Auxiliary power system air supply device

Abstract

This invention relates to the field of auxiliary power technology, specifically to an air supply device for an auxiliary power system. The device includes an intake duct housing, an intake air shroud, an intake duct outer ring, an intake volute, a toothed ring, a locking unit, and a rotor. The axial end face of the intake air shroud is coaxially abutted against the intake duct housing. The intake duct outer ring includes an outer sealing cylinder and an outer extension ring coaxially and fixedly connected, with the axial end face of the outer extension ring coaxially abutting against the intake air shroud. The intake volute includes a volute positioning cylinder and a spiral air passage housing fixedly connected, with its end face coaxially abutting against the outer extension ring. The toothed ring is clamped between the intake duct outer ring and the intake volute, with its inner and outer peripheral walls respectively conforming to the first and second sealing surfaces. Its radial linear expansion coefficient is greater than the latter two, and it includes a ring body and multiple pressure-reducing toothed rings arranged axially at intervals, forming a stepped pressure-relief cavity between adjacent pressure-reducing toothed rings. This solves the problem of gas leakage easily occurring at the connection of the intake end housing of the auxiliary power system.

Description

Technical Field

[0001] This invention relates to the field of auxiliary power technology, and more specifically, to an auxiliary power system air supply device. Background Technology

[0002] As a critical component of the aircraft's electromechanical system, the auxiliary power system's performance and safety directly affect the stable operation of the entire system. In the auxiliary power system, the air intake consists of multiple interconnected casings that collectively support the rotor system, ensuring its normal rotation. The compressor, as the core component, compresses air through high-speed rotation, creating a high-pressure airflow. This compressed high-pressure air is then transported to the combustion chamber for combustion, producing high-temperature, high-pressure gas that ultimately drives the turbine to perform work. During system operation, the connection and sealing performance of the air intake components directly impacts the overall efficiency and reliability of the system.

[0003] During the operation of the auxiliary power system, a significant pressure difference exists between the high-pressure gas generated by the compressor and the external environment, making gas leakage prone to occur at the housing connection at the intake end. This leakage mainly occurs at the gaps where multiple housings connect, allowing high-pressure gas to escape to the outside through these tiny gaps. The sealing structure at the housing connection cannot effectively cope with the high pressure differential environment, making gas leakage inevitable. This, in turn, affects the overall performance and reliability of the auxiliary power system, causing serious performance losses and safety risks. Summary of the Invention

[0004] To address the problem of gas leakage at the air intake housing connection point of an auxiliary power system, this invention provides an auxiliary power system air supply device, comprising: Air intake casing; An air intake vent, wherein the axial end face of the air intake vent is coaxially abutted against the air intake duct housing; The air intake duct outer ring includes a coaxial and fixedly connected outer sealing cylinder and an outer extension ring; the outer diameter of the outer extension ring is larger than the outer diameter of the outer sealing cylinder; the axial end face of the outer extension ring is coaxially abutted against the air intake vent. An intake volute, comprising a volute positioning cylinder and a spiral air passage shell fixedly connected together; the axial end face of the volute positioning cylinder abuts coaxially with the outer extension ring; A toothed ring is sandwiched between the outer ring of the air intake duct and the air intake volute; the outer peripheral wall of the outer sealing cylinder is a first sealing surface; the inner peripheral wall of the volute positioning cylinder is a second sealing surface; the inner peripheral wall of the toothed ring is in contact with the first sealing surface; the outer peripheral wall of the toothed ring is in contact with the second sealing surface; the radial linear expansion coefficient of the toothed ring is greater than the radial linear expansion coefficients of the outer ring of the air intake duct and the volute positioning cylinder; the toothed ring includes a ring body and a plurality of pressure-reducing toothed rings arranged sequentially at intervals along the axial direction of the ring body; a stepped pressure relief cavity is formed between adjacent pressure-reducing toothed rings; A locking unit that sequentially and securely connects the air intake housing, the air intake flap, the air intake outer ring, and the air intake volute. The rotor is located inside the outer ring of the intake duct; the rotor is coaxial with the outer ring of the intake duct; the rotor delivers high-pressure gas into the intake volute when rotating.

[0005] In some embodiments, the pressure-reducing toothed ring is located on the outer peripheral wall of the ring body.

[0006] In some embodiments, the toothed ring is interference-fitted with the outer sealing cylinder, and the toothed ring is transition-fitted with the intake volute.

[0007] In some embodiments, there is a gap between the toothed ring and the outer extension ring; the inner peripheral wall of the volute positioning cylinder has an annular notch near the end of the outer extension ring.

[0008] In some embodiments, the spacing between two adjacent pressure-reducing gear rings gradually increases along the direction of the high-pressure air chamber near the intake volute.

[0009] In some embodiments, the dimension of the pressure-reducing gear ring along the axial direction of the ring body gradually increases in the direction of the high-pressure air chamber near the intake volute.

[0010] In some embodiments, the toothed ring further includes a positioning extension ring; the positioning extension ring is coaxial with and fixedly connected to the ring body; the axial end face of the positioning extension ring abuts against the outer sealing cylinder; the intake volute further includes a clamping ring; the clamping ring clamps the axial end face of the positioning extension ring away from the outer sealing cylinder.

[0011] In some embodiments, the intake duct housing includes a housing positioning ring and a housing sealing cylinder that are coaxially and fixedly connected; the inner diameter of the housing positioning ring is smaller than the inner diameter of the housing sealing cylinder; the housing positioning ring is coaxially abutted against the intake air duct; the inner peripheral wall of the housing sealing cylinder is a third sealing surface; one outer peripheral wall of the intake volute is a fourth sealing surface; the third sealing surface and the fourth sealing surface partially overlap radially.

[0012] In some embodiments, the auxiliary power system air supply device further includes a shaft unit, the shaft unit including a rotating main shaft and a bearing; the rotating main shaft is coaxial with the air intake housing; the rotating main shaft is rotatably connected to the air intake housing through the bearing; the rotor is coaxial with the main shaft and fixedly connected. The air intake housing also includes a housing positioning cylinder; the housing positioning cylinder is coaxial with and fixedly connected to the housing positioning ring; the outer diameter of the housing positioning cylinder is smaller than the inner diameter of the housing sealing cylinder; The air intake vent is fitted with the outer peripheral wall of the outer casing positioning cylinder; the outer peripheral wall of the outer extension ring is fitted with the third sealing surface.

[0013] In some embodiments, a receiving space is formed between a portion of the outer side wall of the spiral air passage shell and a portion of the outer peripheral wall of the volute positioning cylinder; the receiving space gradually decreases in the direction close to the interior of the spiral air passage shell; and the outer shell sealing cylinder portion is located in the receiving space.

[0014] To address the problem of gas leakage at the intake housing connection point of the auxiliary power system, this invention has the following advantages: By stably clamping the toothed ring between the outer ring of the intake duct and the intake volute, and utilizing the fact that the radial linear expansion coefficient of the toothed ring is greater than that of the outer ring of the intake duct and the positioning cylinder of the volute, a tight seal can be achieved between the inner circumferential wall of the toothed ring and the first sealing surface of the outer sealing cylinder of the outer ring of the intake duct, and between the outer circumferential wall of the toothed ring and the second sealing surface of the positioning cylinder of the intake volute. Combined with multiple pressure-reducing toothed rings arranged axially at intervals on the upper ring of the toothed ring, a stepped pressure relief cavity is formed, causing the high-pressure gas to decrease in a stepped manner. Furthermore, with a higher sealing surface tightness formed after thermal expansion, the pressure drop in each stepped pressure relief cavity is controllable, thereby reducing the risk of high-pressure gas leakage. This invention can improve sealing performance and ultimately solve the problem of high-pressure gas leakage from the intake end through the housing gap to the outside, avoiding the resulting performance loss and safety risks. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of an auxiliary power system air supply device according to one embodiment is shown; Figure 2 It shows Figure 1 Enlarged view of point A of the auxiliary power system air supply device.

[0016] Reference numerals: 10 for intake duct housing; 11 for housing positioning ring; 12 for housing sealing cylinder; 13 for housing positioning cylinder; 20 for intake air duct; 30 for intake duct outer ring; 31 for outer sealing cylinder; 32 for outer extension ring; 40 for intake volute; 41 for volute positioning cylinder; 42 for spiral air duct housing; 43 for clamping ring; 50 for grate ring; 51 for ring body; 52 for pressure reducing gear ring; 53 for positioning extension ring; 60 for locking unit; 70 for rotor; 80 for shaft unit; 81 for rotating main shaft; 82 for bearing. Detailed Implementation

[0017] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0018] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0019] As a critical component of the aircraft's electromechanical system, the auxiliary power system's performance and safety directly impact the stable operation of the entire system. In the auxiliary power system, the intake end consists of multiple interconnected housings that collectively support the rotor 70 system, ensuring its normal rotation. The compressor, as the core component, compresses air at high speed, creating a high-pressure airflow. This compressed high-pressure air is then transported to the combustion chamber for combustion, producing high-temperature, high-pressure gas that ultimately drives the turbine to perform work. During system operation, the connection and sealing performance of the intake end components directly affect the overall efficiency and reliability of the system. During auxiliary power system operation, the significant pressure difference between the high-pressure gas generated by the compressor and the external environment makes gas leakage prone to occur at the housing connections at the intake end. This leakage mainly occurs at the gaps between the interconnected housings, where high-pressure gas escapes to the outside through these tiny gaps. The sealing structure at the housing connections cannot effectively cope with the high-pressure differential environment, making gas leakage inevitable. This, in turn, affects the overall performance and reliability of the auxiliary power system, causing serious performance losses and safety risks.

[0020] In this embodiment, to solve the above-mentioned problems, this application provides an auxiliary power system air supply device. For example... Figure 1 , Figure 2 As shown, the auxiliary power system air supply device includes an intake manifold housing 10, an intake air vent 20, an intake manifold outer ring 30, an intake volute housing 40, a toothed ring 50, a locking unit 60, and a rotor 70.

[0021] The air intake housing 10 serves as the basic load-bearing component of the overall assembly structure, providing an installation foundation for the coaxial assembly of subsequent components and ensuring the assembly stability of the overall structure.

[0022] The axial end face of the air intake shroud 20 abuts coaxially with the air intake housing 10, ensuring the coaxiality of the air intake shroud 20 and the air intake housing 10, avoiding abnormal gas flow path caused by assembly misalignment, and laying a structural foundation for the stable delivery of high-pressure gas. Since the cavity formed by the air intake housing 10 and the air intake shroud 20 does not contain high-pressure gas, they do not need to achieve a sealing effect. Therefore, the three contact points between them are positioning surfaces with certain alignment requirements and require frequent disassembly. Thus, the air intake shroud 20 and the air intake housing 10 adopt a transition fit.

[0023] The intake duct outer ring 30 includes a coaxial and fixedly connected outer sealing cylinder 31 and an outer extension ring 32. The outer diameter of the outer extension ring 32 is larger than the outer diameter of the outer sealing cylinder 31. The axial end face of the outer extension ring 32 abuts coaxially with the intake air vent 20, improving the coaxial accuracy of the overall assembly. At the same time, the outer peripheral wall of the outer sealing cylinder 31 serves as the first sealing surface, providing a fitting basis for the subsequent assembly of the sealing structure.

[0024] The intake volute 40 includes a volute positioning cylinder 41 and a spiral air passage shell 42 that are fixedly connected. The axial end face of the volute positioning cylinder 41 abuts coaxially with the outer extension ring 32 to ensure the assembly accuracy of the sealing structure.

[0025] The toothed ring 50 is clamped between the outer ring 30 of the intake duct and the intake volute 40. The outer peripheral wall of the outer sealing cylinder 31 is the first sealing surface, and the inner peripheral wall of the volute positioning cylinder 41 is the second sealing surface. The inner peripheral wall of the toothed ring 50 is in contact with the first sealing surface, and the outer peripheral wall of the toothed ring 50 is in contact with the second sealing surface. The radial linear expansion coefficient of the toothed ring 50 is greater than that of the outer ring 30 of the intake duct and the volute positioning cylinder 41. Thus, the toothed ring 50 can undergo more significant radial expansion when the temperature changes, thereby tightly fitting the sealing surface and achieving a reliable seal between the outer ring 30 of the intake duct and the intake volute 40. The toothed ring 50 includes a ring body 51 and a plurality of pressure-reducing toothed rings 52 arranged sequentially at intervals along the axial direction of the ring body 51. A stepped pressure relief cavity is formed between adjacent pressure-reducing toothed rings 52. The stepped pressure relief cavity formed by the plurality of pressure-reducing toothed rings 52 causes the high-pressure gas to decrease in stages, reducing the pressure difference on both sides of the sealing surface, thereby reducing the risk of gas leakage.

[0026] The locking unit 60 sequentially and securely connects the intake duct housing 10, the intake air vent 20, the intake duct outer ring 30, and the intake volute 40. The locking unit 60 ensures the coaxiality of the assembled components, improves the overall structural stability, and prevents displacement under high-pressure gas impact, thereby guaranteeing the assembly accuracy and operational reliability of the overall structure and providing structural assurance for sealing performance and gas delivery efficiency. In some embodiments, the locking unit 60 is a bolt.

[0027] The rotor 70 is located inside the outer ring 30 of the intake duct, and is coaxial with the outer ring 30. While rotating, the rotor 70 delivers high-pressure gas into the intake volute 40. The coaxiality of the rotor 70 and the outer ring 30 ensures the coaxial accuracy of gas delivery, avoids eccentric vibration during rotation, and ensures that high-pressure gas can be stably and efficiently delivered into the intake volute 40. This, combined with the sealing structure, achieves low-leakage delivery of high-pressure gas, ensuring stability and high efficiency during the rotational delivery of high-pressure gas.

[0028] Furthermore, the pressure-reducing toothed ring 52 is located on the outer peripheral wall of the ring body 51. This prevents the pressure-reducing toothed ring 52 from colliding with the second sealing surface of the volute positioning cylinder 41 during assembly, thus avoiding damage to the pressure-reducing toothed ring 52. This allows for precise alignment and fit with the inner peripheral wall of the second sealing surface of the volute positioning cylinder 41, ensuring that the formation of the stepped pressure relief cavity matches the flow path of the high-pressure gas at the sealing surface, further optimizing the gradient distribution of the stepped pressure decrease and improving the leak-proof performance of the sealing surface.

[0029] Furthermore, the toothed ring 50 and the outer sealing cylinder 31 are interference-fitted, which eliminates the assembly gap between them, ensures tight connection, and avoids sealing failure due to relative displacement. The toothed ring 50 and the intake volute 40 are transition-fitted. This facilitates positioning and calibration during assembly and provides reasonable deformation space when the toothed ring 50 expands radially due to temperature changes. It also maintains the fit with the second sealing surface. The inner and outer ring surfaces of the toothed ring 50 are respectively set with interference fit and transition fit, which allows most of the thermal expansion of the toothed ring 50 to be squeezed towards the intake volute 40, further improving sealing performance and further reducing the risk of gas leakage.

[0030] In some embodiments, the toothed ring 50 is made of a metal with a large coefficient of linear expansion, such as aluminum alloy, which can ensure accurate positioning. Since the thermal expansion of metal is less than that of rubber, the inner side can be sealed by using an interference fit without taking up thermal expansion.

[0031] Furthermore, there is a gap between the toothed ring 50 and the outer extension ring 32, and the inner peripheral wall of the volute positioning cylinder 41 has an annular notch near the end of the outer extension ring 32. When the toothed ring 50 expands, it can reduce the relative friction between the outer ring 30 of the intake passage and the axial end face of the intake volute 40, thus avoiding interference between the two during assembly or thermal expansion caused by temperature changes, ensuring that each component can deform normally and work stably. At the same time, it also provides space for axial thermal deformation of the toothed ring 50, relieving the thermal stress of the toothed ring 50 and avoiding material damage and structural failure. In addition, the annular notch can provide a buffer space for the initial depressurization of high-pressure gas. Combined with the pressure reduction effect of the stepped depressurization cavity, it optimizes the pressure distribution near the sealing surface, reduces the impact of gas impact on the sealing surface contact state, and improves sealing reliability.

[0032] Furthermore, such as Figure 2 As shown, the spacing between two adjacent pressure-reducing toothed rings 52 gradually increases along the direction of the high-pressure gas chamber closer to the intake volute 40, causing the volume of the stepped pressure relief cavity to expand sequentially along the gas flow direction. This adapts to the flow characteristics of high-pressure gas from the high-pressure area to the low-pressure area, avoiding sudden pressure changes caused by space constraints, and making the gas pressure drop more stable and uniform, further reducing the risk of leakage. At the same time, the gas leakage resistance increases step by step, and the resistance is inversely proportional to the pressure, avoiding damage to the pressure-reducing toothed rings 52 under large resistance and high pressure, and ensuring the stability of the stepped pressure drop.

[0033] Furthermore, such as Figure 2As shown, the dimension of the pressure-reducing toothed ring 52 along the axial direction of the ring body 51 gradually increases in the direction of the high-pressure air chamber near the intake volute 40, which enhances the structural strength of the pressure-reducing toothed ring 52 in the high-pressure area, resists the direct impact of high-pressure gas, and ensures the service life of the pressure-reducing toothed ring 52. At the same time, it optimizes the flow channel cross-section structure of the stepped pressure relief cavity, making the gas flow smoother and the effect of pressure step-down more significant, further improving the sealing and leak-proof performance.

[0034] Furthermore, the toothed ring 50 also includes a positioning extension ring 53. The positioning extension ring 53 is coaxial with and fixedly connected to the ring body 51. The axial end face of the positioning extension ring 53 abuts against the outer sealing cylinder 31, providing a precise axial positioning reference for the toothed ring 50 and ensuring the fitting accuracy of its inner and outer peripheral walls with the first sealing surface and the second sealing surface. The intake volute 40 also includes a clamping ring 43. The clamping ring 43 clamps the axial end face of the positioning extension ring 53 away from the outer sealing cylinder 31, which can firmly lock the toothed ring 50 in the assembly position, preventing the toothed ring 50 from shifting due to high-pressure gas flow or component thermal expansion, ensuring the continuous fitting state of the sealing surface, and further improving the overall sealing effect in combination with the sealing structure characteristics of the toothed ring 50.

[0035] Furthermore, the intake duct housing 10 includes a housing positioning ring 11 and a housing sealing cylinder 12 that are coaxially and fixedly connected. The inner diameter of the housing positioning ring 11 is smaller than the inner diameter of the housing sealing cylinder 12, providing a suitable positioning support structure for the intake air shroud 20 and ensuring the coaxial assembly accuracy between the intake air shroud 20 and the intake duct housing 10. The housing positioning ring 11 and the intake air shroud 20 coaxially abut against each other, further enhancing the coaxiality and connection stability of the overall structure. The inner peripheral wall of the housing sealing cylinder 12 is the third sealing surface, and one outer peripheral wall of the intake volute 40 is the fourth sealing surface. The third sealing surface and the fourth sealing surface overlap radially. When the toothed ring 50 expands, it drives the third sealing surface to compress the fourth sealing surface, forming a double sealing fit structure. Combined with the sealing effect of the toothed ring 50, this increases the resistance of the gas leakage path and improves the sealing performance of the overall device. Since the third sealing surface is far from the second sealing surface, the buffer space formed by the annular notch can become a transitional air pressure space between the second and third sealing surfaces, avoiding a sharp drop in air pressure to 0 after the axial end face between the outer extension ring 32 and the volute positioning cylinder 41 is pressed together, thereby achieving the continuity of the air pressure step-down and improving the sealing effect.

[0036] Furthermore, such as Figure 1As shown, the auxiliary power system air supply device also includes a shaft unit 80, which includes a rotating main shaft 81 and a bearing 82. The rotating main shaft 81 is coaxial with the air intake housing 10 and is rotatably connected via the bearing 82, ensuring smooth and high-speed rotation of the rotating main shaft 81 and providing stable support for the gas delivery operation of the rotor 70. The rotating main shaft 81 is rotatably connected to the air intake housing 10 via the bearing 82, and the rotor 70 is coaxial with and fixedly connected to the main shaft, ensuring the coaxiality of the rotor 70 during rotation and improving the stability and efficiency of high-pressure gas delivery. The air intake housing 10 also includes a housing positioning cylinder 13. The housing positioning cylinder 13 is coaxial with and fixedly connected to the housing positioning ring 11. The outer diameter of the housing positioning cylinder 13 is smaller than the inner diameter of the housing sealing cylinder 12, which provides fitting space for the assembly of the air intake hood 20 and also plays an auxiliary positioning role.

[0037] The intake vent 20 transitions with the outer peripheral wall of the housing positioning cylinder 13. Since both the intake vent 20 and the intake outer ring 30 are positioned in conjunction with the intake housing 10, their positioning effect is not affected by the transmission of the radial dimensional chain. The outer peripheral wall of the outer extension ring 32 transitions with the third sealing surface, further optimizing the assembly accuracy and coaxiality of each component, reducing gas leakage caused by assembly gaps, and enhancing the reliability of the overall structure.

[0038] Furthermore, such as Figure 2 As shown, a receiving space is formed between a portion of the outer wall of the spiral air passage shell 42 and a portion of the outer peripheral wall of the volute positioning cylinder 41. This space can accommodate the assembly requirements of the outer casing sealing cylinder 12, making the overall structure more compact and improving space utilization. The receiving space gradually decreases in size towards the interior of the spiral air passage shell 42. The outer casing sealing cylinder 12 is partially located within this receiving space. The gradually changing inner wall of the receiving space fits with the outer peripheral wall of the outer casing sealing cylinder 12, enhancing the sealing performance between the outer casing sealing cylinder 12 and the intake volute 40. Combined with the overlapping structure of the third and fourth sealing surfaces, the overall sealing and leak-proof performance of the device is further improved.

[0039] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. An auxiliary power system air supply device, characterized in that, The auxiliary power system air supply device includes: Air intake casing; An air intake vent, wherein the axial end face of the air intake vent is coaxially abutted against the air intake duct housing; The air intake duct outer ring includes a coaxial and fixedly connected outer sealing cylinder and an outer extension ring; the outer diameter of the outer extension ring is larger than the outer diameter of the outer sealing cylinder; the axial end face of the outer extension ring is coaxially abutted against the air intake vent. An intake volute, comprising a volute positioning cylinder and a spiral air passage shell fixedly connected together; the axial end face of the volute positioning cylinder abuts coaxially with the outer extension ring; A toothed ring is sandwiched between the outer ring of the air intake duct and the air intake volute; the outer peripheral wall of the outer sealing cylinder is a first sealing surface; the inner peripheral wall of the volute positioning cylinder is a second sealing surface; the inner peripheral wall of the toothed ring is in contact with the first sealing surface; the outer peripheral wall of the toothed ring is in contact with the second sealing surface; the radial linear expansion coefficient of the toothed ring is greater than the radial linear expansion coefficients of the outer ring of the air intake duct and the volute positioning cylinder; the toothed ring includes a ring body and a plurality of pressure-reducing toothed rings arranged sequentially at intervals along the axial direction of the ring body; a stepped pressure relief cavity is formed between adjacent pressure-reducing toothed rings; A locking unit that sequentially and securely connects the air intake housing, the air intake flap, the air intake outer ring, and the air intake volute. The rotor is located inside the outer ring of the intake duct; the rotor is coaxial with the outer ring of the intake duct; the rotor delivers high-pressure gas into the intake volute when rotating; The toothed ring further includes a positioning extension ring; the positioning extension ring is coaxial with and fixedly connected to the ring body; the axial end face of the positioning extension ring abuts against the outer sealing cylinder; the intake volute also includes a clamping ring; the clamping ring clamps the axial end face of the positioning extension ring away from the outer sealing cylinder; The intake duct housing includes a housing positioning ring and a housing sealing cylinder that are coaxially and fixedly connected; the inner diameter of the housing positioning ring is smaller than the inner diameter of the housing sealing cylinder; the housing positioning ring is coaxially abutted against the intake air vent; the inner peripheral wall of the housing sealing cylinder is a third sealing surface; one outer peripheral wall of the intake volute is a fourth sealing surface; the third sealing surface and the fourth sealing surface partially overlap radially.

2. The auxiliary power system air supply device according to claim 1, characterized in that, The pressure-reducing toothed ring is located on the outer peripheral wall of the ring body.

3. The auxiliary power system air supply device according to claim 1, characterized in that, The toothed ring is interference-fitted with the outer sealing cylinder, and the toothed ring is transition-fitted with the intake volute.

4. The auxiliary power system air supply device according to claim 1, characterized in that, There is a gap between the toothed ring and the outer extension ring; the inner peripheral wall of the volute positioning cylinder has an annular notch near the end of the outer extension ring.

5. The auxiliary power system air supply device according to claim 1, characterized in that, The spacing between two adjacent pressure-reducing gear rings gradually increases along the direction of the high-pressure air chamber closer to the intake volute.

6. The auxiliary power system air supply device according to claim 5, characterized in that, The dimension of the pressure-reducing gear ring along the axial direction of the ring body gradually increases in the direction of the high-pressure air chamber closer to the intake volute.

7. The auxiliary power system air supply device according to claim 1, characterized in that, The auxiliary power system air supply device also includes a shaft unit, which includes a rotating main shaft and a bearing; the rotating main shaft is coaxial with the air intake housing; the rotating main shaft is rotatably connected to the air intake housing through the bearing; the rotor is coaxial with the main shaft and fixedly connected. The air intake housing also includes a housing positioning cylinder; the housing positioning cylinder is coaxial with and fixedly connected to the housing positioning ring; the outer diameter of the housing positioning cylinder is smaller than the inner diameter of the housing sealing cylinder; The air intake vent is fitted with the outer peripheral wall of the outer casing positioning cylinder; the outer peripheral wall of the outer extension ring is fitted with the third sealing surface.

8. The auxiliary power system air supply device according to claim 1, characterized in that, A receiving space is formed between a portion of the outer side wall of the spiral air passage shell and a portion of the outer peripheral wall of the volute positioning cylinder; the receiving space gradually decreases in size along the direction closer to the interior of the spiral air passage shell; the outer shell sealing cylinder portion is located within the receiving space.

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