An anti-corrosion structure for a magnesium alloy casing

Abstract

The present invention belongs to the field of helicopter transmission systems, and particularly relates to an anti-corrosion structure for a magnesium alloy casing, which comprises a magnesium alloy casing body. The magnesium alloy casing body includes a main casing and an oil sump, the main casing is connected to the oil sump, the main casing is provided with connecting legs, and a diversion slope is arranged on the connecting part of the connecting legs. By arranging a diversion slope on the connecting part, the corrosive medium liquid can be discharged through the diversion slope, avoiding the long-term accumulation of the corrosive medium liquid on the connecting part, preventing the corrosion of the connecting part, and improving the service life of the magnesium alloy casing.

Description

Technical Field

[0001] The present invention belongs to the field of helicopter transmission systems, and particularly relates to an anti-corrosion structure for a magnesium alloy casing. Background Art

[0002] The environment in which a helicopter is located during flight is complex. When in a marine environment, due to the high atmospheric humidity in the marine environment and the fact that seawater evaporation forms an atmospheric environment containing a large amount of salt, various corrosive medium liquids containing Cl - , NO3 - , SO4 2- etc. are likely to deposit on the helicopter; and the transmission system casing of the helicopter is made of magnesium alloy, and generally a paint is coated on the surface of the transmission system casing to prevent it from being corroded; however, despite such anti-corrosion treatment, corrosion as shown in Figure 1 still exists at the connecting legs of the transmission system casing, resulting in damage to the transmission system casing and reducing the service life of the transmission system casing.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The connecting leg of the transmission system casing (magnesium alloy casing) is an important component for connecting the magnesium alloy casing with the helicopter body casing; since it needs to be connected to the helicopter body casing, it is provided with a horizontal connecting portion for connecting to the helicopter body casing. During use, this horizontal connecting portion is prone to water accumulation, so corrosive medium liquids are likely to accumulate here, leading to corrosion of the connecting leg.

[0005] In order to solve the technical problems existing in the prior art, the present invention provides an anti-corrosion structure for a magnesium alloy casing. By providing a diversion slope on the connecting portion, the corrosive medium liquid can be discharged through the diversion slope, avoiding the long-term accumulation of the corrosive medium liquid on the connecting portion, preventing corrosion of the connecting portion, and improving the service life of the magnesium alloy casing.

[0006] The present invention includes the following technical solutions:

[0007] The present invention provides an anti-corrosion structure for a magnesium alloy casing, including a magnesium alloy casing body. The magnesium alloy casing body includes a main casing and an oil sump. The main casing is connected to the oil sump. The main casing is provided with a connecting leg, and a diversion slope is provided on the connecting portion of the connecting leg.

[0008] Further, the diversion slope covers the entire upper surface of the connecting portion.

[0009] Further, sunken threaded connection holes are provided on the connecting portion.

[0010] Further, the diversion slope is a smooth transition surface.

[0011] Further, the main casing is provided with H-shaped stiffeners.

[0012] Further, the H-shaped stiffeners are provided with flow guiding holes.

[0013] Further, the H-shaped stiffeners include a first vertical portion, a second vertical portion and a horizontal portion, and the horizontal portion is connected between the first vertical portion and the second vertical portion;

[0014] The first vertical portion is provided with flow guiding holes, and the second vertical portion is provided with flow guiding holes;

[0015] The flow guiding holes are close to the horizontal portion and the main casing.

[0016] Further, the outer diameter of the flow guiding holes is tangent to the horizontal portion; and / or the outer diameter of the flow guiding holes is tangent to the main casing.

[0017] Further, an anti-rust sealant is provided on the joint surface of the main casing and the lubricating oil sump, and the main casing and the lubricating oil sump are connected by bolts; primer, sealant and heat-resistant paint are sequentially provided on the exposed part of the bolts.

[0018] Further, the surface of the magnesium alloy casing body is provided with heat-resistant paint.

[0019] Adopting the technical solution of the present invention, the present invention has the following advantages:

[0020] In the present invention, a flow guiding slope is provided on the connecting portion so that the corrosive medium liquid can be discharged through the flow guiding slope, avoiding the long-term accumulation of the corrosive medium liquid on the connecting portion, preventing the corrosion of the connecting portion, and improving the service life of the magnesium alloy casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a corrosion diagram of the magnesium alloy casing in the background art of the present invention;

[0023] Figure 2 is a schematic structural diagram of an anti-corrosion structure of a magnesium alloy casing in an embodiment of the present invention Figure 1 ;

[0024] Figure 3 is a partial structural schematic diagram of the connecting leg in an embodiment of the present invention;

[0025] Figure 4 This is a schematic structural view of the connecting part in the embodiment of the present invention;

[0026] Figure 5 This is a schematic view in which the outer diameter of the diversion hole in the embodiment of the present invention is tangent to the horizontal part and the outer diameter of the diversion hole is tangent to the main casing;

[0027] Figure 6 This is a schematic structure of an anti-corrosion structure of a magnesium alloy casing in the embodiment of the present invention Figure 2 ;

[0028] In the drawings: 10 - main casing, 20 - lubricating oil sump, 30 - connecting leg, 31 - connecting part, 310 - diversion slope, 311 - end, 320 - sunken threaded connection hole, 40 - H-shaped reinforcing rib, 41 - first vertical part, 42 - second vertical part, 43 - horizontal part, 50 - diversion hole. Detailed implementation manners

[0029] The following description provides many different embodiments or examples for implementing different features of the present invention. The elements and arrangements described in the following specific examples are only used to concisely express the present invention, and they are only examples and not intended to limit the present invention.

[0030] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] As Figure 2 shown, this embodiment provides an anti-corrosion structure for a magnesium alloy casing, including a magnesium alloy casing body. The magnesium alloy casing body includes a main casing 10 and a lubricating oil sump 20. The main casing 10 and the lubricating oil sump 20 are connected. The main casing 10 is provided with a connecting leg 30, and a diversion slope 310 is provided on the connecting part 31 of the connecting leg 30. In Figure 2 it is difficult to show the diversion slope 310 because it is relatively small compared to the overall figure; it can be seen from Figure 3The diversion slope surface 310 provided on the connecting portion 31 can be seen.

[0033] Furthermore, the diversion slope surface 310 covers the upper surface of the entire connecting portion 31; it should be understood that: as Figure 4 shown, the upper surface of the connecting portion 31 as a whole has a slope. Based on this, it is more conducive to the discharge of corrosive medium liquid and avoids the corrosion of the connecting portion 31.

[0034] Furthermore, a sunken threaded connection hole 320 is provided on the connecting portion 31. The magnesium alloy casing body is connected to the helicopter body casing through the sunken threaded connection hole 320. The sunken threaded connection hole 320 not only does not affect the function of the diversion slope surface 310, but also ensures the effective connection between the magnesium alloy casing body and the helicopter body casing.

[0035] Preferably, after the connecting portion 31 and the helicopter body casing are bolted together, a primer, a sealant, and a heat-resistant paint are sequentially provided on the exposed part of the bolt; at the same time, the sealant needs to ensure that the gap between the nut and the side surface of the sunken threaded connection hole 320 is sealed. Based on this, it has an anti-corrosion effect.

[0036] Furthermore, as Figure 4 shown, the diversion slope surface 310 is a smooth transition surface. Based on this, it is more conducive to the discharge of corrosive medium liquid and avoids the corrosion of the connecting portion 31.

[0037] Preferably, there is a sharp corner at the end 311 of the diversion slope surface 310. This sharp corner can make the corrosive medium liquid discharged through the diversion slope surface 310 fall in a parabola, avoiding the corrosive medium liquid flowing down along the side surface of the connecting portion 31. The corrosive liquid flowing down along the side surface of the connecting portion 31 is more likely to accumulate at the connection position between the connecting portion 31 and the helicopter body casing, which is likely to cause corrosion.

[0038] It should be noted that, of course, other forms of the diversion slope surface 310 should also be within the protection scope of the present invention. For example, the diversion slope surface 310 is composed of a plurality of inclined surfaces connected in sequence, and the included angle between any two adjacent inclined surfaces is preferably an obtuse angle to avoid damaging the structure of the connecting portion 31.

[0039] Of course, the diversion slope surface 310 may not be a smooth transition surface, and it may also be a diversion slope surface 310 as shown in Figure 6 the figure.

[0040] Furthermore, an H-shaped reinforcing rib 40 is provided on the main casing 10. The H-shaped reinforcing rib 40 usually needs to be connected to a hook, and the hook needs to be connected to the booster of the helicopter; specifically: the horizontal part 43 of the H-shaped reinforcing rib is connected to the hook, and the hook is connected to the booster. Generally, a connection hole is provided on the H-shaped reinforcing rib, and the booster hook is hung on this connection hole. In order to make the connection more stable, the connection hole is preferably horizontal. Therefore, by using the H-shaped reinforcing rib 40, the horizontalness of the connection hole can be ensured, that is, the connection hole is arranged on the horizontal part 43 of the reinforcing rib 40.

[0041] Furthermore, a diversion hole 50 is provided on the H-shaped reinforcing rib 40. Through the diversion hole 50, the corrosive medium liquid on the reinforcing rib is discharged, preventing the corrosive medium liquid from accumulating on the H-shaped reinforcing rib 40, avoiding the corrosion of the reinforcing rib and the main casing 10, and improving the service life of the magnesium alloy casing.

[0042] Furthermore, the H-shaped reinforcing rib 40 includes a first vertical part 41, a second vertical part 42 and a horizontal part 43. The horizontal part 43 is connected between the first vertical part 41 and the second vertical part 42; a diversion hole 50 is provided on the first vertical part 41, and a diversion hole 50 is provided on the second vertical part 42; the diversion hole 50 is close to the horizontal part 43 and the main casing 10. Because if the diversion hole 50 is not provided, the corrosive medium liquid is extremely likely to accumulate at the connection between the first vertical part 41 and the horizontal part 43 and at the connection between the H-shaped reinforcing rib 40 and the main casing 10. Therefore, setting the diversion hole 50 at the horizontal part 43 and the main casing 10 is more conducive to the discharge of the corrosive medium liquid, avoiding the corrosion of the reinforcing rib and the main casing 10, and improving the service life of the magnesium alloy casing.

[0043] Furthermore, the outer diameter of the diversion hole 50 is tangent to the horizontal part 43; or the outer diameter of the diversion hole 50 is tangent to the main casing 10. This structure makes the corrosive medium liquid easier to discharge, avoiding the corrosion of the reinforcing rib and the main casing 10, and improving the service life of the magnesium alloy casing.

[0044] Preferably, the outer diameter of the diversion hole 50 is tangent to the horizontal part 43; and the outer diameter of the diversion hole 50 is tangent to the main casing 10. As Figure 5 shown, Figure 5 it shows that the outer diameter of the diversion hole 50 is tangent to the horizontal part 43, and the outer diameter of the diversion hole 50 is tangent to the main casing 10. Based on this, the diversion effect of the diversion hole 50 is the best, avoiding the corrosion of the reinforcing rib and the main casing 10, and improving the service life of the magnesium alloy casing.

[0045] It should be noted that in the present invention, anti-corrosion is achieved through two methods: the diversion slope surface 310 and the drainage holes. In actual use, the method of drainage holes is more likely to discharge corrosive medium liquids and is also easier to process. However, since the connecting feet are required to be connected to the helicopter airframe, higher strength requirements are imposed on the connecting feet. If drainage holes are provided on the connecting feet, the strength of the connecting feet will be reduced. Therefore, the method of providing a diversion slope surface 310 on the connecting portion 31 is more preferable, which not only ensures the strength of the connecting feet but also achieves the anti-corrosion effect.

[0046] Electrochemical corrosion requires three conditions: potential difference, electrolyte (water vapor), and conductive connection. As Figure 6 shown, the main engine casing 10 and the lubricating oil sump 20 are assembled by bolts, that is, there is a conductive connection; the materials of the main engine casing 10, the lubricating oil sump, and the bolts are different, that is, there is a potential difference; corrosive medium liquids, that is, there is an electrolyte. Therefore, anti-corrosion treatment needs to be carried out on this connection structure.

[0047] Furthermore, an anti-rust sealant is provided on the joint surface of the main engine casing 10 and the lubricating oil sump 20, and the main engine casing 10 and the lubricating oil sump 20 are connected by bolts; primer, sealant, and heat-resistant paint are sequentially provided on the exposed part of the bolts. Based on this, electrochemical corrosion is avoided, and the service life of the magnesium alloy casing is increased.

[0048] Among them, the anti-rust sealant uses xj15 anti-rust sealant, and the sealant uses hm105 sealant.

[0049] Furthermore, a heat-resistant paint is provided on the surface of the magnesium alloy casing body. Based on this, corrosion is avoided, and the service life of the magnesium alloy casing is increased.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A corrosion prevention structure for a magnesium alloy casing, comprising a magnesium alloy casing body. The magnesium alloy casing body includes a main casing (10) and an oil sump (20). The main casing (10) is connected to the oil sump (20). The main casing (10) is provided with connecting legs (30), characterized in that, A flow guiding slope surface (310) is provided on the connecting part (31) of the connecting leg (30); the flow guiding slope surface (310) covers the upper surface of the entire connecting part (31); the flow guiding slope surface (310) is a smooth transition surface.

2. The anti-corrosion structure of a magnesium alloy casing according to claim 1, characterized in that A sunken threaded connection hole (320) is provided on the connecting part (31).

3. A corrosion prevention structure for a magnesium alloy casing according to claim 1, characterized in that, An H-shaped reinforcing rib (40) is provided on the main engine casing (10).

4. The anti-corrosion structure of a magnesium alloy casing according to claim 3, characterized in that A flow guiding hole (50) is provided on the H-shaped reinforcing rib (40).

5. The anti-corrosion structure of a magnesium alloy casing according to claim 4, characterized in that, The H-shaped reinforcing rib (40) includes a first vertical part (41), a second vertical part (42) and a horizontal part (43), and the horizontal part (43) is connected between the first vertical part (41) and the second vertical part (42); A flow guiding hole (50) is provided on the first vertical part (41), and a flow guiding hole (50) is provided on the second vertical part (42); The flow guiding hole (50) is close to the horizontal part (43) and the main engine casing (10).

6. The anti-corrosion structure of a magnesium alloy casing according to claim 5, characterized in that, The outer diameter of the flow guiding hole (50) is tangent to the horizontal part (43); and / or the outer diameter of the flow guiding hole (50) is tangent to the main engine casing (10).

7. The anti-corrosion structure of a magnesium alloy casing according to claim 1, characterized in that, An anti-rust sealant is provided on the joint surface of the main engine casing (10) and the lubricating oil sump (20), and the main engine casing (10) and the lubricating oil sump (20) are connected by bolts; primer, sealant and heat-resistant paint are sequentially provided on the exposed part of the bolts.

8. The anti-corrosion structure of a magnesium alloy casing according to claim 7, wherein, Heat-resistant paint is provided on the surface of the magnesium alloy casing body.

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