Rotor system, micro gas turbine generator set and deicing method

Abstract

The present invention provides a rotor system, a micro-gas turbine generator set, and a deicing method. The rotor system includes a rotating shaft, which is an integrally formed structure; bearings, a motor, a compressor, and a turbine are mounted on the rotating shaft; the bearings are all air bearings made of conductive materials, and the air shafts are connected to a power source and a switch; and a water absorption chamber is provided near the air inlet of the air bearing, filled with a water absorbent. This invention can solve the technical problem of water accumulation in the air bearings used in the rotor system and micro-gas turbine generator set, and the throttle orifices thereof are prone to ice formation.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a rotor system, a micro gas turbine generator set and a deicing method. Background Art

[0002] Air bearings (also known as air flotation bearings) use gas (usually air, but other gases are possible) as a lubricant. They utilize a contactless bearing system, supplying radial air to the bearing gap through an orifice. This creates a lubricating film with a certain load-bearing and rigidity, thereby reducing the impact of friction on the motor shaft speed. The main advantages of air bearings are as follows: low viscosity of the gas lubricant, resulting in low friction and wear, high rotational accuracy, and low power consumption; gas bearings offer a wide operating range and low pollution; and they offer a long life while maintaining accuracy. However, at low temperatures, water in the orifice of an air bearing can frost or even freeze, preventing static air from entering the gap between the bearing and the rotor. Starting the system with static flotation inoperative can cause devastating and irreparable damage to the rotor and bearings. However, rotor systems often cannot self-check the orifice ventilation status, forcing them to resort to passive and inefficient methods such as delayed or slow start. In fact, if the orifice is completely frozen, the persistent low ambient temperature makes delayed or slow start ineffective.

[0003] Furthermore, when air bearings are used in micro gas turbines, the high-pressure gas discharged from the compressor absorbs heat during decompression, condensing water vapor in the air into water that adheres to the bearings. Water in the bearings can easily cause the bearings and rotor to rust, affecting their operation. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a rotor system, a micro gas turbine generator set and a deicing method, which can solve the technical problems that water exists in the air bearings used in the rotor system and the micro gas turbine generator set and the throttle holes thereof are easily frozen.

[0005] The technical solutions of the present invention are as follows:

[0006] According to one aspect of the present invention, there is provided a rotor system, comprising:

[0007] A rotating shaft, wherein the rotating shaft is an integrally formed structure;

[0008] The rotating shaft is provided with bearings, a motor, a compressor and a turbine;

[0009] The bearing comprises an air bearing made of a conductive material, and the air bearing is connected to a power source and a switch;

[0010] A water absorption cavity is provided at a position close to the air inlet of the air bearing, and the water absorption cavity is filled with a water absorbing agent.

[0011] Furthermore, wires are provided at both ends of the air bearing, and ends of the wires are connected to a power source and a switch, respectively, and the power source and the switch are connected via wires.

[0012] Furthermore, the water absorbent is a fabric made of super absorbent fibers, a super absorbent resin, or a desiccant particle net bag.

[0013] Furthermore, the conductor material is aluminum or copper; and the power supply is a 12V external power supply.

[0014] Furthermore, the rotating shaft includes an integrally formed first shaft segment and a second shaft segment, the diameter of the first shaft segment is larger than the diameter of the second shaft segment, and a step surface is formed at the transition between the first shaft segment and the second shaft segment;

[0015] The air bearing includes a thrust bearing, a first radial bearing, and a second radial bearing. The thrust bearing, the first radial bearing, and the motor are arranged on the first shaft segment. The compressor, the second radial bearing, and the turbine are arranged on the second shaft segment. One end of the compressor abuts against the step surface.

[0016] Alternatively, the air bearing includes an integrated bearing and a second radial bearing, the integrated bearing and the motor are arranged on the first shaft segment, the compressor, the second radial bearing and the turbine are arranged on the second shaft segment, and one end of the compressor abuts against the step surface.

[0017] Furthermore, a reinforcement ring is provided between the compressor and the turbine;

[0018] A support portion is provided in the middle of the inner wall of the reinforcement ring to abut against the rotating shaft, and the inner wall of the reinforcement ring is located on both sides of the support portion and is arched;

[0019] Alternatively, the reinforcement ring comprises a cylindrical barrel and a radial limiting ring provided on the outer side of the barrel wall, wherein both ends of the cylindrical barrel are embedded in the grooves of the compressor and turbine end faces, and the radial limiting ring is clamped on the compressor or turbine end face;

[0020] Alternatively, the reinforcement ring is formed integrally with the compressor or turbine.

[0021] According to another aspect of the present invention, there is provided a micro gas turbine generator set comprising a motor casing, a gas turbine casing, a combustion chamber and the above-mentioned rotor system;

[0022] The motor casing cover is arranged on the outer periphery of the motor, and the gas turbine casing cover is arranged on the outer periphery of the compressor and the turbine, and is connected to the motor casing;

[0023] The combustion chamber is connected to the gas turbine casing, and the air inlet of the combustion chamber is connected to the exhaust port of the compressor, and the exhaust port of the combustion chamber is connected to the air inlet of the turbine.

[0024] According to another aspect of the present invention, a deicing method is provided, which is used for waterproofing and deicing the air bearings in the above-mentioned rotor system or the above-mentioned micro gas turbine generator set, and the method comprises:

[0025] 1) Close the switch connected to the air bearing to form a short circuit and open the switch after a certain period of time;

[0026] 2) Ventilate the air inlet of the air bearing to blow out the melted water;

[0027] Repeat steps 1) and 2) above until the ice is completely removed.

[0028] Furthermore, in step 1), before closing the switch connected to the air bearing, the air bearing is preheated using high-temperature air pumped out by an air pump.

[0029] Furthermore, after de-icing, the rotor system is started and the air bearing is turned on to detect whether the shaft is in a suspended state, including:

[0030] A servo is provided, and the servo is used to receive a control command to lower a conductive device to contact the rotating shaft when the bearing suspension state needs to be detected, and the bearing to be tested and the rotating shaft are connected in series to an electric circuit through the conductive device;

[0031] Start the shaft and the air bearing to be tested. If the power circuit is not conductive, the shaft is determined to be in a suspended state. If the power circuit is conductive, further determine whether the suspension is falsely unsuccessful due to residual water from de-icing.

[0032] The method for determining whether the false unsuccessful suspension is caused by residual water from de-icing includes:

[0033] The shaft is driven to rotate at a low speed with a pre-calibrated extremely small torque, and the corresponding torque and speed are detected and checked. If the speed reaches the calibration value corresponding to the calibrated torque, the shaft is determined to be in a suspended state, otherwise it is determined that the shaft is not suspended.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. In the rotor system of the present invention, the air bearing used is provided with corresponding waterproof and de-icing structures, which can avoid the phenomenon of reduced bearing life and difficulty in normal operation caused by water in the air bearing and easy freezing of the throttle hole.

[0036] 2. The gas turbine generator set structure of the present invention uses an air bearing with a waterproof and deicing structure, which can solve the technical problem of water in the bearing and the throttle hole being easily frozen, thereby increasing the service life of the gas turbine generator set and ensuring the stable operation of the gas turbine generator set.

[0037] 3. The waterproofing and deicing method provided by the present invention can complete deicing in the air bearing in a very short time, and has the advantages of high efficiency and low cost.

[0038] 4. The waterproofing and deicing method provided by the present invention can detect whether the rotor is normally suspended after deicing, so as to ensure the normal and stable operation of the rotor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a structural schematic diagram of the rotor system and micro gas turbine generator set provided by an embodiment of the present invention.

[0040] Figure 2 For the present invention Figure 1 A partial enlarged view of position C in the figure.

[0041] Figure 3 For the present invention Figure 1 A local enlarged view of position D in the figure. DETAILED DESCRIPTION

[0042] In order to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0043] According to one aspect of the present invention, an embodiment of the present invention provides a rotor system.

[0044] like Figure 1 As shown, it includes a rotating shaft 100, which includes an integrally formed first shaft segment 110 and a second shaft segment 120. The diameter of the first shaft segment 110 is larger than the diameter of the second shaft segment 120, and a stepped surface 130 is formed at the transition between the first shaft segment 110 and the second shaft segment 120. The integrated bearing and the motor 300 are sequentially disposed on the first shaft segment 110, and the compressor 500, the second radial bearing 400, and the turbine 600 are sequentially disposed on the second shaft segment 120, with one end of the compressor 500 abutting against the stepped surface 130. In the rotor system of this embodiment, the rotating shaft 100 is supported by bearings at both ends (the integrated bearing and the second radial bearing 400), which provides uniform force and avoids weight imbalance caused by the overhanging rotor shaft end.

[0045] It should be understood that this embodiment is merely an example of a rotor system structure provided by the present invention and does not constitute a limitation on the rotor system of the present invention. The integrated bearing in this embodiment can also be replaced with a split bearing, that is, a thrust bearing and a first radial bearing. Similarly, the bearings provided on the rotating shaft, the motor 300, the compressor 500, and the turbine can also adopt other layouts.

[0046] In this embodiment, both the integrated bearing (or the thrust bearing and the first radial bearing) and the second radial bearing 400 utilize air bearings, which can be either hydrostatic or hybrid. To address the issue of moisture within the bearings, this embodiment provides a water absorption chamber 850 near the bearing air inlet. This chamber is filled with a desiccant, such as a fabric made of superabsorbent fibers, a superabsorbent resin, or a mesh bag containing similar desiccant particles. This desiccant filters moisture from the air entering the bearings, ensuring a dry air supply.

[0047] The above radial bearings are annular, see Figure 3 An annular air cavity is provided on its outer wall, and the bottom of the annular air cavity is connected to the gap between the inner wall of the bearing and the rotating shaft through a throttle hole. An air inlet is provided to connect the air inlet of the annular air cavity, and the water absorption cavity 850 is opened in the installation space around the bearing near the air inlet of the annular air cavity.

[0048] For the above thrust bearings, see Figure 2 The thrust part of the integrated bearing shown includes a first bearing body and a second bearing body arranged opposite to each other. The first bearing body is a circular ring and a first annular air cavity is arranged on the outer end face; the second bearing body is a stepped ring and includes a circumferential wall and an end wall, and a second annular air cavity is arranged on the outer end face of the end wall. The circumferential wall covers the outer periphery and end of the thrust plate, and the first bearing body covers the other end of the thrust plate; an air inlet is arranged on the circumferential wall of the second bearing body, and the air inlet is connected to the first annular air cavity and the second annular air cavity through a throttle hole.

[0049] In this embodiment, both the integrated bearing and the second radial bearing 400 are made of conductive materials, typically aluminum or copper. To address the issue of water vapor freezing and clogging the orifice, this embodiment connects both the integrated bearing and the second radial bearing 400 to a power source 860 and a switch 870. When the bearings are powered by a 12V external power source, they create a near-short-circuit resistor, generating a significant amount of heat in a very short period of time, melting frost and even evaporating any remaining water, achieving effective and cost-effective de-icing.

[0050] As a preference, Figure 1As shown, wires are installed at both ends of the integrated bearing. The ends of the wires pass through the gas turbine casing and are connected to a power supply 860 and a switch 870, respectively. A wire connection is provided between the power supply 860 and the switch 870. Wires are installed at both ends of the second radial bearing 400. The ends of the wires pass through the gas turbine casing and are connected to a power supply 860 and a switch 870, respectively. A wire connection is provided between the power supply 860 and the switch 870. To de-ice, switches 870 are closed to form a short circuit and then opened. The air inlets of the integrated bearing and the second radial bearing 400 are then ventilated to blow out the melted water.

[0051] In this embodiment, the one-piece bearing is an integrated air bearing, which has both radial support and axial support functions.

[0052] like Figure 1 、 2 As shown, the integrated bearing includes: a first bearing body, a thrust plate, and a second bearing body; the thrust plate is fixedly connected to the rotating shaft 100 or integrally formed; the first bearing body and the second bearing body are both sleeved on the rotating shaft and located on both sides of the thrust plate; the first bearing body has an integrally formed radial bearing portion 900 and a thrust bearing portion 200, the radial bearing portion 900 and the rotating shaft 100 having a predetermined radial clearance in the radial direction, the thrust bearing portion 200 and the thrust plate are axially opposed and have a predetermined first axial clearance; the second bearing body and the thrust plate are axially opposed and have a predetermined second axial clearance. The integrated bearing of this embodiment also includes a bearing housing and a bearing end cap, the bearing housing being disposed around the outer periphery of the first bearing body, the thrust plate, and the second bearing body, and the bearing end cap being mounted on one end of the second bearing body of the rotating shaft 100, fixing the second bearing body in the axial direction and transitionally fitting with the bearing housing.

[0053] Since the first bearing body in this embodiment includes both the radial bearing portion 900 and the thrust bearing portion 200, it is sufficient to machine the thrust bearing portion 200 with the axial direction as the reference, ensuring perpendicularity between the axial direction and the active surface of the thrust bearing portion 200, or to machine the inner diameter of the radial bearing portion 900 with the active surface of the thrust bearing portion 200 as the reference, ensuring perpendicularity between the active surface of the thrust bearing portion 200 and the axial direction. This results in a simple and easy machining process with high machining precision. Furthermore, the assembly process does not require consideration of assembly precision, simplifying the assembly process.

[0054] Preferably, a first air inlet duct P1 is provided on the thrust bearing 200 and the motor 300. The first air inlet duct P1 on the thrust bearing 200 is disposed opposite the first air inlet duct P1 on the motor 300 and communicates with the air inlet of the compressor 500. This not only facilitates the air inlet flow to the compressor 500 but also allows the air inlet to cool the stator windings of the motor 300.

[0055] Preferably, a second air intake duct P2 can be provided between the motor stator and the motor housing of motor 300. In case of high air intake demand, both air intake ducts (i.e., first air intake duct P1 and second air intake duct P2) can simultaneously intake air. This ensures sufficient air intake for compressor 500 and further cools the motor housing, stator, and stator windings.

[0056] In the rotor system, the lighter the shaft 100, the better. The smaller the diameter of the shaft 100, the lighter the weight. However, during high-speed rotation of the rotor system, the strength of the shaft 100 is highly demanded. To consider both the rotor dynamics and the strength of the shaft 100, the diameter of the second shaft section 120 can be set to be smaller, and a reinforcement ring 700 can be fixedly installed between the compressor 500 and the turbine 600. Figure 3 To meet the requirements for rotor stiffness, the reinforcement ring 700 can serve as the mounting shaft for the second radial bearing 400. The second radial bearing 400 is sleeved on the reinforcement ring 700; an annular air cavity is provided on the second radial bearing 400, and the annular air cavity is supplied with air from the air inlet on the gas turbine stator. Figure 3 A support portion is provided in the middle of the inner wall of the reinforcement ring 700 to rest against the rotating shaft 100, and the inner wall of the reinforcement ring 700 is located on both sides of the support portion and is arched to meet the stress requirements; or the reinforcement ring 700 includes a cylindrical tube and a radial limit ring provided on the outer side of the tube wall, and the two ends of the cylindrical tube are embedded in the end face grooves of the compressor 500 and the turbine 600, and the radial limit ring is clamped on the end face of the compressor 500 or the turbine 600; or the reinforcement ring 700 is integrally formed with the compressor 500 or the turbine 600.

[0057] The rotor system of the present invention can be applied to a generator set with or without a regenerator.

[0058] According to another aspect of the present invention, an embodiment of the present invention further provides a micro gas turbine generator set using the above rotor system, the generator set comprising:

[0059] The above-mentioned rotor system includes a motor casing 810, a gas turbine casing 820 and a combustion chamber 830; the motor casing 810 is covered on the outer periphery of the motor 300, and the gas turbine casing 820 is covered on the outer periphery of the compressor 500 and the turbine 600, and is connected to the motor casing 810, and the combustion chamber 830 is connected to the gas turbine casing 820, and the air inlet of the combustion chamber 830 is connected to the exhaust port of the compressor 500, and the exhaust port of the combustion chamber 830 is connected to the air inlet of the turbine 600.

[0060] Preferably, a diffuser 840 is provided between the exhaust port of the compressor 500 and the air inlet of the combustion chamber 830 to further increase the pressure of the high-temperature and high-pressure gas entering the turbine 600 to perform work.

[0061] In the micro gas turbine generator set of this embodiment, the bearing is disposed within the motor casing 810. This requires only the machining accuracy of the portion of the casing used to mount the bearing stator. During assembly, the portion of the casing used to connect the bearing stator can be completed through a single clamping process. This reduces the machining and assembly accuracy of the gas turbine generator set, reduces costs, and is suitable for engineering-based mass production. Furthermore, the gas turbine generator set of the present invention has sufficient air intake. Because the two fulcrums are located at both ends of the rotating shaft 100, the axially adjustable range of the rotating shaft 100 is relatively large, the rotating shaft is evenly stressed, and the gas turbine generator set operates smoothly. Furthermore, in this embodiment, the air bearings used are all provided with waterproof and de-icing structures, which can solve the problem of water in the bearings and the throttle holes being easily frozen.

[0062] According to another aspect of the present invention, an embodiment of the present invention further provides a deicing method for air bearings in the above-mentioned rotor system and micro gas turbine generator set.

[0063] The deicing method provided in the embodiment of the present invention includes the following steps:

[0064] Step 110: Detect whether there is ice on the throttle hole of the air bearing.

[0065] Specifically, a temperature and humidity sensor can be set to measure the temperature and humidity of the system working environment. When the temperature and humidity values ​​reach certain limits, it can be considered that ice is present in the bearing throttle hole.

[0066] Step 120: If it is determined that icing exists, start the de-icing device to remove ice from the throttle hole.

[0067] There are two optional de-icing methods.

[0068] Method 1: Compressed air is typically very hot, usually above 100°C. Use an air source (such as an external air compressor or air pump) to deliver an appropriate amount of compressed air to preheat the bearing. The ice quickly melts into water, which is then expelled from the orifice under the influence of the compressed air. This method can be used to de-ice static air bearings using an external air source. The advantage of this method is that it eliminates the need for additional de-icing equipment, reduces costs, and improves the efficiency of the air source.

[0069] Method 2: Bearings are typically made of conductors such as aluminum or copper. Connecting a 12V external power supply 860 to the bearings creates a near-short-circuit resistor, generating a significant amount of heat in a very short period of time, melting the frost and even evaporating any remaining water. Specifically, to de-ice, the switches 870 connected to the air bearings are closed to create a short circuit, then opened. Air is then ventilated to the air inlet of the air bearings to blow out the melted water.

[0070] Both methods are very effective and cost-effective for deicing, with only slight differences in speed. Therefore, to ensure effective deicing, pre-deicing can be performed by blowing air before powering on.

[0071] Step 130 : Start the rotor system and open the air bearing to detect whether the rotor (ie, the shaft 100 ) is in a suspended state.

[0072] There are two optional detection methods.

[0073] Method 1: When the bearings in the rotor system include a thrust bearing (magnetic bearing or gas-magnetic hybrid bearing) and a radial bearing to be tested, the thrust bearing and the radial bearing to be tested are connected in series on an energized circuit. Turn on the magnetic bearing to attract the rotor, move the rotor to one end of the thrust bearing, and make contact between the thrust bearing-thrust disk-rotor. If the rotor and the radial bearing are in contact at this time (indicating that the rotor has not been successfully suspended), the energized circuit will be conductive. On the contrary, if the circuit is not conductive, it means that the bearing has formed a stable static pressure air film to support the rotor, that is, the rotor has been successfully suspended. Whether the energized circuit is conductive can be detected by setting a detection circuit, and the present invention does not impose specific restrictions on the form of the detection circuit. For example, a detection circuit can be set to measure the resistance of the rotor and the radial bearing to be tested. When the energized circuit is conductive, that is, when the rotor and the radial bearing to be tested are in contact, the resistance measured by the detection circuit is 0 or a minimum value. For another example, a detection circuit can be set up to measure the current flowing through the rotor and the radial bearing under test. When the power circuit is on, that is, when the rotor and the radial bearing under test are in contact, the current measured by the detection circuit is non-zero. This method is suitable for testing radial bearings in systems that use magnetic bearings for thrust bearings.

[0074] Method 2: A servo is provided, which is used to receive a control command to lower a conductive device to contact the rotor when the rotor suspension state needs to be detected. In this way, the bearing to be tested and the rotor are connected in series to an electric circuit through the conductive device. Start the rotor and turn on the bearing to be tested. If there is contact between the rotor and the bearing to be tested (indicating that the rotor has not been successfully suspended), the electric circuit will be conductive. On the contrary, if the circuit is not conductive, it means that the bearing has formed a stable static pressure air film to support the rotor, that is, the rotor has been successfully suspended. Whether the power circuit is conductive can be detected by setting a detection circuit. The present invention does not impose specific restrictions on the form of the detection circuit. For example, the detection circuit can be set to measure the resistance of the rotor and the bearing to be tested. When the power circuit is conductive, that is, the rotor and the bearing to be tested are in contact, the resistance measured by the detection circuit is 0 or a minimum value. For another example, the detection circuit can be set to measure the current flowing through the rotor and the bearing to be tested. When the power circuit is conductive, that is, the rotor and the radial bearing to be tested are in contact, the current measured by the detection circuit is not zero. The conductive device can be any conductive material, such as a copper sheet or a conductive thimble. This solution can be used to detect both thrust bearings and radial bearings.

[0075] It should be noted that the two detection methods in step 130 are not limited to detecting the rotor suspension state in bearing antifreeze methods. In other embodiments, methods 1 and 2 in step 130 can be used to detect the rotor suspension state before gas turbine startup in any situation, and can also be used to detect contact collisions between the rotor and bearings due to system instability during gas turbine operation.

[0076] Step 140: If the detection result shows that the rotor is not successfully suspended, further confirm whether it is a false failure of suspension caused by residual water from de-icing.

[0077] When the ice melts, water will remain between the bearing and the rotor, which can easily form a passage between the bearing and the rotor, causing step 130 to mistakenly believe that the rotor has not been successfully suspended. That is, the rotor has actually floated, but the water has formed an electrical connection between the rotor and the bearing. Usually, continuous blowing can blow away the water, but it is not completely reliable. Therefore, on this basis, the motor is controlled to drive the rotor to rotate at a low speed with a very small torque that has been calibrated in advance, and the corresponding torque and speed are detected and checked. If the speed can reach the calibration value corresponding to the calibrated torque, it means that the bearing has been floated, that is, the unsuccessful suspension of the rotor detected in step 130 is actually a false failure to float caused by residual water from de-icing. If the rotor fails to rotate or the speed can reach the calibration value corresponding to the calibrated torque, it means that the floatation has failed. It is necessary to troubleshoot the rotor and bearings.

[0078] The bearing waterproofing and deicing method provided in the embodiment of the present invention can not only quickly de-ice the air bearing, but also detect the rotor system after de-icing, so as to timely eliminate potential faults and ensure the stable operation of the rotor system.

[0079] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, the above-mentioned features may have similar functions to (but not limited to) those disclosed in this application.

Claims

1. A deicing method for waterproofing and deicing air bearings in a rotor system, characterized in that: Rotor system, including: A rotating shaft, wherein the rotating shaft is an integrally formed structure; The rotating shaft is provided with bearings, a motor, a compressor and a turbine; The bearing comprises an air bearing made of a conductive material, and the air bearing is connected to a power source and a switch; A water absorption cavity is provided near the air inlet of the air bearing, and the water absorption cavity is filled with a water absorbing agent; The method comprises the following steps: 1) Close the switch connected to the air bearing to form a short circuit and open the switch after a certain period of time; 2) Ventilate the air inlet of the air bearing to blow out the melted water; Repeat steps 1) and 2) above until the ice is completely removed; After de-icing, start the rotor system and open the air bearing to detect whether the shaft is in a suspended state, including: A servo is provided, and the servo is used to receive a control command to lower a conductive device to contact the rotating shaft when the bearing suspension state needs to be detected, and the bearing to be tested and the rotating shaft are connected in series to an electric circuit through the conductive device; Start the shaft and the air bearing to be tested. If the power circuit is not conductive, the shaft is determined to be in a suspended state. If the power circuit is conductive, further determine whether the suspension is falsely unsuccessful due to residual water from de-icing. The method for determining whether the false unsuccessful suspension is caused by residual water from de-icing includes: The shaft is driven to rotate at a low speed with a pre-calibrated extremely small torque, and the corresponding torque and speed are detected and checked. If the speed reaches the calibration value corresponding to the calibrated torque, the shaft is determined to be in a suspended state, otherwise it is determined that the shaft is not suspended.

2. The deicing method according to claim 1, characterized in that: Step 1) Before closing the switch connected to the air bearing, use high-temperature air from an air pump to preheat the air bearing.

3. The deicing method according to claim 1, wherein: Wires are respectively provided at both ends of the air bearing, and ends of the wires are respectively connected to a power source and a switch, and the power source and the switch are connected via the wires.

4. The deicing method according to claim 1, wherein: The water absorbent is a fabric made of super absorbent fiber, a super absorbent resin or a desiccant particle net bag.

5. The deicing method according to claim 1, wherein: The conductor material is aluminum or copper; the power supply is a 12V external power supply.

6. The deicing method according to claim 1, wherein: The rotating shaft comprises an integrally formed first shaft section and a second shaft section, the diameter of the first shaft section is larger than the diameter of the second shaft section, and a step surface is formed at the transition between the first shaft section and the second shaft section; The air bearing includes a thrust bearing, a first radial bearing, and a second radial bearing. The thrust bearing, the first radial bearing, and the motor are arranged on the first shaft segment. The compressor, the second radial bearing, and the turbine are arranged on the second shaft segment. One end of the compressor abuts against the step surface. Alternatively, the air bearing includes an integrated bearing and a second radial bearing, the integrated bearing and the motor are arranged on the first shaft segment, the compressor, the second radial bearing and the turbine are arranged on the second shaft segment, and one end of the compressor abuts against the step surface.

7. The deicing method according to claim 1, characterized in that: A reinforcement ring is provided between the compressor and the turbine; A support portion is provided in the middle of the inner wall of the reinforcement ring to abut against the rotating shaft, and the inner wall of the reinforcement ring is located on both sides of the support portion and is arched; Alternatively, the reinforcement ring includes a cylindrical barrel and a radial limiting ring provided on the outer side of the barrel wall, wherein both ends of the cylindrical barrel are embedded in the grooves of the compressor and turbine end faces, and the radial limiting ring is clamped on the compressor or turbine end face; Alternatively, the reinforcement ring is formed integrally with the compressor or turbine.

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