A radial air foil bearing mounting structure for an airborne electric compressor

Abstract

This invention belongs to the technical field of airborne electric compressors, and relates to a radial air foil bearing mounting structure for airborne electric compressors. It includes a motor housing, vibration-damping rubber rings, bearing sleeves, steel sleeves, sealing rings, metal gaskets, anti-loosening washers, elastic retaining rings, retaining pins, air intake nozzles, shafts, motor stators, motor rotors, impellers, interference pins, fastening screws, and anti-loosening washers. The grooves on the steel sleeve have an inverted trumpet-shaped structure, smaller on the outside and larger on the inside, ensuring free movement and rotation of the overlapping foils during operation to accommodate rotor misalignment. Simultaneously, the sealing ring between the steel sleeve and the bearing sleeve can be used for vibration damping in the airborne environment and to reduce misalignment installation errors between the front and rear radial bearings and the rotor, reducing the coaxiality requirements between components. The sealing ring is used for sealing the radial air bearings, and the actual clearance between the sealing ring and the rotor can be flexibly selected according to the cooling flow rate and the internal pressure requirements of the bearing.

Description

Technical Field

[0001] This invention belongs to the field of airborne electric compressor technology, and relates to a radial air foil bearing mounting structure for an airborne electric compressor. Background Technology

[0002] Electric compressors are a core component of future electric environmental control systems for civil aircraft. As a high-pressure air source, they can be combined with radiators, pressure regulators, and other components to form a new type of electric environmental control system. Compared to traditional turbine refrigeration, electric environmental control does not require bleed air from the engine, reducing engine compensation losses and eliminating complex pneumatic piping, which is beneficial for reducing aircraft size and weight and improving reliability.

[0003] Due to stringent requirements on size and weight, airborne electric compressors, particularly those supported by traditional rolling bearings, are unsuitable for future aviation applications due to their complex structure, reliance on regular maintenance, short lifespan, low reliability, and susceptibility to oil contamination of the air source. The air-bearing electric compressor described in this invention utilizes dynamic air bearings, offering advantages such as maintenance-free operation, high limiting speed, zero pollution, and high reliability. It is particularly suitable for airborne environments, facilitating the achievement of compact and efficient environmental control systems.

[0004] For airborne electric compressors, air bearings are core components, and the mounting structure of radial air bearings plays a crucial role in the compressor. Traditional mounting structures have many shortcomings:

[0005] 1. The interface for installing foil is generally a parallel groove. The foil of the air bearing has no free movement space at the bending point, which makes the bearing unable to adapt to the depth and affects the load-bearing performance.

[0006] 2. The bearing sleeve is directly fixed to the motor housing with screws, which is a rigid connection without vibration damping measures. The air bearing vibration is directly transmitted to the air bearing foil. Under large vibration impact, the rotor is prone to rubbing against each other, and the relatively soft elastic foil is directly deformed by the impact.

[0007] 3. The bearing sleeve is generally designed with a stop at one end and a sealing baffle at the other end to stop the foil. On the one hand, the bearing sleeve is difficult to process, and on the other hand, the screws need to be sealed with a fuse after each installation to prevent loosening, which makes disassembly and assembly troublesome.

[0008] 4. The sealing baffle is generally made of polyimide material and also has a toothed sealing function. Over a long period of time, it stops the foil. The high-frequency vibration impact in the axial direction will cause gaps in the sealing baffle, and the foil cross-movement will increase until the air bearing fails.

[0009] 5. To meet the rigidity requirements, the steel bearing sleeve is directly fixed to the motor housing. The increase in size and weight brought about by the large-sized bearing sleeve contradicts the requirements of the airborne environmental control system to be compact and efficient.

[0010] 6. During the product's lifting process, there is sliding friction contact between the shaft and the bearing foil. During long-term start-stop operations, this torque is repeatedly transmitted to the bearing sleeve screw, which may cause the screw to break.

[0011] 7. The positioning circle of the bearing sleeve on the housing differs significantly from the inner diameter of the bearing sleeve, and the coaxiality of the inner hole of the mounting foil and the housing cannot be strictly guaranteed.

[0012] 8. Radial bearings are cooled by air at a single angle, which cannot achieve uniform and sufficient cooling in the circumferential direction. Furthermore, the cooling of the bearings and the cooling of the motor are isolated, resulting in reduced cooling efficiency and volute outlet flow rate.

[0013] 9. The bearing is cooled by direct unidirectional induced draft air cooling. When the induced draft air contains foreign particles, it can easily cause the air bearing to jam. Summary of the Invention

[0014] Purpose of the invention

[0015] An air bearing mounting structure for an airborne electric compressor is provided. This invention features high vibration and shock resistance, strong adaptability, easy disassembly, high reliability, and space saving.

[0016] Technical solution

[0017] An air bearing mounting structure for an airborne electric compressor includes a motor housing, a vibration-damping rubber ring, a bearing sleeve, a steel sleeve, a sealing ring, a metal gasket, an anti-loosening washer, an elastic retaining ring, a retaining pin, an air intake nozzle, a shaft, a motor stator, a motor rotor, an impeller, an interference pin, fastening screws, and an anti-loosening washer. The steel sleeve is mounted on the bearing sleeve near the turbine side and is limited by a retaining pin to prevent rotation. Two circumferential grooves are formed on the inner wall of the bearing sleeve for housing the vibration-damping rubber ring. The bearing sleeve and the steel sleeve form a cooling channel through the sealing area created by the two vibration-damping rubber rings, providing cooling for the bearing. The cooling channel communicates with an air inlet on the bearing sleeve. An air outlet is provided on the wall of the steel sleeve, through which gas is discharged to cool the bearing. A sealing ring is provided at the end of the steel sleeve near the turbine and is mounted on the bearing sleeve by an interference pin. A metal gasket is placed between the steel sleeve and the sealing ring to prevent the sealing ring from being scratched by the bearing.

[0018] The bearing sleeve is provided with another sealing ring on the side near the motor. The sealing ring is fitted onto the groove of the bearing sleeve by an elastic retainer. Another metal gasket is provided between the steel sleeve and the sealing ring. The bearing sleeve is provided with ventilation holes in the circumference. The gas generated by the impeller rotation provides cooling gas to the motor through the ventilation holes.

[0019] During assembly, the bearing sleeve is installed on the motor housing using fastening screws and anti-loosening washers, with an anti-loosening washer in the middle. The shaft is installed in the air bearing inside the steel sleeve.

[0020] Furthermore, it also includes an air vent, which is disposed at the inlet of the inlet channel of the bearing sleeve.

[0021] Furthermore, the head of the air intake nozzle faces the opposite direction of the impeller rotation, thereby filtering impurities in the cooling airflow through the reverse air intake nozzle.

[0022] Furthermore, the slot on the steel sleeve for installing the bearing foil is inverted trumpet shape, and the slot is provided with a flat foil. By adding a shim to the slot, the angle of the flat foil can be adjusted, thereby adjusting the preload of the bearing and the rotor.

[0023] Furthermore, the inner ring of the sealing ring is equipped with serrations to achieve dynamic pressure sealing of the bearing and prevent large particles of foreign matter from entering the bearing.

[0024] Furthermore, the bearing sleeve, steel sleeve, and metal gasket are machined with grooves on one side, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation of the grooves and the retaining pins.

[0025] Furthermore, the motor housing and bearing sleeve are made of 7A04 stainless steel.

[0026] Furthermore, the steel sleeve is made of 0Cr17Ni7.

[0027] Furthermore, the sealing ring material is polyimide.

[0028] Furthermore, the gasket material is GH4169.

[0029] Furthermore, the elastic retaining ring material is 3J68.

[0030] The beneficial effects of this application are as follows:

[0031] The slots on the steel sleeve have an inverted trumpet-shaped structure, smaller on the outside and larger on the inside, ensuring that the overlapping foils can move and rotate freely during operation to accommodate rotor misalignment. Simultaneously, the sealing ring between the steel sleeve and the bearing sleeve can be used for vibration reduction in the airborne environment and to reduce misalignment installation errors between the front and rear radial bearings and the rotor, lowering the coaxiality requirements between components. The sealing ring is used to seal the radial air bearings, and the actual clearance between the sealing ring and the rotor can be flexibly selected according to the cooling flow rate and the internal pressure requirements of the bearing. The axial fixation of the steel sleeve is achieved by pins or elastic retaining rings, with pinholes at the retaining ring notches to allow for flexible removal of the foils. The bearing sleeve is made of aluminum, the steel sleeve is made of steel and is relatively small in size, and the rest of the housing is also made of aluminum, achieving the goal of reducing the weight of the air compressor and increasing the local support rigidity. The bleed air nozzle head faces the opposite direction of impeller rotation, and the bearing cooling uses reverse bleed air, which can effectively reduce the possibility of large foreign particles entering the air bearing, reduce the risk of rotor jamming, improve the operational reliability of the air compressor and the margin of the operating environment, while the gas generated by the impeller rotation can also provide cooling for the motor through the ventilation holes of the bearing sleeve. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is a schematic diagram of the structure of the bearing sleeve of the present invention and its installation on the motor housing;

[0034] Figure 3 is a schematic diagram of the installation of the steel sleeve and radial air bearing of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation of the steel sleeve in the bearing sleeve according to the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the toothed sealing ring of the present invention;

[0037] Figure 6 is a schematic diagram of the structure of the single-layer and multi-layer elastic retaining rings of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure and installation of the reverse air vent of the present invention;

[0039] Figure 8 This is a schematic diagram showing the direction of the cooling airflow for the bearings and motor of the present invention;

[0040] Figure 9 Overall installation structure diagram of the present invention

[0041] Reference numerals: 1-Motor housing, 2-Bearing sleeve, 3-Vibration damping rubber ring, 4-Steel sleeve, 5-Grate seal ring, 6-Metal gasket, 7-Anti-loosening washer, 8-Elastic retaining ring, 9-Stop pin, 10-Air vent, 11-Shaft, 12-Motor stator, 13-Motor rotor, 14-Impeller, 15-Interference fitting pin, 16-Fasting screw, 17-Anti-loosening washer, 21-Cooling channel, 22-Groove, 23-Ventilation hole, 41-Slot, 42-Air outlet. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below. In the examples, the same or similar reference numerals denote the same or similar components or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this invention. The embodiments described below with reference to reference are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below.

[0043] 1. In the aforementioned airborne electric compressor air bearing installation structure, the steel sleeve has a specially structured slot for installing radial bearing foils. The slot is in the shape of an inverted trumpet, with the outer part being smaller and the inner part being larger.

[0044] 2. In the aforementioned air bearing installation structure for an airborne electric compressor, the bearing sleeve is installed inside the motor housing by screws and anti-loosening washers, and the steel sleeve is installed inside the bearing sleeve by clearance fit. There are vibration damping sealing rings between the steel sleeve and the bearing sleeve, and the number of sealing rings is 2.

[0045] 3. In the aforementioned airborne electric compressor air bearing installation structure, the two ends of the steel sleeve rely on sealing rings and metal gaskets for radial air bearing sealing and to prevent axial movement of the foil. The inner ring of the sealing ring is arranged with grates to achieve dynamic pressure sealing of the bearing and to prevent large particles of foreign matter from entering the bearing.

[0046] 4. In the aforementioned air bearing installation structure for an airborne electric compressor, a groove is machined on one side of the bearing sleeve, steel sleeve, and metal gasket. The groove and the retaining pin work together to prevent the steel sleeve from rotating in the circumferential direction.

[0047] 5. In the aforementioned airborne electric compressor air bearing installation structure, the replacement function of the sealing ring and foil is achieved by using interference pins or elastic retaining rings installed inside the bearing sleeve.

[0048] 6. In the aforementioned air bearing mounting structure for an airborne electric compressor, the head of the air intake nozzle faces the opposite direction to the impeller rotation direction, thereby filtering impurities in the cooling airflow through the reverse air intake nozzle.

[0049] 7. In the aforementioned airborne electric compressor air bearing installation structure, there is a high-pressure chamber between the bearing sleeve and the steel sleeve, which, together with the evenly distributed air inlets on the steel sleeve, achieves 360-degree full-circumference cooling of the bearing.

[0050] 8. In the aforementioned air bearing mounting structure for an airborne electric compressor, the outer ring of the bearing sleeve has evenly distributed air holes for introducing high-pressure gas from the back of the impeller into the motor stator for heat dissipation.

[0051] Example 1

[0052] An air bearing mounting structure for an airborne electric compressor, see [reference]. Figures 1 to 8 This includes motor housing, vibration damping rubber rings, bearing sleeves, steel sleeves, sealing rings, metal gaskets, sealing gaskets, elastic retaining rings, retaining pins, interference pins, reverse air vents, fastening screws, anti-loosening washers, etc.

[0053] In the above structure, the bearing sleeve is fixed to the motor housing by screws and anti-loosening washers. The number of fastening screws and anti-loosening washers is determined according to the usage.

[0054] In the above structure, the bearing sleeve and the steel sleeve are clearance fit, and there are two rubber rings between them for vibration damping.

[0055] The aforementioned steel sleeve has six grooves 41 evenly machined along the circumference for inserting air bearing foils. The groove openings are in the shape of an "inverted trumpet" with a "smaller outer diameter and larger inner diameter" to prevent the foils from falling out and to allow the overlapping foils to rotate freely to accommodate rotor skew.

[0056] The aforementioned bearing sleeve has a metal gasket, a toothed sealing ring, and an elastic retaining ring installed sequentially along the axial direction at one end to achieve axial fixation and constraint on one side of the air bearing foil.

[0057] The other end of the aforementioned bearing sleeve is sequentially fitted with a metal gasket, a toothed sealing ring, and an interference pin along the axial direction to achieve axial fixation and constraint on the other side of the air bearing foil.

[0058] The aforementioned elastic retaining ring is a single-layer type with a notch, and two round holes are arranged near the opening of the retaining ring for easy removal.

[0059] The aforementioned bearing sleeve is interference-fitted with a reverse air vent. The head of the air vent faces the opposite direction of the impeller rotation to achieve reverse air venting and prevent impurities from entering the bearing.

[0060] The aforementioned bearing sleeve has a cooling channel 21 machined in the middle, forming a cavity between it and the steel sleeve. The cooling airflow first passes through this cavity, and then flows through the evenly distributed air outlets 42 on the steel sleeve to the bearing foil for cooling.

[0061] The aforementioned bearing sleeve, sealing gasket, and steel sleeve are machined with U-shaped grooves at the same angle, which, together with the stop pin 9, achieve fixed constraint along the circumferential direction of the air bearing.

[0062] The aforementioned bearing sleeve outer ring is also machined with a ring of evenly distributed ventilation holes 23, which are used to guide the high-pressure gas on the back of the impeller to the motor stator for cooling.

[0063] The aforementioned motor housing and bearing sleeve are made of 7A04, the steel sleeve is made of 0Cr17Ni7, the toothed sealing ring is made of polyimide, the gasket is made of GH4169 (0.15mm thick), and the elastic retaining ring is made of 3J68 (1mm thick).

[0064] Example 2

[0065] In some embodiments, an air bearing mounting structure for an airborne electric compressor, compared to Embodiment 1, is characterized as follows:

[0066] The bearing sleeve and the steel sleeve are clearance fit, and a rubber ring for vibration damping is installed between them, with more than 2 rubber rings.

[0067] The steel sleeve is uniformly machined with 5 to 10 grooves 41 along the circumference to fix the air bearing foil.

[0068] Metal gaskets, toothed sealing rings, and elastic retaining rings are sequentially installed along the axial direction at both ends of the bearing sleeve to achieve axial fixation and constraint on both sides of the air bearing foil.

[0069] The elastic retaining ring is multi-layered with notches, and a round hole is arranged near the opening of the retaining ring for easy removal.

[0070] The bearing sleeve is welded and assembled with a reverse air vent, the head of which faces the same direction as the airflow to achieve reverse air venting.

[0071] The aforementioned bearing sleeve, sealing gasket, and steel sleeve are machined with no fewer than two U-shaped grooves along the same angle, which, together with the same number of retaining pins 9, achieve circumferential fixation of the bearing.

[0072] The aforementioned motor housing and bearing sleeve are made of 2A12, the steel sleeve is made of titanium alloy or high-temperature alloy steel, the gasket is made of GH4145 or Inconcel X-750 or Inconcel X-718 (0.15mm thick), and the elastic retaining ring is made of 65Mn (1mm thick).

[0073] Example 2

[0074] An air bearing mounting structure for an airborne electric compressor includes a motor housing 1, a vibration damping rubber ring 3, a bearing sleeve 2, a steel sleeve 4, a sealing ring 5, a metal gasket 6, an anti-loosening washer 7, an elastic retaining ring 8, a retaining pin 9, an air vent 10, a shaft 11, a motor stator 12, a motor rotor 13, an impeller 14, an interference pin 15, a fastening screw 16, and an anti-loosening washer 17. The steel sleeve 4 is installed on the bearing sleeve 2 near the turbine side and is limited by a retaining pin 9 to prevent rotation. The inner wall of the bearing sleeve 2 has two circumferential grooves 22 for setting vibration damping rubber rings 3. The bearing sleeve 2 and the steel sleeve 4 form a cooling channel 21 through the sealing area formed by the two vibration damping rubber rings 3. The cooling channel 21 provides cooling for the bearing. The cooling channel is connected to the air inlet on the bearing sleeve 2. The steel sleeve 4 has an air outlet 42 on its wall surface. Gas is discharged from the air outlet and provides cooling for the bearing. The end of the steel sleeve 4 near the turbine is provided with a sealing ring 5, which is installed on the bearing sleeve 2 by an interference pin 15. A metal gasket 6 is placed between the steel sleeve 4 and the sealing ring 5 to prevent the sealing ring 5 from being scratched by the bearing.

[0075] The bearing sleeve 2 is provided with another sealing ring 5 on the side near the motor. The sealing ring 5 is fitted onto the groove 24 of the bearing sleeve 2 by an elastic retainer 8. Another metal gasket 6 is provided between the steel sleeve 4 and the sealing ring 5. The bearing sleeve 2 is provided with ventilation holes 23 in the circumferential direction. The gas generated by the rotation of the impeller 14 provides cooling gas to the motor through the ventilation holes 23.

[0076] During assembly, the bearing sleeve 2 is installed on the motor housing 1 by fastening screws 16 and anti-loosening washers 17, with an anti-loosening washer 7 in the middle, and the shaft 11 is installed in the air bearing inside the steel sleeve 4.

[0077] In one embodiment of the present invention, an air vent 10 is also included, which is disposed at the inlet of the inlet channel of the bearing sleeve 2.

[0078] In one embodiment of the present invention, the head of the air vent 10 is oriented in the opposite direction to the impeller rotation direction, and the filtration of impurities in the cooling airflow is achieved by the reverse air vent.

[0079] In one embodiment of the present invention, the slot 41 on the steel sleeve 4 for installing the bearing foil is inverted trumpet shape. The slot 41 is provided with flat foil. By adding a shim to the slot 41, the angle of the flat foil can be adjusted, thereby adjusting the preload of the bearing and the rotor.

[0080] In one embodiment of the present invention, the inner ring of the sealing ring 5 is provided with serrations to achieve dynamic pressure sealing of the bearing and prevent large foreign particles from entering the bearing.

[0081] In one embodiment of the present invention, a groove is machined on one side of the bearing sleeve 2, the steel sleeve 4 and the metal gasket 6, and the steel sleeve is prevented from rotating in the circumferential direction by the cooperation of the groove and the stop pin 9.

[0082] In one embodiment of the present invention, the motor housing 1 and the bearing sleeve 2 are made of 7A04 stainless steel.

[0083] In one embodiment of the present invention, the steel sleeve 4 is made of 0Cr17Ni7.

[0084] In one embodiment of the present invention, the sealing ring 5 is made of polyimide.

[0085] In one embodiment of the present invention, the gasket material is GH4169.

[0086] In one embodiment of the present invention, the elastic retaining ring 8 is made of 3J68 material.

[0087] Working principle: When the rotor and impeller are rotating at high speed, the cooling gas enters the air inlet of the bearing sleeve 2 through the reverse air vent 10, then enters the cooling channel 21, and then enters the air outlet 42 of the steel sleeve 4 to cool the bearing. The sealing ring 5 is assembled with the rotor with a small clearance fit, and the cooled gas flows out through the gap. At the same time, the high pressure gas on the back of the impeller cools the motor through the ventilation hole 23 on the bearing sleeve 2.

[0088] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein. The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Within the spirit and principles of the present invention, any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments applicable to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. An air bearing mounting structure for an airborne electric compressor, characterized in that, The system includes a motor housing, vibration-damping rubber rings, a bearing sleeve, a steel sleeve, a sealing ring, a metal gasket, an anti-loosening washer, an elastic retaining ring, a stop pin, an air vent, a shaft, a motor stator, a motor rotor, an impeller, an interference pin, fastening screws, and anti-loosening washers. The steel sleeve is installed on the bearing sleeve near the turbine side and is limited by a stop pin to prevent rotation. The inner wall of the bearing sleeve has two circumferential grooves for mounting the vibration-damping rubber rings. The bearing sleeve and the steel sleeve form a cooling channel through the sealing area created by the two vibration-damping rubber rings, which provides cooling for the bearing. The cooling channel is connected to the air inlet on the bearing sleeve. The steel sleeve wall has an air outlet, from which gas is discharged to provide cooling for the bearing. A sealing ring is located at the end of the steel sleeve near the turbine and is mounted on the bearing sleeve by an interference pin. A metal gasket is placed between the steel sleeve and the sealing ring to prevent the sealing ring from being scratched by the bearing. The bearing sleeve has another sealing ring on the side near the motor. The sealing ring is fitted onto the groove of the bearing sleeve by an elastic retainer. Another metal gasket is placed between the steel sleeve and the sealing ring. The bearing sleeve has ventilation holes in its circumference. The gas generated by the impeller rotation provides cooling gas to the motor through the ventilation holes. During assembly, the bearing sleeve is installed on the motor housing by fastening screws and anti-loosening washers. An anti-loosening washer is provided in the middle. The shaft is installed in the air bearing inside the steel sleeve.

2. The structure as described in claim 1, characterized in that, It also includes an air vent, which is located at the inlet of the inlet channel of the bearing sleeve.

3. The structure as described in claim 2, characterized in that, The head of the air intake nozzle faces the opposite direction of the impeller rotation, and the impeller uses a reverse air intake nozzle to filter impurities in the cooling airflow.

4. The structure as described in claim 3, characterized in that, The slot on the steel sleeve for installing bearing foil is inverted trumpet shape. The slot is provided with flat foil. By adding a shim to the slot, the angle of the flat foil can be adjusted, thereby adjusting the preload of the bearing and the rotor.

5. The structure as described in claim 4, characterized in that, The inner ring of the sealing ring is equipped with serrations to achieve dynamic pressure sealing of the bearing and prevent large foreign particles from entering the bearing.

6. The structure as described in claim 5, characterized in that, The bearing sleeve, steel sleeve, and metal gasket have grooves machined on one side. The grooves and retaining pins work together to prevent the steel sleeve from rotating in the circumferential direction.

7. The structure as described in claim 6, characterized in that, The motor housing and bearing sleeve are made of 7A04 stainless steel.

8. The structure as described in claim 7, characterized in that, The steel sleeve is made of 0Cr17Ni7.

9. The structure as described in claim 8, characterized in that, The sealing ring material is polyimide.

10. The structure as described in claim 9, characterized in that, The gasket material is GH4169, and the elastic retainer material is 3J68.

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