An aircraft ground air supply unit housing and maintenance opening method

Abstract

This invention relates to the field of air source unit technology, specifically a cover and maintenance opening method for an aircraft ground air source unit. The cover includes a side maintenance module connected to the cover body via a four-bar linkage. The four-bar linkage allows the side maintenance module to translate and rotate relative to the cover body for opening. This invention, by incorporating the side maintenance module and the four-bar linkage, enables the side maintenance module to translate and rotate relative to the cover body for opening. This differs from traditional side door opening methods that involve direct rotation around a pivot. The side maintenance module can first disengage from its contact position with the cover body before rotating, thus avoiding repeated friction between the side maintenance module and the sealing components during opening. This reduces wear on the seals, maintains the cover's sealing performance, and improves the smoothness of opening and the structural lifespan.

Description

Technical Field

[0001] This invention relates to the field of air source unit technology, and in particular to an aircraft ground air source unit cover and maintenance opening method. Background Technology

[0002] Aircraft ground air supply units are an important component of airport ground support equipment, typically used to provide compressed air for aircraft startup, air conditioning testing, and leak detection. To protect the compressors, piping, electrical components, and other parts inside the unit, existing aircraft ground air supply units are usually equipped with a casing structure. Most existing casings are of integral welded structure or bolted fully enclosed structure. While these structures meet basic protection and sealing requirements, they still have shortcomings in actual maintenance.

[0003] Existing housings typically only have conventional hinged opening structures on some sides. These opening structures can generally meet the daily maintenance needs of high-frequency maintenance parts such as engines, compressors, compressed air circuits, control air circuits, and control circuits. However, when low-frequency maintenance parts located in other locations need to be maintained, opening the conventional hinged door of the corresponding high-frequency maintenance part alone often makes it difficult to create an effective maintenance space. This can easily lead to problems such as limited maintenance space, circuitous disassembly and assembly paths for critical components, long fault diagnosis times, and the need to repeatedly disassemble and remove multiple sets of fasteners for maintenance operations such as filter replacement and condensate drainage. As a result, the convenience and efficiency of maintaining the aircraft's ground air supply unit are affected.

[0004] Therefore, how to provide an aircraft ground air source unit cover that can meet the needs of rapid opening of high-frequency maintenance parts and facilitate targeted maintenance of low-frequency maintenance parts has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0006] To address the shortcomings of existing technologies, one objective of this invention is to provide a cover for an aircraft ground air source unit.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an aircraft ground air source unit cover, including a side maintenance module, which is connected to the cover body through a four-bar linkage; wherein, the four-bar linkage is used to enable the side maintenance module to translate and rotate relative to the cover body to open.

[0008] As a preferred embodiment of the aircraft ground air source unit housing of the present invention, wherein: a sealing element is provided around the periphery of the side maintenance module, and a pressing surface that cooperates with the sealing element is provided on the housing body; wherein, the four-bar linkage is used to first drive the side maintenance module away from the pressing surface in the initial opening stage of the side maintenance module, so that the sealing element is separated from the pressing surface, and then drive the side maintenance module to rotate and open, and in the final closing stage, drive the side maintenance module to move towards the pressing surface to press the sealing element.

[0009] As a preferred embodiment of the aircraft ground air source unit housing of the present invention, two side maintenance modules are provided, respectively located on the left and right sides of the housing body, and the side maintenance modules correspond to the high-frequency maintenance area of ​​the aircraft ground air source unit; wherein, each side maintenance module is provided with a locking mechanism between itself and the housing body, the locking mechanism being used to keep the side maintenance module in a closed position and allowing the side maintenance module to be repeatedly unlocked and opened.

[0010] As a preferred embodiment of the aircraft ground air source unit cover of the present invention, the four-bar structure includes a base, a first bar, a second bar, a third bar, and a fourth bar; the base is connected to the cover body; one end of the first bar is rotatably connected to the base, and a first groove is provided on the first bar; one end of the second bar is rotatably connected to the base, and the other end is slidably connected to the first groove; one end of the third bar is rotatably connected to the base, and the other end is rotatably connected to one end of the fourth bar; a second groove is provided on the fourth bar, and the other end of the first bar is slidably connected to the second groove; the surface of the fourth bar is connected to the side maintenance module.

[0011] As a preferred embodiment of the aircraft ground air source unit cover of the present invention, a first gas spring is provided between the side maintenance module and the cover body, one end of the first gas spring is hinged to the cover body, and the other end is hinged to the inner side of the side maintenance module.

[0012] As a preferred embodiment of the aircraft ground air source unit housing of the present invention, the side maintenance module weighs 70kg-90kg, and the rated load of the four-link structure is not less than 45kg.

[0013] As a preferred embodiment of the aircraft ground air source unit cover of the present invention, wherein: a front maintenance module is provided on the front side of the cover body, the front maintenance module constitutes an integral door cover at the front end of the cover body, and the front maintenance module corresponds to the low-frequency maintenance area of ​​the aircraft ground air source unit; one side of the front maintenance module is rotatably connected to the cover body, and the other side is connected to the cover body through a second gas spring; wherein, in the closed state, the front maintenance module and the cover body together form a continuous front outer surface.

[0014] As a preferred embodiment of the aircraft ground air source unit cover of the present invention, a rear maintenance module is provided on the rear side of the cover body. The top of the rear maintenance module is rotatably connected to the cover body, and the bottom of the rear maintenance module is connected to the cover body through a third gas spring. The rear maintenance module corresponds to the low-frequency maintenance area of ​​the aircraft ground air source unit. In the closed state, the rear maintenance module and the cover body together form a continuous rear outer surface.

[0015] As a preferred embodiment of the aircraft ground air source unit cover of the present invention, the top of the cover body is provided with a top maintenance module, one side of the top maintenance module is rotatably connected to the cover body, and a fourth gas spring is provided between the top maintenance module and the cover body. The top maintenance module corresponds to the low-frequency maintenance area of ​​the aircraft ground air source unit. In the closed state, the top maintenance module and the cover body together form a continuous top outer surface.

[0016] To address the shortcomings of existing technologies, another objective of this invention is to provide a method for maintaining and opening the casing of an aircraft ground air source unit.

[0017] The present invention adopts the following technical solution: a maintenance opening method for an aircraft ground air source unit casing, comprising the following steps: determining the corresponding maintenance area according to the location of the part to be maintained; when the part to be maintained is located in the high-frequency maintenance area of ​​the casing body, releasing the locking state between the corresponding side maintenance module and the casing body, and driving the side maintenance module to move away from the pressure surface relative to the casing body through a four-bar linkage structure, so that the seal is separated from the pressure surface, and then driving the side maintenance module to rotate and open; when the part to be maintained is located in the low-frequency maintenance area of ​​the casing body, opening the front maintenance module, rear maintenance module or top maintenance module corresponding to the low-frequency maintenance area; after maintenance is completed, closing the corresponding maintenance module.

[0018] The beneficial effects of the aircraft ground air source unit cover of the present invention are as follows: By setting a side maintenance module and a four-bar linkage structure, the side maintenance module can be translated and rotated relative to the cover body to open, which is different from the traditional side door opening method of directly rotating around the pivot. This allows the side maintenance module to first disengage from the contact position with the cover body before rotating during the opening process, thereby avoiding repeated friction between the side maintenance module and the sealing parts during the opening process. This helps to reduce the wear of the seals, maintain the sealing performance of the cover, and improve the smoothness of opening and the service life of the structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the aircraft ground air source unit housing of the present invention.

[0021] Figure 2 This is a schematic diagram of the locking mechanism of the present invention.

[0022] Figure 3 This is a schematic diagram of the four-bar linkage structure of the present invention.

[0023] Figure 4 This is a schematic diagram showing the distribution of the high-frequency maintenance area and the low-frequency maintenance area of ​​the present invention.

[0024] Figure 5 This is a closed schematic diagram of the side maintenance module, front maintenance module, rear maintenance module and top maintenance module of the present invention.

[0025] Figure 6 This is a schematic diagram showing the position of the sealing element of the present invention.

[0026] Figure 7 This is a schematic diagram of the parameters of the four-bar linkage structure of the present invention.

[0027] In the diagram: 100, side maintenance module; 101, seal; 102, locking mechanism; 103, first gas spring; 200, four-bar linkage; 201, base; 202, first bar; 202a, first slide groove; 203, second bar; 204, third bar; 205, fourth bar; 205a, second slide groove; 300, cover body; 301, pressing surface; 400, front maintenance module; 401, second gas spring; 500, rear maintenance module; 501, third gas spring; 600, top maintenance module; 601, fourth gas spring; G1, high-frequency maintenance area; G2, low-frequency maintenance area. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0030] Example 1

[0031] Reference Figure 1 and Figure 3 This embodiment discloses an aircraft ground air supply unit enclosure, which includes at least a side maintenance module 100 and an enclosure body 300. The side maintenance module 100 is connected to the enclosure body 300 via a four-bar linkage 200. The enclosure body 300 constitutes the main protective shell of the aircraft ground air supply unit, used to enclose and protect the compressor, drive unit, heat exchanger, air handling components, control circuits, and related piping components. The enclosure body 300 can adopt a combined frame and cover plate structure, for example, by welding or screwing profiles to form the main frame, with sheet metal skin or composite panels fixed to the outside of the frame, to balance structural strength, installation convenience, and aesthetic integrity. The side maintenance module 100 is preferably located at a side opening of the enclosure body 300, allowing selective opening when maintenance is required to create a maintenance passage for maintenance personnel to access internal components.

[0032] Unlike existing solutions that use a single hinge to open a hinged door, in this embodiment, the side maintenance module 100 does not rotate directly around a fixed pivot relative to the housing body 300. Instead, it achieves translation and rotation relative to the housing body 300 through a four-bar linkage 200. The opening trajectory of the side maintenance module 100 is a composite trajectory. In the initial stage of opening, it first has a displacement component away from the housing body 300, and then gradually generates a significant rotation component after a necessary gap is formed. Through this movement method, the side maintenance module 100 can avoid the door panel edge directly scraping along the outer edge of the housing body 300 during the opening process, thus providing a better structural foundation for subsequent sealing, noise reduction, and aesthetic continuity design.

[0033] The working principle of this embodiment is as follows: When maintenance of internal components of the unit is required, after releasing the holding state of the side maintenance module 100, the four-bar linkage 200 drives the side maintenance module 100 to move outward relative to the cover body 300, and then continues to drive it to open around the predetermined motion center. Since the door does not simply flip along the edge, but first moves away and then flips, the avoidance relationship during the opening process can be effectively improved, providing conditions for the compression and release of the seals.

[0034] Example 2

[0035] Reference Figure 6 Based on Embodiment 1, this embodiment further defines the sealing fit between the side maintenance module 100 and the housing body 300. Specifically, the side maintenance module 100 is provided with a sealing element 101 around its periphery, and the housing body 300 is provided with a pressing surface 301 that mates with the sealing element 101. The sealing element 101 is preferably arranged continuously along the edge of the side maintenance module 100 to form a closed sealing ring around the door opening. The sealing element 101 can be a strip-shaped elastic sealing element, such as a hollow rubber sealing strip or a solid foam sealing strip. The pressing surface 301 is preferably formed at the periphery of the corresponding opening of the housing body 300, and can be an inwardly folded frame, an independent pressure strip, or a pressing flange mounted on a frame. Its surface can be designed as a flat surface, a slightly curved surface, or a partially raised surface to improve the uniformity of pressing.

[0036] The key to this embodiment is that the four-bar linkage 200 not only enables the door to open, but also works in coordination with the relative positions of the seal 101 and the pressing surface 301. This allows the side maintenance module 100 to initially move away from the pressing surface 301 during the opening phase, disengaging the seal 101 from it, before rotating to open. During the closing phase, the door first swings back, then moves towards the pressing surface 301 to press the seal 101 firmly. This avoids the problem of slippage and wear along the pressing surface that occurs with traditional hinged doors during the initial opening phase.

[0037] In practice, the compression of the seal 101 can be set according to the protection level of the enclosure, vibration conditions, and noise reduction requirements. For example, when the equipment has high requirements for waterproofing and dustproofing, the compression rate of the seal 101 can be appropriately increased; when the equipment side door is opened frequently and its lifespan is emphasized, the compression can be appropriately reduced while ensuring sealing, so as to reduce opening and closing resistance. The pressing surface 301 can be formed by folding, stamping, welding, or adding pressure strips, and preferably ensures sufficient flatness and edge rigidity to avoid air leakage, dust leakage, or noise leakage caused by insufficient local pressing. A limiting structure can also be provided between the seal 101 and the pressing surface 301 to prevent the seal from being excessively squeezed due to over-closing of the door.

[0038] The main functions and effects of this embodiment are as follows: First, by utilizing the composite trajectory provided by the four-bar linkage 200, the seal 101 disengages from the pressure surface 301 during opening, rather than sliding along the surface of the pressure surface 301, thereby significantly reducing the wear rate of the seal 101. Second, it can form a stable and uniform pressing action at the end of the door closing process, which is beneficial to improving the overall sealing performance and noise reduction performance of the cover. Third, since the working mode of the seal 101 is changed from friction to pressure, it is more conducive to extending the service life of the seal 101 and related parts. For products such as aircraft ground air supply units that need to take into account acoustic performance (overall noise ≤72dB), this embodiment has strong practical application value.

[0039] Example 3

[0040] Reference Figure 2 and Figure 4 Based on the above embodiments, this embodiment further describes the quantity, arrangement, and locking method of the side maintenance modules 100. Specifically, two side maintenance modules 100 are provided, located on the left and right sides of the housing body 300, respectively. The two side maintenance modules 100 correspond to the high-frequency maintenance area G1 of the aircraft ground air source unit. The high-frequency maintenance area G1 refers to the area where components that need to be frequently touched or observed during daily equipment inspections, routine maintenance, and troubleshooting of common faults are located, such as the compressor body, transmission components, filter components, oil-gas separator components, main control valve groups, electrical control wiring areas, and areas where commonly used testing interfaces are located. Concentrating the openings corresponding to these high-frequency maintenance objects on the left and right sides facilitates maintenance personnel to quickly complete daily maintenance in a standing position.

[0041] Furthermore, in this embodiment, the division between the high-frequency maintenance area G1 and the low-frequency maintenance area G2 is not only related to the location of the component, but also to the maintenance frequency, maintenance method, and maintenance opening requirements of the corresponding component. The high-frequency maintenance area G1 preferably corresponds to areas such as the engine's external inspection points, compressor, compressed air circuit, control air circuit, electronic control components, valves, and wiring connections—areas requiring frequent observation, measurement, tightening, disassembly and assembly of small parts, or troubleshooting. These areas are opened frequently during daily inspections, routine maintenance, and general fault diagnosis; therefore, a composite opening method using the side maintenance module 100 and the four-bar linkage structure 200 is more suitable to balance quick opening, sealing protection, and ease of operation. Conversely, the low-frequency maintenance area G2 preferably corresponds to the forward maintenance area, the rear maintenance area, and the top inspection area. These areas typically only need to be opened during regular maintenance, deep cleaning, specialized disassembly and assembly, or component replacement. Although the opening frequency is relatively low, it places higher demands on the opening range, disassembly and assembly paths, and maintenance clearance. Therefore, it is more suitable to use the front maintenance module 400, the rear maintenance module 500, and the top maintenance module 600 to form a larger overall maintenance opening. Specifically, the forward maintenance area preferably corresponds to the area where the water tank radiator, engine muffler, compressor line muffler, front-end filter, and front auxiliary components are located; the rear maintenance area preferably corresponds to the area where the rear interface, rear support, and rear auxiliary assemblies are located; and the top inspection area preferably corresponds to the area where the upper pipeline, top filter, top observation blind spot, upper connection parts, and coolant filling and replacement operations are performed. Through the above maintenance zoning design, different opening mechanisms can be matched to different areas, thereby improving the targeting and efficiency of maintenance operations while ensuring the overall strength, sealing performance, and acoustic performance of the unit.

[0042] In this embodiment, a locking mechanism 102 is provided between each side maintenance module 100 and the housing body 300. The locking mechanism 102 is used to hold the side maintenance module 100 in a predetermined closed position when it is in the closed state, and allows repeated unlocking and opening when needed. The locking mechanism 102 can be a mechanical latch, a rotary locking lock, a tensioning lock, an eccentric lock, a cam locking lock, a linkage handle lock, or a door lock structure with key management function. Preferably, the locking mechanism 102 not only achieves position holding, but also has a pressing effect, that is, during the locking process, it further pushes the side maintenance module 100 closer to the housing body 300 to improve the pressing stability of the seal 101.

[0043] A portion of the locking mechanism 102 can be fixedly installed on the inner side or outer surface of the side maintenance module 100, while another portion is fixedly installed at a corresponding position on the housing body 300, so that the two can be interlocked, pressed, or fastened together in the closed state. To improve ease of use, the locking mechanism 102 can be integrated with the handle structure, allowing maintenance personnel to unlock the device with a single rotation, press, or pull action.

[0044] The beneficial effects of this embodiment are as follows: the left and right side maintenance modules 100 correspond to the high-frequency maintenance area G1 respectively, which can shorten the maintenance path, make the door opening action more direct, and make the maintenance operation more in line with the habits of manual workstations; the locking mechanism 102 can ensure the reliable retention of the door in the closed state and prevent loosening due to vibration, impact or inertia during transportation; combined with the four-bar structure 200 and the sealing structure, it can also take into account the convenience of high-frequency opening while ensuring the appearance integrity and sealing reliability in the closed state. Therefore, this embodiment not only optimizes the maintenance logic from the perspective of spatial arrangement, but also improves the safety and durability of the cover during use from the perspective of locking and holding.

[0045] Example 4

[0046] This embodiment focuses on a detailed explanation of the specific structure, connection relationships, and motion mechanism of the four-bar linkage 200. (Refer to...) Figure 3 The four-bar linkage 200 includes a base 201, a first bar 202, a second bar 203, a third bar 204, and a fourth bar 205. The base 201 is fixed to the housing body 300 and serves as the basic mounting component and force transmission component for the entire linkage mechanism. The base 201 can be fixed to the housing body 300 by welding, bolting, riveting, or integrally forming with the frame. One end of the first bar 202 is rotatably connected to the base 201, and a first groove 202a is formed on the first bar 202. One end of the second bar 203 is rotatably connected to the base 201, and the other end is slidably connected to the first groove 202a. One end of the third bar 204 is rotatably connected to the base 201, and the other end is rotatably connected to one end of the fourth bar 205. A second groove 205a is formed on the fourth bar 205, and the other end of the first bar 202 is slidably connected to the second groove 205a. The surface of the fourth bar 205 is connected to the side maintenance module 100.

[0047] Preferably, both the first groove 202a and the second groove 205a extend along the length of the corresponding rod. The mating point between the second rod 203 and the first groove 202a, as well as the mating point between the first rod 202 and the second groove 205a, can be achieved by using a pin and groove connection. To reduce wear and improve smooth operation, a wear-resistant bushing, roller, or self-lubricating bushing can be fitted around the outer circumference of the pin.

[0048] Working principle: Multiple relatively fixed rotational fulcrums are formed on the base 201. The first rod 202, the second rod 203, and the third rod 204 swing around their corresponding fulcrums. The fourth rod 205 changes its posture under the influence of the third rod 204 and connects to the side maintenance module 100 through its surface, thereby driving the overall movement of the side maintenance module 100. The design of the first slide groove 202a and the second slide groove 205a gives this mechanism a stronger trajectory control capability compared to ordinary planar four-bar linkages. Specifically, the free end of the second rod 203 moves within the first slide groove 202a, which constrains the swing posture and velocity relationship of the first rod 202; the other end of the first rod 202 moves within the second slide groove 205a of the fourth rod 205, further changing the instantaneous motion state of the fourth rod 205.

[0049] In the specific design, the length, pivot position, slide length and slide direction of the first rod 202, the second rod 203, the third rod 204 and the fourth rod 205 can be optimized according to parameters such as door size, opening requirements, clearance space and sealing compression amount.

[0050] In this embodiment, the sealing element 101 is preferably an elastic compression type sealing element continuously arranged along the periphery of the side maintenance module 100. Specifically, the sealing element 101 can be one of the following: First, a closed-cell EPDM foam D-shaped sealing strip or a bulb-shaped sealing strip. This type of sealing element is suitable for circumferential sealing of door covers, hatches, and electrical enclosures, with a preferred compression ratio of 25% to 35%, more preferably about 30%; Second, a silicone rubber sponge sealing strip or a silicone rubber foam sealing strip. This type of sealing element has good compression recovery and strong adaptability to low and high temperatures, with a preferred compression ratio of 20% to 30%. High-performance silicone sponge can also form an effective seal at a lower compression ratio; Third, a solid EPDM strip sealing strip, a rectangular sealing strip, or a solid D-shaped sealing strip. This type of sealing element requires a relatively large clamping force, with a preferred compression ratio of 15% to 20%, generally not exceeding 25% to 30%. The selection principle for the above compression ratio is as follows: if the compression ratio is too small, it is difficult to form a stable seal; if the compression ratio is too large, it is easy to cause the permanent deformation of the seal to increase, the opening and closing resistance to increase, and the service life to decrease.

[0051] For the aircraft ground air source unit cover described in this invention, considering that it needs to be dustproof, waterproof, repeatedly opened and closed and used outdoors for a long time, the sealing element 101 is preferably a closed-cell EPDM foam D-shaped sealing strip, with a free height h0 preferably 14mm, a target compression ratio preferably 30%, and a corresponding target sealing compression amount δ preferably 4.2mm.

[0052] Reference Figure 3 , Figure 6 and Figure 7When the side maintenance module 100 moves from the closed state to the open state, it does not immediately rotate significantly. Instead, under the action of the four-bar linkage 200, it first experiences a disengagement displacement H relative to the housing body 300 in the direction away from the pressing surface 301. This disengagement displacement H is used to release the sealing element 101 from the pressing surface 301, thereby preventing the sealing element 101 from dragging or scraping along the pressing surface 301 during the subsequent rotational opening process of the side maintenance module 100. In other words, H represents the pre-release stroke required for the side maintenance module 100 to enter the rotational opening stage.

[0053] In this embodiment, the disengagement displacement H is not determined by a single dimension, but rather by the arrangement of the pivots on the first rod 202, the second rod 203, and the base 201, as well as the sliding engagement of the first slide groove 202a and the second slide groove 205a. Specifically, L202 is the effective length between the characteristic connection centers of the two ends of the first rod 202, L203 is the effective length between the connection centers of the two ends of the second rod 203, O1O2 is the distance between the centers of the two pivots of the first rod 202 and the second rod 203 on the base 201, S1 is the effective sliding length of the first slide groove 202a, and S2 is the effective sliding length of the second slide groove 205a. These parameters together constitute the initial release parameter set for the four-bar linkage 200 during the initial opening phase.

[0054] Specifically, L202 and L203 primarily affect the linkage swing amplitude and transmission relationship between the first rod 202 and the second rod 203 in the initial opening phase. O1O2 primarily affects the initial arrangement relationship between the first rod 202 and the second rod 203, as well as the movement trajectory of the side maintenance module 100 in the initial opening phase. S1 and S2 are used to provide the necessary sliding compensation stroke for the second rod 203 relative to the first rod 202, and for the first rod 202 relative to the fourth rod 205, respectively. L202, L203, and O1O2 primarily determine how the disengagement tendency is generated, while S1 and S2 primarily determine whether there is sufficient sliding space to complete the disengagement process.

[0055] In the specific design, the free height of the seal 101 is first defined as h0, and the target compression ratio is η. Then the target sealing compression amount δ satisfies: δ=h0×η.

[0056] To ensure that the initial opening stage can reliably eliminate sealing interference, the minimum normal disengagement displacement H of the side maintenance module 100 relative to the pressure surface 301 preferably satisfies: H = δ + m.

[0057] Wherein, m is the separation allowance, preferably 0.6mm to 1.0mm, more preferably 0.8mm.

[0058] Table 1 shows examples of preferred design parameters for different seals.

[0059] Table 1:

[0060] As shown in Table 1, in this embodiment, different types of seals 101 correspond to different free heights h0 and target compression ratios η, thus forming different target sealing compression amounts δ and minimum normal release displacements H. When a solid EPDM rectangular sealing strip is used, because this type of seal is relatively dense and has a relatively small compression deformation space, its target compression amount is small. Therefore, the center distance between the first rod 202, the second rod 203, the first rod 202 and the second rod 203 on the base 201, and the lengths of the first groove 202a and the second groove 205a can all be relatively small. When a silicone rubber sponge sealing strip is used, because this type of seal has good elastic recovery performance and a large allowable compression amount, the parameters related to the sealing release stroke in the four-bar structure 200 need to be appropriately increased. When using closed-cell EPDM foamed D-shaped sealing strips, due to their large free height and high target compression ratio, the resulting target sealing compression δ and minimum normal separation displacement H are further increased. Therefore, the lengths L202 of the first rod 202, L203 of the second rod 203, the center distance O1O2 of the rotating shaft, and the effective lengths S1 and S2 of the first groove 202a and the second groove 205a should all be increased accordingly to ensure that the side maintenance module 100 can first move away from the pressure surface 301 in the initial opening stage, so that the sealing element 101 is fully separated from the pressure surface 301 before entering the subsequent rotation opening stage. Therefore, the type and compression amount of the seal 101 directly determine the size configuration of the front release mechanism in the four-bar structure 200. That is, the greater the sealing compression amount, the greater the stroke parameters corresponding to the first rod 202, the second rod 203, the first slide groove 202a, and the second slide groove 205a. Conversely, the smaller the sealing compression amount, the greater the above parameters can be reduced accordingly. This ensures the reliability of the seal while avoiding redundancy in the mechanism stroke and increased opening and closing resistance.

[0061] Example 5

[0062] Reference Figure 2 Based on embodiment 4, this embodiment further provides a first gas spring 103 between the side maintenance module 100 and the housing body 300. One end of the first gas spring 103 is hinged to the housing body 300, and the other end is hinged to the inner side of the side maintenance module 100.

[0063] Preferably, the first gas spring 103 is arranged at an angle along the opening direction of the door, so that it is in a certain pre-compressed state when the door is closed, and gradually releases the supporting force during the opening process. The first gas spring 103 can be a conventional inflatable support rod, or a gas spring with a damping structure, so as to take into account both the assistance and buffering effects.

[0064] Specifically, the connection points between the first gas spring 103 and the housing body 300 and the side maintenance module 100 preferably adopt ball joints, pin joints, or ear plate hinge structures to accommodate the angle changes of the door body under the compound trajectory. The connecting support can be fixed to the frame of the housing body 300 and the reinforcing ribs or inner connecting plates of the side maintenance module 100 to avoid fatigue cracking caused by fixing only to the thin plate panel.

[0065] Example 6

[0066] This embodiment further limits the structural load-bearing capacity. Specifically, the side maintenance module 100 weighs between 70 kg and 90 kg, and the rated load of the four-bar linkage structure 200 is not less than 45 kg. The above weight range reflects the actual weight level that a single side maintenance module 100 may have under the premise of meeting the requirements of sound insulation, impact resistance, and door rigidity. For example, when the side maintenance module 100 adopts a metal panel, reinforcing ribs, an inner sound insulation layer, and a multi-point locking structure, its overall weight is more likely to fall within the above range.

[0067] In practical implementation, the door frame of the side maintenance module 100 can be constructed from steel profiles, aluminum alloy profiles, or high-strength bent parts. The panel can be made of steel plate, aluminum plate, or sandwich composite board. The inner side can be supplemented with heat insulation, sound insulation, or vibration damping layers as needed. The base 201 and each rod in the four-bar linkage structure 200 are preferably made of high-strength metal materials, such as carbon steel, stainless steel, or aluminum alloy. Bushings, needle roller bearings, or self-lubricating materials can be installed in key rotating parts to ensure operational reliability under large loads.

[0068] Table 2 shows the reference rated load of the four-bar linkage structure for different materials and specifications.

[0069] Table 2:

[0070] As shown in Table 2, under the same connection relationship, installation space, slide type, and stress conditions, the reference rated load of the four-bar linkage 200 described in this embodiment varies significantly depending on the materials and specifications. Specifically, when the first bar 202, the second bar 203, the third bar 204, and the fourth bar 205 are all made of 42CrMo4+QT quenched and tempered steel, and the bar thickness is 6mm and the width is 25mm, the reference rated load of the four-bar linkage 200 can reach 45kg, which meets the design requirement of a rated load of not less than 45kg. In comparison, if 42CrMo4+QT quenched and tempered steel is still used but the rod size is reduced to 5mm×20mm, the reference rated load drops to approximately 26.5kg; if Q235B carbon steel is used instead and the size is 6mm×25mm, the reference rated load is approximately 16.3kg, and even if the size is increased to 8mm×30mm, the reference rated load is only approximately 27.9kg; if 304 stainless steel is used instead, the reference rated load is approximately 14.4kg for the 6mm×25mm size and only approximately 24.3kg for the 8mm×30mm size; if 6061-T6 aluminum alloy is used instead, the reference rated load is approximately 19.1kg for the 6mm×25mm size and approximately 32.8kg for the 8mm×30mm size. Therefore, within the preset installation space of this embodiment, it is preferable to use 42CrMo4+QT quenched and tempered steel and 6mm×25mm rod specifications, which is more conducive to ensuring the compactness of the structure while making the four-bar structure 200 stably meet the requirement of a rated load of not less than 45kg.

[0071] Example 7

[0072] Reference Figure 4 Based on the aforementioned embodiments, this embodiment further includes a front maintenance module 400. The front maintenance module 400 is located on the front side of the housing body 300 and forms an integral door at the front end of the housing body 300. The front maintenance module 400 corresponds to the low-frequency maintenance area G2 of the aircraft ground air supply unit. Here, the low-frequency maintenance area G2 mainly refers to the area that does not require frequent contact during every routine inspection, but needs to be opened during deeper maintenance, assembly replacement, or special maintenance. Designing the front maintenance module 400 as an integral door allows for rapid exposure of the front space of the unit when extensive maintenance is required, while maintaining a good overall appearance and protective performance in normal conditions.

[0073] Specifically, one side of the front maintenance module 400 is rotatably connected to the housing body 300, and the other side is connected to the housing body 300 via a second gas spring 401. The rotatable connection side can be located on the left or right side of the front maintenance module 400, or, depending on the overall layout, on the side closer to the maintenance passage. The second gas spring 401 is preferably located on the side opposite to or slightly above the rotatable connection side to provide support when the front maintenance module 400 is opened.

[0074] When closed, the front maintenance module 400 and the housing body 300 together form a continuous front outer surface. Specifically, the rotating side of the front maintenance module 400 is connected by a rotating component, and the other three non-rotating sides that are in contact with the housing body 300 are fixed with bolts. This structure not only ensures the integrity of the front maintenance module 400 and the housing body 300, but also ensures the structural strength and acoustic performance of the housing body 300 (overall noise ≤72dB).

[0075] Unlike the side maintenance module 100, the front maintenance module 400 in this embodiment does not use a four-bar linkage opening method, but mainly uses conventional rotation opening. This is because it corresponds to the low-frequency maintenance area G2, where the opening frequency is relatively low, and more emphasis is placed on a large opening at once and structural simplification. By dividing the work between the high-frequency maintenance area G1 and the low-frequency maintenance area G2 using different types of opening modules, both high efficiency of daily maintenance and structural strength and acoustic performance of the housing body 300 can be guaranteed.

[0076] Furthermore, in this embodiment, the front maintenance module 400 preferably adopts an integral cover structure and is rotatably connected to the cover body 300 through one side. In the non-maintenance state, it is fixedly connected to the cover body 300 by bolts, rather than opening a separate local maintenance door on the surface of the front maintenance module 400. The above structural form is adopted mainly based on the following considerations: First, if a small door is added to the surface of the front maintenance module 400 cover, it will disrupt the original structural continuity of the front maintenance module 400, weaken its overall rigidity and vibration resistance, and make it difficult for it to maintain stability during transportation, handling, and unit operation vibration conditions. Second, the area corresponding to the front maintenance module 400 is preferably directly opposite the area where the engine and radiator are located. During unit operation, this area will be continuously scoured by the high-temperature hot air discharged from the engine radiator. If a small door is set in this area, the small door and its connecting parts, locking parts, and surrounding sealing parts are prone to aging, loosening, deformation, or even damage under the combined effects of hot air and vibration, thereby affecting the service life and protective reliability of the front maintenance module 400. Third, if an additional small door is set, additional auxiliary structures such as door panels, reinforcing parts, hinges, locking parts, and seals will be required, which will not only increase the amount of materials used and assembly processes, but also increase manufacturing and maintenance costs, resulting in a lower overall cost-effectiveness.

[0077] Based on this, in this embodiment, the front maintenance module 400 is directly configured as a cover structure that can be opened as a whole. When maintenance is required on the front low-frequency maintenance area G2, the bolt fixing relationship between the front maintenance module 400 and the cover body 300 can be released, and the front maintenance module 400 can be rotated and opened relative to the cover body 300, thereby forming a larger front maintenance opening, which facilitates centralized maintenance of the front components; in the non-maintenance state, the front maintenance module 400 is reliably fixed to the cover body 300 with bolts, so as to take into account the overall strength of the front cover, heat resistance and vibration resistance, and cost control.

[0078] Furthermore, in this embodiment, the front maintenance module 400 preferably adopts a lateral rotation opening method rather than an upward flip opening method. This is because external accessories are preferably arranged within the forward maintenance zone corresponding to the front maintenance module 400, including at least an engine muffler and a compressor line muffler. Since these external accessories are located in the front area and occupy the installation space above or adjacent to the front maintenance module 400, if the front maintenance module 400 adopts an upward flip opening method, it is easy for it to interfere with the engine muffler, compressor line muffler, or their connecting brackets and connecting pipe sections during the opening process, which is detrimental to the smooth opening and reliable reset of the front maintenance module 400. Therefore, in this embodiment, the front maintenance module 400 is preferably configured with a structure where one side is rotatably connected and the other side is opened with the assistance of a second gas spring 401, to avoid the limitation of the upward flip trajectory by the front accessories. Meanwhile, the front maintenance module 400 adopts an integrated cover shape, which can also provide external protection for the engine muffler and compressor line muffler when closed, reducing the risk of external collisions, rain and dust intrusion and direct exposure to local heat radiation, thereby improving the protection reliability of the front accessories and the integrity of the front shape of the whole machine.

[0079] Example 8

[0080] Reference Figure 4 Based on Embodiment 7, this embodiment further includes a rear maintenance module 500. The rear maintenance module 500 is located on the rear side of the housing body 300, with its top rotatably connected to the housing body 300 and its bottom connected to the housing body 300 via a third gas spring 501. The rear maintenance module 500 corresponds to the low-frequency maintenance area G2 of the aircraft's ground air supply unit. By designing the rear maintenance module 500 as an opening mechanism with a hinged top and assisted bottom support, it can be flipped upwards when opened, forming a relatively complete rear maintenance opening and preventing the door panel from occupying ground space downwards and to the rear.

[0081] Specifically, the rotatable connection at the top of the rear maintenance module 500 can be achieved through a hinge assembly, a pivot assembly, or a multi-point hinge structure. The third gas spring 501 is preferably located on one or both sides of the inner side of the rear maintenance module 500 to provide upward support when opened. Since the rear maintenance module 500 corresponds to the rear area of ​​the equipment and is typically used to expose the rear heat exchanger, exhaust passage, cable interface, accessory devices, or rear structural components, its opening mechanism is more suitable for an upward-opening structure to obtain a larger operating clearance. In the closed state, the rear maintenance module 500 and the housing body 300 together form a continuous rear end outer surface, reducing the protruding structure at the rear of the equipment and facilitating transportation, parking, and protection.

[0082] Furthermore, in this embodiment, the rotational connection at the top of the rear maintenance module 500 is preferably achieved through rotating shaft assemblies located on the left and right sides. Specifically, the rotating shaft assemblies can be fixed to the upper two sides of the rear maintenance module 500 and the corresponding two-side support parts of the cover body 300, so that the rear maintenance module 500 shares the weight of the door and the opening load on both sides during opening and closing. This structural form of sharing the load on both sides improves the overall load-bearing capacity and connection stability of the rotating connection of the rear maintenance module 500, avoiding excessive force on one side leading to local deformation, loosening of the connection, or long-term fatigue damage. It also helps ensure the posture stability of the rear maintenance module 500 during the upward flipping process, making its opening trajectory smoother and more reliable. Furthermore, after the rear maintenance module 500 is flipped upward to the open position, its door panel body can be positioned above the maintenance personnel, thus forming a certain upper shielding effect. In outdoor maintenance scenarios, this can provide some sunshade, wind protection, or prevent falling debris for maintenance personnel, improving the operating environment during rear maintenance and enhancing the convenience of rear-side maintenance.

[0083] In specific implementation, since the rear maintenance module 500 corresponds to the low-frequency maintenance area G2 of the aircraft ground air source unit, the rotating side of the rear maintenance module 500 is connected by a rotating component, and the other three non-rotating sides that are in contact with the housing body 300 are fixed with bolts to ensure the integrity of the rear maintenance module 500 and the housing body 300, and also to ensure the structural strength and acoustic performance of the housing body 300 (overall noise ≤72dB).

[0084] Example 9

[0085] Reference Figure 4 and Figure 5Based on Embodiment 7 or Embodiment 8, this embodiment further includes a top maintenance module 600. The top maintenance module 600 is located on the top of the housing body 300, with one side rotatably connected to the housing body 300. A fourth gas spring 601 is provided between the top maintenance module 600 and the housing body 300. The top maintenance module 600 corresponds to the low-frequency maintenance area G2 of the aircraft ground air source unit. In the closed state, the top maintenance module 600 and the housing body 300 together form a continuous top outer surface. This continuous outer surface facilitates rainwater drainage, reduces dust accumulation, and maintains the regularity of the overall equipment outline.

[0086] The top maintenance module 600 is mainly used to expose the top area of ​​the unit when needed, such as for inspection and maintenance of top piping, ventilation structures, hoisting interfaces, upper cable routing, or the upper assembly space of large components. After being rotatably connected to the housing body 300 on one side, it can adopt a single-sided flip-top structure. The fourth gas spring 601 is located between the top maintenance module 600 and the housing body 300 to provide assistance and support during opening.

[0087] Furthermore, in addition to maintaining top pipelines, top filters, top blind spots, upper connection points, and upper disassembly / reassembly paths, the top maintenance area is preferably used for coolant filling and replacement operations. Specifically, when the coolant filling port, replenishment port, drain-related interface, or upper connection point related to coolant circulation of the aircraft ground air supply unit is located on or near the top of the housing body 300, maintenance personnel can open the top maintenance module 600 to complete coolant level checks, replenishment, old fluid replacement, and related interface checks from top to bottom. Since such operations are usually not part of daily inspection items but occur more frequently during periodic maintenance, special maintenance, or replacement operations, classifying them as low-frequency maintenance area G2 is more in line with the actual maintenance needs of the aircraft. By corresponding the coolant filling and replacement paths to the top maintenance module 600, it not only helps reduce interference with the lateral high-frequency maintenance area G1 but also makes full use of the vertical operating space after the top is opened, improving the convenience of filling, replacement, and cleaning operations.

[0088] Preferably, the hinge assembly can be located on the left or right edge of the top maintenance module 600, and the fourth gas spring 601 is located on the side opposite to the hinge side or at a slightly centered position, so as to provide continuous assistance support during the opening of the top maintenance module 600. With the above structural configuration, the opening angle of the top maintenance module 600 can preferably reach 135°, so that the top maintenance module 600 can avoid the head movement area of ​​the maintenance personnel as much as possible after opening, and avoid the top cover body from obstructing the upper operating space, so as to facilitate the maintenance personnel to observe, inspect, disassemble, and clean the top of the unit and the upper internal components from top to bottom.

[0089] More preferably, the inner side of the top maintenance module 600 is provided with a top-embedded LED maintenance light strip. The LED maintenance light strip can be arranged along the length and / or width direction of the top maintenance module 600, and is preferably embedded in the edge area of ​​the inner surface of the top maintenance module 600, between the reinforcing ribs, or in a preset mounting groove. The LED maintenance light strip preferably uses a neutral white light source with a color temperature of 5000K, and its illuminance is preferably not less than 300lx. The LED maintenance light strip with the above parameters can provide a lighting effect close to natural white light, enabling maintenance personnel to more clearly identify the pipes, joints, fasteners, cables and surface conditions inside the unit during the maintenance process, avoiding the impact of yellow or blue light on the accuracy of identification; on the other hand, the illuminance of not less than 300lx can form a relatively uniform supplementary light for the top area of ​​the unit and the internal area near the top after the top cover is opened, thereby effectively eliminating the top maintenance blind spot caused by the cover structure, component stacking or insufficient ambient light.

[0090] The beneficial effects of this embodiment are as follows: by setting the top maintenance module 600, the low-frequency maintenance area G2 can be quickly exposed from above, which is particularly suitable for maintenance scenarios that require hoisting, removal, or observation from above; the fourth gas spring 601 can reduce the opening resistance of the flip-up door panel and ensure opening stability; after the top maintenance module 600 is closed, it forms a continuous top outer surface with the cover body 300, which can take into account appearance, protection, and structural integrity. Thus, the present invention constructs a multi-directional cover opening system covering different maintenance frequency areas through the side maintenance module 100, front maintenance module 400, rear maintenance module 500, and top maintenance module 600.

[0091] Example 10

[0092] This embodiment discloses a maintenance opening method for the casing of an aircraft ground air source unit. Based on the aforementioned casing structure, this method can automatically match or manually select the appropriate opening path according to the location of the part to be maintained, thereby achieving differentiated maintenance for high-frequency maintenance area G1 and low-frequency maintenance area G2.

[0093] Specifically, the steps include: Step S1, determining the corresponding maintenance area based on the location of the part to be maintained. This step can be determined by maintenance personnel based on the maintenance manual, equipment layout, or fault symptoms, or it can be assisted by the control system, condition monitoring system, or fault diagnosis information. For example, when it is necessary to inspect the side filter, oil-gas separator, compression components, or major control components, it can be determined as a high-frequency maintenance area G1; when it is necessary to perform a large-scale assembly overhaul, deep internal cleaning, or replacement of large components, it can be determined as a low-frequency maintenance area G2.

[0094] Furthermore, in this embodiment, when the object to be maintained is an external inspection point of the engine, compressor, compressed air circuit, control air circuit, electronic control components, valves, or wiring parts, it is preferably identified as a high-frequency maintenance area G1, and the corresponding side maintenance module 100 is opened; when the object to be maintained is a water tank radiator, engine muffler, compressed air line muffler, front-end filter, or front auxiliary component, it is preferably identified as a forward maintenance zone, and the corresponding front maintenance module 400 is opened; when the object to be maintained is a rear interface, rear support, or rear auxiliary assembly, it is preferably identified as a rear maintenance zone, and the corresponding rear maintenance module 500 is opened; when the object to be maintained is an upper pipeline, top filter, top blind spot, upper connection part, or coolant filling and replacement related parts, it is preferably identified as a top inspection area, and the corresponding top maintenance module 600 is opened. Through the above-mentioned zoning judgment rules, maintenance personnel can quickly select the appropriate opening module according to the location and maintenance nature of the object to be maintained, reducing unnecessary large-scale opening operations and improving the targeting and efficiency of the maintenance process.

[0095] Step S2: When the part to be maintained is located in the high-frequency maintenance area G1 of the housing body 300, the locking state between the corresponding side maintenance module 100 and the housing body 300 is released. Specifically, this can be done by operating the handle, knob, or lock cylinder of the locking mechanism 102 to switch it from the holding state to the opening state. Subsequently, the four-bar linkage 200 drives the side maintenance module 100 to move away from the pressing surface 301 relative to the housing body 300, so that the seal 101 is disengaged from the pressing surface 301, and then the side maintenance module 100 is rotated to open. The core of the above steps is that the door does not directly flip over, but first disengages from the pressing position before opening, thereby avoiding the seal 101 from being scratched or damaged during the opening process. After opening to the correct position, the first gas spring 103 can provide auxiliary support for the door, so that maintenance personnel can free their hands for inspection.

[0096] Step S3: When the part to be maintained is located in the low-frequency maintenance area G2 of the housing body 300, open the front maintenance module 400, rear maintenance module 500, or top maintenance module 600 corresponding to the low-frequency maintenance area G2 according to the actual maintenance needs. If access to the front space of the equipment is required, the front maintenance module 400 can be opened; if access to the rear space of the equipment is required, the rear maintenance module 500 can be opened; if observation, hoisting, or disassembly is required from above, the top maintenance module 600 can be opened. Since these maintenance modules mainly undertake low-frequency maintenance tasks, a single module can be opened according to the maintenance depth and disassembly path, or two or more modules can be combined and opened when necessary to obtain a larger maintenance window.

[0097] Step S4: After maintenance is completed, close the corresponding maintenance module. For the side maintenance module 100, when closing, the four-bar linkage 200 first drives the door to swing back, and then at the end of the closing phase, it moves towards the pressing surface 301 to press the seal 101. Subsequently, the locking mechanism 102 holds the door in the closed position. For the front maintenance module 400, rear maintenance module 500, and top maintenance module 600, they can smoothly return to their positions with the assistance of a gas spring and be fixed in the closed state by the corresponding locking or retaining components.

[0098] For the high-frequency maintenance area G1, the side maintenance module 100, which is easy to open and close at high frequencies and is friendly to sealing, is preferred; for the low-frequency maintenance area G2, front, rear, and top maintenance modules that can provide larger maintenance openings are used. This zoned maintenance method can significantly reduce unnecessary large-scale opening operations, improve daily maintenance efficiency, and at the same time provide sufficient disassembly and assembly space when in-depth maintenance is required.

[0099] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A housing for an aircraft ground air supply unit, characterized in that: include, Side maintenance module (100), which is connected to the housing body (300) via a four-bar linkage (200); The four-bar linkage (200) is used to allow the side maintenance module (100) to translate and rotate relative to the housing body (300) to open. The side maintenance module (100) is provided with a sealing element (101) around its periphery, and the cover body (300) is provided with a pressing surface (301) that cooperates with the sealing element (101). The four-bar linkage (200) is used to first drive the side maintenance module (100) away from the pressure surface (301) in the initial opening stage, so that the seal (101) is separated from the pressure surface (301), and then drive the side maintenance module (100) to rotate and open. In the final closing stage, the side maintenance module (100) is driven to move towards the pressure surface (301) to press the seal (101).

2. The aircraft ground air source unit housing as described in claim 1, characterized in that: Two side maintenance modules (100) are provided, and are respectively located on the left and right sides of the housing body (300). The side maintenance modules (100) correspond to the high-frequency maintenance area (G1) of the aircraft ground air source unit. Each of the side maintenance modules (100) is provided with a locking mechanism (102) between itself and the housing body (300). The locking mechanism (102) is used to keep the side maintenance module (100) in a closed position and allow the side maintenance module (100) to be repeatedly unlocked and opened.

3. The aircraft ground air source unit housing as described in claim 2, characterized in that: The four-bar linkage (200) includes a base (201), a first bar (202), a second bar (203), a third bar (204), and a fourth bar (205); The base (201) is connected to the cover body (300); One end of the first rod (202) is rotatably connected to the base (201), and a first groove (202a) is provided on the first rod (202). One end of the second rod (203) is rotatably connected to the base (201), and the other end is slidably connected to the first groove (202a); One end of the third rod (204) is rotatably connected to the base (201), and the other end is rotatably connected to one end of the fourth rod (205); The fourth rod (205) has a second sliding groove (205a), and the other end of the first rod (202) is slidably connected to the second sliding groove (205a). The surface of the fourth rod (205) is connected to the side maintenance module (100).

4. The aircraft ground air source unit housing as described in claim 3, characterized in that: A first gas spring (103) is provided between the side maintenance module (100) and the cover body (300). One end of the first gas spring (103) is hinged to the cover body (300), and the other end is hinged to the inner side of the side maintenance module (100).

5. The aircraft ground air supply unit housing as described in any one of claims 2 to 4, characterized in that: The side maintenance module (100) weighs 70kg-90kg, and the rated load of the four-bar linkage (200) is not less than 45kg.

6. The aircraft ground air supply unit housing as described in any one of claims 2 to 4, characterized in that: The front side of the housing body (300) is provided with a front maintenance module (400), which constitutes the overall door cover at the front end of the housing body (300). The front maintenance module (400) corresponds to the low-frequency maintenance area (G2) of the aircraft ground air source unit. One side of the front maintenance module (400) is rotatably connected to the cover body (300), and the other side is connected to the cover body (300) via a second gas spring (401); In the closed state, the front maintenance module (400) together with the housing body (300) forms a continuous front outer surface.

7. The aircraft ground air source unit housing as described in claim 6, characterized in that: The rear side of the housing body (300) is provided with a rear maintenance module (500). The top of the rear maintenance module (500) is rotatably connected to the housing body (300), and the bottom of the rear maintenance module (500) is connected to the housing body (300) through a third gas spring (501). The rear maintenance module (500) corresponds to the low-frequency maintenance area (G2) of the aircraft ground air source unit. In the closed state, the rear maintenance module (500) together with the housing body (300) forms a continuous rear outer surface.

8. The aircraft ground air source unit housing as described in claim 7, characterized in that: The top of the cover body (300) is provided with a top maintenance module (600). One side of the top maintenance module (600) is rotatably connected to the cover body (300), and a fourth gas spring (601) is provided between the top maintenance module (600) and the cover body (300). The top maintenance module (600) corresponds to the low-frequency maintenance area (G2) of the aircraft ground air source unit. In the closed state, the top maintenance module (600) together with the cover body (300) forms a continuous top outer surface.

9. A method for opening and maintaining the casing of an aircraft ground air supply unit, characterized in that: Includes the following steps, Determine the corresponding maintenance area based on the location of the part to be maintained; When the part to be maintained is located in the high-frequency maintenance area (G1) of the housing body (300), the locking state between the corresponding side maintenance module (100) and the housing body (300) is released, and the side maintenance module (100) is moved away from the pressure surface (301) relative to the housing body (300) by the four-bar linkage (200) so that the seal (101) is separated from the pressure surface (301), and then the side maintenance module (100) is rotated to open. When the part to be maintained is located in the low-frequency maintenance area (G2) of the housing body (300), the front maintenance module (400), rear maintenance module (500) or top maintenance module (600) corresponding to the low-frequency maintenance area (G2) is activated. After maintenance is complete, shut down the corresponding maintenance module.

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