A tandem blade structure with variable circumferential and axial positions of front and rear blades
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AECC SHENYANG ENGINE RES INST
- Filing Date
- 2026-06-17
- Publication Date
- 2026-08-04
AI Technical Summary
采用可调静子结构的可变几何串列叶片，主要针对前排叶片气流方向对后排叶片性能影响研究方面，虽然会使前后排叶片相对位置关系变化，但其变化量无法做到孤立，同样，该方案也主要针对二维叶片
[0027] A tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades is provided, which can easily realize the adjustment of the circumferential and axial positions of the front and rear rows of real three-dimensional tandem blades. The variable structure is compressed onto a simple and offset axial adjustment pad, which can greatly reduce the test cost.
Smart Images
Figure CN122504657A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of experimental design of tandem blades for aero-engine compression components, specifically relating to a tandem blade structure in which the circumferential and axial positions of the front and rear rows of blades can be varied. Background Technology
[0002] With the continuous development of aero-engines, the load levels of compression components such as compressors are constantly increasing, and conventional single-blade compressors can no longer meet the requirements. Tandem compressors are receiving increasing attention. Tandem compressors achieve performance that single-blade compressors cannot achieve through two rows of blades, making a significant contribution to improving the load and performance levels of compression components.
[0003] The tandem blades of the compression components of an aero-engine are divided into front and rear rows of blades. Their performance is not only affected by the performance of the front and rear rows of blades themselves, but also greatly related to the relative positions of the front and rear rows of blades.
[0004] For experimental research on tandem blades of aero-engine compression components, the adjustment of the relative position relationship between the front and rear rows of blades currently involves two forms: variable geometry tandem blades with different grid plates and variable geometry tandem blades with adjustable stator structures.
[0005] Variable geometry tandem blades using different gratings are only suitable for two-dimensional blades and require multiple sets of different gratings, resulting in high costs. Variable geometry tandem blades with adjustable stator structures are mainly used to study the impact of airflow direction of the front row blades on the performance of the rear row blades. Although this changes the relative positional relationship between the front and rear rows of blades, the amount of change cannot be isolated. Similarly, this approach is also mainly aimed at two-dimensional blades.
[0006] Currently, there is a lack of a structure that facilitates the adjustment of the circumferential and axial positions of the front and rear rows of blades for practical three-dimensional tandem blades, and allows for low-cost experimental research. Therefore, this application is submitted. Summary of the Invention
[0007] The purpose of this application is to provide a tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades, in order to overcome or mitigate at least one of the known technical defects.
[0008] The technical solution of this application is:
[0009] A tandem blade structure with variable circumferential and axial positions of front and rear rows of blades includes a front row blade ring, a rear row blade ring, an axial adjustment pad, and positioning bolts.
[0010] The front row blade ring includes a front row outer ring, a front row inner ring disposed within the front row outer ring, and multiple front row blades connected circumferentially between the front row outer ring and the front row inner ring.
[0011] The front outer ring has a front outward folded edge, and the front outward folded edge has multiple front positioning holes distributed along the circumference;
[0012] The rear blade ring is coaxially arranged behind the front blade ring, including a rear outer ring, a rear inner ring arranged inside the rear outer ring, and multiple rear blades connected circumferentially between the rear outer ring and the rear inner ring.
[0013] The front edge of the rear outer ring extends forward and covers the outside of the front outer ring, and has a rear outward folded edge with multiple rear positioning holes distributed circumferentially.
[0014] The axial adjustment shim is annular and is placed between the front and rear outward folded edges, and has multiple positioning and fitting holes distributed circumferentially.
[0015] There are multiple positioning bolts that run through each of the front row positioning holes, positioning mating holes, and rear row positioning holes. They connect the front row outward folded edges, axial adjustment shims, and rear row outward folded edges, thereby connecting the front row blade rings and the rear row blade rings to form a tandem blade structure.
[0016] According to at least one embodiment of this application, the above-described tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades further includes mounting bolts.
[0017] The front outward-facing flange has multiple front mounting holes distributed circumferentially.
[0018] The rear outward folded edge has multiple rear mounting holes distributed circumferentially;
[0019] The axial adjusting shim has multiple positioning and fitting holes distributed circumferentially;
[0020] There are multiple mounting bolts, which run through all the front mounting holes, mounting mating holes, and rear mounting holes.
[0021] According to at least one embodiment of this application, in the above-described tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades, each mounting bolt is connected to the test casing.
[0022] According to at least one embodiment of this application, in the above-mentioned tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades, the front row mounting hole on the outer ring of the front row is located inside the front row positioning hole, and the front row mounting hole is strip-shaped.
[0023] The rear mounting holes on the outer ring of the rear row are located inside the rear positioning holes;
[0024] The mounting hole on the axial adjusting shim is located inside the positioning hole, and the positioning hole is strip-shaped.
[0025] According to at least one embodiment of this application, in the above-described tandem blade structure with variable circumferential axial position of the front and rear rows of blades, the leading edge of the rear inner ring extends forward and abuts against the inner side of the rear end of the front inner ring.
[0026] This application has at least the following beneficial technical effects:
[0027] A tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades is provided, which can easily realize the adjustment of the circumferential and axial positions of the front and rear rows of real three-dimensional tandem blades. The variable structure is compressed onto a simple and offset axial adjustment pad, which can greatly reduce the test cost. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of a tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades provided in an embodiment of this application;
[0029] Figure 2 This is a schematic diagram of the front blade ring and its partial structure provided in an embodiment of this application;
[0030] Figure 3 This is a schematic diagram of the rear blade ring and its partial structure provided in an embodiment of this application;
[0031] Figure 4 This is a schematic diagram of the axial adjustment pad and its partial structure provided in the embodiments of this application;
[0032] in:
[0033] 1-Front row blade ring; 2-Rear row blade ring; 3-Axial adjustment shim; 4-Positioning bolt; 5-Mounting bolt;
[0034] 11-Front row outer ring; 12-Front row inner ring; 13-Front row blade; 14-Front row outward folding edge;
[0035] 21-Rear outer ring; 22-Rear inner ring; 23-Rear blade; 24-Rear outward folded edge.
[0036] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation
[0037] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.
[0038] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.
[0039] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable 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. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.
[0040] A tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades, such as... Figure 1 As shown, it includes a front impeller ring 1, a rear impeller ring 2, an axial adjustment shim 3, a positioning bolt 4, and a mounting bolt 5.
[0041] The front row blade ring 1 includes a front row outer ring 11, a front row inner ring 12 disposed within the front row outer ring 11, and a plurality of front row blades 13 circumferentially connected between the front row outer ring 11 and the front row inner ring 12, such as... Figure 2 As shown.
[0042] The front edge of the front outer ring 11 has a front outward folded edge 14, which has multiple front positioning holes distributed along the circumference and multiple front mounting holes distributed along the circumference. The front mounting holes are located inside the front positioning holes and are strip-shaped.
[0043] The rear row blade ring 2 is coaxially arranged behind the front row blade ring 1, and includes a rear row outer ring 21, a rear row inner ring 22 disposed within the rear row outer ring 21, and a plurality of rear row blades 23 circumferentially connected between the rear row outer ring 21 and the rear row inner ring 22, such as... Figure 3 As shown.
[0044] The front edge of the rear outer ring 22 extends forward and covers the outside of the front outer ring 11, and has a rear outer flange 24. The rear outer flange 24 has multiple rear positioning holes distributed along the circumference, as well as multiple rear mounting holes distributed along the circumference. The rear mounting holes are located inside the rear positioning holes.
[0045] The front edge of the rear inner ring 22 extends forward and rests against the inner rear end of the front inner ring 12.
[0046] The axial adjusting shim 3 is annular and is placed between the front outward folded edge 14 and the rear outward folded edge 24. It has multiple circumferentially distributed positioning holes and multiple circumferentially distributed mounting holes. The mounting holes are located inside the positioning holes, and the positioning holes are strip-shaped. Figure 4 As shown.
[0047] There are multiple positioning bolts 4, which are set through each front row positioning hole, positioning mating hole and rear row positioning hole. They connect the front row outward folded edge 14, axial adjustment shim 3 and rear row outward folded edge 24 to realize the connection between the front row blade ring 1 and the rear row blade ring 2, forming a tandem blade structure. The front row mounting hole is designed to be strip-shaped, which can leave a margin for the alignment between positioning holes and facilitate assembly.
[0048] Multiple mounting bolts 5 are provided, passing through each front row mounting hole, mounting mating hole, and rear row mounting hole. They further connect the front row outward folded edge 14, the axial adjustment shim 3, and the rear row outward folded edge 24, realizing the connection between the front row blade ring 1 and the rear row blade ring 2, forming a tandem blade structure. This structure can be connected to the test casing to fix the tandem blade structure, facilitating the test. The front row mounting mating holes are designed in a strip shape, which allows for the alignment between the mounting holes and facilitates assembly.
[0049] The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades disclosed in the above embodiments can adjust the relative positions of different front and rear mounting holes in the circumferential direction by rotating the front blade ring 1 and the rear blade ring 2 relative to each other, and fix them with positioning bolts 4 to achieve adjustment of the circumferential position of the front and rear rows of blades. In addition, the axial position of the front and rear rows of blades can be adjusted by selecting axial adjustment pads 3 of different thicknesses.
[0050] Based on the tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades disclosed in the above embodiments, during the test, an axial adjustment shim 3 of relatively thick thickness can be selected according to the adjustment requirements of the axial positions of the front and rear rows of blades and placed between the front row outward folded edge 14 and the rear row outward folded edge 24. Then, according to the adjustment requirements of the circumferential positions of the front and rear rows of blades, the front row blade ring 1 and the rear row blade ring 2 are rotated relative to each other so that the corresponding different front row mounting holes and rear row mounting holes are aligned. After that, the positioning bolt 4 and the mounting bolt 5 are installed.
[0051] The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades disclosed in the above embodiments can easily achieve adjustment of the circumferential and axial positions of the front and rear rows of real three-dimensional tandem blades. The variable structure is compressed onto a simple and offset axial adjustment pad, which can greatly reduce the test cost.
[0052] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.
Claims
1. A tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades, characterized in that, Includes front impeller (1), rear impeller (2), axial adjustment pad (3), and positioning bolt (4); The front row blade ring (1) includes a front row outer ring (11), a front row inner ring (12) disposed inside the front row outer ring (11), and a plurality of front row blades (13) connected circumferentially between the front row outer ring (11) and the front row inner ring (12). The front outer ring (11) has a front outward folded edge (14) at its front edge, and the front outward folded edge (14) has multiple front positioning holes distributed along the circumferential direction; The rear blade ring (2) is coaxially arranged behind the front blade ring (1), including a rear outer ring (21), a rear inner ring (22) arranged inside the rear outer ring (21), and a plurality of rear blades (23) circumferentially connected between the rear outer ring (21) and the rear inner ring (22). The front edge of the rear outer ring (22) extends forward and covers the outside of the front outer ring (11), and has a rear outward folded edge (24), which has multiple rear positioning holes distributed along the circumferential direction; The axial adjustment pad (3) is annular and is placed between the front row outward folded edge (14) and the rear row outward folded edge (24). It has multiple positioning and fitting holes distributed along the circumference. There are multiple positioning bolts (4), which are set through each front row positioning hole, positioning mating hole and rear row positioning hole to connect the front row outward folded edge (14), axial adjustment pad (3) and rear row outward folded edge (24) to realize the connection between the front row blade ring (1) and the rear row blade ring (2) to form a tandem blade structure.
2. The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades according to claim 1, characterized in that, It also includes mounting bolts (5); The front outward folded edge (14) has multiple front mounting holes distributed along the circumference; The rear outward folded edge (24) has multiple rear mounting holes distributed along the circumferential direction; The axial adjusting pad (3) has multiple positioning and fitting holes distributed circumferentially; There are multiple mounting bolts (5), which are set through each front row mounting hole, mounting mating hole and rear row mounting hole.
3. The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades according to claim 2, characterized in that, Each mounting bolt (5) is connected to the test housing.
4. The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades according to claim 3, characterized in that, The front row mounting holes on the outer ring (11) are located inside the front row positioning holes, and the front row mounting holes are strip-shaped. The rear mounting holes on the outer ring (22) are located inside the rear positioning holes; The mounting hole on the axial adjustment pad (3) is located inside the positioning hole, and the positioning hole is strip-shaped.
5. The tandem blade structure with variable circumferential and axial positions of the front and rear rows of blades according to claim 4, characterized in that, The front edge of the rear inner ring (22) extends forward and rests against the inner rear end of the front inner ring (12).