Multi-layer soft sealing connection structure for gas turbine and exhaust volute
Through the design of the multi-layer soft seal structure, the poor sealing effect and thermal expansion problems in the hard sealing connection between the gas engine and the exhaust volute are solved, and efficient sealing and stable exhaust are achieved.
Patent Information
- Application Number
- CN202421840713.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The traditional hard sealing connection method between the gas engine and the exhaust volute has poor sealing effect and cannot absorb the axial thermal expansion during the operation of the gas engine, resulting in high-temperature flue gas leakage and deformation at the connection.
A multi-layer soft seal structure is adopted, including a sealing outer joint cover, a barrier ring, a sealing asbestos rope and a sealing plate. Through floating connection and multi-stage sealing design, the thermal expansion amount is absorbed, deformation is prevented, and a double-layer seal structure is formed.
The connection effect and exhaust stability of the combustion engine and exhaust volute are improved, and high-temperature flue gas is prevented from rushing out, and connection deformation caused by thermal expansion is avoided.
Smart Images
Figure CN223075626U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas turbine soft sealing, in particular to a multi-layer soft sealing connection structure between a gas turbine and an exhaust volute. Background Technique
[0002] During the operation of a gas turbine, a large amount of high-temperature flue gas is generated after the fuel burns at high temperature in the combustion chamber and is discharged through the exhaust volute connected to the gas turbine. In order to ensure the reliable operation of the unit with high efficiency, prevent the generated high-temperature flue gas from entering the gas turbine casing and triggering a high-temperature alarm, and prevent damage to the performance of the gas turbine, the connection between the gas turbine and the exhaust volute needs to be sealed.
[0003] There are at least the following problems in the prior art: The traditional exhaust volute is directly connected to the gas turbine through a hard sealing connection method, with poor sealing effect and inability to absorb the axial thermal expansion generated during the operation of the gas turbine. High-temperature deformation is likely to occur at the connection between the gas turbine and the exhaust volute, resulting in leakage of high-temperature flue gas. Content of the Utility Model
[0004] In view of the deficiencies of the prior art, the utility model develops a multi-layer soft sealing connection structure between a gas turbine and an exhaust volute. The utility model can not only seal and connect the gas turbine and the exhaust volute, but also avoid deformation caused by thermal expansion, effectively improving the connection effect between the gas turbine and the exhaust volute and the exhaust stability.
[0005] The technical solution for the utility model to solve the technical problem is: A multi-layer soft sealing connection structure between a gas turbine and an exhaust volute, including a gas turbine and an exhaust volute, further including a sealing outer connection cover. The intake end of the sealing outer connection cover is connected to the gas turbine through bolts, and the outlet end of the sealing outer connection cover is connected to the exhaust volute through a fixing ring. A number of groups of retaining rings are provided on the sealing outer connection cover, and at least one group of sealing asbestos ropes is provided between adjacent two groups of retaining rings. A sealing plate is provided on the outside of the retaining ring, and the sealing plate is connected to the exhaust volute through bolts.
[0006] As an optimization, a gap is provided between the sealing plate and the retaining ring. By setting the gap, it is convenient for the connection and installation of the gas turbine and the exhaust volute, compensates for the eccentric error within a certain dimensional range, and can also absorb the thermal expansion amount to prevent damage to parts caused by thermal deformation.
[0007] As an optimization, the retaining ring includes a first retaining ring, a second retaining ring and a third retaining ring, and the outer diameters of the first retaining ring, the second retaining ring and the third retaining ring are equal. By setting the first retaining ring, the second retaining ring and the third retaining ring, a double-layer sealing structure can be formed; by setting the equal outer diameters of the first retaining ring, the second retaining ring and the third retaining ring, it can prevent uneven force between the first retaining ring, the second retaining ring and the third retaining ring and the sealing plate, resulting in damage, and is also convenient for filling the sealing asbestos rope to achieve a good sealing effect.
[0008] As an optimization, the sealed asbestos rope includes a secondary sealed asbestos rope and a primary sealed asbestos rope. The secondary sealed asbestos rope is arranged between the first retaining ring and the second retaining ring, and the primary sealed asbestos rope is arranged between the second retaining ring and the third retaining ring. By providing the primary sealed asbestos rope and the secondary sealed asbestos rope, it can be filled between the first retaining ring, the second retaining ring and the third retaining ring, and cooperate with each other to form a double-layer sealing structure.
[0009] As an optimization, the outer diameter of the asbestos rope is larger than the inner diameter of the sealing plate. When the sealed outer connecting cover is pushed into the designated position of the exhaust volute, the sealing plate can squeeze the primary sealed asbestos rope and the secondary sealed asbestos rope, so that there is no gap between the primary sealed asbestos rope and the secondary sealed asbestos rope and the sealing plate, forming a seal to prevent high-temperature flue gas from escaping from the connection between the gas turbine and the exhaust volute, achieving a good sealing effect.
[0010] As an optimization, the diameter of the air outlet end of the sealed outer connecting cover is larger than the diameter of the fixing ring. It can float and fix the sealed outer connecting cover, further ensuring the sealing effect.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] By providing the sealed outer connecting cover and the fixing ring, the gas turbine and the exhaust volute can be connected, and it is a floating connection, so that the sealed outer connecting cover and the exhaust volute can produce relative sliding when heated and expanded, absorbing the axial thermal expansion amount and preventing thermal expansion deformation; by providing the retaining ring, the sealed asbestos rope and the sealing plate, a multi-stage seal can be formed to improve the sealing effect, and the sealing plate can press the asbestos rope tightly between the retaining rings, further improving the sealing effect and effectively preventing high-temperature flue gas from escaping from the connection. The utility model can not only seal and connect the gas turbine and the exhaust volute, but also avoid deformation caused by thermal expansion, effectively improving the connection effect between the gas turbine and the exhaust volute and the exhaust stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of an embodiment of the utility model.
[0014] In the figure: 1. Gas turbine; 2. Sealed outer connecting cover; 3. First retaining ring; 4. Secondary sealed asbestos rope; 5. Second retaining ring; 6. Sealing plate; 7. Primary sealed asbestos rope; 8. Exhaust volute; 9. Third retaining ring; 10. Fixing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] In order to clearly illustrate the technical features of the present solution, the utility model will be described in detail below through specific embodiments and in conjunction with its drawings.
[0016] Embodiment 1
[0017] Figure 1 It is an embodiment of the utility model, asFigure 1 As shown in the figure, a multi-layer soft-sealing connection structure between a gas turbine and an exhaust volute includes a gas turbine 1 and an exhaust volute 8, and also includes a sealing outer connecting cover 2. The intake end of the sealing outer connecting cover 2 is connected to the gas turbine 1 by bolts, and the outlet end of the sealing outer connecting cover 2 is floatingly connected to the exhaust volute 8 through a fixing ring 10. A number of groups of retaining rings are provided on the sealing outer connecting cover 2. At least one group of sealing asbestos ropes is provided between adjacent two groups of retaining rings. A sealing plate 6 is provided on the outer side of the retaining ring, and the sealing plate 6 is connected to the exhaust volute 8 by bolts.
[0018] By setting the sealing outer connecting cover 2 and the fixing ring 10, the gas turbine 1 and the exhaust volute 8 can be connected, and it is a floating connection, enabling the sealing outer connecting cover 2 and the exhaust volute 8 to have relative sliding when heated and expanded, absorbing the axial thermal expansion amount, and preventing thermal expansion deformation. By setting the retaining rings, the sealing asbestos ropes and the sealing plate 6, a multi-stage sealing can be formed to improve the sealing effect, and the sealing plate 6 can press the asbestos ropes between the retaining rings to further improve the sealing effect, effectively preventing high-temperature flue gas from escaping from the connection.
[0019] As Figure 1 shown in the figure, there is a gap between the sealing plate 6 and the retaining ring. By setting the gap, it is convenient for the connection and installation of the gas turbine 1 and the exhaust volute 8, compensating for the eccentric error within a certain dimensional range, and at the same time, it can also absorb the thermal expansion amount and prevent part damage caused by thermal deformation.
[0020] As Figure 1 shown in the figure, the retaining ring includes a first retaining ring 3, a second retaining ring 5 and a third retaining ring 9, and the outer diameters of the first retaining ring 3, the second retaining ring 5 and the third retaining ring 9 are equal. By setting the first retaining ring 3, the second retaining ring 5 and the third retaining ring 9, a double-layer sealing structure can be formed. By setting the equal outer diameters of the first retaining ring 3, the second retaining ring 5 and the third retaining ring 9, it can prevent uneven force between the first retaining ring 3, the second retaining ring 5 and the third retaining ring 9 and the sealing plate 6, resulting in damage, and at the same time, it is also convenient for filling the sealing asbestos ropes to achieve a good sealing effect.
[0021] As Figure 1 shown in the figure, the sealing asbestos ropes include a secondary sealing asbestos rope 4 and a primary sealing asbestos rope 7. The secondary sealing asbestos rope 4 is arranged between the first retaining ring 3 and the second retaining ring 5, and two groups of primary sealing asbestos ropes 7 are arranged between the second retaining ring 5 and the third retaining ring 9. By setting the primary sealing asbestos rope 7 and the secondary sealing asbestos rope 4, they can be filled between the first retaining ring 3, the second retaining ring 5 and the third retaining ring 9, and cooperate with each other to form a double-layer sealing structure.
[0022] As Figure 1As shown, the outer diameter of the asbestos rope is greater than the inner diameter of the sealing plate 6. When the sealed external connecting cover 2 is pushed into the designated position of the exhaust volute 8, the sealing plate 6 can squeeze the first-stage sealing asbestos rope 7 and the second-stage sealing asbestos rope 4, so that there is no gap between the first-stage sealing asbestos rope 7 and the second-stage sealing asbestos rope 4 and the sealing plate 6, forming a seal to prevent high-temperature flue gas from escaping from the connection between the gas turbine 1 and the exhaust volute 8, achieving a good sealing effect.
[0023] As Figure 1 shown, the diameter of the air outlet end of the sealed external connecting cover 2 is greater than the diameter of the fixed ring 10. It can float and fix the sealed external connecting cover 2 to further ensure the sealing effect.
[0024] During use, first push the sealed external connecting cover 2 into the designated position of the exhaust volute 8 and align it to reduce the eccentricity error; then fixedly connect the air inlet end of the sealed external connecting cover 2 to the gas turbine 1 with bolts, and then floatingly connect the air outlet end of the sealed external connecting cover 2 to the fixed ring 10; then fill two groups of first-stage sealing asbestos ropes 7 between the second retaining ring 5 and the third retaining ring 9, and fill the second-stage sealing asbestos rope 4 between the first retaining ring 3 and the second retaining ring 5. The utility model can not only seal and connect the gas turbine 1 and the exhaust volute 8, but also avoid deformation caused by thermal expansion, effectively improving the connection effect between the gas turbine 1 and the exhaust volute 8 and the exhaust stability.
[0025] During use, first install the sealing plate 6 on the exhaust volute 8 with bolts, and then push the sealed external connecting cover 2 into the designated position of the exhaust volute 8; then floatingly connect the air outlet end of the sealed external connecting cover 2 to the fixed ring 10; then fixedly connect the air inlet end of the sealed external connecting cover 2 to the gas turbine 1 with bolts and align it to reduce the eccentricity error; then fill two groups of first-stage sealing asbestos ropes 7 between the second retaining ring 5 and the third retaining ring 9 and the sealing plate 6 can squeeze the first-stage sealing asbestos rope 7, and fill the second-stage sealing asbestos rope 4 between the first retaining ring 3 and the second retaining ring 5 and the sealing plate 6 can squeeze the second-stage sealing asbestos rope 4 to complete the sealed connection. The utility model can not only achieve the sealed connection between the gas turbine 1 and the exhaust volute 8, but also avoid deformation caused by thermal expansion, effectively improving the connection effect between the gas turbine 1 and the exhaust volute 8 and the exhaust stability.
[0026] In the present utility model, the description of the orientation or relative position relationship of the structure, such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicates the orientation or relative position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model.
Claims
1. A multi-layer soft seal connection structure between a gas turbine and an exhaust volute, comprising a gas turbine (1) and an exhaust volute (8), characterized in that: It further includes a sealed external connection cover (2). The intake end of the sealed external connection cover (2) is connected to the gas turbine (1) by bolts, and the outlet end of the sealed external connection cover (2) is connected to the exhaust volute (8) through a fixing ring (10). A plurality of groups of retaining rings are provided on the sealed external connection cover (2), and at least one group of sealing asbestos ropes is provided between adjacent two groups of retaining rings. A sealing plate (6) is provided on the outer side of the retaining ring, and the sealing plate (6) is connected to the exhaust volute (8) by bolts.
2. The multi-layer soft seal connection structure between a gas turbine and an exhaust volute according to claim 1, wherein: A gap is provided between the sealing plate (6) and the retaining ring.
3. The multi-layer soft seal connection structure between the gas turbine and the exhaust volute according to claim 2, characterized in that: The retaining ring includes a first retaining ring (3), a second retaining ring (5) and a third retaining ring (9), and the outer diameters of the first retaining ring (3), the second retaining ring (5) and the third retaining ring (9) are equal.
4. The multi-layer soft seal connection structure of a gas turbine and an exhaust volute according to claim 3, characterized in that: The sealing asbestos rope includes a secondary sealing asbestos rope (4) and a primary sealing asbestos rope (7). The secondary sealing asbestos rope (4) is arranged between the first retaining ring (3) and the second retaining ring (5), and the primary sealing asbestos rope (7) is arranged between the second retaining ring (5) and the third retaining ring (9).
5. The multi-layer soft seal connection structure between the gas turbine and the exhaust volute according to any one of claims 1 to 4, characterized in that: The outer diameter of the asbestos rope is greater than the inner diameter of the sealing plate (6).
6. The multi-layer soft seal connection structure between a gas turbine and an exhaust volute according to claim 5, characterized in that: The diameter of the outlet end of the sealed external connection cover (2) is greater than the diameter of the fixing ring (10).