A high-speed shafting system with air-assisted sealing that does not require an external air source

Abstract

The present invention belongs to the field of mechanical transmission and sealing, and specifically relates to a high-speed shaft system with air-assisted sealing that does not require an external air source. In order to solve the problem that the existing solution processes complex air ducts on the high-speed rotor shaft, on the one hand, it increases the difficulty of machining the rotor, and on the other hand, it affects the torsional strength of the shaft and easily causes rotor imbalance, the present solution provides a cavity in the middle of the static structure component, and two air ducts are symmetrically fixed in the cavity front and back. The air duct of each air duct is also connected to the outside of the static structure component, and the front and rear ends of the high-speed rotor component are connected to the static structure component, and the stirring end of the high-speed rotor component is located between the two air ducts. The present invention does not require modification of the mature sealing structure, nor does it require special design and processing of the rotor; it does not require the introduction of an external air source to assist sealing, and can adapt to forward and reverse operating conditions. Compared with conventional air-induced non-contact sealing, the use cost of the equipment is reduced and the sealing effect is improved.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical transmission and sealing, and specifically relates to a high-speed shaft system with air-assisted sealing that does not require an external air source. The principle of the air-assisted sealing can be applied to the sealing design of high-speed shaft systems such as gear shafts and rotating main shafts. Background Art

[0002] In order to achieve excellent rotor dynamic characteristics when designing a high-speed shaft system, it is often necessary to place the center of gravity of the shaft head external mount as close to the support bearing as possible. In this way, the support bearing and rotor shaft combination can have higher stiffness characteristics, thereby obtaining a higher critical speed and operating stability. However, placing the bearing as close to the center of gravity of the shaft head external mount means that the bearing seal is closer to structures such as the rotor shaft head flange, compressing the seal design space, and structures such as the connecting bolts at the shaft head flange will cause a wind stirring effect, further causing a pressure difference on both sides of the high-speed seal, which increases the design difficulty of the high-speed seal.

[0003] At present, common high-speed seals include contact seals and non-contact seals. Contact seals can achieve better sealing effects and have advantages such as low leakage. However, due to the contact sealing form, friction and heat will occur, affecting the reliability of the rotor shaft operation. In addition, contact seals are life-long parts, and their sealing limit linear speed is limited by the sealing material. The current maximum application speed limit is about 50m / s. At the same time, the operating temperature is also limited by the sealing material, and its application in low and high temperature environments is limited. Non-contact seals have almost no restrictions on their operating temperature and sealing life due to their non-contact sealing principle. Generally, non-contact seals with strict leakage requirements often require the introduction of air film or liquid film to achieve better sealing effects, and require the addition of auxiliary air supply equipment, which increases the cost of use and reduces equipment maintainability.

[0004] High-speed shafting with conventional non-contact sealing design can meet the sealing requirements at relatively low speeds, but as the linear speed of the rotor seal increases, structures such as the connecting bolts at the shaft head flange will cause the wind stirring effect to increase, and the pressure difference on both sides of the high-speed seal will increase the sealing difficulty. For example, in aircraft engines, in order to improve the sealing of each bearing cavity, it is often necessary to equip an air system to bleed air to the bearing cavity seal; in addition, there are non-contact sealing structures such as spiral seals, which generate airflow through the sealing structure itself to improve the sealing effect, but spiral seals cannot adapt to bidirectional rotation; Chinese patent No. CN114198485B, published on July 9, 2024, "A high-speed shafting with centrifugal auxiliary sealing", sets an air channel on the shaft, and assists the oil return at the seal through the pressure difference caused by the operation of the rotor itself. Compared with conventional air-bleeding non-contact seals, it reduces the use cost of the equipment and improves the sealing effect, but processing complex channels on the high-speed rotor shaft, on the one hand, increases the processing difficulty of the rotor, and on the other hand, affects the torsional strength of the shaft and easily causes rotor imbalance. Therefore, it is necessary to optimize the design on this basis and develop a high-speed shaft system with simple processing and design processability and air-assisted sealing that does not require an external air source. Summary of the Invention

[0005] The purpose of the patent of this invention: The present invention is to solve the problem of existing solutions for processing complex channels on the high-speed rotor shaft, which on the one hand increases the difficulty of machining the rotor, and on the other hand affects the torsional strength of the shaft and easily causes the rotor to be unbalanced. The present invention provides a high-speed shaft system with air-assisted sealing that does not require an external air source.

[0006] The object of the present invention is achieved as follows: a high-speed shafting system with air-assisted sealing that does not require an external air source, comprising a stationary structural assembly, a high-speed rotor assembly, and two induced draft ducts;

[0007] A cavity is provided in the middle of the stationary structure assembly, and two air ducts are fixed symmetrically in the cavity front and back. Channel one of each air duct is also connected to the outside of the stationary structure assembly. The front and rear ends of the high-speed rotor assembly are connected to the stationary structure assembly, and the stirring end of the high-speed rotor assembly is located between the two air ducts.

[0008] Furthermore, the high-speed rotor assembly includes a gear shaft, a rear fulcrum bearing locking nut assembly, a shaft head flange, a shaft head flange locking nut and two sets of bearing structures;

[0009] A gear is installed in the middle of the gear shaft, and a plurality of stirring ends are provided on the gear spokes. The stirring ends are convex structures or concave structures provided on the gear spokes, and the stirring ends face the outlet of the induced air duct.

[0010] The front end of the gear shaft passes through a set of bearing assemblies and the shaft head flange in sequence and is fixed with the shaft head flange locking nut. The rear end of the gear shaft passes through another set of bearing assemblies and is fixed with the rear fulcrum bearing locking nut. The two sets of bearing assemblies are used to support the gear shaft to rotate along the two sets of bearing assemblies.

[0011] Furthermore, the bearing structure includes a bearing inner ring spacer and two main shaft bearings;

[0012] The bearing inner ring spacer and the two main shaft bearings are all sleeved on the gear shaft, and the bearing inner ring spacer is located between the two main shaft bearings.

[0013] Furthermore, the stationary structural assembly includes a gearbox, a rear pivot bearing bushing, a rear pivot bearing outer ring pressure ring, a blind cover, a front pivot bearing bushing, a front pivot bearing outer ring pressure ring and a non-contact sealing ring;

[0014] The front pivot bearing bushing is fixed to the front end of the gearbox, and the front pivot bearing bushing is sleeved on the outside of the front bearing structure. The front pivot bearing outer ring pressure ring is arranged in the front pivot bearing bushing and is located in front of the bearing structure. The non-contact sealing ring is located in front of the front pivot bearing bushing and is tightly attached to the front pivot bearing bushing. The rear end convex ring of the non-contact sealing ring presses against the front pivot bearing outer ring pressure ring and is inserted into the front pivot bearing bushing. An axial gap and a radial gap are left between the non-contact sealing ring and the shaft head flange.

[0015] A channel 2 is provided on the upper portion of the front pivot bearing bushing and is connected to the adjacent channel 1. A channel 3 is provided on the non-contact sealing ring and is connected to the channel 2. The outlet end of the channel 3 faces the radial gap between the non-contact sealing ring and the shaft head flange.

[0016] The rear fulcrum bearing bushing and the blind cover are fixed to the rear end of the gearbox in sequence from front to back. The rear fulcrum bearing bushing is sleeved on the outside of the bearing structure at the rear end. The rear fulcrum bearing outer ring pressure ring is arranged in the rear fulcrum bearing bushing and is located behind the bearing structure. The front end convex ring of the blind cover presses against the rear fulcrum bearing outer ring pressure ring and is inserted into the rear fulcrum bearing bushing.

[0017] A channel six communicating with an adjacent channel one is provided on the upper portion of the rear fulcrum bearing bushing, and a channel seven communicating with the channel six and the outside is provided on the blind cover.

[0018] Furthermore, the non-contact sealing ring is provided with a channel four connecting the channel three with the outside world;

[0019] The non-contact sealing ring is provided with a channel five communicating with the channel three and the outside, and the channel five is connected with a plug.

[0020] Furthermore, a bearing outer ring oil spray spacer is provided between the two main shaft bearings of each bearing structure, an oil groove is left on the outer ring of the bearing outer ring oil spray spacer, and an oil port 1 provided on the front fulcrum bearing bushing is provided at the bottom of the second channel. The second channel is connected to the oil port 1, and the oil port 1 is located above the oil groove of the adjacent bearing outer ring oil spray spacer;

[0021] The bottom of channel six is ​​provided with oil port two which is arranged on the rear fulcrum bearing bushing. Channel six is ​​connected with oil port two, and oil port two is located above the oil groove of the oil spray spacer ring of the adjacent bearing outer ring.

[0022] Furthermore, a notch 1 is provided at the front lower portion of the front fulcrum bearing outer ring pressure ring, and a channel 8 is provided at the lower portion of the front fulcrum bearing bushing to connect the notch 1 with the internal space of the gear box;

[0023] A notch 2 is provided at the rear lower portion of the rear fulcrum bearing outer ring pressure ring, and a channel 9 is provided at the lower portion of the rear fulcrum bearing bushing for connecting the notch 2 with the internal space of the gear box.

[0024] Furthermore, a channel ten communicating with the channel nine is provided on the non-contact sealing ring, and an outlet end of the channel ten faces the radial gap between the non-contact sealing ring and the shaft head flange.

[0025] Furthermore, an oil flinger is provided between the shaft head flange and the adjacent bearing assembly, which rotates synchronously with the gear shaft. The oil flinger is located inside the outer ring pressure ring of the front fulcrum bearing. An oil port three is provided on the upper part of the outer ring pressure ring of the front fulcrum bearing, and an oil port four corresponding to the oil port three and connected to the channel two is provided on the front fulcrum bearing bushing.

[0026] Furthermore, n oil return sieve holes with a diameter of D are provided at the lower part of the induced draft pipe, and the oil return sieve holes allow the droplets generated by the collected oil-gas mixture to flow back into the gear box.

[0027] Beneficial effects:

[0028] No air from an independent power source is introduced to assist in contactless sealing, and no additional non-contact sealing parts are designed. Special design and processing of the shafting rotor is not required. The centrifugal agitation effect of the raised or recessed structures on the gear spokes on the rotor shaft is utilized, and the vents are designed in combination with the Bernoulli principle. Through a simple and reliable auxiliary sealing structure, the oil return flow in the oil slinger and oil injection ring cavities of the high-speed shafting is improved. The present invention does not require modification of established sealing structures, nor does it require special design and processing of the rotor. It utilizes its own rotating parts to generate negative pressure, eliminating the need for an external air source to assist in sealing, and can adapt to forward and reverse operating conditions. Compared with conventional air-inducing non-contact seals, this reduces the cost of equipment and improves the sealing effect. This is a high-speed shafting system with simple processing and design features and air-assisted sealing that does not require an external air source. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a high-speed shaft system with air-assisted sealing that does not require an external air source. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of a high-speed shaft system with air-assisted sealing that does not require an external air source. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of a high-speed shaft system with air-assisted sealing that does not require an external air source. Figure 3 ;

[0032] Figure 4 is a schematic diagram of an air duct of the present invention;

[0033] Figure 5 yes Figure 4 A partial enlarged schematic diagram. DETAILED DESCRIPTION

[0034] Specific embodiment 1: A high-speed shafting system with air-assisted sealing that does not require an external air source, comprising a stationary structure assembly 10, a high-speed rotor assembly 20, and two air ducts 30;

[0035] A cavity is provided in the middle of the stationary structure component 10, and two air ducts 30 are fixed symmetrically in the cavity front and back. The channel 1 30-1 of each air duct 30 is also connected to the outside of the stationary structure component 10. The front and rear ends of the high-speed rotor component 20 are connected to the stationary structure component 10, and the air stirring end of the high-speed rotor component 20 is located between the two air ducts 30.

[0036] In this embodiment: the end of channel one is close to the stirring end of the high-speed rotor assembly. The stirring end has a high linear velocity and has a strong stirring centrifugal effect on the nearby air, thereby forming a negative pressure zone in zone IV, and the oil-gas mixture is thrown back into the stationary structure assembly.

[0037] Specific embodiment 2: A high-speed shaft system with air-assisted sealing that does not require an external air source, wherein the high-speed rotor assembly 20 includes a gear shaft 21, a rear fulcrum bearing locking nut assembly 25, a shaft head flange 26, a shaft head flange locking nut 27 and two sets of bearing structures;

[0038] A gear is installed in the middle of the gear shaft 21, and a plurality of stirring ends 22 are provided on the gear spokes. The stirring ends 22 are convex or concave structures provided on the gear spokes, and the stirring ends 22 face the outlet of the air duct 30;

[0039] The front end of the gear shaft 21 passes through a set of bearing assemblies and the shaft head flange 26 in sequence and is fixed to the shaft head flange locking nut 27. The rear end of the gear shaft 21 passes through another set of bearing assemblies and is fixed to the rear fulcrum bearing locking nut 25. The two sets of bearing assemblies are used to support the gear shaft 21 to rotate along the two sets of bearing assemblies.

[0040] In this embodiment: the end of channel one is close to the wind-stirring structure of the high-speed rotor assembly. Since the linear velocity of the wind-stirring structure is relatively high, and the raised and recessed structures have a strong stirring and centrifugal effect on the nearby air, a negative pressure zone is formed in zone IV, and the oil-gas mixture is thrown back into the stationary structure assembly.

[0041] Other implementations are the same as the first specific implementation.

[0042] Specific embodiment three: a high-speed shafting system with air-assisted sealing that does not require an external air source, the bearing structure includes a bearing inner ring spacer ring 23 and two main shaft bearings 24;

[0043] The bearing inner ring spacer 23 and the two main shaft bearings 24 are both sleeved on the gear shaft 21 , and the bearing inner ring spacer 23 is located between the two main shaft bearings 24 .

[0044] Other implementations are the same as the second specific implementation.

[0045] Specific embodiment 4: A high-speed shafting system with air-assisted sealing that does not require an external air source, wherein the stationary structural assembly 10 includes a gearbox 18, a rear pivot bearing bushing 11, a rear pivot bearing outer ring pressure ring 12, a blind cover 13, a front pivot bearing bushing 15, a front pivot bearing outer ring pressure ring 16, and a non-contact sealing ring 17;

[0046] The front fulcrum bearing bushing 15 is fixed to the front end of the gear box 18. The front fulcrum bearing bushing 15 is sleeved on the outside of the front bearing structure. The front fulcrum bearing outer ring pressure ring 16 is arranged in the front fulcrum bearing bushing 15 and is located in front of the bearing structure. The non-contact sealing ring 17 is located in front of the front fulcrum bearing bushing 15 and is tightly attached to the front fulcrum bearing bushing 15. The rear end convex ring of the non-contact sealing ring 17 presses against the front fulcrum bearing outer ring pressure ring 16 and is inserted into the front fulcrum bearing bushing 15. An axial gap and a radial gap are left between the non-contact sealing ring 17 and the shaft head flange 26.

[0047] A second channel 15-1 is provided on the upper portion of the front pivot bearing bushing 15 and communicates with the adjacent first channel 30-1. A third channel 17-1 is provided on the non-contact sealing ring 17 and communicates with the second channel 15-1. The outlet end of the third channel 17-1 faces the radial gap between the non-contact sealing ring 17 and the shaft head flange 26.

[0048] The rear fulcrum bearing bushing 11 and the blind cover 13 are fixed to the rear end of the gear box 18 in sequence from front to back. The rear fulcrum bearing bushing 11 is sleeved on the outside of the bearing structure at the rear end. The rear fulcrum bearing outer ring pressure ring 12 is arranged in the rear fulcrum bearing bushing 11 and is located behind the bearing structure. The front end convex ring of the blind cover 13 presses against the rear fulcrum bearing outer ring pressure ring 12 and is inserted into the rear fulcrum bearing bushing 11.

[0049] A channel six 11-1 communicating with the adjacent channel one 30-1 is provided on the upper portion of the rear fulcrum bearing bushing 11, and a channel seven 13-1 communicating with the channel six 11-1 and the outside is provided on the cover 13.

[0050] In this embodiment, the front pivot bearing assembly near the shaft flange is restricted in axial movement by the clamping action of the shaft flange locking nut, the oil slinger, and the front pivot bearing outer ring pressure ring. The rear pivot bearing assembly is not axially limited and is axially movable as a whole, thereby accommodating the axial thermal expansion caused by high temperatures of the high-speed rotor. The shaft flange is axially advanced under the pressure of the shaft flange locking nut, achieving a high-precision connection with the gear shaft through a tapered fit. The outer diameter of the shaft flange is configured as a sealing surface, and the non-contact sealing ring forms a reliable non-contact seal with it, resulting in a compact shaft system.

[0051] Among them, the distance L2 between the shaft head flange and the nearby bearing group support point and L1 between the shaft head flange and the non-contact sealing ring are important design parameters: the V area between the shaft head flange and the non-contact seal forms a negative pressure area due to centrifugal force. The smaller L1 is, the more severe the centrifugal force is. Excessive L1 will compress the design space of sealing and oil return. In order to increase the critical speed of the high-speed rotor assembly, a reasonable L2 should be controlled. If L2 is too small, the design space of sealing and oil return will be further compressed.

[0052] Other implementations are the same as the third specific implementation.

[0053] Specific embodiment 5: A high-speed shaft system with air-assisted sealing that does not require an external air source, wherein a non-contact sealing ring 17 is provided with a channel 17-2 connecting a third channel 17-1 with the outside world;

[0054] The non-contact sealing ring 17 is provided with a channel 5 17 - 3 connecting the channel 3 17 - 1 with the outside, and a plug is connected to the channel 5 17 - 3 .

[0055] In this embodiment: a channel four connecting channel three with the outside world is provided on the non-contact sealing ring for air intake. In order to avoid the negative pressure of the V zone offsetting the air intake effect of the air duct, the ventilation air intake hole of the non-contact seal avoids facing the V zone.

[0056] The non-contact sealing ring is provided with a channel five communicating with the channel three and the outside for air intake.

[0057] Other implementations are the same as the fourth specific implementation.

[0058] Specific embodiment six: A high-speed shafting system with air-assisted sealing that does not require an external air source, wherein a bearing outer ring oil spray spacer 14 is provided between the two main shaft bearings 24 of each bearing structure, an oil groove is provided on the outer ring of the bearing outer ring oil spray spacer 14, and an oil port 15-3 provided on the front fulcrum bearing bushing 15 is provided at the bottom of the second channel 15-1. The second channel 15-1 is connected to the oil port 15-3, and the oil port 15-3 is located above the oil groove of the adjacent bearing outer ring oil spray spacer 14;

[0059] The bottom of channel six 11-1 is provided with an oil port two 11-3 arranged on the rear fulcrum bearing bushing 11, and channel six 11-1 is connected to the oil port two 11-3, and the oil port two 11-3 is located above the oil groove of the adjacent bearing outer ring oil spray spacer ring 14.

[0060] In this embodiment: by matching and grinding the bearing inner ring spacer and the bearing outer ring oil spray spacer, the four main shaft supporting bearings are paired in O-shape, and the oil groove of the bearing outer ring oil spray spacer enters the grease, and the grease enters channel six from channel one, and finally falls into the oil groove of the bearing outer ring oil spray spacer through oil port two.

[0061] The oil droplets generated in channel 2 drop along the oil port 1 to the space between the two bearings to participate in lubrication. The oil droplets generated in channel 6 drop along the oil port 2 to the space between the two bearings to participate in lubrication.

[0062] Other implementations are the same as the fifth specific implementation.

[0063] Specific embodiment seven: A high-speed shaft system with air-assisted sealing that does not require an external air source, wherein a notch 16-2 is provided at the front lower portion of the front pivot bearing outer ring pressure ring 16, and a channel 8 15-2 is provided at the lower portion of the front pivot bearing bushing 15 to connect the notch 16-2 with the interior space of the gear box 18;

[0064] A notch 2 12 - 1 is provided at the rear lower portion of the rear fulcrum bearing outer ring pressure ring 12 , and a channel 9 11 - 2 is provided at the lower portion of the rear fulcrum bearing bushing 11 to connect the notch 2 12 - 1 with the internal space of the gear box 18 .

[0065] In this embodiment, the grease overflowing from the front bearing assembly after lubrication flows along the gap one to the channel eight and returns to the bearing box, and the grease overflowing from the rear bearing assembly after lubrication flows along the gap two to the channel nine and returns to the bearing box.

[0066] Other implementations are the same as the sixth specific implementation.

[0067] Specific embodiment eight: A high-speed shaft system with air-assisted sealing that does not require an external air source, a non-contact sealing ring 17 is provided with a channel 17-4 connected to the channel 9 11-2, and the outlet end of the channel 17-4 faces the radial gap between the non-contact sealing ring 17 and the shaft head flange 26.

[0068] In this embodiment: Channel 10 is used to connect the radial gap between the non-contact sealing ring and the shaft head flange, so that the internal space of the bearing box is connected to the external environment, balancing the internal and external air pressures, and ensuring that condensed oil droplets can flow from top to bottom.

[0069] Other implementations are the same as the specific implementation method seven.

[0070] Specific embodiment nine: A high-speed shaft system with air-assisted sealing that does not require an external air source, an oil-slinging ring 28 that rotates synchronously with the gear shaft 21 is provided between the shaft head flange 26 and the adjacent bearing assembly, and the oil-slinging ring 28 is located in the front fulcrum bearing outer ring pressure ring 16, and an oil port three 16-1 is provided on the upper part of the front fulcrum bearing outer ring pressure ring 16, and an oil port four 15-4 corresponding to the oil port three 28-1 and connected to the channel two 15-1 is provided on the front fulcrum bearing bushing 15.

[0071] In this embodiment, the oil and gas droplets entering the oil port three fall on the oil slinger ring and are spun back into the bearing box through the oil port four and the channel eight.

[0072] Other implementations are the same as the eighth specific implementation.

[0073] Specific embodiment 9: A high-speed shaft system with air-assisted sealing that does not require an external air source. n oil return sieve holes 30 - 2 with a diameter of D are set at the lower part of the air duct 30. The oil return sieve holes 30 - 2 allow the droplets generated by the collected oil-gas mixture to flow back into the gearbox 18.

[0074] In this embodiment, the number n and diameter D of the holes are critical design parameters. The ventilation cross-section of the induced draft duct must not be larger than that of zones II and III, otherwise the oil and gas extraction from the oil return zone will be weakened. Furthermore, to prevent the negative pressure in zone V from offsetting the induced draft duct's air flow, the ventilation inlet holes in the non-contact seal should avoid facing zone V.

[0075] Working Principle: A ventilation path is designed on the bearing bushing, connecting an induced draft duct to the high-speed gear spokes where the linear velocity is higher. The gear spokes are designed with raised or recessed features to enhance centrifugal agitation. This, due to the Bernoulli principle, generates negative pressure in the induced draft duct, drawing the oil-air mixture from the seal chamber and oil return chamber into the bearing bushing. The induced draft duct is then directed to the high-speed gear spokes where the linear velocity is higher, where it is then ejected into the gearbox. To prevent oil-air condensation in the induced draft duct and subsequent backflow, a small oil return hole is provided at the lower end of the induced draft duct to prevent the backflow of condensed oil-air. This solution requires no modification to the established seal structure or special rotor design, is simple to manufacture and design, does not require an external air source for air-assisted sealing, and is adaptable to forward and reverse rotational operation. Compared to conventional induced draft non-contact seals, this reduces equipment cost and improves sealing effectiveness. This design represents a high-speed shafting system with simple manufacturing and design features that does not require an external air source for air-assisted sealing.

Claims

1. A high-speed shafting system with air-assisted sealing that does not require an external air source, characterized by: It includes a stationary structure assembly (10), a high-speed rotor assembly (20) and two induced draft ducts (30); A cavity is provided in the middle of the stationary structure component (10), and two air induction pipes (30) are fixed in the cavity symmetrically in front and back. A channel 1 (30-1) of each air induction pipe (30) is also connected to the outside of the stationary structure component (10). Both the front and rear ends of the high-speed rotor component (20) are connected to the stationary structure component (10), and the stirring end of the high-speed rotor component (20) is located between the two air induction pipes (30). The high-speed rotor assembly (20) includes a gear shaft (21); A gear is installed in the middle of the gear shaft (21), and a plurality of air stirring ends (22) are provided on the gear spokes. The air stirring ends (22) are convex structures or concave structures provided on the gear spokes, and the air stirring ends (22) face the outlet of the air duct (30); The stationary structural assembly (10) includes a gearbox (18), a rear pivot bearing bushing (11) and a front pivot bearing bushing (15); A ventilation air path is provided on the bearing bushing.

2. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 1, characterized in that: The high-speed rotor assembly (20) further includes a rear pivot bearing locking nut assembly (25), a shaft head flange (26), a shaft head flange locking nut (27) and two sets of bearing structures; The front end of the gear shaft (21) passes through a set of bearing assemblies and the shaft head flange (26) in sequence and is fixed with the shaft head flange locking nut (27). The rear end of the gear shaft (21) passes through another set of bearing assemblies and is fixed with the rear fulcrum bearing locking nut. The two sets of bearing assemblies are used to support the gear shaft (21) to rotate along the two sets of bearing assemblies.

3. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 2, characterized in that: The bearing structure includes a bearing inner ring spacer (23) and two main shaft bearings (24); The bearing inner ring spacer (23) and the two main shaft bearings (24) are both sleeved on the gear shaft (21), and the bearing inner ring spacer (23) is located between the two main shaft bearings (24).

4. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 3, characterized in that: The stationary structural assembly (10) further includes a rear pivot bearing outer ring pressure ring (12), a cover (13), a front pivot bearing outer ring pressure ring (16), and a non-contact sealing ring (17); The front pivot bearing bushing (15) is fixed to the front end of the gear box (18), the front pivot bearing bushing (15) is sleeved on the outside of the front bearing structure, the front pivot bearing outer ring pressure ring (16) is arranged in the front pivot bearing bushing (15) and is located in front of the bearing structure, the non-contact sealing ring (17) is located in front of the front pivot bearing bushing (15) and is closely attached to the front pivot bearing bushing (15), the rear end convex ring of the non-contact sealing ring (17) presses against the front pivot bearing outer ring pressure ring (16) and is inserted into the front pivot bearing bushing (15); an axial gap and a radial gap are left between the non-contact sealing ring (17) and the shaft head flange (26); A second channel (15-1) communicating with the adjacent first channel (30-1) is provided on the upper portion of the front pivot bearing bushing (15), and a third channel (17-1) communicating with the second channel (15-1) is provided on the non-contact sealing ring (17), wherein the outlet end of the third channel (17-1) faces the radial gap between the non-contact sealing ring (17) and the shaft head flange (26); The rear pivot bearing bushing (11) and the blind cover (13) are fixed to the rear end of the gear box (18) in sequence from front to back, the rear pivot bearing bushing (11) is sleeved on the outside of the bearing structure at the rear end, the rear pivot bearing outer ring pressure ring (12) is arranged in the rear pivot bearing bushing (11) and is located behind the bearing structure, and the front end convex ring of the blind cover (13) presses against the rear pivot bearing outer ring pressure ring (12) and is inserted into the rear pivot bearing bushing (11); The upper portion of the rear fulcrum bearing bushing (11) is provided with a channel six (11-1) communicating with the adjacent channel one (30-1), and the cover (13) is provided with a channel seven (13-1) communicating with the channel six (11-1) and the outside world.

5. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 4, characterized in that: The non-contact sealing ring (17) is provided with a fourth channel (17-2) connecting the third channel (17-1) with the outside world; The non-contact sealing ring (17) is provided with a channel five (17-3) communicating the channel three (17-1) with the outside world, and a plug is connected to the channel five (17-3).

6. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 5, characterized in that: A bearing outer ring oil spray spacer (14) is provided between the two main shaft bearings (24) of each bearing structure, an oil groove is left on the outer ring of the bearing outer ring oil spray spacer (14), an oil port 1 (15-3) provided on the front support bearing bushing (15) is provided at the bottom of the second channel (15-1), the second channel (15-1) is communicated with the oil port 1 (15-3), and the oil port 1 (15-3) is located above the oil groove of the adjacent bearing outer ring oil spray spacer (14); The bottom of channel six (11-1) is provided with an oil port two (11-3) arranged on the rear fulcrum bearing bushing (11), channel six (11-1) is communicated with oil port two (11-3), and oil port two (11-3) is located above the oil groove of the adjacent bearing outer ring oil spray spacer ring (14).

7. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 6, characterized in that: A notch 1 (16-2) is provided at the front lower portion of the front fulcrum bearing outer ring pressure ring (16), and a channel 8 (15-2) is provided at the lower portion of the front fulcrum bearing bushing (15) for connecting the notch 1 (16-2) with the inner space of the gear box (18); A notch 2 (12-1) is provided at the rear lower portion of the rear pivot bearing outer ring pressure ring (12), and a channel 9 (11-2) is provided at the lower portion of the rear pivot bearing bushing (11) for connecting the notch 2 (12-1) with the internal space of the gear box (18).

8. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 7, characterized in that: The non-contact sealing ring (17) is provided with a channel ten (17-4) communicating with the channel nine (11-2), and the outlet end of the channel ten (17-4) faces the radial gap between the non-contact sealing ring (17) and the shaft head flange (26).

9. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 8, characterized in that: An oil slinger (28) is provided between the shaft head flange (26) and the adjacent bearing assembly, and rotates synchronously with the gear shaft (21). The oil slinger (28) is located inside the front pivot bearing outer ring pressure ring (16). An oil port three (16-1) is provided on the upper portion of the front pivot bearing outer ring pressure ring (16). An oil port four (15-4) corresponding to the oil port three (28-1) and connected to the channel two (15-1) is provided on the front pivot bearing bushing (15).

10. The high-speed shafting system with air-assisted sealing that does not require an external air source according to claim 8, characterized in that: N oil return sieve holes (30-2) with a diameter of D are provided at the lower part of the induced draft pipe (30), and the oil return sieve holes (30-2) allow droplets generated by the collected oil-gas mixture to flow back into the gear box (18).

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