CN-121993264-A - Gas turbine metal cloth sealing structure

Abstract

The invention discloses a gas turbine metal cloth sealing structure which comprises two metal tooth-shaped gaskets, a metal sheet and two layers of flexible metal woven mesh fabrics, wherein the two layers of flexible metal woven mesh fabrics are combined to form a flexible metal cloth sealing piece. The flexible metal cloth sealing piece is arranged in the static component sealing groove, and the air flow pressure difference is used for jointing the end face of the groove, so that the effective sealing of the leakage gap is realized. The invention adopts a tooth-shaped structure to prolong the length of the airflow path and prevent the airflow from flowing, and adds two layers of flexible metal woven mesh fabrics on the upper side and the lower side of the metal sheet, so that even if the sealing groove is misplaced, the sealing groove can always keep surface-to-surface contact with the bottom of the groove, the extra abrasion and the flowing resistance of the sealing are increased, the structural rigidity is not influenced, and the sealing reliability is improved. The structure improves the adaptability and the safety of the gas turbine sealing device on the basis of optimizing the sealing performance of the traditional metal sheet.

Inventors

• JIANG WENBIN
• HOU YUHANG
• LI YINGYING
• HU YAPING
• QUE XIAOBIN

Assignees

• 中国联合重型燃气轮机技术有限公司

Dates

Publication Date

20260508

Application Date

20260203

Claims (8)

1. 1. A gas turbine metal cloth sealing structure is used for being installed between two static interaction components of a gas turbine and is characterized by comprising a metal sheet (35), an upper flexible metal woven mesh (33) covered on the upper surface of the metal sheet (35), a lower flexible metal woven mesh (34) covered on the lower surface of the metal sheet (35), a left metal tooth-shaped gasket (31) covered on the upper surface of the upper flexible metal woven mesh (33), a right metal tooth-shaped gasket (32) covered on the upper surface of the lower flexible metal woven mesh (34), a plurality of projected metal teeth which are arranged in parallel are arranged on the upper surfaces of the left metal tooth-shaped gasket (31) and the right metal tooth-shaped gasket (32), the sizes and the sizes of the left metal tooth-shaped gasket (31) and the right metal tooth-shaped gasket (32) are identical, a gap is reserved between the left metal tooth-shaped gasket (31) and the right metal tooth-shaped gasket (32), and the upper flexible metal woven mesh (33) is exposed from the gap.
2. 2. The gas turbine metal cloth seal structure of claim 1, wherein tooth surfaces of the left metal tooth form shim (31) and the right metal tooth form shim (32) face a high pressure air flow side between two static interaction parts of the gas turbine.
3. 3. The gas turbine metal cloth seal structure according to claim 2, wherein the tooth profile cross section of the metal teeth in the left metal tooth profile shim (31) and the right metal tooth profile shim (32) is trapezoidal, and the adjacent tooth surface included angle is 60 °.
4. 4. The gas turbine metal cloth seal structure according to claim 2, wherein the left metal tooth form spacer (31) further extends to a side surface of the metal sheet (35), the upper flexible metal braid mesh (33) and the lower flexible metal braid mesh (34) with a non-tooth-form portion covering the side surface and is rounded at an edge thereof, and the right metal tooth form spacer (31) further extends to another side surface of the metal sheet (35), the upper flexible metal braid mesh (33) and the lower flexible metal braid mesh (34) with a non-tooth-form portion covering the side surface and is rounded at an edge thereof.
5. 5. The gas turbine metal cloth sealing structure according to claim 1, wherein the thickness of the metal sheet (35) is a, the thickness of the upper flexible metal woven mesh (33) is B, the thickness of the lower flexible metal woven mesh (34) is C, B is greater than or equal to 3A, and b=c.
6. 6. The gas turbine metal cloth seal structure of claim 5, wherein the foil a thickness is typically 0.5mm.
7. 7. The gas turbine metallic cloth seal structure as claimed in claim 1, wherein said upper flexible metallic woven mesh (33) and said lower flexible metallic woven mesh (34) are woven in a netherlands twill weave.
8. 8. The gas turbine metal cloth sealing structure according to claim 1, wherein the upper flexible metal woven mesh (33) and the metal sheet (35) and the lower flexible metal woven mesh (34) and the metal sheet (35) are connected by spot welding, and the upper flexible metal woven mesh (33) and the left metal tooth-shaped gasket (31) and the upper flexible metal woven mesh (33) and the right metal tooth-shaped gasket (32) are welded by brazing or laser.

Description

Gas turbine metal cloth sealing structure Technical Field The invention belongs to the technical field of gas turbine sealing, and particularly relates to a sealing structure for reducing gap leakage of static components of an air system. Background In modern gas turbine designs, to improve the maintainability and reliability of the components, a segmented manufacturing process is often employed, and due to such assembly and design factors, it is inevitable that certain gaps will be created between adjacent static components. In the working state of the gas turbine, the static parts still cannot be completely attached after expansion deformation, a certain gap exists, cold air on one side leaks into the main flow gas channel from the small gaps, and the generated leakage flow can cause the loss of the cold air of an air system, so that the overall performance of the gas turbine is reduced. At present, the conventional metal sealing sheet cannot meet the requirements of abrasion, leakage and the like when adjacent components are obviously moved in the axial direction and the radial direction due to manufacturing tolerance, assembly tolerance, vibration or thermal expansion. Bending of the metal sealing sheet is limited due to the high rigidity. Thus, under offset and mismatch conditions, the metal seal sheet cannot flex to close the gap between the sealing surface and the groove surface. Such a sealing sheet is only partially in contact with the groove surface, resulting in partial wear and thus reduced sealing performance. Therefore, a new solution is needed to solve the above-mentioned problems. Disclosure of Invention In order to solve the defects in the prior art, the invention discloses a metal cloth sealing structure of a gas turbine, which aims to solve the problem that a metal sealing sheet cannot be bent to effectively seal a gap between adjacent parts under the offset and mismatch conditions between the adjacent parts. A turbine metal cloth sealing structure of a gas turbine is used for being installed between two static interaction parts of the gas turbine and comprises a metal sheet, an upper flexible metal woven mesh covered on the upper surface of the metal sheet, a lower flexible metal woven mesh covered on the lower surface of the metal sheet, a left metal tooth-shaped gasket covered on the upper surface of the upper flexible metal woven mesh and a right metal tooth-shaped gasket covered on the upper surface of the lower flexible metal woven mesh, wherein the upper surfaces of the left metal tooth-shaped gasket and the right metal tooth-shaped gasket are provided with a plurality of projected parallel metal teeth, the sizes of the left metal tooth-shaped gasket and the right metal tooth-shaped gasket are completely the same, a gap is reserved between the left metal tooth-shaped gasket and the right metal tooth-shaped gasket, and the upper flexible metal woven mesh is exposed from the gap. As a further improvement of the present technique, the tooth flanks of the left and right metal tooth shims face the high pressure airflow side between the two static interaction components of the gas turbine. As a further improvement of the technology, the tooth-shaped cross sections of the metal teeth in the left metal tooth-shaped gasket and the right metal tooth-shaped gasket are trapezoid, and the included angle between adjacent tooth surfaces is 60 degrees. As a further improvement of the technology, the left metal tooth-shaped gasket extends to one side surface of the metal sheet, the upper flexible metal woven mesh and the lower flexible metal woven mesh to form a tooth-shaped part which covers the side surface, and the right metal tooth-shaped gasket extends to the other side surface of the metal sheet, the upper flexible metal woven mesh and the lower flexible metal woven mesh to form a tooth-shaped part which covers the side surface. As a further improvement of the technology, the thickness of the metal sheet is A, the thickness of the upper flexible metal woven mesh is B, the thickness of the lower flexible metal woven mesh is C, B is more than or equal to 3A, and B=C. As a further improvement of the present technique, the thickness of the foil A is typically taken to be 0.5mm. As a further improvement of the technology, the upper flexible metal woven mesh and the lower flexible metal woven mesh are woven in Dutch twill weave. As a further improvement of the technology, the upper flexible metal woven mesh cloth and the metal sheet and the lower flexible metal woven mesh cloth and the metal sheet are connected through spot welding, and the upper flexible metal woven mesh cloth and the left metal tooth-shaped gasket and the upper flexible metal woven mesh cloth and the right metal tooth-shaped gasket are welded through brazing or laser. Compared with the prior art, the invention has the beneficial effects that: 1. The invention focuses on reducing the leakage amount of cold air leaked through the g