Auxiliary device for mounting exhaust pipe of helicopter engine

Abstract

The utility model belongs to the field of helicopter process equipment design, and particularly relates to an auxiliary device for installing an exhaust pipe of a helicopter engine. The auxiliary device comprises a positioning flange and a positioning pin; the positioning flange comprises a cylindrical structure, bosses and a flange structure, the flange structure is arranged on the upper end face of the cylindrical structure, the bosses are evenly distributed on the outer cylindrical face, and a circle of positioning bosses are arranged on the upper end face of the cylindrical structure. The working face of the positioning flange comprises an inner side cylindrical face of a cylindrical structure, n boss faces on the periphery, a flange end face and an outer cylindrical face of a positioning boss. Bushing mounting holes are uniformly formed in the flange structure; the positioning flange is fixed on the firewall by the positioning pin and the pair of bushing mounting holes; n is a positive integer.

Description

Technical Field

[0001] The utility model belongs to the field of helicopter process equipment design, and particularly relates to an auxiliary device for installing a helicopter engine exhaust pipe. Background Art

[0002] The engine exhaust pipe of a helicopter is located behind the main nozzle of the engine. The exhaust pipe has a complex curved surface structure. The outer shape of the part close to the main nozzle is approximately a cylindrical surface, which is sleeved on the tail of the main nozzle to connect and extend the exhaust of the main nozzle. There is a firewall between the engine exhaust pipe and the main nozzle. The exhaust pipe is installed and fixed on the firewall, and the gap between the connection part of the main nozzle and the exhaust pipe is required to be as equidistant as possible. Considering the installation process of the engine exhaust pipe and being limited by the operating space of the helicopter transmission platform, it is difficult to implement a set of special on-board installation tooling on the outside of the exhaust pipe. The original installation method of the engine exhaust pipe was mostly on-site fitting installation. When fitting, wooden blocks were used to block the gap between the exhaust pipe and the main nozzle to control the uniformity of the gap between the two. This installation method is both time-consuming and laborious, and the installation accuracy is poor. Content of the Utility Model

[0003] Purpose of the utility model: To propose an auxiliary device for installing a helicopter engine exhaust pipe, which is used to replace the original fitting method, improve the working intensity of the installation operation of the engine exhaust pipe, and improve the installation accuracy of the engine exhaust pipe.

[0004] Technical Solution

[0005] Provide an auxiliary device for installing a helicopter engine exhaust pipe, including: a positioning flange and a positioning pin;

[0006] The positioning flange includes a cylindrical barrel structure, a boss and a flange structure. The flange structure is arranged on the upper end surface of the cylindrical barrel structure. The bosses are evenly distributed on the outer cylindrical surface. A circle of positioning bosses is arranged on the upper end surface of the cylindrical barrel structure; the working surface of the positioning flange includes the inner cylindrical surface of the cylindrical barrel structure, the outer n boss surfaces, the flange end surface, and the outer cylindrical surface of the positioning bosses; bushing mounting holes are evenly distributed on the flange structure; the positioning pin and a pair of bushing mounting holes fix the positioning flange on the firewall; n is a positive integer;

[0007] A certain distance is left between the inner cylindrical surface and the outer shape of the engine main nozzle for comparing the relative position of the engine main nozzle;

[0008] The outer n boss surfaces of the positioning flange are evenly distributed along the circumference, and the outer diameter of the outer circle where the n boss surfaces are located is the same as the inner diameter of the engine exhaust pipe for positioning the engine exhaust pipe;

[0009] The flange end surface is used to abut against the firewall between the engine exhaust pipe and the main nozzle;

[0010] The diameter of the outer cylindrical surface is the same as the through-hole diameter of the firewall, which is used for pre-positioning the flange on the firewall.

[0011] Furthermore, bushings are installed along the circumference on the flange end face. The positions of the bushings are set according to the connection holes between the engine exhaust pipe and the firewall, which are used for positioning and drilling.

[0012] Furthermore, the bushings on the flange end face can be used not only for drilling the firewall but also for drilling the engine exhaust pipe.

[0013] Furthermore, a T-shaped rib is provided on the lower end face of the positioning flange, and a direction arrow mark is provided on the T-shaped rib, which is used to observe the placement posture of the device during use.

[0014] Furthermore, the positioning pins are used to position the positional relationship between this device and the engine exhaust pipe and the firewall.

[0015] Furthermore, n = 4.

[0016] Beneficial effects:

[0017] The engine exhaust pipe installation auxiliary device of the present utility model has a simple structure and is convenient to operate. It is used not only for the installation and positioning of the engine exhaust pipe but also for drilling the engine exhaust pipe and the firewall, and can also be used alone as a dummy part of the engine exhaust pipe, facilitating the in-aircraft installation operation of the engine exhaust pipe. Description of the drawings

[0018] Figure 1 is a schematic structural diagram of the engine exhaust pipe installation auxiliary device of the present utility model, wherein: 1 - positioning flange, 2 - positioning pin.

[0019] Figure 2a is Figure 1 the structural schematic of the main structural part, the positioning flange in Figure 1 .

[0020] Figure 2b is Figure 1 the second structural schematic diagram of the main structural part, the positioning flange in

[0021] Figure 3a is an application example of the present utility model Figure 1 .

[0022] Figure 3b is the second application example diagram of the present utility model.

[0023] Figure 4 is the enlarged view of the partial structure of Fig. 3. Detailed implementation manners

[0024] According to the structure and installation requirements of the connection part between the engine exhaust pipe and the main nozzle, and considering the limitation of the installation operation space, the utility model designs an auxiliary device for installing the engine exhaust pipe to replace the original matching method, improve the working intensity of the exhaust pipe installation operation, and improve the installation accuracy of the exhaust pipe.

[0025] The utility model provides an auxiliary device for installing the exhaust pipe of a helicopter engine. As Figure 1 shown, the main structural components of the device include a positioning flange 1 and a positioning pin 2.

[0026] The structure of the positioning flange is as Figure 2a and 2b shown. Its working surface includes an inner cylindrical surface, 4 convex surfaces on the outer periphery, a flange end surface, and an outer cylindrical surface on one side of the end surface.

[0027] There is a certain distance between the inner cylindrical surface of the positioning flange and the outer shape of the engine main nozzle, which is used to compare the relative position of the engine main nozzle.

[0028] The 4 convex surfaces on the outer periphery of the positioning flange are evenly distributed along the circumference, and the outer diameter of the circle where the 4 convex surfaces are located is the same as the inner diameter of the engine exhaust pipe, which is used to position the engine exhaust pipe.

[0029] The flange end surface of the positioning flange is used to abut against the firewall between the engine exhaust pipe and the main nozzle. A bushing is installed along the circumference on the flange end surface, and the position of the bushing is set according to the connection holes between the engine exhaust pipe and the firewall, which is used for positioning and hole making.

[0030] The outer cylindrical surface on one side of the end surface of the positioning flange has the same diameter as the through hole diameter of the firewall, which is used for pre-positioning the positioning flange on the firewall.

[0031] The bushing on the flange end surface can be used for hole making on the firewall or for hole making on the engine exhaust pipe.

[0032] The non-working surface of the positioning flange adopts a weight reduction design to reduce the weight of the device, and a direction arrow mark is set on the non-working surface, which is used to observe the placement posture of the device during use.

[0033] The positioning pin is used to position the positional relationship between the device, the engine exhaust pipe, and the firewall.

[0034] An example of the use of the utility model is as Figure 3a and 3bAs shown in the figure, during use, the end face of the positioning flange is abutted against the firewall. The through holes in the firewall can be used to initially position the device, and according to the direction markings on the device, the device is placed in the correct position. At this time, the device can be used as a drill jig to make the installation holes on the firewall. If one or more installation holes are made in the firewall in advance, positioning pins can be used to position the positioning flange and the firewall. At the same time, the relative position between the engine main nozzle and the device can be judged by using the inner cylindrical surface of the positioning flange. For the engine exhaust pipe, it can be placed on the device and positioned by using the 4 convex surfaces on the outer circumference of the positioning flange. At this time, the position of the engine exhaust pipe can be adjusted along the circumference, and its position relationship with the helicopter fairing can be observed. In addition, the device can be used to make the installation holes on the engine exhaust pipe. After the comparison and hole making of the engine exhaust pipe are completed, the device is removed, and the engine exhaust pipe can be directly installed on the firewall. The positional relationship between the device and the engine exhaust pipe, main nozzle and firewall during use can be seen in Figure 4 as shown in the figure, where the position of the engine exhaust pipe actually abuts against the firewall, and the positional relationship in the figure is only for demonstrating the use operation of the device and the engine exhaust pipe.

Claims

1. An auxiliary device for installing a helicopter engine exhaust pipe, characterized in that: include: Locating flange and locating pin; The positioning flange includes a cylindrical structure, a boss and a flange structure. The flange structure is arranged on the upper end surface of the cylindrical structure, the bosses are evenly distributed on the outer cylindrical surface, and a circle of positioning bosses is arranged on the upper end surface of the cylindrical structure; the working surface of the positioning flange includes the inner cylindrical surface of the cylindrical structure, the boss surface at the outer circumference n, the flange end surface, and the outer cylindrical surface of the positioning boss; bushing mounting holes are evenly arranged on the flange structure; the positioning pin and a pair of bushing mounting holes fix the positioning flange on the firewall; n is a positive integer; A certain distance is left between the inner cylindrical surface and the shape of the engine main nozzle, which is used to compare the relative position of the engine main nozzle; The convex surfaces at n locations on the outer circumference of the positioning flange are evenly distributed along the circumference, and the outer diameter of the convex surfaces at n locations is consistent with the inner diameter of the engine exhaust pipe, and is used to position the engine exhaust pipe; The flange end face is used to abut against the firewall between the engine exhaust pipe and the main nozzle; The diameter of the outer cylindrical surface is the same as the diameter of the through hole of the firewall and is used to pre-position the flange on the firewall.

2. The auxiliary device according to claim 1, characterized in that A bushing is installed around the flange end surface. The bushing position is set according to the connection hole between the engine exhaust pipe and the firewall for positioning and hole making.

3. The auxiliary device according to claim 2, characterized in that The bushing on the flange end face can be used to make holes in the firewall and also can be used to make holes in the engine exhaust pipe.

4. The auxiliary device according to claim 2, characterized in that A T-shaped rib is provided on the lower end surface of the positioning flange, and a direction arrow mark is provided on the T-shaped rib for observing the placement posture of the device during use.

5. The auxiliary device according to claim 4, characterized in that The positioning pin is used to locate the position relationship between the device and the engine exhaust pipe and the firewall.

6. The auxiliary device according to claim 5, characterized in that n＝4。

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