Sand control panel and split gas entry guard

Abstract

The application discloses an air inlet protection device with detachable sand prevention panel and air inlet flow channel, and relates to the technical field of helicopter engine air inlet. The air inlet protection device comprises a sand prevention panel assembly and an air inlet flow channel. The sand prevention panel assembly and the air inlet flow channel are detachably assembled together. The sand prevention panel assembly and the air inlet flow channel are assembled together and then installed on a helicopter. The periphery of the sand prevention panel assembly and the periphery of the air inlet flow channel are fixed by bolts and backup nuts. The middle edge of the air inlet flow channel is inserted into the sand prevention panel assembly. The sand prevention panel and the air inlet flow channel are connected and disassembled by bolts and insertion. The upper, lower, front and rear edges of the sand prevention panel and the air inlet flow channel are reliably connected by bolts, so that the sand prevention panel and the air inlet flow channel are conveniently disassembled. The sand prevention panel assembly and the air inlet flow channel are connected by insertion at the middle edge of the air inlet flow channel, so that the connection and fixation of the middle edge of the air inlet flow channel which is shielded are solved.

Description

Technical Field

[0001] This invention relates to the field of helicopter engine air intake technology, specifically to an air intake protection device in which the sandproof panel and the air intake duct can be separated. Background Technology

[0002] A certain type of helicopter requires that the sandproof panel and the air intake duct be separable, and both need to be easily detachable from the helicopter. This is different from the previous situation where the sandproof panel and the air intake duct were integrated or only the sandproof panel was removed from the helicopter. This is a new requirement. In response to this situation, the present invention proposes a novel solution. Summary of the Invention

[0003] The purpose of this invention is to provide an air intake protection device with a detachable sandproof panel and air intake channel to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an air intake protection device with a detachable sandproof panel and an air intake duct, comprising a sandproof panel assembly and an air intake duct, wherein the sandproof panel assembly and the air intake duct are detachably assembled together, and the sandproof panel assembly and the air intake duct are installed on a helicopter after being assembled together.

[0005] The periphery of the sandproof panel assembly and the periphery of the air intake channel are both fixed by bolts and spare nuts;

[0006] The air intake channel is inserted into the sandproof panel assembly at the middle edge.

[0007] Further regarding this solution, the sandproof panel assembly includes an inner sandproof panel, an outer sandproof panel, a firewall, a ventilation hood, and an inner panel for the sand discharge chamber;

[0008] The periphery of the sandproof panel assembly is provided with holes with spare nuts, and the periphery of the air intake channel is provided with bolt through holes. The holes with spare nuts on the sandproof panel assembly correspond one-to-one with the bolt through holes around the air intake channel.

[0009] Furthermore, the middle edge of the air intake channel is inserted into the sand discharge cavity inner plate of the sandproof panel assembly.

[0010] Further, the inner plate of the sand discharge chamber is first connected to the inner plate of the sandproof panel with rivets, and the front edge continues to extend, first slightly bent downward and then bent forward and downward to form a first V-shaped structure.

[0011] Furthermore, the middle edge of the air intake channel has a backward-facing flange, forming a second V-shaped structure. The first V-shaped structure and the second V-shaped structure are interlocked to form a closed effect, and the tip of the second V-shaped structure will not touch the inner panel of the sandproof panel.

[0012] Further, when assembling the air intake duct and the sandproof panel assembly, the tail of the air intake duct passes through the opening on the firewall. After the first V-shaped structure and the second V-shaped structure are inserted to the bottom, the air intake duct and the sandproof panel assembly fit together tightly. Combined with the structural strength of the second V-shaped structure of the air intake duct, the middle edge of the air intake duct remains stable under vibration conditions.

[0013] Further, a soft material is provided between the first V-shaped structure and the second V-shaped structure. The soft material is disposed on the surface of the first V-shaped structure, and / or on the surface of the second V-shaped structure, and / or simultaneously on the surfaces of the first V-shaped structure and the second V-shaped structure. The soft material, in conjunction with the first V-shaped structure and the second V-shaped structure, isolates external air and airflow in the intake channel, and plays an isolation and buffering role during assembly or vibration, and compensates for manufacturing errors.

[0014] Furthermore, the combination of the first V-shaped structure and the second V-shaped structure isolates the rivets connecting the inner plate of the sand discharge chamber and the inner plate of the sandproof panel outside the air intake channel, preventing the rivets from accidentally falling out and entering the air intake channel.

[0015] Furthermore, the intake duct has two concentric rings near the engine, connected by a herringbone-shaped opening in the middle, to prevent turbulence during intake.

[0016] Furthermore, the intake duct is provided with an openable inspection hole above the engine position for inspecting the engine blades.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The sandproof panel and the detachable air intake protection device of the air intake duct are connected by bolts and plugs, which solves the connection and disassembly problems of the sandproof panel and the air intake duct. The top, bottom, front, and back sides of both are reliably connected by bolts, which facilitates disassembly and assembly.

[0019] At the middle edge of the air intake channel, the sandproof panel assembly and the air intake channel are connected by their respective structural plugs, which solves the problem of connection and fixation at the middle edge of the air intake channel that is blocked.

[0020] There are no standard parts on the top, bottom, front, back, and four sides of either of them in the air intake passage, thus avoiding the problem of standard parts entering the engine.

[0021] Without increasing the number of parts or sacrificing the internal volume of the air intake channel, the rivets used to fix the sandproof panel assembly in the middle of the air intake channel are isolated outside the air intake channel, ensuring that there are no rivets inside the air intake channel.

[0022] The middle edge of the air intake channel has a rearward flange, which not only serves as a connection but also structurally strengthens the middle edge of the air intake channel.

[0023] There is a soft material between the first V-shaped opening and the second V-shaped opening. When the two V-shaped openings are put together, they can seal and isolate the external air and the airflow in the air intake channel, and also play a role in isolation and buffering during assembly or vibration, and also play a role in compensating for manufacturing errors.

[0024] When assembling the air intake channel and the sandproof panel assembly, the two V-shaped openings interlock, ensuring that blind installation is very easy.

[0025] After the two V-shaped openings are inserted to the bottom, the air intake channel and the sandproof panel assembly fit together tightly. Combined with the strength of the flange structure at the middle edge of the air intake channel, a limiting effect is formed in all directions. Under vibration conditions, the middle edge of the air intake channel will not move randomly.

[0026] The air intake duct has two rings near the engine, connected by a herringbone-shaped opening in the middle, which can prevent turbulence from forming during air intake. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the disassembled structure of the air intake channel and sandproof panel assembly of the present invention;

[0029] Figure 3 This is a schematic diagram of the overall structure of the air intake channel of the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the sandproof panel assembly of the present invention;

[0031] Figure 5 This is a cross-sectional structural diagram of the present invention;

[0032] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0033] Figure 7 This is a schematic diagram of the cross-sectional structure of the present invention after the bolts have been removed;

[0034] Figure 8 This is a schematic diagram of the slightly rotating structure of the air intake channel of the present invention;

[0035] Figure 9 This is a schematic diagram of the forward-extraction structure of the air intake channel of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure after the air intake channel of the present invention has been removed.

[0037] In the diagram: 1. Air intake channel; 2. Bolt through hole; 3. Firewall; 4. Sandproof panel assembly; 5. Hole with spare nut; 6. Bolt; 7. Spare nut; 8. Ventilation hood; 9. Inner panel of sandproof panel; 10. Inner panel of sand discharge cavity; 11. First V-shaped structure; 12. Rivet; 13. Second V-shaped structure. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Overview of the intake protection device principle: After the engine starts, air enters through the vortex tube on the sand shield panel. The vortex tube separates clean air from sand and dust and other impurities. Clean air enters the engine through the intake air passage, while sand and dust and other impurities enter the sand discharge chamber and are extracted by the sand discharge fan.

[0040] To achieve the requirement of detachable sandproof panel and air intake channel, the connection and disassembly of the sandproof panel assembly and air intake channel need to be addressed. Practice has shown that the upper, lower, front, and rear mounting edges of both can be connected with bolts. The connected state is as follows... Figure 1 As shown; however, at the edge of the middle of the intake channel (such as...) Figure 3 (As shown) Because of the sandproof panel assembly and the double-sided shielding of the air intake channel, it is inaccessible and cannot be operated.

[0041] If the middle part of the intake duct is not reliably connected to the sand guard panel, problems such as deformation of the intake duct and gas leakage will occur under the impact of high-speed airflow and pressure difference, causing the intake protection device to lose its function. At the same time, it is also necessary to ensure that there are no standard parts such as bolts and rivets in the intake duct, because the falling off of standard parts will damage the engine.

[0042] Considering requirements such as product reliability, number of parts, sealing, and that standard parts should not be used in the engine, this problem is difficult to solve.

[0043] like Figures 1-10As shown, this invention provides a technical solution: a detachable air intake protection device with a sandproof panel and an air intake duct. This air intake protection device is specifically designed for helicopters. Its core feature is that the sandproof panel assembly 4 and the air intake duct 1 adopt a detachable assembly structure. After assembly, the two are installed on the helicopter to achieve air intake protection and related functions. In terms of connection, the periphery of the sandproof panel assembly 4 is specially provided with holes 5 with spare nuts, and the periphery of the corresponding air intake duct 1 is machined with bolt through holes 2. These holes 5 with spare nuts and bolt through holes 2 are precisely arranged in a one-to-one correspondence. By passing bolts 6 through the bolt through holes 2 and holes 5 with spare nuts in sequence and screwing them with spare nuts 7, a firm connection between the sandproof panel assembly 4 and the air intake duct 1 can be completed. This screwing method fully meets the detachable requirements of the two while having extremely high stability and reliability. It is the preferred solution for connecting such components under current technical conditions. After adopting the design of peripheral bolt connection 6, the periphery of the air intake duct 1 and the sandproof panel does not need to be designed with complex special structures, effectively simplifying the processing difficulty of the overall structure.

[0044] The sandproof panel assembly 4 includes an inner sandproof panel 9, an outer sandproof panel, a firewall 3, a ventilation hood 8, and an inner sand discharge chamber panel 10. The inner sand discharge chamber panel 10 and the inner sandproof panel 9 are first connected and fixed with rivets 12. The front edge of the inner sand discharge chamber panel 10 does not end there, but continues to extend forward. During the extension process, it is first slightly bent downward, and then further bent in the forward and downward direction, finally forming a unique first V-shaped structure 11.

[0045] Correspondingly, the middle edge of the air intake channel 1 is designed with a rearward-facing flange structure. The barbed design at this flange forms a second V-shaped structure 13. When the sandproof panel assembly 4 is assembled with the air intake channel 1, the first V-shaped structure 11 and the second V-shaped structure 13 can precisely interlock, forming a good sealing effect and effectively ensuring the airflow channel's airtightness. During the assembly process, the tail of the air intake channel 1 passes through a pre-set opening on the firewall 3. When the first V-shaped structure 11 and the second V-shaped structure 13 are inserted to the bottom, the air intake channel 1 and the sandproof panel assembly 4 achieve a tight fit. Simultaneously, thanks to… The structural strength of the flanged edge at the middle of the air intake duct 1 provides restraint in all directions. Even under vibration conditions, the middle edge of the air intake duct 1 maintains a stable structural state and precise fit with the sandproof panel assembly 4, without loosening or displacement. Furthermore, the tip of the second V-shaped structure 13 does not come into contact with the inner panel 9 of the sandproof panel. Since the inner panel 9 is made of metal or alloy, the design of the second V-shaped structure 13 fundamentally avoids surface damage caused by contact with the inner panel 9, effectively protecting the components.

[0046] To further optimize assembly and performance, a soft material is provided between the first V-shaped structure 11 and the second V-shaped structure 13. This soft material can be made of materials with good elasticity and sealing properties, such as rubber, silicone, or latex. The arrangement of the soft material is flexible and diverse. It can be placed alone on the surface of the first V-shaped structure 11, alone on the surface of the second V-shaped structure 13, or simultaneously on the surfaces of both the first V-shaped structure 11 and the second V-shaped structure 13. These soft materials work together with the first V-shaped structure 11 and the second V-shaped structure 13 to effectively isolate external air from the airflow in the intake channel 1, ensuring the purity of the intake air. On the other hand, they can act as an isolation during assembly, preventing direct friction and collision between the two V-shaped structures. Under vibration conditions, they can also act as a buffer, reducing the impact between components. At the same time, they can effectively compensate for dimensional errors that may occur during manufacturing, ensuring a tight fit.

[0047] In addition, the design of the first V-shaped structure 11 and the second V-shaped structure 13 also has an important protective function. The insertion and connection of the two can completely isolate the rivets 12 connecting the inner plate 10 of the sand discharge chamber and the inner plate 9 of the sandproof panel in the external space of the air intake channel 1. This design structurally avoids the risk of the rivets 12 accidentally falling out and entering the air intake channel 1, thus avoiding potential damage to subsequent key components such as the engine.

[0048] In the structural design of the intake duct 1, a two-ring structure is adopted near the engine, with the inner and outer rings connected by a herringbone opening structure. This unique herringbone opening structure design can effectively prevent the formation of turbulence in the gas during the intake process, ensuring the smoothness and stability of the intake. In contrast, traditional similar products do not have a herringbone structure in this position. If the gas forms vortices in this area, it will be difficult to ensure the uniformity of the intake pressure around this cross section, which may affect the engine's working efficiency.

[0049] Meanwhile, an openable inspection hole is specially provided on the intake duct 1 near the engine blades. Staff can use an endoscope to directly observe the real-time status of the engine blades through this inspection hole. First, this location does not disrupt the overall structural integrity of the intake panel, allowing the intake panel to maintain a simple structural form and ensuring unobstructed, smooth, and efficient air intake. Second, this location is close to the engine, providing great convenience for the insertion and operation of the endoscope, allowing observation to be completed without complicated procedures. In addition, a removable cover plate is already provided above this location. Opening the inspection hole here eliminates the need for additional holes in other locations, simplifying the manufacturing process and avoiding the potential impact on the component structure caused by additional holes.

[0050] The disassembly process is used as an example to illustrate the assembly relationship between the air intake channel 1 and the sandproof panel assembly 4.

[0051] First step, such as Figure 7 As shown, remove the bolts 6 on the top, bottom, front, and back sides to release the air intake channel 1 from its fixation.

[0052] The second step, as Figure 8 As shown, with point A as the axis of rotation or the center of rotation, rotate the air intake channel 1 slightly in the direction of the arrow so that the front end of the air intake channel 1 is dislodged from the position of the sandproof panel assembly 4. When the front end of the air intake channel 1 is not obstructed, the air intake channel 1 can move forward (the front end of the sandproof panel assembly 4 is partially obstructed, which hinders the forward movement of the air intake channel 1. This obstruction forms a stepped structure. After the air intake channel 1 is installed, it ensures a smooth surface and is used to limit the position of the air intake channel 1, ensuring that the position of the air intake channel 1 is accurate in the front-back direction).

[0053] The third step is to move the air intake channel 1 forward a little to ensure that the tail of the air intake channel 1 passes through the round hole of the firewall 3. At the same time, the second V-shaped structure 13 of the air intake channel 1 also disengages from the V-shaped groove formed by the inner plate 10 of the sand discharge chamber and the inner plate 9 of the sandproof panel.

[0054] Step four, as Figure 9 As shown, move the air intake channel 1 forward and downward to completely separate the two and complete the disassembly process.

[0055] The assembly process for the air intake protection device is the reverse of the above steps.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A detachable air inlet protection device of sand prevention panel and air inlet channel, comprising a sand prevention panel assembly (4) and an air inlet channel (1), characterized in that: the sand prevention panel assembly (4) and the air inlet channel (1) are detachably assembled together, and the sand prevention panel assembly (4) and the air inlet channel (1) are assembled together and installed on a helicopter; the periphery of the sand prevention panel assembly (4) and the periphery of the air inlet channel (1) are connected and fixed by bolts (6) and nuts (7), and the middle edge of the air inlet channel (1) is inserted into the sand prevention panel assembly (4); the sand prevention panel assembly (4) comprises a sand prevention panel inner panel (9) and a sand discharge cavity inner panel (10); the sand discharge cavity inner panel (10) is first connected with the sand prevention panel inner panel (9) by rivets (12), and the front edge is continuously extended, slightly bent downward, and then bent downward to the front and downward direction to form a first V-shaped structure (11); the middle edge of the air inlet channel (1) has a rearward turned edge to form a second V-shaped structure (13), the first V-shaped structure (11) and the second V-shaped structure (13) are inserted into each other to form a closed effect, and the tip of the second V-shaped structure (13) does not touch the sand prevention panel inner panel (9).

2. The detachable gas inlet protection device of claim 1, wherein: The sand prevention panel assembly (4) further comprises a sand prevention panel outer panel, a fire wall (3) and a ventilation cover (8); the periphery of the sand prevention panel assembly (4) is provided with holes (5) with nuts, and the periphery of the air inlet channel (1) is provided with bolt through holes (2); the holes (5) with nuts on the sand prevention panel assembly (4) correspond to the bolt through holes (2) on the periphery of the air inlet channel (1) one by one.

3. The detachable gas inlet protection device of claim 1, wherein: The middle edge position of the air inlet channel (1) is inserted into the sand discharge cavity inner panel (10) of the sand prevention panel assembly (4).

4. The detachable gas inlet protection device of claim 1, wherein: When the air inlet channel (1) and the sand prevention panel assembly (4) are assembled, the tail of the air inlet channel (1) passes through the opening on the fire wall (3), the first V-shaped structure (11) and the second V-shaped structure (13) are inserted into each other to the bottom, the air inlet channel (1) is tightly matched with the sand prevention panel assembly (4), and the structure strength of the second V-shaped structure (13) of the air inlet channel (1) makes the middle edge of the air inlet channel (1) stable under vibration working condition.

5. The detachable gas inlet protection device of claim 1, wherein: There is a soft material between the first V-shaped structure (11) and the second V-shaped structure (13), the soft material is arranged on the surface of the first V-shaped structure (11), and / or the soft material is arranged on the surface of the second V-shaped structure (13), and / or the soft material is arranged on the surfaces of the first V-shaped structure (11) and the second V-shaped structure (13); the soft material cooperates with the first V-shaped structure (11) and the second V-shaped structure (13) to isolate external air and air flow of the air inlet channel (1), and plays a role of isolation and buffering during assembly or vibration, and makes up for manufacturing errors.

6. A sand control faceplate and inlet flow passage detachable inlet guard according to claim 1, wherein: The cooperation of the first V-shaped structure (11) and the second V-shaped structure (13) isolates the rivets (12) connecting the sand discharge cavity inner panel (10) and the sand prevention panel inner panel (9) outside the air inlet channel (1), so as to avoid that the rivets (12) enter the air inlet channel (1) when they are accidentally detached.

7. The detachable gas inlet protection device of claim 1, wherein: The air inlet channel (1) has two circles of inside and outside near the position of the engine, which are connected by a herringbone opening structure to avoid turbulence when air is inhaled.

8. The detachable gas inlet protection device of claim 1, wherein: The air inlet channel (1) is provided with an openable inspection hole above the position near the engine for checking the engine blades.

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