阅读说明：本技术 一种压气机的引气结构 (Air entraining structure of air compressor ) 是由 张鑫 印雪梅 杨晓飞 于 2020-12-23 设计创作，主要内容包括：本申请属于压气机的引气结构设计技术领域,具体涉及一种压气机的引气结构,包括：1～N+1级静子叶片；1～N+1级转子叶片,与1～N+1级静子叶片相间分布；前机匣,包覆第1～N级静子叶片、第1～N-1级转子叶片,其上具有引气孔；中间机匣,包覆第N级转子叶片,与前机匣间具有引气通道；后机匣,包覆第N+1级静子叶片、第N+1级转子叶片,与中间机匣对接,外壁具有连接边；连接边与前机匣连接；前机匣、中间机匣、后机匣间形成引气腔；引气腔与引气孔、引气通道连通。(The application belongs to the technical field of air entraining structure design of a gas compressor, and particularly relates to an air entraining structure of the gas compressor, which comprises the following steps: 1-N +1 stage stator blade; 1-N +1 stage rotor blades and 1-N +1 stage stator blades are distributed alternatively; the front casing is used for coating the 1 st to N-stage stator blades and the 1 st to N-1 st-stage rotor blades and is provided with an air guide hole; the middle casing wraps the Nth-stage rotor blade and a gas-guiding channel is arranged between the middle casing and the front casing; the rear casing wraps the (N + 1) th-stage stator blade and the (N + 1) th-stage rotor blade, is butted with the middle casing, and has a connecting edge on the outer wall; the connecting edge is connected with the front casing; an air guide cavity is formed among the front casing, the middle casing and the rear casing; the air-bleed cavity is communicated with the air-bleed hole and the air-bleed channel.)

1. An air entraining structure of a compressor, comprising:

1-N +1 stage stator blade (1);

1-N +1 stage rotor blades (2) and 1-N +1 stage stator blades (1) are distributed alternatively;

the front casing (3) coats the 1 st to N-stage stator blades (1) and the 1 st to N-1 st stage rotor blades (2) and is provided with an air guide hole;

the middle casing (4) coats the Nth-stage rotor blade (2), and a gas-guiding channel is arranged between the middle casing and the front casing (3);

the rear casing (5) is coated with the (N + 1) th-stage stator blade (1) and the (N + 1) th-stage rotor blade (2), is butted with the middle casing (4), and has a connecting edge on the outer wall; the connecting edge is connected with the front casing (3); an air guide cavity is formed among the front casing (3), the middle casing (4) and the rear casing (5); the air-bleed cavity is communicated with the air-bleed hole and the air-bleed channel.

2. The air-entraining structure for an air compressor according to claim 1,

the front casing (3) is a two-half split casing, wherein one half is integrally formed with part of the 1 st to N-1 st-stage stator blades (1), and the other half is integrally formed with the other rest of the 1 st to N-1 st-stage stator blades.

3. The air-entraining structure for an air compressor according to claim 2,

the inner wall of the front casing (3) is provided with an N-1 level annular clamping groove; and the blade tip of the Nth-stage stator blade is clamped in the Nth-stage annular clamping groove.

4. The air-entraining structure for an air compressor according to claim 1,

an N + 1-stage annular clamping groove is formed between one end, facing the rear casing (5), of the middle casing (4) and the rear casing (4); the blade tip of the (N + 1) th stage stator blade (1) is clamped in the (N + 1) th stage annular clamping groove.

5. The air-entraining structure for an air compressor according to claim 1,

the air guide holes extend along the circumferential direction.

6. The air-entraining structure for an air compressor according to claim 5,

further comprising:

and a plurality of support ribs (8) arranged in the air guide hole in the longitudinal direction.

7. The air-entraining structure for an air compressor according to claim 6,

the support ribs (8) and the air guide holes are in rounded transition.

8. The air-entraining structure for an air compressor according to claim 5,

further comprising:

and the inlet of the air guide pipe (6) is butted with the air guide hole.

9. The air-entraining structure for an air compressor according to claim 8,

the outlet of the air guide pipe (6) is circular, and the inlet and the outlet of the air guide pipe are in smooth transition.

10. The air-entraining structure for an air compressor according to claim 1,

further comprising:

and the annular blade cascade (7) is arranged in the air guide channel and is supported between the front casing (3) and the middle casing (4).

Technical Field

The application belongs to the technical field of air entraining structure design of a gas compressor, and particularly relates to an air entraining structure of the gas compressor.

Background

In an aircraft engine, air is required to be introduced from an air compressor to cool high-temperature parts and seal a fulcrum structure.

With the development of the technology, the requirement for air entraining of the air compressor is higher and higher, the air entraining space is more and more compact under the conditions that the number of stages of the air compressor is reduced and the load is increased, the conventional air entraining structure cannot meet the air entraining requirement, and when the air entraining area is larger, the strength of the casing is easily and seriously weakened, so that the stability of the casing is reduced.

The present application has been made in view of the above-mentioned technical drawbacks.

It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present application.

Disclosure of Invention

The object of the present application is to provide a bleed air structure for a compressor that overcomes or alleviates at least one of the technical disadvantages of the known prior art.

The technical scheme of the application is as follows:

a bleed air structure for a compressor comprising:

1-N +1 stage stator blade;

1-N +1 stage rotor blades and 1-N +1 stage stator blades are distributed alternatively;

the front casing is used for coating the 1 st to N-stage stator blades and the 1 st to N-1 st-stage rotor blades and is provided with an air guide hole;

the middle casing wraps the Nth-stage rotor blade and a gas-guiding channel is arranged between the middle casing and the front casing;

the rear casing wraps the (N + 1) th-stage stator blade and the (N + 1) th-stage rotor blade, is butted with the middle casing, and has a connecting edge on the outer wall; the connecting edge is connected with the front casing; an air guide cavity is formed among the front casing, the middle casing and the rear casing; the air-bleed cavity is communicated with the air-bleed hole and the air-bleed channel.

According to at least one embodiment of the application, in the bleed air structure of the compressor, the front casing is a two-half split casing, wherein one half is integrally formed with part of the 1 st to N-1 st-stage stator blades, and the other half is integrally formed with the other rest of the 1 st to N-1 st-stage stator blades.

According to at least one embodiment of the application, in the air entraining structure of the air compressor, the inner wall of the front casing is provided with an N-1 stage annular clamping groove; and the blade tip of the Nth-stage stator blade is clamped in the Nth-stage annular clamping groove.

According to at least one embodiment of the application, in the bleed air structure of the air compressor, an N + 1-th stage annular clamping groove is formed between one end of the middle casing, which faces the rear casing, and the rear casing; the blade tip of the (N + 1) th stage stator blade is clamped in the (N + 1) th stage annular clamping groove.

According to at least one embodiment of the application, in the air bleed structure of the compressor, the air bleed holes extend along the circumferential direction.

According to at least one embodiment of the present application, the bleed air structure of the compressor further includes:

and the supporting ribs are arranged in the air guide holes along the length direction.

According to at least one embodiment of the application, in the bleed air structure of the compressor, the support ribs and the bleed air holes are in rounded transition.

According to at least one embodiment of the present application, the bleed air structure of the compressor further includes:

and the inlet of the air guide pipe is in butt joint with the air guide hole.

According to at least one embodiment of the present application, in the bleed structure of the compressor, the bleed pipe outlet is circular, and the inlet and the outlet of the bleed pipe are in smooth transition.

According to at least one embodiment of the present application, the bleed air structure of the compressor further includes:

and the annular blade cascade is arranged in the air guide channel and supported between the front casing and the middle casing.

Drawings

FIG. 1 is a schematic diagram of a bleed air structure of a compressor provided by an embodiment of the application;

FIG. 2 is a schematic view of a bleed air port and its support ribs provided by an embodiment of the present application;

figure 3 is a schematic view of a bleed air duct provided by an embodiment of the present application varying in cross-section from the inlet to the outlet;

wherein:

1-stator blade; 2-rotor blades; 3-front case; 4-an intermediate case; 5-rear case; 6-a gas-guiding pipe; 7-annular cascade;

NS-Nth stage stator vane; n + 1S-stage (N + 1) stator blade;

NR-Nth stage rotor blades; n + 1R-N +1 th stage rotor blades.

For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.

Detailed Description

In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general designs, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.

In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The word "comprising" or "comprises", and the like, when used in this description, is intended to specify the presence of stated elements or items, but not the exclusion of other elements or items.

Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.

The present application is described in further detail below with reference to fig. 1 to 3.

A bleed air structure for a compressor comprising:

1-N +1 stage stator blade 1;

1-N +1 stage rotor blades 2 and 1-N +1 stage stator blades 1 are distributed at intervals;

the front casing 3 coats the 1 st to N-stage stator blades 1 and the 1 st to N-1 st stage rotor blades 2 and is provided with an air guide hole;

the middle casing 4 coats the Nth-stage rotor blade 2 and is provided with a gas-guiding channel with the front casing 3;

the rear casing 5 is coated with the (N + 1) th-stage stator blade 1 and the (N + 1) th-stage rotor blade 2, is butted with the middle casing 4, and has a connecting edge on the outer wall; the connecting edge is connected with the front casing 3; an air guide cavity is formed among the front casing 3, the middle casing 4 and the rear casing 5; the air-bleed cavity is communicated with the air-bleed hole and the air-bleed channel.

For the air entraining structure of the air compressor disclosed in the above embodiment, as can be understood by those skilled in the art, the air after the nth stage stator blade 1 is introduced into the air entraining cavity through the air entraining channel and then is introduced out through the air entraining hole, the structure among the components is compact, the strength is high, the structure change of the air compressor is small, and the air entraining of the air compressor can be realized under the condition of the limitation of the shape contour and the axial dimension space of the air compressor.

In some optional embodiments, in the bleed air structure of the compressor, the front casing 3 is a two-half split casing, wherein one half is integrally formed with part of the 1 st to N-1 st stage stator blades 1, and the other half is integrally formed with the other remaining part of the 1 st to N-1 st stage stator blades.

For the air-entraining structure of the air compressor disclosed in the above embodiment, it can be understood by those skilled in the art that the front casing 3 is designed to be a two-half split structure and is integrally formed with the corresponding 1 st to N th stage stator blades, so that the machining precision can be ensured and the assembly is convenient.

In some optional embodiments, in the bleed air structure of the compressor, the inner wall of the front casing 3 is provided with an N-1 stage annular clamping groove; and the blade tip of the Nth-stage stator blade is clamped in the Nth-stage annular clamping groove.

In some optional embodiments, in the bleed air structure of the compressor, an N + 1-th stage annular clamping groove is formed between one end of the middle casing 4 facing the rear casing 5 and the rear casing 4; the blade tip of the (N + 1) th stage stator blade 1 is clamped in the (N + 1) th stage annular clamping groove.

For the bleed structure of the air compressor disclosed in the above embodiment, it can be understood by those skilled in the art that an N +1 th stage annular clip is formed between one end of the middle casing 4 facing the rear casing 5 and the rear casing 4, so as to cooperate to clip the N +1 th stage stator blade 1, and the stack assembly can be conveniently performed along the axial direction.

In some alternative embodiments, in the bleed air structure of the compressor, the bleed air holes extend in the circumferential direction.

With regard to the bleed air structure of the air compressor disclosed in the above embodiments, it can be understood by those skilled in the art that the bleed air hole on the front casing 3 is designed to extend along the circumferential direction, and may be substantially in the shape of a runway, so as to achieve a larger bleed air area under the condition of limited axial dimension of the air compressor.

In some optional embodiments, the bleed air structure of the compressor further includes:

and a plurality of support ribs 8 arranged in the air-entraining hole in the longitudinal direction.

As for the bleed air structure of the air compressor disclosed in the above embodiments, it can be understood by those skilled in the art that the support ribs provided in the bleed air holes can effectively ensure the strength of the front casing 3, and further increase the area of the bleed air holes on the premise of ensuring the strength of the front casing 3.

In some optional embodiments, in the bleed air structure of the compressor, the support ribs 8 and the bleed air holes are in rounded transition, so that the aerodynamic loss of bleed air from the compressor is reduced, and the stress concentration is avoided to enhance the bearing capacity of the structure.

In some optional embodiments, the bleed air structure of the compressor further includes:

the bleed air pipe 6, import and bleed hole butt joint, the export extends to high temperature component or fulcrum structure to can realize cooling the high temperature component or carrying out the obturage to the fulcrum structure.

In some optional embodiments, in the bleed air structure of the compressor, the outlet of the bleed air pipe 6 is circular, and the inlet and the outlet of the bleed air pipe are in smooth transition, so that the core control law can be the law of decreasing area, so as to ensure the structural strength of the bleed air pipe 6 and reduce the aerodynamic loss of bleed air from the compressor.

In some optional embodiments, the bleed air structure of the compressor further includes:

an annular cascade 7, which is arranged in the bleed air duct, is supported between the front casing 3 and the intermediate casing 4.

As for the bleed air structure of the compressor disclosed in the above embodiments, it can be understood by those skilled in the art that the annular cascade 7 is disposed between the front casing 3 and the middle casing 4, so as to provide support between the front casing 3 and the middle casing 4, so as to enhance the overall strength of the structure, and in addition, the blade profile can be optimized according to the actual situation, so as to reduce the pneumatic loss of bleed air from the compressor, and obtain better deformation control quality.

For the bleed air structure of the compressor disclosed in the above embodiments, it can be understood by those skilled in the art that the annular cascade 7 can be designed to be a two-half split structure for easy assembly.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.