodiments

[0029] In order to more clearly understand the above objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] Combined with Figures 1 to 5 as shown, the present invention provides an integral blade, which includes an integral blade body 1, a plurality of first half locking blocks 6 and a plurality of second half locking blocks 7.

[0032] The integral ring blade body 1 includes a plurality of blade monomers 2. The outer periphery of the plurality of annularly arranged blade monomers 2 forms an annular dovetail groove 3. The dovetail groove 3 is divided into an integral ring arrangement side 4 and a staggered arrangement side 5 along its axial direction. Specifically, the blade monomer 2 includes a shroud 22 and a plurality of blade bodies 21 arranged inside the shroud 22. Each shroud 22 is provided with a groove on its outer periphery, and the plurality of grooves are connected end to end in sequence to form the dovetail groove 3. A plurality of first half locking blocks 6 are arranged in the integral ring arrangement side 4 along the circumferential direction of the dovetail groove 3 and are connected end to end. The joint of the blade monomers 2 is staggered from the joint of the first half locking blocks 6, so that the first half locking blocks 6 can play a role in connecting two adjacent blade monomers 2. A plurality of second half locking blocks 7 are arranged in the staggered arrangement side 5 along the circumferential direction of the dovetail groove 3. At least some gaps are formed between two adjacent second half locking blocks 7 to provide space for the installation of the first half locking blocks 6. A plurality of gaps are respectively provided with limiting members to press against two adjacent second half locking blocks 7, and the joint of the blade monomers 2 is staggered from the joint of the second half locking blocks 7, so that the second half locking blocks 7 can play a role in connecting two adjacent blade monomers 2.

[0033] Based on the integral ring blade provided by the present utility model, a plurality of blade monomers 2 are integrally assembled and connected end to end. The plurality of blade monomers 2 are connected by inserting a plurality of first half locking blocks 6 and a plurality of second half locking blocks 7 into the integral ring arrangement side 4 and the staggered arrangement side 5 respectively. During the installation process, the gaps on the staggered arrangement side 5 are filled by inserting limiting members to ensure the connection effect of the plurality of blade monomers 2. In this design method, the plurality of blade monomers 2 of the integral ring blade are successively pressed against each other, which can improve the integrity and vibration resistance of the integral ring blade.

[0034] In some embodiments, the inner ring width of the first half locking block 6 and the second half locking block 7 is smaller than the width of the top notch of the dovetail groove 3.

[0035] In this design method, the first half locking block 6 and the second half locking block 7 can be inserted into the dovetail groove 3 through the top notch of the dovetail groove 3, and then can be installed into the corresponding integral ring arrangement side 4 and staggered arrangement side 5, increasing the convenience of assembly.

[0036] In some embodiments, the cross-sections of the first half locking block 6 and the second half locking block 7 are both right trapezoids and are symmetric along the axis of the dovetail groove 3.

[0037] Specifically, the cross-section of the dovetail groove 3 is an equilateral trapezoid (the lengths and inclinations of the two side edges of the cross-section of the dovetail groove 3 are the same). At this time, the cross-sectional shape of the first half locking block 6 is a right trapezoid, and the maximum length of the cross-section of the first half locking block 6 should be less than the length of the notch cross-section of the dovetail groove 3, so that the first half locking block 6 can be inserted into the dovetail groove 3 through the notch of the dovetail groove 3. The cross-sectional shape of the second half locking block 7 is also a right trapezoid, and the maximum length of the cross-section of the second half locking block 7 should be less than the length of the notch cross-section of the dovetail groove 3, so that the second half locking block 7 can be inserted into the dovetail groove 3 through the notch of the dovetail groove 3.

[0038] In this design, the dovetail grooves 3 are axially symmetrically distributed, and the first half locking blocks 6 and the second half locking blocks 7 are also symmetrically distributed. Moreover, the first half locking blocks 6, the second half locking blocks 7 and the limiting members can fill the dovetail grooves 3 to enhance the connection effect of the entire ring of blades, and the symmetric arrangement can increase the connection stability, making the forces at all positions of the entire ring of blades uniform.

[0039] In some embodiments, the cross-section of the dovetail groove 3 is a trapezoid (the lengths and inclinations of the two side edges of the cross-section of the dovetail groove 3 are different). At this time, the cross-sectional shape of the first half locking block 6 is a right trapezoid, and the maximum length of the cross-section of the first half locking block 6 should be less than the length of the notch cross-section of the dovetail groove 3, so that the first half locking block 6 can be inserted into the dovetail groove 3 through the notch of the dovetail groove 3. The cross-sectional shape of the second half locking block 7 is also a right trapezoid, and the maximum length of the cross-section of the second half locking block 7 should be less than the length of the notch cross-section of the dovetail groove 3, so that the second half locking block 7 can be inserted into the dovetail groove 3 through the notch of the dovetail groove 3. In addition, the length and inclination of the hypotenuse of the cross-section of the first half locking block 6 are different from those of the hypotenuse of the cross-section of the second half locking block 7.

[0040] It can be seen that the cross-section of the dovetail groove 3 is a trapezoid, and the specific inclination of its hypotenuse can be selected according to actual needs. Correspondingly, the length and inclination of the hypotenuse of the cross-section of the first half locking block 6 and the length and inclination of the hypotenuse of the cross-section of the second half locking block 7 are designed according to the shape of the dovetail groove 3 to ensure that the first half locking block 6 and the second half locking block 7 can fill the dovetail groove 3.

[0041] In some embodiments, the straight-line length of the first half locking block 6 and the second half locking block 7 is L, and the straight-line length of the blade unit 2 is C, where Preferably, the straight-line length of the first half locking block 6 and the second half locking block 7 is L, and the straight-line length of the blade unit 2 is C,

[0042] When the first half locking blocks 6 of this size are connected end to end, it can ensure that the joints between two adjacent first half locking blocks 6 are staggered from the joints between two adjacent blade monomers 2, thus ensuring the connection effect. Similarly, the second half locking blocks 7 of this size can be arranged at equal intervals (the gaps are filled by limit pieces), ensuring that the joints between two adjacent second half locking blocks 7 are staggered from the joints between two adjacent blade monomers 2, thus ensuring the connection effect.

[0043] In some embodiments, multiple second half locking blocks 7 are arranged at equal intervals so that the sizes of multiple gaps are the same.

[0044] Under this operation, the gap sizes between two adjacent second half locking blocks 7 can be made the same, and then caulking treatment is performed on multiple gaps with the same size, which increases the convenience of the operation. At the same time, it can ensure the uniformity and stability of the force on each second half locking block 7, and improve the integrity and vibration resistance of the entire circle of blades.

[0045] In some embodiments, the total length of multiple gaps is the same as the length of a single second half locking block 7. The first half locking block and the second half locking block have the same length. Under this design method, the assembly requirements of the first half locking block 6 and the second half locking block 7 can be met, and the assembly difficulty can be reduced.

[0046] In some embodiments, the sizes of multiple first half locking blocks 6 are the same, and the sizes of multiple second half locking blocks 7 are the same, so as to reduce the manufacturing difficulty.

[0047] In some embodiments, the limit piece is formed by protruding from the position of the shroud 22 corresponding to the gap towards the gap. Specifically, by extruding the position of the shroud 22 corresponding to the gap with an external tool, the extruded shroud 22 protrudes towards the gap to fill the gap.

[0048] Under this design method, it is ensured that the gap between two adjacent second half locking blocks 7 can be filled. At the same time, no other filling materials are needed, reducing the material cost.

[0049] It can be understood that in some other embodiments, the limit piece can also be composed of other components that can be filled in the gap.

[0050] In some embodiments, a groove is provided on the outer periphery of each shroud 22, and multiple grooves are connected end to end in sequence to form a dovetail groove 3. Under this design method, the dovetail groove 3 is formed by multiple grooves, and a single groove can be processed first, reducing the manufacturing difficulty.

[0051] The assembly method of the entire circle of blades provided by the embodiments of the present invention includes the following steps:

[0052] Step S1: Assemble multiple blade units 2 with integral shroud 22 in a full circle to form a full-circle blade, and form an annular dovetail groove 3 on the outer periphery of the shroud 22 of the full-circle blade. The dovetail groove 3 is divided into a full-circle arrangement side 4 and a staggered arrangement side 5.

[0053] Specifically, as shown in Figure 3 and Figure 4 , the blade unit 2 includes a shroud 22 and a plurality of blade bodies 21 arranged inside the shroud 22. The plurality of blade bodies 21 are arranged at intervals along the extension direction of the shroud 22, and the blade bodies 21 and the shroud 22 can be of an integral structure or a split structure, which can be selected according to actual requirements. Each blade unit 2 is a part of a full-circle blade. Therefore, after the plurality of blade units 2 are sequentially fitted and connected, they can form a circular full-circle blade. A groove is provided on the outer periphery of the shroud 22 of each blade body 21. After the plurality of grooves are sequentially connected end to end, they form a dovetail groove 3. The dovetail groove 3 is opened along the extension direction of the shroud 22. The dovetail groove 3 is divided into a full-circle arrangement side 4 and a staggered arrangement side 5 along the axial direction of the dovetail groove 3. The full-circle arrangement side 4 and the staggered arrangement side 5 are symmetrically arranged, and their cross-sections are both in the shape of a right trapezoid.

[0054] Step S2: Insert a single first half locking block 6 into the full-circle arrangement side 4 of the dovetail groove 3 along the groove opening of the dovetail groove 3.

[0055] Specifically, as shown in Figure 5 , the cross-sectional shape of the first half locking block 6 is in the shape of a right trapezoid. The maximum length b of the cross-section of the first half locking block 6 should be less than the length a of the groove opening cross-section of the dovetail groove 3. Therefore, the first half locking block 6 can be inserted into the dovetail groove 3 through the groove opening of the dovetail groove 3. Then, by pushing the first half locking block 6, the first half locking block 6 is moved to the full-circle arrangement side 4 of the dovetail groove 3. The hypotenuse side of the first half locking block 6 is in contact with the hypotenuse side of the dovetail groove 3, and the first half locking block 6 is opposite to the joint of the blade units 2, so as to connect two adjacent blade units 2.

[0056] Step S3: Insert a single second half locking block 7 into the staggered arrangement side 5 of the dovetail groove 3 along the groove opening of the dovetail groove 3, and arrange the first half locking block 6 and the second half locking block 7 side by side.

[0057] Specifically, the cross-sectional shape of the second half locking block 7 is in the shape of a right trapezoid, and the maximum length b of the cross-section of the second half locking block 7 should be less than the length a of the notch cross-section of the dovetail groove 3, so that the second half locking block 7 can be inserted into the dovetail groove 3 through the notch of the dovetail groove 3. Specifically, when inserting the second half locking block 7, the second half locking block 7 should avoid the already installed first half locking block 6, and then by pushing the second half locking block 7, the second half locking block 7 is moved to the staggered arrangement side 5 of the dovetail groove 3. The hypotenuse side of the second half locking block 7 is fitted with the hypotenuse side of the dovetail groove 3, and the second half locking block 7 is arranged side by side with the first half locking block 6, which is convenient for the subsequent alternating installation of multiple first half locking blocks 6 and multiple second locking blocks. The second half locking block 7 is also opposite to the joint of the blade monomer 2 to play a role in connecting two adjacent blade monomers 2.

[0058] Step S4: Repeat Step S2 and Step S3 until the multiple first half locking blocks 6 on the entire circle arrangement side 4 form a complete circle structure, and the joint of the blade monomer 2 is staggered from the joint of the first half locking block 6, and there is a placement opening for placing the second half locking block 7 left on the staggered arrangement side 5.

[0059] Specifically, in combination with Figure 1 and Figure 2 As shown, the multiple first half locking blocks 6 and the multiple second half locking blocks 7 are alternately installed in the manner of Step S2 and Step S3. After installation, the multiple first half locking blocks 6 form a complete circle structure on the entire circle arrangement side 4, and the joint of the blade monomer 2 is staggered from the joint of the first half locking block 6, so that the first half locking block 6 can play a role in connecting two adjacent blade monomers 2. In addition, during the installation process, the last installation position on the staggered arrangement side 5 matches the size of the second half locking block 7. However, since the first half locking block 6 on the corresponding side has been installed, the second half locking block 7 cannot be installed into the placement opening through the notch of the dovetail groove 3.

[0060] Step S5: Adjust the positions of the multiple second half locking blocks 7 on the staggered arrangement side 5, and the joint of the blade monomer 2 is staggered from the joint of the second half locking block 7, and at least some adjacent second half locking blocks 7 form gaps, and caulking treatment is performed on the multiple gaps.

[0061] Specifically, by pushing the second half locking blocks 7 along the circumferential direction of the misaligned side 5 to adjust the positions of the multiple second half locking blocks 7, during the adjustment process, the joint of the blade monomer 2 is staggered from the joint of the second half locking blocks 7, so that the second half locking blocks 7 can play the role of connecting two adjacent blade monomers 2. At the same time, gaps are formed between at least some adjacent second half locking blocks 7, and the sum of the sizes of the multiple gaps is the same as the size of the placement opening, so as to reduce the size of the placement opening formed between two adjacent second half locking blocks 7 and facilitate the overall caulking operation.

[0062] Under this assembly method, multiple blade monomers 2 are assembled in a full circle with their heads and tails connected. By alternately inserting multiple first half locking blocks 6 and multiple second half locking blocks 7 into the dovetail grooves 3 on the outer ring of the full circle of blades, the multiple blade monomers 2 can be closely attached in sequence, which can improve the integrity and vibration resistance of the full circle of blades.

[0063] In some embodiments, in step S5, the positions of the multiple second half locking blocks 7 on the misaligned side 5 are adjusted so that the multiple second half locking blocks 7 are arranged at equal intervals.

[0064] Under this operation, the gap sizes between two adjacent second half locking blocks 7 can be made the same, and then caulking treatment is performed on the multiple gaps with the same size, which increases the convenience of the operation. At the same time, it can ensure the uniformity and stability of the force on each second half locking block 7 and improve the integrity and vibration resistance of the full circle of blades.

[0065] In step S5, the position of the shroud 22 corresponding to the gap is extruded by an external tool, so that the extruded shroud 22 bulges towards the gap to fill the gap.

[0066] Under this design method, it is ensured that the gap between two adjacent second half locking blocks 7 can be filled. At the same time, no other filling materials are required, which reduces the material cost.

[0067] In some embodiments, the total length of the multiple gaps is the same as the length of a single second half locking block 7, that is, the length of the placement opening is the same as the length of the second half locking block 7. And because the sizes of the first half locking blocks 6 and the second half locking blocks 7 are the same, the placement opening with this size can be used for the installation of the last first half locking block 6 to meet the installation requirements.

[0068] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0069] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments described herein, but rather will conform to the broadest scope consistent with the principles and novel features of the utility model described herein.

Claims

1. A full circle blade, characterized in that: include: A full-circle blade body (1) comprises a plurality of blade monomers (2), wherein the outer peripheries of the plurality of annularly arranged blade monomers (2) form an annular dovetail groove (3), wherein the dovetail groove (3) is divided into a full-circle arrangement side (4) and a staggered arrangement side (5) along its axial direction; A plurality of first half locking blocks (6) are arranged end to end along the circumferential direction of the dovetail groove (3) within the full circle arrangement side (4), and the seams of the blade monomers (2) are staggered with the seams of the first half locking blocks (6); A plurality of second half locking blocks (7) are arranged along the circumference of the dovetail groove (3) within the offset arrangement side (5), and a gap is formed between at least two adjacent second half locking blocks (7). A plurality of the gaps are respectively provided with a limit piece, and the seam of the blade monomer (2) is staggered with the seam of the second half locking block (7).

2. The full-circle blade according to claim 1, characterized in that: The inner circle widths of the first half locking block (6) and the second half locking block (7) are smaller than the top notch width of the dovetail groove (3).

3. The full-circle blade according to claim 1, characterized in that: The cross-sections of the first half locking block (6) and the second half locking block (7) are both right-angled trapezoidal and symmetrical along the axis of the dovetail groove (3).

4. The full-circle blade according to claim 1, characterized in that: The straight length of the first half locking block (6) and the second half locking block (7) is L, and the straight length of the blade unit (2) is C, wherein:

5. The full-circle blade according to claim 1, characterized in that: The plurality of second half locking blocks (7) are arranged equidistantly so that the sizes of the plurality of gaps are the same.

6. The full-circle blade according to claim 1, characterized in that: The sum of the lengths of the plurality of gaps is the same as the length of a single second half locking block (7).

7. The full-circle blade according to claim 1, characterized in that: The first half locking block (6) and the second half locking block (7) have the same length.

8. The full-circle blade according to any one of claims 1 to 7, characterized in that: The blade monomer (2) comprises a shroud (22) and a plurality of blade bodies (21) arranged inside the shroud (22).

9. The full-circle blade according to claim 8, characterized in that: The limiting member is formed by the position of the circumferential belt (22) corresponding to the gap protruding in the direction of the gap.

10. The full-circle blade according to claim 8, characterized in that: A groove body is provided on the outer periphery of each of the circumferential belts (22), and a plurality of the groove bodies are connected end to end in sequence to form the dovetail groove (3).

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