Air-cooled straight-shaft plate gas turbine hot end bearing frame

Abstract

The application provides a gas-cooled straight support plate gas turbine hot end load-bearing frame, and belongs to the technical field of gas turbines. The load-bearing frame comprises an outer load-bearing casing, an inner load-bearing casing, a bearing seat arranged on the inner side of the inner load-bearing casing and used for forming a bearing cavity, a straight support plate connected to the outer load-bearing casing and the inner load-bearing casing, a hollow air-cooled support plate, functional support plates and non-functional support plates, oil supply support plates, oil return support plates and sealing support plates, the oil supply support plates are used for the passing of oil supply pipes, the oil return support plates are used for the passing of oil return pipes, the sealing support plates are used for the introduction and transportation of sealing air, the functional support plates and the non-functional support plates are distributed in a circumferential interval, and a cold connection pipe is connected to two adjacent straight support plates and used for transporting sealing air flowing into the sealing support plates to the oil supply support plates, the oil return support plates, the non-functional support plates and a sealing cavity, so as to cool the straight support plates and seal the bearing cavity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas turbines, and particularly relates to a hot-end load-bearing frame of an air-cooled straight support plate gas turbine. BACKGROUND

[0002] As a load-bearing component of a gas turbine, the load-bearing frame is used to support and transfer the load of the rotor, and to transfer the load of the rotor from the bearing seat to the outer load-bearing casing. The load-bearing frame is usually composed of an outer load-bearing casing, an inner load-bearing casing, a certain number of support plates, a bearing seat, and a sealing structure, etc. The support plate, as the main load-bearing structure passing through the main flow passage, not only ensures rigidity and stability, but also provides air induction, oil supply and return, and ventilation paths.

[0003] Affected by the temperature gradient of the main flow passage, the hot-end load-bearing frame needs to have corresponding thermal deformation coordination capability. Once local thermal deformation is not coordinated, it may affect the bearing point concentricity and thus cause vibration. In severe cases, it may even cause cracks in the load-bearing frame, affecting the safe operation of the gas turbine. In addition, affected by the high-temperature gas heat radiation of the main flow and the heat conduction of the inner load-bearing casing, the surface temperature of the bearing seat in the hot-end load-bearing frame often rises with the increase of the working condition of the gas turbine, causing the temperature of the lubricating oil medium in the bearing cavity to continuously rise, reducing the viscosity of the lubricating oil, and accelerating the wear of the bearings, gears and other moving pairs.

[0004] The existing hot-end load-bearing frame of a gas turbine usually adopts the mode of integral casting or welding processing of the inner and outer load-bearing casings and the support plates. For small-batch engines, especially in the development stage, due to the high cost, high scrap rate and easy casting defects of integral casting, the inner and outer load-bearing casings and the support plates are usually welded together. The inclined support plate can adjust the relative thermal expansion difference of the load-bearing casing, and is the first choice of support plate form. However, since it is a welded structure, the machining precision and dimensional stability are reduced, and welding stress is also easy to produce, which reduces the load-carrying capacity of the component, and in severe cases, cracks may occur, causing safety accidents.

[0005] In addition, the bearing seat and the inner load-bearing casing of the existing hot-end load-bearing frame of a gas turbine are usually positioned by a stop centering and bolt tightening. When the gas turbine is in a high working condition or a transition state, the temperature gradient of the inner load-bearing casing and the bearing seat is large, and the matching stop port is easy to separate, causing instability of the rotor support system and vibration. In addition, due to the high surface temperature of the bearing seat, the lubricating oil medium in the bearing cavity is easy to overheat due to the influence of heat radiation, so there are many limitations in the selection of lubricating oil grades, and high-temperature 4010 and 4050 lubricating oils are often used, which has great limitations. SUMMARY

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

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

[0008] An outer load-bearing casing;

[0009] An inner load-bearing casing, an inner side of the inner load-bearing casing being provided with a bearing seat for forming a bearing cavity;

[0010] A straight support plate connecting the outer load-bearing casing and the inner load-bearing casing, the straight support plate being a hollow air-cooled support plate, the straight support plate comprising functional support plates and non-functional support plates, the functional support plates comprising oil supply support plates, oil return support plates and sealing support plates, the oil supply support plates being used for the passing of oil supply pipes, the oil return support plates being used for the passing of oil return pipes, the sealing support plates being used for the introduction and transportation of sealing bleed air, the functional support plates and the non-functional support plates being distributed in a circumferential interval;

[0011] A cold link pipe connecting two adjacent straight support plates, used for transporting the sealing bleed air flowing into the sealing support plates to the oil supply support plates, the oil return support plates, the non-functional support plates and a sealing cavity, so as to cool the straight support plates and seal the bearing cavity.

[0012] In the optional embodiment 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 the optional embodiment of the present application, the oil supply support plate has three chambers extending along the length direction of the support plate inside, the three chambers comprising an oil supply pipe chamber in the middle and an oil supply support plate front chamber and an oil supply support plate rear chamber on the front and rear sides of the oil supply pipe chamber, the oil supply support plate front chamber and the oil supply support plate rear chamber being communicated with the oil supply pipe chamber through oil supply support plate through holes;

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

[0015] In the optional embodiment of the present application, the oil return support plate has three chambers extending along the length direction of the support plate inside, the three chambers comprising an oil return pipe chamber in the middle and an oil return support plate front chamber and an oil return support plate rear chamber on the front and rear sides of the oil return pipe chamber, the oil return support plate front chamber and the oil return support plate rear chamber being communicated with the oil return pipe chamber through oil return support plate through holes;

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

[0017] In the alternative embodiment of the present application, the inner side of the seal support plate has three chambers extending along the length of the support plate, including a middle chamber of the bleed pipe and a front chamber and a rear chamber of the seal support plate on both sides of the middle chamber of the bleed pipe, the front chamber and the rear chamber of the seal support plate are communicated with the middle chamber of the bleed pipe at the root and the tip of the seal support plate, thereby forming a turn-back flow channel.

[0018] The top and bottom of the middle chamber of the bleed pipe are connected with the seal bleed pipe, the front chamber and the rear chamber of the seal support plate are provided with seal support plate cold connection pipe installation openings, and the cold connection pipe is installed on the seal support plate cold connection pipe installation openings to be connected with the adjacent non-functional support plate.

[0019] In the alternative embodiment of the present application, the inner side of the non-functional support plate has three chambers extending along the length of the support plate, including a middle chamber and a front chamber and a rear chamber of the non-functional support plate on both sides of the middle chamber, the front chamber and the rear chamber of the non-functional support plate are communicated with the middle chamber at the root and the tip of the non-functional support plate, thereby forming a turn-back flow channel.

[0020] The front chamber and the rear chamber of the non-functional support plate are provided with non-functional support plate cold connection pipe installation openings, and the cold connection pipe is installed on the non-functional support plate cold connection pipe installation openings to be connected with the adjacent functional support plate.

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

[0022] The oil return support plate cold connection pipe installation openings on the front chamber and the rear chamber of the oil return support plate are distributed on both sides of the oil return support plate.

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

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

[0025] In the alternative embodiment of the present application, the inner side of the non-functional support plate is fixed on the inner force casing through the circumferentially arranged pin shaft, and a joint bearing is installed between the pin shaft and the non-functional support plate.

[0026] In the alternative embodiment of the present application, the outer side of the straight support plate is fixedly connected with the outer force casing through one bushing shaft for axial positioning and two radial tension bolts.

[0027] In an optional embodiment of this application, the inner load-bearing casing and the bearing seat are fixed by means of centering with a stop and bolt connection.

[0028] The air-cooled straight-support plate gas turbine hot-end casing support frame provided in this application has a hollow structure and can be independently disassembled and assembled. It solves the problems of thermal deformation incoordination between the support plate, inner / outer load-bearing casing, and bearing seat, limited lubricating oil grade, and high cost, high scrap rate, and easy casting defects of the support plate and load-bearing casing of small batch hot-end support frames when they are cast as a whole. Attached Figure Description

[0029] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0030] Figure 1 This is a schematic diagram of the overall load-bearing frame of the hot end casing of the air-cooled straight-plate gas turbine of this application.

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

[0032] Figure 3 Based on Figure 2 Schematic diagram of the EE section of the oil supply support plate.

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

[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 FF section of the sealed support plate.

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

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

[0038] Figure label:

[0039] 100-Bearing Frame

[0040] 1-External load-bearing casing

[0041] 11-Oil supply pipe

[0042] 12-oil return pipe

[0043] 13-pivot seal gas guide pipe

[0044] 2-inner bearing housing

[0045] 21-bearing seat

[0046] 22-graphite seal device

[0047] 23-front seal ring

[0048] 3-straight support plate

[0049] 31-oil supply support plate

[0050] 311-oil supply pipe chamber

[0051] 312-oil supply support plate front chamber

[0052] 313-oil supply support plate rear chamber

[0053] 314-oil supply support plate cold link pipe mounting port

[0054] 315-oil supply support plate through hole

[0055] 32-oil return support plate

[0056] 33-seal support plate

[0057] 331-gas guide pipe chamber

[0058] 332-seal support plate front chamber

[0059] 333-seal support plate rear chamber

[0060] 334-seal support plate cold link pipe mounting port

[0061] 34-non-functional support plate

[0062] 341-middle chamber

[0063] 342-non-functional support plate front chamber

[0064] 343-non-functional support plate rear chamber

[0065] 344-non-functional support plate cold link pipe mounting port

[0066] 4-cold link pipe DETAILED DESCRIPTION

[0067] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

[0068] The application provides a gas-cooled straight support plate gas turbine hot-end force frame, which can effectively improve the thermal deformation coordination capability among the support plate, inner / outer force casings and bearing seat, and can inhibit the temperature level of the sliding oil medium in the bearing cavity.

[0069] As shown in the drawings, Figures 1 to 6 The application provides a gas-cooled straight support plate gas turbine hot-end force frame 100, which comprises an outer force casing 1, an inner force casing 2, a straight support plate 3 and a cold link pipe 4.

[0070] The outer force casing 1 is arranged outside the inner force casing 2, and both are cylindrical structures. The outer force casing 1 and the inner force casing 2 are supported by the straight support plate 3. The straight support plate 3 is a group of hollow structure gas-cooled support plates, and the number thereof can be determined according to the stiffness of the force frame and the functional requirements (oil supply / oil return, bearing cavity ventilation, air induction, etc.) of the support plates. The cold link pipe 4 is a double-row pipeline, which connects adjacent straight support plates 3 and is used for introducing sealing air into the hollow structures of the remaining straight support plates 3 to achieve cooling of the remaining straight support plates 3. In the embodiment of the application, the number of straight support plates 3 is 8.

[0071] The application is described by taking the functions of oil supply, oil return and sealing air induction as examples in the following embodiments. It can be understood that the force frame 100 of the application can increase axial force balance flow paths, bearing cavity ventilation flow paths and the like according to the requirements of the air system and the sliding oil system, and the number and types of functional support plates can be adjusted accordingly.

[0072] The force frame 100 of the embodiment of the application comprises an oil supply pipe 11, an oil return pipe 12 and a fulcrum sealing air pipe 13, which are arranged between the outer force casing 1 and the inner force casing 2 to provide oil supply / oil return channels and sealing air channels. The inner side of the inner force casing 2 is provided with a bearing seat 21, a graphite sealing device 22 and a front sealing ring 23. The bearing seat 21 and the graphite sealing device 22 can form a bearing cavity therebetween, and the graphite sealing device 22 and the front sealing ring 23 can form a sealing cavity therebetween.

[0073] The straight support plate 3 in the application comprises functional support plates and non-functional support plates, and both types of support plates are hollow multi-chamber structures and are alternately distributed in the circumferential direction. In the embodiment of the application, the functional support plates are divided into two types according to the structural differences of the internal cavities of the support plates. One type is an oil supply support plate 31 and an oil return support plate 32 for oil supply and oil return, and the other type is a sealing support plate 33 for air induction.

[0074] As shown in the drawings, Figure 2 and Figure 3The oil supply support plate 31 is internally provided with three chambers extending along the length direction of the support plate, i.e. an oil supply pipe chamber 311 in the middle for the oil supply pipe 11 to pass through, and an oil supply support plate front chamber 312 and an oil supply support plate rear chamber 313 located on the two 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 in communication with the oil supply pipe chamber 311 through oil supply support plate through holes 315. The oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313 are each provided with an oil supply support plate cold joint pipe mounting hole 314, and the cold joint pipe 4 is mounted on the oil supply support plate cold joint pipe mounting hole 314 to be connected with the adjacent non-functional support plate, so as to realize the circumferential mutual communication of the support plates. The cold gas flows into the oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313 from the cold joint pipe 4, enters the oil supply pipe chamber 311 through the oil supply support plate through holes 315, cools the oil supply pipe 11 in the oil supply pipe chamber 311, and then flows into the bearing seat outer cavity along the oil supply pipe chamber 311.

[0075] The oil supply support plate 31 of the present application utilizes the cold gas passage to realize support plate cooling, improves the working environment, improves the structural stability and service life, and coordinates the deformation coordination between the inner and outer force casings and the support plate. The middle oil supply pipe chamber 311 is physically isolated from the front and rear chambers by the partition rib, provides an oil supply passage, and realizes the bearing cavity oil supply function. The oil supply pipe chamber 311 is in communication with the outer cavity of the bearing seat 21, and the multiple groups of oil supply support plate through holes 315 provided on the partition rib form impact cold gas holes, which reduce the pipeline temperature level in the middle oil supply pipe chamber 311 and form a cooling gas film wrapped around the bearing seat 21 periphery, so as to realize the cooling and uniform temperature of the bearing cavity oil medium.

[0076] In the preferred embodiment of the present application, the oil supply support plate cold joint pipe mounting holes 314 on the oil supply support plate front chamber 312 and the oil supply support plate rear chamber 313 are distributed on the two sides of the oil supply support plate.

[0077] As Figure 4The diagram shows the installation structure of the return oil support plate in this application. The return oil support plate 32 has the same structure as the supply oil support plate 31. The return oil support plate 32 has three chambers extending along its length: a return oil pipe chamber in the middle for the return oil pipe 12 to pass through, and a front and rear chamber located on either side of the return oil pipe chamber. The front and rear chambers are connected to the return oil pipe chamber through through holes in the return oil support plate. Both the front and rear chambers have cold connection pipe installation ports. The cold connection pipe 4 is installed on these ports and connects to adjacent non-functional support plates, achieving circumferential interconnection between the support plates. Cold air flows from the cold connecting pipe 4 into the front chamber and rear chamber of the return oil support plate. After passing through the through hole of the return oil support plate, it enters the return oil pipe chamber, cools the return oil pipe 12 in the return oil pipe chamber, and then flows along the return oil pipe chamber to the outer cavity of the bearing housing, forming a cooling air film that wraps around the bearing housing, thereby achieving uniform cooling of the lubricating oil medium in the bearing cavity.

[0078] like Figure 5 and Figure 6 The diagram shows the sealing support plate installation structure and its cross-sectional view in this application. The sealing support plate 33 has three chambers extending along the length of the support plate: the air intake pipe chamber 331 and the sealing support plate front chamber 332 and sealing support plate rear chamber 333 located on the front and rear sides of the air intake pipe chamber 331. The sealing support plate front chamber 332 and sealing support plate rear chamber 333 are connected to the air intake pipe chamber 331 at the root and tip of the sealing support plate, respectively, thus forming a zigzag flow channel. The top and bottom of the air intake pipe chamber 331 are connected to the sealing air intake pipe 13. The sealing support plate front chamber 332 and 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 port 334 and connected to the adjacent non-functional support plate to realize the circumferential interconnection of the support plates. The cooling air introduced through the sealed air intake pipe 13 flows along the air intake pipe 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 connection pipe 4; the other part flows into the sealed chamber from the sealed air intake pipe 13 at the bottom of the air intake pipe chamber 331.

[0079] The sealing support plate 33 of this application utilizes a folded 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. The bottom of the intermediate air venting chamber 331 is provided with a stepped hole for installing the sealing air venting pipe 13 to realize the air venting function of the sealing chamber.

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

[0081] Such as 7 and Figure 8The non-functional support plate installation structure and its cross-sectional schematic diagram in the application are shown. The remaining sealing support plate 33 structure is similar, except that the middle chamber of the non-functional support plate does not provide a pipeline passage. Specifically, the non-functional support plate has three chambers extending along the length direction of the support plate, i.e., a middle chamber 341 and a non-functional support plate front chamber 342 and a 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 respectively communicated with the middle chamber 341 at the support plate root and the tip, thereby forming a turn-back flow channel. The non-functional support plate front chamber 342 and the non-functional support plate rear chamber 343 are each provided with a non-functional support plate cold joint pipe installation port 344. The cold joint pipe 4 is installed on the non-functional support plate cold joint pipe installation port 344 and connected with the adjacent functional support plate, so as to realize the circumferential mutual communication of the support plates.

[0082] The non-functional support plate 34 of the application utilizes the turn-back flow channel in the support plate to realize support plate cooling and coordinate the deformation coordination between the inner and outer force casings and the support plate. Compared with the functional support plate, the middle chamber of the non-functional support plate does not provide a pipeline passage, but is communicated with the front and rear chambers.

[0083] In the preferred embodiment of the application, the non-functional support plate cold joint pipe installation ports 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 application is a group of independent detachable support plates. The inner side of each non-functional support plate 34 is fixed to the inner force casing 2 by 2 circumferentially arranged pin shafts 14. A joint bearing 15 is installed between the pin shaft 14 and the non-functional support plate 35, so as to eliminate the "fighting" condition of the inner and outer force casings caused by the uncoordinated thermal deformation, thereby reducing the risk of cracks or even fracture of the support plate due to stress concentration.

[0085] In the application, the outer side of each straight support plate 3 is fixedly connected with the outer force casing 1 through 1 axial positioning bushing 16 and 2 radial tension bolts 17. The independent detachable structure of the straight support plate 3 avoids the welding stress caused by the welding of the welded structure straight support plate 3 and the force casing, and overcomes the problems of high single unit cost, high scrap rate and easy casting defects of the integral casting structure straight support plate 3 and the force casing.

[0086] In some embodiments of the present application, the bearing seat 21 and the inner force bearing casing 2 are connected by a way of stop port centering and screw tightening. The stop port ensures the assembly quality in cold assembly. In high working conditions or transition state, the stop port matching surface of the inner force bearing casing 2 and the bearing seat 21 is not easy to separate due to the cooling airflow of the middle chamber of the oil supply and return support plate, thereby improving the stability of the rotor support system and ensuring the centering stability and reliability in the working state of the gas turbine. At the same time, the bearing seat 21 and the bearing outer ring 211 are made of materials with similar linear expansion coefficients as much as possible to reduce the deformation incoordination between the bearing seat 21 and the bearing outer ring 211.

[0087] The air-cooled straight support plate gas turbine hot-end casing force bearing frame provided by the present application has a hollow structure and a straight support plate force bearing frame that can be independently disassembled, and solves the problems of thermal deformation incoordination between the support plate, the inner / outer force bearing casing and the bearing seat, the limitation of oil grade, and the problems of high cost, high scrap rate and easy casting defects of the integral casting of the support plate and the force bearing casing of the small-batch hot-end force bearing frame.

[0088] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air-cooled direct-brushplate gas turbine hot end load frame, characterized by, The application relates to a bearing frame for a gas turbine engine, which comprises: an outer bearing frame; an inner bearing frame, which is internally provided with a bearing seat for forming a bearing cavity; a straight support plate connecting the outer bearing frame and the inner bearing frame, the straight support plate being a hollow air-cooling support plate, the straight support plate comprising functional support plates and non-functional support plates, the functional support plates comprising oil supply support plates, oil return support plates and sealing support plates, the oil supply support plates being used for the penetration of oil supply pipes, the oil return support plates being used for the penetration of oil return pipes, and the sealing support plates being used for the introduction and transportation of sealing air, the functional support plates and the non-functional support plates being distributed in a circumferential interval; a cold connection pipe connecting two adjacent straight support plates, which is used for transporting sealing air flowing into the sealing support plates to the oil supply support plates, the oil return support plates, the non-functional support plates and a sealing cavity, so as to cool the straight support plates and seal the bearing cavity.

2. The air-cooled direct-brushed gas turbine hot end bearing frame of claim 1, wherein, The number and type of the functional support plates are determined according to the rigidity and functional requirements of the bearing frame.

3. The air-cooled direct Brayton gas turbine hot end load frame of claim 1 wherein, The oil supply support plate is internally provided with three chambers extending along the length direction of the support plate, the three chambers comprising an oil supply pipe chamber in the middle and an oil supply support plate front chamber and an oil supply support plate rear chamber on the two sides of the oil supply pipe chamber, the oil supply support plate front chamber and the oil supply support plate rear chamber being communicated with the oil supply pipe chamber through oil supply support plate through holes; the oil supply pipe penetrating the top and bottom of the oil supply pipe chamber, the oil supply support plate front chamber and the oil supply support plate rear chamber being provided with oil supply support plate cold connection pipe mounting ports, and the cold connection pipe being mounted on the oil supply support plate cold connection pipe mounting ports and connected with adjacent non-functional support plates.

4. The air-cooled direct Brayton gas turbine hot end load frame of claim 3, wherein, The oil return support plate is internally provided with three chambers extending along the length direction of the support plate, the three chambers comprising an oil return pipe chamber in the middle and an oil return support plate front chamber and an oil return support plate rear chamber on the two sides of the oil return pipe chamber, the oil return support plate front chamber and the oil return support plate rear chamber being communicated with the oil return pipe chamber through oil return support plate through holes; the oil return pipe penetrating the top and bottom of the oil return pipe chamber, the oil return support plate front chamber and the oil return support plate rear chamber being provided with oil return support plate cold connection pipe mounting ports, and the cold connection pipe being mounted on the oil return support plate cold connection pipe mounting ports and connected with adjacent non-functional support plates.

5. The air-cooled direct Brayton gas turbine hot end load frame of claim 4 wherein, The sealing support plate is internally provided with three chambers extending along the length direction of the support plate, the three chambers comprising an air pipe chamber in the middle and a sealing support plate front chamber and a sealing support plate rear chamber on the two sides of the air pipe chamber, the sealing support plate front chamber and the sealing support plate rear chamber being communicated with the air pipe chamber at the root and the tip of the sealing support plate respectively, so as to form a turn-back flow channel; the top and bottom of the air pipe chamber being connected with a sealing air pipe, the sealing support plate front chamber and the sealing support plate rear chamber being provided with sealing support plate cold connection pipe mounting ports, and the cold connection pipe being mounted on the sealing support plate cold connection pipe mounting ports and connected with adjacent non-functional support plates.

6. The air-cooled direct Brayton gas turbine hot end load frame of claim 5 wherein, The non-functional support plate is internally provided with three chambers extending along the length direction of the support plate, the three chambers comprising a middle chamber and a non-functional support plate front chamber and a non-functional support plate rear chamber on the two sides of the middle chamber, the non-functional support plate front chamber and the non-functional support plate rear chamber being communicated with the middle chamber at the root and the tip of the non-functional support plate respectively, so as to form a turn-back flow channel. The non-functional branch plate front chamber and the non-functional branch plate rear chamber are provided with non-functional branch plate cold connection pipe installation openings, and the cold connection pipe is installed on the non-functional branch plate cold connection pipe installation openings and connected with the adjacent functional branch plate.

7. The air-cooled direct Brayton gas turbine hot end load frame of claim 6 wherein, The oil supply branch plate cold connection pipe installation openings on the oil supply branch plate front chamber and the oil supply branch plate rear chamber are distributed on both sides of the oil supply branch plate; The oil return branch plate cold connection pipe installation openings on the oil return branch plate front chamber and the oil return branch plate rear chamber are distributed on both sides of the oil return branch plate; The sealing branch plate cold connection pipe installation openings on the sealing branch plate front chamber and the sealing branch plate rear chamber are distributed on both sides of the sealing branch plate; The non-functional branch plate cold connection pipe installation openings on the non-functional branch plate front chamber and the non-functional branch plate rear chamber are distributed on both sides of the non-functional branch plate.

8. The air-cooled direct Brayton gas turbine hot end load frame of claim 6 or 7, wherein, The inner side of the non-functional branch plate is fixed on the inner force bearing casing through the circumferentially arranged pin shaft, and a joint bearing is installed between the pin shaft and the non-functional branch plate.

9. The air-cooled direct Brayton gas turbine hot end load frame of claim 8, wherein, The outer side of the straight branch plate is fixedly connected with the outer force bearing casing through one bushing for axial positioning and two radial tension bolts.

10. The air-cooled direct Brayton gas turbine hot end load frame of claim 9, wherein, The inner force bearing casing and the bearing seat are fixed in a way of stop port centering and bolt connection.

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