Hot-end force-bearing frame of air-cooled inclined support plate gas turbine

Abstract

The invention provides a hot end force bearing frame of an air-cooled inclined support plate gas turbine, and belongs to the technical field of gas turbines. A bearing seat is arranged on the inner side of the inner force bearing casing and used for forming a bearing cavity; the inclined supporting plate is connected with the outer force bearing casing and the inner force bearing casing and is a hollow air cooling supporting plate, the inclined supporting plate comprises a functional supporting plate body and a non-functional supporting plate body, the functional supporting plate body comprises an oil supply supporting plate body, an oil return supporting plate body and a sealing supporting plate body, the oil supply supporting plate body is used for allowing an oil supply pipe to penetrate through, the oil return supporting plate body is used for allowing an oil return pipe to penetrate through, and the sealing supporting plate body is used for sealing the sealing supporting plate body. The sealing support plate is used for introducing and conveying sealing bleed air, and the functional support plate and the non-functional support plate are distributed at intervals in the circumferential direction; and the cold connection pipes are connected with the two adjacent inclined supporting plates and used for conveying sealing entrained air flowing into the sealing supporting plates to the oil supply supporting plates, the oil return supporting plates, the non-functional supporting plates and the sealing cavities so as to cool the inclined supporting plates and seal the bearing cavities.

Description

Technical Field

[0001] The present application belongs to the technical field of gas turbines, and in particular relates to a hot end bearing frame of an air-cooled inclined support plate gas turbine. Background Art

[0002] The load-bearing frame is a load-bearing component of the gas turbine, used to support and transfer the load of the rotor, and transmit the rotor load from the bearing seat to the outer load-bearing casing. Usually, the load-bearing frame is composed of an outer load-bearing casing, an inner load-bearing casing, a certain number of support plates, bearing seats and sealing structures. Among them, the support plate is the main load-bearing structure passing through the main flow channel. On the premise of ensuring rigidity and stability, it also undertakes the functions of providing air bleed, oil supply / return and ventilation paths.

[0003] Affected by the temperature gradient of the mainstream airflow, the hot-end load-bearing frame needs to have corresponding thermal deformation coordination capabilities. Once local thermal deformation incoordination occurs, it may affect the concentricity of the support point and cause vibration. In severe cases, it may even cause cracks in the load-bearing frame, affecting the working safety of the gas turbine. In addition, affected by the thermal radiation of the mainstream high-temperature gas and the heat conduction of the internal load-bearing casing, the surface temperature of the bearing seat in the hot-end load-bearing frame often increases with the increase of the gas turbine operating conditions, causing the temperature of the lubricating oil medium in the bearing cavity to continue to rise, reducing the viscosity of the lubricating oil and accelerating the wear of moving pairs such as bearings and gears.

[0004] The existing hot end load-bearing frame of the gas turbine usually adopts the method of integral casting or welding of the inner and outer load-bearing casings and support plates. For engines with smaller batches, especially in the development stage, due to the high cost of integral casting per unit, high scrap rate, and easy casting defects, the inner and outer load-bearing casings and support plates are usually welded. Among them, the inclined support plate can adjust the relative thermal expansion difference of the load-bearing casing and is the first choice for the support plate form. However, due to the welded structure, the processing accuracy and dimensional stability are reduced, and it is also easy to generate welding stress, which reduces the bearing capacity of the components. In severe cases, cracks will occur, causing safety accidents.

[0005] In addition, the existing gas turbine hot end bearing frame usually uses stopper centering and bolt tightening to position the bearing seat and the inner bearing casing. When the engine is in high working condition or transition state, the temperature gradient between the inner bearing casing and the bearing seat diameter is large, and the matching stopper is easy to separate, causing the rotor support system to become unstable and cause vibration. In addition, due to the high surface temperature of the bearing seat, the lubricating oil medium in the bearing cavity is easily overheated due to thermal radiation, so there are many restrictions on the selection of lubricating oil grades. 4010 and 4050 lubricating oils with higher operating temperatures are often used, which have great limitations. Summary of the invention

[0006] The purpose of the present application is to provide an air-cooled inclined support plate gas turbine hot end bearing frame to solve or alleviate at least one problem in the background technology.

[0007] The technical solution of the present application is: an air-cooled inclined support plate gas turbine hot end bearing frame, comprising:

[0008] External bearing casing;

[0009] An inner bearing casing, wherein a bearing seat is provided inside the inner bearing casing for forming a bearing cavity;

[0010] An inclined support plate connecting the outer bearing casing and the inner bearing casing, the inclined support plate being a hollow air-cooled support plate, the inclined support plate comprising a functional support plate and a non-functional support plate, the functional support plate comprising an oil supply support plate, an oil return support plate and a sealing support plate, the oil supply support plate being used for the passage of the oil supply pipe, the oil return support plate being used for the passage of the oil return pipe, the sealing support plate being used for the introduction and transportation of sealed bleed air, the functional support plate and the non-functional support plate being distributed circumferentially and at least one non-functional support plate being arranged between two adjacent functional support plates;

[0011] A cold connecting pipe connects two adjacent inclined support plates and is used to transport the sealing air flowing into the sealing support plate to the oil supply support plate, the oil return support plate, the non-functional support plate and the sealing cavity, so as to cool the inclined support plate and seal the bearing cavity.

[0012] In an optional implementation manner of the present application, the number and type of the functional support plates are determined according to the stiffness and functional requirements of the load-bearing frame.

[0013] In an optional embodiment of the present application, the oil supply support plate has three chambers extending along the length direction of the support plate, the three chambers include a middle oil supply pipe chamber and a front chamber and a rear chamber of the oil supply support plate located at the front and rear sides of the oil supply pipe chamber, the front chamber and the rear chamber of the oil supply support plate are connected to the oil supply pipe chamber through the through hole of the oil supply support plate;

[0014] The oil supply pipe passes through the top and bottom of the oil supply pipe chamber, and the front chamber and the rear chamber of the oil supply support plate are provided with oil supply support plate cold connecting pipe installation ports, and the cold connecting pipe is installed on the oil supply support plate cold connecting pipe installation ports and connected to the adjacent non-functional support plates.

[0015] In an optional embodiment of the present application, the oil return support plate has three chambers extending along the length direction of the support plate, the three chambers include a return oil pipe chamber located in the middle and a front chamber of the return oil support plate and a rear chamber of the return oil support plate located at the front and rear sides of the return oil pipe chamber, the front chamber of the return oil support plate and the rear chamber of the return oil support plate are connected to the return oil pipe chamber through the through hole of the return oil support plate;

[0016] The return oil pipe passes through the top and bottom of the return oil pipe chamber, and the return oil support plate front chamber and the return oil support plate rear chamber are provided with return oil support plate cold coupling pipe installation ports. The cold coupling pipe is installed on the return oil support plate cold coupling pipe installation ports and connected to the adjacent non-functional support plates.

[0017] In an optional embodiment of the present application, the sealing support plate has three chambers extending along the length direction of the support plate, the three chambers include an air duct chamber located in the middle and a front chamber and a rear chamber of the sealing support plate located at the front and rear sides of the air duct chamber, the front chamber and the rear chamber of the sealing support plate are connected to the air duct chamber at the root and tip of the sealing support plate, respectively, to form a return flow channel;

[0018] The top and bottom of the air duct chamber are connected to the sealed air duct, and the front chamber of the sealed support plate and the rear chamber of the sealed support plate are provided with sealing support plate cold connecting pipe installation ports, and the cold connecting pipe is installed on the sealing support plate cold connecting pipe installation ports and connected to the adjacent non-functional support plates.

[0019] In an optional embodiment of the present application, the non-functional support plate has three chambers extending along the length direction of the support plate, the three chambers include a middle chamber and a non-functional support plate front chamber and a non-functional support plate rear chamber located at the front and rear sides of the middle chamber, the non-functional support plate front chamber and the non-functional support plate rear chamber are connected to the middle chamber at the root and tip of the non-functional support plate, respectively, to form a return flow channel;

[0020] The non-functional support plate front chamber and the non-functional support plate rear chamber are provided with non-functional support plate cold connecting pipe installation ports, and the cold connecting pipes are installed on the non-functional support plate cold connecting pipe installation ports and connected with adjacent functional support plates.

[0021] In an optional embodiment of the present application, the oil supply support plate cold connection pipe installation openings on the front chamber of the oil supply support plate and the rear chamber of the oil supply support plate are distributed on both sides of the oil supply support plate;

[0022] The installation openings of the cold connecting pipes of the oil return support plate on the front chamber of the oil return support plate and the rear chamber of the oil return support plate are distributed on both sides of the oil return support plate;

[0023] The sealing support plate cold connection pipe installation openings on the sealing support plate front chamber and the sealing support plate rear chamber are distributed on both sides of the sealing support plate;

[0024] The non-functional support plate cold connection pipe installation openings on the non-functional support plate front chamber and the non-functional support plate rear chamber are distributed on both sides of the non-functional support plate.

[0025] In an optional embodiment of the present application, the inner side of the non-functional support plate is fixed to the inner load-bearing casing via a circumferentially arranged pin, and a joint bearing is installed between the pin and the non-functional support plate.

[0026] In an optional embodiment of the present application, the outer side of the inclined support plate is fixedly connected to the outer load-bearing casing by means of a bushing for axial positioning and two radial tensioning bolts.

[0027] In an optional implementation manner of the present application, the inner load-bearing casing and the bearing seat are fixed by means of stopper centering and bolt connection.

[0028] The air-cooled inclined support plate gas turbine hot end casing load-bearing frame provided in the present application has a hollow structure and an independently disassembled inclined support plate load-bearing frame, which solves the problems of uncoordinated thermal deformation between the support plate, inner / outer bearing casing, and bearing seat, limited lubricating oil grades, and high unit cost of integral casting of the support plate and bearing casing of small batches of hot end bearing frames, high scrap rate, and easy casting defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0030] Figure 1 This is an overall schematic diagram of the load-bearing frame of the hot end casing of the air-cooled inclined support plate gas turbine of the present application.

[0031] Figure 2 Based on Figure 1 AA section diagram of the oil supply support plate installation structure.

[0032] Figure 3 Based on Figure 2 EE cross-sectional diagram of the oil supply support plate.

[0033] Figure 4 Based on Figure 1 BB section oil return support plate installation structure schematic diagram.

[0034] Figure 5 Based on Figure 1 Schematic diagram of the CC section sealing support plate installation structure.

[0035] Figure 6 Based on Figure 5 Schematic diagram of the cross section of the FF sealed support plate.

[0036] Figure 7 Based on Figure 1 DD section diagram of the non-functional support plate installation structure.

[0037] Figure 8 Based on Figure 7 Schematic diagram of the GG section of a non-functional support plate.

[0038] Reference numerals:

[0039] 100-Load-bearing frame

[0040] 1-External bearing casing

[0041] 11-Oil supply pipe

[0042] 12-Oil return pipe

[0043] 13-Seal the air duct at the pivot point

[0044] 2-Internal bearing casing

[0045] 21-Bearing seat

[0046] 22-Graphite sealing device

[0047] 23-Front sealing ring

[0048] 3- Oblique support plate

[0049] 31-Oil supply support plate

[0050] 311-Oil supply pipe chamber

[0051] 312-Front chamber of oil supply support plate

[0052] 313-Oil supply support plate rear chamber

[0053] 314-Oil supply support plate cold connection pipe installation port

[0054] 315-Oil supply support plate through hole

[0055] 32-Oil return support plate

[0056] 33-Sealing support plate

[0057] 331-Airway Chamber

[0058] 332-Seal the front chamber of the support plate

[0059] 333-Seal the rear chamber of the support plate

[0060] 334-Seal the support plate cold connection pipe installation port

[0061] 34-Non-functional support plate

[0062] 341-Middle Chamber

[0063] 342-Non-functional anterior compartment of strut

[0064] 343-Non-functional post-laminar compartment

[0065] 344-Non-functional support plate cold connection pipe installation port

[0066] 4-Cold pipe DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0068] The present application provides a gas turbine hot-end load-bearing frame with an air-cooled inclined support plate. On the one hand, it can effectively improve the thermal deformation coordination ability between the support plate, the inner / outer load-bearing casing, and the bearing seat, and can suppress the temperature level of the lubricating oil medium in the bearing cavity. On the other hand, thanks to the structure that the support plate can be independently disassembled and assembled, problems caused by welding and integral casting are avoided.

[0069] like Figures 1 to 6 As shown, the air-cooled inclined support plate gas turbine hot end casing load-bearing frame 100 provided in the present application includes: an outer load-bearing casing 1, an inner load-bearing casing 2, an inclined support plate 3 and a cold connecting pipe 4.

[0070] The outer bearing casing 1 is arranged on the outside of the inner bearing casing 2. The outer bearing casing 1 is a polygonal frame structure, and the inner bearing casing 2 is a cylindrical structure. Under the same geometric radius and the number of support plates, the polygonal outer bearing casing 1 has a stronger rigidity than the common cylindrical outer bearing casing. The outer bearing casing 1 and the inner bearing casing 2 are supported by oblique support plates 3, wherein the connection portion between the oblique support plates 3 and the outer bearing casing 1 is located in the middle of each polygon in the polygonal frame structure. The oblique support plates 3 are a group of air-cooled support plates with a hollow structure, and the number thereof can be determined according to the rigidity of the bearing frame and the functional requirements of the support plates (oil supply / return, bearing cavity ventilation, air bleed, etc.). The cold connecting pipe 4 is a double-row pipeline, which connects adjacent oblique support plates 3 and is used to introduce the sealed bleed air into the hollow structure of the remaining oblique support plates to achieve cooling of the remaining oblique support plates 3. In the illustrated embodiment of the present application, the number of oblique support plates 3 is 12.

[0071] The following embodiments of the present application are described by taking the oil supply, oil return and sealing air bleed functions as an example. It is understandable that the load-bearing frame 100 of the present application can add axial force balance flow paths, bearing cavity ventilation flow paths, etc. according to the requirements of the air system and the lubricating oil system, and adjust the number and type of functional support plates accordingly.

[0072] The load-bearing frame 100 of this embodiment of the present application includes an oil supply pipe 11, an oil return pipe 12 and a pivot sealing air bleed pipe 13, which are arranged between the outer load-bearing casing 1 and the inner load-bearing casing 2 to provide an oil supply / return channel and a sealed air bleed channel. A bearing seat 21, a graphite sealing device 22 and a front sealing ring 23 are installed on the inner side of the inner load-bearing casing 2, a bearing cavity can be formed between the bearing seat 21 and the graphite sealing device 22, and a sealing cavity can be formed between the graphite sealing device 22 and the front sealing ring 23.

[0073] The inclined support plate 3 in the present application includes a functional support plate and a non-functional support plate 34. In this embodiment of the present application, the functional support plate is divided into two types according to the structural differences of the cavity in the support plate, one is the oil supply support plate 31 and the oil return support plate 32 for supplying and returning oil, and the other is the sealing support plate 33 for air induction. Both types of support plates are hollow multi-chamber structures, and the two types of support plates are distributed along the circumferential direction, and at least one non-functional support plate 34 is arranged between adjacent functional support plates. For example, in the illustrated embodiment of the present application, two non-functional support plates 34 are arranged between two adjacent functional support plates.

[0074] like Figure 2 and Figure 3 The oil supply support plate installation structure and its cross-sectional schematic diagram in the present application are shown. The oil supply support plate 31 is provided with three chambers extending along the length direction of the support plate, namely, the oil supply pipe chamber 311 located in the middle for the oil supply pipe 11 to pass through, and the oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313 located at the front and rear sides of the oil supply pipe chamber 311. The oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313 are connected to the oil supply pipe chamber 311 through the oil supply support plate through hole 315. The oil supply support plate cold connection pipe installation port 314 is provided on the oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313. The cold connection pipe 4 is installed on the oil supply support plate cold connection pipe installation port 314 and connected to the adjacent non-functional support plate to achieve circumferential mutual communication of the support plates. The cold air flows from the cooling connecting pipe 4 into the front chamber 312 and the rear chamber 313 of the oil supply support plate, passes through the through hole 315 of the oil supply support plate and enters the oil supply pipe chamber 311, cools the oil supply pipe 11 in the oil supply pipe chamber 311, and then flows along the oil supply pipe chamber 311 to the outer cavity of the bearing seat.

[0075] The oil supply support plate 31 of the present application utilizes a cold air channel to achieve support plate cooling, improve the working environment, increase structural stability and service life, and coordinate the deformation between the inner and outer load-bearing casings and the support plate. The middle oil supply pipe chamber 311 is physically isolated from the front and rear chambers by partition ribs, providing an oil supply channel to achieve the bearing cavity oil supply function. The oil supply pipe chamber 311 is connected to the outer cavity of the bearing seat 21, and the multiple groups of oil supply support plate through holes 315 arranged on the partition ribs form impact cold air holes, which reduce the temperature level of the pipeline in the middle oil supply pipe chamber 311 while forming a cooling air film wrapped around the outer periphery of the bearing seat 21, thereby achieving cooling and temperature uniformity of the lubricating oil medium in the bearing cavity.

[0076] In the preferred embodiment of the present application, the oil supply support plate cold connection pipe installation openings 314 on the front chamber 312 of the oil supply support plate and the rear chamber 313 of the oil supply support plate are distributed on both sides of the oil supply support plate.

[0077] like Figure 4The schematic diagram of the installation structure of the oil return support plate in the present application is shown. The structure of the oil return support plate 32 is the same as that of the oil supply support plate 31. The interior of the oil return support plate 32 is provided with three chambers extending along the length direction of the support plate, namely, the oil return pipe chamber located in the middle for the oil return pipe 12 to pass through, and the front chamber of the oil return support plate and the rear chamber of the oil return support plate located on the front and rear sides of the oil return pipe chamber. The front chamber of the oil return support plate and the rear chamber of the oil return support plate are connected to the oil return pipe chamber through the through hole of the oil return support plate. The front chamber of the oil return support plate and the rear chamber of the oil return support plate are both provided with a return oil support plate cold connection pipe installation port. The cold connection pipe 4 is installed on the return oil support plate cold connection pipe installation port and connected to the adjacent non-functional support plate to achieve circumferential interconnection of the support plates. The cold air flows into the front chamber and the rear chamber of the oil return support plate from the cooling connecting pipe 4, enters the oil return pipe chamber after passing through the through hole of the oil return support plate, cools the oil return pipe 12 in the oil return pipe chamber, and then flows along the oil return pipe chamber to the outer cavity of the bearing seat, forming a cooling air film that wraps around the periphery of the bearing seat, thereby achieving cooling and uniform temperature of the lubricating oil medium in the bearing cavity.

[0078] like Figure 5 and Figure 6 The sealing support plate installation structure and its cross-sectional schematic diagram in the present application are shown. The sealing support plate 33 has three chambers extending along the length direction of the support plate inside, namely, the air duct chamber 331 and the sealing support plate front chamber 332 and the sealing support plate rear chamber 333 located at the front and rear sides of the air duct chamber 331. The sealing support plate front chamber 332 and the sealing support plate rear chamber 333 are connected to the air duct chamber 331 at the root and tip of the sealing support plate, respectively, so as to form a return flow channel. The top and bottom of the air duct chamber 331 are connected to the sealing air duct 13. The sealing support plate front chamber 332 and the sealing support plate rear chamber 333 are both provided with sealing support plate cold connection pipe installation ports 334. The cold connection pipe 4 is installed on the sealing support plate cold connection pipe installation ports 334 and connected to the adjacent non-functional support plates, so as to realize the circumferential interconnection of the support plates. The cooling air introduced through the sealed air duct 13 flows along a part of the air duct chamber 331 to the front chamber 332 and the rear chamber 333 of the sealed support plate on both sides, and then flows into the cold connecting pipe 4; the other part flows into the sealed cavity from the sealed air duct 13 at the bottom of the air duct chamber 331.

[0079] The sealing support plate 33 of the present application uses a return flow channel to achieve cooling of the support plate and coordinate the deformation between the inner and outer load-bearing casings and the support plate. A step hole is set at the bottom of the middle air bleed pipe chamber 331 for installing the sealing air bleed pipe 13 to achieve the sealing chamber air bleed function.

[0080] In the preferred embodiment of the present application, the sealing support plate cold connection pipe installation openings 334 on the front chamber 332 of the sealing support plate and the rear chamber 333 of the sealing support plate are distributed on both sides of the sealing support plate.

[0081] like Figure 7 and Figure 8The non-functional support plate installation structure and its cross-sectional schematic diagram in the present application are shown. The other sealing support plates 33 are similar in structure, except that the middle chamber of the non-functional support plate does not provide a pipeline passage. Specifically, the interior of the non-functional support plate has three chambers extending along the length direction of the support plate, namely, the middle chamber 341 and the non-functional support plate front chamber 342 and the non-functional support plate rear chamber 343 located on the front and rear sides of the middle chamber 341. The non-functional support plate front chamber 342 and the non-functional support plate rear chamber 343 are connected to the middle chamber 341 at the root and tip of the support plate, respectively, so as to form a return flow channel. The non-functional support plate front chamber 342 and the non-functional support plate rear chamber 343 are both provided with a non-functional support plate cold connection pipe installation port 344. The cold connection pipe 4 is installed on the non-functional support plate cold connection pipe installation port 344 and connected to the adjacent functional support plate to realize the circumferential interconnection of the support plates.

[0082] The non-functional support plate 34 of the present application utilizes the return flow channel inside the support plate to achieve support plate cooling and coordinate the deformation between the inner and outer load-bearing casings and the support plate. Compared with the functional support plate, the chamber does not provide a pipeline channel, but is connected to the front and rear chambers.

[0083] In a preferred embodiment of the present application, the non-functional support plate cold connection pipe installation openings 344 on the non-functional support plate front chamber 342 and the non-functional support plate rear chamber 343 are distributed on both sides of the non-functional support plate.

[0084] In addition, the non-functional support plate 34 in the present application is a group of independently detachable support plates. The inner side of each non-functional support plate 34 uses two circumferentially arranged pins 14 to fix the non-functional support plate 35 on the inner load-bearing casing 2. A joint bearing 15 is installed between the pin 14 and the non-functional support plate 35 to eliminate the "competition" between the inner and outer load-bearing casings caused by the uncoordinated thermal deformation, thereby reducing the risk of cracks or even breakage of the support plate due to stress concentration.

[0085] In the present application, the outer side of each inclined support plate 3 is fixedly connected to the outer bearing casing 1 through an axial positioning bushing 16 and two radial tension bolts 17. The structure that the inclined support plate 3 can be independently disassembled and assembled avoids the welding stress caused by welding the inclined support plate 3 and the bearing casing of the welded structure, and the problems of high cost per unit, high scrap rate, and easy casting defects caused by integral casting of the inclined support plate 3 and the bearing casing of the integral casting structure.

[0086] In some embodiments of the present application, the bearing seat 21 and the inner bearing casing 2 are connected by means of stopper centering and bolt tightening. The stopper ensures the assembly quality during cold installation. In high working conditions or transitional states, the stopper mating surfaces of the inner bearing casing 2 and the bearing seat 21 benefit from the cooling airflow in the middle chamber of the supply / return oil support plate, and are not easy to separate, which invisibly improves the stability of the rotor support system and ensures stable and reliable centering under the working state of the engine. At the same time, the bearing seat 21 and the bearing outer ring 211 are selected as much as possible with the same or similar linear expansion coefficient materials to reduce the deformation incompatibility between the bearing seat 21 and the bearing outer ring 211.

[0087] The air-cooled inclined support plate gas turbine hot end casing load-bearing frame provided in the present application has a hollow structure and an independently disassembled inclined support plate load-bearing frame, which solves the problems of uncoordinated thermal deformation between the support plate, inner / outer bearing casing, and bearing seat, limited lubricating oil grades, and high unit cost of integral casting of the support plate and bearing casing of small batches of hot end bearing frames, high scrap rate, and easy casting defects.

[0088] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An air-cooled inclined support plate gas turbine hot end bearing frame, characterized in that: include: External bearing casing; An inner bearing casing, wherein a bearing seat is provided inside the inner bearing casing for forming a bearing cavity; An inclined support plate connecting the outer bearing casing and the inner bearing casing, the inclined support plate being a hollow air-cooled support plate, the inclined support plate comprising a functional support plate and a non-functional support plate, the functional support plate comprising an oil supply support plate, an oil return support plate and a sealing support plate, the oil supply support plate being used for the passage of the oil supply pipe, the oil return support plate being used for the passage of the oil return pipe, the sealing support plate being used for the introduction and transportation of sealed bleed air, the functional support plate and the non-functional support plate being distributed circumferentially and at least one non-functional support plate being arranged between two adjacent functional support plates; A cold connecting pipe connects two adjacent inclined support plates and is used to transport the sealing air flowing into the sealing support plate to the oil supply support plate, the oil return support plate, the non-functional support plate and the sealing cavity, so as to cool the inclined support plate and seal the bearing cavity.

2. The hot end bearing frame of the air-cooled inclined support plate gas turbine according to claim 1, characterized in that: The number and type of the functional support plates are determined according to the rigidity and functional requirements of the load-bearing frame.

3. The hot end bearing frame of the air-cooled inclined support plate gas turbine according to claim 1, characterized in that: The oil supply support plate has three chambers extending along the length direction of the support plate, the three chambers include a central oil supply pipe chamber and a front chamber and a rear chamber of the oil supply support plate located at the front and rear sides of the oil supply pipe chamber, the front chamber and the rear chamber of the oil supply support plate being connected to the oil supply pipe chamber through the through hole of the oil supply support plate; The oil supply pipe passes through the top and bottom of the oil supply pipe chamber, and the front chamber and the rear chamber of the oil supply support plate are provided with oil supply support plate cold connecting pipe installation ports, and the cold connecting pipe is installed on the oil supply support plate cold connecting pipe installation ports and connected to the adjacent non-functional support plates.

4. The hot end bearing frame of the air-cooled inclined support plate gas turbine according to claim 3, characterized in that: The oil return support plate has three chambers extending along the length direction of the support plate, the three chambers include a return oil pipe chamber located in the middle and a front chamber and a rear chamber of the return oil support plate located at the front and rear sides of the return oil pipe chamber, the front chamber and the rear chamber of the return oil support plate are connected to the return oil pipe chamber through the through hole of the return oil support plate; The return oil pipe passes through the top and bottom of the return oil pipe chamber, and the return oil support plate front chamber and the return oil support plate rear chamber are provided with return oil support plate cold coupling pipe installation ports. The cold coupling pipe is installed on the return oil support plate cold coupling pipe installation ports and connected to the adjacent non-functional support plates.

5. The hot end bearing frame of the air-cooled inclined support plate gas turbine according to claim 4, characterized in that: The sealing support plate has three chambers extending along the length direction of the support plate, the three chambers include an air duct chamber located in the middle and a front chamber and a rear chamber of the sealing support plate located at the front and rear sides of the air duct chamber. The front chamber and the rear chamber of the sealing support plate are connected to the air duct chamber at the root and the tip of the sealing support plate, respectively, to form a return flow channel; The top and bottom of the air duct chamber are connected to the sealed air duct, and the front chamber of the sealed support plate and the rear chamber of the sealed support plate are provided with sealing support plate cold connecting pipe installation ports, and the cold connecting pipe is installed on the sealing support plate cold connecting pipe installation ports and connected to the adjacent non-functional support plates.

6. The hot end bearing frame of the air-cooled inclined plate gas turbine according to claim 5, characterized in that: The non-functional support plate has three chambers extending along the length direction of the support plate inside, and the three chambers include a middle chamber and a non-functional support plate front chamber and a non-functional support plate rear chamber located at the front and rear sides of the middle chamber, and the non-functional support plate front chamber and the non-functional support plate rear chamber are connected with the middle chamber at the root and the tip of the non-functional support plate, respectively, so as to form a return flow channel; The non-functional support plate front chamber and the non-functional support plate rear chamber are provided with non-functional support plate cold connecting pipe installation ports, and the cold connecting pipes are installed on the non-functional support plate cold connecting pipe installation ports and connected with adjacent functional support plates.

7. The hot end bearing frame of the air-cooled inclined plate gas turbine according to claim 6, characterized in that: The installation openings of the cold connecting pipes of the oil supply support plate on the front chamber of the oil supply support plate and the rear chamber of the oil supply support plate are distributed on both sides of the oil supply support plate; The installation openings of the cold connecting pipes of the oil return support plate on the front chamber of the oil return support plate and the rear chamber of the oil return support plate are distributed on both sides of the oil return support plate; The sealing support plate cold connection pipe installation openings on the sealing support plate front chamber and the sealing support plate rear chamber are distributed on both sides of the sealing support plate; The non-functional support plate cold connection pipe installation openings on the non-functional support plate front chamber and the non-functional support plate rear chamber are distributed on both sides of the non-functional support plate.

8. The hot end bearing frame of the air-cooled inclined support plate gas turbine according to claim 6 or 7, characterized in that: The inner side of the non-functional support plate is fixed to the inner load-bearing casing through a circumferentially arranged pin shaft, and a joint bearing is installed between the pin shaft and the non-functional support plate.

9. The hot end bearing frame of the air-cooled inclined plate gas turbine according to claim 8, characterized in that: The outer side of the inclined support plate is fixedly connected to the outer load-bearing casing through a bushing for axial positioning and two radial tension bolts.

10. The hot end bearing frame of the air-cooled inclined plate gas turbine according to claim 9, characterized in that: The inner load-bearing casing and the bearing seat are fixed by means of stopper centering and bolt connection.

Images