CN219299612U

CN219299612U - Novel axial compressor blade tenon structure

Info

Publication number: CN219299612U
Application number: CN202223252115.9U
Authority: CN
Inventors: 王培桎; 李梅; 李志刚; 罗文瑞
Original assignee: Chengdu Chengfa Science & Technology Power Engineering Co ltd
Current assignee: Chengdu Chengfa Science & Technology Power Engineering Co ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-07-04
Anticipated expiration: 2032-12-05

Abstract

The utility model provides a novel tenon structure of an axial flow compressor blade, wherein two side surfaces of a tenon are respectively a basin side surface and a back side surface, the basin side surface and the back side surface are both of curved surface structures, the basin side surface and the back side surface of the tenon are both provided with curved surface structures, the surface area of the tenon is increased, the contact area between the surface of the tenon and the surface of a corresponding rotor mortice is increased, the complex stress born by the unit surface area of the tenon is reduced, the risk of breaking the blade is reduced, the service life of the blade is prolonged, and the safe and stable operation of a unit is ensured; in the process of processing the basin side surface and the back side surface of the tenon into curved surfaces, partial materials can be cut off to form the curved surfaces, and the whole weight of the tenon can be reduced on the premise of ensuring the strength of the tenon.

Description

Novel axial compressor blade tenon structure

Technical Field

The utility model relates to the technical field of impeller mechanical blade structure design, in particular to a novel axial flow compressor blade tenon structure.

Background

At present, the molded lines of the tenon basin side and the tenon back side of the rotor blade of the small and medium axial flow compressor applied to the metallurgical, petrochemical and pharmaceutical fields are mostly linear, for example, the prior application number is CN202010157763.2, the name is an utility model patent of a turbine rotor device with a compression structure, and the molded lines of the tenon basin side and the tenon back side in the utility model are linear. According to design analysis and a great amount of engineering practice experience, the linear tenon structure has the problem that the unit surface area of the tenon is stressed more and the weight of the tenon is heavier.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a novel tenon structure of an axial flow compressor blade, which solves the problems that the linear tenon structure in the prior art is larger in stress on unit surface area and heavier in tenon weight.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a novel axial compressor blade tenon structure, the both sides face of tenon are basin side and dorsal surface respectively, and basin side and dorsal surface are curved surface structure.

The utility model relates to a novel blade tenon structure of an axial flow compressor, which comprises the following basic principles: on the premise of unchanged length of the tenon in the axial direction, the basin side surface and the back side surface of the tenon are provided with curved surface structures, so that the surface area of the tenon is increased, the contact area between the surface of the tenon and the surface of a corresponding rotor tenon slot is increased, the complex stress born by the unit surface area of the tenon is reduced, the risk of breakage of a blade is reduced, the service life of the blade is prolonged, and the safe and stable operation of a unit is ensured; in the process of processing the basin side surface and the back side surface of the tenon into curved surfaces, partial materials can be cut off to form the curved surfaces, and the whole weight of the tenon can be reduced on the premise of ensuring the strength of the tenon.

Further, as a specific setting mode of the cross section of the tenon end, the cross section of the tenon end is of a dovetail structure, and the tenon forms the dovetail structure, so that the dovetail structure has the advantages of convenience in assembly and disassembly, convenience in processing, reduction in stress concentration and the like.

Further, the tenon is formed by sweeping the cross section of the end part along a curve, and the top projection curve of the basin side surface and the back side surface is a group of concentric circular arcs. When the tenon is installed, the tenon is directly rotated into the rotor mortise, and the installation is convenient.

Further, an included angle alpha is arranged between the bottom of the tenon and the horizontal plane, and the included angle alpha ranges from 1 degree to 5 degrees.

Further, a throat opening which is reduced inwards is formed at the joint of the top of the tenon and the blade, the outer wall of the part of the tenon below the throat opening is a tenon pressure-bearing surface, a gap is formed between the tenon pressure-bearing surface and the tenon groove, and the gap is 0.1-0.6 mm. The tenon is convenient to assemble, and meanwhile, the strength of the connecting structure between the tenon and the tenon groove is improved.

The beneficial effects of the utility model are as follows:

1. according to the novel axial flow compressor blade tenon structure, on the premise that the length of the tenon in the axial direction is unchanged, the basin side surface and the back side surface of the tenon are provided with the curved surface structures, so that the surface area of the tenon is increased, the contact area between the surface of the tenon and the surface of a corresponding rotor mortice is increased, the complex stress born by the unit surface area of the tenon is reduced, the risk of breakage of the blade is reduced, the service life of the blade is prolonged, and the safe and stable operation of a unit is ensured.

2. According to the novel axial flow compressor blade tenon structure, in the process of machining the basin side surface and the back side surface of the tenon into the curved surfaces, part of materials can be cut off to form the curved surfaces, and on the premise of ensuring the tenon strength, the whole weight of the tenon can be reduced, and the whole weight of a rotor of the axial flow compressor is also reduced.

3. According to the novel axial flow compressor blade tenon structure, overlooking projection curves of the basin side face and the back side face of the tenon are a group of concentric circular arcs. When the tenon is installed, the tenon is directly rotated into the rotor mortise, and the installation is convenient.

Drawings

FIG. 1 is a schematic diagram of a front view of a novel axial flow compressor blade dovetail configuration.

FIG. 2 is a schematic top view projection of a novel axial flow compressor blade dovetail configuration.

FIG. 3 is a schematic view of the structure of a cross section of the tenon end.

FIG. 4 is a diagram comparing novel axial flow compressor blade dovetail structure with existing products.

Wherein, 1, tenon; 2. a blade; 3. a basin side; 4. a back side; 5. the cross section of the tenon end part; 6. a laryngeal opening; 7. a tenon bearing surface; 8. the existing tenon; 9. and a hatched portion.

Detailed Description

The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.

As shown in fig. 1 to 4, according to the novel axial flow compressor blade tenon structure provided by the utility model, two side surfaces of the tenon 1 are a basin side surface 3 and a back side surface 4 respectively, and the basin side surface 3 and the back side surface 4 are both of curved surface structures. An included angle alpha is arranged between the bottom of the tenon 1 and the horizontal plane, and the included angle alpha ranges from 1 degree to 5 degrees.

On the premise that the length of the tenon 1 in the axial direction is unchanged, the basin side surface 3 and the back side surface 4 of the tenon 1 are respectively provided with a curved surface structure, so that the surface area of the tenon 1 is increased, the contact area between the surface of the tenon 1 and the surface of a corresponding rotor tenon groove is increased, the complex stress born by the unit surface area of the tenon 1 is reduced, the risk of breakage of a blade 2 is reduced, the service life of the blade is prolonged, and the safe and stable operation of a unit is ensured; in the process of processing the basin side surface 3 and the back side surface 4 of the tenon 1 into curved surfaces, partial materials can be cut off to form the curved surfaces, and the whole weight of the tenon 1 can be reduced on the premise of ensuring the strength of the tenon 1.

As shown in fig. 2, the tenon 1 is formed by sweeping the cross section of the end part along a curve, and the top projection curves of the basin side surface 3 and the back side surface 4 are a set of concentric circular arcs. When the tenon 1 is installed, the tenon 1 is directly rotated into the rotor mortise, and the installation is convenient.

As shown in FIG. 3, the cross section 5 of the end part of the tenon is in a dovetail structure, and the tenon forms the dovetail structure, so that the tenon has the advantages of convenience in assembly and disassembly, convenience in processing, reduction in stress concentration and the like.

Specifically, as shown in fig. 3, a throat 6 which is reduced towards the axial direction of the tenon 1 is arranged at the joint of the top of the tenon 1 and the blade 2, the outer wall of the part of the tenon 6 below the throat 6 is a tenon pressure-bearing surface 7, and a gap L is arranged between the tenon pressure-bearing surface 7 and the tenon groove and is 0.1-0.6 mm.

As shown in fig. 4, fig. 4 is a comparison diagram of a novel axial flow compressor blade tenon structure and an existing product, on the same horizontal projection plane, basin side and back side tenon molded lines of the existing tenon 8 structure are linear, and vertical projection lines of a basin side surface 3 and a back side surface 4 of the tenon 1 in the scheme are circular arcs. On the premise that the length D of the tenon 1 in the axial direction is unchanged, the arc-shaped tenon 1 structure has larger tenon surface area, so that the contact area between the surface of the tenon 1 and the surface of a corresponding rotor tenon groove is increased, the complex stress born by the unit surface area of the tenon 1 is reduced, the risk of breakage of the blade 2 is reduced, and the service life of the blade 2 is prolonged. The three shaded portions 9 marked in fig. 4 are portions, which can be cut off during machining, of the novel blade tenon structure, and on the premise that the length D of the tenon axis direction is unchanged, the novel blade tenon 1 structure reduces the weight of the tenon 1 while guaranteeing the tenon strength, so that the overall weight of the rotor of the axial-flow compressor is reduced.

Claims

1. The novel tenon structure of the axial flow compressor blade is characterized in that two side surfaces of the tenon are a basin side surface and a back side surface respectively, and the basin side surface and the back side surface are both of curved surface structures;

the cross section of the end part of the tenon is of a dovetail structure;

the tenon is formed by sweeping the cross section of the end part of the tenon along a curve, and the overlooking projection curves of the basin side surface and the back side surface are a group of concentric circular arcs;

an included angle alpha is arranged between the bottom of the tenon and the horizontal plane, and the range of the included angle alpha is 1-5 degrees;

the blade is characterized in that a throat which is reduced inwards is formed in the joint of the top of the tenon and the blade, the outer wall of the part, below the throat, of the tenon is a tenon bearing surface, a gap is formed between the tenon bearing surface and the tenon groove, and the gap is 0.1-0.6 mm.