Heat insulation tile with staggered cooling channels for combustion chamber and heat shield

Abstract

The invention discloses a heat insulation tile with staggered cooling channels for a combustion chamber and a heat shield in the technical field of gas turbines. The heat insulation tile comprises a heat side wall and an outer edge connected with the periphery. The cold side wall is arranged on one side of the hot side wall and connected with the outer edge, and a cavity is defined by the hot side wall, the outer edge and the cold side wall; the multiple transverse cooling channels are longitudinally arranged on the cold face of the hot side wall at intervals, one end of each transverse cooling channel penetrates through the outer edge, the other end of each transverse cooling channel communicates with the cavity, and the flowing directions of cooling gas in every two adjacent transverse cooling channels are opposite; the multiple longitudinal cooling channels are transversely arranged in the hot side wall at intervals, one end of each longitudinal cooling channel penetrates through the outer edge, the other end of each longitudinal cooling channel communicates with the cavity, and the flowing directions of cooling gas in every two adjacent longitudinal cooling channels are opposite. The heat insulation tile has high cooling efficiency, all positions of the heat insulation tile can be evenly cooled, and the ablation phenomenon caused by too high local temperature is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and particularly relates to a heat shield and a thermal screen with staggered cooling channels for a combustion chamber. Background Art

[0002] The compressor, the combustion chamber, and the turbine are the three core components of a gas turbine unit. Its working process is as follows: air is inhaled by the compressor, pressurized into high-pressure gas by the blades, then enters the combustion chamber, mixes with fuel and burns. After the gas burns and expands due to heat, it enters the turbine, pushes the blades to rotate until the gas is discharged at the outlet. With the improvement of gas turbine performance, the temperature in the combustion chamber can reach 1700K or even higher under operating conditions, far exceeding the allowable working temperature range of the combustion chamber housing. In order to ensure the stable and reliable operation of the combustion chamber, a thermal screen needs to be installed on the inner wall surface of the combustion chamber housing to prevent the combustion chamber housing from overheating.

[0003] Currently, the heat shields used for gas turbine combustion chamber housings are mainly ceramic tiles and metal tiles. Among them, due to process limitations, ceramic tiles have problems that they cannot be realized in areas with large curvatures. At the same time, the thermal stress generated by the large temperature gradient between the hot side and the cold side of ceramic tiles is likely to cause cracks or even fracture and damage to the ceramic tiles. For metal tiles, since the melting points of most materials are lower than the internal temperature of the combustion chamber, it is necessary to cool with cooling gas and combine with spraying an insulating coating on the surface of the metal substrate to avoid ablation damage of the metal tiles. However, the existing metal tile structures are single, and most of them achieve cooling through simple impingement or film cooling, which is extremely easy to cause ablation of the tile due to local overheating. The heat shield with impingement cooling has a large amount of cooling gas consumption. The cooling effect is good at the impingement position, but the temperature is high in the non-impingement area, resulting in uneven temperature distribution of the entire heat shield. At the same time, a certain height of impingement space is required to ensure the impingement effect. The film cooling heat shield has requirements for the air flow direction.

[0004] The patent document with the publication number CN107076414B discloses a thermal shielding element and a method for manufacturing the same. The cooling channels of this thermal shielding element are centrally arranged at the fixing device, and the cooling gas is concentrated near the fixing device, which is likely to cause uneven cooling between the middle part and the surrounding of the thermal shielding element, and further cause the heat shield to be easily ablated due to local overheating.

[0005] The patent with the publication number CN110906364A discloses a metal heat insulating brick composed of a shielding plate and an outer edge. The gas in the air chamber enters the cooling chamber through the feeding hole in the first shell to cool the metal heat insulating brick, and then is discharged through a plurality of sealing holes with corresponding hole axes on the outer edge. This metal heat insulating brick adopts the impingement cooling method, which not only requires a large amount of cold air volume, but also has the problem of uneven temperature distribution of the heat shield. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a heat shield with staggered cooling channels for a combustion chamber, so as to solve the technical problem that the existing heat shield is prone to ablation due to uneven cooling.

[0007] The technical solution adopted by the present invention is as follows: A heat shield with staggered cooling channels for a combustion chamber, comprising:

[0008] A hot side wall, with an outer edge connected to the periphery of the hot side wall;

[0009] A cold side wall, which is arranged on one side of the hot side wall, is connected to the outer edge, and the hot side wall, the outer edge and the cold side wall enclose a chamber, and an air inlet hole communicating with the chamber is provided on the cold side wall;

[0010] Transverse cooling channels, a plurality of the transverse cooling channels are longitudinally spaced on the cold surface of the hot side wall, one end of the transverse cooling channel penetrates the outer edge, the other end of the transverse cooling channel communicates with the chamber, and the flow directions of the cooling gas in two adjacent transverse cooling channels are opposite;

[0011] Longitudinal cooling channels, a plurality of the longitudinal cooling channels are transversely spaced inside the hot side wall, one end of the longitudinal cooling channel penetrates the outer edge, the other end of the longitudinal cooling channel communicates with the chamber, and the flow directions of the cooling gas in two adjacent longitudinal cooling channels are opposite.

[0012] Preferably, the chamber is in a shape of "mouth", "field" or "sun".

[0013] Preferably, the chamber includes a connected transverse chamber and a longitudinal chamber, and a plurality of the transverse cooling channels are longitudinally spaced between two adjacent transverse chambers, and a plurality of the longitudinal cooling channels are transversely spaced between two adjacent longitudinal chambers.

[0014] Preferably, transverse cooling channels are provided on the cold surface of the hot side wall opposite to the transverse chamber, and longitudinal cooling channels are provided inside the hot side wall opposite to the longitudinal chamber.

[0015] Preferably, a mounting hole is provided in the middle of the hot side wall, and the transverse cooling channel and the longitudinal cooling channel opposite to the mounting hole are divided into two axial sections; one end of one section of the transverse cooling channel and the longitudinal cooling channel axially penetrates the outer edge, and the other end communicates with the chamber; one end of the other section of the transverse cooling channel and the longitudinal cooling channel communicates with the chamber, and the other end communicates with the mounting hole.

[0016] Preferably, the number of the air inlet holes is one or more, and the air inlet holes are round holes or polygonal holes.

[0017] Preferably, the hot side wall, the outer edge and the cold side wall are formed by additive manufacturing; or the hot side wall, the outer edge and the cold side wall are manufactured by precision casting; or the hot side wall, the outer edge and the cold side wall are connected by welding.

[0018] The second object of the present invention is to provide a thermal shield, which includes the heat insulation tile with staggered cooling channels for the combustion chamber as described above. A plurality of the heat insulation tiles are arranged in the horizontal direction and the vertical direction, and the exhaust positions of the transverse cooling channels of two adjacent heat insulation tiles on the outer edge are vertically offset, and the exhaust positions of the longitudinal cooling channels of two adjacent heat insulation tiles on the outer edge are horizontally offset.

[0019] The beneficial effects of the present invention:

[0020] In the present invention, transverse cooling channels and longitudinal cooling channels that are vertically and three-dimensionally crossed are provided on the cold surface and inside of the hot side wall of the heat insulation tile, and a chamber is formed between the cold side wall and the hot side wall. At the same time, one end of the transverse cooling channel and the longitudinal cooling channel is communicated with the chamber, and the other end penetrates the outer edge of the heat insulation tile, so that the cooling gas in two adjacent transverse cooling channels and longitudinal cooling channels flows in the opposite direction, ensuring uniform cooling of each position of the hot side wall and effectively preventing the occurrence of the ablation phenomenon of the metal tile. At the same time, the cooling gas outlet positions of the transverse cooling channel and the longitudinal cooling channel on both sides of the heat insulation tile are different. When a plurality of heat insulation tiles are closely arranged longitudinally and transversely, the outlet positions of the air outlets on the outer edge of two adjacent heat insulation tiles are offset from each other, so that the cooling gas discharged from two adjacent heat insulation tiles can cool each other, which helps to improve the cooling efficiency of the heat insulation tile. Description of the Drawings

[0021] Figure 1 is a three-dimensional schematic diagram of the heat insulation tile with staggered cooling channels for the combustion chamber of the present invention;

[0022] Figure 2 is a top view of the heat insulation tile with staggered cooling channels for the combustion chamber of the present invention;

[0023] Figure 3 View A-A in;

[0024] Figure 4 View B-B in;

[0025] Figure 5 View C-C in;

[0026] Figure 6 View D-D in;

[0027] Figure 7 View E-E in;

[0028] Figure 8 is a schematic diagram of the cooling channel outlet on the outer edge of adjacent heat insulation tiles.

[0029] Description of the reference numerals in the drawings:

[0030] 1. Hot side wall; 2. Outer edge; 3. Cold side wall; 4. Chamber; 5. Air inlet hole; 6. Transverse cooling channel; 7. Longitudinal cooling channel; 8. Mounting hole. Detailed implementation manners

[0031] The following further elaborates on the detailed implementation manners of the present invention with reference to the drawings. These implementation manners are only for illustrating the present invention and not for limiting it.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mount", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, in the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0035] Embodiment, as Figures 1 - 8 shown, a heat insulation tile with staggered cooling channels for a combustion chamber, the heat insulation tile comprising:

[0036] A hot side wall 1, the periphery of which is fixedly connected with an outer edge 2.

[0037] A cold side wall 3, which is arranged on one side of the hot side wall 1, and the cold side wall 3 is fixedly connected with the outer edge 2, and a chamber 4 is formed between the hot side wall 1, the outer edge 2 and the cold side wall 3. An air inlet hole 5 communicating with the chamber 4 is provided on the cold side wall 3.

[0038] The lateral cooling channels 6, the number of the lateral cooling channels 6 is multiple, and the longitudinal intervals of the multiple lateral cooling channels 6 are arranged on the cold surface of the hot side wall 1. One end of the lateral cooling channel 6 penetrates through the outer edge 2, the other end of the lateral cooling channel 6 communicates with the chamber 4, and the flowing directions of the cooling gas in two adjacent lateral cooling channels 6 are opposite.

[0039] The longitudinal cooling channels 7, the number of the longitudinal cooling channels 7 is multiple, and the transverse intervals of the multiple longitudinal cooling channels 7 are arranged inside the hot side wall 1. One end of the longitudinal cooling channel 7 penetrates through the outer edge 2, the other end of the longitudinal cooling channel 7 communicates with the chamber 4, and the flowing directions of the cooling gas in two adjacent longitudinal cooling channels 7 are opposite.

[0040] In this application, the lateral cooling channels 6 and the longitudinal cooling channels 7 which are vertically and stereoscopically crossed are arranged on the cold surface and inside of the hot side wall 1 of the heat insulation tile, and a chamber 4 is formed between the hot side wall 1 and the cold side wall 3. At the same time, one end of the lateral cooling channel 6 and the longitudinal cooling channel 7 communicates with the chamber 4, and the other end penetrates through the outer edge 2 of the heat insulation tile, so that the cooling gas in two adjacent lateral cooling channels 6 and two adjacent longitudinal cooling channels 7 flows in opposite directions, ensuring uniform cooling of each position of the hot side wall 1 and effectively preventing the ablation phenomenon of the heat insulation tile. At the same time, the outlet positions of the cooling gas on both sides of the heat insulation tile of the lateral cooling channel 6 and the longitudinal cooling channel 7 are different. After multiple heat insulation tiles are closely arranged longitudinally and transversely, the outlet positions on the outer edges of two adjacent heat insulation tiles are staggered with each other, so that the cooling gas discharged from two adjacent heat insulation tiles can cool each other, which helps to improve the cooling efficiency of the heat insulation tile.

[0041] Specific embodiment 1, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, a heat insulation tile with staggered cooling channels for a combustion chamber, the heat insulation tile includes a hot side wall 1 and a cold side wall 3; an outer edge 2 is fixedly connected to the periphery of the hot side wall 1, that is, an outer edge 2a is fixedly connected to the left side of the hot side wall 1, an outer edge 2b is fixedly connected to the upper edge of the hot side wall 1, an outer edge 2c is fixedly connected to the right side of the hot side wall 1, and an outer edge 2d is fixedly connected to the lower edge of the hot side wall 1.

[0042] The cold side wall 3 is arranged on one side of the hot side wall 1, the cold side wall 3 includes a parallel part 3a and a vertical part 3b, the parallel part 3a is arranged parallel to the hot side wall 1, the vertical part 3b is fixedly connected between the parallel part 3a and the hot side wall 1, and the outer edge 2 is fixedly connected between the parallel part 3a and the hot side wall 1, and a chamber 4 is formed between the hot side wall 1, the outer edge 2 and the cold side wall 3.

[0043] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 5, Figure 6 , Figure 7 As shown in Figure 6 and Figure 7 , the chamber 4 as a whole is in a cross shape, and the chamber 4 includes three laterally disposed transverse chambers 4a arranged in parallel and three longitudinally disposed longitudinal chambers 4b arranged in parallel, and the transverse chambers 4a and the longitudinal chambers 4b communicate with each other; an air inlet hole 5 communicating with the chamber 4 is provided on the cold side wall 3, the air inlet hole 5 is a round hole, the number of the air inlet holes 5 is four, and the four air inlet holes 5 are arranged on the inner cross of the cross-shaped chamber 4, that is, the four air inlet holes 5 are arranged on the transverse chambers 4a and the longitudinal chambers 4b inside the cross-shaped chamber 4.

[0044] In other embodiments, the chamber 4 can be in a square shape or in a rectangle shape.

[0045] In other embodiments, the number of the air inlet holes 5 can be one or more.

[0046] In other embodiments, the air inlet hole 5 can be a round hole, and the round hole includes a regular round hole and an oval hole; it can also be a polygonal hole, and the polygonal hole includes a triangular hole, a square hole, a pentagonal hole, a hexagonal hole, etc.

[0047] Specific embodiment 2, as shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown in Figure 1 to Figure 7 , a heat insulation tile with staggered cooling channels for a combustion chamber includes a hot side wall 1, an outer edge 2 and a cold side wall 3 formed by additive manufacturing, that is, an outer edge 2a is fixedly connected between the left sides of the hot side wall 1 and the cold side wall 3, an outer edge 2b is fixedly connected between the upper edges of the hot side wall 1 and the cold side wall 3, an outer edge 2c is fixedly connected between the right sides of the hot side wall 1 and the cold side wall 3, an outer edge 2d is fixedly connected between the lower edges of the hot side wall 1 and the cold side wall 3, and a chamber 4 is formed between the hot side wall 1, the outer edge 2 and the cold side wall 3.

[0048] The chamber 4 includes a transverse chamber 4a and a longitudinal chamber 4b that are vertically connected, and a plurality of transverse cooling channels 6 are longitudinally spaced between two adjacent transverse chambers 4a, and a plurality of longitudinal cooling channels 7 are transversely spaced between two adjacent longitudinal chambers 4b.

[0049] Specifically, as shown in Figure 1 , Figure 2 , Figure 6 , Figure 7 As shown in Figure 1 to Figure 7 , two transverse cooling channels 6a and a transverse cooling channel 6b are provided between two adjacent transverse chambers 4a, and the transverse cooling channels 6a and the transverse cooling channel 6b are alternately arranged longitudinally.

[0050] As shown in Figure 6As shown, one end (left end) of the transverse cooling channel 6a communicates with the longitudinal cavity 4b near the outer edge 2a, and the other end (right end) of the transverse cooling channel 6a penetrates the outer edge 2c.

[0051] As Figure 7 shown, one end (right end) of the transverse cooling channel 6b communicates with the longitudinal cavity 4b near the outer edge 2c, and the other end (left end) of the transverse cooling channel 6b penetrates the outer edge 2a.

[0052] Preferably, a transverse cooling channel 6 is provided on the cold surface of the hot side wall 1 opposite to the transverse cavity 4a, that is, a transverse cooling channel 6 is provided in each transverse cavity 4a.

[0053] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 shown, two longitudinal cooling channels 7a and 7b are provided between two adjacent longitudinal cavities 4b, and the longitudinal cooling channels 7a and 7b are alternately arranged in the transverse direction.

[0054] As Figure 4 shown, one end (top end) of the longitudinal cooling channel 7a communicates with the transverse cavity 4a near the outer edge 2b, and the other end (bottom end) of the longitudinal cooling channel 7a penetrates the outer edge 2d.

[0055] As Figure 5 shown, one end (bottom end) of the longitudinal cooling channel 7b communicates with the transverse cavity 4a near the outer edge 2d, and the other end (top end) of the longitudinal cooling channel 7b penetrates the outer edge 2b.

[0056] Preferably, a longitudinal cooling channel 7 is provided inside the hot side wall 1 opposite to the longitudinal cavity 4b.

[0057] In other embodiments, as Figure 1 、 Figure 3 shown, a mounting hole 8 is provided in the middle of the hot side wall 1, and the mounting hole 8 is located in the middle of the transverse cavity 4a or the longitudinal cavity 4b. A plurality of transverse cooling channels 6 are longitudinally spaced on the cold surface of the hot side wall 1, and a plurality of longitudinal cooling channels 7 are transversely spaced inside the hot side wall 1, and the transverse cooling channel 6 opposite to the mounting hole 8 is divided into two sections along the axis direction of the transverse cooling channel 6, and the longitudinal cooling channel 7 opposite to the mounting hole 8 is divided into two sections along the axis direction of the longitudinal cooling channel 7.

[0058] Specifically, as Figure 3As shown in the figure, for the horizontal cooling channel 6a, one end (left end) of the first section of the horizontal cooling channel 6a communicates with the longitudinal cavity 4b near the outer edge 2a, and the other end (right end) penetrates through the mounting hole 8; one end (left end) of the second section of the horizontal cooling channel 6a communicates with the opposite horizontal cavity 4a, and the other end (right end) penetrates through the outer edge 2c.

[0059] For the longitudinal cooling channel 7a, one end (top end) of the first section of the longitudinal cooling channel 7a communicates with the horizontal cavity 4a near the outer edge 2b, and the other end (bottom end) penetrates through the mounting hole 8; one end (top end) of the second section of the longitudinal cooling channel 7a communicates with the opposite longitudinal cavity 4b, and the other end (bottom end) penetrates through the outer edge 2d.

[0060] In other embodiments, the hot side wall 1, the outer edge 2, and the cold side wall 3 can also be manufactured by precision casting; or the hot side wall 1, the outer edge 2, and the cold side wall 3 are fixedly connected by welding.

[0061] Example, such as Figure 1 , Figure 8 As shown in the figure, a thermal shield includes the above-mentioned heat-insulating tile with staggered cooling channels for the combustion chamber. A plurality of heat-insulating tiles are arranged in the horizontal and vertical directions, and the exhaust positions of the horizontal cooling channels 6 on the outer edge 2 of adjacent two heat-insulating tiles are vertically offset, and the exhaust positions of the longitudinal cooling channels 7 on the outer edge 2 of adjacent two heat-insulating tiles are horizontally offset.

[0062] Specifically, the horizontal cooling channels 6a of adjacent two heat-insulating tiles are coaxially arranged, and the horizontal cooling channels 6b of adjacent two heat-insulating tiles are coaxially arranged. Among them, the air outlet of the horizontal cooling channel 6a of the first heat-insulating tile on the outer edge 2c is opposite to the connection position of the horizontal cooling channel 6a of the second heat-insulating tile and the outer edge 2a, for cooling the outer edge 2a of the second heat-insulating tile; the air outlet of the horizontal cooling channel 6b of the second heat-insulating tile on the outer edge 2a is opposite to the connection position of the horizontal cooling channel 6b of the first heat-insulating tile and the outer edge 2c, for cooling the outer edge 2c of the first heat-insulating tile.

[0063] The longitudinal cooling channels 7a of adjacent two heat-insulating tiles are coaxially arranged, and the longitudinal cooling channels 7b of adjacent two heat-insulating tiles are coaxially arranged. Among them, the air outlet of the longitudinal cooling channel 7a of the first heat-insulating tile on the outer edge 2d is opposite to the connection position of the longitudinal cooling channel 7a of the second heat-insulating tile and the outer edge 2b, for cooling the outer edge 2b of the second heat-insulating tile; the air outlet of the longitudinal cooling channel 7b of the second heat-insulating tile on the outer edge 2b is opposite to the connection position of the longitudinal cooling channel 7b of the first heat-insulating tile and the outer edge 2d, for cooling the outer edge 2d of the first heat-insulating tile.

[0064] The cooling principle of the heat-insulating tile of the present invention is as follows:

[0065] The cooling gas enters the chamber 4 through the air inlet hole 5. The cooling gas in the chamber 4 enters the transverse cooling channel 6 and the longitudinal cooling channel 7 and flows out through the outer edge 2.

[0066] The transverse cooling channel 6 is a cooling channel from the outer edge 2a to 2c. Taking the transverse cooling channel 6a as an example, the cooling gas enters the transverse cooling channel 6a from the longitudinal chamber 4b near the outer edge 2a, and then flows out through the outer edge 2c; in the transverse cooling channel 6b, the cooling gas enters the transverse cooling channel 6b from the longitudinal chamber 4b near the outer edge 2c, and then flows out through the outer edge 2a.

[0067] The longitudinal cooling channel 7 is perpendicular to the arrangement direction of the transverse cooling channel 6. The longitudinal cooling channel 7 and the transverse cooling channel 6 are staggered but not connected, and the longitudinal cooling channel 7 is arranged inside the hot side wall 1. The longitudinal cooling channel 7 is a cooling channel from the outer edge 2b to the outer edge 2d. Taking the longitudinal cooling channel 7a as an example, the cooling gas enters the longitudinal cooling channel 7a from the transverse chamber 4a near the outer edge 2b, and then flows out through the outer edge 2d; in the longitudinal cooling channel 7b, the cooling gas enters the longitudinal cooling channel 7b from the transverse chamber 4a near the outer edge 2d, and then flows out through the outer edge 2b.

[0068] The heat shield with alternating cooling channels has a high cooling efficiency. At the same time, when multiple heat shields are arranged as a thermal screen, the gas flowing out through the outer edge 2b of the lower heat shield can cool the area around the bottom end of the longitudinal cooling channel 7b on the outer edge 2d of the upper heat shield, and is staggered with the gas flowing out through the outer edge 2d of the upper heat shield. The gas flowing out through the outer edge 2a of the heat shield on the right can cool the area around the end of the transverse cooling channel 6b on the outer edge 2a of the heat shield on the left, and is staggered with the gas flowing out through the outer edge 2c of the heat shield on the left. The air outlets on the outer edge 2 of adjacent heat shields are staggered, avoiding the collision of airflows. At the same time, the airflows between two adjacent heat shields can effectively prevent the intrusion of combustion gas.

[0069] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0070] The heat shield with staggered cooling channels has a high cooling efficiency. In particular, the longitudinal cooling channel is directly arranged inside the hot side wall, which can directly cool the hot surface near the hot side wall, reducing the possibility of ablation caused by local overheating. The heat shield is an integral structure and is formed by additive manufacturing or precision casting, with stable structure; at the same time, using metal materials, compared with other thermal insulation materials, such as ceramic materials, metal materials have better plasticity and fracture resistance, making the arrangement of this heat shield not limited to simple structures and areas with small curvatures.

[0071] When multiple heat shields are arranged as a thermal screen, there are gaps between adjacent heat shields, and the gas flowing out from the outer edge can further cool the outer edge of the adjacent heat shield. The air outlets on the outer edges of adjacent heat shields are staggered, so that the air flows flowing out between the outer edges of adjacent heat shields are staggered with each other, avoiding the collision of air flows while cooling the outer edges of adjacent heat shields, and the air flow between two adjacent heat shields can effectively prevent the intrusion of fuel gas.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A heat shield with staggered cooling channels for a combustion chamber, characterized in that, it includes: a hot side wall, with an outer edge connected to the periphery of the hot side wall; a cold side wall, which is arranged on one side of the hot side wall, the cold side wall is connected to the outer edge, the hot side wall, the outer edge and the cold side wall enclose a chamber, and an air inlet hole communicating with the chamber is provided on the cold side wall; transverse cooling channels, a plurality of the transverse cooling channels are longitudinally spaced on the cold surface of the hot side wall, one end of the transverse cooling channel penetrates the outer edge, the other end of the transverse cooling channel communicates with the chamber, and the flow directions of the cooling gas in two adjacent transverse cooling channels are opposite; longitudinal cooling channels, a plurality of the longitudinal cooling channels are transversely spaced inside the hot side wall, one end of the longitudinal cooling channel penetrates the outer edge, the other end of the longitudinal cooling channel communicates with the chamber, and the flow directions of the cooling gas in two adjacent longitudinal cooling channels are opposite.

2. The heat shield with staggered cooling channels for a combustion chamber according to claim 1, characterized in that, the chamber is in a shape of a square frame, a cross shape or a rectangle with a horizontal bar.

3. The heat shield with staggered cooling channels for a combustion chamber according to claim 1, characterized in that, the chamber includes a connected transverse chamber and a longitudinal chamber, a plurality of the transverse cooling channels are longitudinally spaced between two adjacent transverse chambers, and a plurality of the longitudinal cooling channels are transversely spaced between two adjacent longitudinal chambers.

4. The heat shield with staggered cooling channels for a combustion chamber according to claim 3, characterized in that, transverse cooling channels are provided on the cold surface of the hot side wall opposite to the transverse chamber, and longitudinal cooling channels are provided inside the hot side wall opposite to the longitudinal chamber.

5. The heat shield with staggered cooling channels for a combustion chamber according to claim 4, characterized in that, a mounting hole is provided in the middle of the hot side wall, and the transverse cooling channel and the longitudinal cooling channel opposite to the mounting hole are divided into two axial sections; one end of one section of the transverse cooling channel and the longitudinal cooling channel axially penetrates the outer edge, and the other end communicates with the chamber; one end of the other section of the transverse cooling channel and the longitudinal cooling channel communicates with the chamber, and the other end communicates with the mounting hole.

6. The heat shield with staggered cooling channels for a combustion chamber according to claim 1, characterized in that, the number of the air inlet holes is one or more, and the air inlet holes are round holes or polygonal holes.

7. The heat shield with staggered cooling channels for a combustion chamber according to claim 1, characterized in that, the hot side wall, the outer edge and the cold side wall are formed by additive manufacturing; or the hot side wall, the outer edge and the cold side wall are manufactured by precision casting process; or the hot side wall, the outer edge and the cold side wall are connected by welding.

8. A heat screen, comprising the heat shield with staggered cooling channels for a combustion chamber according to any one of claims 1-7, characterized in that, A plurality of the heat insulation tiles are arranged in the horizontal direction and the vertical direction, and the exhaust positions of the transverse cooling channels of two adjacent heat insulation tiles are vertically staggered on the outer edge, and the exhaust positions of the longitudinal cooling channels of two adjacent heat insulation tiles are horizontally staggered on the outer edge.

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