CN110284929B

CN110284929B - Turbine cartridge receiver structure of obturaging

Info

Publication number: CN110284929B
Application number: CN201910655984.XA
Authority: CN
Inventors: 汤旭; 李守秋; 徐鹏; 牛俊涛; 张倩
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2021-10-22
Anticipated expiration: 2039-07-19
Also published as: CN110284929A

Abstract

The application belongs to the field of casing sealing structure design, and particularly relates to a turbine casing sealing structure. The method comprises the following steps: sealing piece, backplate and pin. The first end of the guide blade is provided with a connecting part matched with the high-pressure turbine casing, the connecting part is provided with a pin hole, and the second end of the guide blade is connected with the low-pressure turbine casing; a plurality of sealing sheets are matched with the guide blades and comprise sealing parts and tightening parts which are arranged in an L shape, the sealing parts are connected with the connecting parts of the guide blades and the high-pressure turbine casing, and the tightening parts are abutted against the guide blades; the back plate is arranged on the sealing parts of two adjacent sealing sheets and used for preventing air leakage between the sealing parts of the two sealing sheets; the pin is used for fixedly connecting the sealing part of the sealing piece and the back plate with the connecting part of the guide blade. This application adopts the piece structure of obturating to guarantee closely to laminate, and the pin is fixed near the contact position of obturating, and it is effectual to obturate, structure reliable operation.

Description

Turbine cartridge receiver structure of obturaging

Technical Field

The application belongs to the field of casing sealing structure design, and particularly relates to a turbine casing sealing structure.

Background

The sealing structure design between the high-low pressure turbine casings is a problem which needs to be researched in the turbine structure design of the aircraft engine, and plays a role in sealing between the high-low pressure turbine casings, preventing cold air from leaking and ensuring the working efficiency of the engine.

The sealing structure commonly used in the prior art is a sealing form combining an elastic clip and a sealing sheet structure. As shown in figure 1, an elastic clamp 10 is assembled on a turbine casing 13, a first pin 11 is used for positioning and fastening, a first sealing piece 8 is assembled in a space reserved in the casing, one surface of the first sealing piece is attached to the casing 7, the other surface of the first sealing piece is elastically fixed in the axial direction by the elastic clamp 10, in order to prevent air leakage caused by gaps among circumferential sealing pieces, a second sealing piece 9 is additionally arranged at the gap, the circumferential sealing pieces are prevented from rotating by the second pin 12, and the anti-rotating second pin 12 is fixed on the casing. The prior art has the following defects: the sealing sheet can work reliably, the elastic clamp is required to be always kept in an elastic state, the elastic clamp has a structural failure risk after multiple times of thermal cycle work, the whole sealing effect cannot be guaranteed after failure, and the elastic clamp cannot support the sealing sheet to cause air leakage due to the fact that the elastic clamp has large pressure difference in certain engine transition states; the sealing piece realizes circumferential rotation prevention by pins, two pin positioning holes are designed into a round hole and a runway hole to ensure that assembly can be achieved, the matching clearance of the pins is too large, the hidden danger of air leakage exists, and the sealing effect is poor; the elastic clamp and the sealing sheet are positioned by two pins, so that the number of parts is large, the processing technology is complex, the cost is high, and the assembly procedure is complex.

Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.

Disclosure of Invention

It is an object of the present application to provide a turbine case seal arrangement to address at least one of the problems of the prior art.

The technical scheme of the application is as follows:

a turbine case seal structure comprising:

the guide vane comprises a guide vane body, a guide vane and a guide vane, wherein a first end of the guide vane body is provided with a connecting part matched with a high-pressure turbine casing, the connecting part is provided with a pin hole, and a second end of the guide vane body is connected with a low-pressure turbine casing;

the sealing pieces are matched with the guide blades and comprise sealing parts and tightening parts which are arranged in an L shape, the sealing parts are connected with the connecting parts of the guide blades and the high-pressure turbine casing, and the tightening parts are abutted against the guide blades;

the back plate is arranged on the sealing parts of two adjacent sealing sheets and used for preventing air leakage between the sealing parts of the two sealing sheets;

and the pin is used for fixedly connecting the sealing part of the sealing piece and the back plate with the guide blade connecting part.

Optionally, one end of the back plate has a bending portion, and the bending portion wraps an end of the sealing portion of the sealing sheet.

Optionally, one end of the pin has a cap head, and the diameter of the cap head is larger than that of the pin hole of the connecting part.

Optionally, the other end of the pin is fixed by flaring.

Optionally, the other end of the pin is fixed by welding.

The invention has at least the following beneficial technical effects:

the utility model provides a turbine casket structure of obturating adopts elasticity piece structure of obturating to guarantee closely to laminate, adopts the pin to fix near the contact position of obturating, and the effectual of obturating, structure reliable operation.

Drawings

FIG. 1 is a schematic view of a prior art seal structure;

FIG. 2 is a schematic illustration of a turbine case seal configuration according to an embodiment of the present application;

fig. 3 is a view of the sealing sheet a of fig. 2.

Wherein:

1-a low pressure turbine case; 2-a back plate; 3-sealing the sheet; 4-a high pressure turbine case; 5-a pin; 6-guide vanes; 7-a casing; 8-a first sealing sheet; 9-a second sealing sheet; 10-an elastic clip; 11-a first pin; 12-a second pin; 13-turbine case.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.

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

The application provides a turbine casing structure of obturating includes: a sealing sheet 3, a back plate 2 and pins 5.

Specifically, a first end of the guide vane 6 is provided with a connecting part matched with the high-pressure turbine casing 4, the connecting part is provided with a pin hole, and a second end of the guide vane 6 is connected with the low-pressure turbine casing 1; a plurality of sealing sheets 3 are matched with the guide blades 6, each sealing sheet 3 comprises a sealing part and a tightening part which are arranged in an L shape, the sealing parts are connected with the connecting parts of the guide blades 6 and the high-pressure turbine casing 4, and the tightening parts are abutted against the guide blades 6; the back plate 2 is arranged on the sealing parts of two adjacent sealing sheets 3 and is used for preventing air leakage between the sealing parts of the two sealing sheets 3; the pin 5 is used for fixedly connecting the sealing part of the sealing sheet 3 and the connecting part of the back plate 2 and the guide vane 6. The opening size of the sealing piece 3 in a free state is slightly larger than the corresponding matching size of the guide blade 6, and the sealing piece can be tightly attached to the matching surfaces of the guide blade 6 and the high-pressure turbine casing 4 after being elastically assembled in place, so that the air tightness is ensured.

The utility model provides a turbine case structure of obturating, through installing backplate 2 in the clearance department of 3 circumference of adjacent two pieces of obturating, guarantee circumference airtight, rely on pin 5 to realize the location. Advantageously, in this embodiment, after the hole of the pin 5 is enlarged, the upper end of the back plate 2 is bent to wrap the sealing sheet 3, so that the local rigidity of the sealing sheet 3 can be increased, and the sealing sheet 3 is prevented from being separated from the high-pressure turbine casing 4 due to severe pressure change in the transient state of the engine, so that the sealing fails in a short time.

The utility model provides a turbine casket structure of obturating, the piece 3 of obturating assemble the back of targetting in place and realize the location through pin 5, and the cap head diameter of pin 5 is greater than the opening diameter in the pin hole of the connecting portion of guide vane 6, can guarantee absolute seal, and the unable invasion of mainstream gas. After the back plate 2 and the sealing sheet 3 are assembled in place, the pins 5 can be fastened through flaring or welding. The pin 5 plays a role in positioning and fastening, the number of parts is small, the structure and the process are simple, the processing cost is low, the assembly is easy, the sealing performance is better, and the economic cost is lower.

The utility model provides a turbine casket structure of obturating adopts elasticity piece structure of obturating to guarantee closely to laminate, adopts the pin fixed near the contact position of obturating, and the backplate tip has wrapped up elasticity piece of obturating, has increased local rigidity, and the effect of obturating is good, structure reliable operation. This application realizes location, fastening through the pin, and part simple structure, the manufacturability is good, and is with low costs, and the part number reduces more than 20%, and assembly manufacturability is good.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A turbine case seal structure, comprising:

the guide vane structure comprises guide vanes (6), wherein a first end of each guide vane (6) is provided with a connecting part matched with a high-pressure turbine casing (4), the connecting part is provided with a pin hole, and a second end of each guide vane (6) is connected with a low-pressure turbine casing (1);

the sealing pieces (3) are matched with the guide blades (6) in a plurality, each sealing piece (3) comprises a sealing part and a tightening part which are arranged in an L shape, the sealing parts are connected with the connecting parts of the guide blades (6) and the high-pressure turbine casing (4), the tightening parts are abutted against the guide blades (6), the opening size of each sealing piece (3) in a free state is slightly larger than the corresponding matching size of each guide blade (6), and the sealing pieces are assembled in place by means of elasticity;

the back plate (2) is arranged on the sealing parts of two adjacent sealing sheets (3) and used for preventing air leakage between the sealing parts of the two sealing sheets (3);

the pin (5), pin (5) are used for with the portion of obturating piece (3) with backplate (2) with guide vane (6) connecting portion fixed connection.

2. The turbine casing sealing structure according to claim 1, wherein one end of the back plate (2) has a bent portion, and the bent portion wraps an end of the sealing portion of the sealing sheet (3).

3. The turbine case seal structure according to claim 1, wherein one end of the pin (5) has a cap head having a diameter larger than a pin hole of the connection portion.

4. The turbine casing sealing structure according to claim 3, wherein the other end of the pin (5) is fixed by flaring.

5. The turbine case seal structure according to claim 3, wherein the other end of the pin (5) is fixed by welding.