A process tail nozzle auxiliary fixing support for a gas turbine gas generator test

Abstract

The utility model relates to the technical field of gas turbine auxiliary tooling, specifically discloses a kind of process tail nozzle auxiliary fixing support of gas turbine gas generator test, including with tail nozzle fixed connection's installation part, with the fixed connection of external foundation's base subassembly, and for connecting installation part and base subassembly's connecting part, the base subassembly includes upper base and lower base, and axial movement groove is arranged between upper base and lower base to realize that both can move along the axial direction of tail nozzle, round hole is opened in the upper base, axial lengthening hole is opened in the lower base and is aligned with round hole, and connecting bolt is arranged between axial lengthening hole and round hole;The auxiliary fixing support structure disclosed in the patent is stable, eliminates cantilever beam effect, and simultaneously through the unique axial movement base subassembly design, can effectively absorb the thermal expansion of tail nozzle, release axial thermal stress, prevent component damage caused by stress concentration, and is safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary tooling technology for gas turbine experiments, and specifically discloses an auxiliary fixing bracket for the process tail nozzle of a gas turbine gas generator test. Background Technology

[0002] The gas turbine generator is a core component of aero-engines and industrial gas turbines, and its performance and reliability need to be verified through extensive ground tests. During the test, the exhaust nozzle, as a key component connected to the end of the gas generator, bears the important responsibility of guiding and expelling high-temperature gas. Therefore, the stability and reliability of the exhaust nozzle installation directly affect the safety of the test and the accuracy of the data.

[0003] Currently, when installing the tailpipe on a gas generator test bench, the common assembly method involves directly lifting and fixing it to the rear end of the turbine using a crane. This installation method results in an unfavorable cantilever beam structure between the tailpipe's center of gravity and the rear support point of the gas generator. This structure makes it difficult to maintain ideal axial alignment between the rear support point of the gas generator and the rear section of the low-pressure turbine disc, not only causing difficulties in initial assembly but also introducing additional bending moments and unbalanced forces during operation, potentially jeopardizing the overall alignment and operational stability of the gas generator.

[0004] Furthermore, gas generators inevitably vibrate during operation, and the exhaust nozzle undergoes significant thermal expansion under the influence of high-temperature gas, resulting in axial contraction and expansion. Using a completely rigid mounting bracket would not only constrain the axial displacement of the exhaust nozzle caused by thermal expansion and contraction, leading to the accumulation of enormous thermal stress on the bracket and the exhaust nozzle, but could also cause fatigue in components due to the transmission of vibration loads, resulting in cracks or even breakage, posing a serious safety hazard. Therefore, existing exhaust nozzle installation and fixing methods cannot simultaneously meet the multiple requirements of assembly accuracy, operational stability, and deformation compensation, necessitating the design of a novel auxiliary mounting bracket to solve these technical challenges. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary fixing bracket for the process tail nozzle of a gas turbine gas generator test, so as to solve the problems mentioned in the background art.

[0006] This utility model is achieved through the following technical solution: An auxiliary fixing bracket for the process tail nozzle of a gas turbine gas generator test includes a mounting part fixedly connected to the tail nozzle, a base assembly fixedly connected to an external foundation, and a connecting part for connecting the mounting part and the base assembly. The base assembly includes an upper base and a lower base, and an axial movement groove is provided between the upper base and the lower base to enable them to move along the axial direction of the tail nozzle. The upper base has a circular hole, and the lower base has an axial elongation hole aligned with the circular hole. A connecting bolt is provided between the axial elongation hole and the circular hole.

[0007] As a further feature of the above solution, the upper base has four circular holes, which are located at the four corners of the upper base respectively, and the lower base has four axial elongation holes, which are aligned vertically with each circular hole.

[0008] As a further feature of the above solution, the mounting part is an arc-shaped structure that matches the mounting edge of the tail nozzle, and the mounting part is provided with a plurality of light holes that are aligned one by one with the connection holes on the mounting edge of the tail nozzle. The light holes and the connection holes on the mounting edge of the tail nozzle are fixedly connected by fasteners.

[0009] As a further feature of the above solution, the connecting part has a round rod-shaped structure and is fixedly connected to the mounting part, and the upper base is fixed with a guide hole block that is interference-fitted with the connecting part.

[0010] As a further feature of the above solution, the auxiliary fixing brackets are used in pairs and are symmetrically arranged on both sides of the tail nozzle.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The auxiliary fixing bracket structure disclosed in this patent is stable and eliminates the cantilever beam effect. By providing reliable rear auxiliary support for the tail nozzle, it effectively improves its stress structure, avoids the adverse effects of the cantilever beam structure, and enhances operational stability.

[0012] 2. The auxiliary fixing bracket disclosed in this patent can release stress and has high safety. Through its unique axially movable base assembly design, it can effectively absorb the thermal expansion of the tailpipe, release axial thermal stress, and prevent component damage caused by stress concentration, making it safe and reliable.

[0013] 3. The auxiliary fixing bracket disclosed in this patent has precise positioning and good adaptability. It ensures the circumferential positioning accuracy of the tail nozzle through the cooperation between the flange mounting edge of the tail nozzle and multiple light holes. At the same time, the entire bracket structure also allows for slight radial displacement, which can better adapt to centering changes and vibrations. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the tail nozzle during fixed installation in this utility model. Figure 2 This is a three-dimensional structural diagram of the auxiliary fixing bracket at the first angle in this utility model; Figure 3 This is a three-dimensional structural diagram of the auxiliary fixing bracket in this utility model from a second angle. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-3 This application will be described in detail with reference to the embodiments. Example 1

[0018] Example 1 discloses an auxiliary fixing bracket for the process tail nozzle of a gas turbine gas generator test. The following description describes the fixing and support method of the entire process tail nozzle.

[0019] Reference Appendix Figure 1 A V-shaped main frame 300 is fixedly installed directly below the tail nozzle 200. The two ends of the main frame 300 are symmetrically located on both sides of the tail nozzle 200. Then, auxiliary fixing brackets 100 for assisting in fixing the tail nozzle 200 are fixedly installed on the upper ends of both sides of the main frame 300.

[0020] Reference Appendix Figure 2 and attached Figure 3 The auxiliary fixing bracket 100 in this embodiment 1 includes a mounting part 10 fixedly connected to the flange mounting edge on the tail nozzle 200, a base assembly 20 fixedly connected to the main frame 300, and a connecting part 30 for connecting the mounting part 10 and the base assembly 20.

[0021] In the specific design, the mounting part 10 is formed into an arc shape and matches the flange mounting edge on the tail nozzle 200. Multiple light holes 101 are evenly distributed on the mounting part 10, ensuring that each light hole 101 aligns with a connecting hole on the flange mounting edge. Bolts or other fasteners are then passed through the light holes 101 and the connecting holes on the flange mounting edge to secure the installation. Specifically, the number of light holes 101 is no less than two; in this embodiment 1, six light holes 101 are provided, and all six light holes 101 are fixedly connected to their corresponding connecting holes using fasteners.

[0022] The base assembly 20 includes an upper base 21 and a lower base 22. An axial moving groove 23 is provided between the upper base 21 and the lower base 22, which can move along the axial direction of the tail nozzle 200 (i.e., the two are in clearance fit), so that the upper base 21 and the lower base 22 can be inserted and axially slidably. A circular hole 211 is provided at each of the four corners of the upper base 21, and an axial elongation hole 221 (which can be regarded as a waist-shaped hole) corresponding to the circular hole 211 is provided at each of the four corners of the lower base 22. Then, a connecting bolt (not shown in the figure) is provided between each circular hole 211 and the corresponding axial elongation hole 221. Through the connection between the connecting bolt, the circular hole 211 and the axial elongation hole 221, the upper base 21 and the lower base 22 can be fixed vertically and horizontally, while the two can slide relative to each other in the front and back (i.e., the axial direction of the tail nozzle).

[0023] The connecting part 30 is generally cylindrical and is fixedly connected to the mounting part 10 or welded together. A guide hole block 24 is welded to the upper surface of the upper base 21, and a sliding hole matching the connecting part 30 is formed on the guide hole block 24. When the connecting part 30 mates with the sliding hole on the guide hole block 24, an interference fit is preferred, so that the mounting part 10 and the base assembly 20 can be fixedly connected together through the connecting part 30, and can produce slight radial movement under strong external vibration.

[0024] The auxiliary fixing bracket disclosed in Embodiment 1 provides support for the tail nozzle 200 during installation, effectively eliminating the cantilever beam structure caused by the tail nozzle 200's own weight and vibration. Simultaneously, due to the special design of the base assembly 20, which allows axial sliding, the tail nozzle 200 can freely expand and contract axially during thermal expansion, thus cleverly releasing enormous thermal stress and avoiding problems such as stress concentration, component deformation, or cracking caused by restricted thermal expansion.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary fixing bracket for the process tail nozzle in a gas turbine gas generator test, characterized in that, It includes a mounting part that is fixedly connected to the tail nozzle, a base assembly that is fixedly connected to an external foundation, and a connecting part for connecting the mounting part and the base assembly; The base assembly includes an upper base and a lower base, and an axial movement groove is provided between the upper base and the lower base to enable them to move along the axial direction of the tail nozzle. The upper base has a circular hole, and the lower base has an axial elongation hole aligned with the circular hole. A connecting bolt is provided between the axial elongation hole and the circular hole.

2. The auxiliary fixing bracket for the process tail nozzle of the gas turbine gas generator test according to claim 1, characterized in that, The upper base has four circular holes, which are located at the four corners of the upper base. The lower base has four axial elongation holes, which are aligned vertically with each of the circular holes.

3. The auxiliary fixing bracket for the process tail nozzle of the gas turbine gas generator test according to claim 1, characterized in that, The mounting part is an arc-shaped structure that matches the mounting edge of the tail nozzle, and the mounting part has a plurality of light holes that are aligned one by one with the connection holes on the mounting edge of the tail nozzle. The light holes and the connection holes on the mounting edge of the tail nozzle are fixedly connected by fasteners.

4. The auxiliary fixing bracket for the process tail nozzle of the gas turbine gas generator test according to claim 1, characterized in that, The connecting part has a round rod-shaped structure and is fixedly connected to the mounting part. The upper base is fixed with a guide hole block that is interference-fitted with the connecting part.

5. The auxiliary fixing bracket for the process tail nozzle of the gas turbine gas generator test according to claim 1, characterized in that, The auxiliary fixing brackets are used in pairs and are symmetrically arranged on both sides of the tail nozzle.

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