Retaining ring with impingement cooling structure

Abstract

The invention provides a retaining ring with an impingement cooling structure, and relates to the technical field of gas turbines.The retaining ring comprises at least two retaining ring bodies and an impingement plate, the retaining ring bodies are sequentially connected end to end to form the annular retaining ring, and each retaining ring body is provided with a cooling cavity and an exhaust hole set communicated with the cooling cavity; the cooling cavity is provided with a plurality of turbulent flow units, the multiple turbulent flow units are arranged at intervals in the circumferential direction of the protective ring, and each turbulent flow unit comprises a plurality of first turbulent flow pieces arranged at intervals in the axial direction of the protective ring; in any two adjacent turbulent flow units, a second turbulent flow piece is arranged between any two adjacent first turbulent flow pieces in one turbulent flow unit, and an impact area is defined between any two adjacent first turbulent flow pieces in the other turbulent flow unit; the impact plate is connected with the retaining ring body part and used for sealing the cooling cavity, and the impact plate is provided with an air inlet hole. The composite impact cooling structure is adopted to improve the cooling and heat exchange effects, so that the temperature of the protection ring is reduced, and the working 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 with an impingement cooling structure. 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 the present invention provides a guard ring with an impingement cooling structure. The guard ring with the impingement cooling structure adopts a composite impingement cooling structure to improve the cooling and heat exchange effect, so as to reduce the temperature of the guard ring and ensure the working reliability of the guard ring.

[0006] According to an embodiment of the present invention, a guard ring with an impingement cooling structure comprises a guard ring body and an impingement plate, wherein the guard ring body has at least two parts, and all the guard ring body parts are connected end to end in sequence to form an annular guard ring, the guard ring body is constructed as an arc-shaped part extending along the circumference of the guard ring, the guard ring body has a cooling cavity and is provided with an exhaust hole group connected to the cooling cavity, the cooling cavity is provided with a plurality of spoiler units, the plurality of spoiler units are arranged at intervals along the circumference of the guard ring, each of the spoiler units comprises a plurality of first spoilers arranged at intervals along the axial direction of the guard ring, and along the circumference of the guard ring, any of the spoilers The projection of the first spoiler in the flow unit and the projection of the first spoiler in the adjacent spoiler unit are arranged alternately along the axial direction of the protective ring; in any two adjacent spoiler units, a second spoiler is provided between any two adjacent first spoilers in one of the spoiler units, and an impact zone is defined between any two adjacent first spoilers in the other spoiler unit; the impact plate is connected to the protective ring body and is used to cover the cooling cavity, the impact plate is provided with an air inlet hole, the air inlet hole is connected to the cooling cavity and is suitable for introducing a cooling medium into the cooling cavity, and there are multiple air inlet holes and they correspond one to one to the impact zones.

[0007] According to the guard ring with an impingement cooling structure of an embodiment of the present invention, the guard ring structure is formed by connecting the guard ring body parts in sequence, and the cooling cavity on the guard ring body part, the spoiler unit in the cooling cavity, and the air inlet hole on the impact plate cooperate to construct a composite impingement cooling structure on the guard ring body part, so that after the cooling medium impacts the impact zone through the air inlet hole on the impact plate, the first spoiler and the second spoiler surrounding the impact zone can destroy the boundary layer of the non-impact zone to achieve enhanced convective heat transfer, and after the heat exchange is completed, it is discharged through the exhaust hole group, thereby improving the cooling effect on the guard ring, so as to ensure that the guard ring can work reliably in a high-temperature gas environment. Therefore, compared with the related art, the present invention adopts a composite impingement cooling structure to improve the cooling and heat exchange effect, so as to reduce the temperature of the guard ring and ensure the working reliability of the guard ring.

[0008] In some embodiments, the cooling cavity has an impact target surface, the impact target surface and the impact plate are arranged at intervals along the radial direction of the guard ring, the first spoiler and the second spoiler are both formed on the impact target surface and one of them is a boss and the other is a groove.

[0009] In some embodiments, the central axis of the air inlet is a straight line.

[0010] In some embodiments, a cross-sectional area of ​​the boss gradually decreases along a direction from the impact target surface toward the impact plate.

[0011] In some embodiments, an edge of each of the boss and the groove is smoothly connected to the impact target surface.

[0012] In some embodiments, on the impact target surface, the outer contour of the projection of each of the boss and the groove may be one of a circle, an ellipse, a racetrack, and any closed curve.

[0013] In some embodiments, the exhaust hole group includes a first cooling hole and a second cooling hole, and the first cooling hole and the second cooling hole are respectively arranged on both sides of the cooling cavity along the axial direction of the guard ring;

[0014] The first cooling hole extends from the inner circumferential wall of the cooling cavity toward the leading edge of the guard ring and extends to the leading edge, and the second cooling hole extends from the inner circumferential wall of the cooling cavity toward the trailing edge of the guard ring and extends to the trailing edge. There are a plurality of the first cooling holes and the second cooling holes, and the holes are arranged at intervals along the circumference of the guard ring.

[0015] In some embodiments, a central axis of each of the first cooling hole and the second cooling hole is a straight line.

[0016] In some embodiments, the shortest distance between any position of the central axis of each of the first cooling hole and the second cooling hole and the inner wall surface of the guard ring is equal.

[0017] In some embodiments, a contour line of a cross section of each of the first cooling hole and the second cooling hole may be one of a circle, a racetrack, and any closed curve.

[0018] In some embodiments, the exhaust hole group also includes a third cooling hole, which is located on the outer side of the cooling cavity 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. The third cooling hole extends in a direction from the inner circumferential wall of the cooling cavity toward any one of the first end face and the second end face of the guard ring and extends to the corresponding end face. There are multiple third cooling holes and they are arranged at intervals along the axial direction of the guard ring.

[0019] 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;

[0020] Each of the first cooling hole, the second cooling hole, and the third cooling hole is closer to the inner wall surface of the guard ring than the sealing assembly.

[0021] 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.

[0022] 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.

[0023] 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, and the cooling cavity is formed on the groove.

[0024] 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.

[0025] 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, the length of the main hook is l1, and l1≥0.25L.

[0026] In some embodiments, the length of the auxiliary hook is l2, 0.125L≤l2≤0.2L.

[0027] 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

[0028] Figure 1 is a schematic structural diagram of a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of the connection structure of two guard ring main bodies in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0030] Figure 3 1 is a perspective structural schematic diagram of a guard ring body in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0031] Figure 4 yes Figure 3 Schematic diagram of the top view structure.

[0032] Figure 5 It is a schematic diagram of the connection structure between the first spoiler, the second spoiler and the impact target surface in the guard ring with an impact cooling structure according to an embodiment of the present invention.

[0033] Figure 6 1 is a schematic diagram of a first cross-sectional structure of a guard ring body portion in a guard ring with an impingement cooling structure according to an embodiment of the present invention (an impingement plate is installed in the figure).

[0034] Figure 7 1 is a schematic diagram of a second cross-sectional structure of a guard ring body portion in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0035] Figure 8 It is a schematic diagram of the exploded structure of a guard ring body and a sealing assembly in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0036] Fig. 9 It is a schematic diagram of the connection structure of two sealing components in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0037] Fig.10 It is a schematic diagram of the connection structure of a guard ring body, a first sealing sheet and a second sealing sheet in a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0038] Fig.11 It is a schematic diagram of the connection structure of the guard ring body, the second sealing sheet and the third sealing sheet in the guard ring with the impingement cooling structure according to an embodiment of the present invention.

[0039] Fig.12 Schematic diagram of a numerical analysis unit of a guard ring with an impingement cooling structure according to an embodiment of the present invention.

[0040] Fig.13 yes Fig.12 Temperature distribution diagram of metal wall temperature on the gas side.

[0041] Fig.14 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.

[0042] Figure numerals: 1. guard ring body, 11. cooling cavity, 111. first spoiler, 112. second spoiler, 113. impact zone, 114. impact target surface, 12. exhaust hole group, 121. first cooling hole, 122. second cooling hole, 123. third cooling hole, 13. first end face, 14. second end face, 15. first hook part, 151. main hook, 152. auxiliary hook, 16. second hook part, 2. impact plate, 21. air inlet, 3. leading edge, 4. trailing edge, 5. sealing assembly, 51. accommodating cavity, 52. first sealing sheet, 53. second sealing sheet, 54. third sealing sheet, 55. first seam, 56. second seam. DETAILED DESCRIPTION

[0043] 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.

[0044] like Figures 1 to 4 As shown, a guard ring with an impingement cooling structure according to an embodiment of the present invention comprises a guard ring body 1 and an impingement plate 2, wherein there are at least two guard ring body parts 1, and all the guard ring body parts 1 are connected end to end in sequence to form an annular guard ring, and the guard ring body part 1 is constructed as an arc-shaped part extending along the circumference of the guard ring, and the guard ring body part 1 has a cooling cavity 11 and is provided with an exhaust hole group 12 connected to the cooling cavity 11, and the cooling cavity 11 is provided with a plurality of spoiler units, and the plurality of spoiler units are arranged at intervals along the circumference of the guard ring, and each spoiler unit comprises a plurality of first spoilers 111 arranged at intervals along the axial direction of the guard ring, and along the circumference of the guard ring, the projection of the first spoiler 111 in any spoiler unit and the projection of the first spoiler 111 in the adjacent spoiler unit along the axial direction of the guard ring. Staggered arrangement; in any two adjacent spoiler units, a second spoiler 112 is provided between any two adjacent first spoiler members 111 in one of the spoiler units, and an impact zone 113 is defined between any two adjacent first spoiler members 111 in the other spoiler unit; the impact plate 2 is connected to the guard ring body 1 and is used to cover the cooling cavity 11, the impact plate 2 is provided with an air inlet 21, the air inlet 21 is connected to the cooling cavity 11 and is suitable for introducing a cooling medium into the cooling cavity 11, there are multiple air inlet holes 21 and they correspond one-to-one to the impact zone 113, that is, after the impact plate 2 covers the cooling cavity 11, the position of the air inlet hole 21 corresponds one-to-one to the position of the impact zone 113, and the projection of the air inlet hole 21 in the cooling cavity 11 can completely fall into the impact zone 113.

[0045] It can be understood that the guard ring with an impingement cooling structure according to the embodiment of the present invention is formed by connecting the guard ring body parts 1 in sequence, and the cooling cavity 11 on the guard ring body part 1, the spoiler unit in the cooling cavity 11, and the air inlet 21 on the impact plate 2 cooperate to construct a composite impingement cooling structure on the guard ring body part 1, so that after the cooling medium impacts the impact zone 113 through the air inlet 21 on the impact plate 2, the first spoiler 111 and the second spoiler 112 surrounding the impact zone 113 can destroy the boundary layer of the non-impact zone 113 to achieve enhanced convective heat transfer, and after the heat exchange is completed, it is discharged through the exhaust hole group 12, thereby improving the cooling effect on the guard ring, so as to ensure that the guard ring can work reliably in a high-temperature gas environment. Therefore, compared with the related art, the present invention adopts a composite impingement cooling structure to improve the cooling and heat exchange effect, so as to reduce the temperature of the guard ring and ensure the working reliability of the guard ring.

[0046] Specifically, the cooling medium may not be limited to cooling air. The cooling cavity 11 may be configured as an arc-shaped cavity extending in the circumferential direction of the guard ring. A plurality of spoiler units may be arranged at equal or unequal intervals in the circumferential direction of the guard ring. A plurality of first spoilers 111 may be arranged at equal or unequal intervals in the axial direction of the guard ring. The outer peripheral side of any impact zone 113 may surround the first spoiler 111 and the second spoiler 112. Taking the figure as an example, the outer peripheral side of any impact zone 113 circumferentially symmetrically surrounds the first spoiler 111 and the second spoiler 112. The impact plate 2 may be configured as an arc-shaped plate extending in the circumferential direction of the guard ring. The air inlet 21 may be a through hole that penetrates the impact plate 2 in the thickness direction of the impact plate 2, and the thickness direction of the impact plate 2 may be consistent with the radial direction of the guard ring.

[0047] Preferably, the plurality of spoiler units are arranged at equal intervals along the circumference of the guard ring, the plurality of first spoilers 111 in each spoiler unit are arranged at equal intervals along the axial direction of the guard ring, and the spacing between two adjacent first spoilers 111 in any spoiler unit is equal to the spacing between two adjacent first spoilers 111 in adjacent spoiler units, so as to make the cooling effect of the guard ring body 1 uniform, reduce the temperature gradient and thermal stress, and further improve the safety and reliability of the guard ring during operation.

[0048] like Figures 3 to 5 As shown, in some embodiments, the cooling cavity 11 has an impact target surface 114, and the impact target surface 114 and the impact plate 2 are arranged at intervals along the radial direction of the guard ring. The first spoiler 111 and the second spoiler 112 are both formed on the impact target surface 114, and one of them is a boss and the other is a groove.

[0049] It can be understood that the first spoiler 111 and the second spoiler 112 use a groove and boss structure to destroy the boundary layer of the non-impact core area, which is beneficial to production and processing. Compared with the impact cooling structure in the related art, it can also increase the heat exchange area and further improve the cooling effect of the guard ring, so as to reduce the temperature of the high-temperature alloy and coating part in the guard ring under the same cooling air volume conditions, allowing a higher turbine inlet temperature.

[0050] like Figures 3 to 6 As shown, in some embodiments, the central axis of the air inlet hole 21 is a straight line, that is, the air inlet hole 21 is a straight hole. The aforementioned structural design is beneficial to the production and processing of the air inlet hole 21, and allows the cooling medium to directly impact the impact area 113 on the impact target surface 114, thereby ensuring the cooling and heat exchange efficiency.

[0051] like Figures 3 to 5 As shown, in some embodiments, the cross-sectional area of ​​the boss gradually decreases along the direction from the impact target surface 114 toward the impact plate 2 .

[0052] like Figures 3 to 5 As shown, in some embodiments, the edge of each of the boss and the groove is smoothly connected to the impact target surface 114, that is, each of the boss and the groove is connected to the impact target surface 114 with a rounded transition to reduce the lateral disturbance of the impact cooling airflow.

[0053] It should be noted that the principle of enhanced heat exchange by impingement cooling in the relevant technology is to gradually form a boundary layer with an impingement stagnation point as the center and increase its thickness. Therefore, the technical approach to improving the heat exchange effect of cooling air on the basis of impingement cooling in the relevant technology is to keep the impingement core area, i.e., the area where the boundary layer thickness is close to 0, smooth, and use a rounded transition method to smoothly transition to the groove and boss structure, thereby fully utilizing the advantages of impingement cooling.

[0054] like Figures 3 to 5 As shown, in some embodiments, on the impact target surface 114, the outer contour of the projection of each of the boss and the groove can be one of a circle, an ellipse, a racetrack, and any closed curve. For example, the boss can be an elliptical cone boss, a circular cone boss, or a racetrack cone boss; the groove can be a spherical groove, an elliptical cylinder groove, or a racetrack groove.

[0055] like Figure 3 and Figure 4 As shown, in some embodiments, the exhaust hole group 12 includes a first cooling hole 121 and a second cooling hole 122, and the first cooling hole 121 and the second cooling hole 122 are respectively arranged on both sides of the cooling cavity 11 along the axial direction of the guard ring.

[0056] The first cooling hole 121 extends from the inner circumferential wall of the cooling cavity 11 toward the leading edge 3 of the guard ring and extends to the leading edge 3, and the second cooling hole 122 extends from the inner circumferential wall of the cooling cavity 11 toward the trailing edge 4 of the guard ring and extends to the trailing edge 4. There are multiple first cooling holes 121 and second cooling holes 122 and they are arranged at intervals along the circumference of the guard ring.

[0057] It can be understood that the use of the first cooling holes 121 and the second cooling holes 122 can form cooling zones on the opposite sides of the cooling cavity 11 along the axial direction of the guard ring to ensure the cooling and heat exchange effect on the leading edge 3 and the trailing edge 4 of the guard ring, and the cooperation of multiple first cooling holes 121 and multiple second cooling holes 122 can also ensure the cooling and heat exchange surface of the guard ring body 1 to the greatest extent.

[0058] Specifically, the inlet of the first cooling hole 121 and the inlet of the second cooling hole 122 can both be opened on the inner peripheral wall of the cooling cavity 11. The outlet of the first cooling hole 121 is opened at the front edge 3 of the guard ring to communicate with the outside world. The outlet of the second cooling hole 122 is opened at the rear edge 4 of the guard ring to communicate with the outside world. The plurality of first cooling holes 121 can be arranged at equal intervals or unequal intervals along the circumference of the guard ring. The plurality of second cooling holes 122 can be arranged at equal intervals or unequal intervals along the circumference of the guard ring.

[0059] Preferably, a plurality of first cooling holes 121 are arranged at equal intervals along the circumference of the guard ring, and a plurality of second cooling holes 122 are arranged at equal intervals along the circumference of the guard ring. On a projection plane perpendicular to the axial direction of the guard ring, the inlets and outlets of all the first cooling holes 121 are flush with each other, and the inlets and outlets of all the second cooling holes 122 are flush with each other.

[0060] like Figure 6 As shown, in some embodiments, the central axis of each of the first cooling hole 121 and the second cooling hole 122 is a straight line, that is, the first cooling hole 121 and the second cooling hole 122 are straight holes, so as to reduce the manufacturing difficulty and cost, so that the first cooling hole 121 and the second cooling hole 122 can be machined by traditional electrospark machining, for example.

[0061] like Figure 7 As shown, in some embodiments, the shortest distance between any position of the central axis of each of the first cooling hole 121 and the second cooling hole 122 and the inner wall surface of the guard ring (that is, the wall surface of the guard ring adjacent to the gas channel) is equal, that is, the first cooling hole 121 and the second cooling hole 122 are both conformal holes conforming to the inner wall surface of the guard ring, so as to further optimize the cooling and heat exchange effect of the guard ring.

[0062] In some embodiments, the contour line of the cross section of each of the first cooling hole 121 and the second cooling hole 122 may be one of a circle, a racetrack, and any closed curve.

[0063] like Figure 3 and Figure 4 As shown, in some embodiments, on the radial projection surface of the vertical guard ring, the projections of the plurality of first cooling holes 121 are arranged divergently on the outer peripheral side of the cooling cavity 11, and the projections of the plurality of second cooling holes 122 are arranged divergently on the outer peripheral side of the cooling cavity 11, so as to form a maximum cooling coverage area on the leading edge 3 and the trailing edge 4 of the guard ring, which helps to ensure uniform cooling effect of the guard ring, low temperature gradient, reduce local thermal stress, and improve the working reliability of the guard ring.

[0064] like Figure 3 and Figure 4 As shown, in some embodiments, the exhaust hole group 12 also includes a third cooling hole 123, which is located on the outer side of the cooling cavity 11 along the circumferential direction of the guard ring. The guard ring body 1 also has a first end face 13 and a second end face 14 arranged relatively to each other along the circumferential direction of the guard ring. The third cooling hole 123 extends in a direction from the inner circumferential wall of the cooling cavity 11 toward any one of the first end face 13 and the second end face 14 of the guard ring and extends to the corresponding end face. There are multiple third cooling holes 123 and they are arranged at intervals along the axial direction of the guard ring.

[0065] It can be understood that, by cooperating with the first cooling hole 121, the second cooling hole 122 and the third cooling hole 123, an annular cooling heat exchange zone can be formed on the outer peripheral side of the cooling cavity 11, so as to cooperate with the composite impact cooling heat exchange of the cooling cavity 11 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.

[0066] like Figure 8 and Fig. 9 As shown, in some embodiments, the guard ring further includes a sealing component 5, which is installed on the guard ring body 1. There are at least two sealing components 5 and they correspond one to one with the guard ring body 1. All sealing components 5 are connected end to end in sequence along the circumference of the guard ring, and any two adjacent sealing components 5 are commonly surrounded by a receiving cavity 51 for accommodating the guard ring body 1, so as to form an annular seal on the circumference of the guard ring body 1.

[0067] Each of the first cooling hole 121 , the second cooling hole 122 , and the third cooling hole 123 is closer to the inner wall surface of the guard ring than the sealing assembly 5 .

[0068] It can be understood that the sealing assembly 5 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 cooling hole 121, the second cooling hole 122 and the third cooling hole 123 are closer to the gas channel of the guard ring than the sealing assembly 5, effective cold air covering protection can be formed between the sealing assembly 5 and the gas channel, further ensuring the working safety and reliability of the sealing assembly 5.

[0069] like Figure 8 and Fig. 9 As shown, in some embodiments, the sealing assembly 5 includes a first sealing sheet 52, a second sealing sheet 53 and a third sealing sheet 54 which are connected in sequence, one of the first sealing sheet 52 and the third sealing sheet 54 is located at the front edge 3 of the guard ring, and the other is located at the rear edge 4 of the guard ring, and the second sealing sheet 53 is located at the connection between any two adjacent guard ring body parts 1. Any sealing assembly 5 and the second sealing sheet 53 of the adjacent sealing assembly 5 are together surrounded by a receiving cavity 51 to ensure the sealing performance of the guard ring while further simplifying the overall sealing structure of the guard ring.

[0070] Specifically, the front edge 3, the rear edge 4, the first end face 13 and the second end face 14 of the guard ring can be provided with mounting grooves. The front edge 3 and the rear edge 4 of the guard ring extend along the circumferential direction of the guard ring, and the first end face 13 and the second end face 14 of the guard ring extend along 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 3, the rear edge 4, the first end face 13 or the second end face 14 of the guard ring). The first sealing sheet 52, the second sealing sheet 53 and the third sealing sheet 54 can all fit in the mounting groove.

[0071] like Fig.10 and Fig.11 As shown, in some embodiments, a first seam 55 is formed between the first sealing sheet 52 and the second sealing sheet 53, and a second seam 56 is formed between the second sealing sheet 53 and the third sealing sheet 54. At least one of the first seam 55 and the second seam 56 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 52 and the second sealing sheet 53, or between the second sealing sheet 53 and the third sealing sheet 54), ensure the connection reliability between the two, and at the same time reduce the amount of cold air leakage and improve the sealing of the protective ring.

[0072] Specifically, taking the figure as an example, the first sealing sheet 52 and the second sealing sheet 53, as well as the second sealing sheet 53 and the third sealing sheet 54 are installed by concave-convex tooth engagement, wherein grooves can be opened on the first sealing sheet 52 and the third sealing sheet 54, and a convex tooth platform can be formed on the second sealing sheet 53.

[0073] like Figure 3As shown, in some embodiments, the outer wall surface of the guard ring body 1 is provided with a first hook portion 15 and a second hook portion 16, and the first hook portion 15 and the second hook portion 16 are both suitable for connecting with the holding ring, and the first hook portion 15 and the second hook portion 16 are arranged at intervals along the axial direction of the guard ring and together with the guard ring body 1 form a groove, and a cooling cavity 11 is formed on the groove, that is, the cooling cavity 11 is opened on the groove and faces the end opening of the outer wall surface of the guard ring (that is, the wall surface of the guard ring away from the gas side channel), and the impact plate 2 covers the end opening of the cooling cavity 11.

[0074] It can be understood that the first hook portion 15 and the second hook portion 16 can provide sufficient installation support and contact friction between the guard ring body 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.

[0075] like Figure 3 As shown, in some embodiments, the first hook portion 15 is closer to the front edge 3 of the guard ring than the second hook portion 16, and the first hook portion 15 and the second hook portion 16 are each provided with at least two main hooks 151, and all the main hooks 151 of each of the first hook portion 15 and the second hook portion 16 are arranged at intervals along the circumference of the guard ring, and an auxiliary hook 152 is further provided between any two adjacent main hooks 151 in the first hook portion 15, and the auxiliary hook 152 is spaced apart from the adjacent main hooks 151 along the circumference of the guard ring.

[0076] It can be understood that there is a gap between two adjacent main hooks 151, or between adjacent main hooks 151 and auxiliary hooks 152 in the circumferential direction of the guard ring, so that the first hook portion 15 and the second hook portion 16 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 3 and the trailing edge 4 of the guard ring to form a cooling cavity 11 between the stator end wall structures adjacent to the guard ring to avoid gas intrusion.

[0077] Specifically, the first hook portion 15 and the second hook portion 16 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 15 faces the front edge 3 side of the guard ring, and the hook body of the second hook portion 16 faces the rear edge 4 side of the guard ring. Taking the figure as an example, the first hook portion 15 may include a main hook 151, an auxiliary hook 152, and a main hook 151 arranged at intervals along the circumference of the guard ring, and the second hook portion 16 may include three main hooks 151 arranged at intervals along the circumference of the guard ring.

[0078] like Figure 3 As shown, in some embodiments, the main hook 151 and the auxiliary hook 152 both extend along the circumference of the guard ring, the arc length of the guard ring body 1 is L, the length of the main hook 151 is l1, and l1≥0.25L.

[0079] like Figure 3 As shown, in some embodiments, the length of the auxiliary hook 152 is l2, 0.125L≤l2≤0.2L.

[0080] It can be understood that the main hook 151 and the auxiliary hook 152 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.

[0081] 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.

[0082] 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 metal wall temperature on the gas side of the composite impingement 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.

[0083] In addition, under the conditions of similar gas operation and the same cooling air volume, based on Fig.12 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.13 The temperature distribution diagram of the metal wall temperature on the gas side when the guard ring adopts a composite impingement cooling structure in the present invention is shown, and Fig.14 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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 with an impingement cooling structure, characterized in that: include: A guard ring body, wherein there are at least two guard ring body parts, and all the guard ring body parts are connected end to end in sequence to form an annular guard ring, and the guard ring body part is constructed as an arc-shaped part extending along the circumference of the guard ring, and the guard ring body part has a cooling cavity and is provided with an exhaust hole group connected to the cooling cavity, and the cooling cavity is provided with a plurality of spoiler units, and the plurality of spoiler units are arranged at intervals along the circumference of the guard ring, and each of the spoiler units includes a plurality of first spoilers arranged at intervals along the axial direction of the guard ring, and along the circumference of the guard ring, the projection of the first spoiler in any spoiler unit and the projection of the first spoiler in the adjacent spoiler unit are arranged alternately along the axial direction of the guard ring; In any two adjacent spoiler units, a second spoiler is provided between any two adjacent first spoilers in one of the spoiler units, and an impact zone is defined between any two adjacent first spoilers in the other spoiler unit; and An impact plate, the impact plate is connected to the guard ring body and is used to seal the cooling cavity. The impact plate is provided with an air inlet hole, the air inlet hole is connected to the cooling cavity and is suitable for introducing a cooling medium into the cooling cavity. There are multiple air inlet holes and they correspond one-to-one to the impact zones.

2. The guard ring with an impingement cooling structure according to claim 1, characterized in that: The cooling cavity has an impact target surface, the impact target surface and the impact plate are arranged at intervals along the radial direction of the guard ring, the first spoiler and the second spoiler are both formed on the impact target surface, and one of them is a boss and the other is a groove; And / or, the central axis of the air inlet is a straight line.

3. The guard ring with an impingement cooling structure according to claim 2, characterized in that: The cross-sectional area of ​​the boss gradually decreases along the direction from the impact target surface toward the impact plate; and / or, an edge of each of the boss and the groove is smoothly connected to the impact target surface; And / or, on the impact target surface, the outer contour of the projection of each of the boss and the groove can be one of a circle, an ellipse, a racetrack and any closed curve.

4. The guard ring with an impingement cooling structure according to any one of claims 1 to 3, characterized in that: The exhaust hole group includes a first cooling hole and a second cooling hole, wherein the first cooling hole and the second cooling hole are respectively arranged on both sides of the cooling cavity along the axial direction of the guard ring; The first cooling hole extends from the inner circumferential wall of the cooling cavity toward the leading edge of the guard ring and extends to the leading edge, and the second cooling hole extends from the inner circumferential wall of the cooling cavity toward the trailing edge of the guard ring and extends to the trailing edge. There are a plurality of the first cooling holes and the second cooling holes, and the holes are arranged at intervals along the circumference of the guard ring.

5. The guard ring with an impingement cooling structure according to claim 4, characterized in that: The central axis of each of the first cooling hole and the second cooling hole is a straight line; And / or, the shortest distance between any position of the central axis of each of the first cooling hole and the second cooling hole and the inner wall surface of the guard ring is equal. And / or, a contour line of a cross section of each of the first cooling hole and the second cooling hole may be one of a circle, a racetrack, and any closed curve.

6. The guard ring with an impingement cooling structure according to claim 4, characterized in that: The exhaust hole group also includes a third cooling hole, which is located on the outer side of the cooling cavity along the circumferential direction 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 circumferential direction of the guard ring. The third cooling hole extends from the inner circumferential wall of the cooling cavity toward any one of the first end face and the second end face of the guard ring and extends to the corresponding end face. There are multiple third cooling holes and they are arranged at intervals along the axial direction of the guard ring.

7. The guard ring with an impingement cooling structure according to claim 6, 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 cooling hole, the second cooling hole, and the third cooling hole is closer to the inner wall surface of the guard ring than the sealing assembly.

8. The guard ring with an impingement cooling structure according to claim 7, 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.

9. The guard ring with an impingement cooling structure 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, and the first hook portion and the second hook portion are both suitable for being connected to a holding ring. 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 the cooling cavity is formed on the 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.

10. The guard ring with an impingement cooling structure according to claim 9, 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.

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