An adjustable internal support structure

Abstract

The application provides an inner support structure with adjustable air supply, and belongs to the technical field of aero-engines. The inner support structure comprises a body, first and second air inlet holes arranged on the upper and lower sides of the body respectively, a first air inlet hole communicating with a first air collection cavity, a second air inlet hole communicating with a second air collection cavity, and an air inlet pipe installed at the second air inlet hole; a first pre-rotation structure and a second pre-rotation structure, the first pre-rotation structure and the second pre-rotation structure are fixedly connected with the body after being superimposed, a first air supply channel communicating with the first air collection cavity is formed between the first pre-rotation structure and the body, and a second air supply channel communicating with the second air collection cavity is formed between the second pre-rotation structure and the first pre-rotation structure; the first air supply channel is used for supplying air to a rotor blade by two gas flows in a combustion chamber, and the second air supply channel is used for supplying controllable flow cold air to the rotor blade. The application can realize the design requirement of variable air induction quantity of the rotor blade and improve the performance of the engine.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to an adjustable air supply internal support structure. Background Technology

[0002] Both the turbine and stator blades of an aero-engine are exposed to high-temperature combustion gases. To ensure their safe operation, cooling is necessary. For high-pressure turbine guide vanes (or simply high-guide vanes) and high-pressure turbine rotor blades, cooling is achieved using two airflows from the combustion chamber. This involves using the inner wall of the combustion chamber flame tube and the internal support structure supporting the high-guide vanes to form a channel for supplying air to them. Simultaneously, the upper structure of the internal support forms an air collection chamber and a pre-swirl air supply structure to supply air to the high-pressure turbine rotor blades. The pre-swirl air supply structure typically employs a single-layer pre-swirl structure. However, with the increasing performance requirements of aero-engines and the significant differences between operating states, the cooling gas requirements of the high-pressure turbine rotor blades vary under different operating conditions. To achieve optimal engine performance, it is necessary to meet the different bleed air volume requirements of the high-pressure turbine rotor blades under different states. Therefore, the traditional single-layer pre-swirl air supply structure cannot meet the cooling gas requirements of the high-pressure turbine rotor blades. Summary of the Invention

[0003] The purpose of this application is to provide an adjustable gas supply internal support structure to solve or mitigate at least one of the problems in the prior art.

[0004] The technical solution of this application is: an adjustable gas supply internal support structure, the adjustable gas supply internal support structure comprising:

[0005] The main body has a first air inlet and a second air inlet on its upper and lower sides, respectively. The first air inlet is connected to a first air collection chamber, and the second air inlet is connected to a second air collection chamber. An air inlet pipe is installed at the second air inlet.

[0006] The first pre-spinning structure and the second pre-spinning structure are superimposed and fixedly connected to the main body. The first pre-spinning structure and the main body form a first air supply channel connecting the first air collection chamber, and the second pre-spinning structure and the first pre-spinning structure form a second air supply channel connecting the second air collection chamber.

[0007] Two streams of airflow in the combustion chamber supply air to the rotor blades through the first air supply channel, while controllable flow cold air supplies air to the rotor blades through the second air supply channel.

[0008] In at least one embodiment of this application, the front end of the body has a radially extending front mounting edge, and the front mounting edge 202 is provided with a front mounting hole. The rear side of the body has a radially extending rear mounting edge, and the rear mounting edge is provided with a rear mounting hole for fixed connection between the adjustable air supply inner support structure and the stator structure. The middle part of the body has a radially extending middle mounting edge for connection with the second pre-rotation structure and the first pre-rotation structure.

[0009] In at least one embodiment of this application, a flow guiding structure is provided on the front side of the first air inlet on the main body. The flow guiding structure at least partially covers the first air inlet, thereby forming a cavity at the front end of the flow guiding structure and the first air inlet for collecting dust particles.

[0010] In at least one embodiment of this application, ventilation grooves are provided on the middle mounting edge of the main body and the mounting edge of the first pre-rotation structure for introducing cold air from the second gas collection chamber into the second gas supply channel.

[0011] In at least one embodiment of this application, the ventilation slots are distributed in multiple circumferentially spaced intervals.

[0012] In at least one embodiment of this application, the shape of the ventilation slot includes a racetrack shape.

[0013] In at least one embodiment of this application, the extension arm of the main body is provided with a first vent hole, and the first pre-rotation structure and the second pre-rotation structure are respectively provided with a first boss and a second boss. The first boss and the second boss are provided with a second vent hole and a third vent hole. During assembly, the first vent hole, the second vent hole and the third vent hole correspond one-to-one, thereby forming a radially penetrating ventilation channel.

[0014] The adjustable air supply internal support structure of this application sets up two air collection chambers and a double-layer pre-swirl structure. One of the air supply is introduced through the air duct, and the flow rate can be controlled by a valve to achieve the design requirement of variable air volume for rotor blades and improve engine performance. At the same time, the design of the flow guide structure and the concave cavity structure reduces the impact of air duct on the combustion chamber and the impact of dust particles on the cooling of rotor blades. Attached Figure Description

[0015] 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.

[0016] like Figure 1 This is a schematic diagram of the installation of the internal support structure in the existing technology.

[0017] like Figure 2 This is a schematic diagram of the installation of the internal support structure of this application.

[0018] like Figure 3 This is an enlarged view of the internal support structure of this application.

[0019] Figure label:

[0020] 100-Inner support structure installation structure

[0021] 110 - Inner wall of combustion chamber, 111 - Flow channel

[0022] 120 - Internal support structure, 121 - Air inlet, 122 - Air collection chamber

[0023] 130-Sealed Plate

[0024] 140-Guide Blade

[0025] 150-rotor blades

[0026] 160-Turbine Disk

[0027] 200 - Adjustable air supply internal support structure

[0028] 201-Ontology

[0029] 202-Front Mounting Edge

[0030] 203-Front mounting hole

[0031] 204-rear installation edge

[0032] 205-Rear mounting hole

[0033] 206-First air intake

[0034] 207-Cavity

[0035] 208-First Air Collection Chamber

[0036] 209-First Pre-spin Structure

[0037] 210-First Gas Supply Channel

[0038] 211-Second Pre-spin Structure

[0039] 212-Second Gas Supply Channel

[0040] 213-Second air chamber

[0041] 214-Intake pipe

[0042] 215-bolt

[0043] 216-First vent

[0044] 217-Ventilation Slot

[0045] 218-Flow guiding structure

[0046] 219 - Second air intake

[0047] 220-Middle Installation Edge

[0048] 221-First Protrusion

[0049] 222-Second Protrusion

[0050] 223 - Second vent

[0051] 224 - Third vent Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0053] like Figure 1 The diagram shows the installation of an internal support structure in the prior art. In the installation structure 100 of the internal support structure, a flow channel 111 is formed between the internal support structure 120 and the inner wall 110 of the combustion chamber. The upper end of the internal support structure 120 is connected to the guide vane 140. The internal support structure 120 is a single-layer pre-swirl structure. Two streams of air in the combustion chamber are introduced into the air collection chamber 122 of the internal support structure 120 through the air inlet 121 provided on the internal support structure 121 along the flow channel 111. Finally, the air flows out from the rotor air supply channel 123 of the single-layer pre-swirl structure. The air duct 131 on the sealing plate 130 flows along the channel between the sealing plate 130 and the turbine plate 160 to supply air to the rotor blades 150. This structure can only achieve a constant flow of air supply to the rotor blades at 150°. When the engine is operating at low speed, it cannot reduce the air supply to the blades, which affects the engine performance. Furthermore, because there is no flow guiding structure at the air intake, it will also affect the cooling of the combustion chamber, which in turn affects the combustion quality. Dust particles in the airflow will also have an adverse effect on the cooling of the rotor blades.

[0054] In order to ensure smooth airflow to the rotor blades and controllable flow rate, this application provides an adjustable air supply internal support structure.

[0055] like Figure 2 and Figure 3 As shown, the adjustable gas supply internal support structure 200 provided in this application has a body 201, which is used to form a flow channel on the inner wall of the combustion chamber. The front end of the body 201 has a radially extending front mounting edge 202, on which a front mounting hole 203 is provided. The rear side of the body 201 has a radially extending rear mounting edge 204, on which a rear mounting hole 205 is provided. The adjustable gas supply internal support structure 200 is fixedly connected to the stator structure through the front and rear mounting edges. The inner side of the middle position of the body 201 has a radially extending middle mounting edge 220, on which a mounting hole is also provided.

[0056] The upper and lower sides of the internal support structure are respectively provided with a first air inlet 206 and a second air inlet 219. The first air inlet 206 is connected to the first air collection chamber 208, and the second air inlet 219 is connected to the second air collection chamber 213. An air inlet pipe 214 is installed at the second air inlet 219.

[0057] The internal support structure also includes a first pre-swirl structure 209 and a second pre-swirl structure 211. The first pre-swirl structure 209 and the second pre-swirl structure 211 are stacked and connected to the main body 201. A first air supply channel 210 is formed between the main body 201 and the first pre-swirl structure 209, and a second air supply channel 212 is formed between the first pre-swirl structure 209 and the second pre-swirl structure 211. The first pre-swirl structure 209 introduces two streams of air from the combustion chamber through the first air inlet 206 and into the first air collection chamber 208. The two streams of air from the combustion chamber supply air to the rotor blades through the first air supply channel 210 formed by the extension arm of the first pre-swirl structure 209 and the main body 201. The second pre-swirl structure 211 introduces controllable flow cold air into the second air collection chamber 213 through the air inlet of the air inlet pipe 214. The controllable flow cold air supplies air to the rotor blades through the second air supply channel 212 formed by the lower surfaces of the second pre-swirl structure 211 and the first pre-swirl structure 209.

[0058] In a preferred embodiment of this application, in order to ensure reliable air supply to the rotor blades, a flow guide structure 218 is provided on the front side of the first air inlet 206 on the inner support structure. The flow guide structure 218 at least partially covers the first air inlet 206, thereby forming a cavity 207 at the front end of the flow guide structure 218 and the first air inlet 206. Dust particles can be collected through the cavity 207 to prevent dust particles from adversely affecting the cooling of the rotor blades.

[0059] In this application, the body 201 of the inner support structure 200 is connected to the first pre-rotation structure 209 and the second pre-rotation structure 211 by bolts 215, which facilitates processing, manufacturing, and assembly. During assembly, the first pre-rotation structure 209 is first installed into the middle mounting edge 220 of the body 201, and then the second pre-rotation structure 211 is installed onto the first pre-rotation structure, connected by bolts. Ventilation grooves 217 are provided on the middle mounting edge 220 of the inner support structure and the mounting edge of the first pre-rotation structure 209. There are multiple ventilation grooves 217 distributed circumferentially, which are used to introduce cold air from the second air collection chamber 213 into the second air supply channel 212. In some embodiments of this application, the shape of the ventilation groove 217 can be a racetrack-shaped structure.

[0060] In this application, to ensure that other cavities (such as bearing cavities, sealing cavities, etc.) meet the air venting requirements of the pre-rotation structure, a first vent 216 is provided on the extension arm of the body 201 of the inner support structure, and a first boss 221 and a second boss 222 are provided on the first pre-rotation structure 209 and the second pre-rotation structure 211, respectively. A second vent 223 and a third vent 224 are provided on the first boss 221 and the second boss 222. During assembly, the three holes are ensured to correspond one-to-one in the angular and axial directions, thereby forming a radially penetrating ventilation channel.

[0061] In this application, the air intake pipe 214 can be fixed to the second air inlet 219 at the second air collection chamber 213 by welding or by mounting bracket. If welding is used, the upper end of the air intake pipe 214 is inserted into the second mounting hole 219 on the inner wall of the second air collection chamber 213 and welded in place. If mounting bracket is used, a flange is welded to the upper end of the air intake pipe 214 and fixed to the mounting boss at the second mounting hole 219 by screws. The inlet end of the air intake pipe 214 can typically be threaded to facilitate connection between the air intake pipe 214 and the air intake section.

[0062] The adjustable air supply internal support structure of this application sets up two air collection chambers and a double-layer pre-swirl structure. One of the air supply is introduced through the air duct, and the flow rate can be controlled by a valve to achieve the design requirement of variable air volume for rotor blades and improve engine performance. At the same time, the design of the flow guide structure and the concave cavity structure reduces the impact of air duct on the combustion chamber and the impact of dust particles on the cooling of rotor blades.

[0063] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adjustable air supply internal support structure, characterized in that, The adjustable air supply internal support structure (200) includes: The main body (201) has a first air inlet (206) and a second air inlet (219) on its upper and lower sides respectively. The first air inlet (206) is connected to the first air collection chamber (208), and the second air inlet (219) is connected to the second air collection chamber (213). An air inlet pipe (214) is installed at the second air inlet (219). The front end of the main body (201) has a radially extending front mounting edge (202) with a front mounting hole (203) on it. The rear side of the main body (201) has a radially extending rear mounting edge (204) with a rear mounting hole (205) on it, which is used to fix the adjustable air supply inner support structure (200) to the stator structure. The middle part of the main body (201) has a radially extending middle mounting edge (220) for connecting with the second pre-rotation structure (211) and the first pre-rotation structure (209). The first pre-spinning structure (209) and the second pre-spinning structure (211) are stacked and fixedly connected to the body (201). A first air supply channel (210) is formed between the first pre-spinning structure (209) and the body (201) to connect the first air collection chamber (208). A second air supply channel (212) is formed between the second pre-spinning structure (211) and the first pre-spinning structure (209) to connect the second air collection chamber (213). Two streams of airflow in the combustion chamber supply air to the rotor blades through the first air supply channel (210), and controllable flow cold air supplies air to the rotor blades through the second air supply channel (212).

2. The adjustable air supply internal support structure as described in claim 1, characterized in that, A flow guide structure (218) is provided on the front side of the first air inlet (206) on the main body (201). The flow guide structure (218) at least partially covers the first air inlet (206), thereby forming a cavity (207) at the front end of the flow guide structure (218) and the first air inlet (206) for collecting dust particles.

3. The adjustable air supply internal support structure as described in claim 1, characterized in that, Ventilation grooves (217) are provided on the mounting edge (220) of the main body and the mounting edge of the first pre-rotation structure (209) for introducing cold air from the second gas collection chamber (213) into the second gas supply channel (212).

4. The adjustable air supply internal support structure as described in claim 3, characterized in that, The ventilation slots (217) are distributed in multiple circumferential intervals.

5. The adjustable air supply internal support structure as described in claim 3 or 4, characterized in that, The ventilation slot (217) has a runway-shaped shape.

6. The adjustable air supply internal support structure as described in claim 1, characterized in that, The extension arm of the main body (201) is provided with a first vent hole (216). The first pre-rotation structure (209) and the second pre-rotation structure (211) are respectively provided with a first boss (221) and a second boss (222). The first boss (221) and the second boss (222) are provided with a second vent hole (223) and a third vent hole (224). During assembly, the first vent hole (216), the second vent hole (223) and the third vent hole (224) correspond one-to-one, thereby forming a radially penetrating ventilation channel.

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