Ground ring and gas turbine

Abstract

The invention provides a retaining ring and a gas turbine, and relates to the technical field of gas turbines.The retaining ring comprises at least two retaining ring body parts, the retaining ring body parts are sequentially connected end to end to form the annular retaining ring, and each retaining ring body part is provided with a first flow channel and a second flow channel and is constructed to be an arc-shaped piece extending in the circumferential direction of the retaining ring; the first flow channels and the second flow channels are arranged in the axial direction of the retaining ring and are suitable for introducing a cooling working medium, and the first flow channels and the second flow channels are arranged in the circumferential direction of the retaining ring at intervals; the first flow channel extends from the outer wall face of the retaining ring to the front edge and extends to the front edge, the second flow channel extends from the outer wall face of the retaining ring to the rear edge and extends to the rear edge, and the first flow channel and the second flow channel are both wavy flow channels. The heat exchange area can be increased through the wave-shaped cooling channels, the cooling and heat exchange effect is improved, the protection ring works in a reasonable temperature range, and the reliability of the protection ring is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, and in particular to a retaining ring and a gas turbine. Background Art

[0002] When using renewable energy sources such as wind and light to generate electricity, they are limited by their own randomness, intermittency and volatility, so they are not suitable for direct application in power systems. However, heavy-duty gas turbines can provide stable power output by consuming green hydrogen and green ammonia produced by renewable energy on a large scale. At the same time, due to their advantages such as good reliability, high efficiency and fast start and stop, they have become an important peak-shaving and backup energy system in the power system.

[0003] A heavy-duty gas turbine mainly includes three major components: a compressor, a combustion chamber, and a turbine. Among them, the core high-temperature components of the turbine components constitute the gas channel, which is composed of stationary blades, moving blades, and guard rings. The guard ring structure is installed radially above the moving blades, and its front and rear sides are the upper end walls of the stationary blades. In related technologies, when the heavy-duty gas turbine is working, the guard ring structure will be burned by the mainstream high-temperature gas (1300℃~900℃), and will also cause exciting forces due to the high-frequency rotation of the moving blades. Therefore, it is necessary to improve the reliability of the guard ring structure to ensure the safe operation of the gas turbine. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of one aspect of the present invention provides a guard ring, which can increase the heat exchange area through a corrugated cooling channel, improve the cooling and heat exchange effect, and make the guard ring work within a reasonable temperature range to ensure the reliability of the guard ring.

[0006] Another aspect of the present invention provides a gas turbine.

[0007] A guard ring according to an embodiment of the present invention includes a guard ring body, at least two of which are connected end to end to form an annular guard ring. The guard ring body has a first flow channel and a second flow channel and is constructed as an arc-shaped member extending along the circumference of the guard ring. The first flow channel and the second flow channel are arranged along the axial direction of the guard ring and are both suitable for passing cooling medium. There are multiple first flow channels and multiple second flow channels and they are arranged at intervals along the circumference of the guard ring. The first flow channel extends from the outer wall surface of the guard ring toward the leading edge and extends to the leading edge, and the second flow channel extends from the outer wall surface of the guard ring toward the trailing edge and extends to the trailing edge. The first flow channel and the second flow channel are both wavy flow channels.

[0008] According to the guard ring of the embodiment of the present invention, the guard ring structure is formed by connecting the guard ring body parts in sequence, and the multiple first flow channels on the guard ring body part can cover the part of the guard ring body part adjacent to the guard ring front edge, and the multiple second flow channels can cover the part of the guard ring body part adjacent to the guard ring rear edge. At the same time, because the first flow channel and the second flow channel are both wavy flow channels, that is, both extend in the guard ring body part in a wavy structure, the contact area between the first flow channel and the second flow channel and the guard ring body part can be effectively increased. Therefore, when the cooling medium is introduced into the first flow channel and the second flow channel, the cooling medium can be used to complete good flow heat exchange for the entire guard ring body part, thereby ensuring that the guard ring can work reliably in a high-temperature gas environment. Compared with the related art, the present invention can increase the heat exchange area and improve the cooling and heat exchange effect through the wavy cooling channel, so that the guard ring can work within a reasonable temperature range to ensure the reliability of the guard ring.

[0009] In some embodiments, an inlet of each of the first flow channel and the second flow channel is formed on the outer wall surface of the guard ring, and on a radial projection surface perpendicular to the guard ring, a projection of the inlet of the first flow channel is located between projections of any two adjacent second flow channels.

[0010] In some embodiments, on a projection plane perpendicular to the axial direction of the guard ring, the shortest distance between the center of the projection of the first flow channel and the central axis of the guard ring is equal to the shortest distance between the center of the projection of the second flow channel and the central axis of the guard ring.

[0011] In some embodiments, a distance from a leading edge to a trailing edge of the guard ring is defined as B, and a distance from an inlet of each of the first flow channel and the second flow channel to a leading edge of the guard ring is defined as b, wherein 0.2B≤b≤0.5B.

[0012] In some embodiments, the guard ring body is provided with a first cooling zone and a second cooling zone connected to each other, the first cooling zone is provided with the first flow channel and the second flow channel, and there are two second cooling zones which are respectively provided on both sides of the first cooling zone along the circumference of the guard ring;

[0013] The guard ring body also has a first end face and a second end face arranged opposite to each other along the circumference of the guard ring, and each of the second cooling zones is provided with a plurality of third flow channels, which are arranged at intervals along the axial direction of the guard ring and are suitable for passing cooling medium, and the third flow channels extend in a direction from the outer wall surface of the guard ring toward any one of the first end face and the second end face of the guard ring body and extend to the corresponding end face.

[0014] In some embodiments, the inlets of all the third flow channels are formed on the outer wall surface of the guard ring and are located at the connection between the first cooling zone and the second cooling zone. On the radial projection surface perpendicular to the guard ring, the projections of multiple third flow channels are divergent in the second cooling zone, so that multiple third flow channels cover the second cooling zone.

[0015] In some embodiments, each of the first flow channel and the second flow channel is closer to the inner wall surface of the guard ring than the third flow channel.

[0016] In some embodiments, the retaining ring further comprises a sealing assembly, the sealing assembly being mounted on the retaining ring body, the sealing assembly being at least two and corresponding to the retaining ring body one by one, all the sealing assemblies being connected end to end in sequence along the circumference of the retaining ring, and an accommodating cavity for accommodating the retaining ring body being formed around any two adjacent sealing assemblies to form an annular seal on the circumference of the retaining ring body;

[0017] Each of the first flow channel, the second flow channel, and the third flow channel is closer to the inner wall surface of the grommet than the sealing assembly.

[0018] In some embodiments, the sealing assembly includes a first sealing sheet, a second sealing sheet, and a third sealing sheet connected in sequence, one of the first sealing sheet and the third sealing sheet is located at the front edge of the guard ring, and the other is located at the rear edge of the guard ring, and the second sealing sheet is located at the connection between any two adjacent guard ring body parts, and any sealing assembly and the second sealing sheet of the adjacent sealing assembly together surround the accommodating cavity.

[0019] In some embodiments, a first seam is formed between the first sealing sheet and the second sealing sheet, a second seam is formed between the second sealing sheet and the third sealing sheet, and at least one of the first seam and the second seam may be one of a serrated seam, a stepped seam, and a wavy seam.

[0020] In some embodiments, the outer wall surface of the guard ring body is provided with a first hook portion and a second hook portion, and the first hook portion and the second hook portion are both suitable for being connected to a holding ring, and the first hook portion and the second hook portion are arranged at intervals along the axial direction of the guard ring and together with the guard ring body form a groove.

[0021] In some embodiments, the first hook portion is closer to the front edge of the guard ring than the second hook portion, and the first hook portion and the second hook portion are each provided with at least two main hooks, and all the main hooks of each of the first hook portion and the second hook portion are arranged at intervals along the circumference of the guard ring, and an auxiliary hook is further provided between any two adjacent main hooks in the first hook portion, and the auxiliary hook is spaced apart from the adjacent main hooks along the circumference of the guard ring.

[0022] In some embodiments, the main hook and the auxiliary hook both extend along the circumference of the guard ring, the arc length of the guard ring body is L, and the length of the main hook is l 1 , l 1 ≥0.25L.

[0023] In some embodiments, the length of the auxiliary hook is l 2 , 0.125L≤l 2 ≤0.2L.

[0024] A gas turbine according to an embodiment of the present invention comprises the guard ring described in any one of the above embodiments.

[0025] The technical advantages of the gas turbine according to the embodiment of the present invention are the same as the technical advantages of the above-mentioned retaining ring, which will not be described in detail here.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a guard ring according to an embodiment of the present invention.

[0028] Figure 2 Schematic diagram of the connection structure of two guard ring main bodies in a guard ring according to an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the structure of the guard ring body in the guard ring according to an embodiment of the present invention.

[0030] Figure 4 1 is a perspective structural diagram of a guard ring body in a guard ring according to an embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the exploded structure of the retaining ring body and the sealing assembly in the retaining ring according to an embodiment of the present invention.

[0032] Figure 6 Schematic diagram of the connection structure of two sealing components in a retaining ring according to an embodiment of the present invention.

[0033] Figure 7 Schematic diagram of the connection structure of the guard ring body, the first sealing sheet and the second sealing sheet in the guard ring according to an embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the connection structure of the guard ring body, the second sealing sheet and the third sealing sheet in the guard ring according to an embodiment of the present invention.

[0035] Fig. 9 Schematic diagram of a numerical analysis unit of a guard ring according to an embodiment of the present invention.

[0036] Fig.10 yes Fig. 9 Temperature distribution diagram of metal wall temperature on the gas side.

[0037] Fig.11 It is a temperature distribution diagram of the metal wall temperature on the gas side when the guard ring adopts an impact cooling structure in the related technology.

[0038] Figure numerals: 1. guard ring body, 11. first flow channel, 12. second flow channel, 13. outer wall surface of the guard ring, 14. leading edge, 15. trailing edge, 16. first cooling zone, 17. second cooling zone, 171. third flow channel, 18. first end surface, 19. second end surface, 191. inner wall surface of the guard ring, 2. sealing assembly, 21. accommodating cavity, 22. first sealing sheet, 23. second sealing sheet, 24. third sealing sheet, 25. first seam, 26. second seam, 3. first hook portion, 31. main hook, 32. auxiliary hook, 4. second hook portion. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] like Figures 1 to 4 As shown, a guard ring of an embodiment of the present invention includes a guard ring body 1, at least two guard ring body parts 1, all of the guard ring body parts 1 are connected in sequence end to end to form an annular guard ring, the guard ring body 1 has a first flow channel 11 and a second flow channel 12 and is constructed as an arc-shaped member extending along the circumference of the guard ring, the first flow channel 11 and the second flow channel 12 are arranged along the axial direction of the guard ring and are both suitable for passing cooling medium, there are multiple first flow channels 11 and second flow channels 12 and they are arranged at intervals along the circumference of the guard ring; the first flow channel 11 extends from the outer wall surface 13 of the guard ring toward the leading edge 14 and extends to the leading edge 14, the second flow channel 12 extends from the outer wall surface 13 of the guard ring toward the trailing edge 15 and extends to the trailing edge 15, and the first flow channel 11 and the second flow channel 12 are both wavy flow channels.

[0041] It can be understood that the retaining ring according to the embodiment of the present invention is formed by connecting the retaining ring body parts 1 in sequence to form a retaining ring structure, and the multiple first flow channels 11 on the retaining ring body part 1 can cover the portion of the retaining ring body part 1 adjacent to the retaining ring front edge 14, and the multiple second flow channels 12 can cover the portion of the retaining ring body part 1 adjacent to the retaining ring rear edge 15. At the same time, because the first flow channel 11 and the second flow channel 12 are both wavy flow channels, that is, both extend in the retaining ring body part 1 in a wavy structure, the contact area between the first flow channel 11 and the second flow channel 12 and the retaining ring body part 1 can be effectively increased. Therefore, when the cooling medium is introduced into the first flow channel 11 and the second flow channel 12, the cooling medium can be used to complete good flow heat exchange for the entire retaining ring body part 1, thereby ensuring that the retaining ring can work reliably in a high-temperature gas environment. Compared with the related art, the present invention can increase the heat exchange area and improve the cooling and heat exchange effect through the wavy cooling channel, so that the retaining ring can work within a reasonable temperature range to ensure the reliability of the retaining ring.

[0042] Specifically, the cooling medium is not limited to cooling air. Multiple first flow channels 11 can be arranged at equal or unequal intervals along the circumference of the guard ring; multiple second flow channels 12 can be arranged at equal or unequal intervals along the circumference of the guard ring. Preferably, the number of first flow channels 11 and second flow channels 12 is the same, and the spacing between any two adjacent first flow channels 11 is the same or similar to the spacing between any two adjacent second flow channels 12, so that the cooling effect of the guard ring body 1 is uniform, the temperature gradient and thermal stress are reduced, and the safety and reliability of the guard ring during operation are further improved. The outer wall surface 13 of the guard ring is also the wall surface of the guard ring away from the gas side channel. Both the first flow channel 11 and the second flow channel 12 can be wavy flow channels extending along the axial direction of the guard ring.

[0043] like Figure 3 and Figure 4 As shown, in some embodiments, the inlet of each of the first flow channel 11 and the second flow channel 12 is formed on the outer wall surface 13 of the guard ring, and on the radial projection surface perpendicular to the guard ring, the projection of the inlet of the first flow channel 11 is located between the projections of any two adjacent second flow channels 12, so that the first flow channel 11 and the second flow channel 12 can cooperate to cover the guard ring body 1 to the greatest extent, thereby ensuring the cooling and heat exchange effect on the guard ring body 1.

[0044] Specifically, the inlet of the first flow channel 11 and the inlet of the second flow channel 12 can both be opened on the outer wall surface 13 of the guard ring (that is, the cold air side of the guard ring). The outlet of the first flow channel 11 is opened on the front edge 14 of the guard ring to communicate with the outside world. The outlet of the second flow channel 12 is opened on the rear edge 15 of the guard ring to communicate with the outside world. Preferably, on the radial projection surface perpendicular to the guard ring, the projection of the inlet of the first flow channel 11 is flush with the projection of the inlet of any two adjacent second flow channels 12, so that the cooling medium can be introduced into the first flow channel 11 and the second flow channel 12 through the outer wall surface 13 of the guard ring, while ensuring the cooling and heat exchange effect of the guard ring body 1, simplifying the overall structure of the guard ring body 1, and reducing the difficulty of production and operation of introducing cooling medium into the guard ring body 1.

[0045] like Figure 3 and Figure 4 As shown, in some embodiments, on the axial projection plane perpendicular to the guard ring, the shortest distance between the center of the projection of the first flow channel 11 and the central axis of the guard ring is equal to the shortest distance between the center of the projection of the second flow channel 12 and the central axis of the guard ring, that is, the distance from the first flow channel 11 to the inner wall surface 191 of the guard ring is equal to the distance from the second flow channel 12 to the inner wall surface 191 of the guard ring, so as to further ensure the uniformity of the cooling effect on the guard ring body 1.

[0046] like Figure 3 and Figure 4 As shown, in some embodiments, the distance from the leading edge 14 to the trailing edge 15 of the guard ring is defined as B, and the distance from the entrance of each of the first flow channel 11 and the second flow channel 12 to the leading edge 14 of the guard ring is b, wherein 0.2B≤b≤0.5B, so as to select reasonable entrance positions of the first flow channel 11 and the second flow channel 12, adjust the lengths of the two, control the flow rate of cold air flowing to the leading edge 14 and the trailing edge 15 of the guard ring, and realize safe and reliable operation of the guard ring body 1 at a high gas side temperature by a low amount of cold air.

[0047] It should be noted that in the design process of gas turbines, the amount of cooling air for components is a key indicator, and the main task of cooling design is to achieve safe and reliable operation of components at high gas side temperatures through low cooling air volume. The back pressure of the leading edge 14 of the guard ring is higher than the back pressure of the trailing edge of the guard ring. When the pressure of the incoming cooling air is fixed, the lower the back pressure, the greater the amount of cooling air allocated to the flow channel (first flow channel 11 and second flow channel 12) when the geometric dimensions (length, cross-sectional area, etc.) of the flow channel (first flow channel 11 and second flow channel 12) are fixed. If it is ensured that the leading edge 14 of the guard ring can obtain sufficient cooling air, and the dimensions such as the flow channel spacing and cross-sectional area are kept within a reasonable range, and the number and spacing of the first flow channel 11 and the second flow channel 12 are the same or similar, the cooling effect of the guard ring body 1 can be uniform, the temperature gradient is low, the thermal stress is low, and safe and reliable operation is guaranteed.

[0048] like Figure 4As shown, in some embodiments, the guard ring body 1 is provided with a first cooling zone 16 and a second cooling zone 17 connected to each other, the first cooling zone 16 is provided with a first flow channel 11 and a second flow channel 12, and there are two second cooling zones 17 which are respectively provided on both sides of the first cooling zone 16 along the circumference of the guard ring.

[0049] The guard ring body 1 also has a first end face 18 and a second end face 19 arranged opposite to each other along the circumference of the guard ring. Each second cooling zone 17 is provided with a plurality of third flow channels 171. The plurality of third flow channels 171 are arranged at intervals along the axial direction of the guard ring and are suitable for passing cooling medium. The third flow channels 171 extend in a direction from the outer wall surface 13 of the guard ring toward any one of the first end face 18 and the second end face 19 of the guard ring body 1 and extend to the corresponding end face.

[0050] It can be understood that the first flow channel 11 and the second flow channel 12 can cool and exchange heat for the middle of the guard ring body 1, and the leading edge 14 and the trailing edge 15 of the guard ring, while the third flow channel 171 can cool and exchange heat for both sides of the guard ring body 1 along the circumference of the guard ring, so as to achieve cooling of the entire guard ring body 1 and ensure that the guard ring can work reliably in a high-temperature gas environment.

[0051] like Figure 4 As shown, in some embodiments, the inlets of all third flow channels 171 are formed on the outer wall surface 13 of the guard ring and are located at the connection between the first cooling zone 16 and the second cooling zone 17. On the radial projection surface perpendicular to the guard ring, the projections of the plurality of third flow channels 171 are divergent in the second cooling zone 17, that is, the third flow channels 171 extend obliquely from the connection between the first cooling zone 16 and the second cooling zone 17 toward the corresponding end surface of the guard ring body 1, so that the plurality of third flow channels 171 cover the second cooling zone 17.

[0052] It can be understood that designing multiple third flow channels 171 to be arranged in a divergent manner can form a maximum cooling coverage area on the side of the guard ring body 1, which helps to ensure uniform cooling effect on the side of the guard ring body 1, low temperature gradient, reduced local thermal stress, and improved working reliability of the guard ring body 1.

[0053] Specifically, the inlet of the third flow channel 171 can be provided on the outer wall surface 13 of the guard ring. The outlet of the third flow channel 171 can be provided on the first end surface 18 or the second end surface 19 of the guard ring to communicate with the outside. Preferably, the inlets of all the third flow channels 171 in each second cooling zone 17 are flush, and the spacing between the outlets of any two adjacent third flow channels 171 in each second cooling zone 17 is equal, that is, the outlets of all the third flow channels 171 in each second cooling zone 17 are arranged at equal intervals along the axial direction of the guard ring, so as to facilitate the introduction of cooling medium into the third flow channels 171 through the outer wall surface 13 of the guard ring, further simplifying the overall structure of the guard ring body 1, and reducing the difficulty of production and the operation of introducing cooling medium into the guard ring body 1.

[0054] like Figure 3 and Figure 4 As shown, in some embodiments, each of the first flow channel 11 and the second flow channel 12 is closer to the inner wall surface 191 of the guard ring than the third flow channel 171, that is, the first flow channel 11 and the second flow channel 12 are closer to the gas channel than the third flow channel 171 in the radial direction of the guard ring, further ensuring the cooling and heat exchange effect on the guard ring body 1.

[0055] like Figures 4 to 6 As shown, in some embodiments, the guard ring further includes a sealing component 2, which is installed on the guard ring body 1. There are at least two sealing components 2 and they correspond one to one with the guard ring body 1. All sealing components 2 are connected end to end in sequence along the circumference of the guard ring, and any two adjacent sealing components 2 are commonly surrounded by a receiving cavity 21 for accommodating the guard ring body 1, so as to form an annular seal on the circumference of the guard ring body 1.

[0056] Each of the first flow channel 11 , the second flow channel 12 , and the third flow channel 171 is closer to the inner wall surface 191 of the grommet than the sealing assembly 2 .

[0057] It can be understood that the sealing assembly 2 forms an annular sealing structure around the entire circumference of each guard ring body 1. Compared with the related art, the sealing structure in the present invention further reduces the amount of leaked cooling air, which can improve the power output of the gas turbine. At the same time, because the first flow channel 11, the second flow channel 12 and the third flow channel 171 are closer to the gas channel of the guard ring than the sealing assembly 2, effective cold air covering protection can be formed between the sealing assembly 2 and the gas channel, further ensuring the working safety and reliability of the sealing assembly 2.

[0058] like Figure 5 and Figure 6 As shown, in some embodiments, the sealing assembly 2 includes a first sealing sheet 22, a second sealing sheet 23 and a third sealing sheet 24 connected in sequence, one of the first sealing sheet 22 and the third sealing sheet 24 is located at the front edge 14 of the guard ring, and the other is located at the rear edge 15 of the guard ring, and the second sealing sheet 23 is located at the connection between any two adjacent guard ring body parts 1. Any sealing assembly 2 and the second sealing sheet 23 of the adjacent sealing assembly 2 are together surrounded by a receiving cavity 21 to ensure the sealing performance of the guard ring while further simplifying the overall sealing structure of the guard ring.

[0059] Specifically, the front edge 14, the rear edge 15, the first end face 18 and the second end face 19 of the guard ring can be provided with mounting grooves. The front edge 14 and the rear edge 15 of the guard ring both extend in the circumferential direction of the guard ring, and the first end face 18 and the second end face 19 of the guard ring both extend in the axial direction of the guard ring. The mounting groove can extend in accordance with the shape at the corresponding position (i.e., the front edge 14, the rear edge 15, the first end face 18 or the second end face 19 of the guard ring). The first sealing sheet 22, the second sealing sheet 23 and the third sealing sheet 24 can all fit in the mounting grooves.

[0060] like Figure 7 and Figure 8 As shown, in some embodiments, a first seam 25 is formed between the first sealing sheet 22 and the second sealing sheet 23, and a second seam 26 is formed between the second sealing sheet 23 and the third sealing sheet 24. At least one of the first seam 25 and the second seam 26 may be a serrated seam, a stepped seam, and a wavy seam, so as to further increase the contact area between the connected sealing sheets (i.e., between the first sealing sheet 22 and the second sealing sheet 23, or between the second sealing sheet 23 and the third sealing sheet 24), ensure the connection reliability between the two, and at the same time reduce the amount of leaked cold air and improve the sealing performance of the protective ring.

[0061] Specifically, taking the figure as an example, the first sealing sheet 22 and the second sealing sheet 23, as well as the second sealing sheet 23 and the third sealing sheet 24 are installed by concave-convex tooth engagement, wherein grooves can be opened on the first sealing sheet 22 and the third sealing sheet 24, and a convex tooth platform can be formed on the second sealing sheet 23.

[0062] like Figure 3 and Figure 4 As shown, in some embodiments, the outer wall surface of the guard ring body 1 is provided with a first hook portion 3 and a second hook portion 4, both of which are suitable for being connected with the holding ring, and the first hook portion 3 and the second hook portion 4 are arranged at intervals along the axial direction of the guard ring and together with the guard ring body 1 form a groove.

[0063] It can be understood that the first hook portion 3 and the second hook portion 4 can provide sufficient installation support and contact friction between the guard ring body portion 1 and the holding ring, provide axial, radial and circumferential constraints for the guard ring, and smooth out the exciting force caused by the high-speed rotation of the moving blades during the reignition process.

[0064] like Figure 3 and Figure 4As shown, in some embodiments, the first hook portion 3 is closer to the front edge 14 of the guard ring than the second hook portion 4, and the first hook portion 3 and the second hook portion 4 are each provided with at least two main hooks 31, and all the main hooks 31 of each of the first hook portion 3 and the second hook portion 4 are arranged at intervals along the circumference of the guard ring, and an auxiliary hook 32 is further provided between any two adjacent main hooks 31 in the first hook portion 3, and the auxiliary hook 32 is spaced apart from the adjacent main hooks 31 along the circumference of the guard ring.

[0065] It can be understood that there is a gap between two adjacent main hooks 31, or between adjacent main hooks 31 and auxiliary hooks 32 in the circumferential direction of the guard ring, so that the first hook portion 3 and the second hook portion 4 can avoid the stress concentration problem caused by uneven circumferential thermal expansion caused by the radial temperature gradient. At the same time, the circumferential discontinuity structure also allows cold air to flow into the leading edge 14 and the trailing edge 15 of the guard ring to form a cooling chamber between the stationary blade end wall structure adjacent to the guard ring to avoid gas intrusion.

[0066] Specifically, the first hook portion 3 and the second hook portion 4 may both protrude from the inner wall surface of the groove toward the outer wall surface, that is, the hook body of the first hook portion 3 faces the front edge 14 side of the guard ring, and the hook body of the second hook portion 4 faces the rear edge 15 side of the guard ring. Taking the figure as an example, the first hook portion 3 may include a main hook 31, an auxiliary hook 32, and a main hook 31 arranged at intervals along the circumference of the guard ring, and the second hook portion 4 may include three main hooks 31 arranged at intervals along the circumference of the guard ring.

[0067] like Figure 3 and Figure 4 As shown, in some embodiments, the main hook 31 and the auxiliary hook 32 both extend along the circumference of the guard ring, the arc length of the guard ring body 1 is L, and the length of the main hook 31 is l 1 , l 1 ≥0.25L, the length of the auxiliary hook 32 is l 2 , 0.125L≤l 2 ≤0.2L.

[0068] It can be understood that the main hook 31 and the auxiliary hook 32 are designed within the above-mentioned arc length range to ensure sufficient contact between the guard ring and the holding ring, and the friction resistance brought by the pre-tightening force is sufficient to ensure that the guard ring is fully fixed in the circumferential and radial directions, avoiding component damage caused by pneumatic excitation force.

[0069] A gas turbine (not shown in the figure) according to an embodiment of the present invention comprises a guard ring of any one of the above embodiments.

[0070] The technical advantages of the gas turbine according to the embodiment of the present invention are the same as the technical advantages of the above-mentioned retaining ring, which will not be described in detail here.

[0071] It should be noted that the retaining ring in the present invention adopts the above-mentioned structure and can be applied to the turbine of heavy-duty gas turbines with a power of 300MW and above, and can also be applied to the turbine of small industrial gas turbines through modular design. The present invention can reduce the temperature of the retaining ring under the same cooling air volume conditions, improve the reliability of the retaining ring, and ensure that the gas turbine can operate more safely.

[0072] By performing numerical calculations on the guard ring structure proposed in the present invention and the impingement cooling gas turbine turbine guard ring structure in the related art, it is calculated that under similar gas working conditions and the same cooling air volume, the gas side metal wall temperature of the corrugated microchannel (i.e., the first flow channel and the second flow channel) cooling structure of the guard ring proposed in the present invention can be reduced by 60 to 100°C compared with the impingement cooling structure in the related art. According to design experience, the gas turbine turbine inlet temperature can be increased by 100°C. Assuming that the reliability of other components such as the combustion chamber, turbine moving and stationary blades, etc. can be guaranteed and other conditions remain unchanged, the turbine inlet temperature is increased by 100°C, which can increase the combined cycle efficiency by 1.0%, thereby improving the economy of power generation in the gas turbine combined cycle power station.

[0073] In addition, under the conditions of similar gas operation and the same cooling air volume, based on Fig. 9 The numerical analysis unit of the guard ring shown in the figure analyzes the temperature distribution of the metal wall on the gas side, and the following can be obtained: Fig.10 The temperature distribution diagram of the metal wall temperature on the gas side when the guard ring adopts a corrugated microchannel cooling structure in the present invention is shown, and Fig.11 By comparing the temperature distribution diagram of the metal wall temperature on the gas side of the guard ring when the impingement cooling structure is adopted in the related art shown, it can be seen that the temperature distribution of the metal wall temperature on the gas side of the guard ring in the present invention is more uniform than the temperature distribution of the metal wall temperature on the gas side of the guard ring in the related art, and the overall temperature of the metal wall temperature on the gas side of the guard ring in the present invention is lower than the metal wall temperature on the gas side of the guard ring in the related art. Therefore, under the condition of the same cooling air volume, the present invention can effectively reduce the temperature of the guard ring, improve the reliability of the guard ring, and ensure that the gas turbine can operate more safely.

[0074] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0078] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A retaining ring, characterized in that: The invention comprises a guard ring body part, wherein the guard ring body parts are at least two, and all the guard ring body parts are connected end to end in sequence to form an annular guard ring, wherein the guard ring body part has a first flow channel and a second flow channel and is configured as an arc-shaped part extending along the circumference of the guard ring, wherein the first flow channel and the second flow channel are arranged along the axial direction of the guard ring and are both suitable for passing a cooling medium, and wherein the first flow channel and the second flow channel are both provided in plurality and are arranged at intervals along the circumference of the guard ring; The first flow channel extends from the outer wall surface of the guard ring toward the leading edge and to the leading edge, and the second flow channel extends from the outer wall surface of the guard ring toward the trailing edge and to the trailing edge. Both the first flow channel and the second flow channel are wavy flow channels.

2. The retaining ring according to claim 1, characterized in that: The inlet of each of the first flow channel and the second flow channel is formed on the outer wall surface of the guard ring, and on the projection surface perpendicular to the radial direction of the guard ring, the projection of the inlet of the first flow channel is located between any two adjacent projections of the second flow channels; And / or, on a projection plane perpendicular to the axial direction of the guard ring, the shortest distance between the center of the projection of the first flow channel and the central axis of the guard ring is equal to the shortest distance between the center of the projection of the second flow channel and the central axis of the guard ring.

3. The retaining ring according to claim 2, characterized in that: The distance from the leading edge to the trailing edge of the guard ring is defined as B, and the distance from the entrance of each of the first flow channel and the second flow channel to the leading edge of the guard ring is defined as b, wherein 0.2B≤b≤0.5B.

4. The retaining ring according to any one of claims 1 to 3, characterized in that: The guard ring body is provided with a first cooling zone and a second cooling zone connected to each other, the first cooling zone is provided with the first flow channel and the second flow channel, and there are two second cooling zones which are respectively provided on both sides of the first cooling zone along the circumference of the guard ring; The guard ring body also has a first end face and a second end face arranged opposite to each other along the circumference of the guard ring, and each of the second cooling zones is provided with a plurality of third flow channels, which are arranged at intervals along the axial direction of the guard ring and are suitable for passing cooling medium, and the third flow channels extend in a direction from the outer wall surface of the guard ring toward any one of the first end face and the second end face of the guard ring body and extend to the corresponding end face.

5. The retaining ring according to claim 4, characterized in that: The inlets of all the third flow channels are formed on the outer wall surface of the guard ring and are located at the connection between the first cooling zone and the second cooling zone. On the radial projection surface perpendicular to the guard ring, the projections of the plurality of third flow channels diverge in the second cooling zone, so that the plurality of third flow channels cover the second cooling zone. And / or, each of the first flow channel and the second flow channel is closer to the inner wall surface of the guard ring than the third flow channel.

6. The retaining ring according to claim 5, characterized in that: It also includes a sealing assembly, which is mounted on the guard ring body. There are at least two sealing assemblies, which correspond to the guard ring body one by one. All the sealing assemblies are connected end to end in sequence along the circumference of the guard ring. Any two adjacent sealing assemblies are surrounded by a receiving cavity for receiving the guard ring body, so as to form an annular seal on the circumference of the guard ring body. Each of the first flow channel, the second flow channel, and the third flow channel is closer to the inner wall surface of the grommet than the sealing assembly.

7. The retaining ring according to claim 6, characterized in that: The sealing assembly comprises a first sealing sheet, a second sealing sheet and a third sealing sheet connected in sequence, one of the first sealing sheet and the third sealing sheet is located at the front edge of the guard ring, and the other is located at the rear edge of the guard ring, the second sealing sheet is located at the connection between any two adjacent guard ring body parts, and any sealing assembly and the second sealing sheet of the adjacent sealing assembly together surround the accommodating cavity; And / or, a first seam is formed between the first sealing sheet and the second sealing sheet, a second seam is formed between the second sealing sheet and the third sealing sheet, and at least one of the first seam and the second seam may be one of a serrated seam, a stepped seam and a wavy seam.

8. The retaining ring according to claim 1, characterized in that: The outer wall surface of the guard ring body is provided with a first hook portion and a second hook portion, both of which are suitable for being connected to a holding ring, and the first hook portion and the second hook portion are arranged at intervals along the axial direction of the guard ring and together with the guard ring body form a groove. And / or, the first hook portion is closer to the front edge of the guard ring than the second hook portion, the first hook portion and the second hook portion are each provided with at least two main hooks, all the main hooks of each of the first hook portion and the second hook portion are arranged at intervals along the circumference of the guard ring, and an auxiliary hook is further provided between any two adjacent main hooks in the first hook portion, and the auxiliary hook is spaced apart from the adjacent main hooks along the circumference of the guard ring.

9. The retaining ring according to claim 8, characterized in that: The main hook and the auxiliary hook both extend along the circumference of the guard ring, the arc length of the guard ring body is L, the length of the main hook is l1, l1≥0.25L; And / or, the length of the auxiliary hook is l2, 0.125L≤l2≤0.2L.

10. A gas turbine, characterized in that: The gas turbine comprises the shroud according to any one of claims 1-9.

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