Edge plate sealing device, turbine rotor and turbine stator

Abstract

A margin plate sealing device, a turbine rotor and a turbine stator are used for improving the situation that the sealing effect is reduced due to radial dislocation of two margin plates. The margin plate sealing device comprises a bridging part and two inserting parts, the two inserting parts are used for being in inserting connection with the two sealing grooves which are opposite in the circumferential direction respectively, and the bridging part is in bridging connection with the two inserting parts and is elastically connected with each inserting part.

Description

Technical Field

[0001] The invention relates to aviation engine technology, and in particular to an edge plate sealing device, a turbine rotor and a turbine stator. Background Art

[0002] The turbine is one of the important parts of an aircraft engine. Increasing the temperature of the gas before the turbine is an effective measure to increase the thrust and power of the engine, but this seriously deteriorates the working environment of the turbine. In order to ensure the normal and reliable operation of turbine components such as blades, outer rings, and wheels, it is necessary to draw air with higher pressure and lower temperature from the compressor. Part of it is used to cool the high-temperature components to reduce their temperature level, and part of it is used to seal the turbine rotor and turbine stator to prevent gas backflow. Due to installation requirements, there is a circumferential installation gap between adjacent edge plates, which requires cold air sealing, but a large amount of sealing leakage is generated. The leakage of cold air is reduced by setting a sealing structure. Usually, two circumferentially opposite sealing grooves are set on the circumferential end faces of two circumferentially adjacent edge plates, and the sealing sheet is inserted into the two circumferentially opposite sealing grooves. The sealing sheet is a straight metal sheet. When the two edge plates are radially misaligned, the sealing sheet will bend and deform, resulting in a reduction in the sealing effect. In severe cases, the sealing sheet may even be sheared off. Summary of the invention

[0003] The object of the present invention is to provide an edge plate sealing device, a turbine rotor and a turbine stator, which are used to improve the situation where the radial misalignment of two edge plates reduces the sealing effect.

[0004] In a first aspect, the present invention provides an edge plate sealing device. According to an embodiment of the present invention, the edge plate sealing device includes a bridging portion and two plug-in portions. The two plug-in portions are used to respectively plug into two circumferentially opposite sealing grooves. The bridging portion bridges the two plug-in portions and is elastically connected to each of the plug-in portions.

[0005] In one or more embodiments, the plug-in portion includes a wavy portion, and the bridging portion includes a sheet portion, the sheet portion is connected to the wavy portion, and the thickness of the wavy portion is 0.5-0.8 times the thickness of the sheet portion.

[0006] In one or more embodiments, the plug-in portion includes a wave portion, and a height of the wave portion is smaller than a height of the sealing groove.

[0007] In one or more embodiments, the height of the wave portion is 0.8-0.95 times the height of the sealing groove.

[0008] In one or more embodiments, the wave portion is in the shape of a sine curve.

[0009] In one or more embodiments, the wave portion includes at least two wave crests and at least two wave troughs.

[0010] In a second aspect, the present invention provides a turbine rotor. According to an embodiment of the present invention, the turbine rotor includes two circumferentially adjacent edge plates and the above-mentioned edge plate sealing device, the two edge plates include two circumferentially opposite sealing grooves, and the two plug-in parts of the edge plate sealing device are respectively plugged into the two circumferentially opposite sealing grooves.

[0011] In a third aspect, the present invention provides a turbine stator. According to an embodiment of the present invention, the turbine stator includes two circumferentially adjacent edge plates and the above-mentioned edge plate sealing device, the two edge plates include two circumferentially opposite sealing grooves, and the two plug-in parts of the edge plate sealing device are respectively plugged into the two circumferentially opposite sealing grooves.

[0012] The embodiments of the present invention have at least the following beneficial effects:

[0013] The bridging part elastically connects the two plug-in parts. When the two edge plates are radially misaligned, the bridging part and / or the plug-in part elastically deform at the connection between the bridging part and the plug-in part, thereby preventing the edge plate sealing device from being irreversibly bent or sheared, thereby ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0015] Figure 1 is a cross-sectional view of the edge plate sealing device and two edge plates;

[0016] Figure 2 is a cross-sectional view of the edge plate sealing device and two edge plates;

[0017] Reference numerals:

[0018] 1- first edge plate;

[0019] 2- Second edge plate;

[0020] 3-Edge plate sealing device;

[0021] 4- the first sealing groove;

[0022] 5- Second sealing groove;

[0023] 6-first plug-in portion;

[0024] 7- second plug-in portion;

[0025] 8- bridging part;

[0026] 9- the top surface of the first sealing groove;

[0027] 10- bottom surface of the first sealing groove;

[0028] 11- Top surface of the second sealing groove

[0029] 12- bottom surface of the second sealing groove;

[0030] 13- wave part;

[0031] 14-piece department;

[0032] 15-peak;

[0033] 16-Trough. DETAILED DESCRIPTION

[0034] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations within the scope of the appended claims and their equivalents.

[0035] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0036] The terms "first", "second", etc. may be used interchangeably to distinguish one feature from another, and are not intended to mean that each feature must be located as shown in the figures in each embodiment.

[0037] Figure 1 The cross-sectional structure of the first edge plate 1, the second edge plate 2 and the edge plate sealing device 3 is shown. The first edge plate 1 and the second edge plate 2 can be the upper edge plate or the lower edge plate of the turbine rotor or the turbine stator adjacent in the circumferential direction.

[0038] like Figure 1 As shown, the first edge plate 1 is provided with a first sealing groove 4. The second edge plate 2 is provided with a second sealing groove 5. The first sealing groove 4 and the second sealing groove 5 are adjacent to each other in the circumferential direction, and the openings of the first sealing groove 4 and the second sealing groove 5 are opposite to each other in the circumferential direction. The cross section is perpendicular to the direction in which the first sealing groove 4 and the second sealing groove 5 extend.

[0039] like Figure 1As shown, the edge plate sealing device 3 extends in the direction in which the first sealing groove 4 and the second sealing groove 5 extend. The edge plate sealing device 3 includes a first plug-in portion 6 and a second plug-in portion 7. The first plug-in portion 6 is plugged into the first sealing groove 4 to seal the first sealing groove 4. The second plug-in portion 7 is plugged into the second sealing groove 5 to seal the second sealing groove 5. The edge plate sealing device 3 also includes a bridging portion 8. The bridging portion 8 bridges the first plug-in portion 6 and the second plug-in portion 7 to seal the circumferential gap between the first plug-in portion 6 and the second plug-in portion 7. One end of the bridging portion 8 is elastically connected to the first plug-in portion 6, and the other end of the bridging portion 8 is elastically connected to the second plug-in portion 7. As shown Figure 2 As shown, when the first edge plate 1 and the second edge plate 2 are radially misaligned, at the connection between the bridge portion 8 and the first plug-in portion 6, the bridge portion 8 and / or the first plug-in portion 6 are elastically deformed, and the center of the bridge portion 8 approximately rotates relative to the center of the first plug-in portion 6; at the connection between the bridge portion 8 and the second plug-in portion 7, the bridge portion 8 and / or the second plug-in portion 7 are elastically deformed, and the center of the bridge portion 8 approximately rotates relative to the center of the second plug-in portion 7, conforming to the radial misalignment of the first edge plate 1 and the second edge plate 2, avoiding irreversible bending deformation or shear damage of the edge plate sealing device 3, and ensuring the sealing effect.

[0040] The elastic connection between the bridge portion 8 and the first plug-in portion 6 and the second plug-in portion 7 can be achieved by material thickness distribution. Figure 1 As shown, at the connection between the bridge portion 8 and the first plug portion 6 and the second plug portion 7, the material thickness of the first plug portion 6 and the second plug portion 7 is less than the material thickness of the bridge portion 8, thereby achieving an elastic connection.

[0041] Continue to refer to Figure 1 , the first plug-in portion 6 and the second plug-in portion 7 may be a wave portion 13, which is a periodic, undulating curved plate. The wave portion 13 may undulate in a sinusoidal period. The bridge portion 8 may be a sheet portion 14, which is a flat plate. The sheet portion 14 may be located at the middle height of the wave portion 13. The wave portion 13 and the sheet portion 14 are made of the same material, and the thickness T2 of the wave portion 13 is 0.5-0.8 times the thickness T1 of the sheet portion 14. This allows the bridge portion 8 to form an elastic connection with the first plug-in portion 6 and the second plug-in portion 7. The edge plate sealing device 3 may be made of a metal plate. Compared with the edge plate sealing device in the form of a straight metal sheet, the height H1 of the wave portion 13 of the edge plate sealing device 3 is higher. In order to accommodate the wave portion 13, the height H2 of the first sealing groove 4 and the second sealing groove 5 is higher, thereby reducing the weight of the first edge plate 1 and the second edge plate 2.

[0042] Continue to refer to Figure 1 The height H1 of the wave portion 13 may be smaller than the height H2 of the first sealing groove 4 and the second sealing groove 5, so that the wave portion 13 may be smoothly inserted into the first sealing groove 4 and the second sealing groove 5 without jamming, which is convenient for installation.

[0043] Continue to refer to Figure 1 The height H1 of the wave portion 13 can be 0.8-0.95 times the height H2 of the first sealing groove 4 and the second sealing groove 5, so that the wave portion 13 always forms a comb seal on one side and a contact seal on the other side. Figure 1 In the figure, when the edge plate sealing device 3 is sealed, one side is filled with high temperature combustion gas, and the side where the high temperature combustion gas is located is marked "A". The flow velocity of the high temperature combustion gas is large, and under the action of the airflow pressure difference, the edge plate sealing device 3 is lifted up. The wave crest 15 of the wave portion 13 presses against the top surface 9 of the first sealing groove 4 and the top surface 11 of the second sealing groove 5 to form a contact seal. The wave trough 16 of the wave portion 13 leaves the bottom surface 10 of the first sealing groove 4 and the bottom surface 12 of the second sealing groove 5, with a small gap, forming a comb tooth seal. And in Figure 2 In the embodiment, the first edge plate 1 and the second edge plate 2 are radially offset, the wave crest 15 of the wave portion 13 of the first plug-in portion 6 presses against the top surface 9 of the first sealing groove 4 to form a contact seal, the wave trough 16 of the wave portion 13 of the first plug-in portion 6 has a small gap with the bottom surface 10 of the first sealing groove 4 to form a comb tooth seal, the wave crest 15 of the wave portion 13 of the second plug-in portion 7 has a small gap with the top surface 11 of the second sealing groove 5 to form a comb tooth seal, and the wave trough 16 of the wave portion 13 of the second plug-in portion 7 presses against the bottom surface 12 of the second sealing groove 5 to form a contact seal. If the height H1 of the wave portion 13 is less than 0.8 times the height H2 of the first sealing groove 4 and the second sealing groove 5, the wave portion 13 forms a contact seal on one side (wave crest 15 / wave trough 16), and has a large gap with the bottom surface / top surface of the sealing groove on the other side (wave trough 16 / wave crest 15), and cannot form a comb tooth seal, resulting in a poor sealing effect.

[0044] Continue to refer to Figure 1 The wave portion 13 may include at least two wave crests 15 and at least two wave troughs 16 to ensure the sealing effect of the formed comb teeth. The number of wave crests 15 and wave troughs 16 may be determined according to the depth L of the first sealing groove 4 and the second sealing groove 5.

[0045] Although the present invention is disclosed as above by the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A sealing device for edge plate, characterized in that include: Two plug-in parts, used for respectively plugging into two sealing grooves opposite to each other in the circumferential direction; as well as The bridging portion bridges the two plug-in portions and is elastically connected to each of the plug-in portions.

2. The edge plate sealing device according to claim 1, characterized in that: The plug-in portion includes a wave portion, and the bridging portion includes a sheet portion, the sheet portion is connected to the wave portion, and the thickness of the wave portion is 0.5-0.8 times the thickness of the sheet portion.

3. The edge plate sealing device according to claim 1, characterized in that: The plug-in portion includes a wave portion, and the height of the wave portion is smaller than the height of the sealing groove.

4. The edge plate sealing device according to claim 3, characterized in that: The height of the wave portion is 0.8-0.95 times the height of the sealing groove.

5. The edge plate sealing device according to claim 2 or 3, characterized in that: The shape of the wave portion is a sine curve.

6. The edge plate sealing device according to claim 4, characterized in that: The wave portion includes at least two wave crests and at least two wave troughs.

7. A turbine rotor, characterized in that include: Two circumferentially adjacent edge plates, the two edge plates comprising two circumferentially opposite sealing grooves; as well as The edge plate sealing device according to any one of claims 1 to 6, wherein the two plug-in parts of the edge plate sealing device are respectively plugged into the two circumferentially opposite sealing grooves.

8. A turbine stator, characterized in that include: Two circumferentially adjacent edge plates, the two edge plates comprising two circumferentially opposite sealing grooves; as well as The edge plate sealing device according to any one of claims 1 to 6, wherein the two plug-in parts of the edge plate sealing device are respectively plugged into the two circumferentially opposite sealing grooves.

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