Centering flexible swinging spray pipe and preparation method thereof

Abstract

The invention relates to the technical field of flexible swing spray pipes, in particular to a centering flexible swing spray pipe and a preparation method thereof, and the spray pipe comprises a diffusion section, a diffusion section shell, a throat liner assembly, a flexible assembly and a joint heat-proof ring. The diffusion section shell is arranged on the outer surface of the diffusion section in a sleeving manner; a first arc surface is arranged on the diffusion section shell; one end of the throat liner assembly is located in the diffusion section shell and connected with the connecting end of the diffusion section. A fixed shell of the flexible assembly is provided with a second arc surface matched with the first arc surface; and the circle centers of the first arc surface and the second arc surface coincide with the swing center of the flexible joint, so that the flexible swing spray pipe swings within a preset angle. The flexible joint has the advantages that the design that the two arc surfaces between the fixed shell and the diffusion section shell are matched is adopted, and the circle centers of the two arc surfaces coincide with the swing center of the flexible joint. In the swing process of the spray pipe, it can be ensured that the swing center position does not deviate, and therefore the control precision of swing of the spray pipe is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible swing nozzles, and specifically provides a centering flexible swing nozzle and a preparation method thereof. Background Art

[0002] The swing nozzle can achieve vector control of the engine thrust and mainly consists of a fixed housing, a movable body, and a movable joint. Compared with the rudder wing attitude adjustment, the swing nozzle has the advantages of high control efficiency and small thrust loss. According to the form of the movable joint of the nozzle, the current swing nozzles mainly include: flexible swing nozzles and ball socket joint swing nozzles. Through the comparative analysis of the swing torque, swing center drift, design reliability, and the size of the servo actuator system of swing nozzles with different structural forms, it is found that the flexible swing nozzle has a large swing center drift, while the ball socket swing nozzle has a large torque and a relatively large negative weight. At present, the market competitiveness of flexible swing nozzles and ball socket swing nozzles cannot meet the requirements of the aerospace market for low carbon, high efficiency, and high reliability. In addition, the swing center of the traditional flexible swing nozzle drifts, and the swing control accuracy is poor. Summary of the Invention

[0003] To solve the above problems, the present invention provides a centering flexible swing nozzle and a preparation method thereof. By respectively providing a first arc surface and a second arc surface that cooperate with each other on the diffuser section housing and the fixed housing, and making the centers of the two arc surfaces coincide with the swing center of the flexible joint, during the swing process of the swing nozzle, it can be ensured that the position of the swing center does not shift, thereby greatly improving the control accuracy of the nozzle.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows: A centering flexible swing nozzle includes: a diffuser section, the diffuser section having a conical structure; a diffuser section housing sleeved on the outer surface of the diffuser section; a first arc surface provided on the diffuser section housing; a throat liner assembly, one end of the throat liner assembly being located inside the diffuser section housing and connected to the connection end of the diffuser section; a flexible assembly including a flexible joint and a fixed housing; the fixed housing having a second arc surface adapted to the first arc surface; one end of the flexible joint being connected to the fixed housing, and the other end of the flexible joint being connected to the connection end of the diffuser section housing, so that the second arc surface fits with the first arc surface; the centers of the first arc surface and the second arc surface coincide with the swing center of the flexible joint, enabling the flexible swing nozzle to swing within a preset angle; a joint heat shield, the connection end of the joint heat shield being connected to the other end of the throat liner assembly and covering the outer surface of the flexible joint.

[0005] Further, the flexible assembly further includes a heat insulation layer sleeved on the outer surface of the fixed housing.

[0006] Further, the throat liner assembly includes a throat liner and a back liner, the back liner being sleeved on the outer surface of the throat liner.

[0007] Furthermore, the diffuser section housing includes a connecting flange which is connected to the flexible joint; the diffuser section housing is formed by high-strength steel, and the surface roughness of the first arc surface is at least Ra1.6.

[0008] Furthermore, the fixed housing is formed by machining high-strength titanium alloy, and the surface roughness of the second arc surface is at least Ra1.6.

[0009] A manufacturing method of a centering flexible swing nozzle for manufacturing the above-mentioned centering flexible swing nozzle, comprising the following steps: S1: Prepare the diffuser section, the diffuser section housing, the throat liner assembly, the flexible assembly and the joint heat shield.

[0010] S2: Glue the diffuser section housing to the outer surface of the diffuser section.

[0011] S3: Bond one end of the throat liner assembly to the connecting end of the diffuser section.

[0012] S4: Connect the flexible assembly to the diffuser section housing.

[0013] S5: Bond the connecting end of the joint heat shield to the other end of the throat liner assembly and cover the outer surface of the flexible joint.

[0014] Furthermore, the preparation of the diffuser section in step S1 includes the following steps: S111: First, on the mold of the diffuser section, use carbon cloth / barium phenolic cloth tape to wind and form to prepare the inner layer of the diffuser section.

[0015] S112: Then, use high-silica / barium phenolic cloth tape to wind and form on the inner layer of the diffuser section to prepare the outer layer of the diffuser section, forming an uncured diffuser section.

[0016] S113: Finally, cure and form the uncured diffuser section.

[0017] Furthermore, the preparation of the throat liner assembly in step S1 includes the following steps: S121: First, on the throat liner mold, use carbon / carbon composite material to wind and form to prepare the throat liner of the throat liner assembly.

[0018] S122: Then, use high-silica / barium phenolic cloth tape to wind and form on the formed throat liner to prepare the back lining of the throat liner assembly, so as to form an uncured throat liner assembly.

[0019] S113: Finally, cure and form the uncured throat liner assembly.

[0020] Furthermore, the preparation of the joint heat shield in step S1 includes the following steps: S131: First, on the mold of the joint heat shield ring, use high silica / barium phenolic cloth tape to wind and form to prepare the inner layer of the joint heat shield ring.

[0021] S112: Next, on the inner layer of the joint heat shield ring, use carbon cloth / barium phenolic cloth tape to wind and form to prepare the outer layer of the joint heat shield ring, forming an uncured joint heat shield ring.

[0022] S113: Finally, cure and form the uncured joint heat shield ring.

[0023] Furthermore, step S4 includes the following steps: S41: Prepare the prepared flexible joint, fixed housing, and insulation layer.

[0024] S42: Glue the insulation layer to the outer surface of the fixed housing.

[0025] S43: Connect one end of the flexible joint to the connection end of the fixed housing, and the other end to the connection end of the diffuser section housing.

[0026] Compared with the prior art, the present invention can achieve the following beneficial effects: The centering flexible swing nozzle of the present invention adopts a design in which two arc surfaces between the fixed housing and the diffuser section housing cooperate, and the centers of the two arc surfaces coincide with the swing center of the flexible joint. During the swing of the nozzle, through the assembly relationship between the fixed housing and the diffuser section housing, it can ensure that the position of the swing center does not shift, thereby greatly improving the control accuracy of the swing nozzle. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the centering flexible swing nozzle provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of the diffuser section housing provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of the flexible component provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of the joint heat shield ring provided by an embodiment of the present invention.

[0028] The reference numerals therein include: 1, diffuser section; 11, inner layer of diffuser section; 12, outer layer of diffuser section; 2, diffuser section housing; 21, conical body; 22, first arc surface; 23, connecting flange; 24, lug; 3, throat liner assembly; 31, throat liner; 32, back liner; 4, flexible component; 41, flexible joint; 42, fixed housing; 43, insulation layer; 44, second arc surface; 5, joint heat shield ring; 51, inner layer of heat shield ring; 52, outer layer of heat shield ring. Detailed Embodiments

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation to the present invention.

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] As Figures 1 to 4 shown, a centering flexible swing nozzle provided by an embodiment of the present invention includes: a diffuser section 1, a diffuser housing 2, a throat liner assembly 3, a flexible assembly 4, and a joint heat shield 5.

[0035] The diffuser section 1 has a conical tube structure, and its inner surface and outer surface are both smooth conical surfaces. In this embodiment, the diameter of the large end of the diffuser section 1 is 299 mm, the diameter of the small end is 282 mm, and the axial length is 274 mm.

[0036] The diffuser section 1 includes an inner diffuser layer 11 and an outer diffuser layer 12. The inner diffuser layer 11 is formed by winding 3k carbon cloth / barium phenolic cloth tape. The outer diffuser layer 12 is formed by winding high silica / barium phenolic cloth tape.

[0037] The diffuser housing 2 is sleeved on the outer surface of the diffuser section 1 and includes a conical body 21, a first arc surface 22, a connecting flange 23, and lugs 24. The connecting flange 23 is located at the small end of the conical body 21 and is used to connect to the flexible component 4. The connecting flange 23 has a mounting hole provided along the axis, and the throat liner assembly 3 is located within the mounting hole. The number of lugs 24 is four, which are evenly distributed on the outer peripheral surface of the conical body 21 and are close to the large end of the conical body 21. The first arc surface 22 is located between the connecting flange 23 and the lugs 24, and the center of the first arc surface 22 coincides with the swing center of the flexible component 4. The lugs 24 are used to connect the external components of the centering flexible swing nozzle In this embodiment, the diffuser housing 2 is formed by machining 30CrMnSiA high-strength steel. The arc radius of the first arc surface 22 is 91 mm, and its surface roughness is at least Ra1.6. The outer surface of the diffuser housing 2 (mainly the first arc surface 22) is chrome-plated. The inner surface of the diffuser housing 2 is adapted to the outer surface of the diffuser section 1, and the inner surface of the diffuser housing 2 is sandblasted. 30-60 mesh quartz sand is selected for sandblasting. The main purpose of sandblasting is to help the adhesive adhere better and enhance the bonding effect. The diameter of the mounting hole of the connecting flange 23 is 97.7 mm, and 36 M6 threaded holes are evenly distributed on the end face of the connecting flange 23 for connecting to the flexible component 4.

[0038] One end of the throat liner assembly 3 is located within the mounting hole of the connecting flange 23 and is connected to the connecting end of the diffuser section 1. The throat liner assembly 3 includes a throat liner 31 and a backing 32, and the backing 32 is sleeved on the outer surface of the throat liner 31.

[0039] In this embodiment, the throat liner 31 is formed by winding carbon / carbon composite material. The backing 32 is formed by winding high silica / barium phenolic cloth tape. Specifically, the inner diameter of the throat liner 31 is 39 mm, and the outer diameter is 73.72 mm. The outer diameter of the backing 32 is 97.72 mm, and the inner diameter is 73.72 mm. The dimensional deviation of the inner diameter of the throat liner 31 and the dimensional deviation of the outer diameter of the backing 32 are both ±0.02 mm.

[0040] The flexible component 4 includes a flexible joint 41, a fixed housing 42, and a heat insulation layer 43. One end of the flexible joint 41 is connected to the fixed housing 42, and the other end of the flexible joint 41 is connected to the connecting flange 23 of the diffuser section housing 2. The heat insulation layer 43 is sleeved on the outer surface of the fixed housing 42. The fixed housing 42 has a second arc surface 44 adapted to the first arc surface 22. When the flexible joint 41 is connected to the connecting flange 23, the second arc surface 44 fits with the first arc surface 22, and the centers of the first arc surface 22 and the second arc surface 44 coincide with the swing center of the flexible joint 41. Through the assembly relationship between the fixed housing 42 and the diffuser section housing 2, it can be ensured that the swing center position of the flexible joint 41 does not shift, thereby greatly improving the control accuracy of the swing nozzle and enabling the swing nozzle to swing stably within the swing angle range of ±8°.

[0041] During the assembly process of the flexible component 4, the flexible joint 41 and the connecting flange 23 are both sealed by a sealing ring, and at the same time, D03 putty is applied to enhance the sealing effect. In addition, the flexible joint 41 is in a pre-compressed state during assembly. In this embodiment, the compression amount of the flexible joint 41 is 3.8 mm.

[0042] The fixed housing 42 is machined from high-strength titanium alloy, and the surface roughness of the second arc surface 44 is at least Ra1.6. The second arc surface 44 is chrome-plated, and the outer surface of the fixed housing 42 is sandblasted, and quartz sand with a mesh size of 30 - 60 is selected for the sandblasting.

[0043] The connecting end of the joint heat protection ring 5 is connected to the end of the throat lining assembly 3 away from the diffuser section 1 and covers the outer surface of the flexible joint 41. The joint heat protection ring 5 includes a heat protection ring inner layer 51 and a heat protection ring outer layer 52. The heat protection ring inner layer 51 is formed by winding high-silica / barium phenolic cloth tape. The heat protection ring outer layer 52 is formed by winding carbon cloth / barium phenolic cloth tape.

[0044] A preparation method for a centering flexible swing nozzle, which is used to prepare the above-mentioned centering flexible swing nozzle, includes the following steps: S1: Prepare the diffuser section 1, the diffuser section housing 2, the throat lining assembly 3, the flexible component 4, and the joint heat protection ring 5.

[0045] The preparation of the diffuser section 1 includes the following steps: S111: First, on the diffuser section mold, use 3k carbon cloth / barium phenolic cloth tape to wind and form to prepare the diffuser section inner layer 11.

[0046] S112: Then, on the formed diffuser section inner layer 11, use high-silica / barium phenolic cloth tape to wind and form to prepare the diffuser section outer layer 12, forming an uncured diffuser section.

[0047] S113: Finally, cure and form the uncured diffuser section.

[0048] In this embodiment, the pressure for curing and forming is 1 MPa. First, when the temperature rises to 120 °C, it is maintained for 3 hours. Then, the temperature rises to 140 °C and is maintained for 2 hours. Finally, the temperature rises to 160 °C and is maintained for 2.5 hours to complete curing.

[0049] The diffusion section 1 and the throat liner assembly 3 described below, as well as the joint heat shield 5, are all wound and formed and cured using the same specification and model of winding machine and autoclave. Both the winding machine and the autoclave are purchased parts.

[0050] The preparation of the throat liner assembly 3 includes the following steps: S121: First, on the throat liner mold, the throat liner 31 is prepared by winding and forming with carbon / carbon composite materials.

[0051] S122: Next, on the formed throat liner 31, the back lining 32 is prepared by winding and forming with high silica / barium phenolic cloth tape to form an uncured throat liner assembly.

[0052] S113: Finally, the uncured throat liner assembly is cured and formed.

[0053] The pressure for curing and forming the throat liner assembly 3 is 1 MPa. First, when the temperature is 120 °C, it is maintained for 3 hours. Then, the temperature rises to 140 °C and is maintained for 2 hours. Finally, the temperature rises to 160 °C and is maintained for 2.5 hours to complete curing.

[0054] The preparation of the joint heat shield 5 includes the following steps: S131: First, on the joint heat shield mold, the inner layer 51 of the heat shield is prepared by winding and forming with high silica / barium phenolic cloth tape.

[0055] S112: Next, on the inner layer 51 of the joint heat shield, the outer layer 52 of the heat shield is prepared by winding and forming with carbon cloth / barium phenolic cloth tape to form an uncured joint heat shield.

[0056] S113: Finally, the uncured joint heat shield is cured and formed.

[0057] The pressure for curing and forming the joint heat shield 5 is 1 MPa. First, when the temperature is 120 °C, it is maintained for 3 hours. Then, the temperature rises to 140 °C and is maintained for 2 hours. Finally, the temperature rises to 160 °C and is maintained for 2.5 hours to complete curing.

[0058] S2: Glue the diffusion section housing 2 to the outer surface of the diffusion section 1, including the following steps: First, process the outer surface of the diffusion section 1 and conduct a trial assembly with the diffusion section housing 2 to ensure that the gap between the diffusion section housing 2 and the diffusion section 1 meets the accuracy requirements.

[0059] When the diffuser section 1 is prepared, its inner surface is formed by the outer surface of the diffuser section mold and has a relatively regular shape, so no further processing is required. However, the outer surface of the diffuser section 1 has an irregular shape after curing and needs to be processed to make its outer surface smooth. During the processing, the outer surface of the diffuser section 1 needs to be continuously test-fitted with the diffuser section housing 2 to ensure that the gap between the diffuser section housing 2 and the diffuser section 1 meets the accuracy requirements. The gap between the diffuser section housing 2 and the diffuser section 1 is 0.1 mm - 0.3 mm. In this embodiment, the gap between the diffuser section housing 2 and the diffuser section 1 is 0.2 mm.

[0060] Next, the bonding surface (inner surface) of the diffuser section housing 2 is sandblasted. Quartz sand with a mesh size of 30 - 60 is selected for the sandblasting treatment.

[0061] Finally, the diffuser section housing 2 is sleeved on the outer surface of the diffuser section 1 and bonded with a high-strength epoxy adhesive, and cured at room temperature for 48 hours.

[0062] S3: Bond one end of the throat liner assembly 3 to the connecting end of the diffuser section 1, including the following steps; First, the outer surface of the throat liner assembly 3 is processed and test-fitted with the mounting holes of the connecting flange 23 to ensure that the gap between the outer surface of the throat liner assembly 3 and the inner surface of the mounting holes meets the accuracy requirements. Subsequently, the throat liner assembly 3 is connected to the diffuser section 1 through a buffer layer. Specifically, one end of the throat liner assembly 3 is bonded to one end of the buffer layer with a high-strength epoxy adhesive, and the other end of the buffer layer is bonded to the connecting end of the diffuser section 1 with a high-strength epoxy adhesive. The buffer layer is filled and formed with high-temperature-resistant D03 putty, and the thickness of the buffer layer is 0.2 mm - 0.4 mm.

[0063] When the throat liner assembly 3 is prepared, its inner surface is formed by the outer surface of the throat liner mold and has a relatively regular shape, so no further processing is required. However, the outer surface of the throat liner assembly 3 has an irregular shape after curing and needs to be processed to make its outer surface smooth. During the processing, the outer surface of the throat liner assembly 3 needs to be continuously test-fitted with the diffuser section housing 2 to ensure that the gap between the diffuser section housing 2 and the throat liner assembly 3 meets the accuracy requirements. The gap between the diffuser section housing 2 and the throat liner assembly 3 is 0.1 mm - 0.3 mm. In this embodiment, the gap between the diffuser section housing 2 and the throat liner assembly 3 is 0.2 mm. The thickness of the buffer layer is 0.2 mm.

[0064] S4: Connect the flexible component 4 to the diffuser section housing 2, including the following steps: S41: Prepare the prepared flexible joint 41, fixed housing 42, and thermal insulation layer 43.

[0065] S42: Glue the thermal insulation layer 43 to the outer surface of the fixed housing 42.

[0066] Specifically, first, a trial assembly is carried out between the thermal insulation layer 43 and the fixed housing 42 to ensure that the gap between the thermal insulation layer 43 and the fixed housing 42 meets the precision requirements. The gap between the thermal insulation layer 43 and the fixed housing 42 is 0.1 mm - 0.3 mm. In this embodiment, the gap between the thermal insulation layer 43 and the fixed housing 42 is 0.2 mm.

[0067] Next, the bonding surface (outer surface) of the fixed housing 42 is subjected to sandblasting treatment.

[0068] Finally, the thermal insulation layer 43 is sleeved on the outer surface of the fixed housing 42, and bonded with a high-strength epoxy adhesive, and cured at room temperature for 48 hours.

[0069] S43: One end of the flexible joint 41 is connected to the connecting end of the fixed housing 42 through bolts, and the other end is connected to the connecting flange 23 through high-strength bolts.

[0070] Both between the flexible joint 41 and the connecting flange 23 are sealed through sealing rings, and at the same time, D03 putty is applied to enhance the sealing effect. In addition, the flexible joint 41 is in a pre-compressed state during assembly. In this embodiment, the compression amount of the flexible joint 41 is 3.8 mm.

[0071] S5: The connecting end of the joint heat shield 5 is adhesively bonded to the other end of the throat liner assembly 3 and covers the outer surface of the flexible joint 41.

[0072] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A centering flexible swing nozzle, characterized in that: include: A diffusion section, wherein the diffusion section has a conical structure; A diffuser section casing, wherein the diffuser section casing is sleeved on the outer surface of the diffuser section; The diffuser shell is provided with a first arc surface; A throat liner assembly, one end of which is located in the diffuser housing and connected to the connecting end of the diffuser; A flexible component, the flexible component comprising a flexible joint and a fixed shell; the fixed shell has a second arc surface adapted to the first arc surface; one end of the flexible joint is connected to the fixed shell, and the other end of the flexible joint is connected to the connecting end of the diffuser shell, so that the second arc surface fits the first arc surface; The centers of the first arc surface and the second arc surface coincide with the swing center of the flexible joint, so that the flexible swing nozzle swings within a preset angle; A joint heat protection ring, the connection end of which is connected to the other end of the throat liner assembly and covers the outer surface of the flexible joint.

2. The centering flexible oscillating nozzle according to claim 1, characterized in that: The flexible component further comprises a heat insulating layer, and the heat insulating layer is sleeved on the outer surface of the fixed shell.

3. The centering flexible oscillating nozzle according to claim 1, characterized in that: The throat liner assembly comprises a throat liner and a backing liner, wherein the backing liner is sleeved on the outer surface of the throat liner.

4. The centering flexible oscillating nozzle according to claim 1, characterized in that: The diffuser section shell includes a connecting flange, and the connecting flange is connected to the flexible joint; the diffuser section shell is formed by high-strength steel, and the surface roughness of the first arc surface is at least Ra1.

6.

5. The centering flexible oscillating nozzle according to claim 1, characterized in that: The fixed shell is formed by machining of high-strength titanium alloy, and the surface roughness of the second arc surface is at least Ra1.

6.

6. A method for preparing a centering flexible oscillating nozzle, used for preparing the centering flexible oscillating nozzle according to any one of claims 1 to 5, characterized in that: The steps include: S1: Prepare the diffuser, diffuser shell, throat liner assembly, flexible assembly and joint heat protection ring; S2: gluing the diffuser shell to the outer surface of the diffuser; S3: bonding one end of the throat liner assembly to the connecting end of the diffuser section; S4: connecting the flexible component to the diffuser shell; S5: Bond the connection end of the joint heat protection ring to the other end of the throat lining assembly and cover it on the outer surface of the flexible joint.

7. The method for preparing the centering flexible oscillating nozzle according to claim 6, characterized in that: The preparation of the diffusion section in step S1 includes the following steps: S111: First, on the mold of the diffusion section, carbon cloth / barium phenolic cloth tape is used for winding and molding to prepare the inner layer of the diffusion section; S112: Next, a high-silicon / barium phenolic cloth tape is used to perform winding molding on the inner layer of the diffusion section to prepare the outer layer of the diffusion section, thereby forming an uncured diffusion section; S113: Finally, the uncured diffusion section is cured and formed.

8. The method for preparing the centering flexible oscillating nozzle according to claim 6, characterized in that: The preparation of the throat liner assembly in step S1 includes the following steps: S121: First, on a throat liner mold, a throat liner of a throat liner assembly is prepared by winding a carbon / carbon composite material; S122: Next, a high-silicon / barium phenolic cloth tape is used to wrap and mold the formed throat liner to prepare a backing of the throat liner assembly to form an uncured throat liner assembly; S113: Finally, the uncured throat liner assembly is cured and formed.

9. The method for preparing the centering flexible oscillating nozzle according to claim 6, characterized in that: The preparation of the joint heat protection ring in step S1 includes the following steps: S131: First, on the mold of the joint heat protection ring, a high-silicon / barium phenolic cloth tape is used for winding and molding to prepare the inner layer of the joint heat protection ring; S112: Next, on the inner layer of the joint heat protection ring, a carbon cloth / barium phenolic cloth tape is used for winding and molding to prepare the outer layer of the joint heat protection ring, thereby forming an uncured joint heat protection ring; S113: Finally, the uncured joint heat protection ring is cured and formed.

10. The method for preparing the centering flexible oscillating nozzle according to claim 6, characterized in that: Step S4 includes the following steps: S41: Prepare the prepared flexible joint, fixed shell and insulation layer; S42: gluing the heat insulating layer to the outer surface of the fixed shell; S43: Connect one end of the flexible joint to the connection end of the fixed shell, and the other end to the connection end of the diffuser shell.

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